net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27 #define NFT_SET_MAX_ANONLEN 16
  28
  29 unsigned int nf_tables_net_id __read_mostly;
  30
  31 static LIST_HEAD(nf_tables_expressions);
  32 static LIST_HEAD(nf_tables_objects);
  33 static LIST_HEAD(nf_tables_flowtables);
  34 static LIST_HEAD(nf_tables_destroy_list);
  35 static LIST_HEAD(nf_tables_gc_list);
  36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
  38
  39 enum {
  40         NFT_VALIDATE_SKIP       = 0,
  41         NFT_VALIDATE_NEED,
  42         NFT_VALIDATE_DO,
  43 };
  44
  45 static struct rhltable nft_objname_ht;
  46
  47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  50
  51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  54
  55 static const struct rhashtable_params nft_chain_ht_params = {
  56         .head_offset            = offsetof(struct nft_chain, rhlhead),
  57         .key_offset             = offsetof(struct nft_chain, name),
  58         .hashfn                 = nft_chain_hash,
  59         .obj_hashfn             = nft_chain_hash_obj,
  60         .obj_cmpfn              = nft_chain_hash_cmp,
  61         .automatic_shrinking    = true,
  62 };
  63
  64 static const struct rhashtable_params nft_objname_ht_params = {
  65         .head_offset            = offsetof(struct nft_object, rhlhead),
  66         .key_offset             = offsetof(struct nft_object, key),
  67         .hashfn                 = nft_objname_hash,
  68         .obj_hashfn             = nft_objname_hash_obj,
  69         .obj_cmpfn              = nft_objname_hash_cmp,
  70         .automatic_shrinking    = true,
  71 };
  72
  73 struct nft_audit_data {
  74         struct nft_table *table;
  75         int entries;
  76         int op;
  77         struct list_head list;
  78 };
  79
  80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  81         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  82         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  84         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  85         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  87         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  88         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  90         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  91         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  93         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  94         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  96         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  97         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
 100         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
 101         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 102         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 103         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 104         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 105         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 106         [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
 107 };
 108
 109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 110 {
 111         switch (table->validate_state) {
 112         case NFT_VALIDATE_SKIP:
 113                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 114                 break;
 115         case NFT_VALIDATE_NEED:
 116                 break;
 117         case NFT_VALIDATE_DO:
 118                 if (new_validate_state == NFT_VALIDATE_NEED)
 119                         return;
 120         }
 121
 122         table->validate_state = new_validate_state;
 123 }
 124 static void nf_tables_trans_destroy_work(struct work_struct *w);
 125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 126
 127 static void nft_trans_gc_work(struct work_struct *work);
 128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
 129
 130 static void nft_ctx_init(struct nft_ctx *ctx,
 131                          struct net *net,
 132                          const struct sk_buff *skb,
 133                          const struct nlmsghdr *nlh,
 134                          u8 family,
 135                          struct nft_table *table,
 136                          struct nft_chain *chain,
 137                          const struct nlattr * const *nla)
 138 {
 139         ctx->net        = net;
 140         ctx->family     = family;
 141         ctx->level      = 0;
 142         ctx->table      = table;
 143         ctx->chain      = chain;
 144         ctx->nla        = nla;
 145         ctx->portid     = NETLINK_CB(skb).portid;
 146         ctx->report     = nlmsg_report(nlh);
 147         ctx->flags      = nlh->nlmsg_flags;
 148         ctx->seq        = nlh->nlmsg_seq;
 149 }
 150
 151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 152                                              int msg_type, u32 size, gfp_t gfp)
 153 {
 154         struct nft_trans *trans;
 155
 156         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 157         if (trans == NULL)
 158                 return NULL;
 159
 160         INIT_LIST_HEAD(&trans->list);
 161         INIT_LIST_HEAD(&trans->binding_list);
 162         trans->msg_type = msg_type;
 163         trans->ctx      = *ctx;
 164
 165         return trans;
 166 }
 167
 168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 169                                          int msg_type, u32 size)
 170 {
 171         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 172 }
 173
 174 static void nft_trans_list_del(struct nft_trans *trans)
 175 {
 176         list_del(&trans->list);
 177         list_del(&trans->binding_list);
 178 }
 179
 180 static void nft_trans_destroy(struct nft_trans *trans)
 181 {
 182         nft_trans_list_del(trans);
 183         kfree(trans);
 184 }
 185
 186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 187                                  bool bind)
 188 {
 189         struct nftables_pernet *nft_net;
 190         struct net *net = ctx->net;
 191         struct nft_trans *trans;
 192
 193         if (!nft_set_is_anonymous(set))
 194                 return;
 195
 196         nft_net = nft_pernet(net);
 197         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 198                 switch (trans->msg_type) {
 199                 case NFT_MSG_NEWSET:
 200                         if (nft_trans_set(trans) == set)
 201                                 nft_trans_set_bound(trans) = bind;
 202                         break;
 203                 case NFT_MSG_NEWSETELEM:
 204                         if (nft_trans_elem_set(trans) == set)
 205                                 nft_trans_elem_set_bound(trans) = bind;
 206                         break;
 207                 }
 208         }
 209 }
 210
 211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 212 {
 213         return __nft_set_trans_bind(ctx, set, true);
 214 }
 215
 216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 217 {
 218         return __nft_set_trans_bind(ctx, set, false);
 219 }
 220
 221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 222                                    struct nft_chain *chain, bool bind)
 223 {
 224         struct nftables_pernet *nft_net;
 225         struct net *net = ctx->net;
 226         struct nft_trans *trans;
 227
 228         if (!nft_chain_binding(chain))
 229                 return;
 230
 231         nft_net = nft_pernet(net);
 232         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 233                 switch (trans->msg_type) {
 234                 case NFT_MSG_NEWCHAIN:
 235                         if (nft_trans_chain(trans) == chain)
 236                                 nft_trans_chain_bound(trans) = bind;
 237                         break;
 238                 case NFT_MSG_NEWRULE:
 239                         if (trans->ctx.chain == chain)
 240                                 nft_trans_rule_bound(trans) = bind;
 241                         break;
 242                 }
 243         }
 244 }
 245
 246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 247                                  struct nft_chain *chain)
 248 {
 249         __nft_chain_trans_bind(ctx, chain, true);
 250 }
 251
 252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 253 {
 254         if (!nft_chain_binding(chain))
 255                 return 0;
 256
 257         if (nft_chain_binding(ctx->chain))
 258                 return -EOPNOTSUPP;
 259
 260         if (chain->bound)
 261                 return -EBUSY;
 262
 263         if (!nft_use_inc(&chain->use))
 264                 return -EMFILE;
 265
 266         chain->bound = true;
 267         nft_chain_trans_bind(ctx, chain);
 268
 269         return 0;
 270 }
 271
 272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 273 {
 274         __nft_chain_trans_bind(ctx, chain, false);
 275 }
 276
 277 static int nft_netdev_register_hooks(struct net *net,
 278                                      struct list_head *hook_list)
 279 {
 280         struct nft_hook *hook;
 281         int err, j;
 282
 283         j = 0;
 284         list_for_each_entry(hook, hook_list, list) {
 285                 err = nf_register_net_hook(net, &hook->ops);
 286                 if (err < 0)
 287                         goto err_register;
 288
 289                 j++;
 290         }
 291         return 0;
 292
 293 err_register:
 294         list_for_each_entry(hook, hook_list, list) {
 295                 if (j-- <= 0)
 296                         break;
 297
 298                 nf_unregister_net_hook(net, &hook->ops);
 299         }
 300         return err;
 301 }
 302
 303 static void nft_netdev_unregister_hooks(struct net *net,
 304                                         struct list_head *hook_list,
 305                                         bool release_netdev)
 306 {
 307         struct nft_hook *hook, *next;
 308
 309         list_for_each_entry_safe(hook, next, hook_list, list) {
 310                 nf_unregister_net_hook(net, &hook->ops);
 311                 if (release_netdev) {
 312                         list_del(&hook->list);
 313                         kfree_rcu(hook, rcu);
 314                 }
 315         }
 316 }
 317
 318 static int nf_tables_register_hook(struct net *net,
 319                                    const struct nft_table *table,
 320                                    struct nft_chain *chain)
 321 {
 322         struct nft_base_chain *basechain;
 323         const struct nf_hook_ops *ops;
 324
 325         if (table->flags & NFT_TABLE_F_DORMANT ||
 326             !nft_is_base_chain(chain))
 327                 return 0;
 328
 329         basechain = nft_base_chain(chain);
 330         ops = &basechain->ops;
 331
 332         if (basechain->type->ops_register)
 333                 return basechain->type->ops_register(net, ops);
 334
 335         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 336                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 337
 338         return nf_register_net_hook(net, &basechain->ops);
 339 }
 340
 341 static void __nf_tables_unregister_hook(struct net *net,
 342                                         const struct nft_table *table,
 343                                         struct nft_chain *chain,
 344                                         bool release_netdev)
 345 {
 346         struct nft_base_chain *basechain;
 347         const struct nf_hook_ops *ops;
 348
 349         if (table->flags & NFT_TABLE_F_DORMANT ||
 350             !nft_is_base_chain(chain))
 351                 return;
 352         basechain = nft_base_chain(chain);
 353         ops = &basechain->ops;
 354
 355         if (basechain->type->ops_unregister)
 356                 return basechain->type->ops_unregister(net, ops);
 357
 358         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 359                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 360                                             release_netdev);
 361         else
 362                 nf_unregister_net_hook(net, &basechain->ops);
 363 }
 364
 365 static void nf_tables_unregister_hook(struct net *net,
 366                                       const struct nft_table *table,
 367                                       struct nft_chain *chain)
 368 {
 369         return __nf_tables_unregister_hook(net, table, chain, false);
 370 }
 371
 372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 373 {
 374         struct nftables_pernet *nft_net = nft_pernet(net);
 375
 376         switch (trans->msg_type) {
 377         case NFT_MSG_NEWSET:
 378                 if (!nft_trans_set_update(trans) &&
 379                     nft_set_is_anonymous(nft_trans_set(trans)))
 380                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 381                 break;
 382         case NFT_MSG_NEWCHAIN:
 383                 if (!nft_trans_chain_update(trans) &&
 384                     nft_chain_binding(nft_trans_chain(trans)))
 385                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 386                 break;
 387         }
 388
 389         list_add_tail(&trans->list, &nft_net->commit_list);
 390 }
 391
 392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 393 {
 394         struct nft_trans *trans;
 395
 396         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 397         if (trans == NULL)
 398                 return -ENOMEM;
 399
 400         if (msg_type == NFT_MSG_NEWTABLE)
 401                 nft_activate_next(ctx->net, ctx->table);
 402
 403         nft_trans_commit_list_add_tail(ctx->net, trans);
 404         return 0;
 405 }
 406
 407 static int nft_deltable(struct nft_ctx *ctx)
 408 {
 409         int err;
 410
 411         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 412         if (err < 0)
 413                 return err;
 414
 415         nft_deactivate_next(ctx->net, ctx->table);
 416         return err;
 417 }
 418
 419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 420 {
 421         struct nft_trans *trans;
 422
 423         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 424         if (trans == NULL)
 425                 return ERR_PTR(-ENOMEM);
 426
 427         if (msg_type == NFT_MSG_NEWCHAIN) {
 428                 nft_activate_next(ctx->net, ctx->chain);
 429
 430                 if (ctx->nla[NFTA_CHAIN_ID]) {
 431                         nft_trans_chain_id(trans) =
 432                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 433                 }
 434         }
 435         nft_trans_chain(trans) = ctx->chain;
 436         nft_trans_commit_list_add_tail(ctx->net, trans);
 437
 438         return trans;
 439 }
 440
 441 static int nft_delchain(struct nft_ctx *ctx)
 442 {
 443         struct nft_trans *trans;
 444
 445         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 446         if (IS_ERR(trans))
 447                 return PTR_ERR(trans);
 448
 449         nft_use_dec(&ctx->table->use);
 450         nft_deactivate_next(ctx->net, ctx->chain);
 451
 452         return 0;
 453 }
 454
 455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 456 {
 457         struct nft_expr *expr;
 458
 459         expr = nft_expr_first(rule);
 460         while (nft_expr_more(rule, expr)) {
 461                 if (expr->ops->activate)
 462                         expr->ops->activate(ctx, expr);
 463
 464                 expr = nft_expr_next(expr);
 465         }
 466 }
 467
 468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 469                               enum nft_trans_phase phase)
 470 {
 471         struct nft_expr *expr;
 472
 473         expr = nft_expr_first(rule);
 474         while (nft_expr_more(rule, expr)) {
 475                 if (expr->ops->deactivate)
 476                         expr->ops->deactivate(ctx, expr, phase);
 477
 478                 expr = nft_expr_next(expr);
 479         }
 480 }
 481
 482 static int
 483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 484 {
 485         /* You cannot delete the same rule twice */
 486         if (nft_is_active_next(ctx->net, rule)) {
 487                 nft_deactivate_next(ctx->net, rule);
 488                 nft_use_dec(&ctx->chain->use);
 489                 return 0;
 490         }
 491         return -ENOENT;
 492 }
 493
 494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 495                                             struct nft_rule *rule)
 496 {
 497         struct nft_trans *trans;
 498
 499         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 500         if (trans == NULL)
 501                 return NULL;
 502
 503         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 504                 nft_trans_rule_id(trans) =
 505                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 506         }
 507         nft_trans_rule(trans) = rule;
 508         nft_trans_commit_list_add_tail(ctx->net, trans);
 509
 510         return trans;
 511 }
 512
 513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 514 {
 515         struct nft_flow_rule *flow;
 516         struct nft_trans *trans;
 517         int err;
 518
 519         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 520         if (trans == NULL)
 521                 return -ENOMEM;
 522
 523         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 524                 flow = nft_flow_rule_create(ctx->net, rule);
 525                 if (IS_ERR(flow)) {
 526                         nft_trans_destroy(trans);
 527                         return PTR_ERR(flow);
 528                 }
 529
 530                 nft_trans_flow_rule(trans) = flow;
 531         }
 532
 533         err = nf_tables_delrule_deactivate(ctx, rule);
 534         if (err < 0) {
 535                 nft_trans_destroy(trans);
 536                 return err;
 537         }
 538         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 539
 540         return 0;
 541 }
 542
 543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 544 {
 545         struct nft_rule *rule;
 546         int err;
 547
 548         list_for_each_entry(rule, &ctx->chain->rules, list) {
 549                 if (!nft_is_active_next(ctx->net, rule))
 550                         continue;
 551
 552                 err = nft_delrule(ctx, rule);
 553                 if (err < 0)
 554                         return err;
 555         }
 556         return 0;
 557 }
 558
 559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 560                                struct nft_set *set,
 561                                const struct nft_set_desc *desc)
 562 {
 563         struct nft_trans *trans;
 564
 565         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 566         if (trans == NULL)
 567                 return -ENOMEM;
 568
 569         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 570                 nft_trans_set_id(trans) =
 571                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 572                 nft_activate_next(ctx->net, set);
 573         }
 574         nft_trans_set(trans) = set;
 575         if (desc) {
 576                 nft_trans_set_update(trans) = true;
 577                 nft_trans_set_gc_int(trans) = desc->gc_int;
 578                 nft_trans_set_timeout(trans) = desc->timeout;
 579                 nft_trans_set_size(trans) = desc->size;
 580         }
 581         nft_trans_commit_list_add_tail(ctx->net, trans);
 582
 583         return 0;
 584 }
 585
 586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 587                              struct nft_set *set)
 588 {
 589         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 590 }
 591
 592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 593                                   struct nft_set *set,
 594                                   const struct nft_set_iter *iter,
 595                                   struct nft_elem_priv *elem_priv)
 596 {
 597         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
 598
 599         return 0;
 600 }
 601
 602 struct nft_set_elem_catchall {
 603         struct list_head        list;
 604         struct rcu_head         rcu;
 605         struct nft_elem_priv    *elem;
 606 };
 607
 608 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 609                                         struct nft_set *set)
 610 {
 611         u8 genmask = nft_genmask_next(ctx->net);
 612         struct nft_set_elem_catchall *catchall;
 613         struct nft_set_ext *ext;
 614
 615         list_for_each_entry(catchall, &set->catchall_list, list) {
 616                 ext = nft_set_elem_ext(set, catchall->elem);
 617                 if (!nft_set_elem_active(ext, genmask))
 618                         continue;
 619
 620                 nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
 621                 break;
 622         }
 623 }
 624
 625 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 626 {
 627         struct nft_set_iter iter = {
 628                 .genmask        = nft_genmask_next(ctx->net),
 629                 .fn             = nft_mapelem_deactivate,
 630         };
 631
 632         set->ops->walk(ctx, set, &iter);
 633         WARN_ON_ONCE(iter.err);
 634
 635         nft_map_catchall_deactivate(ctx, set);
 636 }
 637
 638 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 639 {
 640         int err;
 641
 642         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 643         if (err < 0)
 644                 return err;
 645
 646         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 647                 nft_map_deactivate(ctx, set);
 648
 649         nft_deactivate_next(ctx->net, set);
 650         nft_use_dec(&ctx->table->use);
 651
 652         return err;
 653 }
 654
 655 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 656                              struct nft_object *obj)
 657 {
 658         struct nft_trans *trans;
 659
 660         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 661         if (trans == NULL)
 662                 return -ENOMEM;
 663
 664         if (msg_type == NFT_MSG_NEWOBJ)
 665                 nft_activate_next(ctx->net, obj);
 666
 667         nft_trans_obj(trans) = obj;
 668         nft_trans_commit_list_add_tail(ctx->net, trans);
 669
 670         return 0;
 671 }
 672
 673 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 674 {
 675         int err;
 676
 677         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 678         if (err < 0)
 679                 return err;
 680
 681         nft_deactivate_next(ctx->net, obj);
 682         nft_use_dec(&ctx->table->use);
 683
 684         return err;
 685 }
 686
 687 static struct nft_trans *
 688 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 689                         struct nft_flowtable *flowtable)
 690 {
 691         struct nft_trans *trans;
 692
 693         trans = nft_trans_alloc(ctx, msg_type,
 694                                 sizeof(struct nft_trans_flowtable));
 695         if (trans == NULL)
 696                 return ERR_PTR(-ENOMEM);
 697
 698         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 699                 nft_activate_next(ctx->net, flowtable);
 700
 701         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 702         nft_trans_flowtable(trans) = flowtable;
 703         nft_trans_commit_list_add_tail(ctx->net, trans);
 704
 705         return trans;
 706 }
 707
 708 static int nft_delflowtable(struct nft_ctx *ctx,
 709                             struct nft_flowtable *flowtable)
 710 {
 711         struct nft_trans *trans;
 712
 713         trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 714         if (IS_ERR(trans))
 715                 return PTR_ERR(trans);
 716
 717         nft_deactivate_next(ctx->net, flowtable);
 718         nft_use_dec(&ctx->table->use);
 719
 720         return 0;
 721 }
 722
 723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 724 {
 725         int i;
 726
 727         for (i = track->regs[dreg].num_reg; i > 0; i--)
 728                 __nft_reg_track_cancel(track, dreg - i);
 729 }
 730
 731 static void __nft_reg_track_update(struct nft_regs_track *track,
 732                                    const struct nft_expr *expr,
 733                                    u8 dreg, u8 num_reg)
 734 {
 735         track->regs[dreg].selector = expr;
 736         track->regs[dreg].bitwise = NULL;
 737         track->regs[dreg].num_reg = num_reg;
 738 }
 739
 740 void nft_reg_track_update(struct nft_regs_track *track,
 741                           const struct nft_expr *expr, u8 dreg, u8 len)
 742 {
 743         unsigned int regcount;
 744         int i;
 745
 746         __nft_reg_track_clobber(track, dreg);
 747
 748         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 749         for (i = 0; i < regcount; i++, dreg++)
 750                 __nft_reg_track_update(track, expr, dreg, i);
 751 }
 752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 753
 754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 755 {
 756         unsigned int regcount;
 757         int i;
 758
 759         __nft_reg_track_clobber(track, dreg);
 760
 761         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 762         for (i = 0; i < regcount; i++, dreg++)
 763                 __nft_reg_track_cancel(track, dreg);
 764 }
 765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 766
 767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 768 {
 769         track->regs[dreg].selector = NULL;
 770         track->regs[dreg].bitwise = NULL;
 771         track->regs[dreg].num_reg = 0;
 772 }
 773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 774
 775 /*
 776  * Tables
 777  */
 778
 779 static struct nft_table *nft_table_lookup(const struct net *net,
 780                                           const struct nlattr *nla,
 781                                           u8 family, u8 genmask, u32 nlpid)
 782 {
 783         struct nftables_pernet *nft_net;
 784         struct nft_table *table;
 785
 786         if (nla == NULL)
 787                 return ERR_PTR(-EINVAL);
 788
 789         nft_net = nft_pernet(net);
 790         list_for_each_entry_rcu(table, &nft_net->tables, list,
 791                                 lockdep_is_held(&nft_net->commit_mutex)) {
 792                 if (!nla_strcmp(nla, table->name) &&
 793                     table->family == family &&
 794                     nft_active_genmask(table, genmask)) {
 795                         if (nft_table_has_owner(table) &&
 796                             nlpid && table->nlpid != nlpid)
 797                                 return ERR_PTR(-EPERM);
 798
 799                         return table;
 800                 }
 801         }
 802
 803         return ERR_PTR(-ENOENT);
 804 }
 805
 806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 807                                                    const struct nlattr *nla,
 808                                                    int family, u8 genmask, u32 nlpid)
 809 {
 810         struct nftables_pernet *nft_net;
 811         struct nft_table *table;
 812
 813         nft_net = nft_pernet(net);
 814         list_for_each_entry(table, &nft_net->tables, list) {
 815                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 816                     table->family == family &&
 817                     nft_active_genmask(table, genmask)) {
 818                         if (nft_table_has_owner(table) &&
 819                             nlpid && table->nlpid != nlpid)
 820                                 return ERR_PTR(-EPERM);
 821
 822                         return table;
 823                 }
 824         }
 825
 826         return ERR_PTR(-ENOENT);
 827 }
 828
 829 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 830 {
 831         return ++table->hgenerator;
 832 }
 833
 834 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 835
 836 static const struct nft_chain_type *
 837 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 838 {
 839         if (family >= NFPROTO_NUMPROTO ||
 840             type >= NFT_CHAIN_T_MAX)
 841                 return NULL;
 842
 843         return chain_type[family][type];
 844 }
 845
 846 static const struct nft_chain_type *
 847 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 848 {
 849         const struct nft_chain_type *type;
 850         int i;
 851
 852         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 853                 type = __nft_chain_type_get(family, i);
 854                 if (!type)
 855                         continue;
 856                 if (!nla_strcmp(nla, type->name))
 857                         return type;
 858         }
 859         return NULL;
 860 }
 861
 862 struct nft_module_request {
 863         struct list_head        list;
 864         char                    module[MODULE_NAME_LEN];
 865         bool                    done;
 866 };
 867
 868 #ifdef CONFIG_MODULES
 869 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 870                                       ...)
 871 {
 872         char module_name[MODULE_NAME_LEN];
 873         struct nftables_pernet *nft_net;
 874         struct nft_module_request *req;
 875         va_list args;
 876         int ret;
 877
 878         va_start(args, fmt);
 879         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 880         va_end(args);
 881         if (ret >= MODULE_NAME_LEN)
 882                 return 0;
 883
 884         nft_net = nft_pernet(net);
 885         list_for_each_entry(req, &nft_net->module_list, list) {
 886                 if (!strcmp(req->module, module_name)) {
 887                         if (req->done)
 888                                 return 0;
 889
 890                         /* A request to load this module already exists. */
 891                         return -EAGAIN;
 892                 }
 893         }
 894
 895         req = kmalloc(sizeof(*req), GFP_KERNEL);
 896         if (!req)
 897                 return -ENOMEM;
 898
 899         req->done = false;
 900         strscpy(req->module, module_name, MODULE_NAME_LEN);
 901         list_add_tail(&req->list, &nft_net->module_list);
 902
 903         return -EAGAIN;
 904 }
 905 EXPORT_SYMBOL_GPL(nft_request_module);
 906 #endif
 907
 908 static void lockdep_nfnl_nft_mutex_not_held(void)
 909 {
 910 #ifdef CONFIG_PROVE_LOCKING
 911         if (debug_locks)
 912                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 913 #endif
 914 }
 915
 916 static const struct nft_chain_type *
 917 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 918                             u8 family, bool autoload)
 919 {
 920         const struct nft_chain_type *type;
 921
 922         type = __nf_tables_chain_type_lookup(nla, family);
 923         if (type != NULL)
 924                 return type;
 925
 926         lockdep_nfnl_nft_mutex_not_held();
 927 #ifdef CONFIG_MODULES
 928         if (autoload) {
 929                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 930                                        nla_len(nla),
 931                                        (const char *)nla_data(nla)) == -EAGAIN)
 932                         return ERR_PTR(-EAGAIN);
 933         }
 934 #endif
 935         return ERR_PTR(-ENOENT);
 936 }
 937
 938 static __be16 nft_base_seq(const struct net *net)
 939 {
 940         struct nftables_pernet *nft_net = nft_pernet(net);
 941
 942         return htons(nft_net->base_seq & 0xffff);
 943 }
 944
 945 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 946         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 947                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 948         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 949         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 950         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 951                                     .len = NFT_USERDATA_MAXLEN }
 952 };
 953
 954 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 955                                      u32 portid, u32 seq, int event, u32 flags,
 956                                      int family, const struct nft_table *table)
 957 {
 958         struct nlmsghdr *nlh;
 959
 960         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 961         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 962                            NFNETLINK_V0, nft_base_seq(net));
 963         if (!nlh)
 964                 goto nla_put_failure;
 965
 966         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 967             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 968             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 969                          NFTA_TABLE_PAD))
 970                 goto nla_put_failure;
 971
 972         if (event == NFT_MSG_DELTABLE) {
 973                 nlmsg_end(skb, nlh);
 974                 return 0;
 975         }
 976
 977         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 978                          htonl(table->flags & NFT_TABLE_F_MASK)))
 979                 goto nla_put_failure;
 980
 981         if (nft_table_has_owner(table) &&
 982             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 983                 goto nla_put_failure;
 984
 985         if (table->udata) {
 986                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 987                         goto nla_put_failure;
 988         }
 989
 990         nlmsg_end(skb, nlh);
 991         return 0;
 992
 993 nla_put_failure:
 994         nlmsg_trim(skb, nlh);
 995         return -1;
 996 }
 997
 998 struct nftnl_skb_parms {
 999         bool report;
1000 };
1001 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
1002
1003 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1004                                struct list_head *notify_list)
1005 {
1006         NFT_CB(skb).report = report;
1007         list_add_tail(&skb->list, notify_list);
1008 }
1009
1010 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1011 {
1012         struct nftables_pernet *nft_net;
1013         struct sk_buff *skb;
1014         u16 flags = 0;
1015         int err;
1016
1017         if (!ctx->report &&
1018             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1019                 return;
1020
1021         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1022         if (skb == NULL)
1023                 goto err;
1024
1025         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1026                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1027
1028         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1029                                         event, flags, ctx->family, ctx->table);
1030         if (err < 0) {
1031                 kfree_skb(skb);
1032                 goto err;
1033         }
1034
1035         nft_net = nft_pernet(ctx->net);
1036         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1037         return;
1038 err:
1039         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1040 }
1041
1042 static int nf_tables_dump_tables(struct sk_buff *skb,
1043                                  struct netlink_callback *cb)
1044 {
1045         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1046         struct nftables_pernet *nft_net;
1047         const struct nft_table *table;
1048         unsigned int idx = 0, s_idx = cb->args[0];
1049         struct net *net = sock_net(skb->sk);
1050         int family = nfmsg->nfgen_family;
1051
1052         rcu_read_lock();
1053         nft_net = nft_pernet(net);
1054         cb->seq = READ_ONCE(nft_net->base_seq);
1055
1056         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1057                 if (family != NFPROTO_UNSPEC && family != table->family)
1058                         continue;
1059
1060                 if (idx < s_idx)
1061                         goto cont;
1062                 if (idx > s_idx)
1063                         memset(&cb->args[1], 0,
1064                                sizeof(cb->args) - sizeof(cb->args[0]));
1065                 if (!nft_is_active(net, table))
1066                         continue;
1067                 if (nf_tables_fill_table_info(skb, net,
1068                                               NETLINK_CB(cb->skb).portid,
1069                                               cb->nlh->nlmsg_seq,
1070                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1071                                               table->family, table) < 0)
1072                         goto done;
1073
1074                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1075 cont:
1076                 idx++;
1077         }
1078 done:
1079         rcu_read_unlock();
1080         cb->args[0] = idx;
1081         return skb->len;
1082 }
1083
1084 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1085                                       const struct nlmsghdr *nlh,
1086                                       struct netlink_dump_control *c)
1087 {
1088         int err;
1089
1090         if (!try_module_get(THIS_MODULE))
1091                 return -EINVAL;
1092
1093         rcu_read_unlock();
1094         err = netlink_dump_start(nlsk, skb, nlh, c);
1095         rcu_read_lock();
1096         module_put(THIS_MODULE);
1097
1098         return err;
1099 }
1100
1101 /* called with rcu_read_lock held */
1102 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1103                               const struct nlattr * const nla[])
1104 {
1105         struct netlink_ext_ack *extack = info->extack;
1106         u8 genmask = nft_genmask_cur(info->net);
1107         u8 family = info->nfmsg->nfgen_family;
1108         const struct nft_table *table;
1109         struct net *net = info->net;
1110         struct sk_buff *skb2;
1111         int err;
1112
1113         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1114                 struct netlink_dump_control c = {
1115                         .dump = nf_tables_dump_tables,
1116                         .module = THIS_MODULE,
1117                 };
1118
1119                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1120         }
1121
1122         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1123         if (IS_ERR(table)) {
1124                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1125                 return PTR_ERR(table);
1126         }
1127
1128         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1129         if (!skb2)
1130                 return -ENOMEM;
1131
1132         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1133                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1134                                         0, family, table);
1135         if (err < 0)
1136                 goto err_fill_table_info;
1137
1138         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1139
1140 err_fill_table_info:
1141         kfree_skb(skb2);
1142         return err;
1143 }
1144
1145 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1146 {
1147         struct nft_chain *chain;
1148         u32 i = 0;
1149
1150         list_for_each_entry(chain, &table->chains, list) {
1151                 if (!nft_is_active_next(net, chain))
1152                         continue;
1153                 if (!nft_is_base_chain(chain))
1154                         continue;
1155
1156                 if (cnt && i++ == cnt)
1157                         break;
1158
1159                 nf_tables_unregister_hook(net, table, chain);
1160         }
1161 }
1162
1163 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1164 {
1165         struct nft_chain *chain;
1166         int err, i = 0;
1167
1168         list_for_each_entry(chain, &table->chains, list) {
1169                 if (!nft_is_active_next(net, chain))
1170                         continue;
1171                 if (!nft_is_base_chain(chain))
1172                         continue;
1173
1174                 err = nf_tables_register_hook(net, table, chain);
1175                 if (err < 0)
1176                         goto err_register_hooks;
1177
1178                 i++;
1179         }
1180         return 0;
1181
1182 err_register_hooks:
1183         if (i)
1184                 nft_table_disable(net, table, i);
1185         return err;
1186 }
1187
1188 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1189 {
1190         table->flags &= ~NFT_TABLE_F_DORMANT;
1191         nft_table_disable(net, table, 0);
1192         table->flags |= NFT_TABLE_F_DORMANT;
1193 }
1194
1195 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1196 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1197 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1198 #define __NFT_TABLE_F_WAS_ORPHAN        (__NFT_TABLE_F_INTERNAL << 2)
1199 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1200                                          __NFT_TABLE_F_WAS_AWAKEN | \
1201                                          __NFT_TABLE_F_WAS_ORPHAN)
1202
1203 static bool nft_table_pending_update(const struct nft_ctx *ctx)
1204 {
1205         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1206         struct nft_trans *trans;
1207
1208         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1209                 return true;
1210
1211         list_for_each_entry(trans, &nft_net->commit_list, list) {
1212                 if ((trans->msg_type == NFT_MSG_NEWCHAIN ||
1213                      trans->msg_type == NFT_MSG_DELCHAIN) &&
1214                     trans->ctx.table == ctx->table &&
1215                     nft_trans_chain_update(trans))
1216                         return true;
1217         }
1218
1219         return false;
1220 }
1221
1222 static int nf_tables_updtable(struct nft_ctx *ctx)
1223 {
1224         struct nft_trans *trans;
1225         u32 flags;
1226         int ret;
1227
1228         if (!ctx->nla[NFTA_TABLE_FLAGS])
1229                 return 0;
1230
1231         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1232         if (flags & ~NFT_TABLE_F_MASK)
1233                 return -EOPNOTSUPP;
1234
1235         if (flags == (ctx->table->flags & NFT_TABLE_F_MASK))
1236                 return 0;
1237
1238         if ((nft_table_has_owner(ctx->table) &&
1239              !(flags & NFT_TABLE_F_OWNER)) ||
1240             (flags & NFT_TABLE_F_OWNER &&
1241              !nft_table_is_orphan(ctx->table)))
1242                 return -EOPNOTSUPP;
1243
1244         if ((flags ^ ctx->table->flags) & NFT_TABLE_F_PERSIST)
1245                 return -EOPNOTSUPP;
1246
1247         /* No dormant off/on/off/on games in single transaction */
1248         if (nft_table_pending_update(ctx))
1249                 return -EINVAL;
1250
1251         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1252                                 sizeof(struct nft_trans_table));
1253         if (trans == NULL)
1254                 return -ENOMEM;
1255
1256         if ((flags & NFT_TABLE_F_DORMANT) &&
1257             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1258                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1259                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1260                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1261         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1262                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1263                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1264                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1265                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1266                         if (ret < 0)
1267                                 goto err_register_hooks;
1268
1269                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1270                 }
1271         }
1272
1273         if ((flags & NFT_TABLE_F_OWNER) &&
1274             !nft_table_has_owner(ctx->table)) {
1275                 ctx->table->nlpid = ctx->portid;
1276                 ctx->table->flags |= NFT_TABLE_F_OWNER |
1277                                      __NFT_TABLE_F_WAS_ORPHAN;
1278         }
1279
1280         nft_trans_table_update(trans) = true;
1281         nft_trans_commit_list_add_tail(ctx->net, trans);
1282
1283         return 0;
1284
1285 err_register_hooks:
1286         ctx->table->flags |= NFT_TABLE_F_DORMANT;
1287         nft_trans_destroy(trans);
1288         return ret;
1289 }
1290
1291 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1292 {
1293         const char *name = data;
1294
1295         return jhash(name, strlen(name), seed);
1296 }
1297
1298 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1299 {
1300         const struct nft_chain *chain = data;
1301
1302         return nft_chain_hash(chain->name, 0, seed);
1303 }
1304
1305 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1306                               const void *ptr)
1307 {
1308         const struct nft_chain *chain = ptr;
1309         const char *name = arg->key;
1310
1311         return strcmp(chain->name, name);
1312 }
1313
1314 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1315 {
1316         const struct nft_object_hash_key *k = data;
1317
1318         seed ^= hash_ptr(k->table, 32);
1319
1320         return jhash(k->name, strlen(k->name), seed);
1321 }
1322
1323 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1324 {
1325         const struct nft_object *obj = data;
1326
1327         return nft_objname_hash(&obj->key, 0, seed);
1328 }
1329
1330 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1331                                 const void *ptr)
1332 {
1333         const struct nft_object_hash_key *k = arg->key;
1334         const struct nft_object *obj = ptr;
1335
1336         if (obj->key.table != k->table)
1337                 return -1;
1338
1339         return strcmp(obj->key.name, k->name);
1340 }
1341
1342 static bool nft_supported_family(u8 family)
1343 {
1344         return false
1345 #ifdef CONFIG_NF_TABLES_INET
1346                 || family == NFPROTO_INET
1347 #endif
1348 #ifdef CONFIG_NF_TABLES_IPV4
1349                 || family == NFPROTO_IPV4
1350 #endif
1351 #ifdef CONFIG_NF_TABLES_ARP
1352                 || family == NFPROTO_ARP
1353 #endif
1354 #ifdef CONFIG_NF_TABLES_NETDEV
1355                 || family == NFPROTO_NETDEV
1356 #endif
1357 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1358                 || family == NFPROTO_BRIDGE
1359 #endif
1360 #ifdef CONFIG_NF_TABLES_IPV6
1361                 || family == NFPROTO_IPV6
1362 #endif
1363                 ;
1364 }
1365
1366 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1367                               const struct nlattr * const nla[])
1368 {
1369         struct nftables_pernet *nft_net = nft_pernet(info->net);
1370         struct netlink_ext_ack *extack = info->extack;
1371         u8 genmask = nft_genmask_next(info->net);
1372         u8 family = info->nfmsg->nfgen_family;
1373         struct net *net = info->net;
1374         const struct nlattr *attr;
1375         struct nft_table *table;
1376         struct nft_ctx ctx;
1377         u32 flags = 0;
1378         int err;
1379
1380         if (!nft_supported_family(family))
1381                 return -EOPNOTSUPP;
1382
1383         lockdep_assert_held(&nft_net->commit_mutex);
1384         attr = nla[NFTA_TABLE_NAME];
1385         table = nft_table_lookup(net, attr, family, genmask,
1386                                  NETLINK_CB(skb).portid);
1387         if (IS_ERR(table)) {
1388                 if (PTR_ERR(table) != -ENOENT)
1389                         return PTR_ERR(table);
1390         } else {
1391                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1392                         NL_SET_BAD_ATTR(extack, attr);
1393                         return -EEXIST;
1394                 }
1395                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1396                         return -EOPNOTSUPP;
1397
1398                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1399
1400                 return nf_tables_updtable(&ctx);
1401         }
1402
1403         if (nla[NFTA_TABLE_FLAGS]) {
1404                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1405                 if (flags & ~NFT_TABLE_F_MASK)
1406                         return -EOPNOTSUPP;
1407         }
1408
1409         err = -ENOMEM;
1410         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1411         if (table == NULL)
1412                 goto err_kzalloc;
1413
1414         table->validate_state = nft_net->validate_state;
1415         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1416         if (table->name == NULL)
1417                 goto err_strdup;
1418
1419         if (nla[NFTA_TABLE_USERDATA]) {
1420                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1421                 if (table->udata == NULL)
1422                         goto err_table_udata;
1423
1424                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1425         }
1426
1427         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1428         if (err)
1429                 goto err_chain_ht;
1430
1431         INIT_LIST_HEAD(&table->chains);
1432         INIT_LIST_HEAD(&table->sets);
1433         INIT_LIST_HEAD(&table->objects);
1434         INIT_LIST_HEAD(&table->flowtables);
1435         table->family = family;
1436         table->flags = flags;
1437         table->handle = ++nft_net->table_handle;
1438         if (table->flags & NFT_TABLE_F_OWNER)
1439                 table->nlpid = NETLINK_CB(skb).portid;
1440
1441         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1442         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1443         if (err < 0)
1444                 goto err_trans;
1445
1446         list_add_tail_rcu(&table->list, &nft_net->tables);
1447         return 0;
1448 err_trans:
1449         rhltable_destroy(&table->chains_ht);
1450 err_chain_ht:
1451         kfree(table->udata);
1452 err_table_udata:
1453         kfree(table->name);
1454 err_strdup:
1455         kfree(table);
1456 err_kzalloc:
1457         return err;
1458 }
1459
1460 static int nft_flush_table(struct nft_ctx *ctx)
1461 {
1462         struct nft_flowtable *flowtable, *nft;
1463         struct nft_chain *chain, *nc;
1464         struct nft_object *obj, *ne;
1465         struct nft_set *set, *ns;
1466         int err;
1467
1468         list_for_each_entry(chain, &ctx->table->chains, list) {
1469                 if (!nft_is_active_next(ctx->net, chain))
1470                         continue;
1471
1472                 if (nft_chain_binding(chain))
1473                         continue;
1474
1475                 ctx->chain = chain;
1476
1477                 err = nft_delrule_by_chain(ctx);
1478                 if (err < 0)
1479                         goto out;
1480         }
1481
1482         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1483                 if (!nft_is_active_next(ctx->net, set))
1484                         continue;
1485
1486                 if (nft_set_is_anonymous(set))
1487                         continue;
1488
1489                 err = nft_delset(ctx, set);
1490                 if (err < 0)
1491                         goto out;
1492         }
1493
1494         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1495                 if (!nft_is_active_next(ctx->net, flowtable))
1496                         continue;
1497
1498                 err = nft_delflowtable(ctx, flowtable);
1499                 if (err < 0)
1500                         goto out;
1501         }
1502
1503         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1504                 if (!nft_is_active_next(ctx->net, obj))
1505                         continue;
1506
1507                 err = nft_delobj(ctx, obj);
1508                 if (err < 0)
1509                         goto out;
1510         }
1511
1512         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1513                 if (!nft_is_active_next(ctx->net, chain))
1514                         continue;
1515
1516                 if (nft_chain_binding(chain))
1517                         continue;
1518
1519                 ctx->chain = chain;
1520
1521                 err = nft_delchain(ctx);
1522                 if (err < 0)
1523                         goto out;
1524         }
1525
1526         err = nft_deltable(ctx);
1527 out:
1528         return err;
1529 }
1530
1531 static int nft_flush(struct nft_ctx *ctx, int family)
1532 {
1533         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1534         const struct nlattr * const *nla = ctx->nla;
1535         struct nft_table *table, *nt;
1536         int err = 0;
1537
1538         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1539                 if (family != AF_UNSPEC && table->family != family)
1540                         continue;
1541
1542                 ctx->family = table->family;
1543
1544                 if (!nft_is_active_next(ctx->net, table))
1545                         continue;
1546
1547                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1548                         continue;
1549
1550                 if (nla[NFTA_TABLE_NAME] &&
1551                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1552                         continue;
1553
1554                 ctx->table = table;
1555
1556                 err = nft_flush_table(ctx);
1557                 if (err < 0)
1558                         goto out;
1559         }
1560 out:
1561         return err;
1562 }
1563
1564 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1565                               const struct nlattr * const nla[])
1566 {
1567         struct netlink_ext_ack *extack = info->extack;
1568         u8 genmask = nft_genmask_next(info->net);
1569         u8 family = info->nfmsg->nfgen_family;
1570         struct net *net = info->net;
1571         const struct nlattr *attr;
1572         struct nft_table *table;
1573         struct nft_ctx ctx;
1574
1575         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1576         if (family == AF_UNSPEC ||
1577             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1578                 return nft_flush(&ctx, family);
1579
1580         if (nla[NFTA_TABLE_HANDLE]) {
1581                 attr = nla[NFTA_TABLE_HANDLE];
1582                 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1583                                                   NETLINK_CB(skb).portid);
1584         } else {
1585                 attr = nla[NFTA_TABLE_NAME];
1586                 table = nft_table_lookup(net, attr, family, genmask,
1587                                          NETLINK_CB(skb).portid);
1588         }
1589
1590         if (IS_ERR(table)) {
1591                 if (PTR_ERR(table) == -ENOENT &&
1592                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1593                         return 0;
1594
1595                 NL_SET_BAD_ATTR(extack, attr);
1596                 return PTR_ERR(table);
1597         }
1598
1599         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1600             table->use > 0)
1601                 return -EBUSY;
1602
1603         ctx.family = family;
1604         ctx.table = table;
1605
1606         return nft_flush_table(&ctx);
1607 }
1608
1609 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1610 {
1611         if (WARN_ON(ctx->table->use > 0))
1612                 return;
1613
1614         rhltable_destroy(&ctx->table->chains_ht);
1615         kfree(ctx->table->name);
1616         kfree(ctx->table->udata);
1617         kfree(ctx->table);
1618 }
1619
1620 void nft_register_chain_type(const struct nft_chain_type *ctype)
1621 {
1622         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1623         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1624                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1625                 return;
1626         }
1627         chain_type[ctype->family][ctype->type] = ctype;
1628         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1629 }
1630 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1631
1632 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1633 {
1634         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1635         chain_type[ctype->family][ctype->type] = NULL;
1636         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1637 }
1638 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1639
1640 /*
1641  * Chains
1642  */
1643
1644 static struct nft_chain *
1645 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1646 {
1647         struct nft_chain *chain;
1648
1649         list_for_each_entry(chain, &table->chains, list) {
1650                 if (chain->handle == handle &&
1651                     nft_active_genmask(chain, genmask))
1652                         return chain;
1653         }
1654
1655         return ERR_PTR(-ENOENT);
1656 }
1657
1658 static bool lockdep_commit_lock_is_held(const struct net *net)
1659 {
1660 #ifdef CONFIG_PROVE_LOCKING
1661         struct nftables_pernet *nft_net = nft_pernet(net);
1662
1663         return lockdep_is_held(&nft_net->commit_mutex);
1664 #else
1665         return true;
1666 #endif
1667 }
1668
1669 static struct nft_chain *nft_chain_lookup(struct net *net,
1670                                           struct nft_table *table,
1671                                           const struct nlattr *nla, u8 genmask)
1672 {
1673         char search[NFT_CHAIN_MAXNAMELEN + 1];
1674         struct rhlist_head *tmp, *list;
1675         struct nft_chain *chain;
1676
1677         if (nla == NULL)
1678                 return ERR_PTR(-EINVAL);
1679
1680         nla_strscpy(search, nla, sizeof(search));
1681
1682         WARN_ON(!rcu_read_lock_held() &&
1683                 !lockdep_commit_lock_is_held(net));
1684
1685         chain = ERR_PTR(-ENOENT);
1686         rcu_read_lock();
1687         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1688         if (!list)
1689                 goto out_unlock;
1690
1691         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1692                 if (nft_active_genmask(chain, genmask))
1693                         goto out_unlock;
1694         }
1695         chain = ERR_PTR(-ENOENT);
1696 out_unlock:
1697         rcu_read_unlock();
1698         return chain;
1699 }
1700
1701 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1702         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1703                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1704         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1705         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1706                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1707         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1708         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1709         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1710                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1711         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1712         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1713         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1714         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1715                                     .len = NFT_USERDATA_MAXLEN },
1716 };
1717
1718 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1719         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1720         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1721         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1722                                     .len = IFNAMSIZ - 1 },
1723 };
1724
1725 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1726 {
1727         struct nft_stats *cpu_stats, total;
1728         struct nlattr *nest;
1729         unsigned int seq;
1730         u64 pkts, bytes;
1731         int cpu;
1732
1733         if (!stats)
1734                 return 0;
1735
1736         memset(&total, 0, sizeof(total));
1737         for_each_possible_cpu(cpu) {
1738                 cpu_stats = per_cpu_ptr(stats, cpu);
1739                 do {
1740                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1741                         pkts = cpu_stats->pkts;
1742                         bytes = cpu_stats->bytes;
1743                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1744                 total.pkts += pkts;
1745                 total.bytes += bytes;
1746         }
1747         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1748         if (nest == NULL)
1749                 goto nla_put_failure;
1750
1751         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1752                          NFTA_COUNTER_PAD) ||
1753             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1754                          NFTA_COUNTER_PAD))
1755                 goto nla_put_failure;
1756
1757         nla_nest_end(skb, nest);
1758         return 0;
1759
1760 nla_put_failure:
1761         return -ENOSPC;
1762 }
1763
1764 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1765                                    const struct nft_base_chain *basechain,
1766                                    const struct list_head *hook_list)
1767 {
1768         const struct nf_hook_ops *ops = &basechain->ops;
1769         struct nft_hook *hook, *first = NULL;
1770         struct nlattr *nest, *nest_devs;
1771         int n = 0;
1772
1773         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1774         if (nest == NULL)
1775                 goto nla_put_failure;
1776         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1777                 goto nla_put_failure;
1778         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1779                 goto nla_put_failure;
1780
1781         if (nft_base_chain_netdev(family, ops->hooknum)) {
1782                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1783                 if (!nest_devs)
1784                         goto nla_put_failure;
1785
1786                 if (!hook_list)
1787                         hook_list = &basechain->hook_list;
1788
1789                 list_for_each_entry(hook, hook_list, list) {
1790                         if (!first)
1791                                 first = hook;
1792
1793                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1794                                            hook->ops.dev->name))
1795                                 goto nla_put_failure;
1796                         n++;
1797                 }
1798                 nla_nest_end(skb, nest_devs);
1799
1800                 if (n == 1 &&
1801                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1802                         goto nla_put_failure;
1803         }
1804         nla_nest_end(skb, nest);
1805
1806         return 0;
1807 nla_put_failure:
1808         return -1;
1809 }
1810
1811 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1812                                      u32 portid, u32 seq, int event, u32 flags,
1813                                      int family, const struct nft_table *table,
1814                                      const struct nft_chain *chain,
1815                                      const struct list_head *hook_list)
1816 {
1817         struct nlmsghdr *nlh;
1818
1819         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1820         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1821                            NFNETLINK_V0, nft_base_seq(net));
1822         if (!nlh)
1823                 goto nla_put_failure;
1824
1825         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1826             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1827             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1828                          NFTA_CHAIN_PAD))
1829                 goto nla_put_failure;
1830
1831         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1832                 nlmsg_end(skb, nlh);
1833                 return 0;
1834         }
1835
1836         if (nft_is_base_chain(chain)) {
1837                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1838                 struct nft_stats __percpu *stats;
1839
1840                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1841                         goto nla_put_failure;
1842
1843                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1844                                  htonl(basechain->policy)))
1845                         goto nla_put_failure;
1846
1847                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1848                         goto nla_put_failure;
1849
1850                 stats = rcu_dereference_check(basechain->stats,
1851                                               lockdep_commit_lock_is_held(net));
1852                 if (nft_dump_stats(skb, stats))
1853                         goto nla_put_failure;
1854         }
1855
1856         if (chain->flags &&
1857             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1858                 goto nla_put_failure;
1859
1860         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1861                 goto nla_put_failure;
1862
1863         if (chain->udata &&
1864             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1865                 goto nla_put_failure;
1866
1867         nlmsg_end(skb, nlh);
1868         return 0;
1869
1870 nla_put_failure:
1871         nlmsg_trim(skb, nlh);
1872         return -1;
1873 }
1874
1875 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1876                                    const struct list_head *hook_list)
1877 {
1878         struct nftables_pernet *nft_net;
1879         struct sk_buff *skb;
1880         u16 flags = 0;
1881         int err;
1882
1883         if (!ctx->report &&
1884             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1885                 return;
1886
1887         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1888         if (skb == NULL)
1889                 goto err;
1890
1891         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1892                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1893
1894         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1895                                         event, flags, ctx->family, ctx->table,
1896                                         ctx->chain, hook_list);
1897         if (err < 0) {
1898                 kfree_skb(skb);
1899                 goto err;
1900         }
1901
1902         nft_net = nft_pernet(ctx->net);
1903         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1904         return;
1905 err:
1906         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1907 }
1908
1909 static int nf_tables_dump_chains(struct sk_buff *skb,
1910                                  struct netlink_callback *cb)
1911 {
1912         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1913         unsigned int idx = 0, s_idx = cb->args[0];
1914         struct net *net = sock_net(skb->sk);
1915         int family = nfmsg->nfgen_family;
1916         struct nftables_pernet *nft_net;
1917         const struct nft_table *table;
1918         const struct nft_chain *chain;
1919
1920         rcu_read_lock();
1921         nft_net = nft_pernet(net);
1922         cb->seq = READ_ONCE(nft_net->base_seq);
1923
1924         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1925                 if (family != NFPROTO_UNSPEC && family != table->family)
1926                         continue;
1927
1928                 list_for_each_entry_rcu(chain, &table->chains, list) {
1929                         if (idx < s_idx)
1930                                 goto cont;
1931                         if (idx > s_idx)
1932                                 memset(&cb->args[1], 0,
1933                                        sizeof(cb->args) - sizeof(cb->args[0]));
1934                         if (!nft_is_active(net, chain))
1935                                 continue;
1936                         if (nf_tables_fill_chain_info(skb, net,
1937                                                       NETLINK_CB(cb->skb).portid,
1938                                                       cb->nlh->nlmsg_seq,
1939                                                       NFT_MSG_NEWCHAIN,
1940                                                       NLM_F_MULTI,
1941                                                       table->family, table,
1942                                                       chain, NULL) < 0)
1943                                 goto done;
1944
1945                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1946 cont:
1947                         idx++;
1948                 }
1949         }
1950 done:
1951         rcu_read_unlock();
1952         cb->args[0] = idx;
1953         return skb->len;
1954 }
1955
1956 /* called with rcu_read_lock held */
1957 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1958                               const struct nlattr * const nla[])
1959 {
1960         struct netlink_ext_ack *extack = info->extack;
1961         u8 genmask = nft_genmask_cur(info->net);
1962         u8 family = info->nfmsg->nfgen_family;
1963         const struct nft_chain *chain;
1964         struct net *net = info->net;
1965         struct nft_table *table;
1966         struct sk_buff *skb2;
1967         int err;
1968
1969         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1970                 struct netlink_dump_control c = {
1971                         .dump = nf_tables_dump_chains,
1972                         .module = THIS_MODULE,
1973                 };
1974
1975                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1976         }
1977
1978         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1979         if (IS_ERR(table)) {
1980                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1981                 return PTR_ERR(table);
1982         }
1983
1984         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1985         if (IS_ERR(chain)) {
1986                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1987                 return PTR_ERR(chain);
1988         }
1989
1990         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1991         if (!skb2)
1992                 return -ENOMEM;
1993
1994         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1995                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1996                                         0, family, table, chain, NULL);
1997         if (err < 0)
1998                 goto err_fill_chain_info;
1999
2000         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
2001
2002 err_fill_chain_info:
2003         kfree_skb(skb2);
2004         return err;
2005 }
2006
2007 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
2008         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
2009         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
2010 };
2011
2012 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
2013 {
2014         struct nlattr *tb[NFTA_COUNTER_MAX+1];
2015         struct nft_stats __percpu *newstats;
2016         struct nft_stats *stats;
2017         int err;
2018
2019         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2020                                           nft_counter_policy, NULL);
2021         if (err < 0)
2022                 return ERR_PTR(err);
2023
2024         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2025                 return ERR_PTR(-EINVAL);
2026
2027         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2028         if (newstats == NULL)
2029                 return ERR_PTR(-ENOMEM);
2030
2031         /* Restore old counters on this cpu, no problem. Per-cpu statistics
2032          * are not exposed to userspace.
2033          */
2034         preempt_disable();
2035         stats = this_cpu_ptr(newstats);
2036         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2037         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2038         preempt_enable();
2039
2040         return newstats;
2041 }
2042
2043 static void nft_chain_stats_replace(struct nft_trans *trans)
2044 {
2045         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2046
2047         if (!nft_trans_chain_stats(trans))
2048                 return;
2049
2050         nft_trans_chain_stats(trans) =
2051                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2052                                     lockdep_commit_lock_is_held(trans->ctx.net));
2053
2054         if (!nft_trans_chain_stats(trans))
2055                 static_branch_inc(&nft_counters_enabled);
2056 }
2057
2058 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2059 {
2060         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2061         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2062
2063         if (g0 != g1)
2064                 kvfree(g1);
2065         kvfree(g0);
2066
2067         /* should be NULL either via abort or via successful commit */
2068         WARN_ON_ONCE(chain->blob_next);
2069         kvfree(chain->blob_next);
2070 }
2071
2072 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2073 {
2074         struct nft_chain *chain = ctx->chain;
2075         struct nft_hook *hook, *next;
2076
2077         if (WARN_ON(chain->use > 0))
2078                 return;
2079
2080         /* no concurrent access possible anymore */
2081         nf_tables_chain_free_chain_rules(chain);
2082
2083         if (nft_is_base_chain(chain)) {
2084                 struct nft_base_chain *basechain = nft_base_chain(chain);
2085
2086                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2087                         list_for_each_entry_safe(hook, next,
2088                                                  &basechain->hook_list, list) {
2089                                 list_del_rcu(&hook->list);
2090                                 kfree_rcu(hook, rcu);
2091                         }
2092                 }
2093                 module_put(basechain->type->owner);
2094                 if (rcu_access_pointer(basechain->stats)) {
2095                         static_branch_dec(&nft_counters_enabled);
2096                         free_percpu(rcu_dereference_raw(basechain->stats));
2097                 }
2098                 kfree(chain->name);
2099                 kfree(chain->udata);
2100                 kfree(basechain);
2101         } else {
2102                 kfree(chain->name);
2103                 kfree(chain->udata);
2104                 kfree(chain);
2105         }
2106 }
2107
2108 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2109                                               const struct nlattr *attr)
2110 {
2111         struct net_device *dev;
2112         char ifname[IFNAMSIZ];
2113         struct nft_hook *hook;
2114         int err;
2115
2116         hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2117         if (!hook) {
2118                 err = -ENOMEM;
2119                 goto err_hook_alloc;
2120         }
2121
2122         nla_strscpy(ifname, attr, IFNAMSIZ);
2123         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2124          * indirectly serializing all the other holders of the commit_mutex with
2125          * the rtnl_mutex.
2126          */
2127         dev = __dev_get_by_name(net, ifname);
2128         if (!dev) {
2129                 err = -ENOENT;
2130                 goto err_hook_dev;
2131         }
2132         hook->ops.dev = dev;
2133
2134         return hook;
2135
2136 err_hook_dev:
2137         kfree(hook);
2138 err_hook_alloc:
2139         return ERR_PTR(err);
2140 }
2141
2142 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2143                                            const struct nft_hook *this)
2144 {
2145         struct nft_hook *hook;
2146
2147         list_for_each_entry(hook, hook_list, list) {
2148                 if (this->ops.dev == hook->ops.dev)
2149                         return hook;
2150         }
2151
2152         return NULL;
2153 }
2154
2155 static int nf_tables_parse_netdev_hooks(struct net *net,
2156                                         const struct nlattr *attr,
2157                                         struct list_head *hook_list,
2158                                         struct netlink_ext_ack *extack)
2159 {
2160         struct nft_hook *hook, *next;
2161         const struct nlattr *tmp;
2162         int rem, n = 0, err;
2163
2164         nla_for_each_nested(tmp, attr, rem) {
2165                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2166                         err = -EINVAL;
2167                         goto err_hook;
2168                 }
2169
2170                 hook = nft_netdev_hook_alloc(net, tmp);
2171                 if (IS_ERR(hook)) {
2172                         NL_SET_BAD_ATTR(extack, tmp);
2173                         err = PTR_ERR(hook);
2174                         goto err_hook;
2175                 }
2176                 if (nft_hook_list_find(hook_list, hook)) {
2177                         NL_SET_BAD_ATTR(extack, tmp);
2178                         kfree(hook);
2179                         err = -EEXIST;
2180                         goto err_hook;
2181                 }
2182                 list_add_tail(&hook->list, hook_list);
2183                 n++;
2184
2185                 if (n == NFT_NETDEVICE_MAX) {
2186                         err = -EFBIG;
2187                         goto err_hook;
2188                 }
2189         }
2190
2191         return 0;
2192
2193 err_hook:
2194         list_for_each_entry_safe(hook, next, hook_list, list) {
2195                 list_del(&hook->list);
2196                 kfree(hook);
2197         }
2198         return err;
2199 }
2200
2201 struct nft_chain_hook {
2202         u32                             num;
2203         s32                             priority;
2204         const struct nft_chain_type     *type;
2205         struct list_head                list;
2206 };
2207
2208 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2209                                   struct list_head *hook_list,
2210                                   struct netlink_ext_ack *extack, u32 flags)
2211 {
2212         struct nft_hook *hook;
2213         int err;
2214
2215         if (tb[NFTA_HOOK_DEV]) {
2216                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2217                 if (IS_ERR(hook)) {
2218                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2219                         return PTR_ERR(hook);
2220                 }
2221
2222                 list_add_tail(&hook->list, hook_list);
2223         } else if (tb[NFTA_HOOK_DEVS]) {
2224                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2225                                                    hook_list, extack);
2226                 if (err < 0)
2227                         return err;
2228
2229         }
2230
2231         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2232             list_empty(hook_list))
2233                 return -EINVAL;
2234
2235         return 0;
2236 }
2237
2238 static int nft_chain_parse_hook(struct net *net,
2239                                 struct nft_base_chain *basechain,
2240                                 const struct nlattr * const nla[],
2241                                 struct nft_chain_hook *hook, u8 family,
2242                                 u32 flags, struct netlink_ext_ack *extack)
2243 {
2244         struct nftables_pernet *nft_net = nft_pernet(net);
2245         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2246         const struct nft_chain_type *type;
2247         int err;
2248
2249         lockdep_assert_held(&nft_net->commit_mutex);
2250         lockdep_nfnl_nft_mutex_not_held();
2251
2252         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2253                                           nla[NFTA_CHAIN_HOOK],
2254                                           nft_hook_policy, NULL);
2255         if (err < 0)
2256                 return err;
2257
2258         if (!basechain) {
2259                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2260                     !ha[NFTA_HOOK_PRIORITY]) {
2261                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2262                         return -ENOENT;
2263                 }
2264
2265                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2266                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2267
2268                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2269                 if (!type)
2270                         return -EOPNOTSUPP;
2271
2272                 if (nla[NFTA_CHAIN_TYPE]) {
2273                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2274                                                            family, true);
2275                         if (IS_ERR(type)) {
2276                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2277                                 return PTR_ERR(type);
2278                         }
2279                 }
2280                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2281                         return -EOPNOTSUPP;
2282
2283                 if (type->type == NFT_CHAIN_T_NAT &&
2284                     hook->priority <= NF_IP_PRI_CONNTRACK)
2285                         return -EOPNOTSUPP;
2286         } else {
2287                 if (ha[NFTA_HOOK_HOOKNUM]) {
2288                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2289                         if (hook->num != basechain->ops.hooknum)
2290                                 return -EOPNOTSUPP;
2291                 }
2292                 if (ha[NFTA_HOOK_PRIORITY]) {
2293                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2294                         if (hook->priority != basechain->ops.priority)
2295                                 return -EOPNOTSUPP;
2296                 }
2297
2298                 if (nla[NFTA_CHAIN_TYPE]) {
2299                         type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2300                                                              family);
2301                         if (!type) {
2302                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2303                                 return -ENOENT;
2304                         }
2305                 } else {
2306                         type = basechain->type;
2307                 }
2308         }
2309
2310         if (!try_module_get(type->owner)) {
2311                 if (nla[NFTA_CHAIN_TYPE])
2312                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2313                 return -ENOENT;
2314         }
2315
2316         hook->type = type;
2317
2318         INIT_LIST_HEAD(&hook->list);
2319         if (nft_base_chain_netdev(family, hook->num)) {
2320                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2321                 if (err < 0) {
2322                         module_put(type->owner);
2323                         return err;
2324                 }
2325         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2326                 module_put(type->owner);
2327                 return -EOPNOTSUPP;
2328         }
2329
2330         return 0;
2331 }
2332
2333 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2334 {
2335         struct nft_hook *h, *next;
2336
2337         list_for_each_entry_safe(h, next, &hook->list, list) {
2338                 list_del(&h->list);
2339                 kfree(h);
2340         }
2341         module_put(hook->type->owner);
2342 }
2343
2344 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2345 {
2346         struct nft_rule_dp_last *lrule;
2347
2348         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2349
2350         lrule = (struct nft_rule_dp_last *)ptr;
2351         lrule->end.is_last = 1;
2352         lrule->chain = chain;
2353         /* blob size does not include the trailer rule */
2354 }
2355
2356 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2357                                                          unsigned int size)
2358 {
2359         struct nft_rule_blob *blob;
2360
2361         if (size > INT_MAX)
2362                 return NULL;
2363
2364         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2365
2366         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2367         if (!blob)
2368                 return NULL;
2369
2370         blob->size = 0;
2371         nft_last_rule(chain, blob->data);
2372
2373         return blob;
2374 }
2375
2376 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2377                                     const struct nft_chain_hook *hook,
2378                                     struct nft_chain *chain)
2379 {
2380         ops->pf                 = family;
2381         ops->hooknum            = hook->num;
2382         ops->priority           = hook->priority;
2383         ops->priv               = chain;
2384         ops->hook               = hook->type->hooks[ops->hooknum];
2385         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2386 }
2387
2388 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2389                               struct nft_chain_hook *hook, u32 flags)
2390 {
2391         struct nft_chain *chain;
2392         struct nft_hook *h;
2393
2394         basechain->type = hook->type;
2395         INIT_LIST_HEAD(&basechain->hook_list);
2396         chain = &basechain->chain;
2397
2398         if (nft_base_chain_netdev(family, hook->num)) {
2399                 list_splice_init(&hook->list, &basechain->hook_list);
2400                 list_for_each_entry(h, &basechain->hook_list, list)
2401                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2402         }
2403         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2404
2405         chain->flags |= NFT_CHAIN_BASE | flags;
2406         basechain->policy = NF_ACCEPT;
2407         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2408             !nft_chain_offload_support(basechain)) {
2409                 list_splice_init(&basechain->hook_list, &hook->list);
2410                 return -EOPNOTSUPP;
2411         }
2412
2413         flow_block_init(&basechain->flow_block);
2414
2415         return 0;
2416 }
2417
2418 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2419 {
2420         int err;
2421
2422         err = rhltable_insert_key(&table->chains_ht, chain->name,
2423                                   &chain->rhlhead, nft_chain_ht_params);
2424         if (err)
2425                 return err;
2426
2427         list_add_tail_rcu(&chain->list, &table->chains);
2428
2429         return 0;
2430 }
2431
2432 static u64 chain_id;
2433
2434 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2435                               u8 policy, u32 flags,
2436                               struct netlink_ext_ack *extack)
2437 {
2438         const struct nlattr * const *nla = ctx->nla;
2439         struct nft_table *table = ctx->table;
2440         struct nft_base_chain *basechain;
2441         struct net *net = ctx->net;
2442         char name[NFT_NAME_MAXLEN];
2443         struct nft_rule_blob *blob;
2444         struct nft_trans *trans;
2445         struct nft_chain *chain;
2446         int err;
2447
2448         if (nla[NFTA_CHAIN_HOOK]) {
2449                 struct nft_stats __percpu *stats = NULL;
2450                 struct nft_chain_hook hook = {};
2451
2452                 if (flags & NFT_CHAIN_BINDING)
2453                         return -EOPNOTSUPP;
2454
2455                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2456                                            extack);
2457                 if (err < 0)
2458                         return err;
2459
2460                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2461                 if (basechain == NULL) {
2462                         nft_chain_release_hook(&hook);
2463                         return -ENOMEM;
2464                 }
2465                 chain = &basechain->chain;
2466
2467                 if (nla[NFTA_CHAIN_COUNTERS]) {
2468                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2469                         if (IS_ERR(stats)) {
2470                                 nft_chain_release_hook(&hook);
2471                                 kfree(basechain);
2472                                 return PTR_ERR(stats);
2473                         }
2474                         rcu_assign_pointer(basechain->stats, stats);
2475                 }
2476
2477                 err = nft_basechain_init(basechain, family, &hook, flags);
2478                 if (err < 0) {
2479                         nft_chain_release_hook(&hook);
2480                         kfree(basechain);
2481                         free_percpu(stats);
2482                         return err;
2483                 }
2484                 if (stats)
2485                         static_branch_inc(&nft_counters_enabled);
2486         } else {
2487                 if (flags & NFT_CHAIN_BASE)
2488                         return -EINVAL;
2489                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2490                         return -EOPNOTSUPP;
2491
2492                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2493                 if (chain == NULL)
2494                         return -ENOMEM;
2495
2496                 chain->flags = flags;
2497         }
2498         ctx->chain = chain;
2499
2500         INIT_LIST_HEAD(&chain->rules);
2501         chain->handle = nf_tables_alloc_handle(table);
2502         chain->table = table;
2503
2504         if (nla[NFTA_CHAIN_NAME]) {
2505                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2506         } else {
2507                 if (!(flags & NFT_CHAIN_BINDING)) {
2508                         err = -EINVAL;
2509                         goto err_destroy_chain;
2510                 }
2511
2512                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2513                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2514         }
2515
2516         if (!chain->name) {
2517                 err = -ENOMEM;
2518                 goto err_destroy_chain;
2519         }
2520
2521         if (nla[NFTA_CHAIN_USERDATA]) {
2522                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2523                 if (chain->udata == NULL) {
2524                         err = -ENOMEM;
2525                         goto err_destroy_chain;
2526                 }
2527                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2528         }
2529
2530         blob = nf_tables_chain_alloc_rules(chain, 0);
2531         if (!blob) {
2532                 err = -ENOMEM;
2533                 goto err_destroy_chain;
2534         }
2535
2536         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2537         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2538
2539         if (!nft_use_inc(&table->use)) {
2540                 err = -EMFILE;
2541                 goto err_destroy_chain;
2542         }
2543
2544         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2545         if (IS_ERR(trans)) {
2546                 err = PTR_ERR(trans);
2547                 goto err_trans;
2548         }
2549
2550         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2551         if (nft_is_base_chain(chain))
2552                 nft_trans_chain_policy(trans) = policy;
2553
2554         err = nft_chain_add(table, chain);
2555         if (err < 0)
2556                 goto err_chain_add;
2557
2558         /* This must be LAST to ensure no packets are walking over this chain. */
2559         err = nf_tables_register_hook(net, table, chain);
2560         if (err < 0)
2561                 goto err_register_hook;
2562
2563         return 0;
2564
2565 err_register_hook:
2566         nft_chain_del(chain);
2567 err_chain_add:
2568         nft_trans_destroy(trans);
2569 err_trans:
2570         nft_use_dec_restore(&table->use);
2571 err_destroy_chain:
2572         nf_tables_chain_destroy(ctx);
2573
2574         return err;
2575 }
2576
2577 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2578                               u32 flags, const struct nlattr *attr,
2579                               struct netlink_ext_ack *extack)
2580 {
2581         const struct nlattr * const *nla = ctx->nla;
2582         struct nft_base_chain *basechain = NULL;
2583         struct nft_table *table = ctx->table;
2584         struct nft_chain *chain = ctx->chain;
2585         struct nft_chain_hook hook = {};
2586         struct nft_stats *stats = NULL;
2587         struct nft_hook *h, *next;
2588         struct nf_hook_ops *ops;
2589         struct nft_trans *trans;
2590         bool unregister = false;
2591         int err;
2592
2593         if (chain->flags ^ flags)
2594                 return -EOPNOTSUPP;
2595
2596         INIT_LIST_HEAD(&hook.list);
2597
2598         if (nla[NFTA_CHAIN_HOOK]) {
2599                 if (!nft_is_base_chain(chain)) {
2600                         NL_SET_BAD_ATTR(extack, attr);
2601                         return -EEXIST;
2602                 }
2603
2604                 basechain = nft_base_chain(chain);
2605                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2606                                            ctx->family, flags, extack);
2607                 if (err < 0)
2608                         return err;
2609
2610                 if (basechain->type != hook.type) {
2611                         nft_chain_release_hook(&hook);
2612                         NL_SET_BAD_ATTR(extack, attr);
2613                         return -EEXIST;
2614                 }
2615
2616                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2617                         list_for_each_entry_safe(h, next, &hook.list, list) {
2618                                 h->ops.pf       = basechain->ops.pf;
2619                                 h->ops.hooknum  = basechain->ops.hooknum;
2620                                 h->ops.priority = basechain->ops.priority;
2621                                 h->ops.priv     = basechain->ops.priv;
2622                                 h->ops.hook     = basechain->ops.hook;
2623
2624                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2625                                         list_del(&h->list);
2626                                         kfree(h);
2627                                 }
2628                         }
2629                 } else {
2630                         ops = &basechain->ops;
2631                         if (ops->hooknum != hook.num ||
2632                             ops->priority != hook.priority) {
2633                                 nft_chain_release_hook(&hook);
2634                                 NL_SET_BAD_ATTR(extack, attr);
2635                                 return -EEXIST;
2636                         }
2637                 }
2638         }
2639
2640         if (nla[NFTA_CHAIN_HANDLE] &&
2641             nla[NFTA_CHAIN_NAME]) {
2642                 struct nft_chain *chain2;
2643
2644                 chain2 = nft_chain_lookup(ctx->net, table,
2645                                           nla[NFTA_CHAIN_NAME], genmask);
2646                 if (!IS_ERR(chain2)) {
2647                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2648                         err = -EEXIST;
2649                         goto err_hooks;
2650                 }
2651         }
2652
2653         if (table->flags & __NFT_TABLE_F_UPDATE &&
2654             !list_empty(&hook.list)) {
2655                 NL_SET_BAD_ATTR(extack, attr);
2656                 err = -EOPNOTSUPP;
2657                 goto err_hooks;
2658         }
2659
2660         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2661             nft_is_base_chain(chain) &&
2662             !list_empty(&hook.list)) {
2663                 basechain = nft_base_chain(chain);
2664                 ops = &basechain->ops;
2665
2666                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2667                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2668                         if (err < 0)
2669                                 goto err_hooks;
2670                 }
2671         }
2672
2673         unregister = true;
2674
2675         if (nla[NFTA_CHAIN_COUNTERS]) {
2676                 if (!nft_is_base_chain(chain)) {
2677                         err = -EOPNOTSUPP;
2678                         goto err_hooks;
2679                 }
2680
2681                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2682                 if (IS_ERR(stats)) {
2683                         err = PTR_ERR(stats);
2684                         goto err_hooks;
2685                 }
2686         }
2687
2688         err = -ENOMEM;
2689         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2690                                 sizeof(struct nft_trans_chain));
2691         if (trans == NULL)
2692                 goto err_trans;
2693
2694         nft_trans_chain_stats(trans) = stats;
2695         nft_trans_chain_update(trans) = true;
2696
2697         if (nla[NFTA_CHAIN_POLICY])
2698                 nft_trans_chain_policy(trans) = policy;
2699         else
2700                 nft_trans_chain_policy(trans) = -1;
2701
2702         if (nla[NFTA_CHAIN_HANDLE] &&
2703             nla[NFTA_CHAIN_NAME]) {
2704                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2705                 struct nft_trans *tmp;
2706                 char *name;
2707
2708                 err = -ENOMEM;
2709                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2710                 if (!name)
2711                         goto err_trans;
2712
2713                 err = -EEXIST;
2714                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2715                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2716                             tmp->ctx.table == table &&
2717                             nft_trans_chain_update(tmp) &&
2718                             nft_trans_chain_name(tmp) &&
2719                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2720                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2721                                 kfree(name);
2722                                 goto err_trans;
2723                         }
2724                 }
2725
2726                 nft_trans_chain_name(trans) = name;
2727         }
2728
2729         nft_trans_basechain(trans) = basechain;
2730         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2731         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2732         if (nla[NFTA_CHAIN_HOOK])
2733                 module_put(hook.type->owner);
2734
2735         nft_trans_commit_list_add_tail(ctx->net, trans);
2736
2737         return 0;
2738
2739 err_trans:
2740         free_percpu(stats);
2741         kfree(trans);
2742 err_hooks:
2743         if (nla[NFTA_CHAIN_HOOK]) {
2744                 list_for_each_entry_safe(h, next, &hook.list, list) {
2745                         if (unregister)
2746                                 nf_unregister_net_hook(ctx->net, &h->ops);
2747                         list_del(&h->list);
2748                         kfree_rcu(h, rcu);
2749                 }
2750                 module_put(hook.type->owner);
2751         }
2752
2753         return err;
2754 }
2755
2756 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2757                                                const struct nft_table *table,
2758                                                const struct nlattr *nla, u8 genmask)
2759 {
2760         struct nftables_pernet *nft_net = nft_pernet(net);
2761         u32 id = ntohl(nla_get_be32(nla));
2762         struct nft_trans *trans;
2763
2764         list_for_each_entry(trans, &nft_net->commit_list, list) {
2765                 struct nft_chain *chain = trans->ctx.chain;
2766
2767                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2768                     chain->table == table &&
2769                     id == nft_trans_chain_id(trans) &&
2770                     nft_active_genmask(chain, genmask))
2771                         return chain;
2772         }
2773         return ERR_PTR(-ENOENT);
2774 }
2775
2776 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2777                               const struct nlattr * const nla[])
2778 {
2779         struct nftables_pernet *nft_net = nft_pernet(info->net);
2780         struct netlink_ext_ack *extack = info->extack;
2781         u8 genmask = nft_genmask_next(info->net);
2782         u8 family = info->nfmsg->nfgen_family;
2783         struct nft_chain *chain = NULL;
2784         struct net *net = info->net;
2785         const struct nlattr *attr;
2786         struct nft_table *table;
2787         u8 policy = NF_ACCEPT;
2788         struct nft_ctx ctx;
2789         u64 handle = 0;
2790         u32 flags = 0;
2791
2792         lockdep_assert_held(&nft_net->commit_mutex);
2793
2794         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2795                                  NETLINK_CB(skb).portid);
2796         if (IS_ERR(table)) {
2797                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2798                 return PTR_ERR(table);
2799         }
2800
2801         chain = NULL;
2802         attr = nla[NFTA_CHAIN_NAME];
2803
2804         if (nla[NFTA_CHAIN_HANDLE]) {
2805                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2806                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2807                 if (IS_ERR(chain)) {
2808                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2809                         return PTR_ERR(chain);
2810                 }
2811                 attr = nla[NFTA_CHAIN_HANDLE];
2812         } else if (nla[NFTA_CHAIN_NAME]) {
2813                 chain = nft_chain_lookup(net, table, attr, genmask);
2814                 if (IS_ERR(chain)) {
2815                         if (PTR_ERR(chain) != -ENOENT) {
2816                                 NL_SET_BAD_ATTR(extack, attr);
2817                                 return PTR_ERR(chain);
2818                         }
2819                         chain = NULL;
2820                 }
2821         } else if (!nla[NFTA_CHAIN_ID]) {
2822                 return -EINVAL;
2823         }
2824
2825         if (nla[NFTA_CHAIN_POLICY]) {
2826                 if (chain != NULL &&
2827                     !nft_is_base_chain(chain)) {
2828                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2829                         return -EOPNOTSUPP;
2830                 }
2831
2832                 if (chain == NULL &&
2833                     nla[NFTA_CHAIN_HOOK] == NULL) {
2834                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2835                         return -EOPNOTSUPP;
2836                 }
2837
2838                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2839                 switch (policy) {
2840                 case NF_DROP:
2841                 case NF_ACCEPT:
2842                         break;
2843                 default:
2844                         return -EINVAL;
2845                 }
2846         }
2847
2848         if (nla[NFTA_CHAIN_FLAGS])
2849                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2850         else if (chain)
2851                 flags = chain->flags;
2852
2853         if (flags & ~NFT_CHAIN_FLAGS)
2854                 return -EOPNOTSUPP;
2855
2856         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2857
2858         if (chain != NULL) {
2859                 if (chain->flags & NFT_CHAIN_BINDING)
2860                         return -EINVAL;
2861
2862                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2863                         NL_SET_BAD_ATTR(extack, attr);
2864                         return -EEXIST;
2865                 }
2866                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2867                         return -EOPNOTSUPP;
2868
2869                 flags |= chain->flags & NFT_CHAIN_BASE;
2870                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2871                                           extack);
2872         }
2873
2874         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2875 }
2876
2877 static int nft_delchain_hook(struct nft_ctx *ctx,
2878                              struct nft_base_chain *basechain,
2879                              struct netlink_ext_ack *extack)
2880 {
2881         const struct nft_chain *chain = &basechain->chain;
2882         const struct nlattr * const *nla = ctx->nla;
2883         struct nft_chain_hook chain_hook = {};
2884         struct nft_hook *this, *hook;
2885         LIST_HEAD(chain_del_list);
2886         struct nft_trans *trans;
2887         int err;
2888
2889         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
2890                 return -EOPNOTSUPP;
2891
2892         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2893                                    ctx->family, chain->flags, extack);
2894         if (err < 0)
2895                 return err;
2896
2897         list_for_each_entry(this, &chain_hook.list, list) {
2898                 hook = nft_hook_list_find(&basechain->hook_list, this);
2899                 if (!hook) {
2900                         err = -ENOENT;
2901                         goto err_chain_del_hook;
2902                 }
2903                 list_move(&hook->list, &chain_del_list);
2904         }
2905
2906         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2907                                 sizeof(struct nft_trans_chain));
2908         if (!trans) {
2909                 err = -ENOMEM;
2910                 goto err_chain_del_hook;
2911         }
2912
2913         nft_trans_basechain(trans) = basechain;
2914         nft_trans_chain_update(trans) = true;
2915         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2916         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2917         nft_chain_release_hook(&chain_hook);
2918
2919         nft_trans_commit_list_add_tail(ctx->net, trans);
2920
2921         return 0;
2922
2923 err_chain_del_hook:
2924         list_splice(&chain_del_list, &basechain->hook_list);
2925         nft_chain_release_hook(&chain_hook);
2926
2927         return err;
2928 }
2929
2930 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2931                               const struct nlattr * const nla[])
2932 {
2933         struct netlink_ext_ack *extack = info->extack;
2934         u8 genmask = nft_genmask_next(info->net);
2935         u8 family = info->nfmsg->nfgen_family;
2936         struct net *net = info->net;
2937         const struct nlattr *attr;
2938         struct nft_table *table;
2939         struct nft_chain *chain;
2940         struct nft_rule *rule;
2941         struct nft_ctx ctx;
2942         u64 handle;
2943         u32 use;
2944         int err;
2945
2946         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2947                                  NETLINK_CB(skb).portid);
2948         if (IS_ERR(table)) {
2949                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2950                 return PTR_ERR(table);
2951         }
2952
2953         if (nla[NFTA_CHAIN_HANDLE]) {
2954                 attr = nla[NFTA_CHAIN_HANDLE];
2955                 handle = be64_to_cpu(nla_get_be64(attr));
2956                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2957         } else {
2958                 attr = nla[NFTA_CHAIN_NAME];
2959                 chain = nft_chain_lookup(net, table, attr, genmask);
2960         }
2961         if (IS_ERR(chain)) {
2962                 if (PTR_ERR(chain) == -ENOENT &&
2963                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2964                         return 0;
2965
2966                 NL_SET_BAD_ATTR(extack, attr);
2967                 return PTR_ERR(chain);
2968         }
2969
2970         if (nft_chain_binding(chain))
2971                 return -EOPNOTSUPP;
2972
2973         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2974
2975         if (nla[NFTA_CHAIN_HOOK]) {
2976                 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN ||
2977                     chain->flags & NFT_CHAIN_HW_OFFLOAD)
2978                         return -EOPNOTSUPP;
2979
2980                 if (nft_is_base_chain(chain)) {
2981                         struct nft_base_chain *basechain = nft_base_chain(chain);
2982
2983                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2984                                 return nft_delchain_hook(&ctx, basechain, extack);
2985                 }
2986         }
2987
2988         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2989             chain->use > 0)
2990                 return -EBUSY;
2991
2992         use = chain->use;
2993         list_for_each_entry(rule, &chain->rules, list) {
2994                 if (!nft_is_active_next(net, rule))
2995                         continue;
2996                 use--;
2997
2998                 err = nft_delrule(&ctx, rule);
2999                 if (err < 0)
3000                         return err;
3001         }
3002
3003         /* There are rules and elements that are still holding references to us,
3004          * we cannot do a recursive removal in this case.
3005          */
3006         if (use > 0) {
3007                 NL_SET_BAD_ATTR(extack, attr);
3008                 return -EBUSY;
3009         }
3010
3011         return nft_delchain(&ctx);
3012 }
3013
3014 /*
3015  * Expressions
3016  */
3017
3018 /**
3019  *      nft_register_expr - register nf_tables expr type
3020  *      @type: expr type
3021  *
3022  *      Registers the expr type for use with nf_tables. Returns zero on
3023  *      success or a negative errno code otherwise.
3024  */
3025 int nft_register_expr(struct nft_expr_type *type)
3026 {
3027         if (WARN_ON_ONCE(type->maxattr > NFT_EXPR_MAXATTR))
3028                 return -ENOMEM;
3029
3030         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3031         if (type->family == NFPROTO_UNSPEC)
3032                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
3033         else
3034                 list_add_rcu(&type->list, &nf_tables_expressions);
3035         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3036         return 0;
3037 }
3038 EXPORT_SYMBOL_GPL(nft_register_expr);
3039
3040 /**
3041  *      nft_unregister_expr - unregister nf_tables expr type
3042  *      @type: expr type
3043  *
3044  *      Unregisters the expr typefor use with nf_tables.
3045  */
3046 void nft_unregister_expr(struct nft_expr_type *type)
3047 {
3048         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3049         list_del_rcu(&type->list);
3050         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3051 }
3052 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3053
3054 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3055                                                        struct nlattr *nla)
3056 {
3057         const struct nft_expr_type *type, *candidate = NULL;
3058
3059         list_for_each_entry(type, &nf_tables_expressions, list) {
3060                 if (!nla_strcmp(nla, type->name)) {
3061                         if (!type->family && !candidate)
3062                                 candidate = type;
3063                         else if (type->family == family)
3064                                 candidate = type;
3065                 }
3066         }
3067         return candidate;
3068 }
3069
3070 #ifdef CONFIG_MODULES
3071 static int nft_expr_type_request_module(struct net *net, u8 family,
3072                                         struct nlattr *nla)
3073 {
3074         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3075                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3076                 return -EAGAIN;
3077
3078         return 0;
3079 }
3080 #endif
3081
3082 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3083                                                      u8 family,
3084                                                      struct nlattr *nla)
3085 {
3086         const struct nft_expr_type *type;
3087
3088         if (nla == NULL)
3089                 return ERR_PTR(-EINVAL);
3090
3091         type = __nft_expr_type_get(family, nla);
3092         if (type != NULL && try_module_get(type->owner))
3093                 return type;
3094
3095         lockdep_nfnl_nft_mutex_not_held();
3096 #ifdef CONFIG_MODULES
3097         if (type == NULL) {
3098                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3099                         return ERR_PTR(-EAGAIN);
3100
3101                 if (nft_request_module(net, "nft-expr-%.*s",
3102                                        nla_len(nla),
3103                                        (char *)nla_data(nla)) == -EAGAIN)
3104                         return ERR_PTR(-EAGAIN);
3105         }
3106 #endif
3107         return ERR_PTR(-ENOENT);
3108 }
3109
3110 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3111         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3112                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3113         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3114 };
3115
3116 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3117                                     const struct nft_expr *expr, bool reset)
3118 {
3119         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3120                 goto nla_put_failure;
3121
3122         if (expr->ops->dump) {
3123                 struct nlattr *data = nla_nest_start_noflag(skb,
3124                                                             NFTA_EXPR_DATA);
3125                 if (data == NULL)
3126                         goto nla_put_failure;
3127                 if (expr->ops->dump(skb, expr, reset) < 0)
3128                         goto nla_put_failure;
3129                 nla_nest_end(skb, data);
3130         }
3131
3132         return skb->len;
3133
3134 nla_put_failure:
3135         return -1;
3136 };
3137
3138 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3139                   const struct nft_expr *expr, bool reset)
3140 {
3141         struct nlattr *nest;
3142
3143         nest = nla_nest_start_noflag(skb, attr);
3144         if (!nest)
3145                 goto nla_put_failure;
3146         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3147                 goto nla_put_failure;
3148         nla_nest_end(skb, nest);
3149         return 0;
3150
3151 nla_put_failure:
3152         return -1;
3153 }
3154
3155 struct nft_expr_info {
3156         const struct nft_expr_ops       *ops;
3157         const struct nlattr             *attr;
3158         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3159 };
3160
3161 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3162                                 const struct nlattr *nla,
3163                                 struct nft_expr_info *info)
3164 {
3165         const struct nft_expr_type *type;
3166         const struct nft_expr_ops *ops;
3167         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3168         int err;
3169
3170         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3171                                           nft_expr_policy, NULL);
3172         if (err < 0)
3173                 return err;
3174
3175         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3176         if (IS_ERR(type))
3177                 return PTR_ERR(type);
3178
3179         if (tb[NFTA_EXPR_DATA]) {
3180                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3181                                                   tb[NFTA_EXPR_DATA],
3182                                                   type->policy, NULL);
3183                 if (err < 0)
3184                         goto err1;
3185         } else
3186                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3187
3188         if (type->select_ops != NULL) {
3189                 ops = type->select_ops(ctx,
3190                                        (const struct nlattr * const *)info->tb);
3191                 if (IS_ERR(ops)) {
3192                         err = PTR_ERR(ops);
3193 #ifdef CONFIG_MODULES
3194                         if (err == -EAGAIN)
3195                                 if (nft_expr_type_request_module(ctx->net,
3196                                                                  ctx->family,
3197                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3198                                         err = -ENOENT;
3199 #endif
3200                         goto err1;
3201                 }
3202         } else
3203                 ops = type->ops;
3204
3205         info->attr = nla;
3206         info->ops = ops;
3207
3208         return 0;
3209
3210 err1:
3211         module_put(type->owner);
3212         return err;
3213 }
3214
3215 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3216                          struct nft_expr_info *info)
3217 {
3218         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3219         const struct nft_expr_type *type;
3220         int err;
3221
3222         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3223                                           nft_expr_policy, NULL);
3224         if (err < 0)
3225                 return err;
3226
3227         if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3228                 return -EINVAL;
3229
3230         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3231         if (!type)
3232                 return -ENOENT;
3233
3234         if (!type->inner_ops)
3235                 return -EOPNOTSUPP;
3236
3237         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3238                                           tb[NFTA_EXPR_DATA],
3239                                           type->policy, NULL);
3240         if (err < 0)
3241                 goto err_nla_parse;
3242
3243         info->attr = nla;
3244         info->ops = type->inner_ops;
3245
3246         return 0;
3247
3248 err_nla_parse:
3249         return err;
3250 }
3251
3252 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3253                              const struct nft_expr_info *expr_info,
3254                              struct nft_expr *expr)
3255 {
3256         const struct nft_expr_ops *ops = expr_info->ops;
3257         int err;
3258
3259         expr->ops = ops;
3260         if (ops->init) {
3261                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3262                 if (err < 0)
3263                         goto err1;
3264         }
3265
3266         return 0;
3267 err1:
3268         expr->ops = NULL;
3269         return err;
3270 }
3271
3272 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3273                                    struct nft_expr *expr)
3274 {
3275         const struct nft_expr_type *type = expr->ops->type;
3276
3277         if (expr->ops->destroy)
3278                 expr->ops->destroy(ctx, expr);
3279         module_put(type->owner);
3280 }
3281
3282 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3283                                       const struct nlattr *nla)
3284 {
3285         struct nft_expr_info expr_info;
3286         struct nft_expr *expr;
3287         struct module *owner;
3288         int err;
3289
3290         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3291         if (err < 0)
3292                 goto err_expr_parse;
3293
3294         err = -EOPNOTSUPP;
3295         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3296                 goto err_expr_stateful;
3297
3298         err = -ENOMEM;
3299         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3300         if (expr == NULL)
3301                 goto err_expr_stateful;
3302
3303         err = nf_tables_newexpr(ctx, &expr_info, expr);
3304         if (err < 0)
3305                 goto err_expr_new;
3306
3307         return expr;
3308 err_expr_new:
3309         kfree(expr);
3310 err_expr_stateful:
3311         owner = expr_info.ops->type->owner;
3312         if (expr_info.ops->type->release_ops)
3313                 expr_info.ops->type->release_ops(expr_info.ops);
3314
3315         module_put(owner);
3316 err_expr_parse:
3317         return ERR_PTR(err);
3318 }
3319
3320 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3321 {
3322         int err;
3323
3324         if (WARN_ON_ONCE(!src->ops->clone))
3325                 return -EINVAL;
3326
3327         dst->ops = src->ops;
3328         err = src->ops->clone(dst, src);
3329         if (err < 0)
3330                 return err;
3331
3332         __module_get(src->ops->type->owner);
3333
3334         return 0;
3335 }
3336
3337 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3338 {
3339         nf_tables_expr_destroy(ctx, expr);
3340         kfree(expr);
3341 }
3342
3343 /*
3344  * Rules
3345  */
3346
3347 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3348                                           u64 handle)
3349 {
3350         struct nft_rule *rule;
3351
3352         // FIXME: this sucks
3353         list_for_each_entry_rcu(rule, &chain->rules, list) {
3354                 if (handle == rule->handle)
3355                         return rule;
3356         }
3357
3358         return ERR_PTR(-ENOENT);
3359 }
3360
3361 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3362                                         const struct nlattr *nla)
3363 {
3364         if (nla == NULL)
3365                 return ERR_PTR(-EINVAL);
3366
3367         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3368 }
3369
3370 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3371         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3372                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3373         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3374                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3375         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3376         [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3377         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3378         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3379         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3380                                     .len = NFT_USERDATA_MAXLEN },
3381         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3382         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3383         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3384 };
3385
3386 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3387                                     u32 portid, u32 seq, int event,
3388                                     u32 flags, int family,
3389                                     const struct nft_table *table,
3390                                     const struct nft_chain *chain,
3391                                     const struct nft_rule *rule, u64 handle,
3392                                     bool reset)
3393 {
3394         struct nlmsghdr *nlh;
3395         const struct nft_expr *expr, *next;
3396         struct nlattr *list;
3397         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3398
3399         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3400                            nft_base_seq(net));
3401         if (!nlh)
3402                 goto nla_put_failure;
3403
3404         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3405                 goto nla_put_failure;
3406         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3407                 goto nla_put_failure;
3408         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3409                          NFTA_RULE_PAD))
3410                 goto nla_put_failure;
3411
3412         if (event != NFT_MSG_DELRULE && handle) {
3413                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3414                                  NFTA_RULE_PAD))
3415                         goto nla_put_failure;
3416         }
3417
3418         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3419                 nft_flow_rule_stats(chain, rule);
3420
3421         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3422         if (list == NULL)
3423                 goto nla_put_failure;
3424         nft_rule_for_each_expr(expr, next, rule) {
3425                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3426                         goto nla_put_failure;
3427         }
3428         nla_nest_end(skb, list);
3429
3430         if (rule->udata) {
3431                 struct nft_userdata *udata = nft_userdata(rule);
3432                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3433                             udata->data) < 0)
3434                         goto nla_put_failure;
3435         }
3436
3437         nlmsg_end(skb, nlh);
3438         return 0;
3439
3440 nla_put_failure:
3441         nlmsg_trim(skb, nlh);
3442         return -1;
3443 }
3444
3445 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3446                                   const struct nft_rule *rule, int event)
3447 {
3448         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3449         const struct nft_rule *prule;
3450         struct sk_buff *skb;
3451         u64 handle = 0;
3452         u16 flags = 0;
3453         int err;
3454
3455         if (!ctx->report &&
3456             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3457                 return;
3458
3459         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3460         if (skb == NULL)
3461                 goto err;
3462
3463         if (event == NFT_MSG_NEWRULE &&
3464             !list_is_first(&rule->list, &ctx->chain->rules) &&
3465             !list_is_last(&rule->list, &ctx->chain->rules)) {
3466                 prule = list_prev_entry(rule, list);
3467                 handle = prule->handle;
3468         }
3469         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3470                 flags |= NLM_F_APPEND;
3471         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3472                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3473
3474         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3475                                        event, flags, ctx->family, ctx->table,
3476                                        ctx->chain, rule, handle, false);
3477         if (err < 0) {
3478                 kfree_skb(skb);
3479                 goto err;
3480         }
3481
3482         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3483         return;
3484 err:
3485         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3486 }
3487
3488 static void audit_log_rule_reset(const struct nft_table *table,
3489                                  unsigned int base_seq,
3490                                  unsigned int nentries)
3491 {
3492         char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3493                               table->name, base_seq);
3494
3495         audit_log_nfcfg(buf, table->family, nentries,
3496                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3497         kfree(buf);
3498 }
3499
3500 struct nft_rule_dump_ctx {
3501         unsigned int s_idx;
3502         char *table;
3503         char *chain;
3504         bool reset;
3505 };
3506
3507 static int __nf_tables_dump_rules(struct sk_buff *skb,
3508                                   unsigned int *idx,
3509                                   struct netlink_callback *cb,
3510                                   const struct nft_table *table,
3511                                   const struct nft_chain *chain)
3512 {
3513         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3514         struct net *net = sock_net(skb->sk);
3515         const struct nft_rule *rule, *prule;
3516         unsigned int entries = 0;
3517         int ret = 0;
3518         u64 handle;
3519
3520         prule = NULL;
3521         list_for_each_entry_rcu(rule, &chain->rules, list) {
3522                 if (!nft_is_active(net, rule))
3523                         goto cont_skip;
3524                 if (*idx < ctx->s_idx)
3525                         goto cont;
3526                 if (prule)
3527                         handle = prule->handle;
3528                 else
3529                         handle = 0;
3530
3531                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3532                                         cb->nlh->nlmsg_seq,
3533                                         NFT_MSG_NEWRULE,
3534                                         NLM_F_MULTI | NLM_F_APPEND,
3535                                         table->family,
3536                                         table, chain, rule, handle, ctx->reset) < 0) {
3537                         ret = 1;
3538                         break;
3539                 }
3540                 entries++;
3541                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3542 cont:
3543                 prule = rule;
3544 cont_skip:
3545                 (*idx)++;
3546         }
3547
3548         if (ctx->reset && entries)
3549                 audit_log_rule_reset(table, cb->seq, entries);
3550
3551         return ret;
3552 }
3553
3554 static int nf_tables_dump_rules(struct sk_buff *skb,
3555                                 struct netlink_callback *cb)
3556 {
3557         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3558         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3559         struct nft_table *table;
3560         const struct nft_chain *chain;
3561         unsigned int idx = 0;
3562         struct net *net = sock_net(skb->sk);
3563         int family = nfmsg->nfgen_family;
3564         struct nftables_pernet *nft_net;
3565
3566         rcu_read_lock();
3567         nft_net = nft_pernet(net);
3568         cb->seq = READ_ONCE(nft_net->base_seq);
3569
3570         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3571                 if (family != NFPROTO_UNSPEC && family != table->family)
3572                         continue;
3573
3574                 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3575                         continue;
3576
3577                 if (ctx->table && ctx->chain) {
3578                         struct rhlist_head *list, *tmp;
3579
3580                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3581                                                nft_chain_ht_params);
3582                         if (!list)
3583                                 goto done;
3584
3585                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3586                                 if (!nft_is_active(net, chain))
3587                                         continue;
3588                                 __nf_tables_dump_rules(skb, &idx,
3589                                                        cb, table, chain);
3590                                 break;
3591                         }
3592                         goto done;
3593                 }
3594
3595                 list_for_each_entry_rcu(chain, &table->chains, list) {
3596                         if (__nf_tables_dump_rules(skb, &idx,
3597                                                    cb, table, chain))
3598                                 goto done;
3599                 }
3600
3601                 if (ctx->table)
3602                         break;
3603         }
3604 done:
3605         rcu_read_unlock();
3606
3607         ctx->s_idx = idx;
3608         return skb->len;
3609 }
3610
3611 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3612                                      struct netlink_callback *cb)
3613 {
3614         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3615         int ret;
3616
3617         /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3618          * do not underrun counters and quotas. The commit_mutex is used for
3619          * the lack a better lock, this is not transaction path.
3620          */
3621         mutex_lock(&nft_net->commit_mutex);
3622         ret = nf_tables_dump_rules(skb, cb);
3623         mutex_unlock(&nft_net->commit_mutex);
3624
3625         return ret;
3626 }
3627
3628 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3629 {
3630         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3631         const struct nlattr * const *nla = cb->data;
3632
3633         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3634
3635         if (nla[NFTA_RULE_TABLE]) {
3636                 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3637                 if (!ctx->table)
3638                         return -ENOMEM;
3639         }
3640         if (nla[NFTA_RULE_CHAIN]) {
3641                 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3642                 if (!ctx->chain) {
3643                         kfree(ctx->table);
3644                         return -ENOMEM;
3645                 }
3646         }
3647         return 0;
3648 }
3649
3650 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3651 {
3652         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3653
3654         ctx->reset = true;
3655
3656         return nf_tables_dump_rules_start(cb);
3657 }
3658
3659 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3660 {
3661         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3662
3663         kfree(ctx->table);
3664         kfree(ctx->chain);
3665         return 0;
3666 }
3667
3668 /* called with rcu_read_lock held */
3669 static struct sk_buff *
3670 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3671                          const struct nlattr * const nla[], bool reset)
3672 {
3673         struct netlink_ext_ack *extack = info->extack;
3674         u8 genmask = nft_genmask_cur(info->net);
3675         u8 family = info->nfmsg->nfgen_family;
3676         const struct nft_chain *chain;
3677         const struct nft_rule *rule;
3678         struct net *net = info->net;
3679         struct nft_table *table;
3680         struct sk_buff *skb2;
3681         int err;
3682
3683         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3684         if (IS_ERR(table)) {
3685                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3686                 return ERR_CAST(table);
3687         }
3688
3689         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3690         if (IS_ERR(chain)) {
3691                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3692                 return ERR_CAST(chain);
3693         }
3694
3695         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3696         if (IS_ERR(rule)) {
3697                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3698                 return ERR_CAST(rule);
3699         }
3700
3701         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3702         if (!skb2)
3703                 return ERR_PTR(-ENOMEM);
3704
3705         err = nf_tables_fill_rule_info(skb2, net, portid,
3706                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3707                                        family, table, chain, rule, 0, reset);
3708         if (err < 0) {
3709                 kfree_skb(skb2);
3710                 return ERR_PTR(err);
3711         }
3712
3713         return skb2;
3714 }
3715
3716 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3717                              const struct nlattr * const nla[])
3718 {
3719         u32 portid = NETLINK_CB(skb).portid;
3720         struct net *net = info->net;
3721         struct sk_buff *skb2;
3722
3723         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3724                 struct netlink_dump_control c = {
3725                         .start= nf_tables_dump_rules_start,
3726                         .dump = nf_tables_dump_rules,
3727                         .done = nf_tables_dump_rules_done,
3728                         .module = THIS_MODULE,
3729                         .data = (void *)nla,
3730                 };
3731
3732                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3733         }
3734
3735         skb2 = nf_tables_getrule_single(portid, info, nla, false);
3736         if (IS_ERR(skb2))
3737                 return PTR_ERR(skb2);
3738
3739         return nfnetlink_unicast(skb2, net, portid);
3740 }
3741
3742 static int nf_tables_getrule_reset(struct sk_buff *skb,
3743                                    const struct nfnl_info *info,
3744                                    const struct nlattr * const nla[])
3745 {
3746         struct nftables_pernet *nft_net = nft_pernet(info->net);
3747         u32 portid = NETLINK_CB(skb).portid;
3748         struct net *net = info->net;
3749         struct sk_buff *skb2;
3750         char *buf;
3751
3752         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3753                 struct netlink_dump_control c = {
3754                         .start= nf_tables_dumpreset_rules_start,
3755                         .dump = nf_tables_dumpreset_rules,
3756                         .done = nf_tables_dump_rules_done,
3757                         .module = THIS_MODULE,
3758                         .data = (void *)nla,
3759                 };
3760
3761                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3762         }
3763
3764         if (!try_module_get(THIS_MODULE))
3765                 return -EINVAL;
3766         rcu_read_unlock();
3767         mutex_lock(&nft_net->commit_mutex);
3768         skb2 = nf_tables_getrule_single(portid, info, nla, true);
3769         mutex_unlock(&nft_net->commit_mutex);
3770         rcu_read_lock();
3771         module_put(THIS_MODULE);
3772
3773         if (IS_ERR(skb2))
3774                 return PTR_ERR(skb2);
3775
3776         buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3777                         nla_len(nla[NFTA_RULE_TABLE]),
3778                         (char *)nla_data(nla[NFTA_RULE_TABLE]),
3779                         nft_net->base_seq);
3780         audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3781                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3782         kfree(buf);
3783
3784         return nfnetlink_unicast(skb2, net, portid);
3785 }
3786
3787 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3788 {
3789         struct nft_expr *expr, *next;
3790
3791         /*
3792          * Careful: some expressions might not be initialized in case this
3793          * is called on error from nf_tables_newrule().
3794          */
3795         expr = nft_expr_first(rule);
3796         while (nft_expr_more(rule, expr)) {
3797                 next = nft_expr_next(expr);
3798                 nf_tables_expr_destroy(ctx, expr);
3799                 expr = next;
3800         }
3801         kfree(rule);
3802 }
3803
3804 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3805 {
3806         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3807         nf_tables_rule_destroy(ctx, rule);
3808 }
3809
3810 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3811 {
3812         struct nft_expr *expr, *last;
3813         const struct nft_data *data;
3814         struct nft_rule *rule;
3815         int err;
3816
3817         if (ctx->level == NFT_JUMP_STACK_SIZE)
3818                 return -EMLINK;
3819
3820         list_for_each_entry(rule, &chain->rules, list) {
3821                 if (fatal_signal_pending(current))
3822                         return -EINTR;
3823
3824                 if (!nft_is_active_next(ctx->net, rule))
3825                         continue;
3826
3827                 nft_rule_for_each_expr(expr, last, rule) {
3828                         if (!expr->ops->validate)
3829                                 continue;
3830
3831                         err = expr->ops->validate(ctx, expr, &data);
3832                         if (err < 0)
3833                                 return err;
3834                 }
3835         }
3836
3837         return 0;
3838 }
3839 EXPORT_SYMBOL_GPL(nft_chain_validate);
3840
3841 static int nft_table_validate(struct net *net, const struct nft_table *table)
3842 {
3843         struct nft_chain *chain;
3844         struct nft_ctx ctx = {
3845                 .net    = net,
3846                 .family = table->family,
3847         };
3848         int err;
3849
3850         list_for_each_entry(chain, &table->chains, list) {
3851                 if (!nft_is_base_chain(chain))
3852                         continue;
3853
3854                 ctx.chain = chain;
3855                 err = nft_chain_validate(&ctx, chain);
3856                 if (err < 0)
3857                         return err;
3858
3859                 cond_resched();
3860         }
3861
3862         return 0;
3863 }
3864
3865 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3866                          const struct nft_set_iter *iter,
3867                          struct nft_elem_priv *elem_priv)
3868 {
3869         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
3870         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3871         const struct nft_data *data;
3872         int err;
3873
3874         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3875             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3876                 return 0;
3877
3878         data = nft_set_ext_data(ext);
3879         switch (data->verdict.code) {
3880         case NFT_JUMP:
3881         case NFT_GOTO:
3882                 pctx->level++;
3883                 err = nft_chain_validate(ctx, data->verdict.chain);
3884                 if (err < 0)
3885                         return err;
3886                 pctx->level--;
3887                 break;
3888         default:
3889                 break;
3890         }
3891
3892         return 0;
3893 }
3894
3895 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3896 {
3897         u8 genmask = nft_genmask_next(ctx->net);
3898         struct nft_set_elem_catchall *catchall;
3899         struct nft_set_ext *ext;
3900         int ret = 0;
3901
3902         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3903                 ext = nft_set_elem_ext(set, catchall->elem);
3904                 if (!nft_set_elem_active(ext, genmask))
3905                         continue;
3906
3907                 ret = nft_setelem_validate(ctx, set, NULL, catchall->elem);
3908                 if (ret < 0)
3909                         return ret;
3910         }
3911
3912         return ret;
3913 }
3914
3915 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3916                                              const struct nft_chain *chain,
3917                                              const struct nlattr *nla);
3918
3919 #define NFT_RULE_MAXEXPRS       128
3920
3921 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3922                              const struct nlattr * const nla[])
3923 {
3924         struct nftables_pernet *nft_net = nft_pernet(info->net);
3925         struct netlink_ext_ack *extack = info->extack;
3926         unsigned int size, i, n, ulen = 0, usize = 0;
3927         u8 genmask = nft_genmask_next(info->net);
3928         struct nft_rule *rule, *old_rule = NULL;
3929         struct nft_expr_info *expr_info = NULL;
3930         u8 family = info->nfmsg->nfgen_family;
3931         struct nft_flow_rule *flow = NULL;
3932         struct net *net = info->net;
3933         struct nft_userdata *udata;
3934         struct nft_table *table;
3935         struct nft_chain *chain;
3936         struct nft_trans *trans;
3937         u64 handle, pos_handle;
3938         struct nft_expr *expr;
3939         struct nft_ctx ctx;
3940         struct nlattr *tmp;
3941         int err, rem;
3942
3943         lockdep_assert_held(&nft_net->commit_mutex);
3944
3945         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3946                                  NETLINK_CB(skb).portid);
3947         if (IS_ERR(table)) {
3948                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3949                 return PTR_ERR(table);
3950         }
3951
3952         if (nla[NFTA_RULE_CHAIN]) {
3953                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3954                                          genmask);
3955                 if (IS_ERR(chain)) {
3956                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3957                         return PTR_ERR(chain);
3958                 }
3959
3960         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3961                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3962                                               genmask);
3963                 if (IS_ERR(chain)) {
3964                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3965                         return PTR_ERR(chain);
3966                 }
3967         } else {
3968                 return -EINVAL;
3969         }
3970
3971         if (nft_chain_is_bound(chain))
3972                 return -EOPNOTSUPP;
3973
3974         if (nla[NFTA_RULE_HANDLE]) {
3975                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3976                 rule = __nft_rule_lookup(chain, handle);
3977                 if (IS_ERR(rule)) {
3978                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3979                         return PTR_ERR(rule);
3980                 }
3981
3982                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3983                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3984                         return -EEXIST;
3985                 }
3986                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3987                         old_rule = rule;
3988                 else
3989                         return -EOPNOTSUPP;
3990         } else {
3991                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3992                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3993                         return -EINVAL;
3994                 handle = nf_tables_alloc_handle(table);
3995
3996                 if (nla[NFTA_RULE_POSITION]) {
3997                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3998                         old_rule = __nft_rule_lookup(chain, pos_handle);
3999                         if (IS_ERR(old_rule)) {
4000                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
4001                                 return PTR_ERR(old_rule);
4002                         }
4003                 } else if (nla[NFTA_RULE_POSITION_ID]) {
4004                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
4005                         if (IS_ERR(old_rule)) {
4006                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
4007                                 return PTR_ERR(old_rule);
4008                         }
4009                 }
4010         }
4011
4012         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4013
4014         n = 0;
4015         size = 0;
4016         if (nla[NFTA_RULE_EXPRESSIONS]) {
4017                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
4018                                            sizeof(struct nft_expr_info),
4019                                            GFP_KERNEL);
4020                 if (!expr_info)
4021                         return -ENOMEM;
4022
4023                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
4024                         err = -EINVAL;
4025                         if (nla_type(tmp) != NFTA_LIST_ELEM)
4026                                 goto err_release_expr;
4027                         if (n == NFT_RULE_MAXEXPRS)
4028                                 goto err_release_expr;
4029                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
4030                         if (err < 0) {
4031                                 NL_SET_BAD_ATTR(extack, tmp);
4032                                 goto err_release_expr;
4033                         }
4034                         size += expr_info[n].ops->size;
4035                         n++;
4036                 }
4037         }
4038         /* Check for overflow of dlen field */
4039         err = -EFBIG;
4040         if (size >= 1 << 12)
4041                 goto err_release_expr;
4042
4043         if (nla[NFTA_RULE_USERDATA]) {
4044                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
4045                 if (ulen > 0)
4046                         usize = sizeof(struct nft_userdata) + ulen;
4047         }
4048
4049         err = -ENOMEM;
4050         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4051         if (rule == NULL)
4052                 goto err_release_expr;
4053
4054         nft_activate_next(net, rule);
4055
4056         rule->handle = handle;
4057         rule->dlen   = size;
4058         rule->udata  = ulen ? 1 : 0;
4059
4060         if (ulen) {
4061                 udata = nft_userdata(rule);
4062                 udata->len = ulen - 1;
4063                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4064         }
4065
4066         expr = nft_expr_first(rule);
4067         for (i = 0; i < n; i++) {
4068                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4069                 if (err < 0) {
4070                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4071                         goto err_release_rule;
4072                 }
4073
4074                 if (expr_info[i].ops->validate)
4075                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
4076
4077                 expr_info[i].ops = NULL;
4078                 expr = nft_expr_next(expr);
4079         }
4080
4081         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4082                 flow = nft_flow_rule_create(net, rule);
4083                 if (IS_ERR(flow)) {
4084                         err = PTR_ERR(flow);
4085                         goto err_release_rule;
4086                 }
4087         }
4088
4089         if (!nft_use_inc(&chain->use)) {
4090                 err = -EMFILE;
4091                 goto err_release_rule;
4092         }
4093
4094         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4095                 if (nft_chain_binding(chain)) {
4096                         err = -EOPNOTSUPP;
4097                         goto err_destroy_flow_rule;
4098                 }
4099
4100                 err = nft_delrule(&ctx, old_rule);
4101                 if (err < 0)
4102                         goto err_destroy_flow_rule;
4103
4104                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4105                 if (trans == NULL) {
4106                         err = -ENOMEM;
4107                         goto err_destroy_flow_rule;
4108                 }
4109                 list_add_tail_rcu(&rule->list, &old_rule->list);
4110         } else {
4111                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4112                 if (!trans) {
4113                         err = -ENOMEM;
4114                         goto err_destroy_flow_rule;
4115                 }
4116
4117                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4118                         if (old_rule)
4119                                 list_add_rcu(&rule->list, &old_rule->list);
4120                         else
4121                                 list_add_tail_rcu(&rule->list, &chain->rules);
4122                  } else {
4123                         if (old_rule)
4124                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4125                         else
4126                                 list_add_rcu(&rule->list, &chain->rules);
4127                 }
4128         }
4129         kvfree(expr_info);
4130
4131         if (flow)
4132                 nft_trans_flow_rule(trans) = flow;
4133
4134         if (table->validate_state == NFT_VALIDATE_DO)
4135                 return nft_table_validate(net, table);
4136
4137         return 0;
4138
4139 err_destroy_flow_rule:
4140         nft_use_dec_restore(&chain->use);
4141         if (flow)
4142                 nft_flow_rule_destroy(flow);
4143 err_release_rule:
4144         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4145         nf_tables_rule_destroy(&ctx, rule);
4146 err_release_expr:
4147         for (i = 0; i < n; i++) {
4148                 if (expr_info[i].ops) {
4149                         module_put(expr_info[i].ops->type->owner);
4150                         if (expr_info[i].ops->type->release_ops)
4151                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4152                 }
4153         }
4154         kvfree(expr_info);
4155
4156         return err;
4157 }
4158
4159 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4160                                              const struct nft_chain *chain,
4161                                              const struct nlattr *nla)
4162 {
4163         struct nftables_pernet *nft_net = nft_pernet(net);
4164         u32 id = ntohl(nla_get_be32(nla));
4165         struct nft_trans *trans;
4166
4167         list_for_each_entry(trans, &nft_net->commit_list, list) {
4168                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4169                     trans->ctx.chain == chain &&
4170                     id == nft_trans_rule_id(trans))
4171                         return nft_trans_rule(trans);
4172         }
4173         return ERR_PTR(-ENOENT);
4174 }
4175
4176 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4177                              const struct nlattr * const nla[])
4178 {
4179         struct netlink_ext_ack *extack = info->extack;
4180         u8 genmask = nft_genmask_next(info->net);
4181         u8 family = info->nfmsg->nfgen_family;
4182         struct nft_chain *chain = NULL;
4183         struct net *net = info->net;
4184         struct nft_table *table;
4185         struct nft_rule *rule;
4186         struct nft_ctx ctx;
4187         int err = 0;
4188
4189         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4190                                  NETLINK_CB(skb).portid);
4191         if (IS_ERR(table)) {
4192                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4193                 return PTR_ERR(table);
4194         }
4195
4196         if (nla[NFTA_RULE_CHAIN]) {
4197                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4198                                          genmask);
4199                 if (IS_ERR(chain)) {
4200                         if (PTR_ERR(chain) == -ENOENT &&
4201                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4202                                 return 0;
4203
4204                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4205                         return PTR_ERR(chain);
4206                 }
4207                 if (nft_chain_binding(chain))
4208                         return -EOPNOTSUPP;
4209         }
4210
4211         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4212
4213         if (chain) {
4214                 if (nla[NFTA_RULE_HANDLE]) {
4215                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4216                         if (IS_ERR(rule)) {
4217                                 if (PTR_ERR(rule) == -ENOENT &&
4218                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4219                                         return 0;
4220
4221                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4222                                 return PTR_ERR(rule);
4223                         }
4224
4225                         err = nft_delrule(&ctx, rule);
4226                 } else if (nla[NFTA_RULE_ID]) {
4227                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4228                         if (IS_ERR(rule)) {
4229                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4230                                 return PTR_ERR(rule);
4231                         }
4232
4233                         err = nft_delrule(&ctx, rule);
4234                 } else {
4235                         err = nft_delrule_by_chain(&ctx);
4236                 }
4237         } else {
4238                 list_for_each_entry(chain, &table->chains, list) {
4239                         if (!nft_is_active_next(net, chain))
4240                                 continue;
4241                         if (nft_chain_binding(chain))
4242                                 continue;
4243
4244                         ctx.chain = chain;
4245                         err = nft_delrule_by_chain(&ctx);
4246                         if (err < 0)
4247                                 break;
4248                 }
4249         }
4250
4251         return err;
4252 }
4253
4254 /*
4255  * Sets
4256  */
4257 static const struct nft_set_type *nft_set_types[] = {
4258         &nft_set_hash_fast_type,
4259         &nft_set_hash_type,
4260         &nft_set_rhash_type,
4261         &nft_set_bitmap_type,
4262         &nft_set_rbtree_type,
4263 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4264         &nft_set_pipapo_avx2_type,
4265 #endif
4266         &nft_set_pipapo_type,
4267 };
4268
4269 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4270                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4271                                  NFT_SET_EVAL)
4272
4273 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4274 {
4275         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4276 }
4277
4278 /*
4279  * Select a set implementation based on the data characteristics and the
4280  * given policy. The total memory use might not be known if no size is
4281  * given, in that case the amount of memory per element is used.
4282  */
4283 static const struct nft_set_ops *
4284 nft_select_set_ops(const struct nft_ctx *ctx, u32 flags,
4285                    const struct nft_set_desc *desc)
4286 {
4287         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4288         const struct nft_set_ops *ops, *bops;
4289         struct nft_set_estimate est, best;
4290         const struct nft_set_type *type;
4291         int i;
4292
4293         lockdep_assert_held(&nft_net->commit_mutex);
4294         lockdep_nfnl_nft_mutex_not_held();
4295
4296         bops        = NULL;
4297         best.size   = ~0;
4298         best.lookup = ~0;
4299         best.space  = ~0;
4300
4301         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4302                 type = nft_set_types[i];
4303                 ops = &type->ops;
4304
4305                 if (!nft_set_ops_candidate(type, flags))
4306                         continue;
4307                 if (!ops->estimate(desc, flags, &est))
4308                         continue;
4309
4310                 switch (desc->policy) {
4311                 case NFT_SET_POL_PERFORMANCE:
4312                         if (est.lookup < best.lookup)
4313                                 break;
4314                         if (est.lookup == best.lookup &&
4315                             est.space < best.space)
4316                                 break;
4317                         continue;
4318                 case NFT_SET_POL_MEMORY:
4319                         if (!desc->size) {
4320                                 if (est.space < best.space)
4321                                         break;
4322                                 if (est.space == best.space &&
4323                                     est.lookup < best.lookup)
4324                                         break;
4325                         } else if (est.size < best.size || !bops) {
4326                                 break;
4327                         }
4328                         continue;
4329                 default:
4330                         break;
4331                 }
4332
4333                 bops = ops;
4334                 best = est;
4335         }
4336
4337         if (bops != NULL)
4338                 return bops;
4339
4340         return ERR_PTR(-EOPNOTSUPP);
4341 }
4342
4343 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4344         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4345                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4346         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4347                                             .len = NFT_SET_MAXNAMELEN - 1 },
4348         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4349         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4350         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4351         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4352         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4353         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4354         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4355         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4356         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4357         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4358         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4359                                             .len  = NFT_USERDATA_MAXLEN },
4360         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4361         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4362         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4363         [NFTA_SET_EXPRESSIONS]          = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4364 };
4365
4366 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4367         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4368 };
4369
4370 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4371         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4372         [NFTA_SET_DESC_CONCAT]          = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4373 };
4374
4375 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4376                                       const struct nlattr *nla, u8 genmask)
4377 {
4378         struct nft_set *set;
4379
4380         if (nla == NULL)
4381                 return ERR_PTR(-EINVAL);
4382
4383         list_for_each_entry_rcu(set, &table->sets, list) {
4384                 if (!nla_strcmp(nla, set->name) &&
4385                     nft_active_genmask(set, genmask))
4386                         return set;
4387         }
4388         return ERR_PTR(-ENOENT);
4389 }
4390
4391 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4392                                                const struct nlattr *nla,
4393                                                u8 genmask)
4394 {
4395         struct nft_set *set;
4396
4397         list_for_each_entry(set, &table->sets, list) {
4398                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4399                     nft_active_genmask(set, genmask))
4400                         return set;
4401         }
4402         return ERR_PTR(-ENOENT);
4403 }
4404
4405 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4406                                            const struct nft_table *table,
4407                                            const struct nlattr *nla, u8 genmask)
4408 {
4409         struct nftables_pernet *nft_net = nft_pernet(net);
4410         u32 id = ntohl(nla_get_be32(nla));
4411         struct nft_trans *trans;
4412
4413         list_for_each_entry(trans, &nft_net->commit_list, list) {
4414                 if (trans->msg_type == NFT_MSG_NEWSET) {
4415                         struct nft_set *set = nft_trans_set(trans);
4416
4417                         if (id == nft_trans_set_id(trans) &&
4418                             set->table == table &&
4419                             nft_active_genmask(set, genmask))
4420                                 return set;
4421                 }
4422         }
4423         return ERR_PTR(-ENOENT);
4424 }
4425
4426 struct nft_set *nft_set_lookup_global(const struct net *net,
4427                                       const struct nft_table *table,
4428                                       const struct nlattr *nla_set_name,
4429                                       const struct nlattr *nla_set_id,
4430                                       u8 genmask)
4431 {
4432         struct nft_set *set;
4433
4434         set = nft_set_lookup(table, nla_set_name, genmask);
4435         if (IS_ERR(set)) {
4436                 if (!nla_set_id)
4437                         return set;
4438
4439                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4440         }
4441         return set;
4442 }
4443 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4444
4445 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4446                                     const char *name)
4447 {
4448         const struct nft_set *i;
4449         const char *p;
4450         unsigned long *inuse;
4451         unsigned int n = 0, min = 0;
4452
4453         p = strchr(name, '%');
4454         if (p != NULL) {
4455                 if (p[1] != 'd' || strchr(p + 2, '%'))
4456                         return -EINVAL;
4457
4458                 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4459                         return -EINVAL;
4460
4461                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4462                 if (inuse == NULL)
4463                         return -ENOMEM;
4464 cont:
4465                 list_for_each_entry(i, &ctx->table->sets, list) {
4466                         int tmp;
4467
4468                         if (!nft_is_active_next(ctx->net, i))
4469                                 continue;
4470                         if (!sscanf(i->name, name, &tmp))
4471                                 continue;
4472                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4473                                 continue;
4474
4475                         set_bit(tmp - min, inuse);
4476                 }
4477
4478                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4479                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4480                         min += BITS_PER_BYTE * PAGE_SIZE;
4481                         memset(inuse, 0, PAGE_SIZE);
4482                         goto cont;
4483                 }
4484                 free_page((unsigned long)inuse);
4485         }
4486
4487         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4488         if (!set->name)
4489                 return -ENOMEM;
4490
4491         list_for_each_entry(i, &ctx->table->sets, list) {
4492                 if (!nft_is_active_next(ctx->net, i))
4493                         continue;
4494                 if (!strcmp(set->name, i->name)) {
4495                         kfree(set->name);
4496                         set->name = NULL;
4497                         return -ENFILE;
4498                 }
4499         }
4500         return 0;
4501 }
4502
4503 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4504 {
4505         u64 ms = be64_to_cpu(nla_get_be64(nla));
4506         u64 max = (u64)(~((u64)0));
4507
4508         max = div_u64(max, NSEC_PER_MSEC);
4509         if (ms >= max)
4510                 return -ERANGE;
4511
4512         ms *= NSEC_PER_MSEC;
4513         *result = nsecs_to_jiffies64(ms);
4514         return 0;
4515 }
4516
4517 __be64 nf_jiffies64_to_msecs(u64 input)
4518 {
4519         return cpu_to_be64(jiffies64_to_msecs(input));
4520 }
4521
4522 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4523                                      const struct nft_set *set)
4524 {
4525         struct nlattr *concat, *field;
4526         int i;
4527
4528         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4529         if (!concat)
4530                 return -ENOMEM;
4531
4532         for (i = 0; i < set->field_count; i++) {
4533                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4534                 if (!field)
4535                         return -ENOMEM;
4536
4537                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4538                                  htonl(set->field_len[i])))
4539                         return -ENOMEM;
4540
4541                 nla_nest_end(skb, field);
4542         }
4543
4544         nla_nest_end(skb, concat);
4545
4546         return 0;
4547 }
4548
4549 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4550                               const struct nft_set *set, u16 event, u16 flags)
4551 {
4552         u64 timeout = READ_ONCE(set->timeout);
4553         u32 gc_int = READ_ONCE(set->gc_int);
4554         u32 portid = ctx->portid;
4555         struct nlmsghdr *nlh;
4556         struct nlattr *nest;
4557         u32 seq = ctx->seq;
4558         int i;
4559
4560         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4561         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4562                            NFNETLINK_V0, nft_base_seq(ctx->net));
4563         if (!nlh)
4564                 goto nla_put_failure;
4565
4566         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4567                 goto nla_put_failure;
4568         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4569                 goto nla_put_failure;
4570         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4571                          NFTA_SET_PAD))
4572                 goto nla_put_failure;
4573
4574         if (event == NFT_MSG_DELSET) {
4575                 nlmsg_end(skb, nlh);
4576                 return 0;
4577         }
4578
4579         if (set->flags != 0)
4580                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4581                         goto nla_put_failure;
4582
4583         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4584                 goto nla_put_failure;
4585         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4586                 goto nla_put_failure;
4587         if (set->flags & NFT_SET_MAP) {
4588                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4589                         goto nla_put_failure;
4590                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4591                         goto nla_put_failure;
4592         }
4593         if (set->flags & NFT_SET_OBJECT &&
4594             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4595                 goto nla_put_failure;
4596
4597         if (timeout &&
4598             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4599                          nf_jiffies64_to_msecs(timeout),
4600                          NFTA_SET_PAD))
4601                 goto nla_put_failure;
4602         if (gc_int &&
4603             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4604                 goto nla_put_failure;
4605
4606         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4607                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4608                         goto nla_put_failure;
4609         }
4610
4611         if (set->udata &&
4612             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4613                 goto nla_put_failure;
4614
4615         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4616         if (!nest)
4617                 goto nla_put_failure;
4618         if (set->size &&
4619             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4620                 goto nla_put_failure;
4621
4622         if (set->field_count > 1 &&
4623             nf_tables_fill_set_concat(skb, set))
4624                 goto nla_put_failure;
4625
4626         nla_nest_end(skb, nest);
4627
4628         if (set->num_exprs == 1) {
4629                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4630                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4631                         goto nla_put_failure;
4632
4633                 nla_nest_end(skb, nest);
4634         } else if (set->num_exprs > 1) {
4635                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4636                 if (nest == NULL)
4637                         goto nla_put_failure;
4638
4639                 for (i = 0; i < set->num_exprs; i++) {
4640                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4641                                           set->exprs[i], false) < 0)
4642                                 goto nla_put_failure;
4643                 }
4644                 nla_nest_end(skb, nest);
4645         }
4646
4647         nlmsg_end(skb, nlh);
4648         return 0;
4649
4650 nla_put_failure:
4651         nlmsg_trim(skb, nlh);
4652         return -1;
4653 }
4654
4655 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4656                                  const struct nft_set *set, int event,
4657                                  gfp_t gfp_flags)
4658 {
4659         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4660         u32 portid = ctx->portid;
4661         struct sk_buff *skb;
4662         u16 flags = 0;
4663         int err;
4664
4665         if (!ctx->report &&
4666             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4667                 return;
4668
4669         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4670         if (skb == NULL)
4671                 goto err;
4672
4673         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4674                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4675
4676         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4677         if (err < 0) {
4678                 kfree_skb(skb);
4679                 goto err;
4680         }
4681
4682         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4683         return;
4684 err:
4685         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4686 }
4687
4688 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4689 {
4690         const struct nft_set *set;
4691         unsigned int idx, s_idx = cb->args[0];
4692         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4693         struct net *net = sock_net(skb->sk);
4694         struct nft_ctx *ctx = cb->data, ctx_set;
4695         struct nftables_pernet *nft_net;
4696
4697         if (cb->args[1])
4698                 return skb->len;
4699
4700         rcu_read_lock();
4701         nft_net = nft_pernet(net);
4702         cb->seq = READ_ONCE(nft_net->base_seq);
4703
4704         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4705                 if (ctx->family != NFPROTO_UNSPEC &&
4706                     ctx->family != table->family)
4707                         continue;
4708
4709                 if (ctx->table && ctx->table != table)
4710                         continue;
4711
4712                 if (cur_table) {
4713                         if (cur_table != table)
4714                                 continue;
4715
4716                         cur_table = NULL;
4717                 }
4718                 idx = 0;
4719                 list_for_each_entry_rcu(set, &table->sets, list) {
4720                         if (idx < s_idx)
4721                                 goto cont;
4722                         if (!nft_is_active(net, set))
4723                                 goto cont;
4724
4725                         ctx_set = *ctx;
4726                         ctx_set.table = table;
4727                         ctx_set.family = table->family;
4728
4729                         if (nf_tables_fill_set(skb, &ctx_set, set,
4730                                                NFT_MSG_NEWSET,
4731                                                NLM_F_MULTI) < 0) {
4732                                 cb->args[0] = idx;
4733                                 cb->args[2] = (unsigned long) table;
4734                                 goto done;
4735                         }
4736                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4737 cont:
4738                         idx++;
4739                 }
4740                 if (s_idx)
4741                         s_idx = 0;
4742         }
4743         cb->args[1] = 1;
4744 done:
4745         rcu_read_unlock();
4746         return skb->len;
4747 }
4748
4749 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4750 {
4751         struct nft_ctx *ctx_dump = NULL;
4752
4753         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4754         if (ctx_dump == NULL)
4755                 return -ENOMEM;
4756
4757         cb->data = ctx_dump;
4758         return 0;
4759 }
4760
4761 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4762 {
4763         kfree(cb->data);
4764         return 0;
4765 }
4766
4767 /* called with rcu_read_lock held */
4768 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4769                             const struct nlattr * const nla[])
4770 {
4771         struct netlink_ext_ack *extack = info->extack;
4772         u8 genmask = nft_genmask_cur(info->net);
4773         u8 family = info->nfmsg->nfgen_family;
4774         struct nft_table *table = NULL;
4775         struct net *net = info->net;
4776         const struct nft_set *set;
4777         struct sk_buff *skb2;
4778         struct nft_ctx ctx;
4779         int err;
4780
4781         if (nla[NFTA_SET_TABLE]) {
4782                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4783                                          genmask, 0);
4784                 if (IS_ERR(table)) {
4785                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4786                         return PTR_ERR(table);
4787                 }
4788         }
4789
4790         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4791
4792         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4793                 struct netlink_dump_control c = {
4794                         .start = nf_tables_dump_sets_start,
4795                         .dump = nf_tables_dump_sets,
4796                         .done = nf_tables_dump_sets_done,
4797                         .data = &ctx,
4798                         .module = THIS_MODULE,
4799                 };
4800
4801                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4802         }
4803
4804         /* Only accept unspec with dump */
4805         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4806                 return -EAFNOSUPPORT;
4807         if (!nla[NFTA_SET_TABLE])
4808                 return -EINVAL;
4809
4810         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4811         if (IS_ERR(set)) {
4812                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4813                 return PTR_ERR(set);
4814         }
4815
4816         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4817         if (skb2 == NULL)
4818                 return -ENOMEM;
4819
4820         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4821         if (err < 0)
4822                 goto err_fill_set_info;
4823
4824         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4825
4826 err_fill_set_info:
4827         kfree_skb(skb2);
4828         return err;
4829 }
4830
4831 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4832                                      struct nft_set_desc *desc)
4833 {
4834         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4835         u32 len;
4836         int err;
4837
4838         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4839                 return -E2BIG;
4840
4841         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4842                                           nft_concat_policy, NULL);
4843         if (err < 0)
4844                 return err;
4845
4846         if (!tb[NFTA_SET_FIELD_LEN])
4847                 return -EINVAL;
4848
4849         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4850         if (!len || len > U8_MAX)
4851                 return -EINVAL;
4852
4853         desc->field_len[desc->field_count++] = len;
4854
4855         return 0;
4856 }
4857
4858 static int nft_set_desc_concat(struct nft_set_desc *desc,
4859                                const struct nlattr *nla)
4860 {
4861         u32 num_regs = 0, key_num_regs = 0;
4862         struct nlattr *attr;
4863         int rem, err, i;
4864
4865         nla_for_each_nested(attr, nla, rem) {
4866                 if (nla_type(attr) != NFTA_LIST_ELEM)
4867                         return -EINVAL;
4868
4869                 err = nft_set_desc_concat_parse(attr, desc);
4870                 if (err < 0)
4871                         return err;
4872         }
4873
4874         for (i = 0; i < desc->field_count; i++)
4875                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4876
4877         key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4878         if (key_num_regs != num_regs)
4879                 return -EINVAL;
4880
4881         if (num_regs > NFT_REG32_COUNT)
4882                 return -E2BIG;
4883
4884         return 0;
4885 }
4886
4887 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4888                                     const struct nlattr *nla)
4889 {
4890         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4891         int err;
4892
4893         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4894                                           nft_set_desc_policy, NULL);
4895         if (err < 0)
4896                 return err;
4897
4898         if (da[NFTA_SET_DESC_SIZE] != NULL)
4899                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4900         if (da[NFTA_SET_DESC_CONCAT])
4901                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4902
4903         return err;
4904 }
4905
4906 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4907                               const struct nlattr * const *nla,
4908                               struct nft_expr **exprs, int *num_exprs,
4909                               u32 flags)
4910 {
4911         struct nft_expr *expr;
4912         int err, i;
4913
4914         if (nla[NFTA_SET_EXPR]) {
4915                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4916                 if (IS_ERR(expr)) {
4917                         err = PTR_ERR(expr);
4918                         goto err_set_expr_alloc;
4919                 }
4920                 exprs[0] = expr;
4921                 (*num_exprs)++;
4922         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4923                 struct nlattr *tmp;
4924                 int left;
4925
4926                 if (!(flags & NFT_SET_EXPR)) {
4927                         err = -EINVAL;
4928                         goto err_set_expr_alloc;
4929                 }
4930                 i = 0;
4931                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4932                         if (i == NFT_SET_EXPR_MAX) {
4933                                 err = -E2BIG;
4934                                 goto err_set_expr_alloc;
4935                         }
4936                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4937                                 err = -EINVAL;
4938                                 goto err_set_expr_alloc;
4939                         }
4940                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4941                         if (IS_ERR(expr)) {
4942                                 err = PTR_ERR(expr);
4943                                 goto err_set_expr_alloc;
4944                         }
4945                         exprs[i++] = expr;
4946                         (*num_exprs)++;
4947                 }
4948         }
4949
4950         return 0;
4951
4952 err_set_expr_alloc:
4953         for (i = 0; i < *num_exprs; i++)
4954                 nft_expr_destroy(ctx, exprs[i]);
4955
4956         return err;
4957 }
4958
4959 static bool nft_set_is_same(const struct nft_set *set,
4960                             const struct nft_set_desc *desc,
4961                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4962 {
4963         int i;
4964
4965         if (set->ktype != desc->ktype ||
4966             set->dtype != desc->dtype ||
4967             set->flags != flags ||
4968             set->klen != desc->klen ||
4969             set->dlen != desc->dlen ||
4970             set->field_count != desc->field_count ||
4971             set->num_exprs != num_exprs)
4972                 return false;
4973
4974         for (i = 0; i < desc->field_count; i++) {
4975                 if (set->field_len[i] != desc->field_len[i])
4976                         return false;
4977         }
4978
4979         for (i = 0; i < num_exprs; i++) {
4980                 if (set->exprs[i]->ops != exprs[i]->ops)
4981                         return false;
4982         }
4983
4984         return true;
4985 }
4986
4987 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4988                             const struct nlattr * const nla[])
4989 {
4990         struct netlink_ext_ack *extack = info->extack;
4991         u8 genmask = nft_genmask_next(info->net);
4992         u8 family = info->nfmsg->nfgen_family;
4993         const struct nft_set_ops *ops;
4994         struct net *net = info->net;
4995         struct nft_set_desc desc;
4996         struct nft_table *table;
4997         unsigned char *udata;
4998         struct nft_set *set;
4999         struct nft_ctx ctx;
5000         size_t alloc_size;
5001         int num_exprs = 0;
5002         char *name;
5003         int err, i;
5004         u16 udlen;
5005         u32 flags;
5006         u64 size;
5007
5008         if (nla[NFTA_SET_TABLE] == NULL ||
5009             nla[NFTA_SET_NAME] == NULL ||
5010             nla[NFTA_SET_KEY_LEN] == NULL ||
5011             nla[NFTA_SET_ID] == NULL)
5012                 return -EINVAL;
5013
5014         memset(&desc, 0, sizeof(desc));
5015
5016         desc.ktype = NFT_DATA_VALUE;
5017         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
5018                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
5019                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
5020                         return -EINVAL;
5021         }
5022
5023         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
5024         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
5025                 return -EINVAL;
5026
5027         flags = 0;
5028         if (nla[NFTA_SET_FLAGS] != NULL) {
5029                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
5030                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
5031                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
5032                               NFT_SET_MAP | NFT_SET_EVAL |
5033                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
5034                         return -EOPNOTSUPP;
5035                 /* Only one of these operations is supported */
5036                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
5037                              (NFT_SET_MAP | NFT_SET_OBJECT))
5038                         return -EOPNOTSUPP;
5039                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
5040                              (NFT_SET_EVAL | NFT_SET_OBJECT))
5041                         return -EOPNOTSUPP;
5042                 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
5043                              (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
5044                         return -EOPNOTSUPP;
5045                 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5046                              (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5047                         return -EOPNOTSUPP;
5048         }
5049
5050         desc.dtype = 0;
5051         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5052                 if (!(flags & NFT_SET_MAP))
5053                         return -EINVAL;
5054
5055                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5056                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5057                     desc.dtype != NFT_DATA_VERDICT)
5058                         return -EINVAL;
5059
5060                 if (desc.dtype != NFT_DATA_VERDICT) {
5061                         if (nla[NFTA_SET_DATA_LEN] == NULL)
5062                                 return -EINVAL;
5063                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5064                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5065                                 return -EINVAL;
5066                 } else
5067                         desc.dlen = sizeof(struct nft_verdict);
5068         } else if (flags & NFT_SET_MAP)
5069                 return -EINVAL;
5070
5071         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5072                 if (!(flags & NFT_SET_OBJECT))
5073                         return -EINVAL;
5074
5075                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5076                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5077                     desc.objtype > NFT_OBJECT_MAX)
5078                         return -EOPNOTSUPP;
5079         } else if (flags & NFT_SET_OBJECT)
5080                 return -EINVAL;
5081         else
5082                 desc.objtype = NFT_OBJECT_UNSPEC;
5083
5084         desc.timeout = 0;
5085         if (nla[NFTA_SET_TIMEOUT] != NULL) {
5086                 if (!(flags & NFT_SET_TIMEOUT))
5087                         return -EINVAL;
5088
5089                 if (flags & NFT_SET_ANONYMOUS)
5090                         return -EOPNOTSUPP;
5091
5092                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5093                 if (err)
5094                         return err;
5095         }
5096         desc.gc_int = 0;
5097         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5098                 if (!(flags & NFT_SET_TIMEOUT))
5099                         return -EINVAL;
5100
5101                 if (flags & NFT_SET_ANONYMOUS)
5102                         return -EOPNOTSUPP;
5103
5104                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5105         }
5106
5107         desc.policy = NFT_SET_POL_PERFORMANCE;
5108         if (nla[NFTA_SET_POLICY] != NULL) {
5109                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5110                 switch (desc.policy) {
5111                 case NFT_SET_POL_PERFORMANCE:
5112                 case NFT_SET_POL_MEMORY:
5113                         break;
5114                 default:
5115                         return -EOPNOTSUPP;
5116                 }
5117         }
5118
5119         if (nla[NFTA_SET_DESC] != NULL) {
5120                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5121                 if (err < 0)
5122                         return err;
5123
5124                 if (desc.field_count > 1) {
5125                         if (!(flags & NFT_SET_CONCAT))
5126                                 return -EINVAL;
5127                 } else if (flags & NFT_SET_CONCAT) {
5128                         return -EINVAL;
5129                 }
5130         } else if (flags & NFT_SET_CONCAT) {
5131                 return -EINVAL;
5132         }
5133
5134         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5135                 desc.expr = true;
5136
5137         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5138                                  NETLINK_CB(skb).portid);
5139         if (IS_ERR(table)) {
5140                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5141                 return PTR_ERR(table);
5142         }
5143
5144         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5145
5146         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5147         if (IS_ERR(set)) {
5148                 if (PTR_ERR(set) != -ENOENT) {
5149                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5150                         return PTR_ERR(set);
5151                 }
5152         } else {
5153                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5154
5155                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5156                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5157                         return -EEXIST;
5158                 }
5159                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5160                         return -EOPNOTSUPP;
5161
5162                 if (nft_set_is_anonymous(set))
5163                         return -EOPNOTSUPP;
5164
5165                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5166                 if (err < 0)
5167                         return err;
5168
5169                 err = 0;
5170                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5171                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5172                         err = -EEXIST;
5173                 }
5174
5175                 for (i = 0; i < num_exprs; i++)
5176                         nft_expr_destroy(&ctx, exprs[i]);
5177
5178                 if (err < 0)
5179                         return err;
5180
5181                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5182         }
5183
5184         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5185                 return -ENOENT;
5186
5187         ops = nft_select_set_ops(&ctx, flags, &desc);
5188         if (IS_ERR(ops))
5189                 return PTR_ERR(ops);
5190
5191         udlen = 0;
5192         if (nla[NFTA_SET_USERDATA])
5193                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5194
5195         size = 0;
5196         if (ops->privsize != NULL)
5197                 size = ops->privsize(nla, &desc);
5198         alloc_size = sizeof(*set) + size + udlen;
5199         if (alloc_size < size || alloc_size > INT_MAX)
5200                 return -ENOMEM;
5201
5202         if (!nft_use_inc(&table->use))
5203                 return -EMFILE;
5204
5205         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5206         if (!set) {
5207                 err = -ENOMEM;
5208                 goto err_alloc;
5209         }
5210
5211         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5212         if (!name) {
5213                 err = -ENOMEM;
5214                 goto err_set_name;
5215         }
5216
5217         err = nf_tables_set_alloc_name(&ctx, set, name);
5218         kfree(name);
5219         if (err < 0)
5220                 goto err_set_name;
5221
5222         udata = NULL;
5223         if (udlen) {
5224                 udata = set->data + size;
5225                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5226         }
5227
5228         INIT_LIST_HEAD(&set->bindings);
5229         INIT_LIST_HEAD(&set->catchall_list);
5230         refcount_set(&set->refs, 1);
5231         set->table = table;
5232         write_pnet(&set->net, net);
5233         set->ops = ops;
5234         set->ktype = desc.ktype;
5235         set->klen = desc.klen;
5236         set->dtype = desc.dtype;
5237         set->objtype = desc.objtype;
5238         set->dlen = desc.dlen;
5239         set->flags = flags;
5240         set->size = desc.size;
5241         set->policy = desc.policy;
5242         set->udlen = udlen;
5243         set->udata = udata;
5244         set->timeout = desc.timeout;
5245         set->gc_int = desc.gc_int;
5246
5247         set->field_count = desc.field_count;
5248         for (i = 0; i < desc.field_count; i++)
5249                 set->field_len[i] = desc.field_len[i];
5250
5251         err = ops->init(set, &desc, nla);
5252         if (err < 0)
5253                 goto err_set_init;
5254
5255         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5256         if (err < 0)
5257                 goto err_set_destroy;
5258
5259         set->num_exprs = num_exprs;
5260         set->handle = nf_tables_alloc_handle(table);
5261         INIT_LIST_HEAD(&set->pending_update);
5262
5263         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5264         if (err < 0)
5265                 goto err_set_expr_alloc;
5266
5267         list_add_tail_rcu(&set->list, &table->sets);
5268
5269         return 0;
5270
5271 err_set_expr_alloc:
5272         for (i = 0; i < set->num_exprs; i++)
5273                 nft_expr_destroy(&ctx, set->exprs[i]);
5274 err_set_destroy:
5275         ops->destroy(&ctx, set);
5276 err_set_init:
5277         kfree(set->name);
5278 err_set_name:
5279         kvfree(set);
5280 err_alloc:
5281         nft_use_dec_restore(&table->use);
5282
5283         return err;
5284 }
5285
5286 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5287                                      struct nft_set *set)
5288 {
5289         struct nft_set_elem_catchall *next, *catchall;
5290
5291         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5292                 list_del_rcu(&catchall->list);
5293                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5294                 kfree_rcu(catchall, rcu);
5295         }
5296 }
5297
5298 static void nft_set_put(struct nft_set *set)
5299 {
5300         if (refcount_dec_and_test(&set->refs)) {
5301                 kfree(set->name);
5302                 kvfree(set);
5303         }
5304 }
5305
5306 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5307 {
5308         int i;
5309
5310         if (WARN_ON(set->use > 0))
5311                 return;
5312
5313         for (i = 0; i < set->num_exprs; i++)
5314                 nft_expr_destroy(ctx, set->exprs[i]);
5315
5316         set->ops->destroy(ctx, set);
5317         nft_set_catchall_destroy(ctx, set);
5318         nft_set_put(set);
5319 }
5320
5321 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5322                             const struct nlattr * const nla[])
5323 {
5324         struct netlink_ext_ack *extack = info->extack;
5325         u8 genmask = nft_genmask_next(info->net);
5326         u8 family = info->nfmsg->nfgen_family;
5327         struct net *net = info->net;
5328         const struct nlattr *attr;
5329         struct nft_table *table;
5330         struct nft_set *set;
5331         struct nft_ctx ctx;
5332
5333         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5334                 return -EAFNOSUPPORT;
5335
5336         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5337                                  genmask, NETLINK_CB(skb).portid);
5338         if (IS_ERR(table)) {
5339                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5340                 return PTR_ERR(table);
5341         }
5342
5343         if (nla[NFTA_SET_HANDLE]) {
5344                 attr = nla[NFTA_SET_HANDLE];
5345                 set = nft_set_lookup_byhandle(table, attr, genmask);
5346         } else {
5347                 attr = nla[NFTA_SET_NAME];
5348                 set = nft_set_lookup(table, attr, genmask);
5349         }
5350
5351         if (IS_ERR(set)) {
5352                 if (PTR_ERR(set) == -ENOENT &&
5353                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5354                         return 0;
5355
5356                 NL_SET_BAD_ATTR(extack, attr);
5357                 return PTR_ERR(set);
5358         }
5359         if (set->use ||
5360             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5361              atomic_read(&set->nelems) > 0)) {
5362                 NL_SET_BAD_ATTR(extack, attr);
5363                 return -EBUSY;
5364         }
5365
5366         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5367
5368         return nft_delset(&ctx, set);
5369 }
5370
5371 static int nft_validate_register_store(const struct nft_ctx *ctx,
5372                                        enum nft_registers reg,
5373                                        const struct nft_data *data,
5374                                        enum nft_data_types type,
5375                                        unsigned int len);
5376
5377 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5378                                      struct nft_set *set,
5379                                      struct nft_elem_priv *elem_priv)
5380 {
5381         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5382         enum nft_registers dreg;
5383
5384         dreg = nft_type_to_reg(set->dtype);
5385         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5386                                            set->dtype == NFT_DATA_VERDICT ?
5387                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5388                                            set->dlen);
5389 }
5390
5391 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5392                                         struct nft_set *set,
5393                                         const struct nft_set_iter *iter,
5394                                         struct nft_elem_priv *elem_priv)
5395 {
5396         return nft_setelem_data_validate(ctx, set, elem_priv);
5397 }
5398
5399 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5400                                        struct nft_set *set)
5401 {
5402         u8 genmask = nft_genmask_next(ctx->net);
5403         struct nft_set_elem_catchall *catchall;
5404         struct nft_set_ext *ext;
5405         int ret = 0;
5406
5407         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5408                 ext = nft_set_elem_ext(set, catchall->elem);
5409                 if (!nft_set_elem_active(ext, genmask))
5410                         continue;
5411
5412                 ret = nft_setelem_data_validate(ctx, set, catchall->elem);
5413                 if (ret < 0)
5414                         break;
5415         }
5416
5417         return ret;
5418 }
5419
5420 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5421                        struct nft_set_binding *binding)
5422 {
5423         struct nft_set_binding *i;
5424         struct nft_set_iter iter;
5425
5426         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5427                 return -EBUSY;
5428
5429         if (binding->flags & NFT_SET_MAP) {
5430                 /* If the set is already bound to the same chain all
5431                  * jumps are already validated for that chain.
5432                  */
5433                 list_for_each_entry(i, &set->bindings, list) {
5434                         if (i->flags & NFT_SET_MAP &&
5435                             i->chain == binding->chain)
5436                                 goto bind;
5437                 }
5438
5439                 iter.genmask    = nft_genmask_next(ctx->net);
5440                 iter.skip       = 0;
5441                 iter.count      = 0;
5442                 iter.err        = 0;
5443                 iter.fn         = nf_tables_bind_check_setelem;
5444
5445                 set->ops->walk(ctx, set, &iter);
5446                 if (!iter.err)
5447                         iter.err = nft_set_catchall_bind_check(ctx, set);
5448
5449                 if (iter.err < 0)
5450                         return iter.err;
5451         }
5452 bind:
5453         if (!nft_use_inc(&set->use))
5454                 return -EMFILE;
5455
5456         binding->chain = ctx->chain;
5457         list_add_tail_rcu(&binding->list, &set->bindings);
5458         nft_set_trans_bind(ctx, set);
5459
5460         return 0;
5461 }
5462 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5463
5464 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5465                                  struct nft_set_binding *binding, bool event)
5466 {
5467         list_del_rcu(&binding->list);
5468
5469         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5470                 list_del_rcu(&set->list);
5471                 set->dead = 1;
5472                 if (event)
5473                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5474                                              GFP_KERNEL);
5475         }
5476 }
5477
5478 static void nft_setelem_data_activate(const struct net *net,
5479                                       const struct nft_set *set,
5480                                       struct nft_elem_priv *elem_priv);
5481
5482 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5483                                 struct nft_set *set,
5484                                 const struct nft_set_iter *iter,
5485                                 struct nft_elem_priv *elem_priv)
5486 {
5487         nft_setelem_data_activate(ctx->net, set, elem_priv);
5488
5489         return 0;
5490 }
5491
5492 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5493                                       struct nft_set *set)
5494 {
5495         u8 genmask = nft_genmask_next(ctx->net);
5496         struct nft_set_elem_catchall *catchall;
5497         struct nft_set_ext *ext;
5498
5499         list_for_each_entry(catchall, &set->catchall_list, list) {
5500                 ext = nft_set_elem_ext(set, catchall->elem);
5501                 if (!nft_set_elem_active(ext, genmask))
5502                         continue;
5503
5504                 nft_setelem_data_activate(ctx->net, set, catchall->elem);
5505                 break;
5506         }
5507 }
5508
5509 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5510 {
5511         struct nft_set_iter iter = {
5512                 .genmask        = nft_genmask_next(ctx->net),
5513                 .fn             = nft_mapelem_activate,
5514         };
5515
5516         set->ops->walk(ctx, set, &iter);
5517         WARN_ON_ONCE(iter.err);
5518
5519         nft_map_catchall_activate(ctx, set);
5520 }
5521
5522 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5523 {
5524         if (nft_set_is_anonymous(set)) {
5525                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5526                         nft_map_activate(ctx, set);
5527
5528                 nft_clear(ctx->net, set);
5529         }
5530
5531         nft_use_inc_restore(&set->use);
5532 }
5533 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5534
5535 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5536                               struct nft_set_binding *binding,
5537                               enum nft_trans_phase phase)
5538 {
5539         switch (phase) {
5540         case NFT_TRANS_PREPARE_ERROR:
5541                 nft_set_trans_unbind(ctx, set);
5542                 if (nft_set_is_anonymous(set))
5543                         nft_deactivate_next(ctx->net, set);
5544                 else
5545                         list_del_rcu(&binding->list);
5546
5547                 nft_use_dec(&set->use);
5548                 break;
5549         case NFT_TRANS_PREPARE:
5550                 if (nft_set_is_anonymous(set)) {
5551                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5552                                 nft_map_deactivate(ctx, set);
5553
5554                         nft_deactivate_next(ctx->net, set);
5555                 }
5556                 nft_use_dec(&set->use);
5557                 return;
5558         case NFT_TRANS_ABORT:
5559         case NFT_TRANS_RELEASE:
5560                 if (nft_set_is_anonymous(set) &&
5561                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5562                         nft_map_deactivate(ctx, set);
5563
5564                 nft_use_dec(&set->use);
5565                 fallthrough;
5566         default:
5567                 nf_tables_unbind_set(ctx, set, binding,
5568                                      phase == NFT_TRANS_COMMIT);
5569         }
5570 }
5571 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5572
5573 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5574 {
5575         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5576                 nft_set_destroy(ctx, set);
5577 }
5578 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5579
5580 const struct nft_set_ext_type nft_set_ext_types[] = {
5581         [NFT_SET_EXT_KEY]               = {
5582                 .align  = __alignof__(u32),
5583         },
5584         [NFT_SET_EXT_DATA]              = {
5585                 .align  = __alignof__(u32),
5586         },
5587         [NFT_SET_EXT_EXPRESSIONS]       = {
5588                 .align  = __alignof__(struct nft_set_elem_expr),
5589         },
5590         [NFT_SET_EXT_OBJREF]            = {
5591                 .len    = sizeof(struct nft_object *),
5592                 .align  = __alignof__(struct nft_object *),
5593         },
5594         [NFT_SET_EXT_FLAGS]             = {
5595                 .len    = sizeof(u8),
5596                 .align  = __alignof__(u8),
5597         },
5598         [NFT_SET_EXT_TIMEOUT]           = {
5599                 .len    = sizeof(u64),
5600                 .align  = __alignof__(u64),
5601         },
5602         [NFT_SET_EXT_EXPIRATION]        = {
5603                 .len    = sizeof(u64),
5604                 .align  = __alignof__(u64),
5605         },
5606         [NFT_SET_EXT_USERDATA]          = {
5607                 .len    = sizeof(struct nft_userdata),
5608                 .align  = __alignof__(struct nft_userdata),
5609         },
5610         [NFT_SET_EXT_KEY_END]           = {
5611                 .align  = __alignof__(u32),
5612         },
5613 };
5614
5615 /*
5616  * Set elements
5617  */
5618
5619 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5620         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5621         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5622         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5623         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5624         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5625         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5626                                             .len = NFT_USERDATA_MAXLEN },
5627         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5628         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5629                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5630         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5631         [NFTA_SET_ELEM_EXPRESSIONS]     = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5632 };
5633
5634 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5635         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5636                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5637         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5638                                             .len = NFT_SET_MAXNAMELEN - 1 },
5639         [NFTA_SET_ELEM_LIST_ELEMENTS]   = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5640         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5641 };
5642
5643 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5644                                   const struct nft_set *set,
5645                                   const struct nft_set_ext *ext,
5646                                   bool reset)
5647 {
5648         struct nft_set_elem_expr *elem_expr;
5649         u32 size, num_exprs = 0;
5650         struct nft_expr *expr;
5651         struct nlattr *nest;
5652
5653         elem_expr = nft_set_ext_expr(ext);
5654         nft_setelem_expr_foreach(expr, elem_expr, size)
5655                 num_exprs++;
5656
5657         if (num_exprs == 1) {
5658                 expr = nft_setelem_expr_at(elem_expr, 0);
5659                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5660                         return -1;
5661
5662                 return 0;
5663         } else if (num_exprs > 1) {
5664                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5665                 if (nest == NULL)
5666                         goto nla_put_failure;
5667
5668                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5669                         expr = nft_setelem_expr_at(elem_expr, size);
5670                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5671                                 goto nla_put_failure;
5672                 }
5673                 nla_nest_end(skb, nest);
5674         }
5675         return 0;
5676
5677 nla_put_failure:
5678         return -1;
5679 }
5680
5681 static int nf_tables_fill_setelem(struct sk_buff *skb,
5682                                   const struct nft_set *set,
5683                                   const struct nft_elem_priv *elem_priv,
5684                                   bool reset)
5685 {
5686         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5687         unsigned char *b = skb_tail_pointer(skb);
5688         struct nlattr *nest;
5689
5690         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5691         if (nest == NULL)
5692                 goto nla_put_failure;
5693
5694         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5695             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5696                           NFT_DATA_VALUE, set->klen) < 0)
5697                 goto nla_put_failure;
5698
5699         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5700             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5701                           NFT_DATA_VALUE, set->klen) < 0)
5702                 goto nla_put_failure;
5703
5704         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5705             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5706                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5707                           set->dlen) < 0)
5708                 goto nla_put_failure;
5709
5710         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5711             nft_set_elem_expr_dump(skb, set, ext, reset))
5712                 goto nla_put_failure;
5713
5714         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5715             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5716                            (*nft_set_ext_obj(ext))->key.name) < 0)
5717                 goto nla_put_failure;
5718
5719         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5720             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5721                          htonl(*nft_set_ext_flags(ext))))
5722                 goto nla_put_failure;
5723
5724         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5725             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5726                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5727                          NFTA_SET_ELEM_PAD))
5728                 goto nla_put_failure;
5729
5730         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5731                 u64 expires, now = get_jiffies_64();
5732
5733                 expires = *nft_set_ext_expiration(ext);
5734                 if (time_before64(now, expires))
5735                         expires -= now;
5736                 else
5737                         expires = 0;
5738
5739                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5740                                  nf_jiffies64_to_msecs(expires),
5741                                  NFTA_SET_ELEM_PAD))
5742                         goto nla_put_failure;
5743         }
5744
5745         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5746                 struct nft_userdata *udata;
5747
5748                 udata = nft_set_ext_userdata(ext);
5749                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5750                             udata->len + 1, udata->data))
5751                         goto nla_put_failure;
5752         }
5753
5754         nla_nest_end(skb, nest);
5755         return 0;
5756
5757 nla_put_failure:
5758         nlmsg_trim(skb, b);
5759         return -EMSGSIZE;
5760 }
5761
5762 struct nft_set_dump_args {
5763         const struct netlink_callback   *cb;
5764         struct nft_set_iter             iter;
5765         struct sk_buff                  *skb;
5766         bool                            reset;
5767 };
5768
5769 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5770                                   struct nft_set *set,
5771                                   const struct nft_set_iter *iter,
5772                                   struct nft_elem_priv *elem_priv)
5773 {
5774         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5775         struct nft_set_dump_args *args;
5776
5777         if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5778                 return 0;
5779
5780         args = container_of(iter, struct nft_set_dump_args, iter);
5781         return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
5782 }
5783
5784 static void audit_log_nft_set_reset(const struct nft_table *table,
5785                                     unsigned int base_seq,
5786                                     unsigned int nentries)
5787 {
5788         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5789
5790         audit_log_nfcfg(buf, table->family, nentries,
5791                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5792         kfree(buf);
5793 }
5794
5795 struct nft_set_dump_ctx {
5796         const struct nft_set    *set;
5797         struct nft_ctx          ctx;
5798         bool                    reset;
5799 };
5800
5801 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5802                                  const struct nft_set *set, bool reset,
5803                                  unsigned int base_seq)
5804 {
5805         struct nft_set_elem_catchall *catchall;
5806         u8 genmask = nft_genmask_cur(net);
5807         struct nft_set_ext *ext;
5808         int ret = 0;
5809
5810         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5811                 ext = nft_set_elem_ext(set, catchall->elem);
5812                 if (!nft_set_elem_active(ext, genmask) ||
5813                     nft_set_elem_expired(ext))
5814                         continue;
5815
5816                 ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
5817                 if (reset && !ret)
5818                         audit_log_nft_set_reset(set->table, base_seq, 1);
5819                 break;
5820         }
5821
5822         return ret;
5823 }
5824
5825 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5826 {
5827         struct nft_set_dump_ctx *dump_ctx = cb->data;
5828         struct net *net = sock_net(skb->sk);
5829         struct nftables_pernet *nft_net;
5830         struct nft_table *table;
5831         struct nft_set *set;
5832         struct nft_set_dump_args args;
5833         bool set_found = false;
5834         struct nlmsghdr *nlh;
5835         struct nlattr *nest;
5836         u32 portid, seq;
5837         int event;
5838
5839         rcu_read_lock();
5840         nft_net = nft_pernet(net);
5841         cb->seq = READ_ONCE(nft_net->base_seq);
5842
5843         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5844                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5845                     dump_ctx->ctx.family != table->family)
5846                         continue;
5847
5848                 if (table != dump_ctx->ctx.table)
5849                         continue;
5850
5851                 list_for_each_entry_rcu(set, &table->sets, list) {
5852                         if (set == dump_ctx->set) {
5853                                 set_found = true;
5854                                 break;
5855                         }
5856                 }
5857                 break;
5858         }
5859
5860         if (!set_found) {
5861                 rcu_read_unlock();
5862                 return -ENOENT;
5863         }
5864
5865         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5866         portid = NETLINK_CB(cb->skb).portid;
5867         seq    = cb->nlh->nlmsg_seq;
5868
5869         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5870                            table->family, NFNETLINK_V0, nft_base_seq(net));
5871         if (!nlh)
5872                 goto nla_put_failure;
5873
5874         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5875                 goto nla_put_failure;
5876         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5877                 goto nla_put_failure;
5878
5879         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5880         if (nest == NULL)
5881                 goto nla_put_failure;
5882
5883         args.cb                 = cb;
5884         args.skb                = skb;
5885         args.reset              = dump_ctx->reset;
5886         args.iter.genmask       = nft_genmask_cur(net);
5887         args.iter.skip          = cb->args[0];
5888         args.iter.count         = 0;
5889         args.iter.err           = 0;
5890         args.iter.fn            = nf_tables_dump_setelem;
5891         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5892
5893         if (!args.iter.err && args.iter.count == cb->args[0])
5894                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5895                                                       dump_ctx->reset, cb->seq);
5896         nla_nest_end(skb, nest);
5897         nlmsg_end(skb, nlh);
5898
5899         rcu_read_unlock();
5900
5901         if (args.iter.err && args.iter.err != -EMSGSIZE)
5902                 return args.iter.err;
5903         if (args.iter.count == cb->args[0])
5904                 return 0;
5905
5906         cb->args[0] = args.iter.count;
5907         return skb->len;
5908
5909 nla_put_failure:
5910         rcu_read_unlock();
5911         return -ENOSPC;
5912 }
5913
5914 static int nf_tables_dumpreset_set(struct sk_buff *skb,
5915                                    struct netlink_callback *cb)
5916 {
5917         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
5918         struct nft_set_dump_ctx *dump_ctx = cb->data;
5919         int ret, skip = cb->args[0];
5920
5921         mutex_lock(&nft_net->commit_mutex);
5922
5923         ret = nf_tables_dump_set(skb, cb);
5924
5925         if (cb->args[0] > skip)
5926                 audit_log_nft_set_reset(dump_ctx->ctx.table, cb->seq,
5927                                         cb->args[0] - skip);
5928
5929         mutex_unlock(&nft_net->commit_mutex);
5930
5931         return ret;
5932 }
5933
5934 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5935 {
5936         struct nft_set_dump_ctx *dump_ctx = cb->data;
5937
5938         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5939
5940         return cb->data ? 0 : -ENOMEM;
5941 }
5942
5943 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5944 {
5945         kfree(cb->data);
5946         return 0;
5947 }
5948
5949 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5950                                        const struct nft_ctx *ctx, u32 seq,
5951                                        u32 portid, int event, u16 flags,
5952                                        const struct nft_set *set,
5953                                        const struct nft_elem_priv *elem_priv,
5954                                        bool reset)
5955 {
5956         struct nlmsghdr *nlh;
5957         struct nlattr *nest;
5958         int err;
5959
5960         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5961         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5962                            NFNETLINK_V0, nft_base_seq(ctx->net));
5963         if (!nlh)
5964                 goto nla_put_failure;
5965
5966         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5967                 goto nla_put_failure;
5968         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5969                 goto nla_put_failure;
5970
5971         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5972         if (nest == NULL)
5973                 goto nla_put_failure;
5974
5975         err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
5976         if (err < 0)
5977                 goto nla_put_failure;
5978
5979         nla_nest_end(skb, nest);
5980
5981         nlmsg_end(skb, nlh);
5982         return 0;
5983
5984 nla_put_failure:
5985         nlmsg_trim(skb, nlh);
5986         return -1;
5987 }
5988
5989 static int nft_setelem_parse_flags(const struct nft_set *set,
5990                                    const struct nlattr *attr, u32 *flags)
5991 {
5992         if (attr == NULL)
5993                 return 0;
5994
5995         *flags = ntohl(nla_get_be32(attr));
5996         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5997                 return -EOPNOTSUPP;
5998         if (!(set->flags & NFT_SET_INTERVAL) &&
5999             *flags & NFT_SET_ELEM_INTERVAL_END)
6000                 return -EINVAL;
6001         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
6002             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
6003                 return -EINVAL;
6004
6005         return 0;
6006 }
6007
6008 static int nft_setelem_parse_key(struct nft_ctx *ctx, const struct nft_set *set,
6009                                  struct nft_data *key, struct nlattr *attr)
6010 {
6011         struct nft_data_desc desc = {
6012                 .type   = NFT_DATA_VALUE,
6013                 .size   = NFT_DATA_VALUE_MAXLEN,
6014                 .len    = set->klen,
6015         };
6016
6017         return nft_data_init(ctx, key, &desc, attr);
6018 }
6019
6020 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
6021                                   struct nft_data_desc *desc,
6022                                   struct nft_data *data,
6023                                   struct nlattr *attr)
6024 {
6025         u32 dtype;
6026
6027         if (set->dtype == NFT_DATA_VERDICT)
6028                 dtype = NFT_DATA_VERDICT;
6029         else
6030                 dtype = NFT_DATA_VALUE;
6031
6032         desc->type = dtype;
6033         desc->size = NFT_DATA_VALUE_MAXLEN;
6034         desc->len = set->dlen;
6035         desc->flags = NFT_DATA_DESC_SETELEM;
6036
6037         return nft_data_init(ctx, data, desc, attr);
6038 }
6039
6040 static void *nft_setelem_catchall_get(const struct net *net,
6041                                       const struct nft_set *set)
6042 {
6043         struct nft_set_elem_catchall *catchall;
6044         u8 genmask = nft_genmask_cur(net);
6045         struct nft_set_ext *ext;
6046         void *priv = NULL;
6047
6048         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6049                 ext = nft_set_elem_ext(set, catchall->elem);
6050                 if (!nft_set_elem_active(ext, genmask) ||
6051                     nft_set_elem_expired(ext))
6052                         continue;
6053
6054                 priv = catchall->elem;
6055                 break;
6056         }
6057
6058         return priv;
6059 }
6060
6061 static int nft_setelem_get(struct nft_ctx *ctx, const struct nft_set *set,
6062                            struct nft_set_elem *elem, u32 flags)
6063 {
6064         void *priv;
6065
6066         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6067                 priv = set->ops->get(ctx->net, set, elem, flags);
6068                 if (IS_ERR(priv))
6069                         return PTR_ERR(priv);
6070         } else {
6071                 priv = nft_setelem_catchall_get(ctx->net, set);
6072                 if (!priv)
6073                         return -ENOENT;
6074         }
6075         elem->priv = priv;
6076
6077         return 0;
6078 }
6079
6080 static int nft_get_set_elem(struct nft_ctx *ctx, const struct nft_set *set,
6081                             const struct nlattr *attr, bool reset)
6082 {
6083         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6084         struct nft_set_elem elem;
6085         struct sk_buff *skb;
6086         uint32_t flags = 0;
6087         int err;
6088
6089         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6090                                           nft_set_elem_policy, NULL);
6091         if (err < 0)
6092                 return err;
6093
6094         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6095         if (err < 0)
6096                 return err;
6097
6098         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6099                 return -EINVAL;
6100
6101         if (nla[NFTA_SET_ELEM_KEY]) {
6102                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6103                                             nla[NFTA_SET_ELEM_KEY]);
6104                 if (err < 0)
6105                         return err;
6106         }
6107
6108         if (nla[NFTA_SET_ELEM_KEY_END]) {
6109                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6110                                             nla[NFTA_SET_ELEM_KEY_END]);
6111                 if (err < 0)
6112                         return err;
6113         }
6114
6115         err = nft_setelem_get(ctx, set, &elem, flags);
6116         if (err < 0)
6117                 return err;
6118
6119         err = -ENOMEM;
6120         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6121         if (skb == NULL)
6122                 return err;
6123
6124         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6125                                           NFT_MSG_NEWSETELEM, 0, set, elem.priv,
6126                                           reset);
6127         if (err < 0)
6128                 goto err_fill_setelem;
6129
6130         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6131
6132 err_fill_setelem:
6133         kfree_skb(skb);
6134         return err;
6135 }
6136
6137 static int nft_set_dump_ctx_init(struct nft_set_dump_ctx *dump_ctx,
6138                                  const struct sk_buff *skb,
6139                                  const struct nfnl_info *info,
6140                                  const struct nlattr * const nla[],
6141                                  bool reset)
6142 {
6143         struct netlink_ext_ack *extack = info->extack;
6144         u8 genmask = nft_genmask_cur(info->net);
6145         u8 family = info->nfmsg->nfgen_family;
6146         struct net *net = info->net;
6147         struct nft_table *table;
6148         struct nft_set *set;
6149
6150         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6151                                  genmask, 0);
6152         if (IS_ERR(table)) {
6153                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6154                 return PTR_ERR(table);
6155         }
6156
6157         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6158         if (IS_ERR(set)) {
6159                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6160                 return PTR_ERR(set);
6161         }
6162
6163         nft_ctx_init(&dump_ctx->ctx, net, skb,
6164                      info->nlh, family, table, NULL, nla);
6165         dump_ctx->set = set;
6166         dump_ctx->reset = reset;
6167         return 0;
6168 }
6169
6170 /* called with rcu_read_lock held */
6171 static int nf_tables_getsetelem(struct sk_buff *skb,
6172                                 const struct nfnl_info *info,
6173                                 const struct nlattr * const nla[])
6174 {
6175         struct netlink_ext_ack *extack = info->extack;
6176         struct nft_set_dump_ctx dump_ctx;
6177         struct nlattr *attr;
6178         int rem, err = 0;
6179
6180         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6181                 struct netlink_dump_control c = {
6182                         .start = nf_tables_dump_set_start,
6183                         .dump = nf_tables_dump_set,
6184                         .done = nf_tables_dump_set_done,
6185                         .module = THIS_MODULE,
6186                 };
6187
6188                 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6189                 if (err)
6190                         return err;
6191
6192                 c.data = &dump_ctx;
6193                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6194         }
6195
6196         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6197                 return -EINVAL;
6198
6199         err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6200         if (err)
6201                 return err;
6202
6203         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6204                 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, false);
6205                 if (err < 0) {
6206                         NL_SET_BAD_ATTR(extack, attr);
6207                         break;
6208                 }
6209         }
6210
6211         return err;
6212 }
6213
6214 static int nf_tables_getsetelem_reset(struct sk_buff *skb,
6215                                       const struct nfnl_info *info,
6216                                       const struct nlattr * const nla[])
6217 {
6218         struct nftables_pernet *nft_net = nft_pernet(info->net);
6219         struct netlink_ext_ack *extack = info->extack;
6220         struct nft_set_dump_ctx dump_ctx;
6221         int rem, err = 0, nelems = 0;
6222         struct nlattr *attr;
6223
6224         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6225                 struct netlink_dump_control c = {
6226                         .start = nf_tables_dump_set_start,
6227                         .dump = nf_tables_dumpreset_set,
6228                         .done = nf_tables_dump_set_done,
6229                         .module = THIS_MODULE,
6230                 };
6231
6232                 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6233                 if (err)
6234                         return err;
6235
6236                 c.data = &dump_ctx;
6237                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6238         }
6239
6240         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6241                 return -EINVAL;
6242
6243         if (!try_module_get(THIS_MODULE))
6244                 return -EINVAL;
6245         rcu_read_unlock();
6246         mutex_lock(&nft_net->commit_mutex);
6247         rcu_read_lock();
6248
6249         err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6250         if (err)
6251                 goto out_unlock;
6252
6253         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6254                 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, true);
6255                 if (err < 0) {
6256                         NL_SET_BAD_ATTR(extack, attr);
6257                         break;
6258                 }
6259                 nelems++;
6260         }
6261         audit_log_nft_set_reset(dump_ctx.ctx.table, nft_net->base_seq, nelems);
6262
6263 out_unlock:
6264         rcu_read_unlock();
6265         mutex_unlock(&nft_net->commit_mutex);
6266         rcu_read_lock();
6267         module_put(THIS_MODULE);
6268
6269         return err;
6270 }
6271
6272 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6273                                      const struct nft_set *set,
6274                                      const struct nft_elem_priv *elem_priv,
6275                                      int event)
6276 {
6277         struct nftables_pernet *nft_net;
6278         struct net *net = ctx->net;
6279         u32 portid = ctx->portid;
6280         struct sk_buff *skb;
6281         u16 flags = 0;
6282         int err;
6283
6284         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6285                 return;
6286
6287         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6288         if (skb == NULL)
6289                 goto err;
6290
6291         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6292                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6293
6294         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6295                                           set, elem_priv, false);
6296         if (err < 0) {
6297                 kfree_skb(skb);
6298                 goto err;
6299         }
6300
6301         nft_net = nft_pernet(net);
6302         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6303         return;
6304 err:
6305         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6306 }
6307
6308 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6309                                               int msg_type,
6310                                               struct nft_set *set)
6311 {
6312         struct nft_trans *trans;
6313
6314         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6315         if (trans == NULL)
6316                 return NULL;
6317
6318         nft_trans_elem_set(trans) = set;
6319         return trans;
6320 }
6321
6322 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6323                                          const struct nft_set *set,
6324                                          const struct nlattr *attr)
6325 {
6326         struct nft_expr *expr;
6327         int err;
6328
6329         expr = nft_expr_init(ctx, attr);
6330         if (IS_ERR(expr))
6331                 return expr;
6332
6333         err = -EOPNOTSUPP;
6334         if (expr->ops->type->flags & NFT_EXPR_GC) {
6335                 if (set->flags & NFT_SET_TIMEOUT)
6336                         goto err_set_elem_expr;
6337                 if (!set->ops->gc_init)
6338                         goto err_set_elem_expr;
6339                 set->ops->gc_init(set);
6340         }
6341
6342         return expr;
6343
6344 err_set_elem_expr:
6345         nft_expr_destroy(ctx, expr);
6346         return ERR_PTR(err);
6347 }
6348
6349 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6350 {
6351         len += nft_set_ext_types[id].len;
6352         if (len > tmpl->ext_len[id] ||
6353             len > U8_MAX)
6354                 return -1;
6355
6356         return 0;
6357 }
6358
6359 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6360                               void *to, const void *from, u32 len)
6361 {
6362         if (nft_set_ext_check(tmpl, id, len) < 0)
6363                 return -1;
6364
6365         memcpy(to, from, len);
6366
6367         return 0;
6368 }
6369
6370 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
6371                                         const struct nft_set_ext_tmpl *tmpl,
6372                                         const u32 *key, const u32 *key_end,
6373                                         const u32 *data,
6374                                         u64 timeout, u64 expiration, gfp_t gfp)
6375 {
6376         struct nft_set_ext *ext;
6377         void *elem;
6378
6379         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6380         if (elem == NULL)
6381                 return ERR_PTR(-ENOMEM);
6382
6383         ext = nft_set_elem_ext(set, elem);
6384         nft_set_ext_init(ext, tmpl);
6385
6386         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6387             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6388                                nft_set_ext_key(ext), key, set->klen) < 0)
6389                 goto err_ext_check;
6390
6391         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6392             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6393                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6394                 goto err_ext_check;
6395
6396         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6397             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6398                                nft_set_ext_data(ext), data, set->dlen) < 0)
6399                 goto err_ext_check;
6400
6401         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6402                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6403                 if (expiration == 0)
6404                         *nft_set_ext_expiration(ext) += timeout;
6405         }
6406         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6407                 *nft_set_ext_timeout(ext) = timeout;
6408
6409         return elem;
6410
6411 err_ext_check:
6412         kfree(elem);
6413
6414         return ERR_PTR(-EINVAL);
6415 }
6416
6417 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6418                                         struct nft_expr *expr)
6419 {
6420         if (expr->ops->destroy_clone) {
6421                 expr->ops->destroy_clone(ctx, expr);
6422                 module_put(expr->ops->type->owner);
6423         } else {
6424                 nf_tables_expr_destroy(ctx, expr);
6425         }
6426 }
6427
6428 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6429                                       struct nft_set_elem_expr *elem_expr)
6430 {
6431         struct nft_expr *expr;
6432         u32 size;
6433
6434         nft_setelem_expr_foreach(expr, elem_expr, size)
6435                 __nft_set_elem_expr_destroy(ctx, expr);
6436 }
6437
6438 /* Drop references and destroy. Called from gc, dynset and abort path. */
6439 void nft_set_elem_destroy(const struct nft_set *set,
6440                           const struct nft_elem_priv *elem_priv,
6441                           bool destroy_expr)
6442 {
6443         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6444         struct nft_ctx ctx = {
6445                 .net    = read_pnet(&set->net),
6446                 .family = set->table->family,
6447         };
6448
6449         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6450         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6451                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6452         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6453                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6454         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6455                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6456
6457         kfree(elem_priv);
6458 }
6459 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6460
6461 /* Destroy element. References have been already dropped in the preparation
6462  * path via nft_setelem_data_deactivate().
6463  */
6464 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6465                                 const struct nft_set *set,
6466                                 const struct nft_elem_priv *elem_priv)
6467 {
6468         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6469
6470         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6471                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6472
6473         kfree(elem_priv);
6474 }
6475
6476 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6477                             struct nft_expr *expr_array[])
6478 {
6479         struct nft_expr *expr;
6480         int err, i, k;
6481
6482         for (i = 0; i < set->num_exprs; i++) {
6483                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6484                 if (!expr)
6485                         goto err_expr;
6486
6487                 err = nft_expr_clone(expr, set->exprs[i]);
6488                 if (err < 0) {
6489                         kfree(expr);
6490                         goto err_expr;
6491                 }
6492                 expr_array[i] = expr;
6493         }
6494
6495         return 0;
6496
6497 err_expr:
6498         for (k = i - 1; k >= 0; k--)
6499                 nft_expr_destroy(ctx, expr_array[k]);
6500
6501         return -ENOMEM;
6502 }
6503
6504 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6505                                    const struct nft_set_ext_tmpl *tmpl,
6506                                    const struct nft_set_ext *ext,
6507                                    struct nft_expr *expr_array[],
6508                                    u32 num_exprs)
6509 {
6510         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6511         u32 len = sizeof(struct nft_set_elem_expr);
6512         struct nft_expr *expr;
6513         int i, err;
6514
6515         if (num_exprs == 0)
6516                 return 0;
6517
6518         for (i = 0; i < num_exprs; i++)
6519                 len += expr_array[i]->ops->size;
6520
6521         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6522                 return -EINVAL;
6523
6524         for (i = 0; i < num_exprs; i++) {
6525                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6526                 err = nft_expr_clone(expr, expr_array[i]);
6527                 if (err < 0)
6528                         goto err_elem_expr_setup;
6529
6530                 elem_expr->size += expr_array[i]->ops->size;
6531                 nft_expr_destroy(ctx, expr_array[i]);
6532                 expr_array[i] = NULL;
6533         }
6534
6535         return 0;
6536
6537 err_elem_expr_setup:
6538         for (; i < num_exprs; i++) {
6539                 nft_expr_destroy(ctx, expr_array[i]);
6540                 expr_array[i] = NULL;
6541         }
6542
6543         return -ENOMEM;
6544 }
6545
6546 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6547                                             const struct nft_set *set)
6548 {
6549         struct nft_set_elem_catchall *catchall;
6550         u8 genmask = nft_genmask_cur(net);
6551         struct nft_set_ext *ext;
6552
6553         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6554                 ext = nft_set_elem_ext(set, catchall->elem);
6555                 if (nft_set_elem_active(ext, genmask) &&
6556                     !nft_set_elem_expired(ext) &&
6557                     !nft_set_elem_is_dead(ext))
6558                         return ext;
6559         }
6560
6561         return NULL;
6562 }
6563 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6564
6565 static int nft_setelem_catchall_insert(const struct net *net,
6566                                        struct nft_set *set,
6567                                        const struct nft_set_elem *elem,
6568                                        struct nft_elem_priv **priv)
6569 {
6570         struct nft_set_elem_catchall *catchall;
6571         u8 genmask = nft_genmask_next(net);
6572         struct nft_set_ext *ext;
6573
6574         list_for_each_entry(catchall, &set->catchall_list, list) {
6575                 ext = nft_set_elem_ext(set, catchall->elem);
6576                 if (nft_set_elem_active(ext, genmask)) {
6577                         *priv = catchall->elem;
6578                         return -EEXIST;
6579                 }
6580         }
6581
6582         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6583         if (!catchall)
6584                 return -ENOMEM;
6585
6586         catchall->elem = elem->priv;
6587         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6588
6589         return 0;
6590 }
6591
6592 static int nft_setelem_insert(const struct net *net,
6593                               struct nft_set *set,
6594                               const struct nft_set_elem *elem,
6595                               struct nft_elem_priv **elem_priv,
6596                               unsigned int flags)
6597 {
6598         int ret;
6599
6600         if (flags & NFT_SET_ELEM_CATCHALL)
6601                 ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
6602         else
6603                 ret = set->ops->insert(net, set, elem, elem_priv);
6604
6605         return ret;
6606 }
6607
6608 static bool nft_setelem_is_catchall(const struct nft_set *set,
6609                                     const struct nft_elem_priv *elem_priv)
6610 {
6611         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6612
6613         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6614             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6615                 return true;
6616
6617         return false;
6618 }
6619
6620 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6621                                  struct nft_elem_priv *elem_priv)
6622 {
6623         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6624
6625         if (nft_setelem_is_catchall(set, elem_priv)) {
6626                 nft_set_elem_change_active(net, set, ext);
6627         } else {
6628                 set->ops->activate(net, set, elem_priv);
6629         }
6630 }
6631
6632 static int nft_setelem_catchall_deactivate(const struct net *net,
6633                                            struct nft_set *set,
6634                                            struct nft_set_elem *elem)
6635 {
6636         struct nft_set_elem_catchall *catchall;
6637         struct nft_set_ext *ext;
6638
6639         list_for_each_entry(catchall, &set->catchall_list, list) {
6640                 ext = nft_set_elem_ext(set, catchall->elem);
6641                 if (!nft_is_active_next(net, ext))
6642                         continue;
6643
6644                 kfree(elem->priv);
6645                 elem->priv = catchall->elem;
6646                 nft_set_elem_change_active(net, set, ext);
6647                 return 0;
6648         }
6649
6650         return -ENOENT;
6651 }
6652
6653 static int __nft_setelem_deactivate(const struct net *net,
6654                                     struct nft_set *set,
6655                                     struct nft_set_elem *elem)
6656 {
6657         void *priv;
6658
6659         priv = set->ops->deactivate(net, set, elem);
6660         if (!priv)
6661                 return -ENOENT;
6662
6663         kfree(elem->priv);
6664         elem->priv = priv;
6665         set->ndeact++;
6666
6667         return 0;
6668 }
6669
6670 static int nft_setelem_deactivate(const struct net *net,
6671                                   struct nft_set *set,
6672                                   struct nft_set_elem *elem, u32 flags)
6673 {
6674         int ret;
6675
6676         if (flags & NFT_SET_ELEM_CATCHALL)
6677                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6678         else
6679                 ret = __nft_setelem_deactivate(net, set, elem);
6680
6681         return ret;
6682 }
6683
6684 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6685 {
6686         list_del_rcu(&catchall->list);
6687         kfree_rcu(catchall, rcu);
6688 }
6689
6690 static void nft_setelem_catchall_remove(const struct net *net,
6691                                         const struct nft_set *set,
6692                                         struct nft_elem_priv *elem_priv)
6693 {
6694         struct nft_set_elem_catchall *catchall, *next;
6695
6696         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6697                 if (catchall->elem == elem_priv) {
6698                         nft_setelem_catchall_destroy(catchall);
6699                         break;
6700                 }
6701         }
6702 }
6703
6704 static void nft_setelem_remove(const struct net *net,
6705                                const struct nft_set *set,
6706                                struct nft_elem_priv *elem_priv)
6707 {
6708         if (nft_setelem_is_catchall(set, elem_priv))
6709                 nft_setelem_catchall_remove(net, set, elem_priv);
6710         else
6711                 set->ops->remove(net, set, elem_priv);
6712 }
6713
6714 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6715                                       struct nlattr **nla, u32 flags)
6716 {
6717         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6718                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6719                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6720                         return false;
6721
6722                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6723                     flags & NFT_SET_ELEM_CATCHALL)
6724                         return false;
6725         } else {
6726                 if (nla[NFTA_SET_ELEM_KEY_END])
6727                         return false;
6728         }
6729
6730         return true;
6731 }
6732
6733 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6734                             const struct nlattr *attr, u32 nlmsg_flags)
6735 {
6736         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6737         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6738         u8 genmask = nft_genmask_next(ctx->net);
6739         u32 flags = 0, size = 0, num_exprs = 0;
6740         struct nft_set_ext_tmpl tmpl;
6741         struct nft_set_ext *ext, *ext2;
6742         struct nft_set_elem elem;
6743         struct nft_set_binding *binding;
6744         struct nft_elem_priv *elem_priv;
6745         struct nft_object *obj = NULL;
6746         struct nft_userdata *udata;
6747         struct nft_data_desc desc;
6748         enum nft_registers dreg;
6749         struct nft_trans *trans;
6750         u64 expiration;
6751         u64 timeout;
6752         int err, i;
6753         u8 ulen;
6754
6755         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6756                                           nft_set_elem_policy, NULL);
6757         if (err < 0)
6758                 return err;
6759
6760         nft_set_ext_prepare(&tmpl);
6761
6762         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6763         if (err < 0)
6764                 return err;
6765
6766         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6767             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6768                 return -EINVAL;
6769
6770         if (flags != 0) {
6771                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6772                 if (err < 0)
6773                         return err;
6774         }
6775
6776         if (set->flags & NFT_SET_MAP) {
6777                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6778                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6779                         return -EINVAL;
6780         } else {
6781                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6782                         return -EINVAL;
6783         }
6784
6785         if (set->flags & NFT_SET_OBJECT) {
6786                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6787                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6788                         return -EINVAL;
6789         } else {
6790                 if (nla[NFTA_SET_ELEM_OBJREF])
6791                         return -EINVAL;
6792         }
6793
6794         if (!nft_setelem_valid_key_end(set, nla, flags))
6795                 return -EINVAL;
6796
6797         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6798              (nla[NFTA_SET_ELEM_DATA] ||
6799               nla[NFTA_SET_ELEM_OBJREF] ||
6800               nla[NFTA_SET_ELEM_TIMEOUT] ||
6801               nla[NFTA_SET_ELEM_EXPIRATION] ||
6802               nla[NFTA_SET_ELEM_USERDATA] ||
6803               nla[NFTA_SET_ELEM_EXPR] ||
6804               nla[NFTA_SET_ELEM_KEY_END] ||
6805               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6806                 return -EINVAL;
6807
6808         timeout = 0;
6809         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6810                 if (!(set->flags & NFT_SET_TIMEOUT))
6811                         return -EINVAL;
6812                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6813                                             &timeout);
6814                 if (err)
6815                         return err;
6816         } else if (set->flags & NFT_SET_TIMEOUT &&
6817                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6818                 timeout = READ_ONCE(set->timeout);
6819         }
6820
6821         expiration = 0;
6822         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6823                 if (!(set->flags & NFT_SET_TIMEOUT))
6824                         return -EINVAL;
6825                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6826                                             &expiration);
6827                 if (err)
6828                         return err;
6829         }
6830
6831         if (nla[NFTA_SET_ELEM_EXPR]) {
6832                 struct nft_expr *expr;
6833
6834                 if (set->num_exprs && set->num_exprs != 1)
6835                         return -EOPNOTSUPP;
6836
6837                 expr = nft_set_elem_expr_alloc(ctx, set,
6838                                                nla[NFTA_SET_ELEM_EXPR]);
6839                 if (IS_ERR(expr))
6840                         return PTR_ERR(expr);
6841
6842                 expr_array[0] = expr;
6843                 num_exprs = 1;
6844
6845                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6846                         err = -EOPNOTSUPP;
6847                         goto err_set_elem_expr;
6848                 }
6849         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6850                 struct nft_expr *expr;
6851                 struct nlattr *tmp;
6852                 int left;
6853
6854                 i = 0;
6855                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6856                         if (i == NFT_SET_EXPR_MAX ||
6857                             (set->num_exprs && set->num_exprs == i)) {
6858                                 err = -E2BIG;
6859                                 goto err_set_elem_expr;
6860                         }
6861                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6862                                 err = -EINVAL;
6863                                 goto err_set_elem_expr;
6864                         }
6865                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6866                         if (IS_ERR(expr)) {
6867                                 err = PTR_ERR(expr);
6868                                 goto err_set_elem_expr;
6869                         }
6870                         expr_array[i] = expr;
6871                         num_exprs++;
6872
6873                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6874                                 err = -EOPNOTSUPP;
6875                                 goto err_set_elem_expr;
6876                         }
6877                         i++;
6878                 }
6879                 if (set->num_exprs && set->num_exprs != i) {
6880                         err = -EOPNOTSUPP;
6881                         goto err_set_elem_expr;
6882                 }
6883         } else if (set->num_exprs > 0 &&
6884                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6885                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6886                 if (err < 0)
6887                         goto err_set_elem_expr_clone;
6888
6889                 num_exprs = set->num_exprs;
6890         }
6891
6892         if (nla[NFTA_SET_ELEM_KEY]) {
6893                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6894                                             nla[NFTA_SET_ELEM_KEY]);
6895                 if (err < 0)
6896                         goto err_set_elem_expr;
6897
6898                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6899                 if (err < 0)
6900                         goto err_parse_key;
6901         }
6902
6903         if (nla[NFTA_SET_ELEM_KEY_END]) {
6904                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6905                                             nla[NFTA_SET_ELEM_KEY_END]);
6906                 if (err < 0)
6907                         goto err_parse_key;
6908
6909                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6910                 if (err < 0)
6911                         goto err_parse_key_end;
6912         }
6913
6914         if (timeout > 0) {
6915                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6916                 if (err < 0)
6917                         goto err_parse_key_end;
6918
6919                 if (timeout != READ_ONCE(set->timeout)) {
6920                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6921                         if (err < 0)
6922                                 goto err_parse_key_end;
6923                 }
6924         }
6925
6926         if (num_exprs) {
6927                 for (i = 0; i < num_exprs; i++)
6928                         size += expr_array[i]->ops->size;
6929
6930                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6931                                              sizeof(struct nft_set_elem_expr) + size);
6932                 if (err < 0)
6933                         goto err_parse_key_end;
6934         }
6935
6936         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6937                 obj = nft_obj_lookup(ctx->net, ctx->table,
6938                                      nla[NFTA_SET_ELEM_OBJREF],
6939                                      set->objtype, genmask);
6940                 if (IS_ERR(obj)) {
6941                         err = PTR_ERR(obj);
6942                         obj = NULL;
6943                         goto err_parse_key_end;
6944                 }
6945
6946                 if (!nft_use_inc(&obj->use)) {
6947                         err = -EMFILE;
6948                         obj = NULL;
6949                         goto err_parse_key_end;
6950                 }
6951
6952                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6953                 if (err < 0)
6954                         goto err_parse_key_end;
6955         }
6956
6957         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6958                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6959                                              nla[NFTA_SET_ELEM_DATA]);
6960                 if (err < 0)
6961                         goto err_parse_key_end;
6962
6963                 dreg = nft_type_to_reg(set->dtype);
6964                 list_for_each_entry(binding, &set->bindings, list) {
6965                         struct nft_ctx bind_ctx = {
6966                                 .net    = ctx->net,
6967                                 .family = ctx->family,
6968                                 .table  = ctx->table,
6969                                 .chain  = (struct nft_chain *)binding->chain,
6970                         };
6971
6972                         if (!(binding->flags & NFT_SET_MAP))
6973                                 continue;
6974
6975                         err = nft_validate_register_store(&bind_ctx, dreg,
6976                                                           &elem.data.val,
6977                                                           desc.type, desc.len);
6978                         if (err < 0)
6979                                 goto err_parse_data;
6980
6981                         if (desc.type == NFT_DATA_VERDICT &&
6982                             (elem.data.val.verdict.code == NFT_GOTO ||
6983                              elem.data.val.verdict.code == NFT_JUMP))
6984                                 nft_validate_state_update(ctx->table,
6985                                                           NFT_VALIDATE_NEED);
6986                 }
6987
6988                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6989                 if (err < 0)
6990                         goto err_parse_data;
6991         }
6992
6993         /* The full maximum length of userdata can exceed the maximum
6994          * offset value (U8_MAX) for following extensions, therefor it
6995          * must be the last extension added.
6996          */
6997         ulen = 0;
6998         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6999                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
7000                 if (ulen > 0) {
7001                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
7002                                                      ulen);
7003                         if (err < 0)
7004                                 goto err_parse_data;
7005                 }
7006         }
7007
7008         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7009                                       elem.key_end.val.data, elem.data.val.data,
7010                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
7011         if (IS_ERR(elem.priv)) {
7012                 err = PTR_ERR(elem.priv);
7013                 goto err_parse_data;
7014         }
7015
7016         ext = nft_set_elem_ext(set, elem.priv);
7017         if (flags)
7018                 *nft_set_ext_flags(ext) = flags;
7019
7020         if (obj)
7021                 *nft_set_ext_obj(ext) = obj;
7022
7023         if (ulen > 0) {
7024                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
7025                         err = -EINVAL;
7026                         goto err_elem_free;
7027                 }
7028                 udata = nft_set_ext_userdata(ext);
7029                 udata->len = ulen - 1;
7030                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
7031         }
7032         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
7033         if (err < 0)
7034                 goto err_elem_free;
7035
7036         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
7037         if (trans == NULL) {
7038                 err = -ENOMEM;
7039                 goto err_elem_free;
7040         }
7041
7042         ext->genmask = nft_genmask_cur(ctx->net);
7043
7044         err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
7045         if (err) {
7046                 if (err == -EEXIST) {
7047                         ext2 = nft_set_elem_ext(set, elem_priv);
7048                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
7049                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
7050                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
7051                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7052                                 goto err_element_clash;
7053                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
7054                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
7055                              memcmp(nft_set_ext_data(ext),
7056                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
7057                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
7058                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
7059                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
7060                                 goto err_element_clash;
7061                         else if (!(nlmsg_flags & NLM_F_EXCL))
7062                                 err = 0;
7063                 } else if (err == -ENOTEMPTY) {
7064                         /* ENOTEMPTY reports overlapping between this element
7065                          * and an existing one.
7066                          */
7067                         err = -EEXIST;
7068                 }
7069                 goto err_element_clash;
7070         }
7071
7072         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
7073                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
7074
7075                 if (!atomic_add_unless(&set->nelems, 1, max)) {
7076                         err = -ENFILE;
7077                         goto err_set_full;
7078                 }
7079         }
7080
7081         nft_trans_elem_priv(trans) = elem.priv;
7082         nft_trans_commit_list_add_tail(ctx->net, trans);
7083         return 0;
7084
7085 err_set_full:
7086         nft_setelem_remove(ctx->net, set, elem.priv);
7087 err_element_clash:
7088         kfree(trans);
7089 err_elem_free:
7090         nf_tables_set_elem_destroy(ctx, set, elem.priv);
7091 err_parse_data:
7092         if (nla[NFTA_SET_ELEM_DATA] != NULL)
7093                 nft_data_release(&elem.data.val, desc.type);
7094 err_parse_key_end:
7095         if (obj)
7096                 nft_use_dec_restore(&obj->use);
7097
7098         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7099 err_parse_key:
7100         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7101 err_set_elem_expr:
7102         for (i = 0; i < num_exprs && expr_array[i]; i++)
7103                 nft_expr_destroy(ctx, expr_array[i]);
7104 err_set_elem_expr_clone:
7105         return err;
7106 }
7107
7108 static int nf_tables_newsetelem(struct sk_buff *skb,
7109                                 const struct nfnl_info *info,
7110                                 const struct nlattr * const nla[])
7111 {
7112         struct netlink_ext_ack *extack = info->extack;
7113         u8 genmask = nft_genmask_next(info->net);
7114         u8 family = info->nfmsg->nfgen_family;
7115         struct net *net = info->net;
7116         const struct nlattr *attr;
7117         struct nft_table *table;
7118         struct nft_set *set;
7119         struct nft_ctx ctx;
7120         int rem, err;
7121
7122         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
7123                 return -EINVAL;
7124
7125         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7126                                  genmask, NETLINK_CB(skb).portid);
7127         if (IS_ERR(table)) {
7128                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7129                 return PTR_ERR(table);
7130         }
7131
7132         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7133                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7134         if (IS_ERR(set)) {
7135                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7136                 return PTR_ERR(set);
7137         }
7138
7139         if (!list_empty(&set->bindings) &&
7140             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7141                 return -EBUSY;
7142
7143         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7144
7145         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7146                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7147                 if (err < 0) {
7148                         NL_SET_BAD_ATTR(extack, attr);
7149                         return err;
7150                 }
7151         }
7152
7153         if (table->validate_state == NFT_VALIDATE_DO)
7154                 return nft_table_validate(net, table);
7155
7156         return 0;
7157 }
7158
7159 /**
7160  *      nft_data_hold - hold a nft_data item
7161  *
7162  *      @data: struct nft_data to release
7163  *      @type: type of data
7164  *
7165  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7166  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7167  *      NFT_GOTO verdicts. This function must be called on active data objects
7168  *      from the second phase of the commit protocol.
7169  */
7170 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7171 {
7172         struct nft_chain *chain;
7173
7174         if (type == NFT_DATA_VERDICT) {
7175                 switch (data->verdict.code) {
7176                 case NFT_JUMP:
7177                 case NFT_GOTO:
7178                         chain = data->verdict.chain;
7179                         nft_use_inc_restore(&chain->use);
7180                         break;
7181                 }
7182         }
7183 }
7184
7185 static void nft_setelem_data_activate(const struct net *net,
7186                                       const struct nft_set *set,
7187                                       struct nft_elem_priv *elem_priv)
7188 {
7189         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7190
7191         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7192                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7193         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7194                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7195 }
7196
7197 void nft_setelem_data_deactivate(const struct net *net,
7198                                  const struct nft_set *set,
7199                                  struct nft_elem_priv *elem_priv)
7200 {
7201         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7202
7203         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7204                 nft_data_release(nft_set_ext_data(ext), set->dtype);
7205         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7206                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7207 }
7208
7209 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7210                            const struct nlattr *attr)
7211 {
7212         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7213         struct nft_set_ext_tmpl tmpl;
7214         struct nft_set_elem elem;
7215         struct nft_set_ext *ext;
7216         struct nft_trans *trans;
7217         u32 flags = 0;
7218         int err;
7219
7220         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7221                                           nft_set_elem_policy, NULL);
7222         if (err < 0)
7223                 return err;
7224
7225         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7226         if (err < 0)
7227                 return err;
7228
7229         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7230                 return -EINVAL;
7231
7232         if (!nft_setelem_valid_key_end(set, nla, flags))
7233                 return -EINVAL;
7234
7235         nft_set_ext_prepare(&tmpl);
7236
7237         if (flags != 0) {
7238                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7239                 if (err < 0)
7240                         return err;
7241         }
7242
7243         if (nla[NFTA_SET_ELEM_KEY]) {
7244                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7245                                             nla[NFTA_SET_ELEM_KEY]);
7246                 if (err < 0)
7247                         return err;
7248
7249                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7250                 if (err < 0)
7251                         goto fail_elem;
7252         }
7253
7254         if (nla[NFTA_SET_ELEM_KEY_END]) {
7255                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7256                                             nla[NFTA_SET_ELEM_KEY_END]);
7257                 if (err < 0)
7258                         goto fail_elem;
7259
7260                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7261                 if (err < 0)
7262                         goto fail_elem_key_end;
7263         }
7264
7265         err = -ENOMEM;
7266         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7267                                       elem.key_end.val.data, NULL, 0, 0,
7268                                       GFP_KERNEL_ACCOUNT);
7269         if (IS_ERR(elem.priv)) {
7270                 err = PTR_ERR(elem.priv);
7271                 goto fail_elem_key_end;
7272         }
7273
7274         ext = nft_set_elem_ext(set, elem.priv);
7275         if (flags)
7276                 *nft_set_ext_flags(ext) = flags;
7277
7278         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7279         if (trans == NULL)
7280                 goto fail_trans;
7281
7282         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7283         if (err < 0)
7284                 goto fail_ops;
7285
7286         nft_setelem_data_deactivate(ctx->net, set, elem.priv);
7287
7288         nft_trans_elem_priv(trans) = elem.priv;
7289         nft_trans_commit_list_add_tail(ctx->net, trans);
7290         return 0;
7291
7292 fail_ops:
7293         kfree(trans);
7294 fail_trans:
7295         kfree(elem.priv);
7296 fail_elem_key_end:
7297         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7298 fail_elem:
7299         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7300         return err;
7301 }
7302
7303 static int nft_setelem_flush(const struct nft_ctx *ctx,
7304                              struct nft_set *set,
7305                              const struct nft_set_iter *iter,
7306                              struct nft_elem_priv *elem_priv)
7307 {
7308         struct nft_trans *trans;
7309
7310         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7311                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7312         if (!trans)
7313                 return -ENOMEM;
7314
7315         set->ops->flush(ctx->net, set, elem_priv);
7316         set->ndeact++;
7317
7318         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7319         nft_trans_elem_set(trans) = set;
7320         nft_trans_elem_priv(trans) = elem_priv;
7321         nft_trans_commit_list_add_tail(ctx->net, trans);
7322
7323         return 0;
7324 }
7325
7326 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7327                                     struct nft_set *set,
7328                                     struct nft_elem_priv *elem_priv)
7329 {
7330         struct nft_trans *trans;
7331
7332         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7333                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7334         if (!trans)
7335                 return -ENOMEM;
7336
7337         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7338         nft_trans_elem_set(trans) = set;
7339         nft_trans_elem_priv(trans) = elem_priv;
7340         nft_trans_commit_list_add_tail(ctx->net, trans);
7341
7342         return 0;
7343 }
7344
7345 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7346                                   struct nft_set *set)
7347 {
7348         u8 genmask = nft_genmask_next(ctx->net);
7349         struct nft_set_elem_catchall *catchall;
7350         struct nft_set_ext *ext;
7351         int ret = 0;
7352
7353         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7354                 ext = nft_set_elem_ext(set, catchall->elem);
7355                 if (!nft_set_elem_active(ext, genmask))
7356                         continue;
7357
7358                 ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
7359                 if (ret < 0)
7360                         break;
7361                 nft_set_elem_change_active(ctx->net, set, ext);
7362         }
7363
7364         return ret;
7365 }
7366
7367 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7368 {
7369         struct nft_set_iter iter = {
7370                 .genmask        = genmask,
7371                 .fn             = nft_setelem_flush,
7372         };
7373
7374         set->ops->walk(ctx, set, &iter);
7375         if (!iter.err)
7376                 iter.err = nft_set_catchall_flush(ctx, set);
7377
7378         return iter.err;
7379 }
7380
7381 static int nf_tables_delsetelem(struct sk_buff *skb,
7382                                 const struct nfnl_info *info,
7383                                 const struct nlattr * const nla[])
7384 {
7385         struct netlink_ext_ack *extack = info->extack;
7386         u8 genmask = nft_genmask_next(info->net);
7387         u8 family = info->nfmsg->nfgen_family;
7388         struct net *net = info->net;
7389         const struct nlattr *attr;
7390         struct nft_table *table;
7391         struct nft_set *set;
7392         struct nft_ctx ctx;
7393         int rem, err = 0;
7394
7395         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7396                                  genmask, NETLINK_CB(skb).portid);
7397         if (IS_ERR(table)) {
7398                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7399                 return PTR_ERR(table);
7400         }
7401
7402         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7403         if (IS_ERR(set)) {
7404                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7405                 return PTR_ERR(set);
7406         }
7407
7408         if (nft_set_is_anonymous(set))
7409                 return -EOPNOTSUPP;
7410
7411         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7412                 return -EBUSY;
7413
7414         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7415
7416         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7417                 return nft_set_flush(&ctx, set, genmask);
7418
7419         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7420                 err = nft_del_setelem(&ctx, set, attr);
7421                 if (err == -ENOENT &&
7422                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7423                         continue;
7424
7425                 if (err < 0) {
7426                         NL_SET_BAD_ATTR(extack, attr);
7427                         return err;
7428                 }
7429         }
7430
7431         return 0;
7432 }
7433
7434 /*
7435  * Stateful objects
7436  */
7437
7438 /**
7439  *      nft_register_obj- register nf_tables stateful object type
7440  *      @obj_type: object type
7441  *
7442  *      Registers the object type for use with nf_tables. Returns zero on
7443  *      success or a negative errno code otherwise.
7444  */
7445 int nft_register_obj(struct nft_object_type *obj_type)
7446 {
7447         if (obj_type->type == NFT_OBJECT_UNSPEC)
7448                 return -EINVAL;
7449
7450         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7451         list_add_rcu(&obj_type->list, &nf_tables_objects);
7452         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7453         return 0;
7454 }
7455 EXPORT_SYMBOL_GPL(nft_register_obj);
7456
7457 /**
7458  *      nft_unregister_obj - unregister nf_tables object type
7459  *      @obj_type: object type
7460  *
7461  *      Unregisters the object type for use with nf_tables.
7462  */
7463 void nft_unregister_obj(struct nft_object_type *obj_type)
7464 {
7465         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7466         list_del_rcu(&obj_type->list);
7467         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7468 }
7469 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7470
7471 struct nft_object *nft_obj_lookup(const struct net *net,
7472                                   const struct nft_table *table,
7473                                   const struct nlattr *nla, u32 objtype,
7474                                   u8 genmask)
7475 {
7476         struct nft_object_hash_key k = { .table = table };
7477         char search[NFT_OBJ_MAXNAMELEN];
7478         struct rhlist_head *tmp, *list;
7479         struct nft_object *obj;
7480
7481         nla_strscpy(search, nla, sizeof(search));
7482         k.name = search;
7483
7484         WARN_ON_ONCE(!rcu_read_lock_held() &&
7485                      !lockdep_commit_lock_is_held(net));
7486
7487         rcu_read_lock();
7488         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7489         if (!list)
7490                 goto out;
7491
7492         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7493                 if (objtype == obj->ops->type->type &&
7494                     nft_active_genmask(obj, genmask)) {
7495                         rcu_read_unlock();
7496                         return obj;
7497                 }
7498         }
7499 out:
7500         rcu_read_unlock();
7501         return ERR_PTR(-ENOENT);
7502 }
7503 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7504
7505 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7506                                                   const struct nlattr *nla,
7507                                                   u32 objtype, u8 genmask)
7508 {
7509         struct nft_object *obj;
7510
7511         list_for_each_entry(obj, &table->objects, list) {
7512                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7513                     objtype == obj->ops->type->type &&
7514                     nft_active_genmask(obj, genmask))
7515                         return obj;
7516         }
7517         return ERR_PTR(-ENOENT);
7518 }
7519
7520 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7521         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7522                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7523         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7524                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7525         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7526         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7527         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7528         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7529                                     .len = NFT_USERDATA_MAXLEN },
7530 };
7531
7532 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7533                                        const struct nft_object_type *type,
7534                                        const struct nlattr *attr)
7535 {
7536         struct nlattr **tb;
7537         const struct nft_object_ops *ops;
7538         struct nft_object *obj;
7539         int err = -ENOMEM;
7540
7541         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7542         if (!tb)
7543                 goto err1;
7544
7545         if (attr) {
7546                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7547                                                   type->policy, NULL);
7548                 if (err < 0)
7549                         goto err2;
7550         } else {
7551                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7552         }
7553
7554         if (type->select_ops) {
7555                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7556                 if (IS_ERR(ops)) {
7557                         err = PTR_ERR(ops);
7558                         goto err2;
7559                 }
7560         } else {
7561                 ops = type->ops;
7562         }
7563
7564         err = -ENOMEM;
7565         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7566         if (!obj)
7567                 goto err2;
7568
7569         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7570         if (err < 0)
7571                 goto err3;
7572
7573         obj->ops = ops;
7574
7575         kfree(tb);
7576         return obj;
7577 err3:
7578         kfree(obj);
7579 err2:
7580         kfree(tb);
7581 err1:
7582         return ERR_PTR(err);
7583 }
7584
7585 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7586                            struct nft_object *obj, bool reset)
7587 {
7588         struct nlattr *nest;
7589
7590         nest = nla_nest_start_noflag(skb, attr);
7591         if (!nest)
7592                 goto nla_put_failure;
7593         if (obj->ops->dump(skb, obj, reset) < 0)
7594                 goto nla_put_failure;
7595         nla_nest_end(skb, nest);
7596         return 0;
7597
7598 nla_put_failure:
7599         return -1;
7600 }
7601
7602 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7603 {
7604         const struct nft_object_type *type;
7605
7606         list_for_each_entry(type, &nf_tables_objects, list) {
7607                 if (type->family != NFPROTO_UNSPEC &&
7608                     type->family != family)
7609                         continue;
7610
7611                 if (objtype == type->type)
7612                         return type;
7613         }
7614         return NULL;
7615 }
7616
7617 static const struct nft_object_type *
7618 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7619 {
7620         const struct nft_object_type *type;
7621
7622         type = __nft_obj_type_get(objtype, family);
7623         if (type != NULL && try_module_get(type->owner))
7624                 return type;
7625
7626         lockdep_nfnl_nft_mutex_not_held();
7627 #ifdef CONFIG_MODULES
7628         if (type == NULL) {
7629                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7630                         return ERR_PTR(-EAGAIN);
7631         }
7632 #endif
7633         return ERR_PTR(-ENOENT);
7634 }
7635
7636 static int nf_tables_updobj(const struct nft_ctx *ctx,
7637                             const struct nft_object_type *type,
7638                             const struct nlattr *attr,
7639                             struct nft_object *obj)
7640 {
7641         struct nft_object *newobj;
7642         struct nft_trans *trans;
7643         int err = -ENOMEM;
7644
7645         if (!try_module_get(type->owner))
7646                 return -ENOENT;
7647
7648         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7649                                 sizeof(struct nft_trans_obj));
7650         if (!trans)
7651                 goto err_trans;
7652
7653         newobj = nft_obj_init(ctx, type, attr);
7654         if (IS_ERR(newobj)) {
7655                 err = PTR_ERR(newobj);
7656                 goto err_free_trans;
7657         }
7658
7659         nft_trans_obj(trans) = obj;
7660         nft_trans_obj_update(trans) = true;
7661         nft_trans_obj_newobj(trans) = newobj;
7662         nft_trans_commit_list_add_tail(ctx->net, trans);
7663
7664         return 0;
7665
7666 err_free_trans:
7667         kfree(trans);
7668 err_trans:
7669         module_put(type->owner);
7670         return err;
7671 }
7672
7673 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7674                             const struct nlattr * const nla[])
7675 {
7676         struct netlink_ext_ack *extack = info->extack;
7677         u8 genmask = nft_genmask_next(info->net);
7678         u8 family = info->nfmsg->nfgen_family;
7679         const struct nft_object_type *type;
7680         struct net *net = info->net;
7681         struct nft_table *table;
7682         struct nft_object *obj;
7683         struct nft_ctx ctx;
7684         u32 objtype;
7685         int err;
7686
7687         if (!nla[NFTA_OBJ_TYPE] ||
7688             !nla[NFTA_OBJ_NAME] ||
7689             !nla[NFTA_OBJ_DATA])
7690                 return -EINVAL;
7691
7692         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7693                                  NETLINK_CB(skb).portid);
7694         if (IS_ERR(table)) {
7695                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7696                 return PTR_ERR(table);
7697         }
7698
7699         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7700         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7701         if (IS_ERR(obj)) {
7702                 err = PTR_ERR(obj);
7703                 if (err != -ENOENT) {
7704                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7705                         return err;
7706                 }
7707         } else {
7708                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7709                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7710                         return -EEXIST;
7711                 }
7712                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7713                         return -EOPNOTSUPP;
7714
7715                 type = __nft_obj_type_get(objtype, family);
7716                 if (WARN_ON_ONCE(!type))
7717                         return -ENOENT;
7718
7719                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7720
7721                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7722         }
7723
7724         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7725
7726         if (!nft_use_inc(&table->use))
7727                 return -EMFILE;
7728
7729         type = nft_obj_type_get(net, objtype, family);
7730         if (IS_ERR(type)) {
7731                 err = PTR_ERR(type);
7732                 goto err_type;
7733         }
7734
7735         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7736         if (IS_ERR(obj)) {
7737                 err = PTR_ERR(obj);
7738                 goto err_init;
7739         }
7740         obj->key.table = table;
7741         obj->handle = nf_tables_alloc_handle(table);
7742
7743         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7744         if (!obj->key.name) {
7745                 err = -ENOMEM;
7746                 goto err_strdup;
7747         }
7748
7749         if (nla[NFTA_OBJ_USERDATA]) {
7750                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7751                 if (obj->udata == NULL)
7752                         goto err_userdata;
7753
7754                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7755         }
7756
7757         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7758         if (err < 0)
7759                 goto err_trans;
7760
7761         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7762                               nft_objname_ht_params);
7763         if (err < 0)
7764                 goto err_obj_ht;
7765
7766         list_add_tail_rcu(&obj->list, &table->objects);
7767
7768         return 0;
7769 err_obj_ht:
7770         /* queued in transaction log */
7771         INIT_LIST_HEAD(&obj->list);
7772         return err;
7773 err_trans:
7774         kfree(obj->udata);
7775 err_userdata:
7776         kfree(obj->key.name);
7777 err_strdup:
7778         if (obj->ops->destroy)
7779                 obj->ops->destroy(&ctx, obj);
7780         kfree(obj);
7781 err_init:
7782         module_put(type->owner);
7783 err_type:
7784         nft_use_dec_restore(&table->use);
7785
7786         return err;
7787 }
7788
7789 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7790                                    u32 portid, u32 seq, int event, u32 flags,
7791                                    int family, const struct nft_table *table,
7792                                    struct nft_object *obj, bool reset)
7793 {
7794         struct nlmsghdr *nlh;
7795
7796         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7797         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7798                            NFNETLINK_V0, nft_base_seq(net));
7799         if (!nlh)
7800                 goto nla_put_failure;
7801
7802         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7803             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7804             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7805                          NFTA_OBJ_PAD))
7806                 goto nla_put_failure;
7807
7808         if (event == NFT_MSG_DELOBJ) {
7809                 nlmsg_end(skb, nlh);
7810                 return 0;
7811         }
7812
7813         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7814             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7815             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7816                 goto nla_put_failure;
7817
7818         if (obj->udata &&
7819             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7820                 goto nla_put_failure;
7821
7822         nlmsg_end(skb, nlh);
7823         return 0;
7824
7825 nla_put_failure:
7826         nlmsg_trim(skb, nlh);
7827         return -1;
7828 }
7829
7830 static void audit_log_obj_reset(const struct nft_table *table,
7831                                 unsigned int base_seq, unsigned int nentries)
7832 {
7833         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7834
7835         audit_log_nfcfg(buf, table->family, nentries,
7836                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7837         kfree(buf);
7838 }
7839
7840 struct nft_obj_dump_ctx {
7841         unsigned int    s_idx;
7842         char            *table;
7843         u32             type;
7844         bool            reset;
7845 };
7846
7847 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7848 {
7849         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7850         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7851         struct net *net = sock_net(skb->sk);
7852         int family = nfmsg->nfgen_family;
7853         struct nftables_pernet *nft_net;
7854         const struct nft_table *table;
7855         unsigned int entries = 0;
7856         struct nft_object *obj;
7857         unsigned int idx = 0;
7858         int rc = 0;
7859
7860         rcu_read_lock();
7861         nft_net = nft_pernet(net);
7862         cb->seq = READ_ONCE(nft_net->base_seq);
7863
7864         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7865                 if (family != NFPROTO_UNSPEC && family != table->family)
7866                         continue;
7867
7868                 entries = 0;
7869                 list_for_each_entry_rcu(obj, &table->objects, list) {
7870                         if (!nft_is_active(net, obj))
7871                                 goto cont;
7872                         if (idx < ctx->s_idx)
7873                                 goto cont;
7874                         if (ctx->table && strcmp(ctx->table, table->name))
7875                                 goto cont;
7876                         if (ctx->type != NFT_OBJECT_UNSPEC &&
7877                             obj->ops->type->type != ctx->type)
7878                                 goto cont;
7879
7880                         rc = nf_tables_fill_obj_info(skb, net,
7881                                                      NETLINK_CB(cb->skb).portid,
7882                                                      cb->nlh->nlmsg_seq,
7883                                                      NFT_MSG_NEWOBJ,
7884                                                      NLM_F_MULTI | NLM_F_APPEND,
7885                                                      table->family, table,
7886                                                      obj, ctx->reset);
7887                         if (rc < 0)
7888                                 break;
7889
7890                         entries++;
7891                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7892 cont:
7893                         idx++;
7894                 }
7895                 if (ctx->reset && entries)
7896                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7897                 if (rc < 0)
7898                         break;
7899         }
7900         rcu_read_unlock();
7901
7902         ctx->s_idx = idx;
7903         return skb->len;
7904 }
7905
7906 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7907 {
7908         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7909         const struct nlattr * const *nla = cb->data;
7910
7911         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7912
7913         if (nla[NFTA_OBJ_TABLE]) {
7914                 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7915                 if (!ctx->table)
7916                         return -ENOMEM;
7917         }
7918
7919         if (nla[NFTA_OBJ_TYPE])
7920                 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7921
7922         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7923                 ctx->reset = true;
7924
7925         return 0;
7926 }
7927
7928 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7929 {
7930         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7931
7932         kfree(ctx->table);
7933
7934         return 0;
7935 }
7936
7937 /* called with rcu_read_lock held */
7938 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7939                             const struct nlattr * const nla[])
7940 {
7941         struct netlink_ext_ack *extack = info->extack;
7942         u8 genmask = nft_genmask_cur(info->net);
7943         u8 family = info->nfmsg->nfgen_family;
7944         const struct nft_table *table;
7945         struct net *net = info->net;
7946         struct nft_object *obj;
7947         struct sk_buff *skb2;
7948         bool reset = false;
7949         u32 objtype;
7950         int err;
7951
7952         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7953                 struct netlink_dump_control c = {
7954                         .start = nf_tables_dump_obj_start,
7955                         .dump = nf_tables_dump_obj,
7956                         .done = nf_tables_dump_obj_done,
7957                         .module = THIS_MODULE,
7958                         .data = (void *)nla,
7959                 };
7960
7961                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7962         }
7963
7964         if (!nla[NFTA_OBJ_NAME] ||
7965             !nla[NFTA_OBJ_TYPE])
7966                 return -EINVAL;
7967
7968         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7969         if (IS_ERR(table)) {
7970                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7971                 return PTR_ERR(table);
7972         }
7973
7974         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7975         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7976         if (IS_ERR(obj)) {
7977                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7978                 return PTR_ERR(obj);
7979         }
7980
7981         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7982         if (!skb2)
7983                 return -ENOMEM;
7984
7985         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7986                 reset = true;
7987
7988         if (reset) {
7989                 const struct nftables_pernet *nft_net;
7990                 char *buf;
7991
7992                 nft_net = nft_pernet(net);
7993                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7994
7995                 audit_log_nfcfg(buf,
7996                                 family,
7997                                 1,
7998                                 AUDIT_NFT_OP_OBJ_RESET,
7999                                 GFP_ATOMIC);
8000                 kfree(buf);
8001         }
8002
8003         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
8004                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
8005                                       family, table, obj, reset);
8006         if (err < 0)
8007                 goto err_fill_obj_info;
8008
8009         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8010
8011 err_fill_obj_info:
8012         kfree_skb(skb2);
8013         return err;
8014 }
8015
8016 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
8017 {
8018         if (obj->ops->destroy)
8019                 obj->ops->destroy(ctx, obj);
8020
8021         module_put(obj->ops->type->owner);
8022         kfree(obj->key.name);
8023         kfree(obj->udata);
8024         kfree(obj);
8025 }
8026
8027 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
8028                             const struct nlattr * const nla[])
8029 {
8030         struct netlink_ext_ack *extack = info->extack;
8031         u8 genmask = nft_genmask_next(info->net);
8032         u8 family = info->nfmsg->nfgen_family;
8033         struct net *net = info->net;
8034         const struct nlattr *attr;
8035         struct nft_table *table;
8036         struct nft_object *obj;
8037         struct nft_ctx ctx;
8038         u32 objtype;
8039
8040         if (!nla[NFTA_OBJ_TYPE] ||
8041             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
8042                 return -EINVAL;
8043
8044         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
8045                                  NETLINK_CB(skb).portid);
8046         if (IS_ERR(table)) {
8047                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8048                 return PTR_ERR(table);
8049         }
8050
8051         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8052         if (nla[NFTA_OBJ_HANDLE]) {
8053                 attr = nla[NFTA_OBJ_HANDLE];
8054                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
8055         } else {
8056                 attr = nla[NFTA_OBJ_NAME];
8057                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8058         }
8059
8060         if (IS_ERR(obj)) {
8061                 if (PTR_ERR(obj) == -ENOENT &&
8062                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8063                         return 0;
8064
8065                 NL_SET_BAD_ATTR(extack, attr);
8066                 return PTR_ERR(obj);
8067         }
8068         if (obj->use > 0) {
8069                 NL_SET_BAD_ATTR(extack, attr);
8070                 return -EBUSY;
8071         }
8072
8073         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8074
8075         return nft_delobj(&ctx, obj);
8076 }
8077
8078 static void
8079 __nft_obj_notify(struct net *net, const struct nft_table *table,
8080                  struct nft_object *obj, u32 portid, u32 seq, int event,
8081                  u16 flags, int family, int report, gfp_t gfp)
8082 {
8083         struct nftables_pernet *nft_net = nft_pernet(net);
8084         struct sk_buff *skb;
8085         int err;
8086
8087         if (!report &&
8088             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8089                 return;
8090
8091         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8092         if (skb == NULL)
8093                 goto err;
8094
8095         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8096                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
8097                                       family, table, obj, false);
8098         if (err < 0) {
8099                 kfree_skb(skb);
8100                 goto err;
8101         }
8102
8103         nft_notify_enqueue(skb, report, &nft_net->notify_list);
8104         return;
8105 err:
8106         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8107 }
8108
8109 void nft_obj_notify(struct net *net, const struct nft_table *table,
8110                     struct nft_object *obj, u32 portid, u32 seq, int event,
8111                     u16 flags, int family, int report, gfp_t gfp)
8112 {
8113         struct nftables_pernet *nft_net = nft_pernet(net);
8114         char *buf = kasprintf(gfp, "%s:%u",
8115                               table->name, nft_net->base_seq);
8116
8117         audit_log_nfcfg(buf,
8118                         family,
8119                         obj->handle,
8120                         event == NFT_MSG_NEWOBJ ?
8121                                  AUDIT_NFT_OP_OBJ_REGISTER :
8122                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
8123                         gfp);
8124         kfree(buf);
8125
8126         __nft_obj_notify(net, table, obj, portid, seq, event,
8127                          flags, family, report, gfp);
8128 }
8129 EXPORT_SYMBOL_GPL(nft_obj_notify);
8130
8131 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8132                                  struct nft_object *obj, int event)
8133 {
8134         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8135                          ctx->seq, event, ctx->flags, ctx->family,
8136                          ctx->report, GFP_KERNEL);
8137 }
8138
8139 /*
8140  * Flow tables
8141  */
8142 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8143 {
8144         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8145         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8146         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8147 }
8148 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8149
8150 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8151 {
8152         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8153         list_del_rcu(&type->list);
8154         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8155 }
8156 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8157
8158 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8159         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
8160                                             .len = NFT_NAME_MAXLEN - 1 },
8161         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
8162                                             .len = NFT_NAME_MAXLEN - 1 },
8163         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
8164         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
8165         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
8166 };
8167
8168 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8169                                            const struct nlattr *nla, u8 genmask)
8170 {
8171         struct nft_flowtable *flowtable;
8172
8173         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8174                 if (!nla_strcmp(nla, flowtable->name) &&
8175                     nft_active_genmask(flowtable, genmask))
8176                         return flowtable;
8177         }
8178         return ERR_PTR(-ENOENT);
8179 }
8180 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8181
8182 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8183                                     struct nft_flowtable *flowtable,
8184                                     enum nft_trans_phase phase)
8185 {
8186         switch (phase) {
8187         case NFT_TRANS_PREPARE_ERROR:
8188         case NFT_TRANS_PREPARE:
8189         case NFT_TRANS_ABORT:
8190         case NFT_TRANS_RELEASE:
8191                 nft_use_dec(&flowtable->use);
8192                 fallthrough;
8193         default:
8194                 return;
8195         }
8196 }
8197 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8198
8199 static struct nft_flowtable *
8200 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8201                               const struct nlattr *nla, u8 genmask)
8202 {
8203        struct nft_flowtable *flowtable;
8204
8205        list_for_each_entry(flowtable, &table->flowtables, list) {
8206                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8207                    nft_active_genmask(flowtable, genmask))
8208                        return flowtable;
8209        }
8210        return ERR_PTR(-ENOENT);
8211 }
8212
8213 struct nft_flowtable_hook {
8214         u32                     num;
8215         int                     priority;
8216         struct list_head        list;
8217 };
8218
8219 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8220         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8221         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8222         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8223 };
8224
8225 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8226                                     const struct nlattr * const nla[],
8227                                     struct nft_flowtable_hook *flowtable_hook,
8228                                     struct nft_flowtable *flowtable,
8229                                     struct netlink_ext_ack *extack, bool add)
8230 {
8231         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8232         struct nft_hook *hook;
8233         int hooknum, priority;
8234         int err;
8235
8236         INIT_LIST_HEAD(&flowtable_hook->list);
8237
8238         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8239                                           nla[NFTA_FLOWTABLE_HOOK],
8240                                           nft_flowtable_hook_policy, NULL);
8241         if (err < 0)
8242                 return err;
8243
8244         if (add) {
8245                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8246                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8247                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8248                         return -ENOENT;
8249                 }
8250
8251                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8252                 if (hooknum != NF_NETDEV_INGRESS)
8253                         return -EOPNOTSUPP;
8254
8255                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8256
8257                 flowtable_hook->priority        = priority;
8258                 flowtable_hook->num             = hooknum;
8259         } else {
8260                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8261                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8262                         if (hooknum != flowtable->hooknum)
8263                                 return -EOPNOTSUPP;
8264                 }
8265
8266                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8267                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8268                         if (priority != flowtable->data.priority)
8269                                 return -EOPNOTSUPP;
8270                 }
8271
8272                 flowtable_hook->priority        = flowtable->data.priority;
8273                 flowtable_hook->num             = flowtable->hooknum;
8274         }
8275
8276         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8277                 err = nf_tables_parse_netdev_hooks(ctx->net,
8278                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8279                                                    &flowtable_hook->list,
8280                                                    extack);
8281                 if (err < 0)
8282                         return err;
8283         }
8284
8285         list_for_each_entry(hook, &flowtable_hook->list, list) {
8286                 hook->ops.pf            = NFPROTO_NETDEV;
8287                 hook->ops.hooknum       = flowtable_hook->num;
8288                 hook->ops.priority      = flowtable_hook->priority;
8289                 hook->ops.priv          = &flowtable->data;
8290                 hook->ops.hook          = flowtable->data.type->hook;
8291         }
8292
8293         return err;
8294 }
8295
8296 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8297 {
8298         const struct nf_flowtable_type *type;
8299
8300         list_for_each_entry(type, &nf_tables_flowtables, list) {
8301                 if (family == type->family)
8302                         return type;
8303         }
8304         return NULL;
8305 }
8306
8307 static const struct nf_flowtable_type *
8308 nft_flowtable_type_get(struct net *net, u8 family)
8309 {
8310         const struct nf_flowtable_type *type;
8311
8312         type = __nft_flowtable_type_get(family);
8313         if (type != NULL && try_module_get(type->owner))
8314                 return type;
8315
8316         lockdep_nfnl_nft_mutex_not_held();
8317 #ifdef CONFIG_MODULES
8318         if (type == NULL) {
8319                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8320                         return ERR_PTR(-EAGAIN);
8321         }
8322 #endif
8323         return ERR_PTR(-ENOENT);
8324 }
8325
8326 /* Only called from error and netdev event paths. */
8327 static void nft_unregister_flowtable_hook(struct net *net,
8328                                           struct nft_flowtable *flowtable,
8329                                           struct nft_hook *hook)
8330 {
8331         nf_unregister_net_hook(net, &hook->ops);
8332         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8333                                     FLOW_BLOCK_UNBIND);
8334 }
8335
8336 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8337                                                  struct list_head *hook_list,
8338                                                  bool release_netdev)
8339 {
8340         struct nft_hook *hook, *next;
8341
8342         list_for_each_entry_safe(hook, next, hook_list, list) {
8343                 nf_unregister_net_hook(net, &hook->ops);
8344                 if (release_netdev) {
8345                         list_del(&hook->list);
8346                         kfree_rcu(hook, rcu);
8347                 }
8348         }
8349 }
8350
8351 static void nft_unregister_flowtable_net_hooks(struct net *net,
8352                                                struct list_head *hook_list)
8353 {
8354         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8355 }
8356
8357 static int nft_register_flowtable_net_hooks(struct net *net,
8358                                             struct nft_table *table,
8359                                             struct list_head *hook_list,
8360                                             struct nft_flowtable *flowtable)
8361 {
8362         struct nft_hook *hook, *hook2, *next;
8363         struct nft_flowtable *ft;
8364         int err, i = 0;
8365
8366         list_for_each_entry(hook, hook_list, list) {
8367                 list_for_each_entry(ft, &table->flowtables, list) {
8368                         if (!nft_is_active_next(net, ft))
8369                                 continue;
8370
8371                         list_for_each_entry(hook2, &ft->hook_list, list) {
8372                                 if (hook->ops.dev == hook2->ops.dev &&
8373                                     hook->ops.pf == hook2->ops.pf) {
8374                                         err = -EEXIST;
8375                                         goto err_unregister_net_hooks;
8376                                 }
8377                         }
8378                 }
8379
8380                 err = flowtable->data.type->setup(&flowtable->data,
8381                                                   hook->ops.dev,
8382                                                   FLOW_BLOCK_BIND);
8383                 if (err < 0)
8384                         goto err_unregister_net_hooks;
8385
8386                 err = nf_register_net_hook(net, &hook->ops);
8387                 if (err < 0) {
8388                         flowtable->data.type->setup(&flowtable->data,
8389                                                     hook->ops.dev,
8390                                                     FLOW_BLOCK_UNBIND);
8391                         goto err_unregister_net_hooks;
8392                 }
8393
8394                 i++;
8395         }
8396
8397         return 0;
8398
8399 err_unregister_net_hooks:
8400         list_for_each_entry_safe(hook, next, hook_list, list) {
8401                 if (i-- <= 0)
8402                         break;
8403
8404                 nft_unregister_flowtable_hook(net, flowtable, hook);
8405                 list_del_rcu(&hook->list);
8406                 kfree_rcu(hook, rcu);
8407         }
8408
8409         return err;
8410 }
8411
8412 static void nft_hooks_destroy(struct list_head *hook_list)
8413 {
8414         struct nft_hook *hook, *next;
8415
8416         list_for_each_entry_safe(hook, next, hook_list, list) {
8417                 list_del_rcu(&hook->list);
8418                 kfree_rcu(hook, rcu);
8419         }
8420 }
8421
8422 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8423                                 struct nft_flowtable *flowtable,
8424                                 struct netlink_ext_ack *extack)
8425 {
8426         const struct nlattr * const *nla = ctx->nla;
8427         struct nft_flowtable_hook flowtable_hook;
8428         struct nft_hook *hook, *next;
8429         struct nft_trans *trans;
8430         bool unregister = false;
8431         u32 flags;
8432         int err;
8433
8434         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8435                                        extack, false);
8436         if (err < 0)
8437                 return err;
8438
8439         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8440                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8441                         list_del(&hook->list);
8442                         kfree(hook);
8443                 }
8444         }
8445
8446         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8447                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8448                 if (flags & ~NFT_FLOWTABLE_MASK) {
8449                         err = -EOPNOTSUPP;
8450                         goto err_flowtable_update_hook;
8451                 }
8452                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8453                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8454                         err = -EOPNOTSUPP;
8455                         goto err_flowtable_update_hook;
8456                 }
8457         } else {
8458                 flags = flowtable->data.flags;
8459         }
8460
8461         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8462                                                &flowtable_hook.list, flowtable);
8463         if (err < 0)
8464                 goto err_flowtable_update_hook;
8465
8466         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8467                                 sizeof(struct nft_trans_flowtable));
8468         if (!trans) {
8469                 unregister = true;
8470                 err = -ENOMEM;
8471                 goto err_flowtable_update_hook;
8472         }
8473
8474         nft_trans_flowtable_flags(trans) = flags;
8475         nft_trans_flowtable(trans) = flowtable;
8476         nft_trans_flowtable_update(trans) = true;
8477         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8478         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8479
8480         nft_trans_commit_list_add_tail(ctx->net, trans);
8481
8482         return 0;
8483
8484 err_flowtable_update_hook:
8485         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8486                 if (unregister)
8487                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8488                 list_del_rcu(&hook->list);
8489                 kfree_rcu(hook, rcu);
8490         }
8491
8492         return err;
8493
8494 }
8495
8496 static int nf_tables_newflowtable(struct sk_buff *skb,
8497                                   const struct nfnl_info *info,
8498                                   const struct nlattr * const nla[])
8499 {
8500         struct netlink_ext_ack *extack = info->extack;
8501         struct nft_flowtable_hook flowtable_hook;
8502         u8 genmask = nft_genmask_next(info->net);
8503         u8 family = info->nfmsg->nfgen_family;
8504         const struct nf_flowtable_type *type;
8505         struct nft_flowtable *flowtable;
8506         struct net *net = info->net;
8507         struct nft_table *table;
8508         struct nft_trans *trans;
8509         struct nft_ctx ctx;
8510         int err;
8511
8512         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8513             !nla[NFTA_FLOWTABLE_NAME] ||
8514             !nla[NFTA_FLOWTABLE_HOOK])
8515                 return -EINVAL;
8516
8517         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8518                                  genmask, NETLINK_CB(skb).portid);
8519         if (IS_ERR(table)) {
8520                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8521                 return PTR_ERR(table);
8522         }
8523
8524         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8525                                          genmask);
8526         if (IS_ERR(flowtable)) {
8527                 err = PTR_ERR(flowtable);
8528                 if (err != -ENOENT) {
8529                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8530                         return err;
8531                 }
8532         } else {
8533                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8534                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8535                         return -EEXIST;
8536                 }
8537
8538                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8539
8540                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8541         }
8542
8543         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8544
8545         if (!nft_use_inc(&table->use))
8546                 return -EMFILE;
8547
8548         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8549         if (!flowtable) {
8550                 err = -ENOMEM;
8551                 goto flowtable_alloc;
8552         }
8553
8554         flowtable->table = table;
8555         flowtable->handle = nf_tables_alloc_handle(table);
8556         INIT_LIST_HEAD(&flowtable->hook_list);
8557
8558         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8559         if (!flowtable->name) {
8560                 err = -ENOMEM;
8561                 goto err1;
8562         }
8563
8564         type = nft_flowtable_type_get(net, family);
8565         if (IS_ERR(type)) {
8566                 err = PTR_ERR(type);
8567                 goto err2;
8568         }
8569
8570         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8571                 flowtable->data.flags =
8572                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8573                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8574                         err = -EOPNOTSUPP;
8575                         goto err3;
8576                 }
8577         }
8578
8579         write_pnet(&flowtable->data.net, net);
8580         flowtable->data.type = type;
8581         err = type->init(&flowtable->data);
8582         if (err < 0)
8583                 goto err3;
8584
8585         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8586                                        extack, true);
8587         if (err < 0)
8588                 goto err_flowtable_parse_hooks;
8589
8590         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8591         flowtable->data.priority = flowtable_hook.priority;
8592         flowtable->hooknum = flowtable_hook.num;
8593
8594         trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8595         if (IS_ERR(trans)) {
8596                 err = PTR_ERR(trans);
8597                 goto err_flowtable_trans;
8598         }
8599
8600         /* This must be LAST to ensure no packets are walking over this flowtable. */
8601         err = nft_register_flowtable_net_hooks(ctx.net, table,
8602                                                &flowtable->hook_list,
8603                                                flowtable);
8604         if (err < 0)
8605                 goto err_flowtable_hooks;
8606
8607         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8608
8609         return 0;
8610
8611 err_flowtable_hooks:
8612         nft_trans_destroy(trans);
8613 err_flowtable_trans:
8614         nft_hooks_destroy(&flowtable->hook_list);
8615 err_flowtable_parse_hooks:
8616         flowtable->data.type->free(&flowtable->data);
8617 err3:
8618         module_put(type->owner);
8619 err2:
8620         kfree(flowtable->name);
8621 err1:
8622         kfree(flowtable);
8623 flowtable_alloc:
8624         nft_use_dec_restore(&table->use);
8625
8626         return err;
8627 }
8628
8629 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8630 {
8631         struct nft_hook *this, *next;
8632
8633         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8634                 list_del(&this->list);
8635                 kfree(this);
8636         }
8637 }
8638
8639 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8640                                  struct nft_flowtable *flowtable,
8641                                  struct netlink_ext_ack *extack)
8642 {
8643         const struct nlattr * const *nla = ctx->nla;
8644         struct nft_flowtable_hook flowtable_hook;
8645         LIST_HEAD(flowtable_del_list);
8646         struct nft_hook *this, *hook;
8647         struct nft_trans *trans;
8648         int err;
8649
8650         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8651                                        extack, false);
8652         if (err < 0)
8653                 return err;
8654
8655         list_for_each_entry(this, &flowtable_hook.list, list) {
8656                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8657                 if (!hook) {
8658                         err = -ENOENT;
8659                         goto err_flowtable_del_hook;
8660                 }
8661                 list_move(&hook->list, &flowtable_del_list);
8662         }
8663
8664         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8665                                 sizeof(struct nft_trans_flowtable));
8666         if (!trans) {
8667                 err = -ENOMEM;
8668                 goto err_flowtable_del_hook;
8669         }
8670
8671         nft_trans_flowtable(trans) = flowtable;
8672         nft_trans_flowtable_update(trans) = true;
8673         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8674         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8675         nft_flowtable_hook_release(&flowtable_hook);
8676
8677         nft_trans_commit_list_add_tail(ctx->net, trans);
8678
8679         return 0;
8680
8681 err_flowtable_del_hook:
8682         list_splice(&flowtable_del_list, &flowtable->hook_list);
8683         nft_flowtable_hook_release(&flowtable_hook);
8684
8685         return err;
8686 }
8687
8688 static int nf_tables_delflowtable(struct sk_buff *skb,
8689                                   const struct nfnl_info *info,
8690                                   const struct nlattr * const nla[])
8691 {
8692         struct netlink_ext_ack *extack = info->extack;
8693         u8 genmask = nft_genmask_next(info->net);
8694         u8 family = info->nfmsg->nfgen_family;
8695         struct nft_flowtable *flowtable;
8696         struct net *net = info->net;
8697         const struct nlattr *attr;
8698         struct nft_table *table;
8699         struct nft_ctx ctx;
8700
8701         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8702             (!nla[NFTA_FLOWTABLE_NAME] &&
8703              !nla[NFTA_FLOWTABLE_HANDLE]))
8704                 return -EINVAL;
8705
8706         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8707                                  genmask, NETLINK_CB(skb).portid);
8708         if (IS_ERR(table)) {
8709                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8710                 return PTR_ERR(table);
8711         }
8712
8713         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8714                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8715                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8716         } else {
8717                 attr = nla[NFTA_FLOWTABLE_NAME];
8718                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8719         }
8720
8721         if (IS_ERR(flowtable)) {
8722                 if (PTR_ERR(flowtable) == -ENOENT &&
8723                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8724                         return 0;
8725
8726                 NL_SET_BAD_ATTR(extack, attr);
8727                 return PTR_ERR(flowtable);
8728         }
8729
8730         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8731
8732         if (nla[NFTA_FLOWTABLE_HOOK])
8733                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8734
8735         if (flowtable->use > 0) {
8736                 NL_SET_BAD_ATTR(extack, attr);
8737                 return -EBUSY;
8738         }
8739
8740         return nft_delflowtable(&ctx, flowtable);
8741 }
8742
8743 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8744                                          u32 portid, u32 seq, int event,
8745                                          u32 flags, int family,
8746                                          struct nft_flowtable *flowtable,
8747                                          struct list_head *hook_list)
8748 {
8749         struct nlattr *nest, *nest_devs;
8750         struct nft_hook *hook;
8751         struct nlmsghdr *nlh;
8752
8753         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8754         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8755                            NFNETLINK_V0, nft_base_seq(net));
8756         if (!nlh)
8757                 goto nla_put_failure;
8758
8759         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8760             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8761             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8762                          NFTA_FLOWTABLE_PAD))
8763                 goto nla_put_failure;
8764
8765         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8766                 nlmsg_end(skb, nlh);
8767                 return 0;
8768         }
8769
8770         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8771             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8772                 goto nla_put_failure;
8773
8774         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8775         if (!nest)
8776                 goto nla_put_failure;
8777         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8778             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8779                 goto nla_put_failure;
8780
8781         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8782         if (!nest_devs)
8783                 goto nla_put_failure;
8784
8785         if (!hook_list)
8786                 hook_list = &flowtable->hook_list;
8787
8788         list_for_each_entry_rcu(hook, hook_list, list) {
8789                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8790                         goto nla_put_failure;
8791         }
8792         nla_nest_end(skb, nest_devs);
8793         nla_nest_end(skb, nest);
8794
8795         nlmsg_end(skb, nlh);
8796         return 0;
8797
8798 nla_put_failure:
8799         nlmsg_trim(skb, nlh);
8800         return -1;
8801 }
8802
8803 struct nft_flowtable_filter {
8804         char            *table;
8805 };
8806
8807 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8808                                     struct netlink_callback *cb)
8809 {
8810         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8811         struct nft_flowtable_filter *filter = cb->data;
8812         unsigned int idx = 0, s_idx = cb->args[0];
8813         struct net *net = sock_net(skb->sk);
8814         int family = nfmsg->nfgen_family;
8815         struct nft_flowtable *flowtable;
8816         struct nftables_pernet *nft_net;
8817         const struct nft_table *table;
8818
8819         rcu_read_lock();
8820         nft_net = nft_pernet(net);
8821         cb->seq = READ_ONCE(nft_net->base_seq);
8822
8823         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8824                 if (family != NFPROTO_UNSPEC && family != table->family)
8825                         continue;
8826
8827                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8828                         if (!nft_is_active(net, flowtable))
8829                                 goto cont;
8830                         if (idx < s_idx)
8831                                 goto cont;
8832                         if (idx > s_idx)
8833                                 memset(&cb->args[1], 0,
8834                                        sizeof(cb->args) - sizeof(cb->args[0]));
8835                         if (filter && filter->table &&
8836                             strcmp(filter->table, table->name))
8837                                 goto cont;
8838
8839                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8840                                                           cb->nlh->nlmsg_seq,
8841                                                           NFT_MSG_NEWFLOWTABLE,
8842                                                           NLM_F_MULTI | NLM_F_APPEND,
8843                                                           table->family,
8844                                                           flowtable, NULL) < 0)
8845                                 goto done;
8846
8847                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8848 cont:
8849                         idx++;
8850                 }
8851         }
8852 done:
8853         rcu_read_unlock();
8854
8855         cb->args[0] = idx;
8856         return skb->len;
8857 }
8858
8859 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8860 {
8861         const struct nlattr * const *nla = cb->data;
8862         struct nft_flowtable_filter *filter = NULL;
8863
8864         if (nla[NFTA_FLOWTABLE_TABLE]) {
8865                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8866                 if (!filter)
8867                         return -ENOMEM;
8868
8869                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8870                                            GFP_ATOMIC);
8871                 if (!filter->table) {
8872                         kfree(filter);
8873                         return -ENOMEM;
8874                 }
8875         }
8876
8877         cb->data = filter;
8878         return 0;
8879 }
8880
8881 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8882 {
8883         struct nft_flowtable_filter *filter = cb->data;
8884
8885         if (!filter)
8886                 return 0;
8887
8888         kfree(filter->table);
8889         kfree(filter);
8890
8891         return 0;
8892 }
8893
8894 /* called with rcu_read_lock held */
8895 static int nf_tables_getflowtable(struct sk_buff *skb,
8896                                   const struct nfnl_info *info,
8897                                   const struct nlattr * const nla[])
8898 {
8899         struct netlink_ext_ack *extack = info->extack;
8900         u8 genmask = nft_genmask_cur(info->net);
8901         u8 family = info->nfmsg->nfgen_family;
8902         struct nft_flowtable *flowtable;
8903         const struct nft_table *table;
8904         struct net *net = info->net;
8905         struct sk_buff *skb2;
8906         int err;
8907
8908         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8909                 struct netlink_dump_control c = {
8910                         .start = nf_tables_dump_flowtable_start,
8911                         .dump = nf_tables_dump_flowtable,
8912                         .done = nf_tables_dump_flowtable_done,
8913                         .module = THIS_MODULE,
8914                         .data = (void *)nla,
8915                 };
8916
8917                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8918         }
8919
8920         if (!nla[NFTA_FLOWTABLE_NAME])
8921                 return -EINVAL;
8922
8923         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8924                                  genmask, 0);
8925         if (IS_ERR(table)) {
8926                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8927                 return PTR_ERR(table);
8928         }
8929
8930         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8931                                          genmask);
8932         if (IS_ERR(flowtable)) {
8933                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8934                 return PTR_ERR(flowtable);
8935         }
8936
8937         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8938         if (!skb2)
8939                 return -ENOMEM;
8940
8941         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8942                                             info->nlh->nlmsg_seq,
8943                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8944                                             flowtable, NULL);
8945         if (err < 0)
8946                 goto err_fill_flowtable_info;
8947
8948         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8949
8950 err_fill_flowtable_info:
8951         kfree_skb(skb2);
8952         return err;
8953 }
8954
8955 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8956                                        struct nft_flowtable *flowtable,
8957                                        struct list_head *hook_list, int event)
8958 {
8959         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8960         struct sk_buff *skb;
8961         u16 flags = 0;
8962         int err;
8963
8964         if (!ctx->report &&
8965             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8966                 return;
8967
8968         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8969         if (skb == NULL)
8970                 goto err;
8971
8972         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8973                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8974
8975         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8976                                             ctx->seq, event, flags,
8977                                             ctx->family, flowtable, hook_list);
8978         if (err < 0) {
8979                 kfree_skb(skb);
8980                 goto err;
8981         }
8982
8983         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8984         return;
8985 err:
8986         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8987 }
8988
8989 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8990 {
8991         struct nft_hook *hook, *next;
8992
8993         flowtable->data.type->free(&flowtable->data);
8994         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8995                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8996                                             FLOW_BLOCK_UNBIND);
8997                 list_del_rcu(&hook->list);
8998                 kfree(hook);
8999         }
9000         kfree(flowtable->name);
9001         module_put(flowtable->data.type->owner);
9002         kfree(flowtable);
9003 }
9004
9005 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
9006                                    u32 portid, u32 seq)
9007 {
9008         struct nftables_pernet *nft_net = nft_pernet(net);
9009         struct nlmsghdr *nlh;
9010         char buf[TASK_COMM_LEN];
9011         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
9012
9013         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
9014                            NFNETLINK_V0, nft_base_seq(net));
9015         if (!nlh)
9016                 goto nla_put_failure;
9017
9018         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
9019             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
9020             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
9021                 goto nla_put_failure;
9022
9023         nlmsg_end(skb, nlh);
9024         return 0;
9025
9026 nla_put_failure:
9027         nlmsg_trim(skb, nlh);
9028         return -EMSGSIZE;
9029 }
9030
9031 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
9032                                 struct nft_flowtable *flowtable)
9033 {
9034         struct nft_hook *hook;
9035
9036         list_for_each_entry(hook, &flowtable->hook_list, list) {
9037                 if (hook->ops.dev != dev)
9038                         continue;
9039
9040                 /* flow_offload_netdev_event() cleans up entries for us. */
9041                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
9042                 list_del_rcu(&hook->list);
9043                 kfree_rcu(hook, rcu);
9044                 break;
9045         }
9046 }
9047
9048 static int nf_tables_flowtable_event(struct notifier_block *this,
9049                                      unsigned long event, void *ptr)
9050 {
9051         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
9052         struct nft_flowtable *flowtable;
9053         struct nftables_pernet *nft_net;
9054         struct nft_table *table;
9055         struct net *net;
9056
9057         if (event != NETDEV_UNREGISTER)
9058                 return 0;
9059
9060         net = dev_net(dev);
9061         nft_net = nft_pernet(net);
9062         mutex_lock(&nft_net->commit_mutex);
9063         list_for_each_entry(table, &nft_net->tables, list) {
9064                 list_for_each_entry(flowtable, &table->flowtables, list) {
9065                         nft_flowtable_event(event, dev, flowtable);
9066                 }
9067         }
9068         mutex_unlock(&nft_net->commit_mutex);
9069
9070         return NOTIFY_DONE;
9071 }
9072
9073 static struct notifier_block nf_tables_flowtable_notifier = {
9074         .notifier_call  = nf_tables_flowtable_event,
9075 };
9076
9077 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9078                                  int event)
9079 {
9080         struct nlmsghdr *nlh = nlmsg_hdr(skb);
9081         struct sk_buff *skb2;
9082         int err;
9083
9084         if (!nlmsg_report(nlh) &&
9085             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9086                 return;
9087
9088         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9089         if (skb2 == NULL)
9090                 goto err;
9091
9092         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9093                                       nlh->nlmsg_seq);
9094         if (err < 0) {
9095                 kfree_skb(skb2);
9096                 goto err;
9097         }
9098
9099         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9100                        nlmsg_report(nlh), GFP_KERNEL);
9101         return;
9102 err:
9103         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9104                           -ENOBUFS);
9105 }
9106
9107 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9108                             const struct nlattr * const nla[])
9109 {
9110         struct sk_buff *skb2;
9111         int err;
9112
9113         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9114         if (skb2 == NULL)
9115                 return -ENOMEM;
9116
9117         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9118                                       info->nlh->nlmsg_seq);
9119         if (err < 0)
9120                 goto err_fill_gen_info;
9121
9122         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9123
9124 err_fill_gen_info:
9125         kfree_skb(skb2);
9126         return err;
9127 }
9128
9129 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9130         [NFT_MSG_NEWTABLE] = {
9131                 .call           = nf_tables_newtable,
9132                 .type           = NFNL_CB_BATCH,
9133                 .attr_count     = NFTA_TABLE_MAX,
9134                 .policy         = nft_table_policy,
9135         },
9136         [NFT_MSG_GETTABLE] = {
9137                 .call           = nf_tables_gettable,
9138                 .type           = NFNL_CB_RCU,
9139                 .attr_count     = NFTA_TABLE_MAX,
9140                 .policy         = nft_table_policy,
9141         },
9142         [NFT_MSG_DELTABLE] = {
9143                 .call           = nf_tables_deltable,
9144                 .type           = NFNL_CB_BATCH,
9145                 .attr_count     = NFTA_TABLE_MAX,
9146                 .policy         = nft_table_policy,
9147         },
9148         [NFT_MSG_DESTROYTABLE] = {
9149                 .call           = nf_tables_deltable,
9150                 .type           = NFNL_CB_BATCH,
9151                 .attr_count     = NFTA_TABLE_MAX,
9152                 .policy         = nft_table_policy,
9153         },
9154         [NFT_MSG_NEWCHAIN] = {
9155                 .call           = nf_tables_newchain,
9156                 .type           = NFNL_CB_BATCH,
9157                 .attr_count     = NFTA_CHAIN_MAX,
9158                 .policy         = nft_chain_policy,
9159         },
9160         [NFT_MSG_GETCHAIN] = {
9161                 .call           = nf_tables_getchain,
9162                 .type           = NFNL_CB_RCU,
9163                 .attr_count     = NFTA_CHAIN_MAX,
9164                 .policy         = nft_chain_policy,
9165         },
9166         [NFT_MSG_DELCHAIN] = {
9167                 .call           = nf_tables_delchain,
9168                 .type           = NFNL_CB_BATCH,
9169                 .attr_count     = NFTA_CHAIN_MAX,
9170                 .policy         = nft_chain_policy,
9171         },
9172         [NFT_MSG_DESTROYCHAIN] = {
9173                 .call           = nf_tables_delchain,
9174                 .type           = NFNL_CB_BATCH,
9175                 .attr_count     = NFTA_CHAIN_MAX,
9176                 .policy         = nft_chain_policy,
9177         },
9178         [NFT_MSG_NEWRULE] = {
9179                 .call           = nf_tables_newrule,
9180                 .type           = NFNL_CB_BATCH,
9181                 .attr_count     = NFTA_RULE_MAX,
9182                 .policy         = nft_rule_policy,
9183         },
9184         [NFT_MSG_GETRULE] = {
9185                 .call           = nf_tables_getrule,
9186                 .type           = NFNL_CB_RCU,
9187                 .attr_count     = NFTA_RULE_MAX,
9188                 .policy         = nft_rule_policy,
9189         },
9190         [NFT_MSG_GETRULE_RESET] = {
9191                 .call           = nf_tables_getrule_reset,
9192                 .type           = NFNL_CB_RCU,
9193                 .attr_count     = NFTA_RULE_MAX,
9194                 .policy         = nft_rule_policy,
9195         },
9196         [NFT_MSG_DELRULE] = {
9197                 .call           = nf_tables_delrule,
9198                 .type           = NFNL_CB_BATCH,
9199                 .attr_count     = NFTA_RULE_MAX,
9200                 .policy         = nft_rule_policy,
9201         },
9202         [NFT_MSG_DESTROYRULE] = {
9203                 .call           = nf_tables_delrule,
9204                 .type           = NFNL_CB_BATCH,
9205                 .attr_count     = NFTA_RULE_MAX,
9206                 .policy         = nft_rule_policy,
9207         },
9208         [NFT_MSG_NEWSET] = {
9209                 .call           = nf_tables_newset,
9210                 .type           = NFNL_CB_BATCH,
9211                 .attr_count     = NFTA_SET_MAX,
9212                 .policy         = nft_set_policy,
9213         },
9214         [NFT_MSG_GETSET] = {
9215                 .call           = nf_tables_getset,
9216                 .type           = NFNL_CB_RCU,
9217                 .attr_count     = NFTA_SET_MAX,
9218                 .policy         = nft_set_policy,
9219         },
9220         [NFT_MSG_DELSET] = {
9221                 .call           = nf_tables_delset,
9222                 .type           = NFNL_CB_BATCH,
9223                 .attr_count     = NFTA_SET_MAX,
9224                 .policy         = nft_set_policy,
9225         },
9226         [NFT_MSG_DESTROYSET] = {
9227                 .call           = nf_tables_delset,
9228                 .type           = NFNL_CB_BATCH,
9229                 .attr_count     = NFTA_SET_MAX,
9230                 .policy         = nft_set_policy,
9231         },
9232         [NFT_MSG_NEWSETELEM] = {
9233                 .call           = nf_tables_newsetelem,
9234                 .type           = NFNL_CB_BATCH,
9235                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9236                 .policy         = nft_set_elem_list_policy,
9237         },
9238         [NFT_MSG_GETSETELEM] = {
9239                 .call           = nf_tables_getsetelem,
9240                 .type           = NFNL_CB_RCU,
9241                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9242                 .policy         = nft_set_elem_list_policy,
9243         },
9244         [NFT_MSG_GETSETELEM_RESET] = {
9245                 .call           = nf_tables_getsetelem_reset,
9246                 .type           = NFNL_CB_RCU,
9247                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9248                 .policy         = nft_set_elem_list_policy,
9249         },
9250         [NFT_MSG_DELSETELEM] = {
9251                 .call           = nf_tables_delsetelem,
9252                 .type           = NFNL_CB_BATCH,
9253                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9254                 .policy         = nft_set_elem_list_policy,
9255         },
9256         [NFT_MSG_DESTROYSETELEM] = {
9257                 .call           = nf_tables_delsetelem,
9258                 .type           = NFNL_CB_BATCH,
9259                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9260                 .policy         = nft_set_elem_list_policy,
9261         },
9262         [NFT_MSG_GETGEN] = {
9263                 .call           = nf_tables_getgen,
9264                 .type           = NFNL_CB_RCU,
9265         },
9266         [NFT_MSG_NEWOBJ] = {
9267                 .call           = nf_tables_newobj,
9268                 .type           = NFNL_CB_BATCH,
9269                 .attr_count     = NFTA_OBJ_MAX,
9270                 .policy         = nft_obj_policy,
9271         },
9272         [NFT_MSG_GETOBJ] = {
9273                 .call           = nf_tables_getobj,
9274                 .type           = NFNL_CB_RCU,
9275                 .attr_count     = NFTA_OBJ_MAX,
9276                 .policy         = nft_obj_policy,
9277         },
9278         [NFT_MSG_DELOBJ] = {
9279                 .call           = nf_tables_delobj,
9280                 .type           = NFNL_CB_BATCH,
9281                 .attr_count     = NFTA_OBJ_MAX,
9282                 .policy         = nft_obj_policy,
9283         },
9284         [NFT_MSG_DESTROYOBJ] = {
9285                 .call           = nf_tables_delobj,
9286                 .type           = NFNL_CB_BATCH,
9287                 .attr_count     = NFTA_OBJ_MAX,
9288                 .policy         = nft_obj_policy,
9289         },
9290         [NFT_MSG_GETOBJ_RESET] = {
9291                 .call           = nf_tables_getobj,
9292                 .type           = NFNL_CB_RCU,
9293                 .attr_count     = NFTA_OBJ_MAX,
9294                 .policy         = nft_obj_policy,
9295         },
9296         [NFT_MSG_NEWFLOWTABLE] = {
9297                 .call           = nf_tables_newflowtable,
9298                 .type           = NFNL_CB_BATCH,
9299                 .attr_count     = NFTA_FLOWTABLE_MAX,
9300                 .policy         = nft_flowtable_policy,
9301         },
9302         [NFT_MSG_GETFLOWTABLE] = {
9303                 .call           = nf_tables_getflowtable,
9304                 .type           = NFNL_CB_RCU,
9305                 .attr_count     = NFTA_FLOWTABLE_MAX,
9306                 .policy         = nft_flowtable_policy,
9307         },
9308         [NFT_MSG_DELFLOWTABLE] = {
9309                 .call           = nf_tables_delflowtable,
9310                 .type           = NFNL_CB_BATCH,
9311                 .attr_count     = NFTA_FLOWTABLE_MAX,
9312                 .policy         = nft_flowtable_policy,
9313         },
9314         [NFT_MSG_DESTROYFLOWTABLE] = {
9315                 .call           = nf_tables_delflowtable,
9316                 .type           = NFNL_CB_BATCH,
9317                 .attr_count     = NFTA_FLOWTABLE_MAX,
9318                 .policy         = nft_flowtable_policy,
9319         },
9320 };
9321
9322 static int nf_tables_validate(struct net *net)
9323 {
9324         struct nftables_pernet *nft_net = nft_pernet(net);
9325         struct nft_table *table;
9326
9327         list_for_each_entry(table, &nft_net->tables, list) {
9328                 switch (table->validate_state) {
9329                 case NFT_VALIDATE_SKIP:
9330                         continue;
9331                 case NFT_VALIDATE_NEED:
9332                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9333                         fallthrough;
9334                 case NFT_VALIDATE_DO:
9335                         if (nft_table_validate(net, table) < 0)
9336                                 return -EAGAIN;
9337
9338                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9339                         break;
9340                 }
9341         }
9342
9343         return 0;
9344 }
9345
9346 /* a drop policy has to be deferred until all rules have been activated,
9347  * otherwise a large ruleset that contains a drop-policy base chain will
9348  * cause all packets to get dropped until the full transaction has been
9349  * processed.
9350  *
9351  * We defer the drop policy until the transaction has been finalized.
9352  */
9353 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9354 {
9355         struct nft_base_chain *basechain;
9356
9357         if (nft_trans_chain_policy(trans) != NF_DROP)
9358                 return;
9359
9360         if (!nft_is_base_chain(trans->ctx.chain))
9361                 return;
9362
9363         basechain = nft_base_chain(trans->ctx.chain);
9364         basechain->policy = NF_DROP;
9365 }
9366
9367 static void nft_chain_commit_update(struct nft_trans *trans)
9368 {
9369         struct nft_base_chain *basechain;
9370
9371         if (nft_trans_chain_name(trans)) {
9372                 rhltable_remove(&trans->ctx.table->chains_ht,
9373                                 &trans->ctx.chain->rhlhead,
9374                                 nft_chain_ht_params);
9375                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9376                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9377                                     trans->ctx.chain->name,
9378                                     &trans->ctx.chain->rhlhead,
9379                                     nft_chain_ht_params);
9380         }
9381
9382         if (!nft_is_base_chain(trans->ctx.chain))
9383                 return;
9384
9385         nft_chain_stats_replace(trans);
9386
9387         basechain = nft_base_chain(trans->ctx.chain);
9388
9389         switch (nft_trans_chain_policy(trans)) {
9390         case NF_DROP:
9391         case NF_ACCEPT:
9392                 basechain->policy = nft_trans_chain_policy(trans);
9393                 break;
9394         }
9395 }
9396
9397 static void nft_obj_commit_update(struct nft_trans *trans)
9398 {
9399         struct nft_object *newobj;
9400         struct nft_object *obj;
9401
9402         obj = nft_trans_obj(trans);
9403         newobj = nft_trans_obj_newobj(trans);
9404
9405         if (obj->ops->update)
9406                 obj->ops->update(obj, newobj);
9407
9408         nft_obj_destroy(&trans->ctx, newobj);
9409 }
9410
9411 static void nft_commit_release(struct nft_trans *trans)
9412 {
9413         switch (trans->msg_type) {
9414         case NFT_MSG_DELTABLE:
9415         case NFT_MSG_DESTROYTABLE:
9416                 nf_tables_table_destroy(&trans->ctx);
9417                 break;
9418         case NFT_MSG_NEWCHAIN:
9419                 free_percpu(nft_trans_chain_stats(trans));
9420                 kfree(nft_trans_chain_name(trans));
9421                 break;
9422         case NFT_MSG_DELCHAIN:
9423         case NFT_MSG_DESTROYCHAIN:
9424                 if (nft_trans_chain_update(trans))
9425                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9426                 else
9427                         nf_tables_chain_destroy(&trans->ctx);
9428                 break;
9429         case NFT_MSG_DELRULE:
9430         case NFT_MSG_DESTROYRULE:
9431                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9432                 break;
9433         case NFT_MSG_DELSET:
9434         case NFT_MSG_DESTROYSET:
9435                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9436                 break;
9437         case NFT_MSG_DELSETELEM:
9438         case NFT_MSG_DESTROYSETELEM:
9439                 nf_tables_set_elem_destroy(&trans->ctx,
9440                                            nft_trans_elem_set(trans),
9441                                            nft_trans_elem_priv(trans));
9442                 break;
9443         case NFT_MSG_DELOBJ:
9444         case NFT_MSG_DESTROYOBJ:
9445                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9446                 break;
9447         case NFT_MSG_DELFLOWTABLE:
9448         case NFT_MSG_DESTROYFLOWTABLE:
9449                 if (nft_trans_flowtable_update(trans))
9450                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9451                 else
9452                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9453                 break;
9454         }
9455
9456         if (trans->put_net)
9457                 put_net(trans->ctx.net);
9458
9459         kfree(trans);
9460 }
9461
9462 static void nf_tables_trans_destroy_work(struct work_struct *w)
9463 {
9464         struct nft_trans *trans, *next;
9465         LIST_HEAD(head);
9466
9467         spin_lock(&nf_tables_destroy_list_lock);
9468         list_splice_init(&nf_tables_destroy_list, &head);
9469         spin_unlock(&nf_tables_destroy_list_lock);
9470
9471         if (list_empty(&head))
9472                 return;
9473
9474         synchronize_rcu();
9475
9476         list_for_each_entry_safe(trans, next, &head, list) {
9477                 nft_trans_list_del(trans);
9478                 nft_commit_release(trans);
9479         }
9480 }
9481
9482 void nf_tables_trans_destroy_flush_work(void)
9483 {
9484         flush_work(&trans_destroy_work);
9485 }
9486 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9487
9488 static bool nft_expr_reduce(struct nft_regs_track *track,
9489                             const struct nft_expr *expr)
9490 {
9491         return false;
9492 }
9493
9494 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9495 {
9496         const struct nft_expr *expr, *last;
9497         struct nft_regs_track track = {};
9498         unsigned int size, data_size;
9499         void *data, *data_boundary;
9500         struct nft_rule_dp *prule;
9501         struct nft_rule *rule;
9502
9503         /* already handled or inactive chain? */
9504         if (chain->blob_next || !nft_is_active_next(net, chain))
9505                 return 0;
9506
9507         data_size = 0;
9508         list_for_each_entry(rule, &chain->rules, list) {
9509                 if (nft_is_active_next(net, rule)) {
9510                         data_size += sizeof(*prule) + rule->dlen;
9511                         if (data_size > INT_MAX)
9512                                 return -ENOMEM;
9513                 }
9514         }
9515
9516         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9517         if (!chain->blob_next)
9518                 return -ENOMEM;
9519
9520         data = (void *)chain->blob_next->data;
9521         data_boundary = data + data_size;
9522         size = 0;
9523
9524         list_for_each_entry(rule, &chain->rules, list) {
9525                 if (!nft_is_active_next(net, rule))
9526                         continue;
9527
9528                 prule = (struct nft_rule_dp *)data;
9529                 data += offsetof(struct nft_rule_dp, data);
9530                 if (WARN_ON_ONCE(data > data_boundary))
9531                         return -ENOMEM;
9532
9533                 size = 0;
9534                 track.last = nft_expr_last(rule);
9535                 nft_rule_for_each_expr(expr, last, rule) {
9536                         track.cur = expr;
9537
9538                         if (nft_expr_reduce(&track, expr)) {
9539                                 expr = track.cur;
9540                                 continue;
9541                         }
9542
9543                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9544                                 return -ENOMEM;
9545
9546                         memcpy(data + size, expr, expr->ops->size);
9547                         size += expr->ops->size;
9548                 }
9549                 if (WARN_ON_ONCE(size >= 1 << 12))
9550                         return -ENOMEM;
9551
9552                 prule->handle = rule->handle;
9553                 prule->dlen = size;
9554                 prule->is_last = 0;
9555
9556                 data += size;
9557                 size = 0;
9558                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9559         }
9560
9561         if (WARN_ON_ONCE(data > data_boundary))
9562                 return -ENOMEM;
9563
9564         prule = (struct nft_rule_dp *)data;
9565         nft_last_rule(chain, prule);
9566
9567         return 0;
9568 }
9569
9570 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9571 {
9572         struct nftables_pernet *nft_net = nft_pernet(net);
9573         struct nft_trans *trans, *next;
9574
9575         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9576                 struct nft_chain *chain = trans->ctx.chain;
9577
9578                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9579                     trans->msg_type == NFT_MSG_DELRULE) {
9580                         kvfree(chain->blob_next);
9581                         chain->blob_next = NULL;
9582                 }
9583         }
9584 }
9585
9586 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9587 {
9588         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9589
9590         kvfree(l->blob);
9591 }
9592
9593 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9594 {
9595         struct nft_rule_dp_last *last;
9596
9597         /* last rule trailer is after end marker */
9598         last = (void *)blob + sizeof(*blob) + blob->size;
9599         last->blob = blob;
9600
9601         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9602 }
9603
9604 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9605 {
9606         struct nft_rule_blob *g0, *g1;
9607         bool next_genbit;
9608
9609         next_genbit = nft_gencursor_next(net);
9610
9611         g0 = rcu_dereference_protected(chain->blob_gen_0,
9612                                        lockdep_commit_lock_is_held(net));
9613         g1 = rcu_dereference_protected(chain->blob_gen_1,
9614                                        lockdep_commit_lock_is_held(net));
9615
9616         /* No changes to this chain? */
9617         if (chain->blob_next == NULL) {
9618                 /* chain had no change in last or next generation */
9619                 if (g0 == g1)
9620                         return;
9621                 /*
9622                  * chain had no change in this generation; make sure next
9623                  * one uses same rules as current generation.
9624                  */
9625                 if (next_genbit) {
9626                         rcu_assign_pointer(chain->blob_gen_1, g0);
9627                         nf_tables_commit_chain_free_rules_old(g1);
9628                 } else {
9629                         rcu_assign_pointer(chain->blob_gen_0, g1);
9630                         nf_tables_commit_chain_free_rules_old(g0);
9631                 }
9632
9633                 return;
9634         }
9635
9636         if (next_genbit)
9637                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9638         else
9639                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9640
9641         chain->blob_next = NULL;
9642
9643         if (g0 == g1)
9644                 return;
9645
9646         if (next_genbit)
9647                 nf_tables_commit_chain_free_rules_old(g1);
9648         else
9649                 nf_tables_commit_chain_free_rules_old(g0);
9650 }
9651
9652 static void nft_obj_del(struct nft_object *obj)
9653 {
9654         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9655         list_del_rcu(&obj->list);
9656 }
9657
9658 void nft_chain_del(struct nft_chain *chain)
9659 {
9660         struct nft_table *table = chain->table;
9661
9662         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9663                                      nft_chain_ht_params));
9664         list_del_rcu(&chain->list);
9665 }
9666
9667 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9668                                         struct nft_trans_gc *trans)
9669 {
9670         struct nft_elem_priv **priv = trans->priv;
9671         unsigned int i;
9672
9673         for (i = 0; i < trans->count; i++) {
9674                 nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
9675                 nft_setelem_remove(ctx->net, trans->set, priv[i]);
9676         }
9677 }
9678
9679 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9680 {
9681         nft_set_put(trans->set);
9682         put_net(trans->net);
9683         kfree(trans);
9684 }
9685
9686 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9687 {
9688         struct nft_elem_priv *elem_priv;
9689         struct nft_trans_gc *trans;
9690         struct nft_ctx ctx = {};
9691         unsigned int i;
9692
9693         trans = container_of(rcu, struct nft_trans_gc, rcu);
9694         ctx.net = read_pnet(&trans->set->net);
9695
9696         for (i = 0; i < trans->count; i++) {
9697                 elem_priv = trans->priv[i];
9698                 if (!nft_setelem_is_catchall(trans->set, elem_priv))
9699                         atomic_dec(&trans->set->nelems);
9700
9701                 nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
9702         }
9703
9704         nft_trans_gc_destroy(trans);
9705 }
9706
9707 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9708 {
9709         struct nftables_pernet *nft_net;
9710         struct nft_ctx ctx = {};
9711
9712         nft_net = nft_pernet(trans->net);
9713
9714         mutex_lock(&nft_net->commit_mutex);
9715
9716         /* Check for race with transaction, otherwise this batch refers to
9717          * stale objects that might not be there anymore. Skip transaction if
9718          * set has been destroyed from control plane transaction in case gc
9719          * worker loses race.
9720          */
9721         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9722                 mutex_unlock(&nft_net->commit_mutex);
9723                 return false;
9724         }
9725
9726         ctx.net = trans->net;
9727         ctx.table = trans->set->table;
9728
9729         nft_trans_gc_setelem_remove(&ctx, trans);
9730         mutex_unlock(&nft_net->commit_mutex);
9731
9732         return true;
9733 }
9734
9735 static void nft_trans_gc_work(struct work_struct *work)
9736 {
9737         struct nft_trans_gc *trans, *next;
9738         LIST_HEAD(trans_gc_list);
9739
9740         spin_lock(&nf_tables_gc_list_lock);
9741         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9742         spin_unlock(&nf_tables_gc_list_lock);
9743
9744         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9745                 list_del(&trans->list);
9746                 if (!nft_trans_gc_work_done(trans)) {
9747                         nft_trans_gc_destroy(trans);
9748                         continue;
9749                 }
9750                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9751         }
9752 }
9753
9754 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9755                                         unsigned int gc_seq, gfp_t gfp)
9756 {
9757         struct net *net = read_pnet(&set->net);
9758         struct nft_trans_gc *trans;
9759
9760         trans = kzalloc(sizeof(*trans), gfp);
9761         if (!trans)
9762                 return NULL;
9763
9764         trans->net = maybe_get_net(net);
9765         if (!trans->net) {
9766                 kfree(trans);
9767                 return NULL;
9768         }
9769
9770         refcount_inc(&set->refs);
9771         trans->set = set;
9772         trans->seq = gc_seq;
9773
9774         return trans;
9775 }
9776
9777 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9778 {
9779         trans->priv[trans->count++] = priv;
9780 }
9781
9782 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9783 {
9784         spin_lock(&nf_tables_gc_list_lock);
9785         list_add_tail(&trans->list, &nf_tables_gc_list);
9786         spin_unlock(&nf_tables_gc_list_lock);
9787
9788         schedule_work(&trans_gc_work);
9789 }
9790
9791 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9792 {
9793         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9794 }
9795
9796 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9797                                               unsigned int gc_seq, gfp_t gfp)
9798 {
9799         struct nft_set *set;
9800
9801         if (nft_trans_gc_space(gc))
9802                 return gc;
9803
9804         set = gc->set;
9805         nft_trans_gc_queue_work(gc);
9806
9807         return nft_trans_gc_alloc(set, gc_seq, gfp);
9808 }
9809
9810 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9811 {
9812         if (trans->count == 0) {
9813                 nft_trans_gc_destroy(trans);
9814                 return;
9815         }
9816
9817         nft_trans_gc_queue_work(trans);
9818 }
9819
9820 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9821 {
9822         struct nft_set *set;
9823
9824         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9825                 return NULL;
9826
9827         if (nft_trans_gc_space(gc))
9828                 return gc;
9829
9830         set = gc->set;
9831         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9832
9833         return nft_trans_gc_alloc(set, 0, gfp);
9834 }
9835
9836 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9837 {
9838         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9839
9840         if (trans->count == 0) {
9841                 nft_trans_gc_destroy(trans);
9842                 return;
9843         }
9844
9845         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9846 }
9847
9848 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9849                                                  unsigned int gc_seq)
9850 {
9851         struct nft_set_elem_catchall *catchall;
9852         const struct nft_set *set = gc->set;
9853         struct nft_set_ext *ext;
9854
9855         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9856                 ext = nft_set_elem_ext(set, catchall->elem);
9857
9858                 if (!nft_set_elem_expired(ext))
9859                         continue;
9860                 if (nft_set_elem_is_dead(ext))
9861                         goto dead_elem;
9862
9863                 nft_set_elem_dead(ext);
9864 dead_elem:
9865                 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9866                 if (!gc)
9867                         return NULL;
9868
9869                 nft_trans_gc_elem_add(gc, catchall->elem);
9870         }
9871
9872         return gc;
9873 }
9874
9875 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9876 {
9877         struct nft_set_elem_catchall *catchall, *next;
9878         u64 tstamp = nft_net_tstamp(gc->net);
9879         const struct nft_set *set = gc->set;
9880         struct nft_elem_priv *elem_priv;
9881         struct nft_set_ext *ext;
9882
9883         WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9884
9885         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9886                 ext = nft_set_elem_ext(set, catchall->elem);
9887
9888                 if (!__nft_set_elem_expired(ext, tstamp))
9889                         continue;
9890
9891                 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9892                 if (!gc)
9893                         return NULL;
9894
9895                 elem_priv = catchall->elem;
9896                 nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
9897                 nft_setelem_catchall_destroy(catchall);
9898                 nft_trans_gc_elem_add(gc, elem_priv);
9899         }
9900
9901         return gc;
9902 }
9903
9904 static void nf_tables_module_autoload_cleanup(struct net *net)
9905 {
9906         struct nftables_pernet *nft_net = nft_pernet(net);
9907         struct nft_module_request *req, *next;
9908
9909         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9910         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9911                 WARN_ON_ONCE(!req->done);
9912                 list_del(&req->list);
9913                 kfree(req);
9914         }
9915 }
9916
9917 static void nf_tables_commit_release(struct net *net)
9918 {
9919         struct nftables_pernet *nft_net = nft_pernet(net);
9920         struct nft_trans *trans;
9921
9922         /* all side effects have to be made visible.
9923          * For example, if a chain named 'foo' has been deleted, a
9924          * new transaction must not find it anymore.
9925          *
9926          * Memory reclaim happens asynchronously from work queue
9927          * to prevent expensive synchronize_rcu() in commit phase.
9928          */
9929         if (list_empty(&nft_net->commit_list)) {
9930                 nf_tables_module_autoload_cleanup(net);
9931                 mutex_unlock(&nft_net->commit_mutex);
9932                 return;
9933         }
9934
9935         trans = list_last_entry(&nft_net->commit_list,
9936                                 struct nft_trans, list);
9937         get_net(trans->ctx.net);
9938         WARN_ON_ONCE(trans->put_net);
9939
9940         trans->put_net = true;
9941         spin_lock(&nf_tables_destroy_list_lock);
9942         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9943         spin_unlock(&nf_tables_destroy_list_lock);
9944
9945         nf_tables_module_autoload_cleanup(net);
9946         schedule_work(&trans_destroy_work);
9947
9948         mutex_unlock(&nft_net->commit_mutex);
9949 }
9950
9951 static void nft_commit_notify(struct net *net, u32 portid)
9952 {
9953         struct nftables_pernet *nft_net = nft_pernet(net);
9954         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9955         unsigned char *data;
9956         int len;
9957
9958         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9959                 if (!batch_skb) {
9960 new_batch:
9961                         batch_skb = skb;
9962                         len = NLMSG_GOODSIZE - skb->len;
9963                         list_del(&skb->list);
9964                         continue;
9965                 }
9966                 len -= skb->len;
9967                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9968                         data = skb_put(batch_skb, skb->len);
9969                         memcpy(data, skb->data, skb->len);
9970                         list_del(&skb->list);
9971                         kfree_skb(skb);
9972                         continue;
9973                 }
9974                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9975                                NFT_CB(batch_skb).report, GFP_KERNEL);
9976                 goto new_batch;
9977         }
9978
9979         if (batch_skb) {
9980                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9981                                NFT_CB(batch_skb).report, GFP_KERNEL);
9982         }
9983
9984         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9985 }
9986
9987 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9988                                         struct nft_table *table)
9989 {
9990         struct nft_audit_data *adp;
9991
9992         list_for_each_entry(adp, adl, list) {
9993                 if (adp->table == table)
9994                         return 0;
9995         }
9996         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9997         if (!adp)
9998                 return -ENOMEM;
9999         adp->table = table;
10000         list_add(&adp->list, adl);
10001         return 0;
10002 }
10003
10004 static void nf_tables_commit_audit_free(struct list_head *adl)
10005 {
10006         struct nft_audit_data *adp, *adn;
10007
10008         list_for_each_entry_safe(adp, adn, adl, list) {
10009                 list_del(&adp->list);
10010                 kfree(adp);
10011         }
10012 }
10013
10014 static void nf_tables_commit_audit_collect(struct list_head *adl,
10015                                            struct nft_table *table, u32 op)
10016 {
10017         struct nft_audit_data *adp;
10018
10019         list_for_each_entry(adp, adl, list) {
10020                 if (adp->table == table)
10021                         goto found;
10022         }
10023         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
10024         return;
10025 found:
10026         adp->entries++;
10027         if (!adp->op || adp->op > op)
10028                 adp->op = op;
10029 }
10030
10031 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
10032
10033 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
10034 {
10035         struct nft_audit_data *adp, *adn;
10036         char aubuf[AUNFTABLENAMELEN];
10037
10038         list_for_each_entry_safe(adp, adn, adl, list) {
10039                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
10040                          generation);
10041                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
10042                                 nft2audit_op[adp->op], GFP_KERNEL);
10043                 list_del(&adp->list);
10044                 kfree(adp);
10045         }
10046 }
10047
10048 static void nft_set_commit_update(struct list_head *set_update_list)
10049 {
10050         struct nft_set *set, *next;
10051
10052         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10053                 list_del_init(&set->pending_update);
10054
10055                 if (!set->ops->commit || set->dead)
10056                         continue;
10057
10058                 set->ops->commit(set);
10059         }
10060 }
10061
10062 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10063 {
10064         unsigned int gc_seq;
10065
10066         /* Bump gc counter, it becomes odd, this is the busy mark. */
10067         gc_seq = READ_ONCE(nft_net->gc_seq);
10068         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10069
10070         return gc_seq;
10071 }
10072
10073 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10074 {
10075         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10076 }
10077
10078 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10079 {
10080         struct nftables_pernet *nft_net = nft_pernet(net);
10081         struct nft_trans *trans, *next;
10082         unsigned int base_seq, gc_seq;
10083         LIST_HEAD(set_update_list);
10084         struct nft_trans_elem *te;
10085         struct nft_chain *chain;
10086         struct nft_table *table;
10087         LIST_HEAD(adl);
10088         int err;
10089
10090         if (list_empty(&nft_net->commit_list)) {
10091                 mutex_unlock(&nft_net->commit_mutex);
10092                 return 0;
10093         }
10094
10095         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10096                 switch (trans->msg_type) {
10097                 case NFT_MSG_NEWSET:
10098                         if (!nft_trans_set_update(trans) &&
10099                             nft_set_is_anonymous(nft_trans_set(trans)) &&
10100                             !nft_trans_set_bound(trans)) {
10101                                 pr_warn_once("nftables ruleset with unbound set\n");
10102                                 return -EINVAL;
10103                         }
10104                         break;
10105                 case NFT_MSG_NEWCHAIN:
10106                         if (!nft_trans_chain_update(trans) &&
10107                             nft_chain_binding(nft_trans_chain(trans)) &&
10108                             !nft_trans_chain_bound(trans)) {
10109                                 pr_warn_once("nftables ruleset with unbound chain\n");
10110                                 return -EINVAL;
10111                         }
10112                         break;
10113                 }
10114         }
10115
10116         /* 0. Validate ruleset, otherwise roll back for error reporting. */
10117         if (nf_tables_validate(net) < 0) {
10118                 nft_net->validate_state = NFT_VALIDATE_DO;
10119                 return -EAGAIN;
10120         }
10121
10122         err = nft_flow_rule_offload_commit(net);
10123         if (err < 0)
10124                 return err;
10125
10126         /* 1.  Allocate space for next generation rules_gen_X[] */
10127         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10128                 int ret;
10129
10130                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10131                 if (ret) {
10132                         nf_tables_commit_chain_prepare_cancel(net);
10133                         nf_tables_commit_audit_free(&adl);
10134                         return ret;
10135                 }
10136                 if (trans->msg_type == NFT_MSG_NEWRULE ||
10137                     trans->msg_type == NFT_MSG_DELRULE) {
10138                         chain = trans->ctx.chain;
10139
10140                         ret = nf_tables_commit_chain_prepare(net, chain);
10141                         if (ret < 0) {
10142                                 nf_tables_commit_chain_prepare_cancel(net);
10143                                 nf_tables_commit_audit_free(&adl);
10144                                 return ret;
10145                         }
10146                 }
10147         }
10148
10149         /* step 2.  Make rules_gen_X visible to packet path */
10150         list_for_each_entry(table, &nft_net->tables, list) {
10151                 list_for_each_entry(chain, &table->chains, list)
10152                         nf_tables_commit_chain(net, chain);
10153         }
10154
10155         /*
10156          * Bump generation counter, invalidate any dump in progress.
10157          * Cannot fail after this point.
10158          */
10159         base_seq = READ_ONCE(nft_net->base_seq);
10160         while (++base_seq == 0)
10161                 ;
10162
10163         WRITE_ONCE(nft_net->base_seq, base_seq);
10164
10165         gc_seq = nft_gc_seq_begin(nft_net);
10166
10167         /* step 3. Start new generation, rules_gen_X now in use. */
10168         net->nft.gencursor = nft_gencursor_next(net);
10169
10170         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10171                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10172                                                trans->msg_type);
10173                 switch (trans->msg_type) {
10174                 case NFT_MSG_NEWTABLE:
10175                         if (nft_trans_table_update(trans)) {
10176                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10177                                         nft_trans_destroy(trans);
10178                                         break;
10179                                 }
10180                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10181                                         nf_tables_table_disable(net, trans->ctx.table);
10182
10183                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10184                         } else {
10185                                 nft_clear(net, trans->ctx.table);
10186                         }
10187                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10188                         nft_trans_destroy(trans);
10189                         break;
10190                 case NFT_MSG_DELTABLE:
10191                 case NFT_MSG_DESTROYTABLE:
10192                         list_del_rcu(&trans->ctx.table->list);
10193                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
10194                         break;
10195                 case NFT_MSG_NEWCHAIN:
10196                         if (nft_trans_chain_update(trans)) {
10197                                 nft_chain_commit_update(trans);
10198                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10199                                                        &nft_trans_chain_hooks(trans));
10200                                 list_splice(&nft_trans_chain_hooks(trans),
10201                                             &nft_trans_basechain(trans)->hook_list);
10202                                 /* trans destroyed after rcu grace period */
10203                         } else {
10204                                 nft_chain_commit_drop_policy(trans);
10205                                 nft_clear(net, trans->ctx.chain);
10206                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10207                                 nft_trans_destroy(trans);
10208                         }
10209                         break;
10210                 case NFT_MSG_DELCHAIN:
10211                 case NFT_MSG_DESTROYCHAIN:
10212                         if (nft_trans_chain_update(trans)) {
10213                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10214                                                        &nft_trans_chain_hooks(trans));
10215                                 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10216                                         nft_netdev_unregister_hooks(net,
10217                                                                     &nft_trans_chain_hooks(trans),
10218                                                                     true);
10219                                 }
10220                         } else {
10221                                 nft_chain_del(trans->ctx.chain);
10222                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10223                                                        NULL);
10224                                 nf_tables_unregister_hook(trans->ctx.net,
10225                                                           trans->ctx.table,
10226                                                           trans->ctx.chain);
10227                         }
10228                         break;
10229                 case NFT_MSG_NEWRULE:
10230                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10231                         nf_tables_rule_notify(&trans->ctx,
10232                                               nft_trans_rule(trans),
10233                                               NFT_MSG_NEWRULE);
10234                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10235                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10236
10237                         nft_trans_destroy(trans);
10238                         break;
10239                 case NFT_MSG_DELRULE:
10240                 case NFT_MSG_DESTROYRULE:
10241                         list_del_rcu(&nft_trans_rule(trans)->list);
10242                         nf_tables_rule_notify(&trans->ctx,
10243                                               nft_trans_rule(trans),
10244                                               trans->msg_type);
10245                         nft_rule_expr_deactivate(&trans->ctx,
10246                                                  nft_trans_rule(trans),
10247                                                  NFT_TRANS_COMMIT);
10248
10249                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10250                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10251                         break;
10252                 case NFT_MSG_NEWSET:
10253                         if (nft_trans_set_update(trans)) {
10254                                 struct nft_set *set = nft_trans_set(trans);
10255
10256                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10257                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10258
10259                                 if (nft_trans_set_size(trans))
10260                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10261                         } else {
10262                                 nft_clear(net, nft_trans_set(trans));
10263                                 /* This avoids hitting -EBUSY when deleting the table
10264                                  * from the transaction.
10265                                  */
10266                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10267                                     !list_empty(&nft_trans_set(trans)->bindings))
10268                                         nft_use_dec(&trans->ctx.table->use);
10269                         }
10270                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10271                                              NFT_MSG_NEWSET, GFP_KERNEL);
10272                         nft_trans_destroy(trans);
10273                         break;
10274                 case NFT_MSG_DELSET:
10275                 case NFT_MSG_DESTROYSET:
10276                         nft_trans_set(trans)->dead = 1;
10277                         list_del_rcu(&nft_trans_set(trans)->list);
10278                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10279                                              trans->msg_type, GFP_KERNEL);
10280                         break;
10281                 case NFT_MSG_NEWSETELEM:
10282                         te = (struct nft_trans_elem *)trans->data;
10283
10284                         nft_setelem_activate(net, te->set, te->elem_priv);
10285                         nf_tables_setelem_notify(&trans->ctx, te->set,
10286                                                  te->elem_priv,
10287                                                  NFT_MSG_NEWSETELEM);
10288                         if (te->set->ops->commit &&
10289                             list_empty(&te->set->pending_update)) {
10290                                 list_add_tail(&te->set->pending_update,
10291                                               &set_update_list);
10292                         }
10293                         nft_trans_destroy(trans);
10294                         break;
10295                 case NFT_MSG_DELSETELEM:
10296                 case NFT_MSG_DESTROYSETELEM:
10297                         te = (struct nft_trans_elem *)trans->data;
10298
10299                         nf_tables_setelem_notify(&trans->ctx, te->set,
10300                                                  te->elem_priv,
10301                                                  trans->msg_type);
10302                         nft_setelem_remove(net, te->set, te->elem_priv);
10303                         if (!nft_setelem_is_catchall(te->set, te->elem_priv)) {
10304                                 atomic_dec(&te->set->nelems);
10305                                 te->set->ndeact--;
10306                         }
10307                         if (te->set->ops->commit &&
10308                             list_empty(&te->set->pending_update)) {
10309                                 list_add_tail(&te->set->pending_update,
10310                                               &set_update_list);
10311                         }
10312                         break;
10313                 case NFT_MSG_NEWOBJ:
10314                         if (nft_trans_obj_update(trans)) {
10315                                 nft_obj_commit_update(trans);
10316                                 nf_tables_obj_notify(&trans->ctx,
10317                                                      nft_trans_obj(trans),
10318                                                      NFT_MSG_NEWOBJ);
10319                         } else {
10320                                 nft_clear(net, nft_trans_obj(trans));
10321                                 nf_tables_obj_notify(&trans->ctx,
10322                                                      nft_trans_obj(trans),
10323                                                      NFT_MSG_NEWOBJ);
10324                                 nft_trans_destroy(trans);
10325                         }
10326                         break;
10327                 case NFT_MSG_DELOBJ:
10328                 case NFT_MSG_DESTROYOBJ:
10329                         nft_obj_del(nft_trans_obj(trans));
10330                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10331                                              trans->msg_type);
10332                         break;
10333                 case NFT_MSG_NEWFLOWTABLE:
10334                         if (nft_trans_flowtable_update(trans)) {
10335                                 nft_trans_flowtable(trans)->data.flags =
10336                                         nft_trans_flowtable_flags(trans);
10337                                 nf_tables_flowtable_notify(&trans->ctx,
10338                                                            nft_trans_flowtable(trans),
10339                                                            &nft_trans_flowtable_hooks(trans),
10340                                                            NFT_MSG_NEWFLOWTABLE);
10341                                 list_splice(&nft_trans_flowtable_hooks(trans),
10342                                             &nft_trans_flowtable(trans)->hook_list);
10343                         } else {
10344                                 nft_clear(net, nft_trans_flowtable(trans));
10345                                 nf_tables_flowtable_notify(&trans->ctx,
10346                                                            nft_trans_flowtable(trans),
10347                                                            NULL,
10348                                                            NFT_MSG_NEWFLOWTABLE);
10349                         }
10350                         nft_trans_destroy(trans);
10351                         break;
10352                 case NFT_MSG_DELFLOWTABLE:
10353                 case NFT_MSG_DESTROYFLOWTABLE:
10354                         if (nft_trans_flowtable_update(trans)) {
10355                                 nf_tables_flowtable_notify(&trans->ctx,
10356                                                            nft_trans_flowtable(trans),
10357                                                            &nft_trans_flowtable_hooks(trans),
10358                                                            trans->msg_type);
10359                                 nft_unregister_flowtable_net_hooks(net,
10360                                                                    &nft_trans_flowtable_hooks(trans));
10361                         } else {
10362                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10363                                 nf_tables_flowtable_notify(&trans->ctx,
10364                                                            nft_trans_flowtable(trans),
10365                                                            NULL,
10366                                                            trans->msg_type);
10367                                 nft_unregister_flowtable_net_hooks(net,
10368                                                 &nft_trans_flowtable(trans)->hook_list);
10369                         }
10370                         break;
10371                 }
10372         }
10373
10374         nft_set_commit_update(&set_update_list);
10375
10376         nft_commit_notify(net, NETLINK_CB(skb).portid);
10377         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10378         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10379
10380         nft_gc_seq_end(nft_net, gc_seq);
10381         nft_net->validate_state = NFT_VALIDATE_SKIP;
10382         nf_tables_commit_release(net);
10383
10384         return 0;
10385 }
10386
10387 static void nf_tables_module_autoload(struct net *net)
10388 {
10389         struct nftables_pernet *nft_net = nft_pernet(net);
10390         struct nft_module_request *req, *next;
10391         LIST_HEAD(module_list);
10392
10393         list_splice_init(&nft_net->module_list, &module_list);
10394         mutex_unlock(&nft_net->commit_mutex);
10395         list_for_each_entry_safe(req, next, &module_list, list) {
10396                 request_module("%s", req->module);
10397                 req->done = true;
10398         }
10399         mutex_lock(&nft_net->commit_mutex);
10400         list_splice(&module_list, &nft_net->module_list);
10401 }
10402
10403 static void nf_tables_abort_release(struct nft_trans *trans)
10404 {
10405         switch (trans->msg_type) {
10406         case NFT_MSG_NEWTABLE:
10407                 nf_tables_table_destroy(&trans->ctx);
10408                 break;
10409         case NFT_MSG_NEWCHAIN:
10410                 if (nft_trans_chain_update(trans))
10411                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10412                 else
10413                         nf_tables_chain_destroy(&trans->ctx);
10414                 break;
10415         case NFT_MSG_NEWRULE:
10416                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10417                 break;
10418         case NFT_MSG_NEWSET:
10419                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10420                 break;
10421         case NFT_MSG_NEWSETELEM:
10422                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10423                                      nft_trans_elem_priv(trans), true);
10424                 break;
10425         case NFT_MSG_NEWOBJ:
10426                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10427                 break;
10428         case NFT_MSG_NEWFLOWTABLE:
10429                 if (nft_trans_flowtable_update(trans))
10430                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10431                 else
10432                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10433                 break;
10434         }
10435         kfree(trans);
10436 }
10437
10438 static void nft_set_abort_update(struct list_head *set_update_list)
10439 {
10440         struct nft_set *set, *next;
10441
10442         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10443                 list_del_init(&set->pending_update);
10444
10445                 if (!set->ops->abort)
10446                         continue;
10447
10448                 set->ops->abort(set);
10449         }
10450 }
10451
10452 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10453 {
10454         struct nftables_pernet *nft_net = nft_pernet(net);
10455         struct nft_trans *trans, *next;
10456         LIST_HEAD(set_update_list);
10457         struct nft_trans_elem *te;
10458         int err = 0;
10459
10460         if (action == NFNL_ABORT_VALIDATE &&
10461             nf_tables_validate(net) < 0)
10462                 err = -EAGAIN;
10463
10464         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10465                                          list) {
10466                 switch (trans->msg_type) {
10467                 case NFT_MSG_NEWTABLE:
10468                         if (nft_trans_table_update(trans)) {
10469                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10470                                         nft_trans_destroy(trans);
10471                                         break;
10472                                 }
10473                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10474                                         nf_tables_table_disable(net, trans->ctx.table);
10475                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10476                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10477                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10478                                 }
10479                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_ORPHAN) {
10480                                         trans->ctx.table->flags &= ~NFT_TABLE_F_OWNER;
10481                                         trans->ctx.table->nlpid = 0;
10482                                 }
10483                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10484                                 nft_trans_destroy(trans);
10485                         } else {
10486                                 list_del_rcu(&trans->ctx.table->list);
10487                         }
10488                         break;
10489                 case NFT_MSG_DELTABLE:
10490                 case NFT_MSG_DESTROYTABLE:
10491                         nft_clear(trans->ctx.net, trans->ctx.table);
10492                         nft_trans_destroy(trans);
10493                         break;
10494                 case NFT_MSG_NEWCHAIN:
10495                         if (nft_trans_chain_update(trans)) {
10496                                 if (!(trans->ctx.table->flags & NFT_TABLE_F_DORMANT)) {
10497                                         nft_netdev_unregister_hooks(net,
10498                                                                     &nft_trans_chain_hooks(trans),
10499                                                                     true);
10500                                 }
10501                                 free_percpu(nft_trans_chain_stats(trans));
10502                                 kfree(nft_trans_chain_name(trans));
10503                                 nft_trans_destroy(trans);
10504                         } else {
10505                                 if (nft_trans_chain_bound(trans)) {
10506                                         nft_trans_destroy(trans);
10507                                         break;
10508                                 }
10509                                 nft_use_dec_restore(&trans->ctx.table->use);
10510                                 nft_chain_del(trans->ctx.chain);
10511                                 nf_tables_unregister_hook(trans->ctx.net,
10512                                                           trans->ctx.table,
10513                                                           trans->ctx.chain);
10514                         }
10515                         break;
10516                 case NFT_MSG_DELCHAIN:
10517                 case NFT_MSG_DESTROYCHAIN:
10518                         if (nft_trans_chain_update(trans)) {
10519                                 list_splice(&nft_trans_chain_hooks(trans),
10520                                             &nft_trans_basechain(trans)->hook_list);
10521                         } else {
10522                                 nft_use_inc_restore(&trans->ctx.table->use);
10523                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10524                         }
10525                         nft_trans_destroy(trans);
10526                         break;
10527                 case NFT_MSG_NEWRULE:
10528                         if (nft_trans_rule_bound(trans)) {
10529                                 nft_trans_destroy(trans);
10530                                 break;
10531                         }
10532                         nft_use_dec_restore(&trans->ctx.chain->use);
10533                         list_del_rcu(&nft_trans_rule(trans)->list);
10534                         nft_rule_expr_deactivate(&trans->ctx,
10535                                                  nft_trans_rule(trans),
10536                                                  NFT_TRANS_ABORT);
10537                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10538                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10539                         break;
10540                 case NFT_MSG_DELRULE:
10541                 case NFT_MSG_DESTROYRULE:
10542                         nft_use_inc_restore(&trans->ctx.chain->use);
10543                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10544                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10545                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10546                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10547
10548                         nft_trans_destroy(trans);
10549                         break;
10550                 case NFT_MSG_NEWSET:
10551                         if (nft_trans_set_update(trans)) {
10552                                 nft_trans_destroy(trans);
10553                                 break;
10554                         }
10555                         nft_use_dec_restore(&trans->ctx.table->use);
10556                         if (nft_trans_set_bound(trans)) {
10557                                 nft_trans_destroy(trans);
10558                                 break;
10559                         }
10560                         nft_trans_set(trans)->dead = 1;
10561                         list_del_rcu(&nft_trans_set(trans)->list);
10562                         break;
10563                 case NFT_MSG_DELSET:
10564                 case NFT_MSG_DESTROYSET:
10565                         nft_use_inc_restore(&trans->ctx.table->use);
10566                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10567                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10568                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10569
10570                         nft_trans_destroy(trans);
10571                         break;
10572                 case NFT_MSG_NEWSETELEM:
10573                         if (nft_trans_elem_set_bound(trans)) {
10574                                 nft_trans_destroy(trans);
10575                                 break;
10576                         }
10577                         te = (struct nft_trans_elem *)trans->data;
10578                         nft_setelem_remove(net, te->set, te->elem_priv);
10579                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10580                                 atomic_dec(&te->set->nelems);
10581
10582                         if (te->set->ops->abort &&
10583                             list_empty(&te->set->pending_update)) {
10584                                 list_add_tail(&te->set->pending_update,
10585                                               &set_update_list);
10586                         }
10587                         break;
10588                 case NFT_MSG_DELSETELEM:
10589                 case NFT_MSG_DESTROYSETELEM:
10590                         te = (struct nft_trans_elem *)trans->data;
10591
10592                         nft_setelem_data_activate(net, te->set, te->elem_priv);
10593                         nft_setelem_activate(net, te->set, te->elem_priv);
10594                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10595                                 te->set->ndeact--;
10596
10597                         if (te->set->ops->abort &&
10598                             list_empty(&te->set->pending_update)) {
10599                                 list_add_tail(&te->set->pending_update,
10600                                               &set_update_list);
10601                         }
10602                         nft_trans_destroy(trans);
10603                         break;
10604                 case NFT_MSG_NEWOBJ:
10605                         if (nft_trans_obj_update(trans)) {
10606                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10607                                 nft_trans_destroy(trans);
10608                         } else {
10609                                 nft_use_dec_restore(&trans->ctx.table->use);
10610                                 nft_obj_del(nft_trans_obj(trans));
10611                         }
10612                         break;
10613                 case NFT_MSG_DELOBJ:
10614                 case NFT_MSG_DESTROYOBJ:
10615                         nft_use_inc_restore(&trans->ctx.table->use);
10616                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10617                         nft_trans_destroy(trans);
10618                         break;
10619                 case NFT_MSG_NEWFLOWTABLE:
10620                         if (nft_trans_flowtable_update(trans)) {
10621                                 nft_unregister_flowtable_net_hooks(net,
10622                                                 &nft_trans_flowtable_hooks(trans));
10623                         } else {
10624                                 nft_use_dec_restore(&trans->ctx.table->use);
10625                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10626                                 nft_unregister_flowtable_net_hooks(net,
10627                                                 &nft_trans_flowtable(trans)->hook_list);
10628                         }
10629                         break;
10630                 case NFT_MSG_DELFLOWTABLE:
10631                 case NFT_MSG_DESTROYFLOWTABLE:
10632                         if (nft_trans_flowtable_update(trans)) {
10633                                 list_splice(&nft_trans_flowtable_hooks(trans),
10634                                             &nft_trans_flowtable(trans)->hook_list);
10635                         } else {
10636                                 nft_use_inc_restore(&trans->ctx.table->use);
10637                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10638                         }
10639                         nft_trans_destroy(trans);
10640                         break;
10641                 }
10642         }
10643
10644         nft_set_abort_update(&set_update_list);
10645
10646         synchronize_rcu();
10647
10648         list_for_each_entry_safe_reverse(trans, next,
10649                                          &nft_net->commit_list, list) {
10650                 nft_trans_list_del(trans);
10651                 nf_tables_abort_release(trans);
10652         }
10653
10654         if (action == NFNL_ABORT_AUTOLOAD)
10655                 nf_tables_module_autoload(net);
10656         else
10657                 nf_tables_module_autoload_cleanup(net);
10658
10659         return err;
10660 }
10661
10662 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10663                            enum nfnl_abort_action action)
10664 {
10665         struct nftables_pernet *nft_net = nft_pernet(net);
10666         unsigned int gc_seq;
10667         int ret;
10668
10669         gc_seq = nft_gc_seq_begin(nft_net);
10670         ret = __nf_tables_abort(net, action);
10671         nft_gc_seq_end(nft_net, gc_seq);
10672
10673         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
10674
10675         mutex_unlock(&nft_net->commit_mutex);
10676
10677         return ret;
10678 }
10679
10680 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10681 {
10682         struct nftables_pernet *nft_net = nft_pernet(net);
10683         bool genid_ok;
10684
10685         mutex_lock(&nft_net->commit_mutex);
10686         nft_net->tstamp = get_jiffies_64();
10687
10688         genid_ok = genid == 0 || nft_net->base_seq == genid;
10689         if (!genid_ok)
10690                 mutex_unlock(&nft_net->commit_mutex);
10691
10692         /* else, commit mutex has to be released by commit or abort function */
10693         return genid_ok;
10694 }
10695
10696 static const struct nfnetlink_subsystem nf_tables_subsys = {
10697         .name           = "nf_tables",
10698         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10699         .cb_count       = NFT_MSG_MAX,
10700         .cb             = nf_tables_cb,
10701         .commit         = nf_tables_commit,
10702         .abort          = nf_tables_abort,
10703         .valid_genid    = nf_tables_valid_genid,
10704         .owner          = THIS_MODULE,
10705 };
10706
10707 int nft_chain_validate_dependency(const struct nft_chain *chain,
10708                                   enum nft_chain_types type)
10709 {
10710         const struct nft_base_chain *basechain;
10711
10712         if (nft_is_base_chain(chain)) {
10713                 basechain = nft_base_chain(chain);
10714                 if (basechain->type->type != type)
10715                         return -EOPNOTSUPP;
10716         }
10717         return 0;
10718 }
10719 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10720
10721 int nft_chain_validate_hooks(const struct nft_chain *chain,
10722                              unsigned int hook_flags)
10723 {
10724         struct nft_base_chain *basechain;
10725
10726         if (nft_is_base_chain(chain)) {
10727                 basechain = nft_base_chain(chain);
10728
10729                 if ((1 << basechain->ops.hooknum) & hook_flags)
10730                         return 0;
10731
10732                 return -EOPNOTSUPP;
10733         }
10734
10735         return 0;
10736 }
10737 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10738
10739 /*
10740  * Loop detection - walk through the ruleset beginning at the destination chain
10741  * of a new jump until either the source chain is reached (loop) or all
10742  * reachable chains have been traversed.
10743  *
10744  * The loop check is performed whenever a new jump verdict is added to an
10745  * expression or verdict map or a verdict map is bound to a new chain.
10746  */
10747
10748 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10749                                  const struct nft_chain *chain);
10750
10751 static int nft_check_loops(const struct nft_ctx *ctx,
10752                            const struct nft_set_ext *ext)
10753 {
10754         const struct nft_data *data;
10755         int ret;
10756
10757         data = nft_set_ext_data(ext);
10758         switch (data->verdict.code) {
10759         case NFT_JUMP:
10760         case NFT_GOTO:
10761                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10762                 break;
10763         default:
10764                 ret = 0;
10765                 break;
10766         }
10767
10768         return ret;
10769 }
10770
10771 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10772                                         struct nft_set *set,
10773                                         const struct nft_set_iter *iter,
10774                                         struct nft_elem_priv *elem_priv)
10775 {
10776         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
10777
10778         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10779             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10780                 return 0;
10781
10782         return nft_check_loops(ctx, ext);
10783 }
10784
10785 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10786                                   struct nft_set *set)
10787 {
10788         u8 genmask = nft_genmask_next(ctx->net);
10789         struct nft_set_elem_catchall *catchall;
10790         struct nft_set_ext *ext;
10791         int ret = 0;
10792
10793         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10794                 ext = nft_set_elem_ext(set, catchall->elem);
10795                 if (!nft_set_elem_active(ext, genmask))
10796                         continue;
10797
10798                 ret = nft_check_loops(ctx, ext);
10799                 if (ret < 0)
10800                         return ret;
10801         }
10802
10803         return ret;
10804 }
10805
10806 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10807                                  const struct nft_chain *chain)
10808 {
10809         const struct nft_rule *rule;
10810         const struct nft_expr *expr, *last;
10811         struct nft_set *set;
10812         struct nft_set_binding *binding;
10813         struct nft_set_iter iter;
10814
10815         if (ctx->chain == chain)
10816                 return -ELOOP;
10817
10818         if (fatal_signal_pending(current))
10819                 return -EINTR;
10820
10821         list_for_each_entry(rule, &chain->rules, list) {
10822                 nft_rule_for_each_expr(expr, last, rule) {
10823                         struct nft_immediate_expr *priv;
10824                         const struct nft_data *data;
10825                         int err;
10826
10827                         if (strcmp(expr->ops->type->name, "immediate"))
10828                                 continue;
10829
10830                         priv = nft_expr_priv(expr);
10831                         if (priv->dreg != NFT_REG_VERDICT)
10832                                 continue;
10833
10834                         data = &priv->data;
10835                         switch (data->verdict.code) {
10836                         case NFT_JUMP:
10837                         case NFT_GOTO:
10838                                 err = nf_tables_check_loops(ctx,
10839                                                         data->verdict.chain);
10840                                 if (err < 0)
10841                                         return err;
10842                                 break;
10843                         default:
10844                                 break;
10845                         }
10846                 }
10847         }
10848
10849         list_for_each_entry(set, &ctx->table->sets, list) {
10850                 if (!nft_is_active_next(ctx->net, set))
10851                         continue;
10852                 if (!(set->flags & NFT_SET_MAP) ||
10853                     set->dtype != NFT_DATA_VERDICT)
10854                         continue;
10855
10856                 list_for_each_entry(binding, &set->bindings, list) {
10857                         if (!(binding->flags & NFT_SET_MAP) ||
10858                             binding->chain != chain)
10859                                 continue;
10860
10861                         iter.genmask    = nft_genmask_next(ctx->net);
10862                         iter.skip       = 0;
10863                         iter.count      = 0;
10864                         iter.err        = 0;
10865                         iter.fn         = nf_tables_loop_check_setelem;
10866
10867                         set->ops->walk(ctx, set, &iter);
10868                         if (!iter.err)
10869                                 iter.err = nft_set_catchall_loops(ctx, set);
10870
10871                         if (iter.err < 0)
10872                                 return iter.err;
10873                 }
10874         }
10875
10876         return 0;
10877 }
10878
10879 /**
10880  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10881  *
10882  *      @attr: netlink attribute to fetch value from
10883  *      @max: maximum value to be stored in dest
10884  *      @dest: pointer to the variable
10885  *
10886  *      Parse, check and store a given u32 netlink attribute into variable.
10887  *      This function returns -ERANGE if the value goes over maximum value.
10888  *      Otherwise a 0 is returned and the attribute value is stored in the
10889  *      destination variable.
10890  */
10891 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10892 {
10893         u32 val;
10894
10895         val = ntohl(nla_get_be32(attr));
10896         if (val > max)
10897                 return -ERANGE;
10898
10899         *dest = val;
10900         return 0;
10901 }
10902 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10903
10904 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10905 {
10906         unsigned int reg;
10907
10908         reg = ntohl(nla_get_be32(attr));
10909         switch (reg) {
10910         case NFT_REG_VERDICT...NFT_REG_4:
10911                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10912                 break;
10913         case NFT_REG32_00...NFT_REG32_15:
10914                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10915                 break;
10916         default:
10917                 return -ERANGE;
10918         }
10919
10920         return 0;
10921 }
10922
10923 /**
10924  *      nft_dump_register - dump a register value to a netlink attribute
10925  *
10926  *      @skb: socket buffer
10927  *      @attr: attribute number
10928  *      @reg: register number
10929  *
10930  *      Construct a netlink attribute containing the register number. For
10931  *      compatibility reasons, register numbers being a multiple of 4 are
10932  *      translated to the corresponding 128 bit register numbers.
10933  */
10934 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10935 {
10936         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10937                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10938         else
10939                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10940
10941         return nla_put_be32(skb, attr, htonl(reg));
10942 }
10943 EXPORT_SYMBOL_GPL(nft_dump_register);
10944
10945 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10946 {
10947         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10948                 return -EINVAL;
10949         if (len == 0)
10950                 return -EINVAL;
10951         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10952                 return -ERANGE;
10953
10954         return 0;
10955 }
10956
10957 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10958 {
10959         u32 reg;
10960         int err;
10961
10962         err = nft_parse_register(attr, &reg);
10963         if (err < 0)
10964                 return err;
10965
10966         err = nft_validate_register_load(reg, len);
10967         if (err < 0)
10968                 return err;
10969
10970         *sreg = reg;
10971         return 0;
10972 }
10973 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10974
10975 static int nft_validate_register_store(const struct nft_ctx *ctx,
10976                                        enum nft_registers reg,
10977                                        const struct nft_data *data,
10978                                        enum nft_data_types type,
10979                                        unsigned int len)
10980 {
10981         int err;
10982
10983         switch (reg) {
10984         case NFT_REG_VERDICT:
10985                 if (type != NFT_DATA_VERDICT)
10986                         return -EINVAL;
10987
10988                 if (data != NULL &&
10989                     (data->verdict.code == NFT_GOTO ||
10990                      data->verdict.code == NFT_JUMP)) {
10991                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10992                         if (err < 0)
10993                                 return err;
10994                 }
10995
10996                 return 0;
10997         default:
10998                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10999                         return -EINVAL;
11000                 if (len == 0)
11001                         return -EINVAL;
11002                 if (reg * NFT_REG32_SIZE + len >
11003                     sizeof_field(struct nft_regs, data))
11004                         return -ERANGE;
11005
11006                 if (data != NULL && type != NFT_DATA_VALUE)
11007                         return -EINVAL;
11008                 return 0;
11009         }
11010 }
11011
11012 int nft_parse_register_store(const struct nft_ctx *ctx,
11013                              const struct nlattr *attr, u8 *dreg,
11014                              const struct nft_data *data,
11015                              enum nft_data_types type, unsigned int len)
11016 {
11017         int err;
11018         u32 reg;
11019
11020         err = nft_parse_register(attr, &reg);
11021         if (err < 0)
11022                 return err;
11023
11024         err = nft_validate_register_store(ctx, reg, data, type, len);
11025         if (err < 0)
11026                 return err;
11027
11028         *dreg = reg;
11029         return 0;
11030 }
11031 EXPORT_SYMBOL_GPL(nft_parse_register_store);
11032
11033 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
11034         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
11035         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
11036                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
11037         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
11038 };
11039
11040 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
11041                             struct nft_data_desc *desc, const struct nlattr *nla)
11042 {
11043         u8 genmask = nft_genmask_next(ctx->net);
11044         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
11045         struct nft_chain *chain;
11046         int err;
11047
11048         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
11049                                           nft_verdict_policy, NULL);
11050         if (err < 0)
11051                 return err;
11052
11053         if (!tb[NFTA_VERDICT_CODE])
11054                 return -EINVAL;
11055
11056         /* zero padding hole for memcmp */
11057         memset(data, 0, sizeof(*data));
11058         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
11059
11060         switch (data->verdict.code) {
11061         case NF_ACCEPT:
11062         case NF_DROP:
11063         case NF_QUEUE:
11064                 break;
11065         case NFT_CONTINUE:
11066         case NFT_BREAK:
11067         case NFT_RETURN:
11068                 break;
11069         case NFT_JUMP:
11070         case NFT_GOTO:
11071                 if (tb[NFTA_VERDICT_CHAIN]) {
11072                         chain = nft_chain_lookup(ctx->net, ctx->table,
11073                                                  tb[NFTA_VERDICT_CHAIN],
11074                                                  genmask);
11075                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
11076                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
11077                                                       tb[NFTA_VERDICT_CHAIN_ID],
11078                                                       genmask);
11079                         if (IS_ERR(chain))
11080                                 return PTR_ERR(chain);
11081                 } else {
11082                         return -EINVAL;
11083                 }
11084
11085                 if (IS_ERR(chain))
11086                         return PTR_ERR(chain);
11087                 if (nft_is_base_chain(chain))
11088                         return -EOPNOTSUPP;
11089                 if (nft_chain_is_bound(chain))
11090                         return -EINVAL;
11091                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
11092                     chain->flags & NFT_CHAIN_BINDING)
11093                         return -EINVAL;
11094                 if (!nft_use_inc(&chain->use))
11095                         return -EMFILE;
11096
11097                 data->verdict.chain = chain;
11098                 break;
11099         default:
11100                 return -EINVAL;
11101         }
11102
11103         desc->len = sizeof(data->verdict);
11104
11105         return 0;
11106 }
11107
11108 static void nft_verdict_uninit(const struct nft_data *data)
11109 {
11110         struct nft_chain *chain;
11111
11112         switch (data->verdict.code) {
11113         case NFT_JUMP:
11114         case NFT_GOTO:
11115                 chain = data->verdict.chain;
11116                 nft_use_dec(&chain->use);
11117                 break;
11118         }
11119 }
11120
11121 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11122 {
11123         struct nlattr *nest;
11124
11125         nest = nla_nest_start_noflag(skb, type);
11126         if (!nest)
11127                 goto nla_put_failure;
11128
11129         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11130                 goto nla_put_failure;
11131
11132         switch (v->code) {
11133         case NFT_JUMP:
11134         case NFT_GOTO:
11135                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11136                                    v->chain->name))
11137                         goto nla_put_failure;
11138         }
11139         nla_nest_end(skb, nest);
11140         return 0;
11141
11142 nla_put_failure:
11143         return -1;
11144 }
11145
11146 static int nft_value_init(const struct nft_ctx *ctx,
11147                           struct nft_data *data, struct nft_data_desc *desc,
11148                           const struct nlattr *nla)
11149 {
11150         unsigned int len;
11151
11152         len = nla_len(nla);
11153         if (len == 0)
11154                 return -EINVAL;
11155         if (len > desc->size)
11156                 return -EOVERFLOW;
11157         if (desc->len) {
11158                 if (len != desc->len)
11159                         return -EINVAL;
11160         } else {
11161                 desc->len = len;
11162         }
11163
11164         nla_memcpy(data->data, nla, len);
11165
11166         return 0;
11167 }
11168
11169 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11170                           unsigned int len)
11171 {
11172         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11173 }
11174
11175 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11176         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
11177         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
11178 };
11179
11180 /**
11181  *      nft_data_init - parse nf_tables data netlink attributes
11182  *
11183  *      @ctx: context of the expression using the data
11184  *      @data: destination struct nft_data
11185  *      @desc: data description
11186  *      @nla: netlink attribute containing data
11187  *
11188  *      Parse the netlink data attributes and initialize a struct nft_data.
11189  *      The type and length of data are returned in the data description.
11190  *
11191  *      The caller can indicate that it only wants to accept data of type
11192  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
11193  */
11194 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11195                   struct nft_data_desc *desc, const struct nlattr *nla)
11196 {
11197         struct nlattr *tb[NFTA_DATA_MAX + 1];
11198         int err;
11199
11200         if (WARN_ON_ONCE(!desc->size))
11201                 return -EINVAL;
11202
11203         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11204                                           nft_data_policy, NULL);
11205         if (err < 0)
11206                 return err;
11207
11208         if (tb[NFTA_DATA_VALUE]) {
11209                 if (desc->type != NFT_DATA_VALUE)
11210                         return -EINVAL;
11211
11212                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11213         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11214                 if (desc->type != NFT_DATA_VERDICT)
11215                         return -EINVAL;
11216
11217                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11218         } else {
11219                 err = -EINVAL;
11220         }
11221
11222         return err;
11223 }
11224 EXPORT_SYMBOL_GPL(nft_data_init);
11225
11226 /**
11227  *      nft_data_release - release a nft_data item
11228  *
11229  *      @data: struct nft_data to release
11230  *      @type: type of data
11231  *
11232  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11233  *      all others need to be released by calling this function.
11234  */
11235 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11236 {
11237         if (type < NFT_DATA_VERDICT)
11238                 return;
11239         switch (type) {
11240         case NFT_DATA_VERDICT:
11241                 return nft_verdict_uninit(data);
11242         default:
11243                 WARN_ON(1);
11244         }
11245 }
11246 EXPORT_SYMBOL_GPL(nft_data_release);
11247
11248 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11249                   enum nft_data_types type, unsigned int len)
11250 {
11251         struct nlattr *nest;
11252         int err;
11253
11254         nest = nla_nest_start_noflag(skb, attr);
11255         if (nest == NULL)
11256                 return -1;
11257
11258         switch (type) {
11259         case NFT_DATA_VALUE:
11260                 err = nft_value_dump(skb, data, len);
11261                 break;
11262         case NFT_DATA_VERDICT:
11263                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11264                 break;
11265         default:
11266                 err = -EINVAL;
11267                 WARN_ON(1);
11268         }
11269
11270         nla_nest_end(skb, nest);
11271         return err;
11272 }
11273 EXPORT_SYMBOL_GPL(nft_data_dump);
11274
11275 int __nft_release_basechain(struct nft_ctx *ctx)
11276 {
11277         struct nft_rule *rule, *nr;
11278
11279         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11280                 return 0;
11281
11282         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11283         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11284                 list_del(&rule->list);
11285                 nft_use_dec(&ctx->chain->use);
11286                 nf_tables_rule_release(ctx, rule);
11287         }
11288         nft_chain_del(ctx->chain);
11289         nft_use_dec(&ctx->table->use);
11290         nf_tables_chain_destroy(ctx);
11291
11292         return 0;
11293 }
11294 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11295
11296 static void __nft_release_hook(struct net *net, struct nft_table *table)
11297 {
11298         struct nft_flowtable *flowtable;
11299         struct nft_chain *chain;
11300
11301         list_for_each_entry(chain, &table->chains, list)
11302                 __nf_tables_unregister_hook(net, table, chain, true);
11303         list_for_each_entry(flowtable, &table->flowtables, list)
11304                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11305                                                      true);
11306 }
11307
11308 static void __nft_release_hooks(struct net *net)
11309 {
11310         struct nftables_pernet *nft_net = nft_pernet(net);
11311         struct nft_table *table;
11312
11313         list_for_each_entry(table, &nft_net->tables, list) {
11314                 if (nft_table_has_owner(table))
11315                         continue;
11316
11317                 __nft_release_hook(net, table);
11318         }
11319 }
11320
11321 static void __nft_release_table(struct net *net, struct nft_table *table)
11322 {
11323         struct nft_flowtable *flowtable, *nf;
11324         struct nft_chain *chain, *nc;
11325         struct nft_object *obj, *ne;
11326         struct nft_rule *rule, *nr;
11327         struct nft_set *set, *ns;
11328         struct nft_ctx ctx = {
11329                 .net    = net,
11330                 .family = NFPROTO_NETDEV,
11331         };
11332
11333         ctx.family = table->family;
11334         ctx.table = table;
11335         list_for_each_entry(chain, &table->chains, list) {
11336                 if (nft_chain_binding(chain))
11337                         continue;
11338
11339                 ctx.chain = chain;
11340                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11341                         list_del(&rule->list);
11342                         nft_use_dec(&chain->use);
11343                         nf_tables_rule_release(&ctx, rule);
11344                 }
11345         }
11346         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11347                 list_del(&flowtable->list);
11348                 nft_use_dec(&table->use);
11349                 nf_tables_flowtable_destroy(flowtable);
11350         }
11351         list_for_each_entry_safe(set, ns, &table->sets, list) {
11352                 list_del(&set->list);
11353                 nft_use_dec(&table->use);
11354                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11355                         nft_map_deactivate(&ctx, set);
11356
11357                 nft_set_destroy(&ctx, set);
11358         }
11359         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11360                 nft_obj_del(obj);
11361                 nft_use_dec(&table->use);
11362                 nft_obj_destroy(&ctx, obj);
11363         }
11364         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11365                 ctx.chain = chain;
11366                 nft_chain_del(chain);
11367                 nft_use_dec(&table->use);
11368                 nf_tables_chain_destroy(&ctx);
11369         }
11370         nf_tables_table_destroy(&ctx);
11371 }
11372
11373 static void __nft_release_tables(struct net *net)
11374 {
11375         struct nftables_pernet *nft_net = nft_pernet(net);
11376         struct nft_table *table, *nt;
11377
11378         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11379                 if (nft_table_has_owner(table))
11380                         continue;
11381
11382                 list_del(&table->list);
11383
11384                 __nft_release_table(net, table);
11385         }
11386 }
11387
11388 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11389                             void *ptr)
11390 {
11391         struct nft_table *table, *to_delete[8];
11392         struct nftables_pernet *nft_net;
11393         struct netlink_notify *n = ptr;
11394         struct net *net = n->net;
11395         unsigned int deleted;
11396         bool restart = false;
11397         unsigned int gc_seq;
11398
11399         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11400                 return NOTIFY_DONE;
11401
11402         nft_net = nft_pernet(net);
11403         deleted = 0;
11404         mutex_lock(&nft_net->commit_mutex);
11405
11406         gc_seq = nft_gc_seq_begin(nft_net);
11407
11408         if (!list_empty(&nf_tables_destroy_list))
11409                 nf_tables_trans_destroy_flush_work();
11410 again:
11411         list_for_each_entry(table, &nft_net->tables, list) {
11412                 if (nft_table_has_owner(table) &&
11413                     n->portid == table->nlpid) {
11414                         if (table->flags & NFT_TABLE_F_PERSIST) {
11415                                 table->flags &= ~NFT_TABLE_F_OWNER;
11416                                 continue;
11417                         }
11418                         __nft_release_hook(net, table);
11419                         list_del_rcu(&table->list);
11420                         to_delete[deleted++] = table;
11421                         if (deleted >= ARRAY_SIZE(to_delete))
11422                                 break;
11423                 }
11424         }
11425         if (deleted) {
11426                 restart = deleted >= ARRAY_SIZE(to_delete);
11427                 synchronize_rcu();
11428                 while (deleted)
11429                         __nft_release_table(net, to_delete[--deleted]);
11430
11431                 if (restart)
11432                         goto again;
11433         }
11434         nft_gc_seq_end(nft_net, gc_seq);
11435
11436         mutex_unlock(&nft_net->commit_mutex);
11437
11438         return NOTIFY_DONE;
11439 }
11440
11441 static struct notifier_block nft_nl_notifier = {
11442         .notifier_call  = nft_rcv_nl_event,
11443 };
11444
11445 static int __net_init nf_tables_init_net(struct net *net)
11446 {
11447         struct nftables_pernet *nft_net = nft_pernet(net);
11448
11449         INIT_LIST_HEAD(&nft_net->tables);
11450         INIT_LIST_HEAD(&nft_net->commit_list);
11451         INIT_LIST_HEAD(&nft_net->binding_list);
11452         INIT_LIST_HEAD(&nft_net->module_list);
11453         INIT_LIST_HEAD(&nft_net->notify_list);
11454         mutex_init(&nft_net->commit_mutex);
11455         nft_net->base_seq = 1;
11456         nft_net->gc_seq = 0;
11457         nft_net->validate_state = NFT_VALIDATE_SKIP;
11458
11459         return 0;
11460 }
11461
11462 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11463 {
11464         struct nftables_pernet *nft_net = nft_pernet(net);
11465
11466         mutex_lock(&nft_net->commit_mutex);
11467         __nft_release_hooks(net);
11468         mutex_unlock(&nft_net->commit_mutex);
11469 }
11470
11471 static void __net_exit nf_tables_exit_net(struct net *net)
11472 {
11473         struct nftables_pernet *nft_net = nft_pernet(net);
11474         unsigned int gc_seq;
11475
11476         mutex_lock(&nft_net->commit_mutex);
11477
11478         gc_seq = nft_gc_seq_begin(nft_net);
11479
11480         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
11481
11482         if (!list_empty(&nft_net->module_list))
11483                 nf_tables_module_autoload_cleanup(net);
11484
11485         __nft_release_tables(net);
11486
11487         nft_gc_seq_end(nft_net, gc_seq);
11488
11489         mutex_unlock(&nft_net->commit_mutex);
11490         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11491         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11492         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11493 }
11494
11495 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11496 {
11497         flush_work(&trans_gc_work);
11498 }
11499
11500 static struct pernet_operations nf_tables_net_ops = {
11501         .init           = nf_tables_init_net,
11502         .pre_exit       = nf_tables_pre_exit_net,
11503         .exit           = nf_tables_exit_net,
11504         .exit_batch     = nf_tables_exit_batch,
11505         .id             = &nf_tables_net_id,
11506         .size           = sizeof(struct nftables_pernet),
11507 };
11508
11509 static int __init nf_tables_module_init(void)
11510 {
11511         int err;
11512
11513         err = register_pernet_subsys(&nf_tables_net_ops);
11514         if (err < 0)
11515                 return err;
11516
11517         err = nft_chain_filter_init();
11518         if (err < 0)
11519                 goto err_chain_filter;
11520
11521         err = nf_tables_core_module_init();
11522         if (err < 0)
11523                 goto err_core_module;
11524
11525         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11526         if (err < 0)
11527                 goto err_netdev_notifier;
11528
11529         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11530         if (err < 0)
11531                 goto err_rht_objname;
11532
11533         err = nft_offload_init();
11534         if (err < 0)
11535                 goto err_offload;
11536
11537         err = netlink_register_notifier(&nft_nl_notifier);
11538         if (err < 0)
11539                 goto err_netlink_notifier;
11540
11541         /* must be last */
11542         err = nfnetlink_subsys_register(&nf_tables_subsys);
11543         if (err < 0)
11544                 goto err_nfnl_subsys;
11545
11546         nft_chain_route_init();
11547
11548         return err;
11549
11550 err_nfnl_subsys:
11551         netlink_unregister_notifier(&nft_nl_notifier);
11552 err_netlink_notifier:
11553         nft_offload_exit();
11554 err_offload:
11555         rhltable_destroy(&nft_objname_ht);
11556 err_rht_objname:
11557         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11558 err_netdev_notifier:
11559         nf_tables_core_module_exit();
11560 err_core_module:
11561         nft_chain_filter_fini();
11562 err_chain_filter:
11563         unregister_pernet_subsys(&nf_tables_net_ops);
11564         return err;
11565 }
11566
11567 static void __exit nf_tables_module_exit(void)
11568 {
11569         nfnetlink_subsys_unregister(&nf_tables_subsys);
11570         netlink_unregister_notifier(&nft_nl_notifier);
11571         nft_offload_exit();
11572         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11573         nft_chain_filter_fini();
11574         nft_chain_route_fini();
11575         unregister_pernet_subsys(&nf_tables_net_ops);
11576         cancel_work_sync(&trans_gc_work);
11577         cancel_work_sync(&trans_destroy_work);
11578         rcu_barrier();
11579         rhltable_destroy(&nft_objname_ht);
11580         nf_tables_core_module_exit();
11581 }
11582
11583 module_init(nf_tables_module_init);
11584 module_exit(nf_tables_module_exit);
11585
11586 MODULE_LICENSE("GPL");
11587 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11588 MODULE_DESCRIPTION("Framework for packet filtering and classification");
11589 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);