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