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