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
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 106 {
 107         struct nftables_pernet *nft_net = nft_pernet(net);
 108
 109         switch (nft_net->validate_state) {
 110         case NFT_VALIDATE_SKIP:
 111                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 112                 break;
 113         case NFT_VALIDATE_NEED:
 114                 break;
 115         case NFT_VALIDATE_DO:
 116                 if (new_validate_state == NFT_VALIDATE_NEED)
 117                         return;
 118         }
 119
 120         nft_net->validate_state = new_validate_state;
 121 }
 122 static void nf_tables_trans_destroy_work(struct work_struct *w);
 123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 124
 125 static void nft_ctx_init(struct nft_ctx *ctx,
 126                          struct net *net,
 127                          const struct sk_buff *skb,
 128                          const struct nlmsghdr *nlh,
 129                          u8 family,
 130                          struct nft_table *table,
 131                          struct nft_chain *chain,
 132                          const struct nlattr * const *nla)
 133 {
 134         ctx->net        = net;
 135         ctx->family     = family;
 136         ctx->level      = 0;
 137         ctx->table      = table;
 138         ctx->chain      = chain;
 139         ctx->nla        = nla;
 140         ctx->portid     = NETLINK_CB(skb).portid;
 141         ctx->report     = nlmsg_report(nlh);
 142         ctx->flags      = nlh->nlmsg_flags;
 143         ctx->seq        = nlh->nlmsg_seq;
 144 }
 145
 146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 147                                              int msg_type, u32 size, gfp_t gfp)
 148 {
 149         struct nft_trans *trans;
 150
 151         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 152         if (trans == NULL)
 153                 return NULL;
 154
 155         INIT_LIST_HEAD(&trans->list);
 156         trans->msg_type = msg_type;
 157         trans->ctx      = *ctx;
 158
 159         return trans;
 160 }
 161
 162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 163                                          int msg_type, u32 size)
 164 {
 165         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 166 }
 167
 168 static void nft_trans_destroy(struct nft_trans *trans)
 169 {
 170         list_del(&trans->list);
 171         kfree(trans);
 172 }
 173
 174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 175 {
 176         struct nftables_pernet *nft_net;
 177         struct net *net = ctx->net;
 178         struct nft_trans *trans;
 179
 180         if (!nft_set_is_anonymous(set))
 181                 return;
 182
 183         nft_net = nft_pernet(net);
 184         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 185                 switch (trans->msg_type) {
 186                 case NFT_MSG_NEWSET:
 187                         if (nft_trans_set(trans) == set)
 188                                 nft_trans_set_bound(trans) = true;
 189                         break;
 190                 case NFT_MSG_NEWSETELEM:
 191                         if (nft_trans_elem_set(trans) == set)
 192                                 nft_trans_elem_set_bound(trans) = true;
 193                         break;
 194                 }
 195         }
 196 }
 197
 198 static int nft_netdev_register_hooks(struct net *net,
 199                                      struct list_head *hook_list)
 200 {
 201         struct nft_hook *hook;
 202         int err, j;
 203
 204         j = 0;
 205         list_for_each_entry(hook, hook_list, list) {
 206                 err = nf_register_net_hook(net, &hook->ops);
 207                 if (err < 0)
 208                         goto err_register;
 209
 210                 j++;
 211         }
 212         return 0;
 213
 214 err_register:
 215         list_for_each_entry(hook, hook_list, list) {
 216                 if (j-- <= 0)
 217                         break;
 218
 219                 nf_unregister_net_hook(net, &hook->ops);
 220         }
 221         return err;
 222 }
 223
 224 static void nft_netdev_unregister_hooks(struct net *net,
 225                                         struct list_head *hook_list,
 226                                         bool release_netdev)
 227 {
 228         struct nft_hook *hook, *next;
 229
 230         list_for_each_entry_safe(hook, next, hook_list, list) {
 231                 nf_unregister_net_hook(net, &hook->ops);
 232                 if (release_netdev) {
 233                         list_del(&hook->list);
 234                         kfree_rcu(hook, rcu);
 235                 }
 236         }
 237 }
 238
 239 static int nf_tables_register_hook(struct net *net,
 240                                    const struct nft_table *table,
 241                                    struct nft_chain *chain)
 242 {
 243         struct nft_base_chain *basechain;
 244         const struct nf_hook_ops *ops;
 245
 246         if (table->flags & NFT_TABLE_F_DORMANT ||
 247             !nft_is_base_chain(chain))
 248                 return 0;
 249
 250         basechain = nft_base_chain(chain);
 251         ops = &basechain->ops;
 252
 253         if (basechain->type->ops_register)
 254                 return basechain->type->ops_register(net, ops);
 255
 256         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 257                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 258
 259         return nf_register_net_hook(net, &basechain->ops);
 260 }
 261
 262 static void __nf_tables_unregister_hook(struct net *net,
 263                                         const struct nft_table *table,
 264                                         struct nft_chain *chain,
 265                                         bool release_netdev)
 266 {
 267         struct nft_base_chain *basechain;
 268         const struct nf_hook_ops *ops;
 269
 270         if (table->flags & NFT_TABLE_F_DORMANT ||
 271             !nft_is_base_chain(chain))
 272                 return;
 273         basechain = nft_base_chain(chain);
 274         ops = &basechain->ops;
 275
 276         if (basechain->type->ops_unregister)
 277                 return basechain->type->ops_unregister(net, ops);
 278
 279         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 280                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 281                                             release_netdev);
 282         else
 283                 nf_unregister_net_hook(net, &basechain->ops);
 284 }
 285
 286 static void nf_tables_unregister_hook(struct net *net,
 287                                       const struct nft_table *table,
 288                                       struct nft_chain *chain)
 289 {
 290         return __nf_tables_unregister_hook(net, table, chain, false);
 291 }
 292
 293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 294 {
 295         struct nftables_pernet *nft_net = nft_pernet(net);
 296
 297         list_add_tail(&trans->list, &nft_net->commit_list);
 298 }
 299
 300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 301 {
 302         struct nft_trans *trans;
 303
 304         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 305         if (trans == NULL)
 306                 return -ENOMEM;
 307
 308         if (msg_type == NFT_MSG_NEWTABLE)
 309                 nft_activate_next(ctx->net, ctx->table);
 310
 311         nft_trans_commit_list_add_tail(ctx->net, trans);
 312         return 0;
 313 }
 314
 315 static int nft_deltable(struct nft_ctx *ctx)
 316 {
 317         int err;
 318
 319         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 320         if (err < 0)
 321                 return err;
 322
 323         nft_deactivate_next(ctx->net, ctx->table);
 324         return err;
 325 }
 326
 327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 328 {
 329         struct nft_trans *trans;
 330
 331         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 332         if (trans == NULL)
 333                 return ERR_PTR(-ENOMEM);
 334
 335         if (msg_type == NFT_MSG_NEWCHAIN) {
 336                 nft_activate_next(ctx->net, ctx->chain);
 337
 338                 if (ctx->nla[NFTA_CHAIN_ID]) {
 339                         nft_trans_chain_id(trans) =
 340                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 341                 }
 342         }
 343
 344         nft_trans_commit_list_add_tail(ctx->net, trans);
 345         return trans;
 346 }
 347
 348 static int nft_delchain(struct nft_ctx *ctx)
 349 {
 350         struct nft_trans *trans;
 351
 352         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 353         if (IS_ERR(trans))
 354                 return PTR_ERR(trans);
 355
 356         ctx->table->use--;
 357         nft_deactivate_next(ctx->net, ctx->chain);
 358
 359         return 0;
 360 }
 361
 362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 363                                    struct nft_rule *rule)
 364 {
 365         struct nft_expr *expr;
 366
 367         expr = nft_expr_first(rule);
 368         while (nft_expr_more(rule, expr)) {
 369                 if (expr->ops->activate)
 370                         expr->ops->activate(ctx, expr);
 371
 372                 expr = nft_expr_next(expr);
 373         }
 374 }
 375
 376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 377                                      struct nft_rule *rule,
 378                                      enum nft_trans_phase phase)
 379 {
 380         struct nft_expr *expr;
 381
 382         expr = nft_expr_first(rule);
 383         while (nft_expr_more(rule, expr)) {
 384                 if (expr->ops->deactivate)
 385                         expr->ops->deactivate(ctx, expr, phase);
 386
 387                 expr = nft_expr_next(expr);
 388         }
 389 }
 390
 391 static int
 392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 393 {
 394         /* You cannot delete the same rule twice */
 395         if (nft_is_active_next(ctx->net, rule)) {
 396                 nft_deactivate_next(ctx->net, rule);
 397                 ctx->chain->use--;
 398                 return 0;
 399         }
 400         return -ENOENT;
 401 }
 402
 403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 404                                             struct nft_rule *rule)
 405 {
 406         struct nft_trans *trans;
 407
 408         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 409         if (trans == NULL)
 410                 return NULL;
 411
 412         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 413                 nft_trans_rule_id(trans) =
 414                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 415         }
 416         nft_trans_rule(trans) = rule;
 417         nft_trans_commit_list_add_tail(ctx->net, trans);
 418
 419         return trans;
 420 }
 421
 422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 423 {
 424         struct nft_flow_rule *flow;
 425         struct nft_trans *trans;
 426         int err;
 427
 428         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 429         if (trans == NULL)
 430                 return -ENOMEM;
 431
 432         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 433                 flow = nft_flow_rule_create(ctx->net, rule);
 434                 if (IS_ERR(flow)) {
 435                         nft_trans_destroy(trans);
 436                         return PTR_ERR(flow);
 437                 }
 438
 439                 nft_trans_flow_rule(trans) = flow;
 440         }
 441
 442         err = nf_tables_delrule_deactivate(ctx, rule);
 443         if (err < 0) {
 444                 nft_trans_destroy(trans);
 445                 return err;
 446         }
 447         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 448
 449         return 0;
 450 }
 451
 452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 453 {
 454         struct nft_rule *rule;
 455         int err;
 456
 457         list_for_each_entry(rule, &ctx->chain->rules, list) {
 458                 if (!nft_is_active_next(ctx->net, rule))
 459                         continue;
 460
 461                 err = nft_delrule(ctx, rule);
 462                 if (err < 0)
 463                         return err;
 464         }
 465         return 0;
 466 }
 467
 468 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 469                              struct nft_set *set)
 470 {
 471         struct nft_trans *trans;
 472
 473         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 474         if (trans == NULL)
 475                 return -ENOMEM;
 476
 477         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 478                 nft_trans_set_id(trans) =
 479                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 480                 nft_activate_next(ctx->net, set);
 481         }
 482         nft_trans_set(trans) = set;
 483         nft_trans_commit_list_add_tail(ctx->net, trans);
 484
 485         return 0;
 486 }
 487
 488 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 489 {
 490         int err;
 491
 492         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 493         if (err < 0)
 494                 return err;
 495
 496         nft_deactivate_next(ctx->net, set);
 497         ctx->table->use--;
 498
 499         return err;
 500 }
 501
 502 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 503                              struct nft_object *obj)
 504 {
 505         struct nft_trans *trans;
 506
 507         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 508         if (trans == NULL)
 509                 return -ENOMEM;
 510
 511         if (msg_type == NFT_MSG_NEWOBJ)
 512                 nft_activate_next(ctx->net, obj);
 513
 514         nft_trans_obj(trans) = obj;
 515         nft_trans_commit_list_add_tail(ctx->net, trans);
 516
 517         return 0;
 518 }
 519
 520 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 521 {
 522         int err;
 523
 524         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 525         if (err < 0)
 526                 return err;
 527
 528         nft_deactivate_next(ctx->net, obj);
 529         ctx->table->use--;
 530
 531         return err;
 532 }
 533
 534 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 535                                    struct nft_flowtable *flowtable)
 536 {
 537         struct nft_trans *trans;
 538
 539         trans = nft_trans_alloc(ctx, msg_type,
 540                                 sizeof(struct nft_trans_flowtable));
 541         if (trans == NULL)
 542                 return -ENOMEM;
 543
 544         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 545                 nft_activate_next(ctx->net, flowtable);
 546
 547         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 548         nft_trans_flowtable(trans) = flowtable;
 549         nft_trans_commit_list_add_tail(ctx->net, trans);
 550
 551         return 0;
 552 }
 553
 554 static int nft_delflowtable(struct nft_ctx *ctx,
 555                             struct nft_flowtable *flowtable)
 556 {
 557         int err;
 558
 559         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 560         if (err < 0)
 561                 return err;
 562
 563         nft_deactivate_next(ctx->net, flowtable);
 564         ctx->table->use--;
 565
 566         return err;
 567 }
 568
 569 /*
 570  * Tables
 571  */
 572
 573 static struct nft_table *nft_table_lookup(const struct net *net,
 574                                           const struct nlattr *nla,
 575                                           u8 family, u8 genmask, u32 nlpid)
 576 {
 577         struct nftables_pernet *nft_net;
 578         struct nft_table *table;
 579
 580         if (nla == NULL)
 581                 return ERR_PTR(-EINVAL);
 582
 583         nft_net = nft_pernet(net);
 584         list_for_each_entry_rcu(table, &nft_net->tables, list,
 585                                 lockdep_is_held(&nft_net->commit_mutex)) {
 586                 if (!nla_strcmp(nla, table->name) &&
 587                     table->family == family &&
 588                     nft_active_genmask(table, genmask)) {
 589                         if (nft_table_has_owner(table) &&
 590                             nlpid && table->nlpid != nlpid)
 591                                 return ERR_PTR(-EPERM);
 592
 593                         return table;
 594                 }
 595         }
 596
 597         return ERR_PTR(-ENOENT);
 598 }
 599
 600 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 601                                                    const struct nlattr *nla,
 602                                                    u8 genmask, u32 nlpid)
 603 {
 604         struct nftables_pernet *nft_net;
 605         struct nft_table *table;
 606
 607         nft_net = nft_pernet(net);
 608         list_for_each_entry(table, &nft_net->tables, list) {
 609                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 610                     nft_active_genmask(table, genmask)) {
 611                         if (nft_table_has_owner(table) &&
 612                             nlpid && table->nlpid != nlpid)
 613                                 return ERR_PTR(-EPERM);
 614
 615                         return table;
 616                 }
 617         }
 618
 619         return ERR_PTR(-ENOENT);
 620 }
 621
 622 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 623 {
 624         return ++table->hgenerator;
 625 }
 626
 627 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 628
 629 static const struct nft_chain_type *
 630 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 631 {
 632         if (family >= NFPROTO_NUMPROTO ||
 633             type >= NFT_CHAIN_T_MAX)
 634                 return NULL;
 635
 636         return chain_type[family][type];
 637 }
 638
 639 static const struct nft_chain_type *
 640 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 641 {
 642         const struct nft_chain_type *type;
 643         int i;
 644
 645         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 646                 type = __nft_chain_type_get(family, i);
 647                 if (!type)
 648                         continue;
 649                 if (!nla_strcmp(nla, type->name))
 650                         return type;
 651         }
 652         return NULL;
 653 }
 654
 655 struct nft_module_request {
 656         struct list_head        list;
 657         char                    module[MODULE_NAME_LEN];
 658         bool                    done;
 659 };
 660
 661 #ifdef CONFIG_MODULES
 662 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 663                                       ...)
 664 {
 665         char module_name[MODULE_NAME_LEN];
 666         struct nftables_pernet *nft_net;
 667         struct nft_module_request *req;
 668         va_list args;
 669         int ret;
 670
 671         va_start(args, fmt);
 672         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 673         va_end(args);
 674         if (ret >= MODULE_NAME_LEN)
 675                 return 0;
 676
 677         nft_net = nft_pernet(net);
 678         list_for_each_entry(req, &nft_net->module_list, list) {
 679                 if (!strcmp(req->module, module_name)) {
 680                         if (req->done)
 681                                 return 0;
 682
 683                         /* A request to load this module already exists. */
 684                         return -EAGAIN;
 685                 }
 686         }
 687
 688         req = kmalloc(sizeof(*req), GFP_KERNEL);
 689         if (!req)
 690                 return -ENOMEM;
 691
 692         req->done = false;
 693         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 694         list_add_tail(&req->list, &nft_net->module_list);
 695
 696         return -EAGAIN;
 697 }
 698 EXPORT_SYMBOL_GPL(nft_request_module);
 699 #endif
 700
 701 static void lockdep_nfnl_nft_mutex_not_held(void)
 702 {
 703 #ifdef CONFIG_PROVE_LOCKING
 704         if (debug_locks)
 705                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 706 #endif
 707 }
 708
 709 static const struct nft_chain_type *
 710 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 711                             u8 family, bool autoload)
 712 {
 713         const struct nft_chain_type *type;
 714
 715         type = __nf_tables_chain_type_lookup(nla, family);
 716         if (type != NULL)
 717                 return type;
 718
 719         lockdep_nfnl_nft_mutex_not_held();
 720 #ifdef CONFIG_MODULES
 721         if (autoload) {
 722                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 723                                        nla_len(nla),
 724                                        (const char *)nla_data(nla)) == -EAGAIN)
 725                         return ERR_PTR(-EAGAIN);
 726         }
 727 #endif
 728         return ERR_PTR(-ENOENT);
 729 }
 730
 731 static __be16 nft_base_seq(const struct net *net)
 732 {
 733         struct nftables_pernet *nft_net = nft_pernet(net);
 734
 735         return htons(nft_net->base_seq & 0xffff);
 736 }
 737
 738 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 739         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 740                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 741         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 742         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 743         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 744                                     .len = NFT_USERDATA_MAXLEN }
 745 };
 746
 747 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 748                                      u32 portid, u32 seq, int event, u32 flags,
 749                                      int family, const struct nft_table *table)
 750 {
 751         struct nlmsghdr *nlh;
 752
 753         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 754         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 755                            NFNETLINK_V0, nft_base_seq(net));
 756         if (!nlh)
 757                 goto nla_put_failure;
 758
 759         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 760             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 761                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 762             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 763             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 764                          NFTA_TABLE_PAD))
 765                 goto nla_put_failure;
 766         if (nft_table_has_owner(table) &&
 767             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 768                 goto nla_put_failure;
 769
 770         if (table->udata) {
 771                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 772                         goto nla_put_failure;
 773         }
 774
 775         nlmsg_end(skb, nlh);
 776         return 0;
 777
 778 nla_put_failure:
 779         nlmsg_trim(skb, nlh);
 780         return -1;
 781 }
 782
 783 struct nftnl_skb_parms {
 784         bool report;
 785 };
 786 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 787
 788 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 789                                struct list_head *notify_list)
 790 {
 791         NFT_CB(skb).report = report;
 792         list_add_tail(&skb->list, notify_list);
 793 }
 794
 795 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 796 {
 797         struct nftables_pernet *nft_net;
 798         struct sk_buff *skb;
 799         u16 flags = 0;
 800         int err;
 801
 802         if (!ctx->report &&
 803             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 804                 return;
 805
 806         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 807         if (skb == NULL)
 808                 goto err;
 809
 810         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 811                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 812
 813         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 814                                         event, flags, ctx->family, ctx->table);
 815         if (err < 0) {
 816                 kfree_skb(skb);
 817                 goto err;
 818         }
 819
 820         nft_net = nft_pernet(ctx->net);
 821         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 822         return;
 823 err:
 824         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 825 }
 826
 827 static int nf_tables_dump_tables(struct sk_buff *skb,
 828                                  struct netlink_callback *cb)
 829 {
 830         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 831         struct nftables_pernet *nft_net;
 832         const struct nft_table *table;
 833         unsigned int idx = 0, s_idx = cb->args[0];
 834         struct net *net = sock_net(skb->sk);
 835         int family = nfmsg->nfgen_family;
 836
 837         rcu_read_lock();
 838         nft_net = nft_pernet(net);
 839         cb->seq = READ_ONCE(nft_net->base_seq);
 840
 841         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 842                 if (family != NFPROTO_UNSPEC && family != table->family)
 843                         continue;
 844
 845                 if (idx < s_idx)
 846                         goto cont;
 847                 if (idx > s_idx)
 848                         memset(&cb->args[1], 0,
 849                                sizeof(cb->args) - sizeof(cb->args[0]));
 850                 if (!nft_is_active(net, table))
 851                         continue;
 852                 if (nf_tables_fill_table_info(skb, net,
 853                                               NETLINK_CB(cb->skb).portid,
 854                                               cb->nlh->nlmsg_seq,
 855                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 856                                               table->family, table) < 0)
 857                         goto done;
 858
 859                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 860 cont:
 861                 idx++;
 862         }
 863 done:
 864         rcu_read_unlock();
 865         cb->args[0] = idx;
 866         return skb->len;
 867 }
 868
 869 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 870                                       const struct nlmsghdr *nlh,
 871                                       struct netlink_dump_control *c)
 872 {
 873         int err;
 874
 875         if (!try_module_get(THIS_MODULE))
 876                 return -EINVAL;
 877
 878         rcu_read_unlock();
 879         err = netlink_dump_start(nlsk, skb, nlh, c);
 880         rcu_read_lock();
 881         module_put(THIS_MODULE);
 882
 883         return err;
 884 }
 885
 886 /* called with rcu_read_lock held */
 887 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 888                               const struct nlattr * const nla[])
 889 {
 890         struct netlink_ext_ack *extack = info->extack;
 891         u8 genmask = nft_genmask_cur(info->net);
 892         u8 family = info->nfmsg->nfgen_family;
 893         const struct nft_table *table;
 894         struct net *net = info->net;
 895         struct sk_buff *skb2;
 896         int err;
 897
 898         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 899                 struct netlink_dump_control c = {
 900                         .dump = nf_tables_dump_tables,
 901                         .module = THIS_MODULE,
 902                 };
 903
 904                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 905         }
 906
 907         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 908         if (IS_ERR(table)) {
 909                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 910                 return PTR_ERR(table);
 911         }
 912
 913         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 914         if (!skb2)
 915                 return -ENOMEM;
 916
 917         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 918                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 919                                         0, family, table);
 920         if (err < 0)
 921                 goto err_fill_table_info;
 922
 923         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 924
 925 err_fill_table_info:
 926         kfree_skb(skb2);
 927         return err;
 928 }
 929
 930 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 931 {
 932         struct nft_chain *chain;
 933         u32 i = 0;
 934
 935         list_for_each_entry(chain, &table->chains, list) {
 936                 if (!nft_is_active_next(net, chain))
 937                         continue;
 938                 if (!nft_is_base_chain(chain))
 939                         continue;
 940
 941                 if (cnt && i++ == cnt)
 942                         break;
 943
 944                 nf_tables_unregister_hook(net, table, chain);
 945         }
 946 }
 947
 948 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 949 {
 950         struct nft_chain *chain;
 951         int err, i = 0;
 952
 953         list_for_each_entry(chain, &table->chains, list) {
 954                 if (!nft_is_active_next(net, chain))
 955                         continue;
 956                 if (!nft_is_base_chain(chain))
 957                         continue;
 958
 959                 err = nf_tables_register_hook(net, table, chain);
 960                 if (err < 0)
 961                         goto err_register_hooks;
 962
 963                 i++;
 964         }
 965         return 0;
 966
 967 err_register_hooks:
 968         if (i)
 969                 nft_table_disable(net, table, i);
 970         return err;
 971 }
 972
 973 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 974 {
 975         table->flags &= ~NFT_TABLE_F_DORMANT;
 976         nft_table_disable(net, table, 0);
 977         table->flags |= NFT_TABLE_F_DORMANT;
 978 }
 979
 980 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
 981 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
 982 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
 983 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
 984                                          __NFT_TABLE_F_WAS_AWAKEN)
 985
 986 static int nf_tables_updtable(struct nft_ctx *ctx)
 987 {
 988         struct nft_trans *trans;
 989         u32 flags;
 990         int ret;
 991
 992         if (!ctx->nla[NFTA_TABLE_FLAGS])
 993                 return 0;
 994
 995         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 996         if (flags & ~NFT_TABLE_F_MASK)
 997                 return -EOPNOTSUPP;
 998
 999         if (flags == ctx->table->flags)
1000                 return 0;
1001
1002         if ((nft_table_has_owner(ctx->table) &&
1003              !(flags & NFT_TABLE_F_OWNER)) ||
1004             (!nft_table_has_owner(ctx->table) &&
1005              flags & NFT_TABLE_F_OWNER))
1006                 return -EOPNOTSUPP;
1007
1008         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1009                                 sizeof(struct nft_trans_table));
1010         if (trans == NULL)
1011                 return -ENOMEM;
1012
1013         if ((flags & NFT_TABLE_F_DORMANT) &&
1014             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1015                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1016                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1017                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1018         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1019                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1020                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1021                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1022                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1023                         if (ret < 0)
1024                                 goto err_register_hooks;
1025
1026                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1027                 }
1028         }
1029
1030         nft_trans_table_update(trans) = true;
1031         nft_trans_commit_list_add_tail(ctx->net, trans);
1032
1033         return 0;
1034
1035 err_register_hooks:
1036         nft_trans_destroy(trans);
1037         return ret;
1038 }
1039
1040 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1041 {
1042         const char *name = data;
1043
1044         return jhash(name, strlen(name), seed);
1045 }
1046
1047 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1048 {
1049         const struct nft_chain *chain = data;
1050
1051         return nft_chain_hash(chain->name, 0, seed);
1052 }
1053
1054 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1055                               const void *ptr)
1056 {
1057         const struct nft_chain *chain = ptr;
1058         const char *name = arg->key;
1059
1060         return strcmp(chain->name, name);
1061 }
1062
1063 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1064 {
1065         const struct nft_object_hash_key *k = data;
1066
1067         seed ^= hash_ptr(k->table, 32);
1068
1069         return jhash(k->name, strlen(k->name), seed);
1070 }
1071
1072 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1073 {
1074         const struct nft_object *obj = data;
1075
1076         return nft_objname_hash(&obj->key, 0, seed);
1077 }
1078
1079 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1080                                 const void *ptr)
1081 {
1082         const struct nft_object_hash_key *k = arg->key;
1083         const struct nft_object *obj = ptr;
1084
1085         if (obj->key.table != k->table)
1086                 return -1;
1087
1088         return strcmp(obj->key.name, k->name);
1089 }
1090
1091 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1092                               const struct nlattr * const nla[])
1093 {
1094         struct nftables_pernet *nft_net = nft_pernet(info->net);
1095         struct netlink_ext_ack *extack = info->extack;
1096         u8 genmask = nft_genmask_next(info->net);
1097         u8 family = info->nfmsg->nfgen_family;
1098         struct net *net = info->net;
1099         const struct nlattr *attr;
1100         struct nft_table *table;
1101         struct nft_ctx ctx;
1102         u32 flags = 0;
1103         int err;
1104
1105         lockdep_assert_held(&nft_net->commit_mutex);
1106         attr = nla[NFTA_TABLE_NAME];
1107         table = nft_table_lookup(net, attr, family, genmask,
1108                                  NETLINK_CB(skb).portid);
1109         if (IS_ERR(table)) {
1110                 if (PTR_ERR(table) != -ENOENT)
1111                         return PTR_ERR(table);
1112         } else {
1113                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1114                         NL_SET_BAD_ATTR(extack, attr);
1115                         return -EEXIST;
1116                 }
1117                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1118                         return -EOPNOTSUPP;
1119
1120                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1121
1122                 return nf_tables_updtable(&ctx);
1123         }
1124
1125         if (nla[NFTA_TABLE_FLAGS]) {
1126                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1127                 if (flags & ~NFT_TABLE_F_MASK)
1128                         return -EOPNOTSUPP;
1129         }
1130
1131         err = -ENOMEM;
1132         table = kzalloc(sizeof(*table), GFP_KERNEL);
1133         if (table == NULL)
1134                 goto err_kzalloc;
1135
1136         table->name = nla_strdup(attr, GFP_KERNEL);
1137         if (table->name == NULL)
1138                 goto err_strdup;
1139
1140         if (nla[NFTA_TABLE_USERDATA]) {
1141                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1142                 if (table->udata == NULL)
1143                         goto err_table_udata;
1144
1145                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1146         }
1147
1148         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1149         if (err)
1150                 goto err_chain_ht;
1151
1152         INIT_LIST_HEAD(&table->chains);
1153         INIT_LIST_HEAD(&table->sets);
1154         INIT_LIST_HEAD(&table->objects);
1155         INIT_LIST_HEAD(&table->flowtables);
1156         table->family = family;
1157         table->flags = flags;
1158         table->handle = ++nft_net->table_handle;
1159         if (table->flags & NFT_TABLE_F_OWNER)
1160                 table->nlpid = NETLINK_CB(skb).portid;
1161
1162         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1163         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1164         if (err < 0)
1165                 goto err_trans;
1166
1167         list_add_tail_rcu(&table->list, &nft_net->tables);
1168         return 0;
1169 err_trans:
1170         rhltable_destroy(&table->chains_ht);
1171 err_chain_ht:
1172         kfree(table->udata);
1173 err_table_udata:
1174         kfree(table->name);
1175 err_strdup:
1176         kfree(table);
1177 err_kzalloc:
1178         return err;
1179 }
1180
1181 static int nft_flush_table(struct nft_ctx *ctx)
1182 {
1183         struct nft_flowtable *flowtable, *nft;
1184         struct nft_chain *chain, *nc;
1185         struct nft_object *obj, *ne;
1186         struct nft_set *set, *ns;
1187         int err;
1188
1189         list_for_each_entry(chain, &ctx->table->chains, list) {
1190                 if (!nft_is_active_next(ctx->net, chain))
1191                         continue;
1192
1193                 if (nft_chain_is_bound(chain))
1194                         continue;
1195
1196                 ctx->chain = chain;
1197
1198                 err = nft_delrule_by_chain(ctx);
1199                 if (err < 0)
1200                         goto out;
1201         }
1202
1203         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1204                 if (!nft_is_active_next(ctx->net, set))
1205                         continue;
1206
1207                 if (nft_set_is_anonymous(set) &&
1208                     !list_empty(&set->bindings))
1209                         continue;
1210
1211                 err = nft_delset(ctx, set);
1212                 if (err < 0)
1213                         goto out;
1214         }
1215
1216         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1217                 if (!nft_is_active_next(ctx->net, flowtable))
1218                         continue;
1219
1220                 err = nft_delflowtable(ctx, flowtable);
1221                 if (err < 0)
1222                         goto out;
1223         }
1224
1225         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1226                 if (!nft_is_active_next(ctx->net, obj))
1227                         continue;
1228
1229                 err = nft_delobj(ctx, obj);
1230                 if (err < 0)
1231                         goto out;
1232         }
1233
1234         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1235                 if (!nft_is_active_next(ctx->net, chain))
1236                         continue;
1237
1238                 if (nft_chain_is_bound(chain))
1239                         continue;
1240
1241                 ctx->chain = chain;
1242
1243                 err = nft_delchain(ctx);
1244                 if (err < 0)
1245                         goto out;
1246         }
1247
1248         err = nft_deltable(ctx);
1249 out:
1250         return err;
1251 }
1252
1253 static int nft_flush(struct nft_ctx *ctx, int family)
1254 {
1255         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1256         const struct nlattr * const *nla = ctx->nla;
1257         struct nft_table *table, *nt;
1258         int err = 0;
1259
1260         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1261                 if (family != AF_UNSPEC && table->family != family)
1262                         continue;
1263
1264                 ctx->family = table->family;
1265
1266                 if (!nft_is_active_next(ctx->net, table))
1267                         continue;
1268
1269                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1270                         continue;
1271
1272                 if (nla[NFTA_TABLE_NAME] &&
1273                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1274                         continue;
1275
1276                 ctx->table = table;
1277
1278                 err = nft_flush_table(ctx);
1279                 if (err < 0)
1280                         goto out;
1281         }
1282 out:
1283         return err;
1284 }
1285
1286 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1287                               const struct nlattr * const nla[])
1288 {
1289         struct netlink_ext_ack *extack = info->extack;
1290         u8 genmask = nft_genmask_next(info->net);
1291         u8 family = info->nfmsg->nfgen_family;
1292         struct net *net = info->net;
1293         const struct nlattr *attr;
1294         struct nft_table *table;
1295         struct nft_ctx ctx;
1296
1297         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1298         if (family == AF_UNSPEC ||
1299             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1300                 return nft_flush(&ctx, family);
1301
1302         if (nla[NFTA_TABLE_HANDLE]) {
1303                 attr = nla[NFTA_TABLE_HANDLE];
1304                 table = nft_table_lookup_byhandle(net, attr, genmask,
1305                                                   NETLINK_CB(skb).portid);
1306         } else {
1307                 attr = nla[NFTA_TABLE_NAME];
1308                 table = nft_table_lookup(net, attr, family, genmask,
1309                                          NETLINK_CB(skb).portid);
1310         }
1311
1312         if (IS_ERR(table)) {
1313                 NL_SET_BAD_ATTR(extack, attr);
1314                 return PTR_ERR(table);
1315         }
1316
1317         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1318             table->use > 0)
1319                 return -EBUSY;
1320
1321         ctx.family = family;
1322         ctx.table = table;
1323
1324         return nft_flush_table(&ctx);
1325 }
1326
1327 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1328 {
1329         if (WARN_ON(ctx->table->use > 0))
1330                 return;
1331
1332         rhltable_destroy(&ctx->table->chains_ht);
1333         kfree(ctx->table->name);
1334         kfree(ctx->table->udata);
1335         kfree(ctx->table);
1336 }
1337
1338 void nft_register_chain_type(const struct nft_chain_type *ctype)
1339 {
1340         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1341         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1342                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1343                 return;
1344         }
1345         chain_type[ctype->family][ctype->type] = ctype;
1346         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1347 }
1348 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1349
1350 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1351 {
1352         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1353         chain_type[ctype->family][ctype->type] = NULL;
1354         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1355 }
1356 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1357
1358 /*
1359  * Chains
1360  */
1361
1362 static struct nft_chain *
1363 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1364 {
1365         struct nft_chain *chain;
1366
1367         list_for_each_entry(chain, &table->chains, list) {
1368                 if (chain->handle == handle &&
1369                     nft_active_genmask(chain, genmask))
1370                         return chain;
1371         }
1372
1373         return ERR_PTR(-ENOENT);
1374 }
1375
1376 static bool lockdep_commit_lock_is_held(const struct net *net)
1377 {
1378 #ifdef CONFIG_PROVE_LOCKING
1379         struct nftables_pernet *nft_net = nft_pernet(net);
1380
1381         return lockdep_is_held(&nft_net->commit_mutex);
1382 #else
1383         return true;
1384 #endif
1385 }
1386
1387 static struct nft_chain *nft_chain_lookup(struct net *net,
1388                                           struct nft_table *table,
1389                                           const struct nlattr *nla, u8 genmask)
1390 {
1391         char search[NFT_CHAIN_MAXNAMELEN + 1];
1392         struct rhlist_head *tmp, *list;
1393         struct nft_chain *chain;
1394
1395         if (nla == NULL)
1396                 return ERR_PTR(-EINVAL);
1397
1398         nla_strscpy(search, nla, sizeof(search));
1399
1400         WARN_ON(!rcu_read_lock_held() &&
1401                 !lockdep_commit_lock_is_held(net));
1402
1403         chain = ERR_PTR(-ENOENT);
1404         rcu_read_lock();
1405         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1406         if (!list)
1407                 goto out_unlock;
1408
1409         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1410                 if (nft_active_genmask(chain, genmask))
1411                         goto out_unlock;
1412         }
1413         chain = ERR_PTR(-ENOENT);
1414 out_unlock:
1415         rcu_read_unlock();
1416         return chain;
1417 }
1418
1419 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1420         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1421                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1422         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1423         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1424                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1425         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1426         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1427         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1428                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1429         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1430         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1431         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1432         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1433                                     .len = NFT_USERDATA_MAXLEN },
1434 };
1435
1436 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1437         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1438         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1439         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1440                                     .len = IFNAMSIZ - 1 },
1441 };
1442
1443 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1444 {
1445         struct nft_stats *cpu_stats, total;
1446         struct nlattr *nest;
1447         unsigned int seq;
1448         u64 pkts, bytes;
1449         int cpu;
1450
1451         if (!stats)
1452                 return 0;
1453
1454         memset(&total, 0, sizeof(total));
1455         for_each_possible_cpu(cpu) {
1456                 cpu_stats = per_cpu_ptr(stats, cpu);
1457                 do {
1458                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1459                         pkts = cpu_stats->pkts;
1460                         bytes = cpu_stats->bytes;
1461                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1462                 total.pkts += pkts;
1463                 total.bytes += bytes;
1464         }
1465         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1466         if (nest == NULL)
1467                 goto nla_put_failure;
1468
1469         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1470                          NFTA_COUNTER_PAD) ||
1471             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1472                          NFTA_COUNTER_PAD))
1473                 goto nla_put_failure;
1474
1475         nla_nest_end(skb, nest);
1476         return 0;
1477
1478 nla_put_failure:
1479         return -ENOSPC;
1480 }
1481
1482 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1483                                    const struct nft_base_chain *basechain)
1484 {
1485         const struct nf_hook_ops *ops = &basechain->ops;
1486         struct nft_hook *hook, *first = NULL;
1487         struct nlattr *nest, *nest_devs;
1488         int n = 0;
1489
1490         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1491         if (nest == NULL)
1492                 goto nla_put_failure;
1493         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1494                 goto nla_put_failure;
1495         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1496                 goto nla_put_failure;
1497
1498         if (nft_base_chain_netdev(family, ops->hooknum)) {
1499                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1500                 list_for_each_entry(hook, &basechain->hook_list, list) {
1501                         if (!first)
1502                                 first = hook;
1503
1504                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1505                                            hook->ops.dev->name))
1506                                 goto nla_put_failure;
1507                         n++;
1508                 }
1509                 nla_nest_end(skb, nest_devs);
1510
1511                 if (n == 1 &&
1512                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1513                         goto nla_put_failure;
1514         }
1515         nla_nest_end(skb, nest);
1516
1517         return 0;
1518 nla_put_failure:
1519         return -1;
1520 }
1521
1522 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1523                                      u32 portid, u32 seq, int event, u32 flags,
1524                                      int family, const struct nft_table *table,
1525                                      const struct nft_chain *chain)
1526 {
1527         struct nlmsghdr *nlh;
1528
1529         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1530         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1531                            NFNETLINK_V0, nft_base_seq(net));
1532         if (!nlh)
1533                 goto nla_put_failure;
1534
1535         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1536                 goto nla_put_failure;
1537         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1538                          NFTA_CHAIN_PAD))
1539                 goto nla_put_failure;
1540         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1541                 goto nla_put_failure;
1542
1543         if (nft_is_base_chain(chain)) {
1544                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1545                 struct nft_stats __percpu *stats;
1546
1547                 if (nft_dump_basechain_hook(skb, family, basechain))
1548                         goto nla_put_failure;
1549
1550                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1551                                  htonl(basechain->policy)))
1552                         goto nla_put_failure;
1553
1554                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1555                         goto nla_put_failure;
1556
1557                 stats = rcu_dereference_check(basechain->stats,
1558                                               lockdep_commit_lock_is_held(net));
1559                 if (nft_dump_stats(skb, stats))
1560                         goto nla_put_failure;
1561         }
1562
1563         if (chain->flags &&
1564             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1565                 goto nla_put_failure;
1566
1567         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1568                 goto nla_put_failure;
1569
1570         if (chain->udata &&
1571             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1572                 goto nla_put_failure;
1573
1574         nlmsg_end(skb, nlh);
1575         return 0;
1576
1577 nla_put_failure:
1578         nlmsg_trim(skb, nlh);
1579         return -1;
1580 }
1581
1582 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1583 {
1584         struct nftables_pernet *nft_net;
1585         struct sk_buff *skb;
1586         u16 flags = 0;
1587         int err;
1588
1589         if (!ctx->report &&
1590             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1591                 return;
1592
1593         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1594         if (skb == NULL)
1595                 goto err;
1596
1597         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1598                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1599
1600         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1601                                         event, flags, ctx->family, ctx->table,
1602                                         ctx->chain);
1603         if (err < 0) {
1604                 kfree_skb(skb);
1605                 goto err;
1606         }
1607
1608         nft_net = nft_pernet(ctx->net);
1609         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1610         return;
1611 err:
1612         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1613 }
1614
1615 static int nf_tables_dump_chains(struct sk_buff *skb,
1616                                  struct netlink_callback *cb)
1617 {
1618         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1619         unsigned int idx = 0, s_idx = cb->args[0];
1620         struct net *net = sock_net(skb->sk);
1621         int family = nfmsg->nfgen_family;
1622         struct nftables_pernet *nft_net;
1623         const struct nft_table *table;
1624         const struct nft_chain *chain;
1625
1626         rcu_read_lock();
1627         nft_net = nft_pernet(net);
1628         cb->seq = READ_ONCE(nft_net->base_seq);
1629
1630         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1631                 if (family != NFPROTO_UNSPEC && family != table->family)
1632                         continue;
1633
1634                 list_for_each_entry_rcu(chain, &table->chains, list) {
1635                         if (idx < s_idx)
1636                                 goto cont;
1637                         if (idx > s_idx)
1638                                 memset(&cb->args[1], 0,
1639                                        sizeof(cb->args) - sizeof(cb->args[0]));
1640                         if (!nft_is_active(net, chain))
1641                                 continue;
1642                         if (nf_tables_fill_chain_info(skb, net,
1643                                                       NETLINK_CB(cb->skb).portid,
1644                                                       cb->nlh->nlmsg_seq,
1645                                                       NFT_MSG_NEWCHAIN,
1646                                                       NLM_F_MULTI,
1647                                                       table->family, table,
1648                                                       chain) < 0)
1649                                 goto done;
1650
1651                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1652 cont:
1653                         idx++;
1654                 }
1655         }
1656 done:
1657         rcu_read_unlock();
1658         cb->args[0] = idx;
1659         return skb->len;
1660 }
1661
1662 /* called with rcu_read_lock held */
1663 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1664                               const struct nlattr * const nla[])
1665 {
1666         struct netlink_ext_ack *extack = info->extack;
1667         u8 genmask = nft_genmask_cur(info->net);
1668         u8 family = info->nfmsg->nfgen_family;
1669         const struct nft_chain *chain;
1670         struct net *net = info->net;
1671         struct nft_table *table;
1672         struct sk_buff *skb2;
1673         int err;
1674
1675         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1676                 struct netlink_dump_control c = {
1677                         .dump = nf_tables_dump_chains,
1678                         .module = THIS_MODULE,
1679                 };
1680
1681                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1682         }
1683
1684         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1685         if (IS_ERR(table)) {
1686                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1687                 return PTR_ERR(table);
1688         }
1689
1690         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1691         if (IS_ERR(chain)) {
1692                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1693                 return PTR_ERR(chain);
1694         }
1695
1696         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1697         if (!skb2)
1698                 return -ENOMEM;
1699
1700         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1701                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1702                                         0, family, table, chain);
1703         if (err < 0)
1704                 goto err_fill_chain_info;
1705
1706         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1707
1708 err_fill_chain_info:
1709         kfree_skb(skb2);
1710         return err;
1711 }
1712
1713 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1714         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1715         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1716 };
1717
1718 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1719 {
1720         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1721         struct nft_stats __percpu *newstats;
1722         struct nft_stats *stats;
1723         int err;
1724
1725         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1726                                           nft_counter_policy, NULL);
1727         if (err < 0)
1728                 return ERR_PTR(err);
1729
1730         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1731                 return ERR_PTR(-EINVAL);
1732
1733         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1734         if (newstats == NULL)
1735                 return ERR_PTR(-ENOMEM);
1736
1737         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1738          * are not exposed to userspace.
1739          */
1740         preempt_disable();
1741         stats = this_cpu_ptr(newstats);
1742         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1743         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1744         preempt_enable();
1745
1746         return newstats;
1747 }
1748
1749 static void nft_chain_stats_replace(struct nft_trans *trans)
1750 {
1751         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1752
1753         if (!nft_trans_chain_stats(trans))
1754                 return;
1755
1756         nft_trans_chain_stats(trans) =
1757                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1758                                     lockdep_commit_lock_is_held(trans->ctx.net));
1759
1760         if (!nft_trans_chain_stats(trans))
1761                 static_branch_inc(&nft_counters_enabled);
1762 }
1763
1764 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1765 {
1766         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1767         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1768
1769         if (g0 != g1)
1770                 kvfree(g1);
1771         kvfree(g0);
1772
1773         /* should be NULL either via abort or via successful commit */
1774         WARN_ON_ONCE(chain->rules_next);
1775         kvfree(chain->rules_next);
1776 }
1777
1778 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1779 {
1780         struct nft_chain *chain = ctx->chain;
1781         struct nft_hook *hook, *next;
1782
1783         if (WARN_ON(chain->use > 0))
1784                 return;
1785
1786         /* no concurrent access possible anymore */
1787         nf_tables_chain_free_chain_rules(chain);
1788
1789         if (nft_is_base_chain(chain)) {
1790                 struct nft_base_chain *basechain = nft_base_chain(chain);
1791
1792                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1793                         list_for_each_entry_safe(hook, next,
1794                                                  &basechain->hook_list, list) {
1795                                 list_del_rcu(&hook->list);
1796                                 kfree_rcu(hook, rcu);
1797                         }
1798                 }
1799                 module_put(basechain->type->owner);
1800                 if (rcu_access_pointer(basechain->stats)) {
1801                         static_branch_dec(&nft_counters_enabled);
1802                         free_percpu(rcu_dereference_raw(basechain->stats));
1803                 }
1804                 kfree(chain->name);
1805                 kfree(chain->udata);
1806                 kfree(basechain);
1807         } else {
1808                 kfree(chain->name);
1809                 kfree(chain->udata);
1810                 kfree(chain);
1811         }
1812 }
1813
1814 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1815                                               const struct nlattr *attr)
1816 {
1817         struct net_device *dev;
1818         char ifname[IFNAMSIZ];
1819         struct nft_hook *hook;
1820         int err;
1821
1822         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1823         if (!hook) {
1824                 err = -ENOMEM;
1825                 goto err_hook_alloc;
1826         }
1827
1828         nla_strscpy(ifname, attr, IFNAMSIZ);
1829         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1830          * indirectly serializing all the other holders of the commit_mutex with
1831          * the rtnl_mutex.
1832          */
1833         dev = __dev_get_by_name(net, ifname);
1834         if (!dev) {
1835                 err = -ENOENT;
1836                 goto err_hook_dev;
1837         }
1838         hook->ops.dev = dev;
1839
1840         return hook;
1841
1842 err_hook_dev:
1843         kfree(hook);
1844 err_hook_alloc:
1845         return ERR_PTR(err);
1846 }
1847
1848 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1849                                            const struct nft_hook *this)
1850 {
1851         struct nft_hook *hook;
1852
1853         list_for_each_entry(hook, hook_list, list) {
1854                 if (this->ops.dev == hook->ops.dev)
1855                         return hook;
1856         }
1857
1858         return NULL;
1859 }
1860
1861 static int nf_tables_parse_netdev_hooks(struct net *net,
1862                                         const struct nlattr *attr,
1863                                         struct list_head *hook_list)
1864 {
1865         struct nft_hook *hook, *next;
1866         const struct nlattr *tmp;
1867         int rem, n = 0, err;
1868
1869         nla_for_each_nested(tmp, attr, rem) {
1870                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1871                         err = -EINVAL;
1872                         goto err_hook;
1873                 }
1874
1875                 hook = nft_netdev_hook_alloc(net, tmp);
1876                 if (IS_ERR(hook)) {
1877                         err = PTR_ERR(hook);
1878                         goto err_hook;
1879                 }
1880                 if (nft_hook_list_find(hook_list, hook)) {
1881                         kfree(hook);
1882                         err = -EEXIST;
1883                         goto err_hook;
1884                 }
1885                 list_add_tail(&hook->list, hook_list);
1886                 n++;
1887
1888                 if (n == NFT_NETDEVICE_MAX) {
1889                         err = -EFBIG;
1890                         goto err_hook;
1891                 }
1892         }
1893
1894         return 0;
1895
1896 err_hook:
1897         list_for_each_entry_safe(hook, next, hook_list, list) {
1898                 list_del(&hook->list);
1899                 kfree(hook);
1900         }
1901         return err;
1902 }
1903
1904 struct nft_chain_hook {
1905         u32                             num;
1906         s32                             priority;
1907         const struct nft_chain_type     *type;
1908         struct list_head                list;
1909 };
1910
1911 static int nft_chain_parse_netdev(struct net *net,
1912                                   struct nlattr *tb[],
1913                                   struct list_head *hook_list)
1914 {
1915         struct nft_hook *hook;
1916         int err;
1917
1918         if (tb[NFTA_HOOK_DEV]) {
1919                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1920                 if (IS_ERR(hook))
1921                         return PTR_ERR(hook);
1922
1923                 list_add_tail(&hook->list, hook_list);
1924         } else if (tb[NFTA_HOOK_DEVS]) {
1925                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1926                                                    hook_list);
1927                 if (err < 0)
1928                         return err;
1929
1930                 if (list_empty(hook_list))
1931                         return -EINVAL;
1932         } else {
1933                 return -EINVAL;
1934         }
1935
1936         return 0;
1937 }
1938
1939 static int nft_chain_parse_hook(struct net *net,
1940                                 const struct nlattr * const nla[],
1941                                 struct nft_chain_hook *hook, u8 family,
1942                                 struct netlink_ext_ack *extack, bool autoload)
1943 {
1944         struct nftables_pernet *nft_net = nft_pernet(net);
1945         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1946         const struct nft_chain_type *type;
1947         int err;
1948
1949         lockdep_assert_held(&nft_net->commit_mutex);
1950         lockdep_nfnl_nft_mutex_not_held();
1951
1952         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1953                                           nla[NFTA_CHAIN_HOOK],
1954                                           nft_hook_policy, NULL);
1955         if (err < 0)
1956                 return err;
1957
1958         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1959             ha[NFTA_HOOK_PRIORITY] == NULL)
1960                 return -EINVAL;
1961
1962         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1963         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1964
1965         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1966         if (!type)
1967                 return -EOPNOTSUPP;
1968
1969         if (nla[NFTA_CHAIN_TYPE]) {
1970                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1971                                                    family, autoload);
1972                 if (IS_ERR(type)) {
1973                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1974                         return PTR_ERR(type);
1975                 }
1976         }
1977         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1978                 return -EOPNOTSUPP;
1979
1980         if (type->type == NFT_CHAIN_T_NAT &&
1981             hook->priority <= NF_IP_PRI_CONNTRACK)
1982                 return -EOPNOTSUPP;
1983
1984         if (!try_module_get(type->owner)) {
1985                 if (nla[NFTA_CHAIN_TYPE])
1986                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1987                 return -ENOENT;
1988         }
1989
1990         hook->type = type;
1991
1992         INIT_LIST_HEAD(&hook->list);
1993         if (nft_base_chain_netdev(family, hook->num)) {
1994                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1995                 if (err < 0) {
1996                         module_put(type->owner);
1997                         return err;
1998                 }
1999         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2000                 module_put(type->owner);
2001                 return -EOPNOTSUPP;
2002         }
2003
2004         return 0;
2005 }
2006
2007 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2008 {
2009         struct nft_hook *h, *next;
2010
2011         list_for_each_entry_safe(h, next, &hook->list, list) {
2012                 list_del(&h->list);
2013                 kfree(h);
2014         }
2015         module_put(hook->type->owner);
2016 }
2017
2018 struct nft_rules_old {
2019         struct rcu_head h;
2020         struct nft_rule **start;
2021 };
2022
2023 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2024                                                      unsigned int alloc)
2025 {
2026         if (alloc > INT_MAX)
2027                 return NULL;
2028
2029         alloc += 1;     /* NULL, ends rules */
2030         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
2031                 return NULL;
2032
2033         alloc *= sizeof(struct nft_rule *);
2034         alloc += sizeof(struct nft_rules_old);
2035
2036         return kvmalloc(alloc, GFP_KERNEL);
2037 }
2038
2039 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2040                                     const struct nft_chain_hook *hook,
2041                                     struct nft_chain *chain)
2042 {
2043         ops->pf                 = family;
2044         ops->hooknum            = hook->num;
2045         ops->priority           = hook->priority;
2046         ops->priv               = chain;
2047         ops->hook               = hook->type->hooks[ops->hooknum];
2048         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2049 }
2050
2051 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2052                               struct nft_chain_hook *hook, u32 flags)
2053 {
2054         struct nft_chain *chain;
2055         struct nft_hook *h;
2056
2057         basechain->type = hook->type;
2058         INIT_LIST_HEAD(&basechain->hook_list);
2059         chain = &basechain->chain;
2060
2061         if (nft_base_chain_netdev(family, hook->num)) {
2062                 list_splice_init(&hook->list, &basechain->hook_list);
2063                 list_for_each_entry(h, &basechain->hook_list, list)
2064                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2065
2066                 basechain->ops.hooknum  = hook->num;
2067                 basechain->ops.priority = hook->priority;
2068         } else {
2069                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2070         }
2071
2072         chain->flags |= NFT_CHAIN_BASE | flags;
2073         basechain->policy = NF_ACCEPT;
2074         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2075             !nft_chain_offload_support(basechain)) {
2076                 list_splice_init(&basechain->hook_list, &hook->list);
2077                 return -EOPNOTSUPP;
2078         }
2079
2080         flow_block_init(&basechain->flow_block);
2081
2082         return 0;
2083 }
2084
2085 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2086 {
2087         int err;
2088
2089         err = rhltable_insert_key(&table->chains_ht, chain->name,
2090                                   &chain->rhlhead, nft_chain_ht_params);
2091         if (err)
2092                 return err;
2093
2094         list_add_tail_rcu(&chain->list, &table->chains);
2095
2096         return 0;
2097 }
2098
2099 static u64 chain_id;
2100
2101 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2102                               u8 policy, u32 flags,
2103                               struct netlink_ext_ack *extack)
2104 {
2105         const struct nlattr * const *nla = ctx->nla;
2106         struct nft_stats __percpu *stats = NULL;
2107         struct nft_table *table = ctx->table;
2108         struct nft_base_chain *basechain;
2109         struct net *net = ctx->net;
2110         char name[NFT_NAME_MAXLEN];
2111         struct nft_trans *trans;
2112         struct nft_chain *chain;
2113         struct nft_rule **rules;
2114         int err;
2115
2116         if (table->use == UINT_MAX)
2117                 return -EOVERFLOW;
2118
2119         if (nla[NFTA_CHAIN_HOOK]) {
2120                 struct nft_chain_hook hook;
2121
2122                 if (flags & NFT_CHAIN_BINDING)
2123                         return -EOPNOTSUPP;
2124
2125                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2126                                            true);
2127                 if (err < 0)
2128                         return err;
2129
2130                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2131                 if (basechain == NULL) {
2132                         nft_chain_release_hook(&hook);
2133                         return -ENOMEM;
2134                 }
2135                 chain = &basechain->chain;
2136
2137                 if (nla[NFTA_CHAIN_COUNTERS]) {
2138                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2139                         if (IS_ERR(stats)) {
2140                                 nft_chain_release_hook(&hook);
2141                                 kfree(basechain);
2142                                 return PTR_ERR(stats);
2143                         }
2144                         rcu_assign_pointer(basechain->stats, stats);
2145                 }
2146
2147                 err = nft_basechain_init(basechain, family, &hook, flags);
2148                 if (err < 0) {
2149                         nft_chain_release_hook(&hook);
2150                         kfree(basechain);
2151                         return err;
2152                 }
2153         } else {
2154                 if (flags & NFT_CHAIN_BASE)
2155                         return -EINVAL;
2156                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2157                         return -EOPNOTSUPP;
2158
2159                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2160                 if (chain == NULL)
2161                         return -ENOMEM;
2162
2163                 chain->flags = flags;
2164         }
2165         ctx->chain = chain;
2166
2167         INIT_LIST_HEAD(&chain->rules);
2168         chain->handle = nf_tables_alloc_handle(table);
2169         chain->table = table;
2170
2171         if (nla[NFTA_CHAIN_NAME]) {
2172                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2173         } else {
2174                 if (!(flags & NFT_CHAIN_BINDING)) {
2175                         err = -EINVAL;
2176                         goto err_destroy_chain;
2177                 }
2178
2179                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2180                 chain->name = kstrdup(name, GFP_KERNEL);
2181         }
2182
2183         if (!chain->name) {
2184                 err = -ENOMEM;
2185                 goto err_destroy_chain;
2186         }
2187
2188         if (nla[NFTA_CHAIN_USERDATA]) {
2189                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2190                 if (chain->udata == NULL) {
2191                         err = -ENOMEM;
2192                         goto err_destroy_chain;
2193                 }
2194                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2195         }
2196
2197         rules = nf_tables_chain_alloc_rules(chain, 0);
2198         if (!rules) {
2199                 err = -ENOMEM;
2200                 goto err_destroy_chain;
2201         }
2202
2203         *rules = NULL;
2204         rcu_assign_pointer(chain->rules_gen_0, rules);
2205         rcu_assign_pointer(chain->rules_gen_1, rules);
2206
2207         err = nf_tables_register_hook(net, table, chain);
2208         if (err < 0)
2209                 goto err_destroy_chain;
2210
2211         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2212         if (IS_ERR(trans)) {
2213                 err = PTR_ERR(trans);
2214                 goto err_unregister_hook;
2215         }
2216
2217         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2218         if (nft_is_base_chain(chain))
2219                 nft_trans_chain_policy(trans) = policy;
2220
2221         err = nft_chain_add(table, chain);
2222         if (err < 0) {
2223                 nft_trans_destroy(trans);
2224                 goto err_unregister_hook;
2225         }
2226
2227         if (stats)
2228                 static_branch_inc(&nft_counters_enabled);
2229
2230         table->use++;
2231
2232         return 0;
2233 err_unregister_hook:
2234         nf_tables_unregister_hook(net, table, chain);
2235 err_destroy_chain:
2236         nf_tables_chain_destroy(ctx);
2237
2238         return err;
2239 }
2240
2241 static bool nft_hook_list_equal(struct list_head *hook_list1,
2242                                 struct list_head *hook_list2)
2243 {
2244         struct nft_hook *hook;
2245         int n = 0, m = 0;
2246
2247         n = 0;
2248         list_for_each_entry(hook, hook_list2, list) {
2249                 if (!nft_hook_list_find(hook_list1, hook))
2250                         return false;
2251
2252                 n++;
2253         }
2254         list_for_each_entry(hook, hook_list1, list)
2255                 m++;
2256
2257         return n == m;
2258 }
2259
2260 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2261                               u32 flags, const struct nlattr *attr,
2262                               struct netlink_ext_ack *extack)
2263 {
2264         const struct nlattr * const *nla = ctx->nla;
2265         struct nft_table *table = ctx->table;
2266         struct nft_chain *chain = ctx->chain;
2267         struct nft_base_chain *basechain;
2268         struct nft_stats *stats = NULL;
2269         struct nft_chain_hook hook;
2270         struct nf_hook_ops *ops;
2271         struct nft_trans *trans;
2272         int err;
2273
2274         if (chain->flags ^ flags)
2275                 return -EOPNOTSUPP;
2276
2277         if (nla[NFTA_CHAIN_HOOK]) {
2278                 if (!nft_is_base_chain(chain)) {
2279                         NL_SET_BAD_ATTR(extack, attr);
2280                         return -EEXIST;
2281                 }
2282                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2283                                            extack, false);
2284                 if (err < 0)
2285                         return err;
2286
2287                 basechain = nft_base_chain(chain);
2288                 if (basechain->type != hook.type) {
2289                         nft_chain_release_hook(&hook);
2290                         NL_SET_BAD_ATTR(extack, attr);
2291                         return -EEXIST;
2292                 }
2293
2294                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2295                         if (!nft_hook_list_equal(&basechain->hook_list,
2296                                                  &hook.list)) {
2297                                 nft_chain_release_hook(&hook);
2298                                 NL_SET_BAD_ATTR(extack, attr);
2299                                 return -EEXIST;
2300                         }
2301                 } else {
2302                         ops = &basechain->ops;
2303                         if (ops->hooknum != hook.num ||
2304                             ops->priority != hook.priority) {
2305                                 nft_chain_release_hook(&hook);
2306                                 NL_SET_BAD_ATTR(extack, attr);
2307                                 return -EEXIST;
2308                         }
2309                 }
2310                 nft_chain_release_hook(&hook);
2311         }
2312
2313         if (nla[NFTA_CHAIN_HANDLE] &&
2314             nla[NFTA_CHAIN_NAME]) {
2315                 struct nft_chain *chain2;
2316
2317                 chain2 = nft_chain_lookup(ctx->net, table,
2318                                           nla[NFTA_CHAIN_NAME], genmask);
2319                 if (!IS_ERR(chain2)) {
2320                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2321                         return -EEXIST;
2322                 }
2323         }
2324
2325         if (nla[NFTA_CHAIN_COUNTERS]) {
2326                 if (!nft_is_base_chain(chain))
2327                         return -EOPNOTSUPP;
2328
2329                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2330                 if (IS_ERR(stats))
2331                         return PTR_ERR(stats);
2332         }
2333
2334         err = -ENOMEM;
2335         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2336                                 sizeof(struct nft_trans_chain));
2337         if (trans == NULL)
2338                 goto err;
2339
2340         nft_trans_chain_stats(trans) = stats;
2341         nft_trans_chain_update(trans) = true;
2342
2343         if (nla[NFTA_CHAIN_POLICY])
2344                 nft_trans_chain_policy(trans) = policy;
2345         else
2346                 nft_trans_chain_policy(trans) = -1;
2347
2348         if (nla[NFTA_CHAIN_HANDLE] &&
2349             nla[NFTA_CHAIN_NAME]) {
2350                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2351                 struct nft_trans *tmp;
2352                 char *name;
2353
2354                 err = -ENOMEM;
2355                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2356                 if (!name)
2357                         goto err;
2358
2359                 err = -EEXIST;
2360                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2361                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2362                             tmp->ctx.table == table &&
2363                             nft_trans_chain_update(tmp) &&
2364                             nft_trans_chain_name(tmp) &&
2365                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2366                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2367                                 kfree(name);
2368                                 goto err;
2369                         }
2370                 }
2371
2372                 nft_trans_chain_name(trans) = name;
2373         }
2374         nft_trans_commit_list_add_tail(ctx->net, trans);
2375
2376         return 0;
2377 err:
2378         free_percpu(stats);
2379         kfree(trans);
2380         return err;
2381 }
2382
2383 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2384                                                const struct nft_table *table,
2385                                                const struct nlattr *nla)
2386 {
2387         struct nftables_pernet *nft_net = nft_pernet(net);
2388         u32 id = ntohl(nla_get_be32(nla));
2389         struct nft_trans *trans;
2390
2391         list_for_each_entry(trans, &nft_net->commit_list, list) {
2392                 struct nft_chain *chain = trans->ctx.chain;
2393
2394                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2395                     chain->table == table &&
2396                     id == nft_trans_chain_id(trans))
2397                         return chain;
2398         }
2399         return ERR_PTR(-ENOENT);
2400 }
2401
2402 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2403                               const struct nlattr * const nla[])
2404 {
2405         struct nftables_pernet *nft_net = nft_pernet(info->net);
2406         struct netlink_ext_ack *extack = info->extack;
2407         u8 genmask = nft_genmask_next(info->net);
2408         u8 family = info->nfmsg->nfgen_family;
2409         struct nft_chain *chain = NULL;
2410         struct net *net = info->net;
2411         const struct nlattr *attr;
2412         struct nft_table *table;
2413         u8 policy = NF_ACCEPT;
2414         struct nft_ctx ctx;
2415         u64 handle = 0;
2416         u32 flags = 0;
2417
2418         lockdep_assert_held(&nft_net->commit_mutex);
2419
2420         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2421                                  NETLINK_CB(skb).portid);
2422         if (IS_ERR(table)) {
2423                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2424                 return PTR_ERR(table);
2425         }
2426
2427         chain = NULL;
2428         attr = nla[NFTA_CHAIN_NAME];
2429
2430         if (nla[NFTA_CHAIN_HANDLE]) {
2431                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2432                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2433                 if (IS_ERR(chain)) {
2434                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2435                         return PTR_ERR(chain);
2436                 }
2437                 attr = nla[NFTA_CHAIN_HANDLE];
2438         } else if (nla[NFTA_CHAIN_NAME]) {
2439                 chain = nft_chain_lookup(net, table, attr, genmask);
2440                 if (IS_ERR(chain)) {
2441                         if (PTR_ERR(chain) != -ENOENT) {
2442                                 NL_SET_BAD_ATTR(extack, attr);
2443                                 return PTR_ERR(chain);
2444                         }
2445                         chain = NULL;
2446                 }
2447         } else if (!nla[NFTA_CHAIN_ID]) {
2448                 return -EINVAL;
2449         }
2450
2451         if (nla[NFTA_CHAIN_POLICY]) {
2452                 if (chain != NULL &&
2453                     !nft_is_base_chain(chain)) {
2454                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2455                         return -EOPNOTSUPP;
2456                 }
2457
2458                 if (chain == NULL &&
2459                     nla[NFTA_CHAIN_HOOK] == NULL) {
2460                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2461                         return -EOPNOTSUPP;
2462                 }
2463
2464                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2465                 switch (policy) {
2466                 case NF_DROP:
2467                 case NF_ACCEPT:
2468                         break;
2469                 default:
2470                         return -EINVAL;
2471                 }
2472         }
2473
2474         if (nla[NFTA_CHAIN_FLAGS])
2475                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2476         else if (chain)
2477                 flags = chain->flags;
2478
2479         if (flags & ~NFT_CHAIN_FLAGS)
2480                 return -EOPNOTSUPP;
2481
2482         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2483
2484         if (chain != NULL) {
2485                 if (chain->flags & NFT_CHAIN_BINDING)
2486                         return -EINVAL;
2487
2488                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2489                         NL_SET_BAD_ATTR(extack, attr);
2490                         return -EEXIST;
2491                 }
2492                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2493                         return -EOPNOTSUPP;
2494
2495                 flags |= chain->flags & NFT_CHAIN_BASE;
2496                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2497                                           extack);
2498         }
2499
2500         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2501 }
2502
2503 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2504                               const struct nlattr * const nla[])
2505 {
2506         struct netlink_ext_ack *extack = info->extack;
2507         u8 genmask = nft_genmask_next(info->net);
2508         u8 family = info->nfmsg->nfgen_family;
2509         struct net *net = info->net;
2510         const struct nlattr *attr;
2511         struct nft_table *table;
2512         struct nft_chain *chain;
2513         struct nft_rule *rule;
2514         struct nft_ctx ctx;
2515         u64 handle;
2516         u32 use;
2517         int err;
2518
2519         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2520                                  NETLINK_CB(skb).portid);
2521         if (IS_ERR(table)) {
2522                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2523                 return PTR_ERR(table);
2524         }
2525
2526         if (nla[NFTA_CHAIN_HANDLE]) {
2527                 attr = nla[NFTA_CHAIN_HANDLE];
2528                 handle = be64_to_cpu(nla_get_be64(attr));
2529                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2530         } else {
2531                 attr = nla[NFTA_CHAIN_NAME];
2532                 chain = nft_chain_lookup(net, table, attr, genmask);
2533         }
2534         if (IS_ERR(chain)) {
2535                 NL_SET_BAD_ATTR(extack, attr);
2536                 return PTR_ERR(chain);
2537         }
2538
2539         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2540             chain->use > 0)
2541                 return -EBUSY;
2542
2543         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2544
2545         use = chain->use;
2546         list_for_each_entry(rule, &chain->rules, list) {
2547                 if (!nft_is_active_next(net, rule))
2548                         continue;
2549                 use--;
2550
2551                 err = nft_delrule(&ctx, rule);
2552                 if (err < 0)
2553                         return err;
2554         }
2555
2556         /* There are rules and elements that are still holding references to us,
2557          * we cannot do a recursive removal in this case.
2558          */
2559         if (use > 0) {
2560                 NL_SET_BAD_ATTR(extack, attr);
2561                 return -EBUSY;
2562         }
2563
2564         return nft_delchain(&ctx);
2565 }
2566
2567 /*
2568  * Expressions
2569  */
2570
2571 /**
2572  *      nft_register_expr - register nf_tables expr type
2573  *      @type: expr type
2574  *
2575  *      Registers the expr type for use with nf_tables. Returns zero on
2576  *      success or a negative errno code otherwise.
2577  */
2578 int nft_register_expr(struct nft_expr_type *type)
2579 {
2580         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2581         if (type->family == NFPROTO_UNSPEC)
2582                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2583         else
2584                 list_add_rcu(&type->list, &nf_tables_expressions);
2585         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2586         return 0;
2587 }
2588 EXPORT_SYMBOL_GPL(nft_register_expr);
2589
2590 /**
2591  *      nft_unregister_expr - unregister nf_tables expr type
2592  *      @type: expr type
2593  *
2594  *      Unregisters the expr typefor use with nf_tables.
2595  */
2596 void nft_unregister_expr(struct nft_expr_type *type)
2597 {
2598         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2599         list_del_rcu(&type->list);
2600         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2601 }
2602 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2603
2604 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2605                                                        struct nlattr *nla)
2606 {
2607         const struct nft_expr_type *type, *candidate = NULL;
2608
2609         list_for_each_entry(type, &nf_tables_expressions, list) {
2610                 if (!nla_strcmp(nla, type->name)) {
2611                         if (!type->family && !candidate)
2612                                 candidate = type;
2613                         else if (type->family == family)
2614                                 candidate = type;
2615                 }
2616         }
2617         return candidate;
2618 }
2619
2620 #ifdef CONFIG_MODULES
2621 static int nft_expr_type_request_module(struct net *net, u8 family,
2622                                         struct nlattr *nla)
2623 {
2624         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2625                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2626                 return -EAGAIN;
2627
2628         return 0;
2629 }
2630 #endif
2631
2632 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2633                                                      u8 family,
2634                                                      struct nlattr *nla)
2635 {
2636         const struct nft_expr_type *type;
2637
2638         if (nla == NULL)
2639                 return ERR_PTR(-EINVAL);
2640
2641         type = __nft_expr_type_get(family, nla);
2642         if (type != NULL && try_module_get(type->owner))
2643                 return type;
2644
2645         lockdep_nfnl_nft_mutex_not_held();
2646 #ifdef CONFIG_MODULES
2647         if (type == NULL) {
2648                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2649                         return ERR_PTR(-EAGAIN);
2650
2651                 if (nft_request_module(net, "nft-expr-%.*s",
2652                                        nla_len(nla),
2653                                        (char *)nla_data(nla)) == -EAGAIN)
2654                         return ERR_PTR(-EAGAIN);
2655         }
2656 #endif
2657         return ERR_PTR(-ENOENT);
2658 }
2659
2660 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2661         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2662                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2663         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2664 };
2665
2666 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2667                                     const struct nft_expr *expr)
2668 {
2669         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2670                 goto nla_put_failure;
2671
2672         if (expr->ops->dump) {
2673                 struct nlattr *data = nla_nest_start_noflag(skb,
2674                                                             NFTA_EXPR_DATA);
2675                 if (data == NULL)
2676                         goto nla_put_failure;
2677                 if (expr->ops->dump(skb, expr) < 0)
2678                         goto nla_put_failure;
2679                 nla_nest_end(skb, data);
2680         }
2681
2682         return skb->len;
2683
2684 nla_put_failure:
2685         return -1;
2686 };
2687
2688 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2689                   const struct nft_expr *expr)
2690 {
2691         struct nlattr *nest;
2692
2693         nest = nla_nest_start_noflag(skb, attr);
2694         if (!nest)
2695                 goto nla_put_failure;
2696         if (nf_tables_fill_expr_info(skb, expr) < 0)
2697                 goto nla_put_failure;
2698         nla_nest_end(skb, nest);
2699         return 0;
2700
2701 nla_put_failure:
2702         return -1;
2703 }
2704
2705 struct nft_expr_info {
2706         const struct nft_expr_ops       *ops;
2707         const struct nlattr             *attr;
2708         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2709 };
2710
2711 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2712                                 const struct nlattr *nla,
2713                                 struct nft_expr_info *info)
2714 {
2715         const struct nft_expr_type *type;
2716         const struct nft_expr_ops *ops;
2717         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2718         int err;
2719
2720         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2721                                           nft_expr_policy, NULL);
2722         if (err < 0)
2723                 return err;
2724
2725         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2726         if (IS_ERR(type))
2727                 return PTR_ERR(type);
2728
2729         if (tb[NFTA_EXPR_DATA]) {
2730                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2731                                                   tb[NFTA_EXPR_DATA],
2732                                                   type->policy, NULL);
2733                 if (err < 0)
2734                         goto err1;
2735         } else
2736                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2737
2738         if (type->select_ops != NULL) {
2739                 ops = type->select_ops(ctx,
2740                                        (const struct nlattr * const *)info->tb);
2741                 if (IS_ERR(ops)) {
2742                         err = PTR_ERR(ops);
2743 #ifdef CONFIG_MODULES
2744                         if (err == -EAGAIN)
2745                                 if (nft_expr_type_request_module(ctx->net,
2746                                                                  ctx->family,
2747                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2748                                         err = -ENOENT;
2749 #endif
2750                         goto err1;
2751                 }
2752         } else
2753                 ops = type->ops;
2754
2755         info->attr = nla;
2756         info->ops = ops;
2757
2758         return 0;
2759
2760 err1:
2761         module_put(type->owner);
2762         return err;
2763 }
2764
2765 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2766                              const struct nft_expr_info *expr_info,
2767                              struct nft_expr *expr)
2768 {
2769         const struct nft_expr_ops *ops = expr_info->ops;
2770         int err;
2771
2772         expr->ops = ops;
2773         if (ops->init) {
2774                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2775                 if (err < 0)
2776                         goto err1;
2777         }
2778
2779         return 0;
2780 err1:
2781         expr->ops = NULL;
2782         return err;
2783 }
2784
2785 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2786                                    struct nft_expr *expr)
2787 {
2788         const struct nft_expr_type *type = expr->ops->type;
2789
2790         if (expr->ops->destroy)
2791                 expr->ops->destroy(ctx, expr);
2792         module_put(type->owner);
2793 }
2794
2795 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2796                                       const struct nlattr *nla)
2797 {
2798         struct nft_expr_info expr_info;
2799         struct nft_expr *expr;
2800         struct module *owner;
2801         int err;
2802
2803         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2804         if (err < 0)
2805                 goto err_expr_parse;
2806
2807         err = -EOPNOTSUPP;
2808         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2809                 goto err_expr_stateful;
2810
2811         err = -ENOMEM;
2812         expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2813         if (expr == NULL)
2814                 goto err_expr_stateful;
2815
2816         err = nf_tables_newexpr(ctx, &expr_info, expr);
2817         if (err < 0)
2818                 goto err_expr_new;
2819
2820         return expr;
2821 err_expr_new:
2822         kfree(expr);
2823 err_expr_stateful:
2824         owner = expr_info.ops->type->owner;
2825         if (expr_info.ops->type->release_ops)
2826                 expr_info.ops->type->release_ops(expr_info.ops);
2827
2828         module_put(owner);
2829 err_expr_parse:
2830         return ERR_PTR(err);
2831 }
2832
2833 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2834 {
2835         int err;
2836
2837         if (src->ops->clone) {
2838                 dst->ops = src->ops;
2839                 err = src->ops->clone(dst, src);
2840                 if (err < 0)
2841                         return err;
2842         } else {
2843                 memcpy(dst, src, src->ops->size);
2844         }
2845
2846         __module_get(src->ops->type->owner);
2847
2848         return 0;
2849 }
2850
2851 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2852 {
2853         nf_tables_expr_destroy(ctx, expr);
2854         kfree(expr);
2855 }
2856
2857 /*
2858  * Rules
2859  */
2860
2861 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2862                                           u64 handle)
2863 {
2864         struct nft_rule *rule;
2865
2866         // FIXME: this sucks
2867         list_for_each_entry_rcu(rule, &chain->rules, list) {
2868                 if (handle == rule->handle)
2869                         return rule;
2870         }
2871
2872         return ERR_PTR(-ENOENT);
2873 }
2874
2875 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2876                                         const struct nlattr *nla)
2877 {
2878         if (nla == NULL)
2879                 return ERR_PTR(-EINVAL);
2880
2881         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2882 }
2883
2884 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2885         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2886                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2887         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2888                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2889         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2890         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2891         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2892         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2893         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2894                                     .len = NFT_USERDATA_MAXLEN },
2895         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2896         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2897         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2898 };
2899
2900 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2901                                     u32 portid, u32 seq, int event,
2902                                     u32 flags, int family,
2903                                     const struct nft_table *table,
2904                                     const struct nft_chain *chain,
2905                                     const struct nft_rule *rule, u64 handle)
2906 {
2907         struct nlmsghdr *nlh;
2908         const struct nft_expr *expr, *next;
2909         struct nlattr *list;
2910         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2911
2912         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2913                            nft_base_seq(net));
2914         if (!nlh)
2915                 goto nla_put_failure;
2916
2917         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2918                 goto nla_put_failure;
2919         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2920                 goto nla_put_failure;
2921         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2922                          NFTA_RULE_PAD))
2923                 goto nla_put_failure;
2924
2925         if (event != NFT_MSG_DELRULE && handle) {
2926                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
2927                                  NFTA_RULE_PAD))
2928                         goto nla_put_failure;
2929         }
2930
2931         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2932                 nft_flow_rule_stats(chain, rule);
2933
2934         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2935         if (list == NULL)
2936                 goto nla_put_failure;
2937         nft_rule_for_each_expr(expr, next, rule) {
2938                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2939                         goto nla_put_failure;
2940         }
2941         nla_nest_end(skb, list);
2942
2943         if (rule->udata) {
2944                 struct nft_userdata *udata = nft_userdata(rule);
2945                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2946                             udata->data) < 0)
2947                         goto nla_put_failure;
2948         }
2949
2950         nlmsg_end(skb, nlh);
2951         return 0;
2952
2953 nla_put_failure:
2954         nlmsg_trim(skb, nlh);
2955         return -1;
2956 }
2957
2958 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2959                                   const struct nft_rule *rule, int event)
2960 {
2961         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2962         const struct nft_rule *prule;
2963         struct sk_buff *skb;
2964         u64 handle = 0;
2965         u16 flags = 0;
2966         int err;
2967
2968         if (!ctx->report &&
2969             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2970                 return;
2971
2972         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2973         if (skb == NULL)
2974                 goto err;
2975
2976         if (event == NFT_MSG_NEWRULE &&
2977             !list_is_first(&rule->list, &ctx->chain->rules) &&
2978             !list_is_last(&rule->list, &ctx->chain->rules)) {
2979                 prule = list_prev_entry(rule, list);
2980                 handle = prule->handle;
2981         }
2982         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
2983                 flags |= NLM_F_APPEND;
2984         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
2985                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
2986
2987         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2988                                        event, flags, ctx->family, ctx->table,
2989                                        ctx->chain, rule, handle);
2990         if (err < 0) {
2991                 kfree_skb(skb);
2992                 goto err;
2993         }
2994
2995         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
2996         return;
2997 err:
2998         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2999 }
3000
3001 struct nft_rule_dump_ctx {
3002         char *table;
3003         char *chain;
3004 };
3005
3006 static int __nf_tables_dump_rules(struct sk_buff *skb,
3007                                   unsigned int *idx,
3008                                   struct netlink_callback *cb,
3009                                   const struct nft_table *table,
3010                                   const struct nft_chain *chain)
3011 {
3012         struct net *net = sock_net(skb->sk);
3013         const struct nft_rule *rule, *prule;
3014         unsigned int s_idx = cb->args[0];
3015         u64 handle;
3016
3017         prule = NULL;
3018         list_for_each_entry_rcu(rule, &chain->rules, list) {
3019                 if (!nft_is_active(net, rule))
3020                         goto cont_skip;
3021                 if (*idx < s_idx)
3022                         goto cont;
3023                 if (*idx > s_idx) {
3024                         memset(&cb->args[1], 0,
3025                                         sizeof(cb->args) - sizeof(cb->args[0]));
3026                 }
3027                 if (prule)
3028                         handle = prule->handle;
3029                 else
3030                         handle = 0;
3031
3032                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3033                                         cb->nlh->nlmsg_seq,
3034                                         NFT_MSG_NEWRULE,
3035                                         NLM_F_MULTI | NLM_F_APPEND,
3036                                         table->family,
3037                                         table, chain, rule, handle) < 0)
3038                         return 1;
3039
3040                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3041 cont:
3042                 prule = rule;
3043 cont_skip:
3044                 (*idx)++;
3045         }
3046         return 0;
3047 }
3048
3049 static int nf_tables_dump_rules(struct sk_buff *skb,
3050                                 struct netlink_callback *cb)
3051 {
3052         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3053         const struct nft_rule_dump_ctx *ctx = cb->data;
3054         struct nft_table *table;
3055         const struct nft_chain *chain;
3056         unsigned int idx = 0;
3057         struct net *net = sock_net(skb->sk);
3058         int family = nfmsg->nfgen_family;
3059         struct nftables_pernet *nft_net;
3060
3061         rcu_read_lock();
3062         nft_net = nft_pernet(net);
3063         cb->seq = READ_ONCE(nft_net->base_seq);
3064
3065         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3066                 if (family != NFPROTO_UNSPEC && family != table->family)
3067                         continue;
3068
3069                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3070                         continue;
3071
3072                 if (ctx && ctx->table && ctx->chain) {
3073                         struct rhlist_head *list, *tmp;
3074
3075                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3076                                                nft_chain_ht_params);
3077                         if (!list)
3078                                 goto done;
3079
3080                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3081                                 if (!nft_is_active(net, chain))
3082                                         continue;
3083                                 __nf_tables_dump_rules(skb, &idx,
3084                                                        cb, table, chain);
3085                                 break;
3086                         }
3087                         goto done;
3088                 }
3089
3090                 list_for_each_entry_rcu(chain, &table->chains, list) {
3091                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3092                                 goto done;
3093                 }
3094
3095                 if (ctx && ctx->table)
3096                         break;
3097         }
3098 done:
3099         rcu_read_unlock();
3100
3101         cb->args[0] = idx;
3102         return skb->len;
3103 }
3104
3105 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3106 {
3107         const struct nlattr * const *nla = cb->data;
3108         struct nft_rule_dump_ctx *ctx = NULL;
3109
3110         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3111                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3112                 if (!ctx)
3113                         return -ENOMEM;
3114
3115                 if (nla[NFTA_RULE_TABLE]) {
3116                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3117                                                         GFP_ATOMIC);
3118                         if (!ctx->table) {
3119                                 kfree(ctx);
3120                                 return -ENOMEM;
3121                         }
3122                 }
3123                 if (nla[NFTA_RULE_CHAIN]) {
3124                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3125                                                 GFP_ATOMIC);
3126                         if (!ctx->chain) {
3127                                 kfree(ctx->table);
3128                                 kfree(ctx);
3129                                 return -ENOMEM;
3130                         }
3131                 }
3132         }
3133
3134         cb->data = ctx;
3135         return 0;
3136 }
3137
3138 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3139 {
3140         struct nft_rule_dump_ctx *ctx = cb->data;
3141
3142         if (ctx) {
3143                 kfree(ctx->table);
3144                 kfree(ctx->chain);
3145                 kfree(ctx);
3146         }
3147         return 0;
3148 }
3149
3150 /* called with rcu_read_lock held */
3151 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3152                              const struct nlattr * const nla[])
3153 {
3154         struct netlink_ext_ack *extack = info->extack;
3155         u8 genmask = nft_genmask_cur(info->net);
3156         u8 family = info->nfmsg->nfgen_family;
3157         const struct nft_chain *chain;
3158         const struct nft_rule *rule;
3159         struct net *net = info->net;
3160         struct nft_table *table;
3161         struct sk_buff *skb2;
3162         int err;
3163
3164         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3165                 struct netlink_dump_control c = {
3166                         .start= nf_tables_dump_rules_start,
3167                         .dump = nf_tables_dump_rules,
3168                         .done = nf_tables_dump_rules_done,
3169                         .module = THIS_MODULE,
3170                         .data = (void *)nla,
3171                 };
3172
3173                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3174         }
3175
3176         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3177         if (IS_ERR(table)) {
3178                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3179                 return PTR_ERR(table);
3180         }
3181
3182         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3183         if (IS_ERR(chain)) {
3184                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3185                 return PTR_ERR(chain);
3186         }
3187
3188         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3189         if (IS_ERR(rule)) {
3190                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3191                 return PTR_ERR(rule);
3192         }
3193
3194         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3195         if (!skb2)
3196                 return -ENOMEM;
3197
3198         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3199                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3200                                        family, table, chain, rule, 0);
3201         if (err < 0)
3202                 goto err_fill_rule_info;
3203
3204         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3205
3206 err_fill_rule_info:
3207         kfree_skb(skb2);
3208         return err;
3209 }
3210
3211 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3212                                    struct nft_rule *rule)
3213 {
3214         struct nft_expr *expr, *next;
3215
3216         /*
3217          * Careful: some expressions might not be initialized in case this
3218          * is called on error from nf_tables_newrule().
3219          */
3220         expr = nft_expr_first(rule);
3221         while (nft_expr_more(rule, expr)) {
3222                 next = nft_expr_next(expr);
3223                 nf_tables_expr_destroy(ctx, expr);
3224                 expr = next;
3225         }
3226         kfree(rule);
3227 }
3228
3229 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3230 {
3231         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3232         nf_tables_rule_destroy(ctx, rule);
3233 }
3234
3235 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3236 {
3237         struct nft_expr *expr, *last;
3238         const struct nft_data *data;
3239         struct nft_rule *rule;
3240         int err;
3241
3242         if (ctx->level == NFT_JUMP_STACK_SIZE)
3243                 return -EMLINK;
3244
3245         list_for_each_entry(rule, &chain->rules, list) {
3246                 if (!nft_is_active_next(ctx->net, rule))
3247                         continue;
3248
3249                 nft_rule_for_each_expr(expr, last, rule) {
3250                         if (!expr->ops->validate)
3251                                 continue;
3252
3253                         err = expr->ops->validate(ctx, expr, &data);
3254                         if (err < 0)
3255                                 return err;
3256                 }
3257         }
3258
3259         return 0;
3260 }
3261 EXPORT_SYMBOL_GPL(nft_chain_validate);
3262
3263 static int nft_table_validate(struct net *net, const struct nft_table *table)
3264 {
3265         struct nft_chain *chain;
3266         struct nft_ctx ctx = {
3267                 .net    = net,
3268                 .family = table->family,
3269         };
3270         int err;
3271
3272         list_for_each_entry(chain, &table->chains, list) {
3273                 if (!nft_is_base_chain(chain))
3274                         continue;
3275
3276                 ctx.chain = chain;
3277                 err = nft_chain_validate(&ctx, chain);
3278                 if (err < 0)
3279                         return err;
3280         }
3281
3282         return 0;
3283 }
3284
3285 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3286                                              const struct nft_chain *chain,
3287                                              const struct nlattr *nla);
3288
3289 #define NFT_RULE_MAXEXPRS       128
3290
3291 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3292                              const struct nlattr * const nla[])
3293 {
3294         struct nftables_pernet *nft_net = nft_pernet(info->net);
3295         struct netlink_ext_ack *extack = info->extack;
3296         unsigned int size, i, n, ulen = 0, usize = 0;
3297         u8 genmask = nft_genmask_next(info->net);
3298         struct nft_rule *rule, *old_rule = NULL;
3299         struct nft_expr_info *expr_info = NULL;
3300         u8 family = info->nfmsg->nfgen_family;
3301         struct nft_flow_rule *flow = NULL;
3302         struct net *net = info->net;
3303         struct nft_userdata *udata;
3304         struct nft_table *table;
3305         struct nft_chain *chain;
3306         struct nft_trans *trans;
3307         u64 handle, pos_handle;
3308         struct nft_expr *expr;
3309         struct nft_ctx ctx;
3310         struct nlattr *tmp;
3311         int err, rem;
3312
3313         lockdep_assert_held(&nft_net->commit_mutex);
3314
3315         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3316                                  NETLINK_CB(skb).portid);
3317         if (IS_ERR(table)) {
3318                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3319                 return PTR_ERR(table);
3320         }
3321
3322         if (nla[NFTA_RULE_CHAIN]) {
3323                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3324                                          genmask);
3325                 if (IS_ERR(chain)) {
3326                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3327                         return PTR_ERR(chain);
3328                 }
3329                 if (nft_chain_is_bound(chain))
3330                         return -EOPNOTSUPP;
3331
3332         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3333                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3334                 if (IS_ERR(chain)) {
3335                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3336                         return PTR_ERR(chain);
3337                 }
3338         } else {
3339                 return -EINVAL;
3340         }
3341
3342         if (nla[NFTA_RULE_HANDLE]) {
3343                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3344                 rule = __nft_rule_lookup(chain, handle);
3345                 if (IS_ERR(rule)) {
3346                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3347                         return PTR_ERR(rule);
3348                 }
3349
3350                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3351                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3352                         return -EEXIST;
3353                 }
3354                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3355                         old_rule = rule;
3356                 else
3357                         return -EOPNOTSUPP;
3358         } else {
3359                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3360                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3361                         return -EINVAL;
3362                 handle = nf_tables_alloc_handle(table);
3363
3364                 if (chain->use == UINT_MAX)
3365                         return -EOVERFLOW;
3366
3367                 if (nla[NFTA_RULE_POSITION]) {
3368                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3369                         old_rule = __nft_rule_lookup(chain, pos_handle);
3370                         if (IS_ERR(old_rule)) {
3371                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3372                                 return PTR_ERR(old_rule);
3373                         }
3374                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3375                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3376                         if (IS_ERR(old_rule)) {
3377                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3378                                 return PTR_ERR(old_rule);
3379                         }
3380                 }
3381         }
3382
3383         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3384
3385         n = 0;
3386         size = 0;
3387         if (nla[NFTA_RULE_EXPRESSIONS]) {
3388                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3389                                            sizeof(struct nft_expr_info),
3390                                            GFP_KERNEL);
3391                 if (!expr_info)
3392                         return -ENOMEM;
3393
3394                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3395                         err = -EINVAL;
3396                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3397                                 goto err_release_expr;
3398                         if (n == NFT_RULE_MAXEXPRS)
3399                                 goto err_release_expr;
3400                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3401                         if (err < 0) {
3402                                 NL_SET_BAD_ATTR(extack, tmp);
3403                                 goto err_release_expr;
3404                         }
3405                         size += expr_info[n].ops->size;
3406                         n++;
3407                 }
3408         }
3409         /* Check for overflow of dlen field */
3410         err = -EFBIG;
3411         if (size >= 1 << 12)
3412                 goto err_release_expr;
3413
3414         if (nla[NFTA_RULE_USERDATA]) {
3415                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3416                 if (ulen > 0)
3417                         usize = sizeof(struct nft_userdata) + ulen;
3418         }
3419
3420         err = -ENOMEM;
3421         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3422         if (rule == NULL)
3423                 goto err_release_expr;
3424
3425         nft_activate_next(net, rule);
3426
3427         rule->handle = handle;
3428         rule->dlen   = size;
3429         rule->udata  = ulen ? 1 : 0;
3430
3431         if (ulen) {
3432                 udata = nft_userdata(rule);
3433                 udata->len = ulen - 1;
3434                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3435         }
3436
3437         expr = nft_expr_first(rule);
3438         for (i = 0; i < n; i++) {
3439                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3440                 if (err < 0) {
3441                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3442                         goto err_release_rule;
3443                 }
3444
3445                 if (expr_info[i].ops->validate)
3446                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3447
3448                 expr_info[i].ops = NULL;
3449                 expr = nft_expr_next(expr);
3450         }
3451
3452         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3453                 flow = nft_flow_rule_create(net, rule);
3454                 if (IS_ERR(flow)) {
3455                         err = PTR_ERR(flow);
3456                         goto err_release_rule;
3457                 }
3458         }
3459
3460         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3461                 err = nft_delrule(&ctx, old_rule);
3462                 if (err < 0)
3463                         goto err_destroy_flow_rule;
3464
3465                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3466                 if (trans == NULL) {
3467                         err = -ENOMEM;
3468                         goto err_destroy_flow_rule;
3469                 }
3470                 list_add_tail_rcu(&rule->list, &old_rule->list);
3471         } else {
3472                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3473                 if (!trans) {
3474                         err = -ENOMEM;
3475                         goto err_destroy_flow_rule;
3476                 }
3477
3478                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3479                         if (old_rule)
3480                                 list_add_rcu(&rule->list, &old_rule->list);
3481                         else
3482                                 list_add_tail_rcu(&rule->list, &chain->rules);
3483                  } else {
3484                         if (old_rule)
3485                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3486                         else
3487                                 list_add_rcu(&rule->list, &chain->rules);
3488                 }
3489         }
3490         kvfree(expr_info);
3491         chain->use++;
3492
3493         if (flow)
3494                 nft_trans_flow_rule(trans) = flow;
3495
3496         if (nft_net->validate_state == NFT_VALIDATE_DO)
3497                 return nft_table_validate(net, table);
3498
3499         return 0;
3500
3501 err_destroy_flow_rule:
3502         if (flow)
3503                 nft_flow_rule_destroy(flow);
3504 err_release_rule:
3505         nf_tables_rule_release(&ctx, rule);
3506 err_release_expr:
3507         for (i = 0; i < n; i++) {
3508                 if (expr_info[i].ops) {
3509                         module_put(expr_info[i].ops->type->owner);
3510                         if (expr_info[i].ops->type->release_ops)
3511                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3512                 }
3513         }
3514         kvfree(expr_info);
3515
3516         return err;
3517 }
3518
3519 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3520                                              const struct nft_chain *chain,
3521                                              const struct nlattr *nla)
3522 {
3523         struct nftables_pernet *nft_net = nft_pernet(net);
3524         u32 id = ntohl(nla_get_be32(nla));
3525         struct nft_trans *trans;
3526
3527         list_for_each_entry(trans, &nft_net->commit_list, list) {
3528                 struct nft_rule *rule = nft_trans_rule(trans);
3529
3530                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3531                     trans->ctx.chain == chain &&
3532                     id == nft_trans_rule_id(trans))
3533                         return rule;
3534         }
3535         return ERR_PTR(-ENOENT);
3536 }
3537
3538 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3539                              const struct nlattr * const nla[])
3540 {
3541         struct netlink_ext_ack *extack = info->extack;
3542         u8 genmask = nft_genmask_next(info->net);
3543         u8 family = info->nfmsg->nfgen_family;
3544         struct nft_chain *chain = NULL;
3545         struct net *net = info->net;
3546         struct nft_table *table;
3547         struct nft_rule *rule;
3548         struct nft_ctx ctx;
3549         int err = 0;
3550
3551         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3552                                  NETLINK_CB(skb).portid);
3553         if (IS_ERR(table)) {
3554                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3555                 return PTR_ERR(table);
3556         }
3557
3558         if (nla[NFTA_RULE_CHAIN]) {
3559                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3560                                          genmask);
3561                 if (IS_ERR(chain)) {
3562                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3563                         return PTR_ERR(chain);
3564                 }
3565                 if (nft_chain_is_bound(chain))
3566                         return -EOPNOTSUPP;
3567         }
3568
3569         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3570
3571         if (chain) {
3572                 if (nla[NFTA_RULE_HANDLE]) {
3573                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3574                         if (IS_ERR(rule)) {
3575                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3576                                 return PTR_ERR(rule);
3577                         }
3578
3579                         err = nft_delrule(&ctx, rule);
3580                 } else if (nla[NFTA_RULE_ID]) {
3581                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3582                         if (IS_ERR(rule)) {
3583                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3584                                 return PTR_ERR(rule);
3585                         }
3586
3587                         err = nft_delrule(&ctx, rule);
3588                 } else {
3589                         err = nft_delrule_by_chain(&ctx);
3590                 }
3591         } else {
3592                 list_for_each_entry(chain, &table->chains, list) {
3593                         if (!nft_is_active_next(net, chain))
3594                                 continue;
3595
3596                         ctx.chain = chain;
3597                         err = nft_delrule_by_chain(&ctx);
3598                         if (err < 0)
3599                                 break;
3600                 }
3601         }
3602
3603         return err;
3604 }
3605
3606 /*
3607  * Sets
3608  */
3609 static const struct nft_set_type *nft_set_types[] = {
3610         &nft_set_hash_fast_type,
3611         &nft_set_hash_type,
3612         &nft_set_rhash_type,
3613         &nft_set_bitmap_type,
3614         &nft_set_rbtree_type,
3615 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3616         &nft_set_pipapo_avx2_type,
3617 #endif
3618         &nft_set_pipapo_type,
3619 };
3620
3621 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3622                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3623                                  NFT_SET_EVAL)
3624
3625 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3626 {
3627         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3628 }
3629
3630 /*
3631  * Select a set implementation based on the data characteristics and the
3632  * given policy. The total memory use might not be known if no size is
3633  * given, in that case the amount of memory per element is used.
3634  */
3635 static const struct nft_set_ops *
3636 nft_select_set_ops(const struct nft_ctx *ctx,
3637                    const struct nlattr * const nla[],
3638                    const struct nft_set_desc *desc,
3639                    enum nft_set_policies policy)
3640 {
3641         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3642         const struct nft_set_ops *ops, *bops;
3643         struct nft_set_estimate est, best;
3644         const struct nft_set_type *type;
3645         u32 flags = 0;
3646         int i;
3647
3648         lockdep_assert_held(&nft_net->commit_mutex);
3649         lockdep_nfnl_nft_mutex_not_held();
3650
3651         if (nla[NFTA_SET_FLAGS] != NULL)
3652                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3653
3654         bops        = NULL;
3655         best.size   = ~0;
3656         best.lookup = ~0;
3657         best.space  = ~0;
3658
3659         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3660                 type = nft_set_types[i];
3661                 ops = &type->ops;
3662
3663                 if (!nft_set_ops_candidate(type, flags))
3664                         continue;
3665                 if (!ops->estimate(desc, flags, &est))
3666                         continue;
3667
3668                 switch (policy) {
3669                 case NFT_SET_POL_PERFORMANCE:
3670                         if (est.lookup < best.lookup)
3671                                 break;
3672                         if (est.lookup == best.lookup &&
3673                             est.space < best.space)
3674                                 break;
3675                         continue;
3676                 case NFT_SET_POL_MEMORY:
3677                         if (!desc->size) {
3678                                 if (est.space < best.space)
3679                                         break;
3680                                 if (est.space == best.space &&
3681                                     est.lookup < best.lookup)
3682                                         break;
3683                         } else if (est.size < best.size || !bops) {
3684                                 break;
3685                         }
3686                         continue;
3687                 default:
3688                         break;
3689                 }
3690
3691                 bops = ops;
3692                 best = est;
3693         }
3694
3695         if (bops != NULL)
3696                 return bops;
3697
3698         return ERR_PTR(-EOPNOTSUPP);
3699 }
3700
3701 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3702         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3703                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3704         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3705                                             .len = NFT_SET_MAXNAMELEN - 1 },
3706         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3707         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3708         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3709         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3710         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3711         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3712         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3713         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3714         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3715         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3716         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3717                                             .len  = NFT_USERDATA_MAXLEN },
3718         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3719         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3720         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3721         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3722 };
3723
3724 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3725         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3726         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3727 };
3728
3729 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3730                                       const struct nlattr *nla, u8 genmask)
3731 {
3732         struct nft_set *set;
3733
3734         if (nla == NULL)
3735                 return ERR_PTR(-EINVAL);
3736
3737         list_for_each_entry_rcu(set, &table->sets, list) {
3738                 if (!nla_strcmp(nla, set->name) &&
3739                     nft_active_genmask(set, genmask))
3740                         return set;
3741         }
3742         return ERR_PTR(-ENOENT);
3743 }
3744
3745 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3746                                                const struct nlattr *nla,
3747                                                u8 genmask)
3748 {
3749         struct nft_set *set;
3750
3751         list_for_each_entry(set, &table->sets, list) {
3752                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3753                     nft_active_genmask(set, genmask))
3754                         return set;
3755         }
3756         return ERR_PTR(-ENOENT);
3757 }
3758
3759 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3760                                            const struct nft_table *table,
3761                                            const struct nlattr *nla, u8 genmask)
3762 {
3763         struct nftables_pernet *nft_net = nft_pernet(net);
3764         u32 id = ntohl(nla_get_be32(nla));
3765         struct nft_trans *trans;
3766
3767         list_for_each_entry(trans, &nft_net->commit_list, list) {
3768                 if (trans->msg_type == NFT_MSG_NEWSET) {
3769                         struct nft_set *set = nft_trans_set(trans);
3770
3771                         if (id == nft_trans_set_id(trans) &&
3772                             set->table == table &&
3773                             nft_active_genmask(set, genmask))
3774                                 return set;
3775                 }
3776         }
3777         return ERR_PTR(-ENOENT);
3778 }
3779
3780 struct nft_set *nft_set_lookup_global(const struct net *net,
3781                                       const struct nft_table *table,
3782                                       const struct nlattr *nla_set_name,
3783                                       const struct nlattr *nla_set_id,
3784                                       u8 genmask)
3785 {
3786         struct nft_set *set;
3787
3788         set = nft_set_lookup(table, nla_set_name, genmask);
3789         if (IS_ERR(set)) {
3790                 if (!nla_set_id)
3791                         return set;
3792
3793                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3794         }
3795         return set;
3796 }
3797 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3798
3799 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3800                                     const char *name)
3801 {
3802         const struct nft_set *i;
3803         const char *p;
3804         unsigned long *inuse;
3805         unsigned int n = 0, min = 0;
3806
3807         p = strchr(name, '%');
3808         if (p != NULL) {
3809                 if (p[1] != 'd' || strchr(p + 2, '%'))
3810                         return -EINVAL;
3811
3812                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3813                 if (inuse == NULL)
3814                         return -ENOMEM;
3815 cont:
3816                 list_for_each_entry(i, &ctx->table->sets, list) {
3817                         int tmp;
3818
3819                         if (!nft_is_active_next(ctx->net, i))
3820                                 continue;
3821                         if (!sscanf(i->name, name, &tmp))
3822                                 continue;
3823                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3824                                 continue;
3825
3826                         set_bit(tmp - min, inuse);
3827                 }
3828
3829                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3830                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3831                         min += BITS_PER_BYTE * PAGE_SIZE;
3832                         memset(inuse, 0, PAGE_SIZE);
3833                         goto cont;
3834                 }
3835                 free_page((unsigned long)inuse);
3836         }
3837
3838         set->name = kasprintf(GFP_KERNEL, name, min + n);
3839         if (!set->name)
3840                 return -ENOMEM;
3841
3842         list_for_each_entry(i, &ctx->table->sets, list) {
3843                 if (!nft_is_active_next(ctx->net, i))
3844                         continue;
3845                 if (!strcmp(set->name, i->name)) {
3846                         kfree(set->name);
3847                         set->name = NULL;
3848                         return -ENFILE;
3849                 }
3850         }
3851         return 0;
3852 }
3853
3854 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3855 {
3856         u64 ms = be64_to_cpu(nla_get_be64(nla));
3857         u64 max = (u64)(~((u64)0));
3858
3859         max = div_u64(max, NSEC_PER_MSEC);
3860         if (ms >= max)
3861                 return -ERANGE;
3862
3863         ms *= NSEC_PER_MSEC;
3864         *result = nsecs_to_jiffies64(ms);
3865         return 0;
3866 }
3867
3868 __be64 nf_jiffies64_to_msecs(u64 input)
3869 {
3870         return cpu_to_be64(jiffies64_to_msecs(input));
3871 }
3872
3873 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3874                                      const struct nft_set *set)
3875 {
3876         struct nlattr *concat, *field;
3877         int i;
3878
3879         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3880         if (!concat)
3881                 return -ENOMEM;
3882
3883         for (i = 0; i < set->field_count; i++) {
3884                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3885                 if (!field)
3886                         return -ENOMEM;
3887
3888                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3889                                  htonl(set->field_len[i])))
3890                         return -ENOMEM;
3891
3892                 nla_nest_end(skb, field);
3893         }
3894
3895         nla_nest_end(skb, concat);
3896
3897         return 0;
3898 }
3899
3900 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3901                               const struct nft_set *set, u16 event, u16 flags)
3902 {
3903         struct nlmsghdr *nlh;
3904         u32 portid = ctx->portid;
3905         struct nlattr *nest;
3906         u32 seq = ctx->seq;
3907         int i;
3908
3909         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3910         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3911                            NFNETLINK_V0, nft_base_seq(ctx->net));
3912         if (!nlh)
3913                 goto nla_put_failure;
3914
3915         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3916                 goto nla_put_failure;
3917         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3918                 goto nla_put_failure;
3919         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3920                          NFTA_SET_PAD))
3921                 goto nla_put_failure;
3922         if (set->flags != 0)
3923                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3924                         goto nla_put_failure;
3925
3926         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3927                 goto nla_put_failure;
3928         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3929                 goto nla_put_failure;
3930         if (set->flags & NFT_SET_MAP) {
3931                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3932                         goto nla_put_failure;
3933                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3934                         goto nla_put_failure;
3935         }
3936         if (set->flags & NFT_SET_OBJECT &&
3937             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3938                 goto nla_put_failure;
3939
3940         if (set->timeout &&
3941             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3942                          nf_jiffies64_to_msecs(set->timeout),
3943                          NFTA_SET_PAD))
3944                 goto nla_put_failure;
3945         if (set->gc_int &&
3946             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3947                 goto nla_put_failure;
3948
3949         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3950                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3951                         goto nla_put_failure;
3952         }
3953
3954         if (set->udata &&
3955             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3956                 goto nla_put_failure;
3957
3958         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3959         if (!nest)
3960                 goto nla_put_failure;
3961         if (set->size &&
3962             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3963                 goto nla_put_failure;
3964
3965         if (set->field_count > 1 &&
3966             nf_tables_fill_set_concat(skb, set))
3967                 goto nla_put_failure;
3968
3969         nla_nest_end(skb, nest);
3970
3971         if (set->num_exprs == 1) {
3972                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3973                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3974                         goto nla_put_failure;
3975
3976                 nla_nest_end(skb, nest);
3977         } else if (set->num_exprs > 1) {
3978                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3979                 if (nest == NULL)
3980                         goto nla_put_failure;
3981
3982                 for (i = 0; i < set->num_exprs; i++) {
3983                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3984                                           set->exprs[i]) < 0)
3985                                 goto nla_put_failure;
3986                 }
3987                 nla_nest_end(skb, nest);
3988         }
3989
3990         nlmsg_end(skb, nlh);
3991         return 0;
3992
3993 nla_put_failure:
3994         nlmsg_trim(skb, nlh);
3995         return -1;
3996 }
3997
3998 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3999                                  const struct nft_set *set, int event,
4000                                  gfp_t gfp_flags)
4001 {
4002         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4003         u32 portid = ctx->portid;
4004         struct sk_buff *skb;
4005         u16 flags = 0;
4006         int err;
4007
4008         if (!ctx->report &&
4009             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4010                 return;
4011
4012         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4013         if (skb == NULL)
4014                 goto err;
4015
4016         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4017                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4018
4019         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4020         if (err < 0) {
4021                 kfree_skb(skb);
4022                 goto err;
4023         }
4024
4025         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4026         return;
4027 err:
4028         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4029 }
4030
4031 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4032 {
4033         const struct nft_set *set;
4034         unsigned int idx, s_idx = cb->args[0];
4035         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4036         struct net *net = sock_net(skb->sk);
4037         struct nft_ctx *ctx = cb->data, ctx_set;
4038         struct nftables_pernet *nft_net;
4039
4040         if (cb->args[1])
4041                 return skb->len;
4042
4043         rcu_read_lock();
4044         nft_net = nft_pernet(net);
4045         cb->seq = READ_ONCE(nft_net->base_seq);
4046
4047         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4048                 if (ctx->family != NFPROTO_UNSPEC &&
4049                     ctx->family != table->family)
4050                         continue;
4051
4052                 if (ctx->table && ctx->table != table)
4053                         continue;
4054
4055                 if (cur_table) {
4056                         if (cur_table != table)
4057                                 continue;
4058
4059                         cur_table = NULL;
4060                 }
4061                 idx = 0;
4062                 list_for_each_entry_rcu(set, &table->sets, list) {
4063                         if (idx < s_idx)
4064                                 goto cont;
4065                         if (!nft_is_active(net, set))
4066                                 goto cont;
4067
4068                         ctx_set = *ctx;
4069                         ctx_set.table = table;
4070                         ctx_set.family = table->family;
4071
4072                         if (nf_tables_fill_set(skb, &ctx_set, set,
4073                                                NFT_MSG_NEWSET,
4074                                                NLM_F_MULTI) < 0) {
4075                                 cb->args[0] = idx;
4076                                 cb->args[2] = (unsigned long) table;
4077                                 goto done;
4078                         }
4079                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4080 cont:
4081                         idx++;
4082                 }
4083                 if (s_idx)
4084                         s_idx = 0;
4085         }
4086         cb->args[1] = 1;
4087 done:
4088         rcu_read_unlock();
4089         return skb->len;
4090 }
4091
4092 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4093 {
4094         struct nft_ctx *ctx_dump = NULL;
4095
4096         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4097         if (ctx_dump == NULL)
4098                 return -ENOMEM;
4099
4100         cb->data = ctx_dump;
4101         return 0;
4102 }
4103
4104 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4105 {
4106         kfree(cb->data);
4107         return 0;
4108 }
4109
4110 /* called with rcu_read_lock held */
4111 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4112                             const struct nlattr * const nla[])
4113 {
4114         struct netlink_ext_ack *extack = info->extack;
4115         u8 genmask = nft_genmask_cur(info->net);
4116         u8 family = info->nfmsg->nfgen_family;
4117         struct nft_table *table = NULL;
4118         struct net *net = info->net;
4119         const struct nft_set *set;
4120         struct sk_buff *skb2;
4121         struct nft_ctx ctx;
4122         int err;
4123
4124         if (nla[NFTA_SET_TABLE]) {
4125                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4126                                          genmask, 0);
4127                 if (IS_ERR(table)) {
4128                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4129                         return PTR_ERR(table);
4130                 }
4131         }
4132
4133         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4134
4135         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4136                 struct netlink_dump_control c = {
4137                         .start = nf_tables_dump_sets_start,
4138                         .dump = nf_tables_dump_sets,
4139                         .done = nf_tables_dump_sets_done,
4140                         .data = &ctx,
4141                         .module = THIS_MODULE,
4142                 };
4143
4144                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4145         }
4146
4147         /* Only accept unspec with dump */
4148         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4149                 return -EAFNOSUPPORT;
4150         if (!nla[NFTA_SET_TABLE])
4151                 return -EINVAL;
4152
4153         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4154         if (IS_ERR(set))
4155                 return PTR_ERR(set);
4156
4157         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4158         if (skb2 == NULL)
4159                 return -ENOMEM;
4160
4161         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4162         if (err < 0)
4163                 goto err_fill_set_info;
4164
4165         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4166
4167 err_fill_set_info:
4168         kfree_skb(skb2);
4169         return err;
4170 }
4171
4172 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4173         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4174 };
4175
4176 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4177                                      struct nft_set_desc *desc)
4178 {
4179         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4180         u32 len;
4181         int err;
4182
4183         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4184                 return -E2BIG;
4185
4186         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4187                                           nft_concat_policy, NULL);
4188         if (err < 0)
4189                 return err;
4190
4191         if (!tb[NFTA_SET_FIELD_LEN])
4192                 return -EINVAL;
4193
4194         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4195         if (!len || len > U8_MAX)
4196                 return -EINVAL;
4197
4198         desc->field_len[desc->field_count++] = len;
4199
4200         return 0;
4201 }
4202
4203 static int nft_set_desc_concat(struct nft_set_desc *desc,
4204                                const struct nlattr *nla)
4205 {
4206         struct nlattr *attr;
4207         u32 num_regs = 0;
4208         int rem, err, i;
4209
4210         nla_for_each_nested(attr, nla, rem) {
4211                 if (nla_type(attr) != NFTA_LIST_ELEM)
4212                         return -EINVAL;
4213
4214                 err = nft_set_desc_concat_parse(attr, desc);
4215                 if (err < 0)
4216                         return err;
4217         }
4218
4219         for (i = 0; i < desc->field_count; i++)
4220                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4221
4222         if (num_regs > NFT_REG32_COUNT)
4223                 return -E2BIG;
4224
4225         return 0;
4226 }
4227
4228 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4229                                     const struct nlattr *nla)
4230 {
4231         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4232         int err;
4233
4234         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4235                                           nft_set_desc_policy, NULL);
4236         if (err < 0)
4237                 return err;
4238
4239         if (da[NFTA_SET_DESC_SIZE] != NULL)
4240                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4241         if (da[NFTA_SET_DESC_CONCAT])
4242                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4243
4244         return err;
4245 }
4246
4247 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4248                             const struct nlattr * const nla[])
4249 {
4250         u32 ktype, dtype, flags, policy, gc_int, objtype;
4251         struct netlink_ext_ack *extack = info->extack;
4252         u8 genmask = nft_genmask_next(info->net);
4253         u8 family = info->nfmsg->nfgen_family;
4254         const struct nft_set_ops *ops;
4255         struct nft_expr *expr = NULL;
4256         struct net *net = info->net;
4257         struct nft_set_desc desc;
4258         struct nft_table *table;
4259         unsigned char *udata;
4260         struct nft_set *set;
4261         struct nft_ctx ctx;
4262         size_t alloc_size;
4263         u64 timeout;
4264         char *name;
4265         int err, i;
4266         u16 udlen;
4267         u64 size;
4268
4269         if (nla[NFTA_SET_TABLE] == NULL ||
4270             nla[NFTA_SET_NAME] == NULL ||
4271             nla[NFTA_SET_KEY_LEN] == NULL ||
4272             nla[NFTA_SET_ID] == NULL)
4273                 return -EINVAL;
4274
4275         memset(&desc, 0, sizeof(desc));
4276
4277         ktype = NFT_DATA_VALUE;
4278         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4279                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4280                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4281                         return -EINVAL;
4282         }
4283
4284         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4285         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4286                 return -EINVAL;
4287
4288         flags = 0;
4289         if (nla[NFTA_SET_FLAGS] != NULL) {
4290                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4291                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4292                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4293                               NFT_SET_MAP | NFT_SET_EVAL |
4294                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4295                         return -EOPNOTSUPP;
4296                 /* Only one of these operations is supported */
4297                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4298                              (NFT_SET_MAP | NFT_SET_OBJECT))
4299                         return -EOPNOTSUPP;
4300                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4301                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4302                         return -EOPNOTSUPP;
4303         }
4304
4305         dtype = 0;
4306         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4307                 if (!(flags & NFT_SET_MAP))
4308                         return -EINVAL;
4309
4310                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4311                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4312                     dtype != NFT_DATA_VERDICT)
4313                         return -EINVAL;
4314
4315                 if (dtype != NFT_DATA_VERDICT) {
4316                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4317                                 return -EINVAL;
4318                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4319                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4320                                 return -EINVAL;
4321                 } else
4322                         desc.dlen = sizeof(struct nft_verdict);
4323         } else if (flags & NFT_SET_MAP)
4324                 return -EINVAL;
4325
4326         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4327                 if (!(flags & NFT_SET_OBJECT))
4328                         return -EINVAL;
4329
4330                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4331                 if (objtype == NFT_OBJECT_UNSPEC ||
4332                     objtype > NFT_OBJECT_MAX)
4333                         return -EOPNOTSUPP;
4334         } else if (flags & NFT_SET_OBJECT)
4335                 return -EINVAL;
4336         else
4337                 objtype = NFT_OBJECT_UNSPEC;
4338
4339         timeout = 0;
4340         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4341                 if (!(flags & NFT_SET_TIMEOUT))
4342                         return -EINVAL;
4343
4344                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4345                 if (err)
4346                         return err;
4347         }
4348         gc_int = 0;
4349         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4350                 if (!(flags & NFT_SET_TIMEOUT))
4351                         return -EINVAL;
4352                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4353         }
4354
4355         policy = NFT_SET_POL_PERFORMANCE;
4356         if (nla[NFTA_SET_POLICY] != NULL)
4357                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4358
4359         if (nla[NFTA_SET_DESC] != NULL) {
4360                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4361                 if (err < 0)
4362                         return err;
4363
4364                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4365                         return -EINVAL;
4366         } else if (flags & NFT_SET_CONCAT) {
4367                 return -EINVAL;
4368         }
4369
4370         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4371                 desc.expr = true;
4372
4373         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4374                                  NETLINK_CB(skb).portid);
4375         if (IS_ERR(table)) {
4376                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4377                 return PTR_ERR(table);
4378         }
4379
4380         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4381
4382         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4383         if (IS_ERR(set)) {
4384                 if (PTR_ERR(set) != -ENOENT) {
4385                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4386                         return PTR_ERR(set);
4387                 }
4388         } else {
4389                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4390                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4391                         return -EEXIST;
4392                 }
4393                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4394                         return -EOPNOTSUPP;
4395
4396                 return 0;
4397         }
4398
4399         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4400                 return -ENOENT;
4401
4402         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4403         if (IS_ERR(ops))
4404                 return PTR_ERR(ops);
4405
4406         udlen = 0;
4407         if (nla[NFTA_SET_USERDATA])
4408                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4409
4410         size = 0;
4411         if (ops->privsize != NULL)
4412                 size = ops->privsize(nla, &desc);
4413         alloc_size = sizeof(*set) + size + udlen;
4414         if (alloc_size < size || alloc_size > INT_MAX)
4415                 return -ENOMEM;
4416         set = kvzalloc(alloc_size, GFP_KERNEL);
4417         if (!set)
4418                 return -ENOMEM;
4419
4420         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4421         if (!name) {
4422                 err = -ENOMEM;
4423                 goto err_set_name;
4424         }
4425
4426         err = nf_tables_set_alloc_name(&ctx, set, name);
4427         kfree(name);
4428         if (err < 0)
4429                 goto err_set_name;
4430
4431         udata = NULL;
4432         if (udlen) {
4433                 udata = set->data + size;
4434                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4435         }
4436
4437         INIT_LIST_HEAD(&set->bindings);
4438         INIT_LIST_HEAD(&set->catchall_list);
4439         set->table = table;
4440         write_pnet(&set->net, net);
4441         set->ops = ops;
4442         set->ktype = ktype;
4443         set->klen = desc.klen;
4444         set->dtype = dtype;
4445         set->objtype = objtype;
4446         set->dlen = desc.dlen;
4447         set->flags = flags;
4448         set->size = desc.size;
4449         set->policy = policy;
4450         set->udlen = udlen;
4451         set->udata = udata;
4452         set->timeout = timeout;
4453         set->gc_int = gc_int;
4454
4455         set->field_count = desc.field_count;
4456         for (i = 0; i < desc.field_count; i++)
4457                 set->field_len[i] = desc.field_len[i];
4458
4459         err = ops->init(set, &desc, nla);
4460         if (err < 0)
4461                 goto err_set_init;
4462
4463         if (nla[NFTA_SET_EXPR]) {
4464                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4465                 if (IS_ERR(expr)) {
4466                         err = PTR_ERR(expr);
4467                         goto err_set_expr_alloc;
4468                 }
4469                 set->exprs[0] = expr;
4470                 set->num_exprs++;
4471         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4472                 struct nft_expr *expr;
4473                 struct nlattr *tmp;
4474                 int left;
4475
4476                 if (!(flags & NFT_SET_EXPR)) {
4477                         err = -EINVAL;
4478                         goto err_set_expr_alloc;
4479                 }
4480                 i = 0;
4481                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4482                         if (i == NFT_SET_EXPR_MAX) {
4483                                 err = -E2BIG;
4484                                 goto err_set_expr_alloc;
4485                         }
4486                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4487                                 err = -EINVAL;
4488                                 goto err_set_expr_alloc;
4489                         }
4490                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4491                         if (IS_ERR(expr)) {
4492                                 err = PTR_ERR(expr);
4493                                 goto err_set_expr_alloc;
4494                         }
4495                         set->exprs[i++] = expr;
4496                         set->num_exprs++;
4497                 }
4498         }
4499
4500         set->handle = nf_tables_alloc_handle(table);
4501
4502         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4503         if (err < 0)
4504                 goto err_set_expr_alloc;
4505
4506         list_add_tail_rcu(&set->list, &table->sets);
4507         table->use++;
4508         return 0;
4509
4510 err_set_expr_alloc:
4511         for (i = 0; i < set->num_exprs; i++)
4512                 nft_expr_destroy(&ctx, set->exprs[i]);
4513
4514         ops->destroy(set);
4515 err_set_init:
4516         kfree(set->name);
4517 err_set_name:
4518         kvfree(set);
4519         return err;
4520 }
4521
4522 struct nft_set_elem_catchall {
4523         struct list_head        list;
4524         struct rcu_head         rcu;
4525         void                    *elem;
4526 };
4527
4528 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4529                                      struct nft_set *set)
4530 {
4531         struct nft_set_elem_catchall *next, *catchall;
4532
4533         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4534                 list_del_rcu(&catchall->list);
4535                 nft_set_elem_destroy(set, catchall->elem, true);
4536                 kfree_rcu(catchall, rcu);
4537         }
4538 }
4539
4540 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4541 {
4542         int i;
4543
4544         if (WARN_ON(set->use > 0))
4545                 return;
4546
4547         for (i = 0; i < set->num_exprs; i++)
4548                 nft_expr_destroy(ctx, set->exprs[i]);
4549
4550         set->ops->destroy(set);
4551         nft_set_catchall_destroy(ctx, set);
4552         kfree(set->name);
4553         kvfree(set);
4554 }
4555
4556 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4557                             const struct nlattr * const nla[])
4558 {
4559         struct netlink_ext_ack *extack = info->extack;
4560         u8 genmask = nft_genmask_next(info->net);
4561         u8 family = info->nfmsg->nfgen_family;
4562         struct net *net = info->net;
4563         const struct nlattr *attr;
4564         struct nft_table *table;
4565         struct nft_set *set;
4566         struct nft_ctx ctx;
4567
4568         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4569                 return -EAFNOSUPPORT;
4570
4571         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4572                                  genmask, NETLINK_CB(skb).portid);
4573         if (IS_ERR(table)) {
4574                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4575                 return PTR_ERR(table);
4576         }
4577
4578         if (nla[NFTA_SET_HANDLE]) {
4579                 attr = nla[NFTA_SET_HANDLE];
4580                 set = nft_set_lookup_byhandle(table, attr, genmask);
4581         } else {
4582                 attr = nla[NFTA_SET_NAME];
4583                 set = nft_set_lookup(table, attr, genmask);
4584         }
4585
4586         if (IS_ERR(set)) {
4587                 NL_SET_BAD_ATTR(extack, attr);
4588                 return PTR_ERR(set);
4589         }
4590         if (set->use ||
4591             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4592              atomic_read(&set->nelems) > 0)) {
4593                 NL_SET_BAD_ATTR(extack, attr);
4594                 return -EBUSY;
4595         }
4596
4597         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4598
4599         return nft_delset(&ctx, set);
4600 }
4601
4602 static int nft_validate_register_store(const struct nft_ctx *ctx,
4603                                        enum nft_registers reg,
4604                                        const struct nft_data *data,
4605                                        enum nft_data_types type,
4606                                        unsigned int len);
4607
4608 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4609                                      struct nft_set *set,
4610                                      struct nft_set_elem *elem)
4611 {
4612         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4613         enum nft_registers dreg;
4614
4615         dreg = nft_type_to_reg(set->dtype);
4616         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4617                                            set->dtype == NFT_DATA_VERDICT ?
4618                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4619                                            set->dlen);
4620 }
4621
4622 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4623                                         struct nft_set *set,
4624                                         const struct nft_set_iter *iter,
4625                                         struct nft_set_elem *elem)
4626 {
4627         return nft_setelem_data_validate(ctx, set, elem);
4628 }
4629
4630 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4631                                        struct nft_set *set)
4632 {
4633         u8 genmask = nft_genmask_next(ctx->net);
4634         struct nft_set_elem_catchall *catchall;
4635         struct nft_set_elem elem;
4636         struct nft_set_ext *ext;
4637         int ret = 0;
4638
4639         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4640                 ext = nft_set_elem_ext(set, catchall->elem);
4641                 if (!nft_set_elem_active(ext, genmask))
4642                         continue;
4643
4644                 elem.priv = catchall->elem;
4645                 ret = nft_setelem_data_validate(ctx, set, &elem);
4646                 if (ret < 0)
4647                         break;
4648         }
4649
4650         return ret;
4651 }
4652
4653 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4654                        struct nft_set_binding *binding)
4655 {
4656         struct nft_set_binding *i;
4657         struct nft_set_iter iter;
4658
4659         if (set->use == UINT_MAX)
4660                 return -EOVERFLOW;
4661
4662         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4663                 return -EBUSY;
4664
4665         if (binding->flags & NFT_SET_MAP) {
4666                 /* If the set is already bound to the same chain all
4667                  * jumps are already validated for that chain.
4668                  */
4669                 list_for_each_entry(i, &set->bindings, list) {
4670                         if (i->flags & NFT_SET_MAP &&
4671                             i->chain == binding->chain)
4672                                 goto bind;
4673                 }
4674
4675                 iter.genmask    = nft_genmask_next(ctx->net);
4676                 iter.skip       = 0;
4677                 iter.count      = 0;
4678                 iter.err        = 0;
4679                 iter.fn         = nf_tables_bind_check_setelem;
4680
4681                 set->ops->walk(ctx, set, &iter);
4682                 if (!iter.err)
4683                         iter.err = nft_set_catchall_bind_check(ctx, set);
4684
4685                 if (iter.err < 0)
4686                         return iter.err;
4687         }
4688 bind:
4689         binding->chain = ctx->chain;
4690         list_add_tail_rcu(&binding->list, &set->bindings);
4691         nft_set_trans_bind(ctx, set);
4692         set->use++;
4693
4694         return 0;
4695 }
4696 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4697
4698 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4699                                  struct nft_set_binding *binding, bool event)
4700 {
4701         list_del_rcu(&binding->list);
4702
4703         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4704                 list_del_rcu(&set->list);
4705                 if (event)
4706                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4707                                              GFP_KERNEL);
4708         }
4709 }
4710
4711 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4712                               struct nft_set_binding *binding,
4713                               enum nft_trans_phase phase)
4714 {
4715         switch (phase) {
4716         case NFT_TRANS_PREPARE:
4717                 set->use--;
4718                 return;
4719         case NFT_TRANS_ABORT:
4720         case NFT_TRANS_RELEASE:
4721                 set->use--;
4722                 fallthrough;
4723         default:
4724                 nf_tables_unbind_set(ctx, set, binding,
4725                                      phase == NFT_TRANS_COMMIT);
4726         }
4727 }
4728 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4729
4730 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4731 {
4732         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4733                 nft_set_destroy(ctx, set);
4734 }
4735 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4736
4737 const struct nft_set_ext_type nft_set_ext_types[] = {
4738         [NFT_SET_EXT_KEY]               = {
4739                 .align  = __alignof__(u32),
4740         },
4741         [NFT_SET_EXT_DATA]              = {
4742                 .align  = __alignof__(u32),
4743         },
4744         [NFT_SET_EXT_EXPRESSIONS]       = {
4745                 .align  = __alignof__(struct nft_set_elem_expr),
4746         },
4747         [NFT_SET_EXT_OBJREF]            = {
4748                 .len    = sizeof(struct nft_object *),
4749                 .align  = __alignof__(struct nft_object *),
4750         },
4751         [NFT_SET_EXT_FLAGS]             = {
4752                 .len    = sizeof(u8),
4753                 .align  = __alignof__(u8),
4754         },
4755         [NFT_SET_EXT_TIMEOUT]           = {
4756                 .len    = sizeof(u64),
4757                 .align  = __alignof__(u64),
4758         },
4759         [NFT_SET_EXT_EXPIRATION]        = {
4760                 .len    = sizeof(u64),
4761                 .align  = __alignof__(u64),
4762         },
4763         [NFT_SET_EXT_USERDATA]          = {
4764                 .len    = sizeof(struct nft_userdata),
4765                 .align  = __alignof__(struct nft_userdata),
4766         },
4767         [NFT_SET_EXT_KEY_END]           = {
4768                 .align  = __alignof__(u32),
4769         },
4770 };
4771
4772 /*
4773  * Set elements
4774  */
4775
4776 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4777         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4778         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4779         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4780         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4781         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4782         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4783                                             .len = NFT_USERDATA_MAXLEN },
4784         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4785         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4786                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4787         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4788         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4789 };
4790
4791 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4792         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4793                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4794         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4795                                             .len = NFT_SET_MAXNAMELEN - 1 },
4796         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4797         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4798 };
4799
4800 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4801                                   const struct nft_set *set,
4802                                   const struct nft_set_ext *ext)
4803 {
4804         struct nft_set_elem_expr *elem_expr;
4805         u32 size, num_exprs = 0;
4806         struct nft_expr *expr;
4807         struct nlattr *nest;
4808
4809         elem_expr = nft_set_ext_expr(ext);
4810         nft_setelem_expr_foreach(expr, elem_expr, size)
4811                 num_exprs++;
4812
4813         if (num_exprs == 1) {
4814                 expr = nft_setelem_expr_at(elem_expr, 0);
4815                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4816                         return -1;
4817
4818                 return 0;
4819         } else if (num_exprs > 1) {
4820                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4821                 if (nest == NULL)
4822                         goto nla_put_failure;
4823
4824                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4825                         expr = nft_setelem_expr_at(elem_expr, size);
4826                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4827                                 goto nla_put_failure;
4828                 }
4829                 nla_nest_end(skb, nest);
4830         }
4831         return 0;
4832
4833 nla_put_failure:
4834         return -1;
4835 }
4836
4837 static int nf_tables_fill_setelem(struct sk_buff *skb,
4838                                   const struct nft_set *set,
4839                                   const struct nft_set_elem *elem)
4840 {
4841         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4842         unsigned char *b = skb_tail_pointer(skb);
4843         struct nlattr *nest;
4844
4845         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4846         if (nest == NULL)
4847                 goto nla_put_failure;
4848
4849         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4850             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4851                           NFT_DATA_VALUE, set->klen) < 0)
4852                 goto nla_put_failure;
4853
4854         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4855             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4856                           NFT_DATA_VALUE, set->klen) < 0)
4857                 goto nla_put_failure;
4858
4859         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4860             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4861                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4862                           set->dlen) < 0)
4863                 goto nla_put_failure;
4864
4865         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4866             nft_set_elem_expr_dump(skb, set, ext))
4867                 goto nla_put_failure;
4868
4869         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4870             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4871                            (*nft_set_ext_obj(ext))->key.name) < 0)
4872                 goto nla_put_failure;
4873
4874         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4875             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4876                          htonl(*nft_set_ext_flags(ext))))
4877                 goto nla_put_failure;
4878
4879         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4880             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4881                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4882                          NFTA_SET_ELEM_PAD))
4883                 goto nla_put_failure;
4884
4885         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4886                 u64 expires, now = get_jiffies_64();
4887
4888                 expires = *nft_set_ext_expiration(ext);
4889                 if (time_before64(now, expires))
4890                         expires -= now;
4891                 else
4892                         expires = 0;
4893
4894                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4895                                  nf_jiffies64_to_msecs(expires),
4896                                  NFTA_SET_ELEM_PAD))
4897                         goto nla_put_failure;
4898         }
4899
4900         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4901                 struct nft_userdata *udata;
4902
4903                 udata = nft_set_ext_userdata(ext);
4904                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4905                             udata->len + 1, udata->data))
4906                         goto nla_put_failure;
4907         }
4908
4909         nla_nest_end(skb, nest);
4910         return 0;
4911
4912 nla_put_failure:
4913         nlmsg_trim(skb, b);
4914         return -EMSGSIZE;
4915 }
4916
4917 struct nft_set_dump_args {
4918         const struct netlink_callback   *cb;
4919         struct nft_set_iter             iter;
4920         struct sk_buff                  *skb;
4921 };
4922
4923 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4924                                   struct nft_set *set,
4925                                   const struct nft_set_iter *iter,
4926                                   struct nft_set_elem *elem)
4927 {
4928         struct nft_set_dump_args *args;
4929
4930         args = container_of(iter, struct nft_set_dump_args, iter);
4931         return nf_tables_fill_setelem(args->skb, set, elem);
4932 }
4933
4934 struct nft_set_dump_ctx {
4935         const struct nft_set    *set;
4936         struct nft_ctx          ctx;
4937 };
4938
4939 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4940                                  const struct nft_set *set)
4941 {
4942         struct nft_set_elem_catchall *catchall;
4943         u8 genmask = nft_genmask_cur(net);
4944         struct nft_set_elem elem;
4945         struct nft_set_ext *ext;
4946         int ret = 0;
4947
4948         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4949                 ext = nft_set_elem_ext(set, catchall->elem);
4950                 if (!nft_set_elem_active(ext, genmask) ||
4951                     nft_set_elem_expired(ext))
4952                         continue;
4953
4954                 elem.priv = catchall->elem;
4955                 ret = nf_tables_fill_setelem(skb, set, &elem);
4956                 break;
4957         }
4958
4959         return ret;
4960 }
4961
4962 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4963 {
4964         struct nft_set_dump_ctx *dump_ctx = cb->data;
4965         struct net *net = sock_net(skb->sk);
4966         struct nftables_pernet *nft_net;
4967         struct nft_table *table;
4968         struct nft_set *set;
4969         struct nft_set_dump_args args;
4970         bool set_found = false;
4971         struct nlmsghdr *nlh;
4972         struct nlattr *nest;
4973         u32 portid, seq;
4974         int event;
4975
4976         rcu_read_lock();
4977         nft_net = nft_pernet(net);
4978         cb->seq = READ_ONCE(nft_net->base_seq);
4979
4980         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4981                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4982                     dump_ctx->ctx.family != table->family)
4983                         continue;
4984
4985                 if (table != dump_ctx->ctx.table)
4986                         continue;
4987
4988                 list_for_each_entry_rcu(set, &table->sets, list) {
4989                         if (set == dump_ctx->set) {
4990                                 set_found = true;
4991                                 break;
4992                         }
4993                 }
4994                 break;
4995         }
4996
4997         if (!set_found) {
4998                 rcu_read_unlock();
4999                 return -ENOENT;
5000         }
5001
5002         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5003         portid = NETLINK_CB(cb->skb).portid;
5004         seq    = cb->nlh->nlmsg_seq;
5005
5006         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5007                            table->family, NFNETLINK_V0, nft_base_seq(net));
5008         if (!nlh)
5009                 goto nla_put_failure;
5010
5011         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5012                 goto nla_put_failure;
5013         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5014                 goto nla_put_failure;
5015
5016         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5017         if (nest == NULL)
5018                 goto nla_put_failure;
5019
5020         args.cb                 = cb;
5021         args.skb                = skb;
5022         args.iter.genmask       = nft_genmask_cur(net);
5023         args.iter.skip          = cb->args[0];
5024         args.iter.count         = 0;
5025         args.iter.err           = 0;
5026         args.iter.fn            = nf_tables_dump_setelem;
5027         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5028
5029         if (!args.iter.err && args.iter.count == cb->args[0])
5030                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5031         rcu_read_unlock();
5032
5033         nla_nest_end(skb, nest);
5034         nlmsg_end(skb, nlh);
5035
5036         if (args.iter.err && args.iter.err != -EMSGSIZE)
5037                 return args.iter.err;
5038         if (args.iter.count == cb->args[0])
5039                 return 0;
5040
5041         cb->args[0] = args.iter.count;
5042         return skb->len;
5043
5044 nla_put_failure:
5045         rcu_read_unlock();
5046         return -ENOSPC;
5047 }
5048
5049 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5050 {
5051         struct nft_set_dump_ctx *dump_ctx = cb->data;
5052
5053         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5054
5055         return cb->data ? 0 : -ENOMEM;
5056 }
5057
5058 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5059 {
5060         kfree(cb->data);
5061         return 0;
5062 }
5063
5064 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5065                                        const struct nft_ctx *ctx, u32 seq,
5066                                        u32 portid, int event, u16 flags,
5067                                        const struct nft_set *set,
5068                                        const struct nft_set_elem *elem)
5069 {
5070         struct nlmsghdr *nlh;
5071         struct nlattr *nest;
5072         int err;
5073
5074         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5075         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5076                            NFNETLINK_V0, nft_base_seq(ctx->net));
5077         if (!nlh)
5078                 goto nla_put_failure;
5079
5080         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5081                 goto nla_put_failure;
5082         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5083                 goto nla_put_failure;
5084
5085         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5086         if (nest == NULL)
5087                 goto nla_put_failure;
5088
5089         err = nf_tables_fill_setelem(skb, set, elem);
5090         if (err < 0)
5091                 goto nla_put_failure;
5092
5093         nla_nest_end(skb, nest);
5094
5095         nlmsg_end(skb, nlh);
5096         return 0;
5097
5098 nla_put_failure:
5099         nlmsg_trim(skb, nlh);
5100         return -1;
5101 }
5102
5103 static int nft_setelem_parse_flags(const struct nft_set *set,
5104                                    const struct nlattr *attr, u32 *flags)
5105 {
5106         if (attr == NULL)
5107                 return 0;
5108
5109         *flags = ntohl(nla_get_be32(attr));
5110         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5111                 return -EOPNOTSUPP;
5112         if (!(set->flags & NFT_SET_INTERVAL) &&
5113             *flags & NFT_SET_ELEM_INTERVAL_END)
5114                 return -EINVAL;
5115         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5116             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5117                 return -EINVAL;
5118
5119         return 0;
5120 }
5121
5122 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5123                                  struct nft_data *key, struct nlattr *attr)
5124 {
5125         struct nft_data_desc desc = {
5126                 .type   = NFT_DATA_VALUE,
5127                 .size   = NFT_DATA_VALUE_MAXLEN,
5128                 .len    = set->klen,
5129         };
5130
5131         return nft_data_init(ctx, key, &desc, attr);
5132 }
5133
5134 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5135                                   struct nft_data_desc *desc,
5136                                   struct nft_data *data,
5137                                   struct nlattr *attr)
5138 {
5139         u32 dtype;
5140
5141         if (set->dtype == NFT_DATA_VERDICT)
5142                 dtype = NFT_DATA_VERDICT;
5143         else
5144                 dtype = NFT_DATA_VALUE;
5145
5146         desc->type = dtype;
5147         desc->size = NFT_DATA_VALUE_MAXLEN;
5148         desc->len = set->dlen;
5149         desc->flags = NFT_DATA_DESC_SETELEM;
5150
5151         return nft_data_init(ctx, data, desc, attr);
5152 }
5153
5154 static void *nft_setelem_catchall_get(const struct net *net,
5155                                       const struct nft_set *set)
5156 {
5157         struct nft_set_elem_catchall *catchall;
5158         u8 genmask = nft_genmask_cur(net);
5159         struct nft_set_ext *ext;
5160         void *priv = NULL;
5161
5162         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5163                 ext = nft_set_elem_ext(set, catchall->elem);
5164                 if (!nft_set_elem_active(ext, genmask) ||
5165                     nft_set_elem_expired(ext))
5166                         continue;
5167
5168                 priv = catchall->elem;
5169                 break;
5170         }
5171
5172         return priv;
5173 }
5174
5175 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5176                            struct nft_set_elem *elem, u32 flags)
5177 {
5178         void *priv;
5179
5180         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5181                 priv = set->ops->get(ctx->net, set, elem, flags);
5182                 if (IS_ERR(priv))
5183                         return PTR_ERR(priv);
5184         } else {
5185                 priv = nft_setelem_catchall_get(ctx->net, set);
5186                 if (!priv)
5187                         return -ENOENT;
5188         }
5189         elem->priv = priv;
5190
5191         return 0;
5192 }
5193
5194 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5195                             const struct nlattr *attr)
5196 {
5197         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5198         struct nft_set_elem elem;
5199         struct sk_buff *skb;
5200         uint32_t flags = 0;
5201         int err;
5202
5203         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5204                                           nft_set_elem_policy, NULL);
5205         if (err < 0)
5206                 return err;
5207
5208         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5209         if (err < 0)
5210                 return err;
5211
5212         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5213                 return -EINVAL;
5214
5215         if (nla[NFTA_SET_ELEM_KEY]) {
5216                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5217                                             nla[NFTA_SET_ELEM_KEY]);
5218                 if (err < 0)
5219                         return err;
5220         }
5221
5222         if (nla[NFTA_SET_ELEM_KEY_END]) {
5223                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5224                                             nla[NFTA_SET_ELEM_KEY_END]);
5225                 if (err < 0)
5226                         return err;
5227         }
5228
5229         err = nft_setelem_get(ctx, set, &elem, flags);
5230         if (err < 0)
5231                 return err;
5232
5233         err = -ENOMEM;
5234         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5235         if (skb == NULL)
5236                 return err;
5237
5238         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5239                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5240         if (err < 0)
5241                 goto err_fill_setelem;
5242
5243         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5244
5245 err_fill_setelem:
5246         kfree_skb(skb);
5247         return err;
5248 }
5249
5250 /* called with rcu_read_lock held */
5251 static int nf_tables_getsetelem(struct sk_buff *skb,
5252                                 const struct nfnl_info *info,
5253                                 const struct nlattr * const nla[])
5254 {
5255         struct netlink_ext_ack *extack = info->extack;
5256         u8 genmask = nft_genmask_cur(info->net);
5257         u8 family = info->nfmsg->nfgen_family;
5258         struct net *net = info->net;
5259         struct nft_table *table;
5260         struct nft_set *set;
5261         struct nlattr *attr;
5262         struct nft_ctx ctx;
5263         int rem, err = 0;
5264
5265         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5266                                  genmask, NETLINK_CB(skb).portid);
5267         if (IS_ERR(table)) {
5268                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5269                 return PTR_ERR(table);
5270         }
5271
5272         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5273         if (IS_ERR(set))
5274                 return PTR_ERR(set);
5275
5276         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5277
5278         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5279                 struct netlink_dump_control c = {
5280                         .start = nf_tables_dump_set_start,
5281                         .dump = nf_tables_dump_set,
5282                         .done = nf_tables_dump_set_done,
5283                         .module = THIS_MODULE,
5284                 };
5285                 struct nft_set_dump_ctx dump_ctx = {
5286                         .set = set,
5287                         .ctx = ctx,
5288                 };
5289
5290                 c.data = &dump_ctx;
5291                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5292         }
5293
5294         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5295                 return -EINVAL;
5296
5297         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5298                 err = nft_get_set_elem(&ctx, set, attr);
5299                 if (err < 0)
5300                         break;
5301         }
5302
5303         return err;
5304 }
5305
5306 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5307                                      const struct nft_set *set,
5308                                      const struct nft_set_elem *elem,
5309                                      int event)
5310 {
5311         struct nftables_pernet *nft_net;
5312         struct net *net = ctx->net;
5313         u32 portid = ctx->portid;
5314         struct sk_buff *skb;
5315         u16 flags = 0;
5316         int err;
5317
5318         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5319                 return;
5320
5321         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5322         if (skb == NULL)
5323                 goto err;
5324
5325         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5326                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5327
5328         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5329                                           set, elem);
5330         if (err < 0) {
5331                 kfree_skb(skb);
5332                 goto err;
5333         }
5334
5335         nft_net = nft_pernet(net);
5336         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5337         return;
5338 err:
5339         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5340 }
5341
5342 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5343                                               int msg_type,
5344                                               struct nft_set *set)
5345 {
5346         struct nft_trans *trans;
5347
5348         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5349         if (trans == NULL)
5350                 return NULL;
5351
5352         nft_trans_elem_set(trans) = set;
5353         return trans;
5354 }
5355
5356 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5357                                          const struct nft_set *set,
5358                                          const struct nlattr *attr)
5359 {
5360         struct nft_expr *expr;
5361         int err;
5362
5363         expr = nft_expr_init(ctx, attr);
5364         if (IS_ERR(expr))
5365                 return expr;
5366
5367         err = -EOPNOTSUPP;
5368         if (expr->ops->type->flags & NFT_EXPR_GC) {
5369                 if (set->flags & NFT_SET_TIMEOUT)
5370                         goto err_set_elem_expr;
5371                 if (!set->ops->gc_init)
5372                         goto err_set_elem_expr;
5373                 set->ops->gc_init(set);
5374         }
5375
5376         return expr;
5377
5378 err_set_elem_expr:
5379         nft_expr_destroy(ctx, expr);
5380         return ERR_PTR(err);
5381 }
5382
5383 void *nft_set_elem_init(const struct nft_set *set,
5384                         const struct nft_set_ext_tmpl *tmpl,
5385                         const u32 *key, const u32 *key_end,
5386                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5387 {
5388         struct nft_set_ext *ext;
5389         void *elem;
5390
5391         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5392         if (elem == NULL)
5393                 return NULL;
5394
5395         ext = nft_set_elem_ext(set, elem);
5396         nft_set_ext_init(ext, tmpl);
5397
5398         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5399                 memcpy(nft_set_ext_key(ext), key, set->klen);
5400         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5401                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5402         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5403                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5404         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5405                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5406                 if (expiration == 0)
5407                         *nft_set_ext_expiration(ext) += timeout;
5408         }
5409         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5410                 *nft_set_ext_timeout(ext) = timeout;
5411
5412         return elem;
5413 }
5414
5415 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5416                                         struct nft_expr *expr)
5417 {
5418         if (expr->ops->destroy_clone) {
5419                 expr->ops->destroy_clone(ctx, expr);
5420                 module_put(expr->ops->type->owner);
5421         } else {
5422                 nf_tables_expr_destroy(ctx, expr);
5423         }
5424 }
5425
5426 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5427                                       struct nft_set_elem_expr *elem_expr)
5428 {
5429         struct nft_expr *expr;
5430         u32 size;
5431
5432         nft_setelem_expr_foreach(expr, elem_expr, size)
5433                 __nft_set_elem_expr_destroy(ctx, expr);
5434 }
5435
5436 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5437                           bool destroy_expr)
5438 {
5439         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5440         struct nft_ctx ctx = {
5441                 .net    = read_pnet(&set->net),
5442                 .family = set->table->family,
5443         };
5444
5445         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5446         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5447                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5448         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5449                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5450
5451         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5452                 (*nft_set_ext_obj(ext))->use--;
5453         kfree(elem);
5454 }
5455 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5456
5457 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5458  * with the refcounting from the preparation phase.
5459  */
5460 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5461                                        const struct nft_set *set, void *elem)
5462 {
5463         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5464
5465         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5466                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5467
5468         kfree(elem);
5469 }
5470
5471 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5472                             struct nft_expr *expr_array[])
5473 {
5474         struct nft_expr *expr;
5475         int err, i, k;
5476
5477         for (i = 0; i < set->num_exprs; i++) {
5478                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5479                 if (!expr)
5480                         goto err_expr;
5481
5482                 err = nft_expr_clone(expr, set->exprs[i]);
5483                 if (err < 0) {
5484                         kfree(expr);
5485                         goto err_expr;
5486                 }
5487                 expr_array[i] = expr;
5488         }
5489
5490         return 0;
5491
5492 err_expr:
5493         for (k = i - 1; k >= 0; k--)
5494                 nft_expr_destroy(ctx, expr_array[k]);
5495
5496         return -ENOMEM;
5497 }
5498
5499 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5500                                    const struct nft_set_ext *ext,
5501                                    struct nft_expr *expr_array[],
5502                                    u32 num_exprs)
5503 {
5504         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5505         struct nft_expr *expr;
5506         int i, err;
5507
5508         for (i = 0; i < num_exprs; i++) {
5509                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5510                 err = nft_expr_clone(expr, expr_array[i]);
5511                 if (err < 0)
5512                         goto err_elem_expr_setup;
5513
5514                 elem_expr->size += expr_array[i]->ops->size;
5515                 nft_expr_destroy(ctx, expr_array[i]);
5516                 expr_array[i] = NULL;
5517         }
5518
5519         return 0;
5520
5521 err_elem_expr_setup:
5522         for (; i < num_exprs; i++) {
5523                 nft_expr_destroy(ctx, expr_array[i]);
5524                 expr_array[i] = NULL;
5525         }
5526
5527         return -ENOMEM;
5528 }
5529
5530 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5531                                             const struct nft_set *set)
5532 {
5533         struct nft_set_elem_catchall *catchall;
5534         u8 genmask = nft_genmask_cur(net);
5535         struct nft_set_ext *ext;
5536
5537         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5538                 ext = nft_set_elem_ext(set, catchall->elem);
5539                 if (nft_set_elem_active(ext, genmask) &&
5540                     !nft_set_elem_expired(ext))
5541                         return ext;
5542         }
5543
5544         return NULL;
5545 }
5546 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5547
5548 void *nft_set_catchall_gc(const struct nft_set *set)
5549 {
5550         struct nft_set_elem_catchall *catchall, *next;
5551         struct nft_set_ext *ext;
5552         void *elem = NULL;
5553
5554         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5555                 ext = nft_set_elem_ext(set, catchall->elem);
5556
5557                 if (!nft_set_elem_expired(ext) ||
5558                     nft_set_elem_mark_busy(ext))
5559                         continue;
5560
5561                 elem = catchall->elem;
5562                 list_del_rcu(&catchall->list);
5563                 kfree_rcu(catchall, rcu);
5564                 break;
5565         }
5566
5567         return elem;
5568 }
5569 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5570
5571 static int nft_setelem_catchall_insert(const struct net *net,
5572                                        struct nft_set *set,
5573                                        const struct nft_set_elem *elem,
5574                                        struct nft_set_ext **pext)
5575 {
5576         struct nft_set_elem_catchall *catchall;
5577         u8 genmask = nft_genmask_next(net);
5578         struct nft_set_ext *ext;
5579
5580         list_for_each_entry(catchall, &set->catchall_list, list) {
5581                 ext = nft_set_elem_ext(set, catchall->elem);
5582                 if (nft_set_elem_active(ext, genmask)) {
5583                         *pext = ext;
5584                         return -EEXIST;
5585                 }
5586         }
5587
5588         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5589         if (!catchall)
5590                 return -ENOMEM;
5591
5592         catchall->elem = elem->priv;
5593         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5594
5595         return 0;
5596 }
5597
5598 static int nft_setelem_insert(const struct net *net,
5599                               struct nft_set *set,
5600                               const struct nft_set_elem *elem,
5601                               struct nft_set_ext **ext, unsigned int flags)
5602 {
5603         int ret;
5604
5605         if (flags & NFT_SET_ELEM_CATCHALL)
5606                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5607         else
5608                 ret = set->ops->insert(net, set, elem, ext);
5609
5610         return ret;
5611 }
5612
5613 static bool nft_setelem_is_catchall(const struct nft_set *set,
5614                                     const struct nft_set_elem *elem)
5615 {
5616         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5617
5618         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5619             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5620                 return true;
5621
5622         return false;
5623 }
5624
5625 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5626                                  struct nft_set_elem *elem)
5627 {
5628         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5629
5630         if (nft_setelem_is_catchall(set, elem)) {
5631                 nft_set_elem_change_active(net, set, ext);
5632                 nft_set_elem_clear_busy(ext);
5633         } else {
5634                 set->ops->activate(net, set, elem);
5635         }
5636 }
5637
5638 static int nft_setelem_catchall_deactivate(const struct net *net,
5639                                            struct nft_set *set,
5640                                            struct nft_set_elem *elem)
5641 {
5642         struct nft_set_elem_catchall *catchall;
5643         struct nft_set_ext *ext;
5644
5645         list_for_each_entry(catchall, &set->catchall_list, list) {
5646                 ext = nft_set_elem_ext(set, catchall->elem);
5647                 if (!nft_is_active(net, ext) ||
5648                     nft_set_elem_mark_busy(ext))
5649                         continue;
5650
5651                 kfree(elem->priv);
5652                 elem->priv = catchall->elem;
5653                 nft_set_elem_change_active(net, set, ext);
5654                 return 0;
5655         }
5656
5657         return -ENOENT;
5658 }
5659
5660 static int __nft_setelem_deactivate(const struct net *net,
5661                                     struct nft_set *set,
5662                                     struct nft_set_elem *elem)
5663 {
5664         void *priv;
5665
5666         priv = set->ops->deactivate(net, set, elem);
5667         if (!priv)
5668                 return -ENOENT;
5669
5670         kfree(elem->priv);
5671         elem->priv = priv;
5672         set->ndeact++;
5673
5674         return 0;
5675 }
5676
5677 static int nft_setelem_deactivate(const struct net *net,
5678                                   struct nft_set *set,
5679                                   struct nft_set_elem *elem, u32 flags)
5680 {
5681         int ret;
5682
5683         if (flags & NFT_SET_ELEM_CATCHALL)
5684                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5685         else
5686                 ret = __nft_setelem_deactivate(net, set, elem);
5687
5688         return ret;
5689 }
5690
5691 static void nft_setelem_catchall_remove(const struct net *net,
5692                                         const struct nft_set *set,
5693                                         const struct nft_set_elem *elem)
5694 {
5695         struct nft_set_elem_catchall *catchall, *next;
5696
5697         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5698                 if (catchall->elem == elem->priv) {
5699                         list_del_rcu(&catchall->list);
5700                         kfree_rcu(catchall, rcu);
5701                         break;
5702                 }
5703         }
5704 }
5705
5706 static void nft_setelem_remove(const struct net *net,
5707                                const struct nft_set *set,
5708                                const struct nft_set_elem *elem)
5709 {
5710         if (nft_setelem_is_catchall(set, elem))
5711                 nft_setelem_catchall_remove(net, set, elem);
5712         else
5713                 set->ops->remove(net, set, elem);
5714 }
5715
5716 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5717                                       struct nlattr **nla, u32 flags)
5718 {
5719         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5720                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5721                 if (flags & NFT_SET_ELEM_INTERVAL_END)
5722                         return false;
5723                 if (!nla[NFTA_SET_ELEM_KEY_END] &&
5724                     !(flags & NFT_SET_ELEM_CATCHALL))
5725                         return false;
5726         } else {
5727                 if (nla[NFTA_SET_ELEM_KEY_END])
5728                         return false;
5729         }
5730
5731         return true;
5732 }
5733
5734 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5735                             const struct nlattr *attr, u32 nlmsg_flags)
5736 {
5737         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5738         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5739         u8 genmask = nft_genmask_next(ctx->net);
5740         u32 flags = 0, size = 0, num_exprs = 0;
5741         struct nft_set_ext_tmpl tmpl;
5742         struct nft_set_ext *ext, *ext2;
5743         struct nft_set_elem elem;
5744         struct nft_set_binding *binding;
5745         struct nft_object *obj = NULL;
5746         struct nft_userdata *udata;
5747         struct nft_data_desc desc;
5748         enum nft_registers dreg;
5749         struct nft_trans *trans;
5750         u64 timeout;
5751         u64 expiration;
5752         int err, i;
5753         u8 ulen;
5754
5755         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5756                                           nft_set_elem_policy, NULL);
5757         if (err < 0)
5758                 return err;
5759
5760         nft_set_ext_prepare(&tmpl);
5761
5762         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5763         if (err < 0)
5764                 return err;
5765
5766         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5767                 return -EINVAL;
5768
5769         if (flags != 0) {
5770                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5771                 if (err < 0)
5772                         return err;
5773         }
5774
5775         if (set->flags & NFT_SET_MAP) {
5776                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5777                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5778                         return -EINVAL;
5779         } else {
5780                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5781                         return -EINVAL;
5782         }
5783
5784         if (set->flags & NFT_SET_OBJECT) {
5785                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
5786                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5787                         return -EINVAL;
5788         } else {
5789                 if (nla[NFTA_SET_ELEM_OBJREF])
5790                         return -EINVAL;
5791         }
5792
5793         if (!nft_setelem_valid_key_end(set, nla, flags))
5794                 return -EINVAL;
5795
5796         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5797              (nla[NFTA_SET_ELEM_DATA] ||
5798               nla[NFTA_SET_ELEM_OBJREF] ||
5799               nla[NFTA_SET_ELEM_TIMEOUT] ||
5800               nla[NFTA_SET_ELEM_EXPIRATION] ||
5801               nla[NFTA_SET_ELEM_USERDATA] ||
5802               nla[NFTA_SET_ELEM_EXPR] ||
5803               nla[NFTA_SET_ELEM_KEY_END] ||
5804               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5805                 return -EINVAL;
5806
5807         timeout = 0;
5808         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5809                 if (!(set->flags & NFT_SET_TIMEOUT))
5810                         return -EINVAL;
5811                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5812                                             &timeout);
5813                 if (err)
5814                         return err;
5815         } else if (set->flags & NFT_SET_TIMEOUT) {
5816                 timeout = set->timeout;
5817         }
5818
5819         expiration = 0;
5820         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5821                 if (!(set->flags & NFT_SET_TIMEOUT))
5822                         return -EINVAL;
5823                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5824                                             &expiration);
5825                 if (err)
5826                         return err;
5827         }
5828
5829         if (nla[NFTA_SET_ELEM_EXPR]) {
5830                 struct nft_expr *expr;
5831
5832                 if (set->num_exprs && set->num_exprs != 1)
5833                         return -EOPNOTSUPP;
5834
5835                 expr = nft_set_elem_expr_alloc(ctx, set,
5836                                                nla[NFTA_SET_ELEM_EXPR]);
5837                 if (IS_ERR(expr))
5838                         return PTR_ERR(expr);
5839
5840                 expr_array[0] = expr;
5841                 num_exprs = 1;
5842
5843                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5844                         err = -EOPNOTSUPP;
5845                         goto err_set_elem_expr;
5846                 }
5847         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5848                 struct nft_expr *expr;
5849                 struct nlattr *tmp;
5850                 int left;
5851
5852                 i = 0;
5853                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5854                         if (i == NFT_SET_EXPR_MAX ||
5855                             (set->num_exprs && set->num_exprs == i)) {
5856                                 err = -E2BIG;
5857                                 goto err_set_elem_expr;
5858                         }
5859                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5860                                 err = -EINVAL;
5861                                 goto err_set_elem_expr;
5862                         }
5863                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5864                         if (IS_ERR(expr)) {
5865                                 err = PTR_ERR(expr);
5866                                 goto err_set_elem_expr;
5867                         }
5868                         expr_array[i] = expr;
5869                         num_exprs++;
5870
5871                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5872                                 err = -EOPNOTSUPP;
5873                                 goto err_set_elem_expr;
5874                         }
5875                         i++;
5876                 }
5877                 if (set->num_exprs && set->num_exprs != i) {
5878                         err = -EOPNOTSUPP;
5879                         goto err_set_elem_expr;
5880                 }
5881         } else if (set->num_exprs > 0) {
5882                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5883                 if (err < 0)
5884                         goto err_set_elem_expr_clone;
5885
5886                 num_exprs = set->num_exprs;
5887         }
5888
5889         if (nla[NFTA_SET_ELEM_KEY]) {
5890                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5891                                             nla[NFTA_SET_ELEM_KEY]);
5892                 if (err < 0)
5893                         goto err_set_elem_expr;
5894
5895                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5896                 if (err < 0)
5897                         goto err_parse_key;
5898         }
5899
5900         if (nla[NFTA_SET_ELEM_KEY_END]) {
5901                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5902                                             nla[NFTA_SET_ELEM_KEY_END]);
5903                 if (err < 0)
5904                         goto err_parse_key;
5905
5906                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5907                 if (err < 0)
5908                         goto err_parse_key_end;
5909         }
5910
5911         if (timeout > 0) {
5912                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5913                 if (err < 0)
5914                         goto err_parse_key_end;
5915
5916                 if (timeout != set->timeout) {
5917                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5918                         if (err < 0)
5919                                 goto err_parse_key_end;
5920                 }
5921         }
5922
5923         if (num_exprs) {
5924                 for (i = 0; i < num_exprs; i++)
5925                         size += expr_array[i]->ops->size;
5926
5927                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5928                                              sizeof(struct nft_set_elem_expr) + size);
5929                 if (err < 0)
5930                         goto err_parse_key_end;
5931         }
5932
5933         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5934                 obj = nft_obj_lookup(ctx->net, ctx->table,
5935                                      nla[NFTA_SET_ELEM_OBJREF],
5936                                      set->objtype, genmask);
5937                 if (IS_ERR(obj)) {
5938                         err = PTR_ERR(obj);
5939                         goto err_parse_key_end;
5940                 }
5941                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5942                 if (err < 0)
5943                         goto err_parse_key_end;
5944         }
5945
5946         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5947                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5948                                              nla[NFTA_SET_ELEM_DATA]);
5949                 if (err < 0)
5950                         goto err_parse_key_end;
5951
5952                 dreg = nft_type_to_reg(set->dtype);
5953                 list_for_each_entry(binding, &set->bindings, list) {
5954                         struct nft_ctx bind_ctx = {
5955                                 .net    = ctx->net,
5956                                 .family = ctx->family,
5957                                 .table  = ctx->table,
5958                                 .chain  = (struct nft_chain *)binding->chain,
5959                         };
5960
5961                         if (!(binding->flags & NFT_SET_MAP))
5962                                 continue;
5963
5964                         err = nft_validate_register_store(&bind_ctx, dreg,
5965                                                           &elem.data.val,
5966                                                           desc.type, desc.len);
5967                         if (err < 0)
5968                                 goto err_parse_data;
5969
5970                         if (desc.type == NFT_DATA_VERDICT &&
5971                             (elem.data.val.verdict.code == NFT_GOTO ||
5972                              elem.data.val.verdict.code == NFT_JUMP))
5973                                 nft_validate_state_update(ctx->net,
5974                                                           NFT_VALIDATE_NEED);
5975                 }
5976
5977                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5978                 if (err < 0)
5979                         goto err_parse_data;
5980         }
5981
5982         /* The full maximum length of userdata can exceed the maximum
5983          * offset value (U8_MAX) for following extensions, therefor it
5984          * must be the last extension added.
5985          */
5986         ulen = 0;
5987         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5988                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5989                 if (ulen > 0) {
5990                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5991                                                      ulen);
5992                         if (err < 0)
5993                                 goto err_parse_data;
5994                 }
5995         }
5996
5997         err = -ENOMEM;
5998         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5999                                       elem.key_end.val.data, elem.data.val.data,
6000                                       timeout, expiration, GFP_KERNEL);
6001         if (elem.priv == NULL)
6002                 goto err_parse_data;
6003
6004         ext = nft_set_elem_ext(set, elem.priv);
6005         if (flags)
6006                 *nft_set_ext_flags(ext) = flags;
6007         if (ulen > 0) {
6008                 udata = nft_set_ext_userdata(ext);
6009                 udata->len = ulen - 1;
6010                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6011         }
6012         if (obj) {
6013                 *nft_set_ext_obj(ext) = obj;
6014                 obj->use++;
6015         }
6016         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
6017         if (err < 0)
6018                 goto err_elem_expr;
6019
6020         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6021         if (trans == NULL) {
6022                 err = -ENOMEM;
6023                 goto err_elem_expr;
6024         }
6025
6026         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6027
6028         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6029         if (err) {
6030                 if (err == -EEXIST) {
6031                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6032                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6033                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6034                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6035                                 goto err_element_clash;
6036                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6037                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6038                              memcmp(nft_set_ext_data(ext),
6039                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6040                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6041                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6042                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6043                                 goto err_element_clash;
6044                         else if (!(nlmsg_flags & NLM_F_EXCL))
6045                                 err = 0;
6046                 } else if (err == -ENOTEMPTY) {
6047                         /* ENOTEMPTY reports overlapping between this element
6048                          * and an existing one.
6049                          */
6050                         err = -EEXIST;
6051                 }
6052                 goto err_element_clash;
6053         }
6054
6055         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6056             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6057                 err = -ENFILE;
6058                 goto err_set_full;
6059         }
6060
6061         nft_trans_elem(trans) = elem;
6062         nft_trans_commit_list_add_tail(ctx->net, trans);
6063         return 0;
6064
6065 err_set_full:
6066         nft_setelem_remove(ctx->net, set, &elem);
6067 err_element_clash:
6068         kfree(trans);
6069 err_elem_expr:
6070         if (obj)
6071                 obj->use--;
6072
6073         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6074 err_parse_data:
6075         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6076                 nft_data_release(&elem.data.val, desc.type);
6077 err_parse_key_end:
6078         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6079 err_parse_key:
6080         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6081 err_set_elem_expr:
6082         for (i = 0; i < num_exprs && expr_array[i]; i++)
6083                 nft_expr_destroy(ctx, expr_array[i]);
6084 err_set_elem_expr_clone:
6085         return err;
6086 }
6087
6088 static int nf_tables_newsetelem(struct sk_buff *skb,
6089                                 const struct nfnl_info *info,
6090                                 const struct nlattr * const nla[])
6091 {
6092         struct nftables_pernet *nft_net = nft_pernet(info->net);
6093         struct netlink_ext_ack *extack = info->extack;
6094         u8 genmask = nft_genmask_next(info->net);
6095         u8 family = info->nfmsg->nfgen_family;
6096         struct net *net = info->net;
6097         const struct nlattr *attr;
6098         struct nft_table *table;
6099         struct nft_set *set;
6100         struct nft_ctx ctx;
6101         int rem, err;
6102
6103         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6104                 return -EINVAL;
6105
6106         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6107                                  genmask, NETLINK_CB(skb).portid);
6108         if (IS_ERR(table)) {
6109                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6110                 return PTR_ERR(table);
6111         }
6112
6113         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6114                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6115         if (IS_ERR(set))
6116                 return PTR_ERR(set);
6117
6118         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6119                 return -EBUSY;
6120
6121         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6122
6123         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6124                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6125                 if (err < 0)
6126                         return err;
6127         }
6128
6129         if (nft_net->validate_state == NFT_VALIDATE_DO)
6130                 return nft_table_validate(net, table);
6131
6132         return 0;
6133 }
6134
6135 /**
6136  *      nft_data_hold - hold a nft_data item
6137  *
6138  *      @data: struct nft_data to release
6139  *      @type: type of data
6140  *
6141  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6142  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6143  *      NFT_GOTO verdicts. This function must be called on active data objects
6144  *      from the second phase of the commit protocol.
6145  */
6146 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6147 {
6148         struct nft_chain *chain;
6149         struct nft_rule *rule;
6150
6151         if (type == NFT_DATA_VERDICT) {
6152                 switch (data->verdict.code) {
6153                 case NFT_JUMP:
6154                 case NFT_GOTO:
6155                         chain = data->verdict.chain;
6156                         chain->use++;
6157
6158                         if (!nft_chain_is_bound(chain))
6159                                 break;
6160
6161                         chain->table->use++;
6162                         list_for_each_entry(rule, &chain->rules, list)
6163                                 chain->use++;
6164
6165                         nft_chain_add(chain->table, chain);
6166                         break;
6167                 }
6168         }
6169 }
6170
6171 static void nft_setelem_data_activate(const struct net *net,
6172                                       const struct nft_set *set,
6173                                       struct nft_set_elem *elem)
6174 {
6175         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6176
6177         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6178                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6179         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6180                 (*nft_set_ext_obj(ext))->use++;
6181 }
6182
6183 static void nft_setelem_data_deactivate(const struct net *net,
6184                                         const struct nft_set *set,
6185                                         struct nft_set_elem *elem)
6186 {
6187         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6188
6189         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6190                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6191         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6192                 (*nft_set_ext_obj(ext))->use--;
6193 }
6194
6195 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6196                            const struct nlattr *attr)
6197 {
6198         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6199         struct nft_set_ext_tmpl tmpl;
6200         struct nft_set_elem elem;
6201         struct nft_set_ext *ext;
6202         struct nft_trans *trans;
6203         u32 flags = 0;
6204         int err;
6205
6206         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6207                                           nft_set_elem_policy, NULL);
6208         if (err < 0)
6209                 return err;
6210
6211         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6212         if (err < 0)
6213                 return err;
6214
6215         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6216                 return -EINVAL;
6217
6218         if (!nft_setelem_valid_key_end(set, nla, flags))
6219                 return -EINVAL;
6220
6221         nft_set_ext_prepare(&tmpl);
6222
6223         if (flags != 0) {
6224                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6225                 if (err < 0)
6226                         return err;
6227         }
6228
6229         if (nla[NFTA_SET_ELEM_KEY]) {
6230                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6231                                             nla[NFTA_SET_ELEM_KEY]);
6232                 if (err < 0)
6233                         return err;
6234
6235                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6236                 if (err < 0)
6237                         goto fail_elem;
6238         }
6239
6240         if (nla[NFTA_SET_ELEM_KEY_END]) {
6241                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6242                                             nla[NFTA_SET_ELEM_KEY_END]);
6243                 if (err < 0)
6244                         goto fail_elem;
6245
6246                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6247                 if (err < 0)
6248                         goto fail_elem_key_end;
6249         }
6250
6251         err = -ENOMEM;
6252         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6253                                       elem.key_end.val.data, NULL, 0, 0,
6254                                       GFP_KERNEL);
6255         if (elem.priv == NULL)
6256                 goto fail_elem_key_end;
6257
6258         ext = nft_set_elem_ext(set, elem.priv);
6259         if (flags)
6260                 *nft_set_ext_flags(ext) = flags;
6261
6262         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6263         if (trans == NULL)
6264                 goto fail_trans;
6265
6266         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6267         if (err < 0)
6268                 goto fail_ops;
6269
6270         nft_setelem_data_deactivate(ctx->net, set, &elem);
6271
6272         nft_trans_elem(trans) = elem;
6273         nft_trans_commit_list_add_tail(ctx->net, trans);
6274         return 0;
6275
6276 fail_ops:
6277         kfree(trans);
6278 fail_trans:
6279         kfree(elem.priv);
6280 fail_elem_key_end:
6281         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6282 fail_elem:
6283         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6284         return err;
6285 }
6286
6287 static int nft_setelem_flush(const struct nft_ctx *ctx,
6288                              struct nft_set *set,
6289                              const struct nft_set_iter *iter,
6290                              struct nft_set_elem *elem)
6291 {
6292         struct nft_trans *trans;
6293         int err;
6294
6295         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6296                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6297         if (!trans)
6298                 return -ENOMEM;
6299
6300         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6301                 err = -ENOENT;
6302                 goto err1;
6303         }
6304         set->ndeact++;
6305
6306         nft_setelem_data_deactivate(ctx->net, set, elem);
6307         nft_trans_elem_set(trans) = set;
6308         nft_trans_elem(trans) = *elem;
6309         nft_trans_commit_list_add_tail(ctx->net, trans);
6310
6311         return 0;
6312 err1:
6313         kfree(trans);
6314         return err;
6315 }
6316
6317 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6318                                     struct nft_set *set,
6319                                     struct nft_set_elem *elem)
6320 {
6321         struct nft_trans *trans;
6322
6323         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6324                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6325         if (!trans)
6326                 return -ENOMEM;
6327
6328         nft_setelem_data_deactivate(ctx->net, set, elem);
6329         nft_trans_elem_set(trans) = set;
6330         nft_trans_elem(trans) = *elem;
6331         nft_trans_commit_list_add_tail(ctx->net, trans);
6332
6333         return 0;
6334 }
6335
6336 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6337                                   struct nft_set *set)
6338 {
6339         u8 genmask = nft_genmask_next(ctx->net);
6340         struct nft_set_elem_catchall *catchall;
6341         struct nft_set_elem elem;
6342         struct nft_set_ext *ext;
6343         int ret = 0;
6344
6345         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6346                 ext = nft_set_elem_ext(set, catchall->elem);
6347                 if (!nft_set_elem_active(ext, genmask) ||
6348                     nft_set_elem_mark_busy(ext))
6349                         continue;
6350
6351                 elem.priv = catchall->elem;
6352                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6353                 if (ret < 0)
6354                         break;
6355         }
6356
6357         return ret;
6358 }
6359
6360 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6361 {
6362         struct nft_set_iter iter = {
6363                 .genmask        = genmask,
6364                 .fn             = nft_setelem_flush,
6365         };
6366
6367         set->ops->walk(ctx, set, &iter);
6368         if (!iter.err)
6369                 iter.err = nft_set_catchall_flush(ctx, set);
6370
6371         return iter.err;
6372 }
6373
6374 static int nf_tables_delsetelem(struct sk_buff *skb,
6375                                 const struct nfnl_info *info,
6376                                 const struct nlattr * const nla[])
6377 {
6378         struct netlink_ext_ack *extack = info->extack;
6379         u8 genmask = nft_genmask_next(info->net);
6380         u8 family = info->nfmsg->nfgen_family;
6381         struct net *net = info->net;
6382         const struct nlattr *attr;
6383         struct nft_table *table;
6384         struct nft_set *set;
6385         struct nft_ctx ctx;
6386         int rem, err = 0;
6387
6388         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6389                                  genmask, NETLINK_CB(skb).portid);
6390         if (IS_ERR(table)) {
6391                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6392                 return PTR_ERR(table);
6393         }
6394
6395         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6396         if (IS_ERR(set))
6397                 return PTR_ERR(set);
6398         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6399                 return -EBUSY;
6400
6401         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6402
6403         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6404                 return nft_set_flush(&ctx, set, genmask);
6405
6406         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6407                 err = nft_del_setelem(&ctx, set, attr);
6408                 if (err < 0)
6409                         break;
6410         }
6411         return err;
6412 }
6413
6414 void nft_set_gc_batch_release(struct rcu_head *rcu)
6415 {
6416         struct nft_set_gc_batch *gcb;
6417         unsigned int i;
6418
6419         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6420         for (i = 0; i < gcb->head.cnt; i++)
6421                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6422         kfree(gcb);
6423 }
6424
6425 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6426                                                 gfp_t gfp)
6427 {
6428         struct nft_set_gc_batch *gcb;
6429
6430         gcb = kzalloc(sizeof(*gcb), gfp);
6431         if (gcb == NULL)
6432                 return gcb;
6433         gcb->head.set = set;
6434         return gcb;
6435 }
6436
6437 /*
6438  * Stateful objects
6439  */
6440
6441 /**
6442  *      nft_register_obj- register nf_tables stateful object type
6443  *      @obj_type: object type
6444  *
6445  *      Registers the object type for use with nf_tables. Returns zero on
6446  *      success or a negative errno code otherwise.
6447  */
6448 int nft_register_obj(struct nft_object_type *obj_type)
6449 {
6450         if (obj_type->type == NFT_OBJECT_UNSPEC)
6451                 return -EINVAL;
6452
6453         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6454         list_add_rcu(&obj_type->list, &nf_tables_objects);
6455         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6456         return 0;
6457 }
6458 EXPORT_SYMBOL_GPL(nft_register_obj);
6459
6460 /**
6461  *      nft_unregister_obj - unregister nf_tables object type
6462  *      @obj_type: object type
6463  *
6464  *      Unregisters the object type for use with nf_tables.
6465  */
6466 void nft_unregister_obj(struct nft_object_type *obj_type)
6467 {
6468         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6469         list_del_rcu(&obj_type->list);
6470         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6471 }
6472 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6473
6474 struct nft_object *nft_obj_lookup(const struct net *net,
6475                                   const struct nft_table *table,
6476                                   const struct nlattr *nla, u32 objtype,
6477                                   u8 genmask)
6478 {
6479         struct nft_object_hash_key k = { .table = table };
6480         char search[NFT_OBJ_MAXNAMELEN];
6481         struct rhlist_head *tmp, *list;
6482         struct nft_object *obj;
6483
6484         nla_strscpy(search, nla, sizeof(search));
6485         k.name = search;
6486
6487         WARN_ON_ONCE(!rcu_read_lock_held() &&
6488                      !lockdep_commit_lock_is_held(net));
6489
6490         rcu_read_lock();
6491         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6492         if (!list)
6493                 goto out;
6494
6495         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6496                 if (objtype == obj->ops->type->type &&
6497                     nft_active_genmask(obj, genmask)) {
6498                         rcu_read_unlock();
6499                         return obj;
6500                 }
6501         }
6502 out:
6503         rcu_read_unlock();
6504         return ERR_PTR(-ENOENT);
6505 }
6506 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6507
6508 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6509                                                   const struct nlattr *nla,
6510                                                   u32 objtype, u8 genmask)
6511 {
6512         struct nft_object *obj;
6513
6514         list_for_each_entry(obj, &table->objects, list) {
6515                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6516                     objtype == obj->ops->type->type &&
6517                     nft_active_genmask(obj, genmask))
6518                         return obj;
6519         }
6520         return ERR_PTR(-ENOENT);
6521 }
6522
6523 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6524         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6525                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6526         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6527                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6528         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6529         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6530         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6531         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6532                                     .len = NFT_USERDATA_MAXLEN },
6533 };
6534
6535 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6536                                        const struct nft_object_type *type,
6537                                        const struct nlattr *attr)
6538 {
6539         struct nlattr **tb;
6540         const struct nft_object_ops *ops;
6541         struct nft_object *obj;
6542         int err = -ENOMEM;
6543
6544         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6545         if (!tb)
6546                 goto err1;
6547
6548         if (attr) {
6549                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6550                                                   type->policy, NULL);
6551                 if (err < 0)
6552                         goto err2;
6553         } else {
6554                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6555         }
6556
6557         if (type->select_ops) {
6558                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6559                 if (IS_ERR(ops)) {
6560                         err = PTR_ERR(ops);
6561                         goto err2;
6562                 }
6563         } else {
6564                 ops = type->ops;
6565         }
6566
6567         err = -ENOMEM;
6568         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6569         if (!obj)
6570                 goto err2;
6571
6572         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6573         if (err < 0)
6574                 goto err3;
6575
6576         obj->ops = ops;
6577
6578         kfree(tb);
6579         return obj;
6580 err3:
6581         kfree(obj);
6582 err2:
6583         kfree(tb);
6584 err1:
6585         return ERR_PTR(err);
6586 }
6587
6588 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6589                            struct nft_object *obj, bool reset)
6590 {
6591         struct nlattr *nest;
6592
6593         nest = nla_nest_start_noflag(skb, attr);
6594         if (!nest)
6595                 goto nla_put_failure;
6596         if (obj->ops->dump(skb, obj, reset) < 0)
6597                 goto nla_put_failure;
6598         nla_nest_end(skb, nest);
6599         return 0;
6600
6601 nla_put_failure:
6602         return -1;
6603 }
6604
6605 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6606 {
6607         const struct nft_object_type *type;
6608
6609         list_for_each_entry(type, &nf_tables_objects, list) {
6610                 if (objtype == type->type)
6611                         return type;
6612         }
6613         return NULL;
6614 }
6615
6616 static const struct nft_object_type *
6617 nft_obj_type_get(struct net *net, u32 objtype)
6618 {
6619         const struct nft_object_type *type;
6620
6621         type = __nft_obj_type_get(objtype);
6622         if (type != NULL && try_module_get(type->owner))
6623                 return type;
6624
6625         lockdep_nfnl_nft_mutex_not_held();
6626 #ifdef CONFIG_MODULES
6627         if (type == NULL) {
6628                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6629                         return ERR_PTR(-EAGAIN);
6630         }
6631 #endif
6632         return ERR_PTR(-ENOENT);
6633 }
6634
6635 static int nf_tables_updobj(const struct nft_ctx *ctx,
6636                             const struct nft_object_type *type,
6637                             const struct nlattr *attr,
6638                             struct nft_object *obj)
6639 {
6640         struct nft_object *newobj;
6641         struct nft_trans *trans;
6642         int err = -ENOMEM;
6643
6644         if (!try_module_get(type->owner))
6645                 return -ENOENT;
6646
6647         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6648                                 sizeof(struct nft_trans_obj));
6649         if (!trans)
6650                 goto err_trans;
6651
6652         newobj = nft_obj_init(ctx, type, attr);
6653         if (IS_ERR(newobj)) {
6654                 err = PTR_ERR(newobj);
6655                 goto err_free_trans;
6656         }
6657
6658         nft_trans_obj(trans) = obj;
6659         nft_trans_obj_update(trans) = true;
6660         nft_trans_obj_newobj(trans) = newobj;
6661         nft_trans_commit_list_add_tail(ctx->net, trans);
6662
6663         return 0;
6664
6665 err_free_trans:
6666         kfree(trans);
6667 err_trans:
6668         module_put(type->owner);
6669         return err;
6670 }
6671
6672 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6673                             const struct nlattr * const nla[])
6674 {
6675         struct netlink_ext_ack *extack = info->extack;
6676         u8 genmask = nft_genmask_next(info->net);
6677         u8 family = info->nfmsg->nfgen_family;
6678         const struct nft_object_type *type;
6679         struct net *net = info->net;
6680         struct nft_table *table;
6681         struct nft_object *obj;
6682         struct nft_ctx ctx;
6683         u32 objtype;
6684         int err;
6685
6686         if (!nla[NFTA_OBJ_TYPE] ||
6687             !nla[NFTA_OBJ_NAME] ||
6688             !nla[NFTA_OBJ_DATA])
6689                 return -EINVAL;
6690
6691         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6692                                  NETLINK_CB(skb).portid);
6693         if (IS_ERR(table)) {
6694                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6695                 return PTR_ERR(table);
6696         }
6697
6698         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6699         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6700         if (IS_ERR(obj)) {
6701                 err = PTR_ERR(obj);
6702                 if (err != -ENOENT) {
6703                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6704                         return err;
6705                 }
6706         } else {
6707                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6708                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6709                         return -EEXIST;
6710                 }
6711                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6712                         return -EOPNOTSUPP;
6713
6714                 type = __nft_obj_type_get(objtype);
6715                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6716
6717                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6718         }
6719
6720         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6721
6722         type = nft_obj_type_get(net, objtype);
6723         if (IS_ERR(type))
6724                 return PTR_ERR(type);
6725
6726         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6727         if (IS_ERR(obj)) {
6728                 err = PTR_ERR(obj);
6729                 goto err_init;
6730         }
6731         obj->key.table = table;
6732         obj->handle = nf_tables_alloc_handle(table);
6733
6734         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6735         if (!obj->key.name) {
6736                 err = -ENOMEM;
6737                 goto err_strdup;
6738         }
6739
6740         if (nla[NFTA_OBJ_USERDATA]) {
6741                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6742                 if (obj->udata == NULL)
6743                         goto err_userdata;
6744
6745                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6746         }
6747
6748         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6749         if (err < 0)
6750                 goto err_trans;
6751
6752         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6753                               nft_objname_ht_params);
6754         if (err < 0)
6755                 goto err_obj_ht;
6756
6757         list_add_tail_rcu(&obj->list, &table->objects);
6758         table->use++;
6759         return 0;
6760 err_obj_ht:
6761         /* queued in transaction log */
6762         INIT_LIST_HEAD(&obj->list);
6763         return err;
6764 err_trans:
6765         kfree(obj->udata);
6766 err_userdata:
6767         kfree(obj->key.name);
6768 err_strdup:
6769         if (obj->ops->destroy)
6770                 obj->ops->destroy(&ctx, obj);
6771         kfree(obj);
6772 err_init:
6773         module_put(type->owner);
6774         return err;
6775 }
6776
6777 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6778                                    u32 portid, u32 seq, int event, u32 flags,
6779                                    int family, const struct nft_table *table,
6780                                    struct nft_object *obj, bool reset)
6781 {
6782         struct nlmsghdr *nlh;
6783
6784         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6785         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6786                            NFNETLINK_V0, nft_base_seq(net));
6787         if (!nlh)
6788                 goto nla_put_failure;
6789
6790         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6791             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6792             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6793             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6794             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6795             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6796                          NFTA_OBJ_PAD))
6797                 goto nla_put_failure;
6798
6799         if (obj->udata &&
6800             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6801                 goto nla_put_failure;
6802
6803         nlmsg_end(skb, nlh);
6804         return 0;
6805
6806 nla_put_failure:
6807         nlmsg_trim(skb, nlh);
6808         return -1;
6809 }
6810
6811 struct nft_obj_filter {
6812         char            *table;
6813         u32             type;
6814 };
6815
6816 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6817 {
6818         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6819         const struct nft_table *table;
6820         unsigned int idx = 0, s_idx = cb->args[0];
6821         struct nft_obj_filter *filter = cb->data;
6822         struct net *net = sock_net(skb->sk);
6823         int family = nfmsg->nfgen_family;
6824         struct nftables_pernet *nft_net;
6825         struct nft_object *obj;
6826         bool reset = false;
6827
6828         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6829                 reset = true;
6830
6831         rcu_read_lock();
6832         nft_net = nft_pernet(net);
6833         cb->seq = READ_ONCE(nft_net->base_seq);
6834
6835         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6836                 if (family != NFPROTO_UNSPEC && family != table->family)
6837                         continue;
6838
6839                 list_for_each_entry_rcu(obj, &table->objects, list) {
6840                         if (!nft_is_active(net, obj))
6841                                 goto cont;
6842                         if (idx < s_idx)
6843                                 goto cont;
6844                         if (idx > s_idx)
6845                                 memset(&cb->args[1], 0,
6846                                        sizeof(cb->args) - sizeof(cb->args[0]));
6847                         if (filter && filter->table &&
6848                             strcmp(filter->table, table->name))
6849                                 goto cont;
6850                         if (filter &&
6851                             filter->type != NFT_OBJECT_UNSPEC &&
6852                             obj->ops->type->type != filter->type)
6853                                 goto cont;
6854                         if (reset) {
6855                                 char *buf = kasprintf(GFP_ATOMIC,
6856                                                       "%s:%u",
6857                                                       table->name,
6858                                                       nft_net->base_seq);
6859
6860                                 audit_log_nfcfg(buf,
6861                                                 family,
6862                                                 obj->handle,
6863                                                 AUDIT_NFT_OP_OBJ_RESET,
6864                                                 GFP_ATOMIC);
6865                                 kfree(buf);
6866                         }
6867
6868                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6869                                                     cb->nlh->nlmsg_seq,
6870                                                     NFT_MSG_NEWOBJ,
6871                                                     NLM_F_MULTI | NLM_F_APPEND,
6872                                                     table->family, table,
6873                                                     obj, reset) < 0)
6874                                 goto done;
6875
6876                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6877 cont:
6878                         idx++;
6879                 }
6880         }
6881 done:
6882         rcu_read_unlock();
6883
6884         cb->args[0] = idx;
6885         return skb->len;
6886 }
6887
6888 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6889 {
6890         const struct nlattr * const *nla = cb->data;
6891         struct nft_obj_filter *filter = NULL;
6892
6893         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6894                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6895                 if (!filter)
6896                         return -ENOMEM;
6897
6898                 if (nla[NFTA_OBJ_TABLE]) {
6899                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6900                         if (!filter->table) {
6901                                 kfree(filter);
6902                                 return -ENOMEM;
6903                         }
6904                 }
6905
6906                 if (nla[NFTA_OBJ_TYPE])
6907                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6908         }
6909
6910         cb->data = filter;
6911         return 0;
6912 }
6913
6914 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6915 {
6916         struct nft_obj_filter *filter = cb->data;
6917
6918         if (filter) {
6919                 kfree(filter->table);
6920                 kfree(filter);
6921         }
6922
6923         return 0;
6924 }
6925
6926 /* called with rcu_read_lock held */
6927 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6928                             const struct nlattr * const nla[])
6929 {
6930         struct netlink_ext_ack *extack = info->extack;
6931         u8 genmask = nft_genmask_cur(info->net);
6932         u8 family = info->nfmsg->nfgen_family;
6933         const struct nft_table *table;
6934         struct net *net = info->net;
6935         struct nft_object *obj;
6936         struct sk_buff *skb2;
6937         bool reset = false;
6938         u32 objtype;
6939         int err;
6940
6941         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6942                 struct netlink_dump_control c = {
6943                         .start = nf_tables_dump_obj_start,
6944                         .dump = nf_tables_dump_obj,
6945                         .done = nf_tables_dump_obj_done,
6946                         .module = THIS_MODULE,
6947                         .data = (void *)nla,
6948                 };
6949
6950                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6951         }
6952
6953         if (!nla[NFTA_OBJ_NAME] ||
6954             !nla[NFTA_OBJ_TYPE])
6955                 return -EINVAL;
6956
6957         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6958         if (IS_ERR(table)) {
6959                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6960                 return PTR_ERR(table);
6961         }
6962
6963         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6964         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6965         if (IS_ERR(obj)) {
6966                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6967                 return PTR_ERR(obj);
6968         }
6969
6970         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6971         if (!skb2)
6972                 return -ENOMEM;
6973
6974         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6975                 reset = true;
6976
6977         if (reset) {
6978                 const struct nftables_pernet *nft_net;
6979                 char *buf;
6980
6981                 nft_net = nft_pernet(net);
6982                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
6983
6984                 audit_log_nfcfg(buf,
6985                                 family,
6986                                 obj->handle,
6987                                 AUDIT_NFT_OP_OBJ_RESET,
6988                                 GFP_ATOMIC);
6989                 kfree(buf);
6990         }
6991
6992         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6993                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6994                                       family, table, obj, reset);
6995         if (err < 0)
6996                 goto err_fill_obj_info;
6997
6998         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6999
7000 err_fill_obj_info:
7001         kfree_skb(skb2);
7002         return err;
7003 }
7004
7005 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7006 {
7007         if (obj->ops->destroy)
7008                 obj->ops->destroy(ctx, obj);
7009
7010         module_put(obj->ops->type->owner);
7011         kfree(obj->key.name);
7012         kfree(obj->udata);
7013         kfree(obj);
7014 }
7015
7016 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7017                             const struct nlattr * const nla[])
7018 {
7019         struct netlink_ext_ack *extack = info->extack;
7020         u8 genmask = nft_genmask_next(info->net);
7021         u8 family = info->nfmsg->nfgen_family;
7022         struct net *net = info->net;
7023         const struct nlattr *attr;
7024         struct nft_table *table;
7025         struct nft_object *obj;
7026         struct nft_ctx ctx;
7027         u32 objtype;
7028
7029         if (!nla[NFTA_OBJ_TYPE] ||
7030             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7031                 return -EINVAL;
7032
7033         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7034                                  NETLINK_CB(skb).portid);
7035         if (IS_ERR(table)) {
7036                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7037                 return PTR_ERR(table);
7038         }
7039
7040         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7041         if (nla[NFTA_OBJ_HANDLE]) {
7042                 attr = nla[NFTA_OBJ_HANDLE];
7043                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7044         } else {
7045                 attr = nla[NFTA_OBJ_NAME];
7046                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7047         }
7048
7049         if (IS_ERR(obj)) {
7050                 NL_SET_BAD_ATTR(extack, attr);
7051                 return PTR_ERR(obj);
7052         }
7053         if (obj->use > 0) {
7054                 NL_SET_BAD_ATTR(extack, attr);
7055                 return -EBUSY;
7056         }
7057
7058         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7059
7060         return nft_delobj(&ctx, obj);
7061 }
7062
7063 void nft_obj_notify(struct net *net, const struct nft_table *table,
7064                     struct nft_object *obj, u32 portid, u32 seq, int event,
7065                     u16 flags, int family, int report, gfp_t gfp)
7066 {
7067         struct nftables_pernet *nft_net = nft_pernet(net);
7068         struct sk_buff *skb;
7069         int err;
7070         char *buf = kasprintf(gfp, "%s:%u",
7071                               table->name, nft_net->base_seq);
7072
7073         audit_log_nfcfg(buf,
7074                         family,
7075                         obj->handle,
7076                         event == NFT_MSG_NEWOBJ ?
7077                                  AUDIT_NFT_OP_OBJ_REGISTER :
7078                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7079                         gfp);
7080         kfree(buf);
7081
7082         if (!report &&
7083             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7084                 return;
7085
7086         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7087         if (skb == NULL)
7088                 goto err;
7089
7090         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7091                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7092                                       family, table, obj, false);
7093         if (err < 0) {
7094                 kfree_skb(skb);
7095                 goto err;
7096         }
7097
7098         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7099         return;
7100 err:
7101         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7102 }
7103 EXPORT_SYMBOL_GPL(nft_obj_notify);
7104
7105 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7106                                  struct nft_object *obj, int event)
7107 {
7108         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7109                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7110 }
7111
7112 /*
7113  * Flow tables
7114  */
7115 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7116 {
7117         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7118         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7119         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7120 }
7121 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7122
7123 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7124 {
7125         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7126         list_del_rcu(&type->list);
7127         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7128 }
7129 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7130
7131 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7132         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7133                                             .len = NFT_NAME_MAXLEN - 1 },
7134         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7135                                             .len = NFT_NAME_MAXLEN - 1 },
7136         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7137         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7138         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7139 };
7140
7141 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7142                                            const struct nlattr *nla, u8 genmask)
7143 {
7144         struct nft_flowtable *flowtable;
7145
7146         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7147                 if (!nla_strcmp(nla, flowtable->name) &&
7148                     nft_active_genmask(flowtable, genmask))
7149                         return flowtable;
7150         }
7151         return ERR_PTR(-ENOENT);
7152 }
7153 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7154
7155 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7156                                     struct nft_flowtable *flowtable,
7157                                     enum nft_trans_phase phase)
7158 {
7159         switch (phase) {
7160         case NFT_TRANS_PREPARE:
7161         case NFT_TRANS_ABORT:
7162         case NFT_TRANS_RELEASE:
7163                 flowtable->use--;
7164                 fallthrough;
7165         default:
7166                 return;
7167         }
7168 }
7169 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7170
7171 static struct nft_flowtable *
7172 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7173                               const struct nlattr *nla, u8 genmask)
7174 {
7175        struct nft_flowtable *flowtable;
7176
7177        list_for_each_entry(flowtable, &table->flowtables, list) {
7178                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7179                    nft_active_genmask(flowtable, genmask))
7180                        return flowtable;
7181        }
7182        return ERR_PTR(-ENOENT);
7183 }
7184
7185 struct nft_flowtable_hook {
7186         u32                     num;
7187         int                     priority;
7188         struct list_head        list;
7189 };
7190
7191 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7192         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7193         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7194         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7195 };
7196
7197 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7198                                     const struct nlattr *attr,
7199                                     struct nft_flowtable_hook *flowtable_hook,
7200                                     struct nft_flowtable *flowtable, bool add)
7201 {
7202         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7203         struct nft_hook *hook;
7204         int hooknum, priority;
7205         int err;
7206
7207         INIT_LIST_HEAD(&flowtable_hook->list);
7208
7209         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7210                                           nft_flowtable_hook_policy, NULL);
7211         if (err < 0)
7212                 return err;
7213
7214         if (add) {
7215                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7216                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7217                         return -EINVAL;
7218
7219                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7220                 if (hooknum != NF_NETDEV_INGRESS)
7221                         return -EOPNOTSUPP;
7222
7223                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7224
7225                 flowtable_hook->priority        = priority;
7226                 flowtable_hook->num             = hooknum;
7227         } else {
7228                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7229                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7230                         if (hooknum != flowtable->hooknum)
7231                                 return -EOPNOTSUPP;
7232                 }
7233
7234                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7235                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7236                         if (priority != flowtable->data.priority)
7237                                 return -EOPNOTSUPP;
7238                 }
7239
7240                 flowtable_hook->priority        = flowtable->data.priority;
7241                 flowtable_hook->num             = flowtable->hooknum;
7242         }
7243
7244         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7245                 err = nf_tables_parse_netdev_hooks(ctx->net,
7246                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7247                                                    &flowtable_hook->list);
7248                 if (err < 0)
7249                         return err;
7250         }
7251
7252         list_for_each_entry(hook, &flowtable_hook->list, list) {
7253                 hook->ops.pf            = NFPROTO_NETDEV;
7254                 hook->ops.hooknum       = flowtable_hook->num;
7255                 hook->ops.priority      = flowtable_hook->priority;
7256                 hook->ops.priv          = &flowtable->data;
7257                 hook->ops.hook          = flowtable->data.type->hook;
7258         }
7259
7260         return err;
7261 }
7262
7263 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7264 {
7265         const struct nf_flowtable_type *type;
7266
7267         list_for_each_entry(type, &nf_tables_flowtables, list) {
7268                 if (family == type->family)
7269                         return type;
7270         }
7271         return NULL;
7272 }
7273
7274 static const struct nf_flowtable_type *
7275 nft_flowtable_type_get(struct net *net, u8 family)
7276 {
7277         const struct nf_flowtable_type *type;
7278
7279         type = __nft_flowtable_type_get(family);
7280         if (type != NULL && try_module_get(type->owner))
7281                 return type;
7282
7283         lockdep_nfnl_nft_mutex_not_held();
7284 #ifdef CONFIG_MODULES
7285         if (type == NULL) {
7286                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7287                         return ERR_PTR(-EAGAIN);
7288         }
7289 #endif
7290         return ERR_PTR(-ENOENT);
7291 }
7292
7293 /* Only called from error and netdev event paths. */
7294 static void nft_unregister_flowtable_hook(struct net *net,
7295                                           struct nft_flowtable *flowtable,
7296                                           struct nft_hook *hook)
7297 {
7298         nf_unregister_net_hook(net, &hook->ops);
7299         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7300                                     FLOW_BLOCK_UNBIND);
7301 }
7302
7303 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7304                                                  struct list_head *hook_list,
7305                                                  bool release_netdev)
7306 {
7307         struct nft_hook *hook, *next;
7308
7309         list_for_each_entry_safe(hook, next, hook_list, list) {
7310                 nf_unregister_net_hook(net, &hook->ops);
7311                 if (release_netdev) {
7312                         list_del(&hook->list);
7313                         kfree_rcu(hook, rcu);
7314                 }
7315         }
7316 }
7317
7318 static void nft_unregister_flowtable_net_hooks(struct net *net,
7319                                                struct list_head *hook_list)
7320 {
7321         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7322 }
7323
7324 static int nft_register_flowtable_net_hooks(struct net *net,
7325                                             struct nft_table *table,
7326                                             struct list_head *hook_list,
7327                                             struct nft_flowtable *flowtable)
7328 {
7329         struct nft_hook *hook, *hook2, *next;
7330         struct nft_flowtable *ft;
7331         int err, i = 0;
7332
7333         list_for_each_entry(hook, hook_list, list) {
7334                 list_for_each_entry(ft, &table->flowtables, list) {
7335                         if (!nft_is_active_next(net, ft))
7336                                 continue;
7337
7338                         list_for_each_entry(hook2, &ft->hook_list, list) {
7339                                 if (hook->ops.dev == hook2->ops.dev &&
7340                                     hook->ops.pf == hook2->ops.pf) {
7341                                         err = -EEXIST;
7342                                         goto err_unregister_net_hooks;
7343                                 }
7344                         }
7345                 }
7346
7347                 err = flowtable->data.type->setup(&flowtable->data,
7348                                                   hook->ops.dev,
7349                                                   FLOW_BLOCK_BIND);
7350                 if (err < 0)
7351                         goto err_unregister_net_hooks;
7352
7353                 err = nf_register_net_hook(net, &hook->ops);
7354                 if (err < 0) {
7355                         flowtable->data.type->setup(&flowtable->data,
7356                                                     hook->ops.dev,
7357                                                     FLOW_BLOCK_UNBIND);
7358                         goto err_unregister_net_hooks;
7359                 }
7360
7361                 i++;
7362         }
7363
7364         return 0;
7365
7366 err_unregister_net_hooks:
7367         list_for_each_entry_safe(hook, next, hook_list, list) {
7368                 if (i-- <= 0)
7369                         break;
7370
7371                 nft_unregister_flowtable_hook(net, flowtable, hook);
7372                 list_del_rcu(&hook->list);
7373                 kfree_rcu(hook, rcu);
7374         }
7375
7376         return err;
7377 }
7378
7379 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7380 {
7381         struct nft_hook *hook, *next;
7382
7383         list_for_each_entry_safe(hook, next, hook_list, list) {
7384                 list_del_rcu(&hook->list);
7385                 kfree_rcu(hook, rcu);
7386         }
7387 }
7388
7389 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7390                                 struct nft_flowtable *flowtable)
7391 {
7392         const struct nlattr * const *nla = ctx->nla;
7393         struct nft_flowtable_hook flowtable_hook;
7394         struct nft_hook *hook, *next;
7395         struct nft_trans *trans;
7396         bool unregister = false;
7397         u32 flags;
7398         int err;
7399
7400         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7401                                        &flowtable_hook, flowtable, false);
7402         if (err < 0)
7403                 return err;
7404
7405         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7406                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7407                         list_del(&hook->list);
7408                         kfree(hook);
7409                 }
7410         }
7411
7412         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7413                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7414                 if (flags & ~NFT_FLOWTABLE_MASK) {
7415                         err = -EOPNOTSUPP;
7416                         goto err_flowtable_update_hook;
7417                 }
7418                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7419                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7420                         err = -EOPNOTSUPP;
7421                         goto err_flowtable_update_hook;
7422                 }
7423         } else {
7424                 flags = flowtable->data.flags;
7425         }
7426
7427         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7428                                                &flowtable_hook.list, flowtable);
7429         if (err < 0)
7430                 goto err_flowtable_update_hook;
7431
7432         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7433                                 sizeof(struct nft_trans_flowtable));
7434         if (!trans) {
7435                 unregister = true;
7436                 err = -ENOMEM;
7437                 goto err_flowtable_update_hook;
7438         }
7439
7440         nft_trans_flowtable_flags(trans) = flags;
7441         nft_trans_flowtable(trans) = flowtable;
7442         nft_trans_flowtable_update(trans) = true;
7443         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7444         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7445
7446         nft_trans_commit_list_add_tail(ctx->net, trans);
7447
7448         return 0;
7449
7450 err_flowtable_update_hook:
7451         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7452                 if (unregister)
7453                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7454                 list_del_rcu(&hook->list);
7455                 kfree_rcu(hook, rcu);
7456         }
7457
7458         return err;
7459
7460 }
7461
7462 static int nf_tables_newflowtable(struct sk_buff *skb,
7463                                   const struct nfnl_info *info,
7464                                   const struct nlattr * const nla[])
7465 {
7466         struct netlink_ext_ack *extack = info->extack;
7467         struct nft_flowtable_hook flowtable_hook;
7468         u8 genmask = nft_genmask_next(info->net);
7469         u8 family = info->nfmsg->nfgen_family;
7470         const struct nf_flowtable_type *type;
7471         struct nft_flowtable *flowtable;
7472         struct nft_hook *hook, *next;
7473         struct net *net = info->net;
7474         struct nft_table *table;
7475         struct nft_ctx ctx;
7476         int err;
7477
7478         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7479             !nla[NFTA_FLOWTABLE_NAME] ||
7480             !nla[NFTA_FLOWTABLE_HOOK])
7481                 return -EINVAL;
7482
7483         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7484                                  genmask, NETLINK_CB(skb).portid);
7485         if (IS_ERR(table)) {
7486                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7487                 return PTR_ERR(table);
7488         }
7489
7490         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7491                                          genmask);
7492         if (IS_ERR(flowtable)) {
7493                 err = PTR_ERR(flowtable);
7494                 if (err != -ENOENT) {
7495                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7496                         return err;
7497                 }
7498         } else {
7499                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7500                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7501                         return -EEXIST;
7502                 }
7503
7504                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7505
7506                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7507         }
7508
7509         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7510
7511         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7512         if (!flowtable)
7513                 return -ENOMEM;
7514
7515         flowtable->table = table;
7516         flowtable->handle = nf_tables_alloc_handle(table);
7517         INIT_LIST_HEAD(&flowtable->hook_list);
7518
7519         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7520         if (!flowtable->name) {
7521                 err = -ENOMEM;
7522                 goto err1;
7523         }
7524
7525         type = nft_flowtable_type_get(net, family);
7526         if (IS_ERR(type)) {
7527                 err = PTR_ERR(type);
7528                 goto err2;
7529         }
7530
7531         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7532                 flowtable->data.flags =
7533                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7534                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7535                         err = -EOPNOTSUPP;
7536                         goto err3;
7537                 }
7538         }
7539
7540         write_pnet(&flowtable->data.net, net);
7541         flowtable->data.type = type;
7542         err = type->init(&flowtable->data);
7543         if (err < 0)
7544                 goto err3;
7545
7546         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7547                                        &flowtable_hook, flowtable, true);
7548         if (err < 0)
7549                 goto err4;
7550
7551         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7552         flowtable->data.priority = flowtable_hook.priority;
7553         flowtable->hooknum = flowtable_hook.num;
7554
7555         err = nft_register_flowtable_net_hooks(ctx.net, table,
7556                                                &flowtable->hook_list,
7557                                                flowtable);
7558         if (err < 0) {
7559                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7560                 goto err4;
7561         }
7562
7563         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7564         if (err < 0)
7565                 goto err5;
7566
7567         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7568         table->use++;
7569
7570         return 0;
7571 err5:
7572         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7573                 nft_unregister_flowtable_hook(net, flowtable, hook);
7574                 list_del_rcu(&hook->list);
7575                 kfree_rcu(hook, rcu);
7576         }
7577 err4:
7578         flowtable->data.type->free(&flowtable->data);
7579 err3:
7580         module_put(type->owner);
7581 err2:
7582         kfree(flowtable->name);
7583 err1:
7584         kfree(flowtable);
7585         return err;
7586 }
7587
7588 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7589 {
7590         struct nft_hook *this, *next;
7591
7592         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7593                 list_del(&this->list);
7594                 kfree(this);
7595         }
7596 }
7597
7598 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7599                                  struct nft_flowtable *flowtable)
7600 {
7601         const struct nlattr * const *nla = ctx->nla;
7602         struct nft_flowtable_hook flowtable_hook;
7603         LIST_HEAD(flowtable_del_list);
7604         struct nft_hook *this, *hook;
7605         struct nft_trans *trans;
7606         int err;
7607
7608         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7609                                        &flowtable_hook, flowtable, false);
7610         if (err < 0)
7611                 return err;
7612
7613         list_for_each_entry(this, &flowtable_hook.list, list) {
7614                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7615                 if (!hook) {
7616                         err = -ENOENT;
7617                         goto err_flowtable_del_hook;
7618                 }
7619                 list_move(&hook->list, &flowtable_del_list);
7620         }
7621
7622         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7623                                 sizeof(struct nft_trans_flowtable));
7624         if (!trans) {
7625                 err = -ENOMEM;
7626                 goto err_flowtable_del_hook;
7627         }
7628
7629         nft_trans_flowtable(trans) = flowtable;
7630         nft_trans_flowtable_update(trans) = true;
7631         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7632         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7633         nft_flowtable_hook_release(&flowtable_hook);
7634
7635         nft_trans_commit_list_add_tail(ctx->net, trans);
7636
7637         return 0;
7638
7639 err_flowtable_del_hook:
7640         list_splice(&flowtable_del_list, &flowtable->hook_list);
7641         nft_flowtable_hook_release(&flowtable_hook);
7642
7643         return err;
7644 }
7645
7646 static int nf_tables_delflowtable(struct sk_buff *skb,
7647                                   const struct nfnl_info *info,
7648                                   const struct nlattr * const nla[])
7649 {
7650         struct netlink_ext_ack *extack = info->extack;
7651         u8 genmask = nft_genmask_next(info->net);
7652         u8 family = info->nfmsg->nfgen_family;
7653         struct nft_flowtable *flowtable;
7654         struct net *net = info->net;
7655         const struct nlattr *attr;
7656         struct nft_table *table;
7657         struct nft_ctx ctx;
7658
7659         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7660             (!nla[NFTA_FLOWTABLE_NAME] &&
7661              !nla[NFTA_FLOWTABLE_HANDLE]))
7662                 return -EINVAL;
7663
7664         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7665                                  genmask, NETLINK_CB(skb).portid);
7666         if (IS_ERR(table)) {
7667                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7668                 return PTR_ERR(table);
7669         }
7670
7671         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7672                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7673                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7674         } else {
7675                 attr = nla[NFTA_FLOWTABLE_NAME];
7676                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7677         }
7678
7679         if (IS_ERR(flowtable)) {
7680                 NL_SET_BAD_ATTR(extack, attr);
7681                 return PTR_ERR(flowtable);
7682         }
7683
7684         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7685
7686         if (nla[NFTA_FLOWTABLE_HOOK])
7687                 return nft_delflowtable_hook(&ctx, flowtable);
7688
7689         if (flowtable->use > 0) {
7690                 NL_SET_BAD_ATTR(extack, attr);
7691                 return -EBUSY;
7692         }
7693
7694         return nft_delflowtable(&ctx, flowtable);
7695 }
7696
7697 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7698                                          u32 portid, u32 seq, int event,
7699                                          u32 flags, int family,
7700                                          struct nft_flowtable *flowtable,
7701                                          struct list_head *hook_list)
7702 {
7703         struct nlattr *nest, *nest_devs;
7704         struct nft_hook *hook;
7705         struct nlmsghdr *nlh;
7706
7707         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7708         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7709                            NFNETLINK_V0, nft_base_seq(net));
7710         if (!nlh)
7711                 goto nla_put_failure;
7712
7713         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7714             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7715             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7716             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7717                          NFTA_FLOWTABLE_PAD) ||
7718             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7719                 goto nla_put_failure;
7720
7721         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7722         if (!nest)
7723                 goto nla_put_failure;
7724         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7725             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7726                 goto nla_put_failure;
7727
7728         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7729         if (!nest_devs)
7730                 goto nla_put_failure;
7731
7732         list_for_each_entry_rcu(hook, hook_list, list) {
7733                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7734                         goto nla_put_failure;
7735         }
7736         nla_nest_end(skb, nest_devs);
7737         nla_nest_end(skb, nest);
7738
7739         nlmsg_end(skb, nlh);
7740         return 0;
7741
7742 nla_put_failure:
7743         nlmsg_trim(skb, nlh);
7744         return -1;
7745 }
7746
7747 struct nft_flowtable_filter {
7748         char            *table;
7749 };
7750
7751 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7752                                     struct netlink_callback *cb)
7753 {
7754         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7755         struct nft_flowtable_filter *filter = cb->data;
7756         unsigned int idx = 0, s_idx = cb->args[0];
7757         struct net *net = sock_net(skb->sk);
7758         int family = nfmsg->nfgen_family;
7759         struct nft_flowtable *flowtable;
7760         struct nftables_pernet *nft_net;
7761         const struct nft_table *table;
7762
7763         rcu_read_lock();
7764         nft_net = nft_pernet(net);
7765         cb->seq = READ_ONCE(nft_net->base_seq);
7766
7767         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7768                 if (family != NFPROTO_UNSPEC && family != table->family)
7769                         continue;
7770
7771                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7772                         if (!nft_is_active(net, flowtable))
7773                                 goto cont;
7774                         if (idx < s_idx)
7775                                 goto cont;
7776                         if (idx > s_idx)
7777                                 memset(&cb->args[1], 0,
7778                                        sizeof(cb->args) - sizeof(cb->args[0]));
7779                         if (filter && filter->table &&
7780                             strcmp(filter->table, table->name))
7781                                 goto cont;
7782
7783                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7784                                                           cb->nlh->nlmsg_seq,
7785                                                           NFT_MSG_NEWFLOWTABLE,
7786                                                           NLM_F_MULTI | NLM_F_APPEND,
7787                                                           table->family,
7788                                                           flowtable,
7789                                                           &flowtable->hook_list) < 0)
7790                                 goto done;
7791
7792                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7793 cont:
7794                         idx++;
7795                 }
7796         }
7797 done:
7798         rcu_read_unlock();
7799
7800         cb->args[0] = idx;
7801         return skb->len;
7802 }
7803
7804 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7805 {
7806         const struct nlattr * const *nla = cb->data;
7807         struct nft_flowtable_filter *filter = NULL;
7808
7809         if (nla[NFTA_FLOWTABLE_TABLE]) {
7810                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7811                 if (!filter)
7812                         return -ENOMEM;
7813
7814                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7815                                            GFP_ATOMIC);
7816                 if (!filter->table) {
7817                         kfree(filter);
7818                         return -ENOMEM;
7819                 }
7820         }
7821
7822         cb->data = filter;
7823         return 0;
7824 }
7825
7826 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7827 {
7828         struct nft_flowtable_filter *filter = cb->data;
7829
7830         if (!filter)
7831                 return 0;
7832
7833         kfree(filter->table);
7834         kfree(filter);
7835
7836         return 0;
7837 }
7838
7839 /* called with rcu_read_lock held */
7840 static int nf_tables_getflowtable(struct sk_buff *skb,
7841                                   const struct nfnl_info *info,
7842                                   const struct nlattr * const nla[])
7843 {
7844         u8 genmask = nft_genmask_cur(info->net);
7845         u8 family = info->nfmsg->nfgen_family;
7846         struct nft_flowtable *flowtable;
7847         const struct nft_table *table;
7848         struct net *net = info->net;
7849         struct sk_buff *skb2;
7850         int err;
7851
7852         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7853                 struct netlink_dump_control c = {
7854                         .start = nf_tables_dump_flowtable_start,
7855                         .dump = nf_tables_dump_flowtable,
7856                         .done = nf_tables_dump_flowtable_done,
7857                         .module = THIS_MODULE,
7858                         .data = (void *)nla,
7859                 };
7860
7861                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7862         }
7863
7864         if (!nla[NFTA_FLOWTABLE_NAME])
7865                 return -EINVAL;
7866
7867         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7868                                  genmask, 0);
7869         if (IS_ERR(table))
7870                 return PTR_ERR(table);
7871
7872         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7873                                          genmask);
7874         if (IS_ERR(flowtable))
7875                 return PTR_ERR(flowtable);
7876
7877         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7878         if (!skb2)
7879                 return -ENOMEM;
7880
7881         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7882                                             info->nlh->nlmsg_seq,
7883                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7884                                             flowtable, &flowtable->hook_list);
7885         if (err < 0)
7886                 goto err_fill_flowtable_info;
7887
7888         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7889
7890 err_fill_flowtable_info:
7891         kfree_skb(skb2);
7892         return err;
7893 }
7894
7895 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7896                                        struct nft_flowtable *flowtable,
7897                                        struct list_head *hook_list,
7898                                        int event)
7899 {
7900         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7901         struct sk_buff *skb;
7902         u16 flags = 0;
7903         int err;
7904
7905         if (!ctx->report &&
7906             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7907                 return;
7908
7909         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7910         if (skb == NULL)
7911                 goto err;
7912
7913         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7914                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7915
7916         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7917                                             ctx->seq, event, flags,
7918                                             ctx->family, flowtable, hook_list);
7919         if (err < 0) {
7920                 kfree_skb(skb);
7921                 goto err;
7922         }
7923
7924         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7925         return;
7926 err:
7927         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7928 }
7929
7930 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7931 {
7932         struct nft_hook *hook, *next;
7933
7934         flowtable->data.type->free(&flowtable->data);
7935         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7936                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7937                                             FLOW_BLOCK_UNBIND);
7938                 list_del_rcu(&hook->list);
7939                 kfree(hook);
7940         }
7941         kfree(flowtable->name);
7942         module_put(flowtable->data.type->owner);
7943         kfree(flowtable);
7944 }
7945
7946 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7947                                    u32 portid, u32 seq)
7948 {
7949         struct nftables_pernet *nft_net = nft_pernet(net);
7950         struct nlmsghdr *nlh;
7951         char buf[TASK_COMM_LEN];
7952         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7953
7954         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7955                            NFNETLINK_V0, nft_base_seq(net));
7956         if (!nlh)
7957                 goto nla_put_failure;
7958
7959         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7960             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7961             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7962                 goto nla_put_failure;
7963
7964         nlmsg_end(skb, nlh);
7965         return 0;
7966
7967 nla_put_failure:
7968         nlmsg_trim(skb, nlh);
7969         return -EMSGSIZE;
7970 }
7971
7972 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7973                                 struct nft_flowtable *flowtable)
7974 {
7975         struct nft_hook *hook;
7976
7977         list_for_each_entry(hook, &flowtable->hook_list, list) {
7978                 if (hook->ops.dev != dev)
7979                         continue;
7980
7981                 /* flow_offload_netdev_event() cleans up entries for us. */
7982                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7983                 list_del_rcu(&hook->list);
7984                 kfree_rcu(hook, rcu);
7985                 break;
7986         }
7987 }
7988
7989 static int nf_tables_flowtable_event(struct notifier_block *this,
7990                                      unsigned long event, void *ptr)
7991 {
7992         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7993         struct nft_flowtable *flowtable;
7994         struct nftables_pernet *nft_net;
7995         struct nft_table *table;
7996         struct net *net;
7997
7998         if (event != NETDEV_UNREGISTER)
7999                 return 0;
8000
8001         net = dev_net(dev);
8002         nft_net = nft_pernet(net);
8003         mutex_lock(&nft_net->commit_mutex);
8004         list_for_each_entry(table, &nft_net->tables, list) {
8005                 list_for_each_entry(flowtable, &table->flowtables, list) {
8006                         nft_flowtable_event(event, dev, flowtable);
8007                 }
8008         }
8009         mutex_unlock(&nft_net->commit_mutex);
8010
8011         return NOTIFY_DONE;
8012 }
8013
8014 static struct notifier_block nf_tables_flowtable_notifier = {
8015         .notifier_call  = nf_tables_flowtable_event,
8016 };
8017
8018 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8019                                  int event)
8020 {
8021         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8022         struct sk_buff *skb2;
8023         int err;
8024
8025         if (!nlmsg_report(nlh) &&
8026             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8027                 return;
8028
8029         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8030         if (skb2 == NULL)
8031                 goto err;
8032
8033         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8034                                       nlh->nlmsg_seq);
8035         if (err < 0) {
8036                 kfree_skb(skb2);
8037                 goto err;
8038         }
8039
8040         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8041                        nlmsg_report(nlh), GFP_KERNEL);
8042         return;
8043 err:
8044         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8045                           -ENOBUFS);
8046 }
8047
8048 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8049                             const struct nlattr * const nla[])
8050 {
8051         struct sk_buff *skb2;
8052         int err;
8053
8054         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8055         if (skb2 == NULL)
8056                 return -ENOMEM;
8057
8058         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8059                                       info->nlh->nlmsg_seq);
8060         if (err < 0)
8061                 goto err_fill_gen_info;
8062
8063         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8064
8065 err_fill_gen_info:
8066         kfree_skb(skb2);
8067         return err;
8068 }
8069
8070 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8071         [NFT_MSG_NEWTABLE] = {
8072                 .call           = nf_tables_newtable,
8073                 .type           = NFNL_CB_BATCH,
8074                 .attr_count     = NFTA_TABLE_MAX,
8075                 .policy         = nft_table_policy,
8076         },
8077         [NFT_MSG_GETTABLE] = {
8078                 .call           = nf_tables_gettable,
8079                 .type           = NFNL_CB_RCU,
8080                 .attr_count     = NFTA_TABLE_MAX,
8081                 .policy         = nft_table_policy,
8082         },
8083         [NFT_MSG_DELTABLE] = {
8084                 .call           = nf_tables_deltable,
8085                 .type           = NFNL_CB_BATCH,
8086                 .attr_count     = NFTA_TABLE_MAX,
8087                 .policy         = nft_table_policy,
8088         },
8089         [NFT_MSG_NEWCHAIN] = {
8090                 .call           = nf_tables_newchain,
8091                 .type           = NFNL_CB_BATCH,
8092                 .attr_count     = NFTA_CHAIN_MAX,
8093                 .policy         = nft_chain_policy,
8094         },
8095         [NFT_MSG_GETCHAIN] = {
8096                 .call           = nf_tables_getchain,
8097                 .type           = NFNL_CB_RCU,
8098                 .attr_count     = NFTA_CHAIN_MAX,
8099                 .policy         = nft_chain_policy,
8100         },
8101         [NFT_MSG_DELCHAIN] = {
8102                 .call           = nf_tables_delchain,
8103                 .type           = NFNL_CB_BATCH,
8104                 .attr_count     = NFTA_CHAIN_MAX,
8105                 .policy         = nft_chain_policy,
8106         },
8107         [NFT_MSG_NEWRULE] = {
8108                 .call           = nf_tables_newrule,
8109                 .type           = NFNL_CB_BATCH,
8110                 .attr_count     = NFTA_RULE_MAX,
8111                 .policy         = nft_rule_policy,
8112         },
8113         [NFT_MSG_GETRULE] = {
8114                 .call           = nf_tables_getrule,
8115                 .type           = NFNL_CB_RCU,
8116                 .attr_count     = NFTA_RULE_MAX,
8117                 .policy         = nft_rule_policy,
8118         },
8119         [NFT_MSG_DELRULE] = {
8120                 .call           = nf_tables_delrule,
8121                 .type           = NFNL_CB_BATCH,
8122                 .attr_count     = NFTA_RULE_MAX,
8123                 .policy         = nft_rule_policy,
8124         },
8125         [NFT_MSG_NEWSET] = {
8126                 .call           = nf_tables_newset,
8127                 .type           = NFNL_CB_BATCH,
8128                 .attr_count     = NFTA_SET_MAX,
8129                 .policy         = nft_set_policy,
8130         },
8131         [NFT_MSG_GETSET] = {
8132                 .call           = nf_tables_getset,
8133                 .type           = NFNL_CB_RCU,
8134                 .attr_count     = NFTA_SET_MAX,
8135                 .policy         = nft_set_policy,
8136         },
8137         [NFT_MSG_DELSET] = {
8138                 .call           = nf_tables_delset,
8139                 .type           = NFNL_CB_BATCH,
8140                 .attr_count     = NFTA_SET_MAX,
8141                 .policy         = nft_set_policy,
8142         },
8143         [NFT_MSG_NEWSETELEM] = {
8144                 .call           = nf_tables_newsetelem,
8145                 .type           = NFNL_CB_BATCH,
8146                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8147                 .policy         = nft_set_elem_list_policy,
8148         },
8149         [NFT_MSG_GETSETELEM] = {
8150                 .call           = nf_tables_getsetelem,
8151                 .type           = NFNL_CB_RCU,
8152                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8153                 .policy         = nft_set_elem_list_policy,
8154         },
8155         [NFT_MSG_DELSETELEM] = {
8156                 .call           = nf_tables_delsetelem,
8157                 .type           = NFNL_CB_BATCH,
8158                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8159                 .policy         = nft_set_elem_list_policy,
8160         },
8161         [NFT_MSG_GETGEN] = {
8162                 .call           = nf_tables_getgen,
8163                 .type           = NFNL_CB_RCU,
8164         },
8165         [NFT_MSG_NEWOBJ] = {
8166                 .call           = nf_tables_newobj,
8167                 .type           = NFNL_CB_BATCH,
8168                 .attr_count     = NFTA_OBJ_MAX,
8169                 .policy         = nft_obj_policy,
8170         },
8171         [NFT_MSG_GETOBJ] = {
8172                 .call           = nf_tables_getobj,
8173                 .type           = NFNL_CB_RCU,
8174                 .attr_count     = NFTA_OBJ_MAX,
8175                 .policy         = nft_obj_policy,
8176         },
8177         [NFT_MSG_DELOBJ] = {
8178                 .call           = nf_tables_delobj,
8179                 .type           = NFNL_CB_BATCH,
8180                 .attr_count     = NFTA_OBJ_MAX,
8181                 .policy         = nft_obj_policy,
8182         },
8183         [NFT_MSG_GETOBJ_RESET] = {
8184                 .call           = nf_tables_getobj,
8185                 .type           = NFNL_CB_RCU,
8186                 .attr_count     = NFTA_OBJ_MAX,
8187                 .policy         = nft_obj_policy,
8188         },
8189         [NFT_MSG_NEWFLOWTABLE] = {
8190                 .call           = nf_tables_newflowtable,
8191                 .type           = NFNL_CB_BATCH,
8192                 .attr_count     = NFTA_FLOWTABLE_MAX,
8193                 .policy         = nft_flowtable_policy,
8194         },
8195         [NFT_MSG_GETFLOWTABLE] = {
8196                 .call           = nf_tables_getflowtable,
8197                 .type           = NFNL_CB_RCU,
8198                 .attr_count     = NFTA_FLOWTABLE_MAX,
8199                 .policy         = nft_flowtable_policy,
8200         },
8201         [NFT_MSG_DELFLOWTABLE] = {
8202                 .call           = nf_tables_delflowtable,
8203                 .type           = NFNL_CB_BATCH,
8204                 .attr_count     = NFTA_FLOWTABLE_MAX,
8205                 .policy         = nft_flowtable_policy,
8206         },
8207 };
8208
8209 static int nf_tables_validate(struct net *net)
8210 {
8211         struct nftables_pernet *nft_net = nft_pernet(net);
8212         struct nft_table *table;
8213
8214         switch (nft_net->validate_state) {
8215         case NFT_VALIDATE_SKIP:
8216                 break;
8217         case NFT_VALIDATE_NEED:
8218                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8219                 fallthrough;
8220         case NFT_VALIDATE_DO:
8221                 list_for_each_entry(table, &nft_net->tables, list) {
8222                         if (nft_table_validate(net, table) < 0)
8223                                 return -EAGAIN;
8224                 }
8225                 break;
8226         }
8227
8228         return 0;
8229 }
8230
8231 /* a drop policy has to be deferred until all rules have been activated,
8232  * otherwise a large ruleset that contains a drop-policy base chain will
8233  * cause all packets to get dropped until the full transaction has been
8234  * processed.
8235  *
8236  * We defer the drop policy until the transaction has been finalized.
8237  */
8238 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8239 {
8240         struct nft_base_chain *basechain;
8241
8242         if (nft_trans_chain_policy(trans) != NF_DROP)
8243                 return;
8244
8245         if (!nft_is_base_chain(trans->ctx.chain))
8246                 return;
8247
8248         basechain = nft_base_chain(trans->ctx.chain);
8249         basechain->policy = NF_DROP;
8250 }
8251
8252 static void nft_chain_commit_update(struct nft_trans *trans)
8253 {
8254         struct nft_base_chain *basechain;
8255
8256         if (nft_trans_chain_name(trans)) {
8257                 rhltable_remove(&trans->ctx.table->chains_ht,
8258                                 &trans->ctx.chain->rhlhead,
8259                                 nft_chain_ht_params);
8260                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8261                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8262                                     trans->ctx.chain->name,
8263                                     &trans->ctx.chain->rhlhead,
8264                                     nft_chain_ht_params);
8265         }
8266
8267         if (!nft_is_base_chain(trans->ctx.chain))
8268                 return;
8269
8270         nft_chain_stats_replace(trans);
8271
8272         basechain = nft_base_chain(trans->ctx.chain);
8273
8274         switch (nft_trans_chain_policy(trans)) {
8275         case NF_DROP:
8276         case NF_ACCEPT:
8277                 basechain->policy = nft_trans_chain_policy(trans);
8278                 break;
8279         }
8280 }
8281
8282 static void nft_obj_commit_update(struct nft_trans *trans)
8283 {
8284         struct nft_object *newobj;
8285         struct nft_object *obj;
8286
8287         obj = nft_trans_obj(trans);
8288         newobj = nft_trans_obj_newobj(trans);
8289
8290         if (obj->ops->update)
8291                 obj->ops->update(obj, newobj);
8292
8293         nft_obj_destroy(&trans->ctx, newobj);
8294 }
8295
8296 static void nft_commit_release(struct nft_trans *trans)
8297 {
8298         switch (trans->msg_type) {
8299         case NFT_MSG_DELTABLE:
8300                 nf_tables_table_destroy(&trans->ctx);
8301                 break;
8302         case NFT_MSG_NEWCHAIN:
8303                 free_percpu(nft_trans_chain_stats(trans));
8304                 kfree(nft_trans_chain_name(trans));
8305                 break;
8306         case NFT_MSG_DELCHAIN:
8307                 nf_tables_chain_destroy(&trans->ctx);
8308                 break;
8309         case NFT_MSG_DELRULE:
8310                 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8311                         nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8312
8313                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8314                 break;
8315         case NFT_MSG_DELSET:
8316                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8317                 break;
8318         case NFT_MSG_DELSETELEM:
8319                 nf_tables_set_elem_destroy(&trans->ctx,
8320                                            nft_trans_elem_set(trans),
8321                                            nft_trans_elem(trans).priv);
8322                 break;
8323         case NFT_MSG_DELOBJ:
8324                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8325                 break;
8326         case NFT_MSG_DELFLOWTABLE:
8327                 if (nft_trans_flowtable_update(trans))
8328                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8329                 else
8330                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8331                 break;
8332         }
8333
8334         if (trans->put_net)
8335                 put_net(trans->ctx.net);
8336
8337         kfree(trans);
8338 }
8339
8340 static void nf_tables_trans_destroy_work(struct work_struct *w)
8341 {
8342         struct nft_trans *trans, *next;
8343         LIST_HEAD(head);
8344
8345         spin_lock(&nf_tables_destroy_list_lock);
8346         list_splice_init(&nf_tables_destroy_list, &head);
8347         spin_unlock(&nf_tables_destroy_list_lock);
8348
8349         if (list_empty(&head))
8350                 return;
8351
8352         synchronize_rcu();
8353
8354         list_for_each_entry_safe(trans, next, &head, list) {
8355                 list_del(&trans->list);
8356                 nft_commit_release(trans);
8357         }
8358 }
8359
8360 void nf_tables_trans_destroy_flush_work(void)
8361 {
8362         flush_work(&trans_destroy_work);
8363 }
8364 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8365
8366 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8367 {
8368         struct nft_rule *rule;
8369         unsigned int alloc = 0;
8370         int i;
8371
8372         /* already handled or inactive chain? */
8373         if (chain->rules_next || !nft_is_active_next(net, chain))
8374                 return 0;
8375
8376         rule = list_entry(&chain->rules, struct nft_rule, list);
8377         i = 0;
8378
8379         list_for_each_entry_continue(rule, &chain->rules, list) {
8380                 if (nft_is_active_next(net, rule))
8381                         alloc++;
8382         }
8383
8384         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8385         if (!chain->rules_next)
8386                 return -ENOMEM;
8387
8388         list_for_each_entry_continue(rule, &chain->rules, list) {
8389                 if (nft_is_active_next(net, rule))
8390                         chain->rules_next[i++] = rule;
8391         }
8392
8393         chain->rules_next[i] = NULL;
8394         return 0;
8395 }
8396
8397 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8398 {
8399         struct nftables_pernet *nft_net = nft_pernet(net);
8400         struct nft_trans *trans, *next;
8401
8402         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8403                 struct nft_chain *chain = trans->ctx.chain;
8404
8405                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8406                     trans->msg_type == NFT_MSG_DELRULE) {
8407                         kvfree(chain->rules_next);
8408                         chain->rules_next = NULL;
8409                 }
8410         }
8411 }
8412
8413 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8414 {
8415         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8416
8417         kvfree(o->start);
8418 }
8419
8420 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8421 {
8422         struct nft_rule **r = rules;
8423         struct nft_rules_old *old;
8424
8425         while (*r)
8426                 r++;
8427
8428         r++;    /* rcu_head is after end marker */
8429         old = (void *) r;
8430         old->start = rules;
8431
8432         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8433 }
8434
8435 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8436 {
8437         struct nft_rule **g0, **g1;
8438         bool next_genbit;
8439
8440         next_genbit = nft_gencursor_next(net);
8441
8442         g0 = rcu_dereference_protected(chain->rules_gen_0,
8443                                        lockdep_commit_lock_is_held(net));
8444         g1 = rcu_dereference_protected(chain->rules_gen_1,
8445                                        lockdep_commit_lock_is_held(net));
8446
8447         /* No changes to this chain? */
8448         if (chain->rules_next == NULL) {
8449                 /* chain had no change in last or next generation */
8450                 if (g0 == g1)
8451                         return;
8452                 /*
8453                  * chain had no change in this generation; make sure next
8454                  * one uses same rules as current generation.
8455                  */
8456                 if (next_genbit) {
8457                         rcu_assign_pointer(chain->rules_gen_1, g0);
8458                         nf_tables_commit_chain_free_rules_old(g1);
8459                 } else {
8460                         rcu_assign_pointer(chain->rules_gen_0, g1);
8461                         nf_tables_commit_chain_free_rules_old(g0);
8462                 }
8463
8464                 return;
8465         }
8466
8467         if (next_genbit)
8468                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8469         else
8470                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8471
8472         chain->rules_next = NULL;
8473
8474         if (g0 == g1)
8475                 return;
8476
8477         if (next_genbit)
8478                 nf_tables_commit_chain_free_rules_old(g1);
8479         else
8480                 nf_tables_commit_chain_free_rules_old(g0);
8481 }
8482
8483 static void nft_obj_del(struct nft_object *obj)
8484 {
8485         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8486         list_del_rcu(&obj->list);
8487 }
8488
8489 void nft_chain_del(struct nft_chain *chain)
8490 {
8491         struct nft_table *table = chain->table;
8492
8493         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8494                                      nft_chain_ht_params));
8495         list_del_rcu(&chain->list);
8496 }
8497
8498 static void nf_tables_module_autoload_cleanup(struct net *net)
8499 {
8500         struct nftables_pernet *nft_net = nft_pernet(net);
8501         struct nft_module_request *req, *next;
8502
8503         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8504         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8505                 WARN_ON_ONCE(!req->done);
8506                 list_del(&req->list);
8507                 kfree(req);
8508         }
8509 }
8510
8511 static void nf_tables_commit_release(struct net *net)
8512 {
8513         struct nftables_pernet *nft_net = nft_pernet(net);
8514         struct nft_trans *trans;
8515
8516         /* all side effects have to be made visible.
8517          * For example, if a chain named 'foo' has been deleted, a
8518          * new transaction must not find it anymore.
8519          *
8520          * Memory reclaim happens asynchronously from work queue
8521          * to prevent expensive synchronize_rcu() in commit phase.
8522          */
8523         if (list_empty(&nft_net->commit_list)) {
8524                 nf_tables_module_autoload_cleanup(net);
8525                 mutex_unlock(&nft_net->commit_mutex);
8526                 return;
8527         }
8528
8529         trans = list_last_entry(&nft_net->commit_list,
8530                                 struct nft_trans, list);
8531         get_net(trans->ctx.net);
8532         WARN_ON_ONCE(trans->put_net);
8533
8534         trans->put_net = true;
8535         spin_lock(&nf_tables_destroy_list_lock);
8536         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8537         spin_unlock(&nf_tables_destroy_list_lock);
8538
8539         nf_tables_module_autoload_cleanup(net);
8540         schedule_work(&trans_destroy_work);
8541
8542         mutex_unlock(&nft_net->commit_mutex);
8543 }
8544
8545 static void nft_commit_notify(struct net *net, u32 portid)
8546 {
8547         struct nftables_pernet *nft_net = nft_pernet(net);
8548         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8549         unsigned char *data;
8550         int len;
8551
8552         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8553                 if (!batch_skb) {
8554 new_batch:
8555                         batch_skb = skb;
8556                         len = NLMSG_GOODSIZE - skb->len;
8557                         list_del(&skb->list);
8558                         continue;
8559                 }
8560                 len -= skb->len;
8561                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8562                         data = skb_put(batch_skb, skb->len);
8563                         memcpy(data, skb->data, skb->len);
8564                         list_del(&skb->list);
8565                         kfree_skb(skb);
8566                         continue;
8567                 }
8568                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8569                                NFT_CB(batch_skb).report, GFP_KERNEL);
8570                 goto new_batch;
8571         }
8572
8573         if (batch_skb) {
8574                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8575                                NFT_CB(batch_skb).report, GFP_KERNEL);
8576         }
8577
8578         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8579 }
8580
8581 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8582                                         struct nft_table *table)
8583 {
8584         struct nft_audit_data *adp;
8585
8586         list_for_each_entry(adp, adl, list) {
8587                 if (adp->table == table)
8588                         return 0;
8589         }
8590         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8591         if (!adp)
8592                 return -ENOMEM;
8593         adp->table = table;
8594         list_add(&adp->list, adl);
8595         return 0;
8596 }
8597
8598 static void nf_tables_commit_audit_free(struct list_head *adl)
8599 {
8600         struct nft_audit_data *adp, *adn;
8601
8602         list_for_each_entry_safe(adp, adn, adl, list) {
8603                 list_del(&adp->list);
8604                 kfree(adp);
8605         }
8606 }
8607
8608 static void nf_tables_commit_audit_collect(struct list_head *adl,
8609                                            struct nft_table *table, u32 op)
8610 {
8611         struct nft_audit_data *adp;
8612
8613         list_for_each_entry(adp, adl, list) {
8614                 if (adp->table == table)
8615                         goto found;
8616         }
8617         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8618         return;
8619 found:
8620         adp->entries++;
8621         if (!adp->op || adp->op > op)
8622                 adp->op = op;
8623 }
8624
8625 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8626
8627 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8628 {
8629         struct nft_audit_data *adp, *adn;
8630         char aubuf[AUNFTABLENAMELEN];
8631
8632         list_for_each_entry_safe(adp, adn, adl, list) {
8633                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8634                          generation);
8635                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8636                                 nft2audit_op[adp->op], GFP_KERNEL);
8637                 list_del(&adp->list);
8638                 kfree(adp);
8639         }
8640 }
8641
8642 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8643 {
8644         struct nftables_pernet *nft_net = nft_pernet(net);
8645         struct nft_trans *trans, *next;
8646         struct nft_trans_elem *te;
8647         struct nft_chain *chain;
8648         struct nft_table *table;
8649         unsigned int base_seq;
8650         LIST_HEAD(adl);
8651         int err;
8652
8653         if (list_empty(&nft_net->commit_list)) {
8654                 mutex_unlock(&nft_net->commit_mutex);
8655                 return 0;
8656         }
8657
8658         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8659         if (nf_tables_validate(net) < 0)
8660                 return -EAGAIN;
8661
8662         err = nft_flow_rule_offload_commit(net);
8663         if (err < 0)
8664                 return err;
8665
8666         /* 1.  Allocate space for next generation rules_gen_X[] */
8667         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8668                 int ret;
8669
8670                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8671                 if (ret) {
8672                         nf_tables_commit_chain_prepare_cancel(net);
8673                         nf_tables_commit_audit_free(&adl);
8674                         return ret;
8675                 }
8676                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8677                     trans->msg_type == NFT_MSG_DELRULE) {
8678                         chain = trans->ctx.chain;
8679
8680                         ret = nf_tables_commit_chain_prepare(net, chain);
8681                         if (ret < 0) {
8682                                 nf_tables_commit_chain_prepare_cancel(net);
8683                                 nf_tables_commit_audit_free(&adl);
8684                                 return ret;
8685                         }
8686                 }
8687         }
8688
8689         /* step 2.  Make rules_gen_X visible to packet path */
8690         list_for_each_entry(table, &nft_net->tables, list) {
8691                 list_for_each_entry(chain, &table->chains, list)
8692                         nf_tables_commit_chain(net, chain);
8693         }
8694
8695         /*
8696          * Bump generation counter, invalidate any dump in progress.
8697          * Cannot fail after this point.
8698          */
8699         base_seq = READ_ONCE(nft_net->base_seq);
8700         while (++base_seq == 0)
8701                 ;
8702
8703         WRITE_ONCE(nft_net->base_seq, base_seq);
8704
8705         /* step 3. Start new generation, rules_gen_X now in use. */
8706         net->nft.gencursor = nft_gencursor_next(net);
8707
8708         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8709                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8710                                                trans->msg_type);
8711                 switch (trans->msg_type) {
8712                 case NFT_MSG_NEWTABLE:
8713                         if (nft_trans_table_update(trans)) {
8714                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8715                                         nft_trans_destroy(trans);
8716                                         break;
8717                                 }
8718                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8719                                         nf_tables_table_disable(net, trans->ctx.table);
8720
8721                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8722                         } else {
8723                                 nft_clear(net, trans->ctx.table);
8724                         }
8725                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8726                         nft_trans_destroy(trans);
8727                         break;
8728                 case NFT_MSG_DELTABLE:
8729                         list_del_rcu(&trans->ctx.table->list);
8730                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8731                         break;
8732                 case NFT_MSG_NEWCHAIN:
8733                         if (nft_trans_chain_update(trans)) {
8734                                 nft_chain_commit_update(trans);
8735                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8736                                 /* trans destroyed after rcu grace period */
8737                         } else {
8738                                 nft_chain_commit_drop_policy(trans);
8739                                 nft_clear(net, trans->ctx.chain);
8740                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8741                                 nft_trans_destroy(trans);
8742                         }
8743                         break;
8744                 case NFT_MSG_DELCHAIN:
8745                         nft_chain_del(trans->ctx.chain);
8746                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8747                         nf_tables_unregister_hook(trans->ctx.net,
8748                                                   trans->ctx.table,
8749                                                   trans->ctx.chain);
8750                         break;
8751                 case NFT_MSG_NEWRULE:
8752                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8753                         nf_tables_rule_notify(&trans->ctx,
8754                                               nft_trans_rule(trans),
8755                                               NFT_MSG_NEWRULE);
8756                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8757                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8758
8759                         nft_trans_destroy(trans);
8760                         break;
8761                 case NFT_MSG_DELRULE:
8762                         list_del_rcu(&nft_trans_rule(trans)->list);
8763                         nf_tables_rule_notify(&trans->ctx,
8764                                               nft_trans_rule(trans),
8765                                               NFT_MSG_DELRULE);
8766                         nft_rule_expr_deactivate(&trans->ctx,
8767                                                  nft_trans_rule(trans),
8768                                                  NFT_TRANS_COMMIT);
8769                         break;
8770                 case NFT_MSG_NEWSET:
8771                         nft_clear(net, nft_trans_set(trans));
8772                         /* This avoids hitting -EBUSY when deleting the table
8773                          * from the transaction.
8774                          */
8775                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8776                             !list_empty(&nft_trans_set(trans)->bindings))
8777                                 trans->ctx.table->use--;
8778
8779                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8780                                              NFT_MSG_NEWSET, GFP_KERNEL);
8781                         nft_trans_destroy(trans);
8782                         break;
8783                 case NFT_MSG_DELSET:
8784                         list_del_rcu(&nft_trans_set(trans)->list);
8785                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8786                                              NFT_MSG_DELSET, GFP_KERNEL);
8787                         break;
8788                 case NFT_MSG_NEWSETELEM:
8789                         te = (struct nft_trans_elem *)trans->data;
8790
8791                         nft_setelem_activate(net, te->set, &te->elem);
8792                         nf_tables_setelem_notify(&trans->ctx, te->set,
8793                                                  &te->elem,
8794                                                  NFT_MSG_NEWSETELEM);
8795                         nft_trans_destroy(trans);
8796                         break;
8797                 case NFT_MSG_DELSETELEM:
8798                         te = (struct nft_trans_elem *)trans->data;
8799
8800                         nf_tables_setelem_notify(&trans->ctx, te->set,
8801                                                  &te->elem,
8802                                                  NFT_MSG_DELSETELEM);
8803                         nft_setelem_remove(net, te->set, &te->elem);
8804                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8805                                 atomic_dec(&te->set->nelems);
8806                                 te->set->ndeact--;
8807                         }
8808                         break;
8809                 case NFT_MSG_NEWOBJ:
8810                         if (nft_trans_obj_update(trans)) {
8811                                 nft_obj_commit_update(trans);
8812                                 nf_tables_obj_notify(&trans->ctx,
8813                                                      nft_trans_obj(trans),
8814                                                      NFT_MSG_NEWOBJ);
8815                         } else {
8816                                 nft_clear(net, nft_trans_obj(trans));
8817                                 nf_tables_obj_notify(&trans->ctx,
8818                                                      nft_trans_obj(trans),
8819                                                      NFT_MSG_NEWOBJ);
8820                                 nft_trans_destroy(trans);
8821                         }
8822                         break;
8823                 case NFT_MSG_DELOBJ:
8824                         nft_obj_del(nft_trans_obj(trans));
8825                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8826                                              NFT_MSG_DELOBJ);
8827                         break;
8828                 case NFT_MSG_NEWFLOWTABLE:
8829                         if (nft_trans_flowtable_update(trans)) {
8830                                 nft_trans_flowtable(trans)->data.flags =
8831                                         nft_trans_flowtable_flags(trans);
8832                                 nf_tables_flowtable_notify(&trans->ctx,
8833                                                            nft_trans_flowtable(trans),
8834                                                            &nft_trans_flowtable_hooks(trans),
8835                                                            NFT_MSG_NEWFLOWTABLE);
8836                                 list_splice(&nft_trans_flowtable_hooks(trans),
8837                                             &nft_trans_flowtable(trans)->hook_list);
8838                         } else {
8839                                 nft_clear(net, nft_trans_flowtable(trans));
8840                                 nf_tables_flowtable_notify(&trans->ctx,
8841                                                            nft_trans_flowtable(trans),
8842                                                            &nft_trans_flowtable(trans)->hook_list,
8843                                                            NFT_MSG_NEWFLOWTABLE);
8844                         }
8845                         nft_trans_destroy(trans);
8846                         break;
8847                 case NFT_MSG_DELFLOWTABLE:
8848                         if (nft_trans_flowtable_update(trans)) {
8849                                 nf_tables_flowtable_notify(&trans->ctx,
8850                                                            nft_trans_flowtable(trans),
8851                                                            &nft_trans_flowtable_hooks(trans),
8852                                                            NFT_MSG_DELFLOWTABLE);
8853                                 nft_unregister_flowtable_net_hooks(net,
8854                                                                    &nft_trans_flowtable_hooks(trans));
8855                         } else {
8856                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8857                                 nf_tables_flowtable_notify(&trans->ctx,
8858                                                            nft_trans_flowtable(trans),
8859                                                            &nft_trans_flowtable(trans)->hook_list,
8860                                                            NFT_MSG_DELFLOWTABLE);
8861                                 nft_unregister_flowtable_net_hooks(net,
8862                                                 &nft_trans_flowtable(trans)->hook_list);
8863                         }
8864                         break;
8865                 }
8866         }
8867
8868         nft_commit_notify(net, NETLINK_CB(skb).portid);
8869         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8870         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8871         nf_tables_commit_release(net);
8872
8873         return 0;
8874 }
8875
8876 static void nf_tables_module_autoload(struct net *net)
8877 {
8878         struct nftables_pernet *nft_net = nft_pernet(net);
8879         struct nft_module_request *req, *next;
8880         LIST_HEAD(module_list);
8881
8882         list_splice_init(&nft_net->module_list, &module_list);
8883         mutex_unlock(&nft_net->commit_mutex);
8884         list_for_each_entry_safe(req, next, &module_list, list) {
8885                 request_module("%s", req->module);
8886                 req->done = true;
8887         }
8888         mutex_lock(&nft_net->commit_mutex);
8889         list_splice(&module_list, &nft_net->module_list);
8890 }
8891
8892 static void nf_tables_abort_release(struct nft_trans *trans)
8893 {
8894         switch (trans->msg_type) {
8895         case NFT_MSG_NEWTABLE:
8896                 nf_tables_table_destroy(&trans->ctx);
8897                 break;
8898         case NFT_MSG_NEWCHAIN:
8899                 nf_tables_chain_destroy(&trans->ctx);
8900                 break;
8901         case NFT_MSG_NEWRULE:
8902                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8903                 break;
8904         case NFT_MSG_NEWSET:
8905                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8906                 break;
8907         case NFT_MSG_NEWSETELEM:
8908                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8909                                      nft_trans_elem(trans).priv, true);
8910                 break;
8911         case NFT_MSG_NEWOBJ:
8912                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8913                 break;
8914         case NFT_MSG_NEWFLOWTABLE:
8915                 if (nft_trans_flowtable_update(trans))
8916                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8917                 else
8918                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8919                 break;
8920         }
8921         kfree(trans);
8922 }
8923
8924 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8925 {
8926         struct nftables_pernet *nft_net = nft_pernet(net);
8927         struct nft_trans *trans, *next;
8928         struct nft_trans_elem *te;
8929
8930         if (action == NFNL_ABORT_VALIDATE &&
8931             nf_tables_validate(net) < 0)
8932                 return -EAGAIN;
8933
8934         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
8935                                          list) {
8936                 switch (trans->msg_type) {
8937                 case NFT_MSG_NEWTABLE:
8938                         if (nft_trans_table_update(trans)) {
8939                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8940                                         nft_trans_destroy(trans);
8941                                         break;
8942                                 }
8943                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
8944                                         nf_tables_table_disable(net, trans->ctx.table);
8945                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8946                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
8947                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
8948                                 }
8949                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8950                                 nft_trans_destroy(trans);
8951                         } else {
8952                                 list_del_rcu(&trans->ctx.table->list);
8953                         }
8954                         break;
8955                 case NFT_MSG_DELTABLE:
8956                         nft_clear(trans->ctx.net, trans->ctx.table);
8957                         nft_trans_destroy(trans);
8958                         break;
8959                 case NFT_MSG_NEWCHAIN:
8960                         if (nft_trans_chain_update(trans)) {
8961                                 free_percpu(nft_trans_chain_stats(trans));
8962                                 kfree(nft_trans_chain_name(trans));
8963                                 nft_trans_destroy(trans);
8964                         } else {
8965                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8966                                         nft_trans_destroy(trans);
8967                                         break;
8968                                 }
8969                                 trans->ctx.table->use--;
8970                                 nft_chain_del(trans->ctx.chain);
8971                                 nf_tables_unregister_hook(trans->ctx.net,
8972                                                           trans->ctx.table,
8973                                                           trans->ctx.chain);
8974                         }
8975                         break;
8976                 case NFT_MSG_DELCHAIN:
8977                         trans->ctx.table->use++;
8978                         nft_clear(trans->ctx.net, trans->ctx.chain);
8979                         nft_trans_destroy(trans);
8980                         break;
8981                 case NFT_MSG_NEWRULE:
8982                         trans->ctx.chain->use--;
8983                         list_del_rcu(&nft_trans_rule(trans)->list);
8984                         nft_rule_expr_deactivate(&trans->ctx,
8985                                                  nft_trans_rule(trans),
8986                                                  NFT_TRANS_ABORT);
8987                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8988                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8989                         break;
8990                 case NFT_MSG_DELRULE:
8991                         trans->ctx.chain->use++;
8992                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8993                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8994                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8995                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8996
8997                         nft_trans_destroy(trans);
8998                         break;
8999                 case NFT_MSG_NEWSET:
9000                         trans->ctx.table->use--;
9001                         if (nft_trans_set_bound(trans)) {
9002                                 nft_trans_destroy(trans);
9003                                 break;
9004                         }
9005                         list_del_rcu(&nft_trans_set(trans)->list);
9006                         break;
9007                 case NFT_MSG_DELSET:
9008                         trans->ctx.table->use++;
9009                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9010                         nft_trans_destroy(trans);
9011                         break;
9012                 case NFT_MSG_NEWSETELEM:
9013                         if (nft_trans_elem_set_bound(trans)) {
9014                                 nft_trans_destroy(trans);
9015                                 break;
9016                         }
9017                         te = (struct nft_trans_elem *)trans->data;
9018                         nft_setelem_remove(net, te->set, &te->elem);
9019                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9020                                 atomic_dec(&te->set->nelems);
9021                         break;
9022                 case NFT_MSG_DELSETELEM:
9023                         te = (struct nft_trans_elem *)trans->data;
9024
9025                         nft_setelem_data_activate(net, te->set, &te->elem);
9026                         nft_setelem_activate(net, te->set, &te->elem);
9027                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9028                                 te->set->ndeact--;
9029
9030                         nft_trans_destroy(trans);
9031                         break;
9032                 case NFT_MSG_NEWOBJ:
9033                         if (nft_trans_obj_update(trans)) {
9034                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9035                                 nft_trans_destroy(trans);
9036                         } else {
9037                                 trans->ctx.table->use--;
9038                                 nft_obj_del(nft_trans_obj(trans));
9039                         }
9040                         break;
9041                 case NFT_MSG_DELOBJ:
9042                         trans->ctx.table->use++;
9043                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9044                         nft_trans_destroy(trans);
9045                         break;
9046                 case NFT_MSG_NEWFLOWTABLE:
9047                         if (nft_trans_flowtable_update(trans)) {
9048                                 nft_unregister_flowtable_net_hooks(net,
9049                                                 &nft_trans_flowtable_hooks(trans));
9050                         } else {
9051                                 trans->ctx.table->use--;
9052                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9053                                 nft_unregister_flowtable_net_hooks(net,
9054                                                 &nft_trans_flowtable(trans)->hook_list);
9055                         }
9056                         break;
9057                 case NFT_MSG_DELFLOWTABLE:
9058                         if (nft_trans_flowtable_update(trans)) {
9059                                 list_splice(&nft_trans_flowtable_hooks(trans),
9060                                             &nft_trans_flowtable(trans)->hook_list);
9061                         } else {
9062                                 trans->ctx.table->use++;
9063                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9064                         }
9065                         nft_trans_destroy(trans);
9066                         break;
9067                 }
9068         }
9069
9070         synchronize_rcu();
9071
9072         list_for_each_entry_safe_reverse(trans, next,
9073                                          &nft_net->commit_list, list) {
9074                 list_del(&trans->list);
9075                 nf_tables_abort_release(trans);
9076         }
9077
9078         if (action == NFNL_ABORT_AUTOLOAD)
9079                 nf_tables_module_autoload(net);
9080         else
9081                 nf_tables_module_autoload_cleanup(net);
9082
9083         return 0;
9084 }
9085
9086 static void nf_tables_cleanup(struct net *net)
9087 {
9088         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9089 }
9090
9091 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9092                            enum nfnl_abort_action action)
9093 {
9094         struct nftables_pernet *nft_net = nft_pernet(net);
9095         int ret = __nf_tables_abort(net, action);
9096
9097         mutex_unlock(&nft_net->commit_mutex);
9098
9099         return ret;
9100 }
9101
9102 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9103 {
9104         struct nftables_pernet *nft_net = nft_pernet(net);
9105         bool genid_ok;
9106
9107         mutex_lock(&nft_net->commit_mutex);
9108
9109         genid_ok = genid == 0 || nft_net->base_seq == genid;
9110         if (!genid_ok)
9111                 mutex_unlock(&nft_net->commit_mutex);
9112
9113         /* else, commit mutex has to be released by commit or abort function */
9114         return genid_ok;
9115 }
9116
9117 static const struct nfnetlink_subsystem nf_tables_subsys = {
9118         .name           = "nf_tables",
9119         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9120         .cb_count       = NFT_MSG_MAX,
9121         .cb             = nf_tables_cb,
9122         .commit         = nf_tables_commit,
9123         .abort          = nf_tables_abort,
9124         .cleanup        = nf_tables_cleanup,
9125         .valid_genid    = nf_tables_valid_genid,
9126         .owner          = THIS_MODULE,
9127 };
9128
9129 int nft_chain_validate_dependency(const struct nft_chain *chain,
9130                                   enum nft_chain_types type)
9131 {
9132         const struct nft_base_chain *basechain;
9133
9134         if (nft_is_base_chain(chain)) {
9135                 basechain = nft_base_chain(chain);
9136                 if (basechain->type->type != type)
9137                         return -EOPNOTSUPP;
9138         }
9139         return 0;
9140 }
9141 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9142
9143 int nft_chain_validate_hooks(const struct nft_chain *chain,
9144                              unsigned int hook_flags)
9145 {
9146         struct nft_base_chain *basechain;
9147
9148         if (nft_is_base_chain(chain)) {
9149                 basechain = nft_base_chain(chain);
9150
9151                 if ((1 << basechain->ops.hooknum) & hook_flags)
9152                         return 0;
9153
9154                 return -EOPNOTSUPP;
9155         }
9156
9157         return 0;
9158 }
9159 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9160
9161 /*
9162  * Loop detection - walk through the ruleset beginning at the destination chain
9163  * of a new jump until either the source chain is reached (loop) or all
9164  * reachable chains have been traversed.
9165  *
9166  * The loop check is performed whenever a new jump verdict is added to an
9167  * expression or verdict map or a verdict map is bound to a new chain.
9168  */
9169
9170 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9171                                  const struct nft_chain *chain);
9172
9173 static int nft_check_loops(const struct nft_ctx *ctx,
9174                            const struct nft_set_ext *ext)
9175 {
9176         const struct nft_data *data;
9177         int ret;
9178
9179         data = nft_set_ext_data(ext);
9180         switch (data->verdict.code) {
9181         case NFT_JUMP:
9182         case NFT_GOTO:
9183                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9184                 break;
9185         default:
9186                 ret = 0;
9187                 break;
9188         }
9189
9190         return ret;
9191 }
9192
9193 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9194                                         struct nft_set *set,
9195                                         const struct nft_set_iter *iter,
9196                                         struct nft_set_elem *elem)
9197 {
9198         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9199
9200         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9201             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9202                 return 0;
9203
9204         return nft_check_loops(ctx, ext);
9205 }
9206
9207 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9208                                   struct nft_set *set)
9209 {
9210         u8 genmask = nft_genmask_next(ctx->net);
9211         struct nft_set_elem_catchall *catchall;
9212         struct nft_set_ext *ext;
9213         int ret = 0;
9214
9215         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9216                 ext = nft_set_elem_ext(set, catchall->elem);
9217                 if (!nft_set_elem_active(ext, genmask))
9218                         continue;
9219
9220                 ret = nft_check_loops(ctx, ext);
9221                 if (ret < 0)
9222                         return ret;
9223         }
9224
9225         return ret;
9226 }
9227
9228 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9229                                  const struct nft_chain *chain)
9230 {
9231         const struct nft_rule *rule;
9232         const struct nft_expr *expr, *last;
9233         struct nft_set *set;
9234         struct nft_set_binding *binding;
9235         struct nft_set_iter iter;
9236
9237         if (ctx->chain == chain)
9238                 return -ELOOP;
9239
9240         list_for_each_entry(rule, &chain->rules, list) {
9241                 nft_rule_for_each_expr(expr, last, rule) {
9242                         struct nft_immediate_expr *priv;
9243                         const struct nft_data *data;
9244                         int err;
9245
9246                         if (strcmp(expr->ops->type->name, "immediate"))
9247                                 continue;
9248
9249                         priv = nft_expr_priv(expr);
9250                         if (priv->dreg != NFT_REG_VERDICT)
9251                                 continue;
9252
9253                         data = &priv->data;
9254                         switch (data->verdict.code) {
9255                         case NFT_JUMP:
9256                         case NFT_GOTO:
9257                                 err = nf_tables_check_loops(ctx,
9258                                                         data->verdict.chain);
9259                                 if (err < 0)
9260                                         return err;
9261                                 break;
9262                         default:
9263                                 break;
9264                         }
9265                 }
9266         }
9267
9268         list_for_each_entry(set, &ctx->table->sets, list) {
9269                 if (!nft_is_active_next(ctx->net, set))
9270                         continue;
9271                 if (!(set->flags & NFT_SET_MAP) ||
9272                     set->dtype != NFT_DATA_VERDICT)
9273                         continue;
9274
9275                 list_for_each_entry(binding, &set->bindings, list) {
9276                         if (!(binding->flags & NFT_SET_MAP) ||
9277                             binding->chain != chain)
9278                                 continue;
9279
9280                         iter.genmask    = nft_genmask_next(ctx->net);
9281                         iter.skip       = 0;
9282                         iter.count      = 0;
9283                         iter.err        = 0;
9284                         iter.fn         = nf_tables_loop_check_setelem;
9285
9286                         set->ops->walk(ctx, set, &iter);
9287                         if (!iter.err)
9288                                 iter.err = nft_set_catchall_loops(ctx, set);
9289
9290                         if (iter.err < 0)
9291                                 return iter.err;
9292                 }
9293         }
9294
9295         return 0;
9296 }
9297
9298 /**
9299  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9300  *
9301  *      @attr: netlink attribute to fetch value from
9302  *      @max: maximum value to be stored in dest
9303  *      @dest: pointer to the variable
9304  *
9305  *      Parse, check and store a given u32 netlink attribute into variable.
9306  *      This function returns -ERANGE if the value goes over maximum value.
9307  *      Otherwise a 0 is returned and the attribute value is stored in the
9308  *      destination variable.
9309  */
9310 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9311 {
9312         u32 val;
9313
9314         val = ntohl(nla_get_be32(attr));
9315         if (val > max)
9316                 return -ERANGE;
9317
9318         *dest = val;
9319         return 0;
9320 }
9321 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9322
9323 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9324 {
9325         unsigned int reg;
9326
9327         reg = ntohl(nla_get_be32(attr));
9328         switch (reg) {
9329         case NFT_REG_VERDICT...NFT_REG_4:
9330                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9331                 break;
9332         case NFT_REG32_00...NFT_REG32_15:
9333                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9334                 break;
9335         default:
9336                 return -ERANGE;
9337         }
9338
9339         return 0;
9340 }
9341
9342 /**
9343  *      nft_dump_register - dump a register value to a netlink attribute
9344  *
9345  *      @skb: socket buffer
9346  *      @attr: attribute number
9347  *      @reg: register number
9348  *
9349  *      Construct a netlink attribute containing the register number. For
9350  *      compatibility reasons, register numbers being a multiple of 4 are
9351  *      translated to the corresponding 128 bit register numbers.
9352  */
9353 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9354 {
9355         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9356                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9357         else
9358                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9359
9360         return nla_put_be32(skb, attr, htonl(reg));
9361 }
9362 EXPORT_SYMBOL_GPL(nft_dump_register);
9363
9364 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9365 {
9366         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9367                 return -EINVAL;
9368         if (len == 0)
9369                 return -EINVAL;
9370         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9371                 return -ERANGE;
9372
9373         return 0;
9374 }
9375
9376 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9377 {
9378         u32 reg;
9379         int err;
9380
9381         err = nft_parse_register(attr, &reg);
9382         if (err < 0)
9383                 return err;
9384
9385         err = nft_validate_register_load(reg, len);
9386         if (err < 0)
9387                 return err;
9388
9389         *sreg = reg;
9390         return 0;
9391 }
9392 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9393
9394 static int nft_validate_register_store(const struct nft_ctx *ctx,
9395                                        enum nft_registers reg,
9396                                        const struct nft_data *data,
9397                                        enum nft_data_types type,
9398                                        unsigned int len)
9399 {
9400         int err;
9401
9402         switch (reg) {
9403         case NFT_REG_VERDICT:
9404                 if (type != NFT_DATA_VERDICT)
9405                         return -EINVAL;
9406
9407                 if (data != NULL &&
9408                     (data->verdict.code == NFT_GOTO ||
9409                      data->verdict.code == NFT_JUMP)) {
9410                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9411                         if (err < 0)
9412                                 return err;
9413                 }
9414
9415                 return 0;
9416         default:
9417                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9418                         return -EINVAL;
9419                 if (len == 0)
9420                         return -EINVAL;
9421                 if (reg * NFT_REG32_SIZE + len >
9422                     sizeof_field(struct nft_regs, data))
9423                         return -ERANGE;
9424
9425                 if (data != NULL && type != NFT_DATA_VALUE)
9426                         return -EINVAL;
9427                 return 0;
9428         }
9429 }
9430
9431 int nft_parse_register_store(const struct nft_ctx *ctx,
9432                              const struct nlattr *attr, u8 *dreg,
9433                              const struct nft_data *data,
9434                              enum nft_data_types type, unsigned int len)
9435 {
9436         int err;
9437         u32 reg;
9438
9439         err = nft_parse_register(attr, &reg);
9440         if (err < 0)
9441                 return err;
9442
9443         err = nft_validate_register_store(ctx, reg, data, type, len);
9444         if (err < 0)
9445                 return err;
9446
9447         *dreg = reg;
9448         return 0;
9449 }
9450 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9451
9452 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9453         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9454         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9455                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9456         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9457 };
9458
9459 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9460                             struct nft_data_desc *desc, const struct nlattr *nla)
9461 {
9462         u8 genmask = nft_genmask_next(ctx->net);
9463         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9464         struct nft_chain *chain;
9465         int err;
9466
9467         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9468                                           nft_verdict_policy, NULL);
9469         if (err < 0)
9470                 return err;
9471
9472         if (!tb[NFTA_VERDICT_CODE])
9473                 return -EINVAL;
9474         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9475
9476         switch (data->verdict.code) {
9477         default:
9478                 switch (data->verdict.code & NF_VERDICT_MASK) {
9479                 case NF_ACCEPT:
9480                 case NF_DROP:
9481                 case NF_QUEUE:
9482                         break;
9483                 default:
9484                         return -EINVAL;
9485                 }
9486                 fallthrough;
9487         case NFT_CONTINUE:
9488         case NFT_BREAK:
9489         case NFT_RETURN:
9490                 break;
9491         case NFT_JUMP:
9492         case NFT_GOTO:
9493                 if (tb[NFTA_VERDICT_CHAIN]) {
9494                         chain = nft_chain_lookup(ctx->net, ctx->table,
9495                                                  tb[NFTA_VERDICT_CHAIN],
9496                                                  genmask);
9497                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9498                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9499                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9500                         if (IS_ERR(chain))
9501                                 return PTR_ERR(chain);
9502                 } else {
9503                         return -EINVAL;
9504                 }
9505
9506                 if (IS_ERR(chain))
9507                         return PTR_ERR(chain);
9508                 if (nft_is_base_chain(chain))
9509                         return -EOPNOTSUPP;
9510                 if (nft_chain_is_bound(chain))
9511                         return -EINVAL;
9512                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9513                     chain->flags & NFT_CHAIN_BINDING)
9514                         return -EINVAL;
9515
9516                 chain->use++;
9517                 data->verdict.chain = chain;
9518                 break;
9519         }
9520
9521         desc->len = sizeof(data->verdict);
9522
9523         return 0;
9524 }
9525
9526 static void nft_verdict_uninit(const struct nft_data *data)
9527 {
9528         struct nft_chain *chain;
9529         struct nft_rule *rule;
9530
9531         switch (data->verdict.code) {
9532         case NFT_JUMP:
9533         case NFT_GOTO:
9534                 chain = data->verdict.chain;
9535                 chain->use--;
9536
9537                 if (!nft_chain_is_bound(chain))
9538                         break;
9539
9540                 chain->table->use--;
9541                 list_for_each_entry(rule, &chain->rules, list)
9542                         chain->use--;
9543
9544                 nft_chain_del(chain);
9545                 break;
9546         }
9547 }
9548
9549 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9550 {
9551         struct nlattr *nest;
9552
9553         nest = nla_nest_start_noflag(skb, type);
9554         if (!nest)
9555                 goto nla_put_failure;
9556
9557         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9558                 goto nla_put_failure;
9559
9560         switch (v->code) {
9561         case NFT_JUMP:
9562         case NFT_GOTO:
9563                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9564                                    v->chain->name))
9565                         goto nla_put_failure;
9566         }
9567         nla_nest_end(skb, nest);
9568         return 0;
9569
9570 nla_put_failure:
9571         return -1;
9572 }
9573
9574 static int nft_value_init(const struct nft_ctx *ctx,
9575                           struct nft_data *data, struct nft_data_desc *desc,
9576                           const struct nlattr *nla)
9577 {
9578         unsigned int len;
9579
9580         len = nla_len(nla);
9581         if (len == 0)
9582                 return -EINVAL;
9583         if (len > desc->size)
9584                 return -EOVERFLOW;
9585         if (desc->len) {
9586                 if (len != desc->len)
9587                         return -EINVAL;
9588         } else {
9589                 desc->len = len;
9590         }
9591
9592         nla_memcpy(data->data, nla, len);
9593
9594         return 0;
9595 }
9596
9597 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9598                           unsigned int len)
9599 {
9600         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9601 }
9602
9603 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9604         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9605         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9606 };
9607
9608 /**
9609  *      nft_data_init - parse nf_tables data netlink attributes
9610  *
9611  *      @ctx: context of the expression using the data
9612  *      @data: destination struct nft_data
9613  *      @desc: data description
9614  *      @nla: netlink attribute containing data
9615  *
9616  *      Parse the netlink data attributes and initialize a struct nft_data.
9617  *      The type and length of data are returned in the data description.
9618  *
9619  *      The caller can indicate that it only wants to accept data of type
9620  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9621  */
9622 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9623                   struct nft_data_desc *desc, const struct nlattr *nla)
9624 {
9625         struct nlattr *tb[NFTA_DATA_MAX + 1];
9626         int err;
9627
9628         if (WARN_ON_ONCE(!desc->size))
9629                 return -EINVAL;
9630
9631         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9632                                           nft_data_policy, NULL);
9633         if (err < 0)
9634                 return err;
9635
9636         if (tb[NFTA_DATA_VALUE]) {
9637                 if (desc->type != NFT_DATA_VALUE)
9638                         return -EINVAL;
9639
9640                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9641         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9642                 if (desc->type != NFT_DATA_VERDICT)
9643                         return -EINVAL;
9644
9645                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9646         } else {
9647                 err = -EINVAL;
9648         }
9649
9650         return err;
9651 }
9652 EXPORT_SYMBOL_GPL(nft_data_init);
9653
9654 /**
9655  *      nft_data_release - release a nft_data item
9656  *
9657  *      @data: struct nft_data to release
9658  *      @type: type of data
9659  *
9660  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9661  *      all others need to be released by calling this function.
9662  */
9663 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9664 {
9665         if (type < NFT_DATA_VERDICT)
9666                 return;
9667         switch (type) {
9668         case NFT_DATA_VERDICT:
9669                 return nft_verdict_uninit(data);
9670         default:
9671                 WARN_ON(1);
9672         }
9673 }
9674 EXPORT_SYMBOL_GPL(nft_data_release);
9675
9676 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9677                   enum nft_data_types type, unsigned int len)
9678 {
9679         struct nlattr *nest;
9680         int err;
9681
9682         nest = nla_nest_start_noflag(skb, attr);
9683         if (nest == NULL)
9684                 return -1;
9685
9686         switch (type) {
9687         case NFT_DATA_VALUE:
9688                 err = nft_value_dump(skb, data, len);
9689                 break;
9690         case NFT_DATA_VERDICT:
9691                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9692                 break;
9693         default:
9694                 err = -EINVAL;
9695                 WARN_ON(1);
9696         }
9697
9698         nla_nest_end(skb, nest);
9699         return err;
9700 }
9701 EXPORT_SYMBOL_GPL(nft_data_dump);
9702
9703 int __nft_release_basechain(struct nft_ctx *ctx)
9704 {
9705         struct nft_rule *rule, *nr;
9706
9707         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9708                 return 0;
9709
9710         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9711         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9712                 list_del(&rule->list);
9713                 ctx->chain->use--;
9714                 nf_tables_rule_release(ctx, rule);
9715         }
9716         nft_chain_del(ctx->chain);
9717         ctx->table->use--;
9718         nf_tables_chain_destroy(ctx);
9719
9720         return 0;
9721 }
9722 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9723
9724 static void __nft_release_hook(struct net *net, struct nft_table *table)
9725 {
9726         struct nft_flowtable *flowtable;
9727         struct nft_chain *chain;
9728
9729         list_for_each_entry(chain, &table->chains, list)
9730                 __nf_tables_unregister_hook(net, table, chain, true);
9731         list_for_each_entry(flowtable, &table->flowtables, list)
9732                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9733                                                      true);
9734 }
9735
9736 static void __nft_release_hooks(struct net *net)
9737 {
9738         struct nftables_pernet *nft_net = nft_pernet(net);
9739         struct nft_table *table;
9740
9741         list_for_each_entry(table, &nft_net->tables, list) {
9742                 if (nft_table_has_owner(table))
9743                         continue;
9744
9745                 __nft_release_hook(net, table);
9746         }
9747 }
9748
9749 static void __nft_release_table(struct net *net, struct nft_table *table)
9750 {
9751         struct nft_flowtable *flowtable, *nf;
9752         struct nft_chain *chain, *nc;
9753         struct nft_object *obj, *ne;
9754         struct nft_rule *rule, *nr;
9755         struct nft_set *set, *ns;
9756         struct nft_ctx ctx = {
9757                 .net    = net,
9758                 .family = NFPROTO_NETDEV,
9759         };
9760
9761         ctx.family = table->family;
9762         ctx.table = table;
9763         list_for_each_entry(chain, &table->chains, list) {
9764                 ctx.chain = chain;
9765                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9766                         list_del(&rule->list);
9767                         chain->use--;
9768                         nf_tables_rule_release(&ctx, rule);
9769                 }
9770         }
9771         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9772                 list_del(&flowtable->list);
9773                 table->use--;
9774                 nf_tables_flowtable_destroy(flowtable);
9775         }
9776         list_for_each_entry_safe(set, ns, &table->sets, list) {
9777                 list_del(&set->list);
9778                 table->use--;
9779                 nft_set_destroy(&ctx, set);
9780         }
9781         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9782                 nft_obj_del(obj);
9783                 table->use--;
9784                 nft_obj_destroy(&ctx, obj);
9785         }
9786         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9787                 ctx.chain = chain;
9788                 nft_chain_del(chain);
9789                 table->use--;
9790                 nf_tables_chain_destroy(&ctx);
9791         }
9792         nf_tables_table_destroy(&ctx);
9793 }
9794
9795 static void __nft_release_tables(struct net *net)
9796 {
9797         struct nftables_pernet *nft_net = nft_pernet(net);
9798         struct nft_table *table, *nt;
9799
9800         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9801                 if (nft_table_has_owner(table))
9802                         continue;
9803
9804                 list_del(&table->list);
9805
9806                 __nft_release_table(net, table);
9807         }
9808 }
9809
9810 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9811                             void *ptr)
9812 {
9813         struct nft_table *table, *to_delete[8];
9814         struct nftables_pernet *nft_net;
9815         struct netlink_notify *n = ptr;
9816         struct net *net = n->net;
9817         unsigned int deleted;
9818         bool restart = false;
9819
9820         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9821                 return NOTIFY_DONE;
9822
9823         nft_net = nft_pernet(net);
9824         deleted = 0;
9825         mutex_lock(&nft_net->commit_mutex);
9826 again:
9827         list_for_each_entry(table, &nft_net->tables, list) {
9828                 if (nft_table_has_owner(table) &&
9829                     n->portid == table->nlpid) {
9830                         __nft_release_hook(net, table);
9831                         list_del_rcu(&table->list);
9832                         to_delete[deleted++] = table;
9833                         if (deleted >= ARRAY_SIZE(to_delete))
9834                                 break;
9835                 }
9836         }
9837         if (deleted) {
9838                 restart = deleted >= ARRAY_SIZE(to_delete);
9839                 synchronize_rcu();
9840                 while (deleted)
9841                         __nft_release_table(net, to_delete[--deleted]);
9842
9843                 if (restart)
9844                         goto again;
9845         }
9846         mutex_unlock(&nft_net->commit_mutex);
9847
9848         return NOTIFY_DONE;
9849 }
9850
9851 static struct notifier_block nft_nl_notifier = {
9852         .notifier_call  = nft_rcv_nl_event,
9853 };
9854
9855 static int __net_init nf_tables_init_net(struct net *net)
9856 {
9857         struct nftables_pernet *nft_net = nft_pernet(net);
9858
9859         INIT_LIST_HEAD(&nft_net->tables);
9860         INIT_LIST_HEAD(&nft_net->commit_list);
9861         INIT_LIST_HEAD(&nft_net->module_list);
9862         INIT_LIST_HEAD(&nft_net->notify_list);
9863         mutex_init(&nft_net->commit_mutex);
9864         nft_net->base_seq = 1;
9865         nft_net->validate_state = NFT_VALIDATE_SKIP;
9866
9867         return 0;
9868 }
9869
9870 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9871 {
9872         struct nftables_pernet *nft_net = nft_pernet(net);
9873
9874         mutex_lock(&nft_net->commit_mutex);
9875         __nft_release_hooks(net);
9876         mutex_unlock(&nft_net->commit_mutex);
9877 }
9878
9879 static void __net_exit nf_tables_exit_net(struct net *net)
9880 {
9881         struct nftables_pernet *nft_net = nft_pernet(net);
9882
9883         mutex_lock(&nft_net->commit_mutex);
9884         if (!list_empty(&nft_net->commit_list))
9885                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9886         __nft_release_tables(net);
9887         mutex_unlock(&nft_net->commit_mutex);
9888         WARN_ON_ONCE(!list_empty(&nft_net->tables));
9889         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9890         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9891 }
9892
9893 static struct pernet_operations nf_tables_net_ops = {
9894         .init           = nf_tables_init_net,
9895         .pre_exit       = nf_tables_pre_exit_net,
9896         .exit           = nf_tables_exit_net,
9897         .id             = &nf_tables_net_id,
9898         .size           = sizeof(struct nftables_pernet),
9899 };
9900
9901 static int __init nf_tables_module_init(void)
9902 {
9903         int err;
9904
9905         err = register_pernet_subsys(&nf_tables_net_ops);
9906         if (err < 0)
9907                 return err;
9908
9909         err = nft_chain_filter_init();
9910         if (err < 0)
9911                 goto err_chain_filter;
9912
9913         err = nf_tables_core_module_init();
9914         if (err < 0)
9915                 goto err_core_module;
9916
9917         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9918         if (err < 0)
9919                 goto err_netdev_notifier;
9920
9921         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9922         if (err < 0)
9923                 goto err_rht_objname;
9924
9925         err = nft_offload_init();
9926         if (err < 0)
9927                 goto err_offload;
9928
9929         err = netlink_register_notifier(&nft_nl_notifier);
9930         if (err < 0)
9931                 goto err_netlink_notifier;
9932
9933         /* must be last */
9934         err = nfnetlink_subsys_register(&nf_tables_subsys);
9935         if (err < 0)
9936                 goto err_nfnl_subsys;
9937
9938         nft_chain_route_init();
9939
9940         return err;
9941
9942 err_nfnl_subsys:
9943         netlink_unregister_notifier(&nft_nl_notifier);
9944 err_netlink_notifier:
9945         nft_offload_exit();
9946 err_offload:
9947         rhltable_destroy(&nft_objname_ht);
9948 err_rht_objname:
9949         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9950 err_netdev_notifier:
9951         nf_tables_core_module_exit();
9952 err_core_module:
9953         nft_chain_filter_fini();
9954 err_chain_filter:
9955         unregister_pernet_subsys(&nf_tables_net_ops);
9956         return err;
9957 }
9958
9959 static void __exit nf_tables_module_exit(void)
9960 {
9961         nfnetlink_subsys_unregister(&nf_tables_subsys);
9962         netlink_unregister_notifier(&nft_nl_notifier);
9963         nft_offload_exit();
9964         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9965         nft_chain_filter_fini();
9966         nft_chain_route_fini();
9967         unregister_pernet_subsys(&nf_tables_net_ops);
9968         cancel_work_sync(&trans_destroy_work);
9969         rcu_barrier();
9970         rhltable_destroy(&nft_objname_ht);
9971         nf_tables_core_module_exit();
9972 }
9973
9974 module_init(nf_tables_module_init);
9975 module_exit(nf_tables_module_exit);
9976
9977 MODULE_LICENSE("GPL");
9978 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9979 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);