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