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 static LIST_HEAD(nf_tables_expressions);
  29 static LIST_HEAD(nf_tables_objects);
  30 static LIST_HEAD(nf_tables_flowtables);
  31 static LIST_HEAD(nf_tables_destroy_list);
  32 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  33 static u64 table_handle;
  34
  35 enum {
  36         NFT_VALIDATE_SKIP       = 0,
  37         NFT_VALIDATE_NEED,
  38         NFT_VALIDATE_DO,
  39 };
  40
  41 static struct rhltable nft_objname_ht;
  42
  43 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  44 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  45 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  46
  47 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  48 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  49 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  50
  51 static const struct rhashtable_params nft_chain_ht_params = {
  52         .head_offset            = offsetof(struct nft_chain, rhlhead),
  53         .key_offset             = offsetof(struct nft_chain, name),
  54         .hashfn                 = nft_chain_hash,
  55         .obj_hashfn             = nft_chain_hash_obj,
  56         .obj_cmpfn              = nft_chain_hash_cmp,
  57         .automatic_shrinking    = true,
  58 };
  59
  60 static const struct rhashtable_params nft_objname_ht_params = {
  61         .head_offset            = offsetof(struct nft_object, rhlhead),
  62         .key_offset             = offsetof(struct nft_object, key),
  63         .hashfn                 = nft_objname_hash,
  64         .obj_hashfn             = nft_objname_hash_obj,
  65         .obj_cmpfn              = nft_objname_hash_cmp,
  66         .automatic_shrinking    = true,
  67 };
  68
  69 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
  70 {
  71         switch (net->nft.validate_state) {
  72         case NFT_VALIDATE_SKIP:
  73                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
  74                 break;
  75         case NFT_VALIDATE_NEED:
  76                 break;
  77         case NFT_VALIDATE_DO:
  78                 if (new_validate_state == NFT_VALIDATE_NEED)
  79                         return;
  80         }
  81
  82         net->nft.validate_state = new_validate_state;
  83 }
  84 static void nf_tables_trans_destroy_work(struct work_struct *w);
  85 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
  86
  87 static void nft_ctx_init(struct nft_ctx *ctx,
  88                          struct net *net,
  89                          const struct sk_buff *skb,
  90                          const struct nlmsghdr *nlh,
  91                          u8 family,
  92                          struct nft_table *table,
  93                          struct nft_chain *chain,
  94                          const struct nlattr * const *nla)
  95 {
  96         ctx->net        = net;
  97         ctx->family     = family;
  98         ctx->level      = 0;
  99         ctx->table      = table;
 100         ctx->chain      = chain;
 101         ctx->nla        = nla;
 102         ctx->portid     = NETLINK_CB(skb).portid;
 103         ctx->report     = nlmsg_report(nlh);
 104         ctx->flags      = nlh->nlmsg_flags;
 105         ctx->seq        = nlh->nlmsg_seq;
 106 }
 107
 108 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 109                                              int msg_type, u32 size, gfp_t gfp)
 110 {
 111         struct nft_trans *trans;
 112
 113         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 114         if (trans == NULL)
 115                 return NULL;
 116
 117         trans->msg_type = msg_type;
 118         trans->ctx      = *ctx;
 119
 120         return trans;
 121 }
 122
 123 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 124                                          int msg_type, u32 size)
 125 {
 126         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 127 }
 128
 129 static void nft_trans_destroy(struct nft_trans *trans)
 130 {
 131         list_del(&trans->list);
 132         kfree(trans);
 133 }
 134
 135 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 136 {
 137         struct net *net = ctx->net;
 138         struct nft_trans *trans;
 139
 140         if (!nft_set_is_anonymous(set))
 141                 return;
 142
 143         list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
 144                 switch (trans->msg_type) {
 145                 case NFT_MSG_NEWSET:
 146                         if (nft_trans_set(trans) == set)
 147                                 nft_trans_set_bound(trans) = true;
 148                         break;
 149                 case NFT_MSG_NEWSETELEM:
 150                         if (nft_trans_elem_set(trans) == set)
 151                                 nft_trans_elem_set_bound(trans) = true;
 152                         break;
 153                 }
 154         }
 155 }
 156
 157 static int nft_netdev_register_hooks(struct net *net,
 158                                      struct list_head *hook_list)
 159 {
 160         struct nft_hook *hook;
 161         int err, j;
 162
 163         j = 0;
 164         list_for_each_entry(hook, hook_list, list) {
 165                 err = nf_register_net_hook(net, &hook->ops);
 166                 if (err < 0)
 167                         goto err_register;
 168
 169                 j++;
 170         }
 171         return 0;
 172
 173 err_register:
 174         list_for_each_entry(hook, hook_list, list) {
 175                 if (j-- <= 0)
 176                         break;
 177
 178                 nf_unregister_net_hook(net, &hook->ops);
 179         }
 180         return err;
 181 }
 182
 183 static void nft_netdev_unregister_hooks(struct net *net,
 184                                         struct list_head *hook_list)
 185 {
 186         struct nft_hook *hook;
 187
 188         list_for_each_entry(hook, hook_list, list)
 189                 nf_unregister_net_hook(net, &hook->ops);
 190 }
 191
 192 static int nf_tables_register_hook(struct net *net,
 193                                    const struct nft_table *table,
 194                                    struct nft_chain *chain)
 195 {
 196         struct nft_base_chain *basechain;
 197         const struct nf_hook_ops *ops;
 198
 199         if (table->flags & NFT_TABLE_F_DORMANT ||
 200             !nft_is_base_chain(chain))
 201                 return 0;
 202
 203         basechain = nft_base_chain(chain);
 204         ops = &basechain->ops;
 205
 206         if (basechain->type->ops_register)
 207                 return basechain->type->ops_register(net, ops);
 208
 209         if (table->family == NFPROTO_NETDEV)
 210                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 211
 212         return nf_register_net_hook(net, &basechain->ops);
 213 }
 214
 215 static void nf_tables_unregister_hook(struct net *net,
 216                                       const struct nft_table *table,
 217                                       struct nft_chain *chain)
 218 {
 219         struct nft_base_chain *basechain;
 220         const struct nf_hook_ops *ops;
 221
 222         if (table->flags & NFT_TABLE_F_DORMANT ||
 223             !nft_is_base_chain(chain))
 224                 return;
 225         basechain = nft_base_chain(chain);
 226         ops = &basechain->ops;
 227
 228         if (basechain->type->ops_unregister)
 229                 return basechain->type->ops_unregister(net, ops);
 230
 231         if (table->family == NFPROTO_NETDEV)
 232                 nft_netdev_unregister_hooks(net, &basechain->hook_list);
 233         else
 234                 nf_unregister_net_hook(net, &basechain->ops);
 235 }
 236
 237 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 238 {
 239         struct nft_trans *trans;
 240
 241         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 242         if (trans == NULL)
 243                 return -ENOMEM;
 244
 245         if (msg_type == NFT_MSG_NEWTABLE)
 246                 nft_activate_next(ctx->net, ctx->table);
 247
 248         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 249         return 0;
 250 }
 251
 252 static int nft_deltable(struct nft_ctx *ctx)
 253 {
 254         int err;
 255
 256         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 257         if (err < 0)
 258                 return err;
 259
 260         nft_deactivate_next(ctx->net, ctx->table);
 261         return err;
 262 }
 263
 264 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 265 {
 266         struct nft_trans *trans;
 267
 268         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 269         if (trans == NULL)
 270                 return ERR_PTR(-ENOMEM);
 271
 272         if (msg_type == NFT_MSG_NEWCHAIN) {
 273                 nft_activate_next(ctx->net, ctx->chain);
 274
 275                 if (ctx->nla[NFTA_CHAIN_ID]) {
 276                         nft_trans_chain_id(trans) =
 277                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 278                 }
 279         }
 280
 281         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 282         return trans;
 283 }
 284
 285 static int nft_delchain(struct nft_ctx *ctx)
 286 {
 287         struct nft_trans *trans;
 288
 289         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 290         if (IS_ERR(trans))
 291                 return PTR_ERR(trans);
 292
 293         ctx->table->use--;
 294         nft_deactivate_next(ctx->net, ctx->chain);
 295
 296         return 0;
 297 }
 298
 299 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 300                                    struct nft_rule *rule)
 301 {
 302         struct nft_expr *expr;
 303
 304         expr = nft_expr_first(rule);
 305         while (expr != nft_expr_last(rule) && expr->ops) {
 306                 if (expr->ops->activate)
 307                         expr->ops->activate(ctx, expr);
 308
 309                 expr = nft_expr_next(expr);
 310         }
 311 }
 312
 313 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 314                                      struct nft_rule *rule,
 315                                      enum nft_trans_phase phase)
 316 {
 317         struct nft_expr *expr;
 318
 319         expr = nft_expr_first(rule);
 320         while (expr != nft_expr_last(rule) && expr->ops) {
 321                 if (expr->ops->deactivate)
 322                         expr->ops->deactivate(ctx, expr, phase);
 323
 324                 expr = nft_expr_next(expr);
 325         }
 326 }
 327
 328 static int
 329 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 330 {
 331         /* You cannot delete the same rule twice */
 332         if (nft_is_active_next(ctx->net, rule)) {
 333                 nft_deactivate_next(ctx->net, rule);
 334                 ctx->chain->use--;
 335                 return 0;
 336         }
 337         return -ENOENT;
 338 }
 339
 340 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 341                                             struct nft_rule *rule)
 342 {
 343         struct nft_trans *trans;
 344
 345         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 346         if (trans == NULL)
 347                 return NULL;
 348
 349         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 350                 nft_trans_rule_id(trans) =
 351                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 352         }
 353         nft_trans_rule(trans) = rule;
 354         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 355
 356         return trans;
 357 }
 358
 359 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 360 {
 361         struct nft_flow_rule *flow;
 362         struct nft_trans *trans;
 363         int err;
 364
 365         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 366         if (trans == NULL)
 367                 return -ENOMEM;
 368
 369         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 370                 flow = nft_flow_rule_create(ctx->net, rule);
 371                 if (IS_ERR(flow)) {
 372                         nft_trans_destroy(trans);
 373                         return PTR_ERR(flow);
 374                 }
 375
 376                 nft_trans_flow_rule(trans) = flow;
 377         }
 378
 379         err = nf_tables_delrule_deactivate(ctx, rule);
 380         if (err < 0) {
 381                 nft_trans_destroy(trans);
 382                 return err;
 383         }
 384         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 385
 386         return 0;
 387 }
 388
 389 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 390 {
 391         struct nft_rule *rule;
 392         int err;
 393
 394         list_for_each_entry(rule, &ctx->chain->rules, list) {
 395                 if (!nft_is_active_next(ctx->net, rule))
 396                         continue;
 397
 398                 err = nft_delrule(ctx, rule);
 399                 if (err < 0)
 400                         return err;
 401         }
 402         return 0;
 403 }
 404
 405 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 406                              struct nft_set *set)
 407 {
 408         struct nft_trans *trans;
 409
 410         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 411         if (trans == NULL)
 412                 return -ENOMEM;
 413
 414         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 415                 nft_trans_set_id(trans) =
 416                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 417                 nft_activate_next(ctx->net, set);
 418         }
 419         nft_trans_set(trans) = set;
 420         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 421
 422         return 0;
 423 }
 424
 425 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 426 {
 427         int err;
 428
 429         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 430         if (err < 0)
 431                 return err;
 432
 433         nft_deactivate_next(ctx->net, set);
 434         ctx->table->use--;
 435
 436         return err;
 437 }
 438
 439 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 440                              struct nft_object *obj)
 441 {
 442         struct nft_trans *trans;
 443
 444         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 445         if (trans == NULL)
 446                 return -ENOMEM;
 447
 448         if (msg_type == NFT_MSG_NEWOBJ)
 449                 nft_activate_next(ctx->net, obj);
 450
 451         nft_trans_obj(trans) = obj;
 452         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 453
 454         return 0;
 455 }
 456
 457 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 458 {
 459         int err;
 460
 461         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 462         if (err < 0)
 463                 return err;
 464
 465         nft_deactivate_next(ctx->net, obj);
 466         ctx->table->use--;
 467
 468         return err;
 469 }
 470
 471 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 472                                    struct nft_flowtable *flowtable)
 473 {
 474         struct nft_trans *trans;
 475
 476         trans = nft_trans_alloc(ctx, msg_type,
 477                                 sizeof(struct nft_trans_flowtable));
 478         if (trans == NULL)
 479                 return -ENOMEM;
 480
 481         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 482                 nft_activate_next(ctx->net, flowtable);
 483
 484         nft_trans_flowtable(trans) = flowtable;
 485         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 486
 487         return 0;
 488 }
 489
 490 static int nft_delflowtable(struct nft_ctx *ctx,
 491                             struct nft_flowtable *flowtable)
 492 {
 493         int err;
 494
 495         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 496         if (err < 0)
 497                 return err;
 498
 499         nft_deactivate_next(ctx->net, flowtable);
 500         ctx->table->use--;
 501
 502         return err;
 503 }
 504
 505 /*
 506  * Tables
 507  */
 508
 509 static struct nft_table *nft_table_lookup(const struct net *net,
 510                                           const struct nlattr *nla,
 511                                           u8 family, u8 genmask)
 512 {
 513         struct nft_table *table;
 514
 515         if (nla == NULL)
 516                 return ERR_PTR(-EINVAL);
 517
 518         list_for_each_entry_rcu(table, &net->nft.tables, list,
 519                                 lockdep_is_held(&net->nft.commit_mutex)) {
 520                 if (!nla_strcmp(nla, table->name) &&
 521                     table->family == family &&
 522                     nft_active_genmask(table, genmask))
 523                         return table;
 524         }
 525
 526         return ERR_PTR(-ENOENT);
 527 }
 528
 529 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 530                                                    const struct nlattr *nla,
 531                                                    u8 genmask)
 532 {
 533         struct nft_table *table;
 534
 535         list_for_each_entry(table, &net->nft.tables, list) {
 536                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 537                     nft_active_genmask(table, genmask))
 538                         return table;
 539         }
 540
 541         return ERR_PTR(-ENOENT);
 542 }
 543
 544 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 545 {
 546         return ++table->hgenerator;
 547 }
 548
 549 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 550
 551 static const struct nft_chain_type *
 552 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 553 {
 554         if (family >= NFPROTO_NUMPROTO ||
 555             type >= NFT_CHAIN_T_MAX)
 556                 return NULL;
 557
 558         return chain_type[family][type];
 559 }
 560
 561 static const struct nft_chain_type *
 562 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 563 {
 564         const struct nft_chain_type *type;
 565         int i;
 566
 567         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 568                 type = __nft_chain_type_get(family, i);
 569                 if (!type)
 570                         continue;
 571                 if (!nla_strcmp(nla, type->name))
 572                         return type;
 573         }
 574         return NULL;
 575 }
 576
 577 struct nft_module_request {
 578         struct list_head        list;
 579         char                    module[MODULE_NAME_LEN];
 580         bool                    done;
 581 };
 582
 583 #ifdef CONFIG_MODULES
 584 static int nft_request_module(struct net *net, const char *fmt, ...)
 585 {
 586         char module_name[MODULE_NAME_LEN];
 587         struct nft_module_request *req;
 588         va_list args;
 589         int ret;
 590
 591         va_start(args, fmt);
 592         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 593         va_end(args);
 594         if (ret >= MODULE_NAME_LEN)
 595                 return 0;
 596
 597         list_for_each_entry(req, &net->nft.module_list, list) {
 598                 if (!strcmp(req->module, module_name)) {
 599                         if (req->done)
 600                                 return 0;
 601
 602                         /* A request to load this module already exists. */
 603                         return -EAGAIN;
 604                 }
 605         }
 606
 607         req = kmalloc(sizeof(*req), GFP_KERNEL);
 608         if (!req)
 609                 return -ENOMEM;
 610
 611         req->done = false;
 612         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 613         list_add_tail(&req->list, &net->nft.module_list);
 614
 615         return -EAGAIN;
 616 }
 617 #endif
 618
 619 static void lockdep_nfnl_nft_mutex_not_held(void)
 620 {
 621 #ifdef CONFIG_PROVE_LOCKING
 622         WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 623 #endif
 624 }
 625
 626 static const struct nft_chain_type *
 627 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 628                             u8 family, bool autoload)
 629 {
 630         const struct nft_chain_type *type;
 631
 632         type = __nf_tables_chain_type_lookup(nla, family);
 633         if (type != NULL)
 634                 return type;
 635
 636         lockdep_nfnl_nft_mutex_not_held();
 637 #ifdef CONFIG_MODULES
 638         if (autoload) {
 639                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 640                                        nla_len(nla),
 641                                        (const char *)nla_data(nla)) == -EAGAIN)
 642                         return ERR_PTR(-EAGAIN);
 643         }
 644 #endif
 645         return ERR_PTR(-ENOENT);
 646 }
 647
 648 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 649         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 650                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 651         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 652         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 653 };
 654
 655 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 656                                      u32 portid, u32 seq, int event, u32 flags,
 657                                      int family, const struct nft_table *table)
 658 {
 659         struct nlmsghdr *nlh;
 660         struct nfgenmsg *nfmsg;
 661
 662         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 663         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 664         if (nlh == NULL)
 665                 goto nla_put_failure;
 666
 667         nfmsg = nlmsg_data(nlh);
 668         nfmsg->nfgen_family     = family;
 669         nfmsg->version          = NFNETLINK_V0;
 670         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 671
 672         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 673             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 674             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 675             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 676                          NFTA_TABLE_PAD))
 677                 goto nla_put_failure;
 678
 679         nlmsg_end(skb, nlh);
 680         return 0;
 681
 682 nla_put_failure:
 683         nlmsg_trim(skb, nlh);
 684         return -1;
 685 }
 686
 687 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 688 {
 689         struct sk_buff *skb;
 690         int err;
 691         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 692                               ctx->table->name, ctx->table->handle);
 693
 694         audit_log_nfcfg(buf,
 695                         ctx->family,
 696                         ctx->table->use,
 697                         event == NFT_MSG_NEWTABLE ?
 698                                 AUDIT_NFT_OP_TABLE_REGISTER :
 699                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 700                         GFP_KERNEL);
 701         kfree(buf);
 702
 703         if (!ctx->report &&
 704             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 705                 return;
 706
 707         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 708         if (skb == NULL)
 709                 goto err;
 710
 711         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 712                                         event, 0, ctx->family, ctx->table);
 713         if (err < 0) {
 714                 kfree_skb(skb);
 715                 goto err;
 716         }
 717
 718         nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
 719                        ctx->report, GFP_KERNEL);
 720         return;
 721 err:
 722         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 723 }
 724
 725 static int nf_tables_dump_tables(struct sk_buff *skb,
 726                                  struct netlink_callback *cb)
 727 {
 728         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 729         const struct nft_table *table;
 730         unsigned int idx = 0, s_idx = cb->args[0];
 731         struct net *net = sock_net(skb->sk);
 732         int family = nfmsg->nfgen_family;
 733
 734         rcu_read_lock();
 735         cb->seq = net->nft.base_seq;
 736
 737         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 738                 if (family != NFPROTO_UNSPEC && family != table->family)
 739                         continue;
 740
 741                 if (idx < s_idx)
 742                         goto cont;
 743                 if (idx > s_idx)
 744                         memset(&cb->args[1], 0,
 745                                sizeof(cb->args) - sizeof(cb->args[0]));
 746                 if (!nft_is_active(net, table))
 747                         continue;
 748                 if (nf_tables_fill_table_info(skb, net,
 749                                               NETLINK_CB(cb->skb).portid,
 750                                               cb->nlh->nlmsg_seq,
 751                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 752                                               table->family, table) < 0)
 753                         goto done;
 754
 755                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 756 cont:
 757                 idx++;
 758         }
 759 done:
 760         rcu_read_unlock();
 761         cb->args[0] = idx;
 762         return skb->len;
 763 }
 764
 765 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 766                                       const struct nlmsghdr *nlh,
 767                                       struct netlink_dump_control *c)
 768 {
 769         int err;
 770
 771         if (!try_module_get(THIS_MODULE))
 772                 return -EINVAL;
 773
 774         rcu_read_unlock();
 775         err = netlink_dump_start(nlsk, skb, nlh, c);
 776         rcu_read_lock();
 777         module_put(THIS_MODULE);
 778
 779         return err;
 780 }
 781
 782 /* called with rcu_read_lock held */
 783 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 784                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 785                               const struct nlattr * const nla[],
 786                               struct netlink_ext_ack *extack)
 787 {
 788         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 789         u8 genmask = nft_genmask_cur(net);
 790         const struct nft_table *table;
 791         struct sk_buff *skb2;
 792         int family = nfmsg->nfgen_family;
 793         int err;
 794
 795         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 796                 struct netlink_dump_control c = {
 797                         .dump = nf_tables_dump_tables,
 798                         .module = THIS_MODULE,
 799                 };
 800
 801                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 802         }
 803
 804         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
 805         if (IS_ERR(table)) {
 806                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 807                 return PTR_ERR(table);
 808         }
 809
 810         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 811         if (!skb2)
 812                 return -ENOMEM;
 813
 814         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 815                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 816                                         family, table);
 817         if (err < 0)
 818                 goto err_fill_table_info;
 819
 820         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 821
 822 err_fill_table_info:
 823         kfree_skb(skb2);
 824         return err;
 825 }
 826
 827 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 828 {
 829         struct nft_chain *chain;
 830         u32 i = 0;
 831
 832         list_for_each_entry(chain, &table->chains, list) {
 833                 if (!nft_is_active_next(net, chain))
 834                         continue;
 835                 if (!nft_is_base_chain(chain))
 836                         continue;
 837
 838                 if (cnt && i++ == cnt)
 839                         break;
 840
 841                 nf_tables_unregister_hook(net, table, chain);
 842         }
 843 }
 844
 845 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 846 {
 847         struct nft_chain *chain;
 848         int err, i = 0;
 849
 850         list_for_each_entry(chain, &table->chains, list) {
 851                 if (!nft_is_active_next(net, chain))
 852                         continue;
 853                 if (!nft_is_base_chain(chain))
 854                         continue;
 855
 856                 err = nf_tables_register_hook(net, table, chain);
 857                 if (err < 0)
 858                         goto err_register_hooks;
 859
 860                 i++;
 861         }
 862         return 0;
 863
 864 err_register_hooks:
 865         if (i)
 866                 nft_table_disable(net, table, i);
 867         return err;
 868 }
 869
 870 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 871 {
 872         nft_table_disable(net, table, 0);
 873 }
 874
 875 static int nf_tables_updtable(struct nft_ctx *ctx)
 876 {
 877         struct nft_trans *trans;
 878         u32 flags;
 879         int ret = 0;
 880
 881         if (!ctx->nla[NFTA_TABLE_FLAGS])
 882                 return 0;
 883
 884         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 885         if (flags & ~NFT_TABLE_F_DORMANT)
 886                 return -EINVAL;
 887
 888         if (flags == ctx->table->flags)
 889                 return 0;
 890
 891         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 892                                 sizeof(struct nft_trans_table));
 893         if (trans == NULL)
 894                 return -ENOMEM;
 895
 896         if ((flags & NFT_TABLE_F_DORMANT) &&
 897             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 898                 nft_trans_table_enable(trans) = false;
 899         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 900                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 901                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 902                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 903                 if (ret >= 0)
 904                         nft_trans_table_enable(trans) = true;
 905                 else
 906                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 907         }
 908         if (ret < 0)
 909                 goto err;
 910
 911         nft_trans_table_update(trans) = true;
 912         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 913         return 0;
 914 err:
 915         nft_trans_destroy(trans);
 916         return ret;
 917 }
 918
 919 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 920 {
 921         const char *name = data;
 922
 923         return jhash(name, strlen(name), seed);
 924 }
 925
 926 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 927 {
 928         const struct nft_chain *chain = data;
 929
 930         return nft_chain_hash(chain->name, 0, seed);
 931 }
 932
 933 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 934                               const void *ptr)
 935 {
 936         const struct nft_chain *chain = ptr;
 937         const char *name = arg->key;
 938
 939         return strcmp(chain->name, name);
 940 }
 941
 942 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 943 {
 944         const struct nft_object_hash_key *k = data;
 945
 946         seed ^= hash_ptr(k->table, 32);
 947
 948         return jhash(k->name, strlen(k->name), seed);
 949 }
 950
 951 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 952 {
 953         const struct nft_object *obj = data;
 954
 955         return nft_objname_hash(&obj->key, 0, seed);
 956 }
 957
 958 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 959                                 const void *ptr)
 960 {
 961         const struct nft_object_hash_key *k = arg->key;
 962         const struct nft_object *obj = ptr;
 963
 964         if (obj->key.table != k->table)
 965                 return -1;
 966
 967         return strcmp(obj->key.name, k->name);
 968 }
 969
 970 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
 971                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 972                               const struct nlattr * const nla[],
 973                               struct netlink_ext_ack *extack)
 974 {
 975         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 976         u8 genmask = nft_genmask_next(net);
 977         int family = nfmsg->nfgen_family;
 978         const struct nlattr *attr;
 979         struct nft_table *table;
 980         u32 flags = 0;
 981         struct nft_ctx ctx;
 982         int err;
 983
 984         lockdep_assert_held(&net->nft.commit_mutex);
 985         attr = nla[NFTA_TABLE_NAME];
 986         table = nft_table_lookup(net, attr, family, genmask);
 987         if (IS_ERR(table)) {
 988                 if (PTR_ERR(table) != -ENOENT)
 989                         return PTR_ERR(table);
 990         } else {
 991                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
 992                         NL_SET_BAD_ATTR(extack, attr);
 993                         return -EEXIST;
 994                 }
 995                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
 996                         return -EOPNOTSUPP;
 997
 998                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
 999                 return nf_tables_updtable(&ctx);
1000         }
1001
1002         if (nla[NFTA_TABLE_FLAGS]) {
1003                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1004                 if (flags & ~NFT_TABLE_F_DORMANT)
1005                         return -EINVAL;
1006         }
1007
1008         err = -ENOMEM;
1009         table = kzalloc(sizeof(*table), GFP_KERNEL);
1010         if (table == NULL)
1011                 goto err_kzalloc;
1012
1013         table->name = nla_strdup(attr, GFP_KERNEL);
1014         if (table->name == NULL)
1015                 goto err_strdup;
1016
1017         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1018         if (err)
1019                 goto err_chain_ht;
1020
1021         INIT_LIST_HEAD(&table->chains);
1022         INIT_LIST_HEAD(&table->sets);
1023         INIT_LIST_HEAD(&table->objects);
1024         INIT_LIST_HEAD(&table->flowtables);
1025         table->family = family;
1026         table->flags = flags;
1027         table->handle = ++table_handle;
1028
1029         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1030         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1031         if (err < 0)
1032                 goto err_trans;
1033
1034         list_add_tail_rcu(&table->list, &net->nft.tables);
1035         return 0;
1036 err_trans:
1037         rhltable_destroy(&table->chains_ht);
1038 err_chain_ht:
1039         kfree(table->name);
1040 err_strdup:
1041         kfree(table);
1042 err_kzalloc:
1043         return err;
1044 }
1045
1046 static int nft_flush_table(struct nft_ctx *ctx)
1047 {
1048         struct nft_flowtable *flowtable, *nft;
1049         struct nft_chain *chain, *nc;
1050         struct nft_object *obj, *ne;
1051         struct nft_set *set, *ns;
1052         int err;
1053
1054         list_for_each_entry(chain, &ctx->table->chains, list) {
1055                 if (!nft_is_active_next(ctx->net, chain))
1056                         continue;
1057
1058                 if (nft_chain_is_bound(chain))
1059                         continue;
1060
1061                 ctx->chain = chain;
1062
1063                 err = nft_delrule_by_chain(ctx);
1064                 if (err < 0)
1065                         goto out;
1066         }
1067
1068         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1069                 if (!nft_is_active_next(ctx->net, set))
1070                         continue;
1071
1072                 if (nft_set_is_anonymous(set) &&
1073                     !list_empty(&set->bindings))
1074                         continue;
1075
1076                 err = nft_delset(ctx, set);
1077                 if (err < 0)
1078                         goto out;
1079         }
1080
1081         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1082                 if (!nft_is_active_next(ctx->net, flowtable))
1083                         continue;
1084
1085                 err = nft_delflowtable(ctx, flowtable);
1086                 if (err < 0)
1087                         goto out;
1088         }
1089
1090         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1091                 if (!nft_is_active_next(ctx->net, obj))
1092                         continue;
1093
1094                 err = nft_delobj(ctx, obj);
1095                 if (err < 0)
1096                         goto out;
1097         }
1098
1099         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1100                 if (!nft_is_active_next(ctx->net, chain))
1101                         continue;
1102
1103                 if (nft_chain_is_bound(chain))
1104                         continue;
1105
1106                 ctx->chain = chain;
1107
1108                 err = nft_delchain(ctx);
1109                 if (err < 0)
1110                         goto out;
1111         }
1112
1113         err = nft_deltable(ctx);
1114 out:
1115         return err;
1116 }
1117
1118 static int nft_flush(struct nft_ctx *ctx, int family)
1119 {
1120         struct nft_table *table, *nt;
1121         const struct nlattr * const *nla = ctx->nla;
1122         int err = 0;
1123
1124         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1125                 if (family != AF_UNSPEC && table->family != family)
1126                         continue;
1127
1128                 ctx->family = table->family;
1129
1130                 if (!nft_is_active_next(ctx->net, table))
1131                         continue;
1132
1133                 if (nla[NFTA_TABLE_NAME] &&
1134                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1135                         continue;
1136
1137                 ctx->table = table;
1138
1139                 err = nft_flush_table(ctx);
1140                 if (err < 0)
1141                         goto out;
1142         }
1143 out:
1144         return err;
1145 }
1146
1147 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1148                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1149                               const struct nlattr * const nla[],
1150                               struct netlink_ext_ack *extack)
1151 {
1152         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1153         u8 genmask = nft_genmask_next(net);
1154         int family = nfmsg->nfgen_family;
1155         const struct nlattr *attr;
1156         struct nft_table *table;
1157         struct nft_ctx ctx;
1158
1159         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1160         if (family == AF_UNSPEC ||
1161             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1162                 return nft_flush(&ctx, family);
1163
1164         if (nla[NFTA_TABLE_HANDLE]) {
1165                 attr = nla[NFTA_TABLE_HANDLE];
1166                 table = nft_table_lookup_byhandle(net, attr, genmask);
1167         } else {
1168                 attr = nla[NFTA_TABLE_NAME];
1169                 table = nft_table_lookup(net, attr, family, genmask);
1170         }
1171
1172         if (IS_ERR(table)) {
1173                 NL_SET_BAD_ATTR(extack, attr);
1174                 return PTR_ERR(table);
1175         }
1176
1177         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1178             table->use > 0)
1179                 return -EBUSY;
1180
1181         ctx.family = family;
1182         ctx.table = table;
1183
1184         return nft_flush_table(&ctx);
1185 }
1186
1187 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1188 {
1189         if (WARN_ON(ctx->table->use > 0))
1190                 return;
1191
1192         rhltable_destroy(&ctx->table->chains_ht);
1193         kfree(ctx->table->name);
1194         kfree(ctx->table);
1195 }
1196
1197 void nft_register_chain_type(const struct nft_chain_type *ctype)
1198 {
1199         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1200         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1201                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1202                 return;
1203         }
1204         chain_type[ctype->family][ctype->type] = ctype;
1205         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1206 }
1207 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1208
1209 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1210 {
1211         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1212         chain_type[ctype->family][ctype->type] = NULL;
1213         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1214 }
1215 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1216
1217 /*
1218  * Chains
1219  */
1220
1221 static struct nft_chain *
1222 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1223 {
1224         struct nft_chain *chain;
1225
1226         list_for_each_entry(chain, &table->chains, list) {
1227                 if (chain->handle == handle &&
1228                     nft_active_genmask(chain, genmask))
1229                         return chain;
1230         }
1231
1232         return ERR_PTR(-ENOENT);
1233 }
1234
1235 static bool lockdep_commit_lock_is_held(const struct net *net)
1236 {
1237 #ifdef CONFIG_PROVE_LOCKING
1238         return lockdep_is_held(&net->nft.commit_mutex);
1239 #else
1240         return true;
1241 #endif
1242 }
1243
1244 static struct nft_chain *nft_chain_lookup(struct net *net,
1245                                           struct nft_table *table,
1246                                           const struct nlattr *nla, u8 genmask)
1247 {
1248         char search[NFT_CHAIN_MAXNAMELEN + 1];
1249         struct rhlist_head *tmp, *list;
1250         struct nft_chain *chain;
1251
1252         if (nla == NULL)
1253                 return ERR_PTR(-EINVAL);
1254
1255         nla_strlcpy(search, nla, sizeof(search));
1256
1257         WARN_ON(!rcu_read_lock_held() &&
1258                 !lockdep_commit_lock_is_held(net));
1259
1260         chain = ERR_PTR(-ENOENT);
1261         rcu_read_lock();
1262         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1263         if (!list)
1264                 goto out_unlock;
1265
1266         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1267                 if (nft_active_genmask(chain, genmask))
1268                         goto out_unlock;
1269         }
1270         chain = ERR_PTR(-ENOENT);
1271 out_unlock:
1272         rcu_read_unlock();
1273         return chain;
1274 }
1275
1276 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1277         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1278                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1279         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1280         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1281                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1282         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1283         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1284         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1285                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1286         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1287         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1288         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1289 };
1290
1291 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1292         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1293         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1294         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1295                                     .len = IFNAMSIZ - 1 },
1296 };
1297
1298 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1299 {
1300         struct nft_stats *cpu_stats, total;
1301         struct nlattr *nest;
1302         unsigned int seq;
1303         u64 pkts, bytes;
1304         int cpu;
1305
1306         if (!stats)
1307                 return 0;
1308
1309         memset(&total, 0, sizeof(total));
1310         for_each_possible_cpu(cpu) {
1311                 cpu_stats = per_cpu_ptr(stats, cpu);
1312                 do {
1313                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1314                         pkts = cpu_stats->pkts;
1315                         bytes = cpu_stats->bytes;
1316                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1317                 total.pkts += pkts;
1318                 total.bytes += bytes;
1319         }
1320         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1321         if (nest == NULL)
1322                 goto nla_put_failure;
1323
1324         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1325                          NFTA_COUNTER_PAD) ||
1326             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1327                          NFTA_COUNTER_PAD))
1328                 goto nla_put_failure;
1329
1330         nla_nest_end(skb, nest);
1331         return 0;
1332
1333 nla_put_failure:
1334         return -ENOSPC;
1335 }
1336
1337 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1338                                    const struct nft_base_chain *basechain)
1339 {
1340         const struct nf_hook_ops *ops = &basechain->ops;
1341         struct nft_hook *hook, *first = NULL;
1342         struct nlattr *nest, *nest_devs;
1343         int n = 0;
1344
1345         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1346         if (nest == NULL)
1347                 goto nla_put_failure;
1348         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1349                 goto nla_put_failure;
1350         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1351                 goto nla_put_failure;
1352
1353         if (family == NFPROTO_NETDEV) {
1354                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1355                 list_for_each_entry(hook, &basechain->hook_list, list) {
1356                         if (!first)
1357                                 first = hook;
1358
1359                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1360                                            hook->ops.dev->name))
1361                                 goto nla_put_failure;
1362                         n++;
1363                 }
1364                 nla_nest_end(skb, nest_devs);
1365
1366                 if (n == 1 &&
1367                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1368                         goto nla_put_failure;
1369         }
1370         nla_nest_end(skb, nest);
1371
1372         return 0;
1373 nla_put_failure:
1374         return -1;
1375 }
1376
1377 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1378                                      u32 portid, u32 seq, int event, u32 flags,
1379                                      int family, const struct nft_table *table,
1380                                      const struct nft_chain *chain)
1381 {
1382         struct nlmsghdr *nlh;
1383         struct nfgenmsg *nfmsg;
1384
1385         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1386         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1387         if (nlh == NULL)
1388                 goto nla_put_failure;
1389
1390         nfmsg = nlmsg_data(nlh);
1391         nfmsg->nfgen_family     = family;
1392         nfmsg->version          = NFNETLINK_V0;
1393         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1394
1395         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1396                 goto nla_put_failure;
1397         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1398                          NFTA_CHAIN_PAD))
1399                 goto nla_put_failure;
1400         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1401                 goto nla_put_failure;
1402
1403         if (nft_is_base_chain(chain)) {
1404                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1405                 struct nft_stats __percpu *stats;
1406
1407                 if (nft_dump_basechain_hook(skb, family, basechain))
1408                         goto nla_put_failure;
1409
1410                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1411                                  htonl(basechain->policy)))
1412                         goto nla_put_failure;
1413
1414                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1415                         goto nla_put_failure;
1416
1417                 stats = rcu_dereference_check(basechain->stats,
1418                                               lockdep_commit_lock_is_held(net));
1419                 if (nft_dump_stats(skb, stats))
1420                         goto nla_put_failure;
1421         }
1422
1423         if (chain->flags &&
1424             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1425                 goto nla_put_failure;
1426
1427         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1428                 goto nla_put_failure;
1429
1430         nlmsg_end(skb, nlh);
1431         return 0;
1432
1433 nla_put_failure:
1434         nlmsg_trim(skb, nlh);
1435         return -1;
1436 }
1437
1438 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1439 {
1440         struct sk_buff *skb;
1441         int err;
1442         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1443                               ctx->table->name, ctx->table->handle,
1444                               ctx->chain->name, ctx->chain->handle);
1445
1446         audit_log_nfcfg(buf,
1447                         ctx->family,
1448                         ctx->chain->use,
1449                         event == NFT_MSG_NEWCHAIN ?
1450                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1451                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1452                         GFP_KERNEL);
1453         kfree(buf);
1454
1455         if (!ctx->report &&
1456             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1457                 return;
1458
1459         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1460         if (skb == NULL)
1461                 goto err;
1462
1463         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1464                                         event, 0, ctx->family, ctx->table,
1465                                         ctx->chain);
1466         if (err < 0) {
1467                 kfree_skb(skb);
1468                 goto err;
1469         }
1470
1471         nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
1472                        ctx->report, GFP_KERNEL);
1473         return;
1474 err:
1475         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1476 }
1477
1478 static int nf_tables_dump_chains(struct sk_buff *skb,
1479                                  struct netlink_callback *cb)
1480 {
1481         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1482         const struct nft_table *table;
1483         const struct nft_chain *chain;
1484         unsigned int idx = 0, s_idx = cb->args[0];
1485         struct net *net = sock_net(skb->sk);
1486         int family = nfmsg->nfgen_family;
1487
1488         rcu_read_lock();
1489         cb->seq = net->nft.base_seq;
1490
1491         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1492                 if (family != NFPROTO_UNSPEC && family != table->family)
1493                         continue;
1494
1495                 list_for_each_entry_rcu(chain, &table->chains, list) {
1496                         if (idx < s_idx)
1497                                 goto cont;
1498                         if (idx > s_idx)
1499                                 memset(&cb->args[1], 0,
1500                                        sizeof(cb->args) - sizeof(cb->args[0]));
1501                         if (!nft_is_active(net, chain))
1502                                 continue;
1503                         if (nf_tables_fill_chain_info(skb, net,
1504                                                       NETLINK_CB(cb->skb).portid,
1505                                                       cb->nlh->nlmsg_seq,
1506                                                       NFT_MSG_NEWCHAIN,
1507                                                       NLM_F_MULTI,
1508                                                       table->family, table,
1509                                                       chain) < 0)
1510                                 goto done;
1511
1512                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1513 cont:
1514                         idx++;
1515                 }
1516         }
1517 done:
1518         rcu_read_unlock();
1519         cb->args[0] = idx;
1520         return skb->len;
1521 }
1522
1523 /* called with rcu_read_lock held */
1524 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1525                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1526                               const struct nlattr * const nla[],
1527                               struct netlink_ext_ack *extack)
1528 {
1529         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1530         u8 genmask = nft_genmask_cur(net);
1531         const struct nft_chain *chain;
1532         struct nft_table *table;
1533         struct sk_buff *skb2;
1534         int family = nfmsg->nfgen_family;
1535         int err;
1536
1537         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1538                 struct netlink_dump_control c = {
1539                         .dump = nf_tables_dump_chains,
1540                         .module = THIS_MODULE,
1541                 };
1542
1543                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1544         }
1545
1546         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1547         if (IS_ERR(table)) {
1548                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1549                 return PTR_ERR(table);
1550         }
1551
1552         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1553         if (IS_ERR(chain)) {
1554                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1555                 return PTR_ERR(chain);
1556         }
1557
1558         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1559         if (!skb2)
1560                 return -ENOMEM;
1561
1562         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1563                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1564                                         family, table, chain);
1565         if (err < 0)
1566                 goto err_fill_chain_info;
1567
1568         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1569
1570 err_fill_chain_info:
1571         kfree_skb(skb2);
1572         return err;
1573 }
1574
1575 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1576         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1577         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1578 };
1579
1580 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1581 {
1582         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1583         struct nft_stats __percpu *newstats;
1584         struct nft_stats *stats;
1585         int err;
1586
1587         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1588                                           nft_counter_policy, NULL);
1589         if (err < 0)
1590                 return ERR_PTR(err);
1591
1592         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1593                 return ERR_PTR(-EINVAL);
1594
1595         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1596         if (newstats == NULL)
1597                 return ERR_PTR(-ENOMEM);
1598
1599         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1600          * are not exposed to userspace.
1601          */
1602         preempt_disable();
1603         stats = this_cpu_ptr(newstats);
1604         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1605         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1606         preempt_enable();
1607
1608         return newstats;
1609 }
1610
1611 static void nft_chain_stats_replace(struct nft_trans *trans)
1612 {
1613         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1614
1615         if (!nft_trans_chain_stats(trans))
1616                 return;
1617
1618         nft_trans_chain_stats(trans) =
1619                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1620                                     lockdep_commit_lock_is_held(trans->ctx.net));
1621
1622         if (!nft_trans_chain_stats(trans))
1623                 static_branch_inc(&nft_counters_enabled);
1624 }
1625
1626 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1627 {
1628         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1629         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1630
1631         if (g0 != g1)
1632                 kvfree(g1);
1633         kvfree(g0);
1634
1635         /* should be NULL either via abort or via successful commit */
1636         WARN_ON_ONCE(chain->rules_next);
1637         kvfree(chain->rules_next);
1638 }
1639
1640 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1641 {
1642         struct nft_chain *chain = ctx->chain;
1643         struct nft_hook *hook, *next;
1644
1645         if (WARN_ON(chain->use > 0))
1646                 return;
1647
1648         /* no concurrent access possible anymore */
1649         nf_tables_chain_free_chain_rules(chain);
1650
1651         if (nft_is_base_chain(chain)) {
1652                 struct nft_base_chain *basechain = nft_base_chain(chain);
1653
1654                 if (ctx->family == NFPROTO_NETDEV) {
1655                         list_for_each_entry_safe(hook, next,
1656                                                  &basechain->hook_list, list) {
1657                                 list_del_rcu(&hook->list);
1658                                 kfree_rcu(hook, rcu);
1659                         }
1660                 }
1661                 module_put(basechain->type->owner);
1662                 if (rcu_access_pointer(basechain->stats)) {
1663                         static_branch_dec(&nft_counters_enabled);
1664                         free_percpu(rcu_dereference_raw(basechain->stats));
1665                 }
1666                 kfree(chain->name);
1667                 kfree(basechain);
1668         } else {
1669                 kfree(chain->name);
1670                 kfree(chain);
1671         }
1672 }
1673
1674 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1675                                               const struct nlattr *attr)
1676 {
1677         struct net_device *dev;
1678         char ifname[IFNAMSIZ];
1679         struct nft_hook *hook;
1680         int err;
1681
1682         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1683         if (!hook) {
1684                 err = -ENOMEM;
1685                 goto err_hook_alloc;
1686         }
1687
1688         nla_strlcpy(ifname, attr, IFNAMSIZ);
1689         dev = __dev_get_by_name(net, ifname);
1690         if (!dev) {
1691                 err = -ENOENT;
1692                 goto err_hook_dev;
1693         }
1694         hook->ops.dev = dev;
1695         hook->inactive = false;
1696
1697         return hook;
1698
1699 err_hook_dev:
1700         kfree(hook);
1701 err_hook_alloc:
1702         return ERR_PTR(err);
1703 }
1704
1705 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1706                                            const struct nft_hook *this)
1707 {
1708         struct nft_hook *hook;
1709
1710         list_for_each_entry(hook, hook_list, list) {
1711                 if (this->ops.dev == hook->ops.dev)
1712                         return hook;
1713         }
1714
1715         return NULL;
1716 }
1717
1718 static int nf_tables_parse_netdev_hooks(struct net *net,
1719                                         const struct nlattr *attr,
1720                                         struct list_head *hook_list)
1721 {
1722         struct nft_hook *hook, *next;
1723         const struct nlattr *tmp;
1724         int rem, n = 0, err;
1725
1726         nla_for_each_nested(tmp, attr, rem) {
1727                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1728                         err = -EINVAL;
1729                         goto err_hook;
1730                 }
1731
1732                 hook = nft_netdev_hook_alloc(net, tmp);
1733                 if (IS_ERR(hook)) {
1734                         err = PTR_ERR(hook);
1735                         goto err_hook;
1736                 }
1737                 if (nft_hook_list_find(hook_list, hook)) {
1738                         kfree(hook);
1739                         err = -EEXIST;
1740                         goto err_hook;
1741                 }
1742                 list_add_tail(&hook->list, hook_list);
1743                 n++;
1744
1745                 if (n == NFT_NETDEVICE_MAX) {
1746                         err = -EFBIG;
1747                         goto err_hook;
1748                 }
1749         }
1750
1751         return 0;
1752
1753 err_hook:
1754         list_for_each_entry_safe(hook, next, hook_list, list) {
1755                 list_del(&hook->list);
1756                 kfree(hook);
1757         }
1758         return err;
1759 }
1760
1761 struct nft_chain_hook {
1762         u32                             num;
1763         s32                             priority;
1764         const struct nft_chain_type     *type;
1765         struct list_head                list;
1766 };
1767
1768 static int nft_chain_parse_netdev(struct net *net,
1769                                   struct nlattr *tb[],
1770                                   struct list_head *hook_list)
1771 {
1772         struct nft_hook *hook;
1773         int err;
1774
1775         if (tb[NFTA_HOOK_DEV]) {
1776                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1777                 if (IS_ERR(hook))
1778                         return PTR_ERR(hook);
1779
1780                 list_add_tail(&hook->list, hook_list);
1781         } else if (tb[NFTA_HOOK_DEVS]) {
1782                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1783                                                    hook_list);
1784                 if (err < 0)
1785                         return err;
1786
1787                 if (list_empty(hook_list))
1788                         return -EINVAL;
1789         } else {
1790                 return -EINVAL;
1791         }
1792
1793         return 0;
1794 }
1795
1796 static int nft_chain_parse_hook(struct net *net,
1797                                 const struct nlattr * const nla[],
1798                                 struct nft_chain_hook *hook, u8 family,
1799                                 bool autoload)
1800 {
1801         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1802         const struct nft_chain_type *type;
1803         int err;
1804
1805         lockdep_assert_held(&net->nft.commit_mutex);
1806         lockdep_nfnl_nft_mutex_not_held();
1807
1808         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1809                                           nla[NFTA_CHAIN_HOOK],
1810                                           nft_hook_policy, NULL);
1811         if (err < 0)
1812                 return err;
1813
1814         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1815             ha[NFTA_HOOK_PRIORITY] == NULL)
1816                 return -EINVAL;
1817
1818         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1819         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1820
1821         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1822         if (!type)
1823                 return -EOPNOTSUPP;
1824
1825         if (nla[NFTA_CHAIN_TYPE]) {
1826                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1827                                                    family, autoload);
1828                 if (IS_ERR(type))
1829                         return PTR_ERR(type);
1830         }
1831         if (hook->num > NF_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1832                 return -EOPNOTSUPP;
1833
1834         if (type->type == NFT_CHAIN_T_NAT &&
1835             hook->priority <= NF_IP_PRI_CONNTRACK)
1836                 return -EOPNOTSUPP;
1837
1838         if (!try_module_get(type->owner))
1839                 return -ENOENT;
1840
1841         hook->type = type;
1842
1843         INIT_LIST_HEAD(&hook->list);
1844         if (family == NFPROTO_NETDEV) {
1845                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1846                 if (err < 0) {
1847                         module_put(type->owner);
1848                         return err;
1849                 }
1850         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1851                 module_put(type->owner);
1852                 return -EOPNOTSUPP;
1853         }
1854
1855         return 0;
1856 }
1857
1858 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1859 {
1860         struct nft_hook *h, *next;
1861
1862         list_for_each_entry_safe(h, next, &hook->list, list) {
1863                 list_del(&h->list);
1864                 kfree(h);
1865         }
1866         module_put(hook->type->owner);
1867 }
1868
1869 struct nft_rules_old {
1870         struct rcu_head h;
1871         struct nft_rule **start;
1872 };
1873
1874 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1875                                                      unsigned int alloc)
1876 {
1877         if (alloc > INT_MAX)
1878                 return NULL;
1879
1880         alloc += 1;     /* NULL, ends rules */
1881         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1882                 return NULL;
1883
1884         alloc *= sizeof(struct nft_rule *);
1885         alloc += sizeof(struct nft_rules_old);
1886
1887         return kvmalloc(alloc, GFP_KERNEL);
1888 }
1889
1890 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1891                                     const struct nft_chain_hook *hook,
1892                                     struct nft_chain *chain)
1893 {
1894         ops->pf         = family;
1895         ops->hooknum    = hook->num;
1896         ops->priority   = hook->priority;
1897         ops->priv       = chain;
1898         ops->hook       = hook->type->hooks[ops->hooknum];
1899 }
1900
1901 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1902                               struct nft_chain_hook *hook, u32 flags)
1903 {
1904         struct nft_chain *chain;
1905         struct nft_hook *h;
1906
1907         basechain->type = hook->type;
1908         INIT_LIST_HEAD(&basechain->hook_list);
1909         chain = &basechain->chain;
1910
1911         if (family == NFPROTO_NETDEV) {
1912                 list_splice_init(&hook->list, &basechain->hook_list);
1913                 list_for_each_entry(h, &basechain->hook_list, list)
1914                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1915
1916                 basechain->ops.hooknum  = hook->num;
1917                 basechain->ops.priority = hook->priority;
1918         } else {
1919                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1920         }
1921
1922         chain->flags |= NFT_CHAIN_BASE | flags;
1923         basechain->policy = NF_ACCEPT;
1924         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1925             nft_chain_offload_priority(basechain) < 0)
1926                 return -EOPNOTSUPP;
1927
1928         flow_block_init(&basechain->flow_block);
1929
1930         return 0;
1931 }
1932
1933 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1934 {
1935         int err;
1936
1937         err = rhltable_insert_key(&table->chains_ht, chain->name,
1938                                   &chain->rhlhead, nft_chain_ht_params);
1939         if (err)
1940                 return err;
1941
1942         list_add_tail_rcu(&chain->list, &table->chains);
1943
1944         return 0;
1945 }
1946
1947 static u64 chain_id;
1948
1949 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1950                               u8 policy, u32 flags)
1951 {
1952         const struct nlattr * const *nla = ctx->nla;
1953         struct nft_table *table = ctx->table;
1954         struct nft_base_chain *basechain;
1955         struct nft_stats __percpu *stats;
1956         struct net *net = ctx->net;
1957         char name[NFT_NAME_MAXLEN];
1958         struct nft_trans *trans;
1959         struct nft_chain *chain;
1960         struct nft_rule **rules;
1961         int err;
1962
1963         if (table->use == UINT_MAX)
1964                 return -EOVERFLOW;
1965
1966         if (nla[NFTA_CHAIN_HOOK]) {
1967                 struct nft_chain_hook hook;
1968
1969                 if (flags & NFT_CHAIN_BINDING)
1970                         return -EOPNOTSUPP;
1971
1972                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
1973                 if (err < 0)
1974                         return err;
1975
1976                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
1977                 if (basechain == NULL) {
1978                         nft_chain_release_hook(&hook);
1979                         return -ENOMEM;
1980                 }
1981                 chain = &basechain->chain;
1982
1983                 if (nla[NFTA_CHAIN_COUNTERS]) {
1984                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
1985                         if (IS_ERR(stats)) {
1986                                 nft_chain_release_hook(&hook);
1987                                 kfree(basechain);
1988                                 return PTR_ERR(stats);
1989                         }
1990                         rcu_assign_pointer(basechain->stats, stats);
1991                         static_branch_inc(&nft_counters_enabled);
1992                 }
1993
1994                 err = nft_basechain_init(basechain, family, &hook, flags);
1995                 if (err < 0) {
1996                         nft_chain_release_hook(&hook);
1997                         kfree(basechain);
1998                         return err;
1999                 }
2000         } else {
2001                 if (flags & NFT_CHAIN_BASE)
2002                         return -EINVAL;
2003                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2004                         return -EOPNOTSUPP;
2005
2006                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2007                 if (chain == NULL)
2008                         return -ENOMEM;
2009
2010                 chain->flags = flags;
2011         }
2012         ctx->chain = chain;
2013
2014         INIT_LIST_HEAD(&chain->rules);
2015         chain->handle = nf_tables_alloc_handle(table);
2016         chain->table = table;
2017
2018         if (nla[NFTA_CHAIN_NAME]) {
2019                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2020         } else {
2021                 if (!(flags & NFT_CHAIN_BINDING)) {
2022                         err = -EINVAL;
2023                         goto err1;
2024                 }
2025
2026                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2027                 chain->name = kstrdup(name, GFP_KERNEL);
2028         }
2029
2030         if (!chain->name) {
2031                 err = -ENOMEM;
2032                 goto err1;
2033         }
2034
2035         rules = nf_tables_chain_alloc_rules(chain, 0);
2036         if (!rules) {
2037                 err = -ENOMEM;
2038                 goto err1;
2039         }
2040
2041         *rules = NULL;
2042         rcu_assign_pointer(chain->rules_gen_0, rules);
2043         rcu_assign_pointer(chain->rules_gen_1, rules);
2044
2045         err = nf_tables_register_hook(net, table, chain);
2046         if (err < 0)
2047                 goto err1;
2048
2049         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2050         if (IS_ERR(trans)) {
2051                 err = PTR_ERR(trans);
2052                 goto err2;
2053         }
2054
2055         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2056         if (nft_is_base_chain(chain))
2057                 nft_trans_chain_policy(trans) = policy;
2058
2059         err = nft_chain_add(table, chain);
2060         if (err < 0) {
2061                 nft_trans_destroy(trans);
2062                 goto err2;
2063         }
2064
2065         table->use++;
2066
2067         return 0;
2068 err2:
2069         nf_tables_unregister_hook(net, table, chain);
2070 err1:
2071         nf_tables_chain_destroy(ctx);
2072
2073         return err;
2074 }
2075
2076 static bool nft_hook_list_equal(struct list_head *hook_list1,
2077                                 struct list_head *hook_list2)
2078 {
2079         struct nft_hook *hook;
2080         int n = 0, m = 0;
2081
2082         n = 0;
2083         list_for_each_entry(hook, hook_list2, list) {
2084                 if (!nft_hook_list_find(hook_list1, hook))
2085                         return false;
2086
2087                 n++;
2088         }
2089         list_for_each_entry(hook, hook_list1, list)
2090                 m++;
2091
2092         return n == m;
2093 }
2094
2095 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2096                               u32 flags)
2097 {
2098         const struct nlattr * const *nla = ctx->nla;
2099         struct nft_table *table = ctx->table;
2100         struct nft_chain *chain = ctx->chain;
2101         struct nft_base_chain *basechain;
2102         struct nft_stats *stats = NULL;
2103         struct nft_chain_hook hook;
2104         struct nf_hook_ops *ops;
2105         struct nft_trans *trans;
2106         int err;
2107
2108         if (chain->flags ^ flags)
2109                 return -EOPNOTSUPP;
2110
2111         if (nla[NFTA_CHAIN_HOOK]) {
2112                 if (!nft_is_base_chain(chain))
2113                         return -EEXIST;
2114
2115                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2116                                            false);
2117                 if (err < 0)
2118                         return err;
2119
2120                 basechain = nft_base_chain(chain);
2121                 if (basechain->type != hook.type) {
2122                         nft_chain_release_hook(&hook);
2123                         return -EEXIST;
2124                 }
2125
2126                 if (ctx->family == NFPROTO_NETDEV) {
2127                         if (!nft_hook_list_equal(&basechain->hook_list,
2128                                                  &hook.list)) {
2129                                 nft_chain_release_hook(&hook);
2130                                 return -EEXIST;
2131                         }
2132                 } else {
2133                         ops = &basechain->ops;
2134                         if (ops->hooknum != hook.num ||
2135                             ops->priority != hook.priority) {
2136                                 nft_chain_release_hook(&hook);
2137                                 return -EEXIST;
2138                         }
2139                 }
2140                 nft_chain_release_hook(&hook);
2141         }
2142
2143         if (nla[NFTA_CHAIN_HANDLE] &&
2144             nla[NFTA_CHAIN_NAME]) {
2145                 struct nft_chain *chain2;
2146
2147                 chain2 = nft_chain_lookup(ctx->net, table,
2148                                           nla[NFTA_CHAIN_NAME], genmask);
2149                 if (!IS_ERR(chain2))
2150                         return -EEXIST;
2151         }
2152
2153         if (nla[NFTA_CHAIN_COUNTERS]) {
2154                 if (!nft_is_base_chain(chain))
2155                         return -EOPNOTSUPP;
2156
2157                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2158                 if (IS_ERR(stats))
2159                         return PTR_ERR(stats);
2160         }
2161
2162         err = -ENOMEM;
2163         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2164                                 sizeof(struct nft_trans_chain));
2165         if (trans == NULL)
2166                 goto err;
2167
2168         nft_trans_chain_stats(trans) = stats;
2169         nft_trans_chain_update(trans) = true;
2170
2171         if (nla[NFTA_CHAIN_POLICY])
2172                 nft_trans_chain_policy(trans) = policy;
2173         else
2174                 nft_trans_chain_policy(trans) = -1;
2175
2176         if (nla[NFTA_CHAIN_HANDLE] &&
2177             nla[NFTA_CHAIN_NAME]) {
2178                 struct nft_trans *tmp;
2179                 char *name;
2180
2181                 err = -ENOMEM;
2182                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2183                 if (!name)
2184                         goto err;
2185
2186                 err = -EEXIST;
2187                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2188                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2189                             tmp->ctx.table == table &&
2190                             nft_trans_chain_update(tmp) &&
2191                             nft_trans_chain_name(tmp) &&
2192                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2193                                 kfree(name);
2194                                 goto err;
2195                         }
2196                 }
2197
2198                 nft_trans_chain_name(trans) = name;
2199         }
2200         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2201
2202         return 0;
2203 err:
2204         free_percpu(stats);
2205         kfree(trans);
2206         return err;
2207 }
2208
2209 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2210                                                const struct nlattr *nla)
2211 {
2212         u32 id = ntohl(nla_get_be32(nla));
2213         struct nft_trans *trans;
2214
2215         list_for_each_entry(trans, &net->nft.commit_list, list) {
2216                 struct nft_chain *chain = trans->ctx.chain;
2217
2218                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2219                     id == nft_trans_chain_id(trans))
2220                         return chain;
2221         }
2222         return ERR_PTR(-ENOENT);
2223 }
2224
2225 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2226                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2227                               const struct nlattr * const nla[],
2228                               struct netlink_ext_ack *extack)
2229 {
2230         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2231         u8 genmask = nft_genmask_next(net);
2232         int family = nfmsg->nfgen_family;
2233         struct nft_chain *chain = NULL;
2234         const struct nlattr *attr;
2235         struct nft_table *table;
2236         u8 policy = NF_ACCEPT;
2237         struct nft_ctx ctx;
2238         u64 handle = 0;
2239         u32 flags = 0;
2240
2241         lockdep_assert_held(&net->nft.commit_mutex);
2242
2243         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2244         if (IS_ERR(table)) {
2245                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2246                 return PTR_ERR(table);
2247         }
2248
2249         chain = NULL;
2250         attr = nla[NFTA_CHAIN_NAME];
2251
2252         if (nla[NFTA_CHAIN_HANDLE]) {
2253                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2254                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2255                 if (IS_ERR(chain)) {
2256                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2257                         return PTR_ERR(chain);
2258                 }
2259                 attr = nla[NFTA_CHAIN_HANDLE];
2260         } else if (nla[NFTA_CHAIN_NAME]) {
2261                 chain = nft_chain_lookup(net, table, attr, genmask);
2262                 if (IS_ERR(chain)) {
2263                         if (PTR_ERR(chain) != -ENOENT) {
2264                                 NL_SET_BAD_ATTR(extack, attr);
2265                                 return PTR_ERR(chain);
2266                         }
2267                         chain = NULL;
2268                 }
2269         } else if (!nla[NFTA_CHAIN_ID]) {
2270                 return -EINVAL;
2271         }
2272
2273         if (nla[NFTA_CHAIN_POLICY]) {
2274                 if (chain != NULL &&
2275                     !nft_is_base_chain(chain)) {
2276                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2277                         return -EOPNOTSUPP;
2278                 }
2279
2280                 if (chain == NULL &&
2281                     nla[NFTA_CHAIN_HOOK] == NULL) {
2282                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2283                         return -EOPNOTSUPP;
2284                 }
2285
2286                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2287                 switch (policy) {
2288                 case NF_DROP:
2289                 case NF_ACCEPT:
2290                         break;
2291                 default:
2292                         return -EINVAL;
2293                 }
2294         }
2295
2296         if (nla[NFTA_CHAIN_FLAGS])
2297                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2298         else if (chain)
2299                 flags = chain->flags;
2300
2301         if (flags & ~NFT_CHAIN_FLAGS)
2302                 return -EOPNOTSUPP;
2303
2304         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2305
2306         if (chain != NULL) {
2307                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2308                         NL_SET_BAD_ATTR(extack, attr);
2309                         return -EEXIST;
2310                 }
2311                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2312                         return -EOPNOTSUPP;
2313
2314                 flags |= chain->flags & NFT_CHAIN_BASE;
2315                 return nf_tables_updchain(&ctx, genmask, policy, flags);
2316         }
2317
2318         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2319 }
2320
2321 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2322                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2323                               const struct nlattr * const nla[],
2324                               struct netlink_ext_ack *extack)
2325 {
2326         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2327         u8 genmask = nft_genmask_next(net);
2328         int family = nfmsg->nfgen_family;
2329         const struct nlattr *attr;
2330         struct nft_table *table;
2331         struct nft_chain *chain;
2332         struct nft_rule *rule;
2333         struct nft_ctx ctx;
2334         u64 handle;
2335         u32 use;
2336         int err;
2337
2338         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2339         if (IS_ERR(table)) {
2340                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2341                 return PTR_ERR(table);
2342         }
2343
2344         if (nla[NFTA_CHAIN_HANDLE]) {
2345                 attr = nla[NFTA_CHAIN_HANDLE];
2346                 handle = be64_to_cpu(nla_get_be64(attr));
2347                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2348         } else {
2349                 attr = nla[NFTA_CHAIN_NAME];
2350                 chain = nft_chain_lookup(net, table, attr, genmask);
2351         }
2352         if (IS_ERR(chain)) {
2353                 NL_SET_BAD_ATTR(extack, attr);
2354                 return PTR_ERR(chain);
2355         }
2356
2357         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2358             chain->use > 0)
2359                 return -EBUSY;
2360
2361         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2362
2363         use = chain->use;
2364         list_for_each_entry(rule, &chain->rules, list) {
2365                 if (!nft_is_active_next(net, rule))
2366                         continue;
2367                 use--;
2368
2369                 err = nft_delrule(&ctx, rule);
2370                 if (err < 0)
2371                         return err;
2372         }
2373
2374         /* There are rules and elements that are still holding references to us,
2375          * we cannot do a recursive removal in this case.
2376          */
2377         if (use > 0) {
2378                 NL_SET_BAD_ATTR(extack, attr);
2379                 return -EBUSY;
2380         }
2381
2382         return nft_delchain(&ctx);
2383 }
2384
2385 /*
2386  * Expressions
2387  */
2388
2389 /**
2390  *      nft_register_expr - register nf_tables expr type
2391  *      @type: expr type
2392  *
2393  *      Registers the expr type for use with nf_tables. Returns zero on
2394  *      success or a negative errno code otherwise.
2395  */
2396 int nft_register_expr(struct nft_expr_type *type)
2397 {
2398         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2399         if (type->family == NFPROTO_UNSPEC)
2400                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2401         else
2402                 list_add_rcu(&type->list, &nf_tables_expressions);
2403         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2404         return 0;
2405 }
2406 EXPORT_SYMBOL_GPL(nft_register_expr);
2407
2408 /**
2409  *      nft_unregister_expr - unregister nf_tables expr type
2410  *      @type: expr type
2411  *
2412  *      Unregisters the expr typefor use with nf_tables.
2413  */
2414 void nft_unregister_expr(struct nft_expr_type *type)
2415 {
2416         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2417         list_del_rcu(&type->list);
2418         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2419 }
2420 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2421
2422 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2423                                                        struct nlattr *nla)
2424 {
2425         const struct nft_expr_type *type, *candidate = NULL;
2426
2427         list_for_each_entry(type, &nf_tables_expressions, list) {
2428                 if (!nla_strcmp(nla, type->name)) {
2429                         if (!type->family && !candidate)
2430                                 candidate = type;
2431                         else if (type->family == family)
2432                                 candidate = type;
2433                 }
2434         }
2435         return candidate;
2436 }
2437
2438 #ifdef CONFIG_MODULES
2439 static int nft_expr_type_request_module(struct net *net, u8 family,
2440                                         struct nlattr *nla)
2441 {
2442         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2443                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2444                 return -EAGAIN;
2445
2446         return 0;
2447 }
2448 #endif
2449
2450 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2451                                                      u8 family,
2452                                                      struct nlattr *nla)
2453 {
2454         const struct nft_expr_type *type;
2455
2456         if (nla == NULL)
2457                 return ERR_PTR(-EINVAL);
2458
2459         type = __nft_expr_type_get(family, nla);
2460         if (type != NULL && try_module_get(type->owner))
2461                 return type;
2462
2463         lockdep_nfnl_nft_mutex_not_held();
2464 #ifdef CONFIG_MODULES
2465         if (type == NULL) {
2466                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2467                         return ERR_PTR(-EAGAIN);
2468
2469                 if (nft_request_module(net, "nft-expr-%.*s",
2470                                        nla_len(nla),
2471                                        (char *)nla_data(nla)) == -EAGAIN)
2472                         return ERR_PTR(-EAGAIN);
2473         }
2474 #endif
2475         return ERR_PTR(-ENOENT);
2476 }
2477
2478 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2479         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2480                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2481         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2482 };
2483
2484 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2485                                     const struct nft_expr *expr)
2486 {
2487         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2488                 goto nla_put_failure;
2489
2490         if (expr->ops->dump) {
2491                 struct nlattr *data = nla_nest_start_noflag(skb,
2492                                                             NFTA_EXPR_DATA);
2493                 if (data == NULL)
2494                         goto nla_put_failure;
2495                 if (expr->ops->dump(skb, expr) < 0)
2496                         goto nla_put_failure;
2497                 nla_nest_end(skb, data);
2498         }
2499
2500         return skb->len;
2501
2502 nla_put_failure:
2503         return -1;
2504 };
2505
2506 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2507                   const struct nft_expr *expr)
2508 {
2509         struct nlattr *nest;
2510
2511         nest = nla_nest_start_noflag(skb, attr);
2512         if (!nest)
2513                 goto nla_put_failure;
2514         if (nf_tables_fill_expr_info(skb, expr) < 0)
2515                 goto nla_put_failure;
2516         nla_nest_end(skb, nest);
2517         return 0;
2518
2519 nla_put_failure:
2520         return -1;
2521 }
2522
2523 struct nft_expr_info {
2524         const struct nft_expr_ops       *ops;
2525         const struct nlattr             *attr;
2526         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2527 };
2528
2529 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2530                                 const struct nlattr *nla,
2531                                 struct nft_expr_info *info)
2532 {
2533         const struct nft_expr_type *type;
2534         const struct nft_expr_ops *ops;
2535         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2536         int err;
2537
2538         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2539                                           nft_expr_policy, NULL);
2540         if (err < 0)
2541                 return err;
2542
2543         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2544         if (IS_ERR(type))
2545                 return PTR_ERR(type);
2546
2547         if (tb[NFTA_EXPR_DATA]) {
2548                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2549                                                   tb[NFTA_EXPR_DATA],
2550                                                   type->policy, NULL);
2551                 if (err < 0)
2552                         goto err1;
2553         } else
2554                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2555
2556         if (type->select_ops != NULL) {
2557                 ops = type->select_ops(ctx,
2558                                        (const struct nlattr * const *)info->tb);
2559                 if (IS_ERR(ops)) {
2560                         err = PTR_ERR(ops);
2561 #ifdef CONFIG_MODULES
2562                         if (err == -EAGAIN)
2563                                 if (nft_expr_type_request_module(ctx->net,
2564                                                                  ctx->family,
2565                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2566                                         err = -ENOENT;
2567 #endif
2568                         goto err1;
2569                 }
2570         } else
2571                 ops = type->ops;
2572
2573         info->attr = nla;
2574         info->ops = ops;
2575
2576         return 0;
2577
2578 err1:
2579         module_put(type->owner);
2580         return err;
2581 }
2582
2583 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2584                              const struct nft_expr_info *info,
2585                              struct nft_expr *expr)
2586 {
2587         const struct nft_expr_ops *ops = info->ops;
2588         int err;
2589
2590         expr->ops = ops;
2591         if (ops->init) {
2592                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2593                 if (err < 0)
2594                         goto err1;
2595         }
2596
2597         return 0;
2598 err1:
2599         expr->ops = NULL;
2600         return err;
2601 }
2602
2603 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2604                                    struct nft_expr *expr)
2605 {
2606         const struct nft_expr_type *type = expr->ops->type;
2607
2608         if (expr->ops->destroy)
2609                 expr->ops->destroy(ctx, expr);
2610         module_put(type->owner);
2611 }
2612
2613 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2614                                       const struct nlattr *nla)
2615 {
2616         struct nft_expr_info info;
2617         struct nft_expr *expr;
2618         struct module *owner;
2619         int err;
2620
2621         err = nf_tables_expr_parse(ctx, nla, &info);
2622         if (err < 0)
2623                 goto err1;
2624
2625         err = -ENOMEM;
2626         expr = kzalloc(info.ops->size, GFP_KERNEL);
2627         if (expr == NULL)
2628                 goto err2;
2629
2630         err = nf_tables_newexpr(ctx, &info, expr);
2631         if (err < 0)
2632                 goto err3;
2633
2634         return expr;
2635 err3:
2636         kfree(expr);
2637 err2:
2638         owner = info.ops->type->owner;
2639         if (info.ops->type->release_ops)
2640                 info.ops->type->release_ops(info.ops);
2641
2642         module_put(owner);
2643 err1:
2644         return ERR_PTR(err);
2645 }
2646
2647 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2648 {
2649         int err;
2650
2651         if (src->ops->clone) {
2652                 dst->ops = src->ops;
2653                 err = src->ops->clone(dst, src);
2654                 if (err < 0)
2655                         return err;
2656         } else {
2657                 memcpy(dst, src, src->ops->size);
2658         }
2659
2660         __module_get(src->ops->type->owner);
2661
2662         return 0;
2663 }
2664
2665 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2666 {
2667         nf_tables_expr_destroy(ctx, expr);
2668         kfree(expr);
2669 }
2670
2671 /*
2672  * Rules
2673  */
2674
2675 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2676                                           u64 handle)
2677 {
2678         struct nft_rule *rule;
2679
2680         // FIXME: this sucks
2681         list_for_each_entry_rcu(rule, &chain->rules, list) {
2682                 if (handle == rule->handle)
2683                         return rule;
2684         }
2685
2686         return ERR_PTR(-ENOENT);
2687 }
2688
2689 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2690                                         const struct nlattr *nla)
2691 {
2692         if (nla == NULL)
2693                 return ERR_PTR(-EINVAL);
2694
2695         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2696 }
2697
2698 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2699         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2700                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2701         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2702                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2703         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2704         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2705         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2706         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2707         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2708                                     .len = NFT_USERDATA_MAXLEN },
2709         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2710         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2711         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2712 };
2713
2714 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2715                                     u32 portid, u32 seq, int event,
2716                                     u32 flags, int family,
2717                                     const struct nft_table *table,
2718                                     const struct nft_chain *chain,
2719                                     const struct nft_rule *rule,
2720                                     const struct nft_rule *prule)
2721 {
2722         struct nlmsghdr *nlh;
2723         struct nfgenmsg *nfmsg;
2724         const struct nft_expr *expr, *next;
2725         struct nlattr *list;
2726         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2727
2728         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2729         if (nlh == NULL)
2730                 goto nla_put_failure;
2731
2732         nfmsg = nlmsg_data(nlh);
2733         nfmsg->nfgen_family     = family;
2734         nfmsg->version          = NFNETLINK_V0;
2735         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2736
2737         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2738                 goto nla_put_failure;
2739         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2740                 goto nla_put_failure;
2741         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2742                          NFTA_RULE_PAD))
2743                 goto nla_put_failure;
2744
2745         if (event != NFT_MSG_DELRULE && prule) {
2746                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2747                                  cpu_to_be64(prule->handle),
2748                                  NFTA_RULE_PAD))
2749                         goto nla_put_failure;
2750         }
2751
2752         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2753         if (list == NULL)
2754                 goto nla_put_failure;
2755         nft_rule_for_each_expr(expr, next, rule) {
2756                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2757                         goto nla_put_failure;
2758         }
2759         nla_nest_end(skb, list);
2760
2761         if (rule->udata) {
2762                 struct nft_userdata *udata = nft_userdata(rule);
2763                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2764                             udata->data) < 0)
2765                         goto nla_put_failure;
2766         }
2767
2768         nlmsg_end(skb, nlh);
2769         return 0;
2770
2771 nla_put_failure:
2772         nlmsg_trim(skb, nlh);
2773         return -1;
2774 }
2775
2776 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2777                                   const struct nft_rule *rule, int event)
2778 {
2779         struct sk_buff *skb;
2780         int err;
2781         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2782                               ctx->table->name, ctx->table->handle,
2783                               ctx->chain->name, ctx->chain->handle);
2784
2785         audit_log_nfcfg(buf,
2786                         ctx->family,
2787                         rule->handle,
2788                         event == NFT_MSG_NEWRULE ?
2789                                 AUDIT_NFT_OP_RULE_REGISTER :
2790                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2791                         GFP_KERNEL);
2792         kfree(buf);
2793
2794         if (!ctx->report &&
2795             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2796                 return;
2797
2798         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2799         if (skb == NULL)
2800                 goto err;
2801
2802         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2803                                        event, 0, ctx->family, ctx->table,
2804                                        ctx->chain, rule, NULL);
2805         if (err < 0) {
2806                 kfree_skb(skb);
2807                 goto err;
2808         }
2809
2810         nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
2811                        ctx->report, GFP_KERNEL);
2812         return;
2813 err:
2814         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2815 }
2816
2817 struct nft_rule_dump_ctx {
2818         char *table;
2819         char *chain;
2820 };
2821
2822 static int __nf_tables_dump_rules(struct sk_buff *skb,
2823                                   unsigned int *idx,
2824                                   struct netlink_callback *cb,
2825                                   const struct nft_table *table,
2826                                   const struct nft_chain *chain)
2827 {
2828         struct net *net = sock_net(skb->sk);
2829         const struct nft_rule *rule, *prule;
2830         unsigned int s_idx = cb->args[0];
2831
2832         prule = NULL;
2833         list_for_each_entry_rcu(rule, &chain->rules, list) {
2834                 if (!nft_is_active(net, rule))
2835                         goto cont_skip;
2836                 if (*idx < s_idx)
2837                         goto cont;
2838                 if (*idx > s_idx) {
2839                         memset(&cb->args[1], 0,
2840                                         sizeof(cb->args) - sizeof(cb->args[0]));
2841                 }
2842                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2843                                         cb->nlh->nlmsg_seq,
2844                                         NFT_MSG_NEWRULE,
2845                                         NLM_F_MULTI | NLM_F_APPEND,
2846                                         table->family,
2847                                         table, chain, rule, prule) < 0)
2848                         return 1;
2849
2850                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2851 cont:
2852                 prule = rule;
2853 cont_skip:
2854                 (*idx)++;
2855         }
2856         return 0;
2857 }
2858
2859 static int nf_tables_dump_rules(struct sk_buff *skb,
2860                                 struct netlink_callback *cb)
2861 {
2862         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2863         const struct nft_rule_dump_ctx *ctx = cb->data;
2864         struct nft_table *table;
2865         const struct nft_chain *chain;
2866         unsigned int idx = 0;
2867         struct net *net = sock_net(skb->sk);
2868         int family = nfmsg->nfgen_family;
2869
2870         rcu_read_lock();
2871         cb->seq = net->nft.base_seq;
2872
2873         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2874                 if (family != NFPROTO_UNSPEC && family != table->family)
2875                         continue;
2876
2877                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2878                         continue;
2879
2880                 if (ctx && ctx->table && ctx->chain) {
2881                         struct rhlist_head *list, *tmp;
2882
2883                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2884                                                nft_chain_ht_params);
2885                         if (!list)
2886                                 goto done;
2887
2888                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2889                                 if (!nft_is_active(net, chain))
2890                                         continue;
2891                                 __nf_tables_dump_rules(skb, &idx,
2892                                                        cb, table, chain);
2893                                 break;
2894                         }
2895                         goto done;
2896                 }
2897
2898                 list_for_each_entry_rcu(chain, &table->chains, list) {
2899                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2900                                 goto done;
2901                 }
2902
2903                 if (ctx && ctx->table)
2904                         break;
2905         }
2906 done:
2907         rcu_read_unlock();
2908
2909         cb->args[0] = idx;
2910         return skb->len;
2911 }
2912
2913 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2914 {
2915         const struct nlattr * const *nla = cb->data;
2916         struct nft_rule_dump_ctx *ctx = NULL;
2917
2918         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2919                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2920                 if (!ctx)
2921                         return -ENOMEM;
2922
2923                 if (nla[NFTA_RULE_TABLE]) {
2924                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2925                                                         GFP_ATOMIC);
2926                         if (!ctx->table) {
2927                                 kfree(ctx);
2928                                 return -ENOMEM;
2929                         }
2930                 }
2931                 if (nla[NFTA_RULE_CHAIN]) {
2932                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2933                                                 GFP_ATOMIC);
2934                         if (!ctx->chain) {
2935                                 kfree(ctx->table);
2936                                 kfree(ctx);
2937                                 return -ENOMEM;
2938                         }
2939                 }
2940         }
2941
2942         cb->data = ctx;
2943         return 0;
2944 }
2945
2946 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
2947 {
2948         struct nft_rule_dump_ctx *ctx = cb->data;
2949
2950         if (ctx) {
2951                 kfree(ctx->table);
2952                 kfree(ctx->chain);
2953                 kfree(ctx);
2954         }
2955         return 0;
2956 }
2957
2958 /* called with rcu_read_lock held */
2959 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
2960                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2961                              const struct nlattr * const nla[],
2962                              struct netlink_ext_ack *extack)
2963 {
2964         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2965         u8 genmask = nft_genmask_cur(net);
2966         const struct nft_chain *chain;
2967         const struct nft_rule *rule;
2968         struct nft_table *table;
2969         struct sk_buff *skb2;
2970         int family = nfmsg->nfgen_family;
2971         int err;
2972
2973         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2974                 struct netlink_dump_control c = {
2975                         .start= nf_tables_dump_rules_start,
2976                         .dump = nf_tables_dump_rules,
2977                         .done = nf_tables_dump_rules_done,
2978                         .module = THIS_MODULE,
2979                         .data = (void *)nla,
2980                 };
2981
2982                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
2983         }
2984
2985         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
2986         if (IS_ERR(table)) {
2987                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
2988                 return PTR_ERR(table);
2989         }
2990
2991         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
2992         if (IS_ERR(chain)) {
2993                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
2994                 return PTR_ERR(chain);
2995         }
2996
2997         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
2998         if (IS_ERR(rule)) {
2999                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3000                 return PTR_ERR(rule);
3001         }
3002
3003         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3004         if (!skb2)
3005                 return -ENOMEM;
3006
3007         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3008                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3009                                        family, table, chain, rule, NULL);
3010         if (err < 0)
3011                 goto err_fill_rule_info;
3012
3013         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3014
3015 err_fill_rule_info:
3016         kfree_skb(skb2);
3017         return err;
3018 }
3019
3020 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3021                                    struct nft_rule *rule)
3022 {
3023         struct nft_expr *expr, *next;
3024
3025         /*
3026          * Careful: some expressions might not be initialized in case this
3027          * is called on error from nf_tables_newrule().
3028          */
3029         expr = nft_expr_first(rule);
3030         while (expr != nft_expr_last(rule) && expr->ops) {
3031                 next = nft_expr_next(expr);
3032                 nf_tables_expr_destroy(ctx, expr);
3033                 expr = next;
3034         }
3035         kfree(rule);
3036 }
3037
3038 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3039 {
3040         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3041         nf_tables_rule_destroy(ctx, rule);
3042 }
3043
3044 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3045 {
3046         struct nft_expr *expr, *last;
3047         const struct nft_data *data;
3048         struct nft_rule *rule;
3049         int err;
3050
3051         if (ctx->level == NFT_JUMP_STACK_SIZE)
3052                 return -EMLINK;
3053
3054         list_for_each_entry(rule, &chain->rules, list) {
3055                 if (!nft_is_active_next(ctx->net, rule))
3056                         continue;
3057
3058                 nft_rule_for_each_expr(expr, last, rule) {
3059                         if (!expr->ops->validate)
3060                                 continue;
3061
3062                         err = expr->ops->validate(ctx, expr, &data);
3063                         if (err < 0)
3064                                 return err;
3065                 }
3066         }
3067
3068         return 0;
3069 }
3070 EXPORT_SYMBOL_GPL(nft_chain_validate);
3071
3072 static int nft_table_validate(struct net *net, const struct nft_table *table)
3073 {
3074         struct nft_chain *chain;
3075         struct nft_ctx ctx = {
3076                 .net    = net,
3077                 .family = table->family,
3078         };
3079         int err;
3080
3081         list_for_each_entry(chain, &table->chains, list) {
3082                 if (!nft_is_base_chain(chain))
3083                         continue;
3084
3085                 ctx.chain = chain;
3086                 err = nft_chain_validate(&ctx, chain);
3087                 if (err < 0)
3088                         return err;
3089         }
3090
3091         return 0;
3092 }
3093
3094 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3095                                              const struct nlattr *nla);
3096
3097 #define NFT_RULE_MAXEXPRS       128
3098
3099 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3100                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3101                              const struct nlattr * const nla[],
3102                              struct netlink_ext_ack *extack)
3103 {
3104         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3105         u8 genmask = nft_genmask_next(net);
3106         struct nft_expr_info *info = NULL;
3107         int family = nfmsg->nfgen_family;
3108         struct nft_flow_rule *flow;
3109         struct nft_table *table;
3110         struct nft_chain *chain;
3111         struct nft_rule *rule, *old_rule = NULL;
3112         struct nft_userdata *udata;
3113         struct nft_trans *trans = NULL;
3114         struct nft_expr *expr;
3115         struct nft_ctx ctx;
3116         struct nlattr *tmp;
3117         unsigned int size, i, n, ulen = 0, usize = 0;
3118         int err, rem;
3119         u64 handle, pos_handle;
3120
3121         lockdep_assert_held(&net->nft.commit_mutex);
3122
3123         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3124         if (IS_ERR(table)) {
3125                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3126                 return PTR_ERR(table);
3127         }
3128
3129         if (nla[NFTA_RULE_CHAIN]) {
3130                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3131                                          genmask);
3132                 if (IS_ERR(chain)) {
3133                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3134                         return PTR_ERR(chain);
3135                 }
3136                 if (nft_chain_is_bound(chain))
3137                         return -EOPNOTSUPP;
3138
3139         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3140                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3141                 if (IS_ERR(chain)) {
3142                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3143                         return PTR_ERR(chain);
3144                 }
3145         } else {
3146                 return -EINVAL;
3147         }
3148
3149         if (nla[NFTA_RULE_HANDLE]) {
3150                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3151                 rule = __nft_rule_lookup(chain, handle);
3152                 if (IS_ERR(rule)) {
3153                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3154                         return PTR_ERR(rule);
3155                 }
3156
3157                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3158                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3159                         return -EEXIST;
3160                 }
3161                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3162                         old_rule = rule;
3163                 else
3164                         return -EOPNOTSUPP;
3165         } else {
3166                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3167                     nlh->nlmsg_flags & NLM_F_REPLACE)
3168                         return -EINVAL;
3169                 handle = nf_tables_alloc_handle(table);
3170
3171                 if (chain->use == UINT_MAX)
3172                         return -EOVERFLOW;
3173
3174                 if (nla[NFTA_RULE_POSITION]) {
3175                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3176                         old_rule = __nft_rule_lookup(chain, pos_handle);
3177                         if (IS_ERR(old_rule)) {
3178                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3179                                 return PTR_ERR(old_rule);
3180                         }
3181                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3182                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3183                         if (IS_ERR(old_rule)) {
3184                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3185                                 return PTR_ERR(old_rule);
3186                         }
3187                 }
3188         }
3189
3190         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3191
3192         n = 0;
3193         size = 0;
3194         if (nla[NFTA_RULE_EXPRESSIONS]) {
3195                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3196                                       sizeof(struct nft_expr_info),
3197                                       GFP_KERNEL);
3198                 if (!info)
3199                         return -ENOMEM;
3200
3201                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3202                         err = -EINVAL;
3203                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3204                                 goto err1;
3205                         if (n == NFT_RULE_MAXEXPRS)
3206                                 goto err1;
3207                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3208                         if (err < 0)
3209                                 goto err1;
3210                         size += info[n].ops->size;
3211                         n++;
3212                 }
3213         }
3214         /* Check for overflow of dlen field */
3215         err = -EFBIG;
3216         if (size >= 1 << 12)
3217                 goto err1;
3218
3219         if (nla[NFTA_RULE_USERDATA]) {
3220                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3221                 if (ulen > 0)
3222                         usize = sizeof(struct nft_userdata) + ulen;
3223         }
3224
3225         err = -ENOMEM;
3226         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3227         if (rule == NULL)
3228                 goto err1;
3229
3230         nft_activate_next(net, rule);
3231
3232         rule->handle = handle;
3233         rule->dlen   = size;
3234         rule->udata  = ulen ? 1 : 0;
3235
3236         if (ulen) {
3237                 udata = nft_userdata(rule);
3238                 udata->len = ulen - 1;
3239                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3240         }
3241
3242         expr = nft_expr_first(rule);
3243         for (i = 0; i < n; i++) {
3244                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3245                 if (err < 0) {
3246                         NL_SET_BAD_ATTR(extack, info[i].attr);
3247                         goto err2;
3248                 }
3249
3250                 if (info[i].ops->validate)
3251                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3252
3253                 info[i].ops = NULL;
3254                 expr = nft_expr_next(expr);
3255         }
3256
3257         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3258                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3259                 if (trans == NULL) {
3260                         err = -ENOMEM;
3261                         goto err2;
3262                 }
3263                 err = nft_delrule(&ctx, old_rule);
3264                 if (err < 0) {
3265                         nft_trans_destroy(trans);
3266                         goto err2;
3267                 }
3268
3269                 list_add_tail_rcu(&rule->list, &old_rule->list);
3270         } else {
3271                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3272                 if (!trans) {
3273                         err = -ENOMEM;
3274                         goto err2;
3275                 }
3276
3277                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3278                         if (old_rule)
3279                                 list_add_rcu(&rule->list, &old_rule->list);
3280                         else
3281                                 list_add_tail_rcu(&rule->list, &chain->rules);
3282                  } else {
3283                         if (old_rule)
3284                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3285                         else
3286                                 list_add_rcu(&rule->list, &chain->rules);
3287                 }
3288         }
3289         kvfree(info);
3290         chain->use++;
3291
3292         if (net->nft.validate_state == NFT_VALIDATE_DO)
3293                 return nft_table_validate(net, table);
3294
3295         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3296                 flow = nft_flow_rule_create(net, rule);
3297                 if (IS_ERR(flow))
3298                         return PTR_ERR(flow);
3299
3300                 nft_trans_flow_rule(trans) = flow;
3301         }
3302
3303         return 0;
3304 err2:
3305         nf_tables_rule_release(&ctx, rule);
3306 err1:
3307         for (i = 0; i < n; i++) {
3308                 if (info[i].ops) {
3309                         module_put(info[i].ops->type->owner);
3310                         if (info[i].ops->type->release_ops)
3311                                 info[i].ops->type->release_ops(info[i].ops);
3312                 }
3313         }
3314         kvfree(info);
3315         return err;
3316 }
3317
3318 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3319                                              const struct nlattr *nla)
3320 {
3321         u32 id = ntohl(nla_get_be32(nla));
3322         struct nft_trans *trans;
3323
3324         list_for_each_entry(trans, &net->nft.commit_list, list) {
3325                 struct nft_rule *rule = nft_trans_rule(trans);
3326
3327                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3328                     id == nft_trans_rule_id(trans))
3329                         return rule;
3330         }
3331         return ERR_PTR(-ENOENT);
3332 }
3333
3334 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3335                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3336                              const struct nlattr * const nla[],
3337                              struct netlink_ext_ack *extack)
3338 {
3339         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3340         u8 genmask = nft_genmask_next(net);
3341         struct nft_table *table;
3342         struct nft_chain *chain = NULL;
3343         struct nft_rule *rule;
3344         int family = nfmsg->nfgen_family, err = 0;
3345         struct nft_ctx ctx;
3346
3347         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3348         if (IS_ERR(table)) {
3349                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3350                 return PTR_ERR(table);
3351         }
3352
3353         if (nla[NFTA_RULE_CHAIN]) {
3354                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3355                                          genmask);
3356                 if (IS_ERR(chain)) {
3357                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3358                         return PTR_ERR(chain);
3359                 }
3360                 if (nft_chain_is_bound(chain))
3361                         return -EOPNOTSUPP;
3362         }
3363
3364         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3365
3366         if (chain) {
3367                 if (nla[NFTA_RULE_HANDLE]) {
3368                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3369                         if (IS_ERR(rule)) {
3370                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3371                                 return PTR_ERR(rule);
3372                         }
3373
3374                         err = nft_delrule(&ctx, rule);
3375                 } else if (nla[NFTA_RULE_ID]) {
3376                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3377                         if (IS_ERR(rule)) {
3378                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3379                                 return PTR_ERR(rule);
3380                         }
3381
3382                         err = nft_delrule(&ctx, rule);
3383                 } else {
3384                         err = nft_delrule_by_chain(&ctx);
3385                 }
3386         } else {
3387                 list_for_each_entry(chain, &table->chains, list) {
3388                         if (!nft_is_active_next(net, chain))
3389                                 continue;
3390
3391                         ctx.chain = chain;
3392                         err = nft_delrule_by_chain(&ctx);
3393                         if (err < 0)
3394                                 break;
3395                 }
3396         }
3397
3398         return err;
3399 }
3400
3401 /*
3402  * Sets
3403  */
3404 static const struct nft_set_type *nft_set_types[] = {
3405         &nft_set_hash_fast_type,
3406         &nft_set_hash_type,
3407         &nft_set_rhash_type,
3408         &nft_set_bitmap_type,
3409         &nft_set_rbtree_type,
3410 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3411         &nft_set_pipapo_avx2_type,
3412 #endif
3413         &nft_set_pipapo_type,
3414 };
3415
3416 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3417                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3418                                  NFT_SET_EVAL)
3419
3420 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3421 {
3422         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3423 }
3424
3425 /*
3426  * Select a set implementation based on the data characteristics and the
3427  * given policy. The total memory use might not be known if no size is
3428  * given, in that case the amount of memory per element is used.
3429  */
3430 static const struct nft_set_ops *
3431 nft_select_set_ops(const struct nft_ctx *ctx,
3432                    const struct nlattr * const nla[],
3433                    const struct nft_set_desc *desc,
3434                    enum nft_set_policies policy)
3435 {
3436         const struct nft_set_ops *ops, *bops;
3437         struct nft_set_estimate est, best;
3438         const struct nft_set_type *type;
3439         u32 flags = 0;
3440         int i;
3441
3442         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3443         lockdep_nfnl_nft_mutex_not_held();
3444
3445         if (nla[NFTA_SET_FLAGS] != NULL)
3446                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3447
3448         bops        = NULL;
3449         best.size   = ~0;
3450         best.lookup = ~0;
3451         best.space  = ~0;
3452
3453         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3454                 type = nft_set_types[i];
3455                 ops = &type->ops;
3456
3457                 if (!nft_set_ops_candidate(type, flags))
3458                         continue;
3459                 if (!ops->estimate(desc, flags, &est))
3460                         continue;
3461
3462                 switch (policy) {
3463                 case NFT_SET_POL_PERFORMANCE:
3464                         if (est.lookup < best.lookup)
3465                                 break;
3466                         if (est.lookup == best.lookup &&
3467                             est.space < best.space)
3468                                 break;
3469                         continue;
3470                 case NFT_SET_POL_MEMORY:
3471                         if (!desc->size) {
3472                                 if (est.space < best.space)
3473                                         break;
3474                                 if (est.space == best.space &&
3475                                     est.lookup < best.lookup)
3476                                         break;
3477                         } else if (est.size < best.size || !bops) {
3478                                 break;
3479                         }
3480                         continue;
3481                 default:
3482                         break;
3483                 }
3484
3485                 bops = ops;
3486                 best = est;
3487         }
3488
3489         if (bops != NULL)
3490                 return bops;
3491
3492         return ERR_PTR(-EOPNOTSUPP);
3493 }
3494
3495 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3496         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3497                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3498         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3499                                             .len = NFT_SET_MAXNAMELEN - 1 },
3500         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3501         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3502         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3503         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3504         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3505         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3506         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3507         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3508         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3509         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3510         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3511                                             .len  = NFT_USERDATA_MAXLEN },
3512         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3513         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3514         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3515 };
3516
3517 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3518         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3519         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3520 };
3521
3522 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3523                                      const struct sk_buff *skb,
3524                                      const struct nlmsghdr *nlh,
3525                                      const struct nlattr * const nla[],
3526                                      struct netlink_ext_ack *extack,
3527                                      u8 genmask)
3528 {
3529         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3530         int family = nfmsg->nfgen_family;
3531         struct nft_table *table = NULL;
3532
3533         if (nla[NFTA_SET_TABLE] != NULL) {
3534                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3535                                          genmask);
3536                 if (IS_ERR(table)) {
3537                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3538                         return PTR_ERR(table);
3539                 }
3540         }
3541
3542         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3543         return 0;
3544 }
3545
3546 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3547                                       const struct nlattr *nla, u8 genmask)
3548 {
3549         struct nft_set *set;
3550
3551         if (nla == NULL)
3552                 return ERR_PTR(-EINVAL);
3553
3554         list_for_each_entry_rcu(set, &table->sets, list) {
3555                 if (!nla_strcmp(nla, set->name) &&
3556                     nft_active_genmask(set, genmask))
3557                         return set;
3558         }
3559         return ERR_PTR(-ENOENT);
3560 }
3561
3562 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3563                                                const struct nlattr *nla,
3564                                                u8 genmask)
3565 {
3566         struct nft_set *set;
3567
3568         list_for_each_entry(set, &table->sets, list) {
3569                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3570                     nft_active_genmask(set, genmask))
3571                         return set;
3572         }
3573         return ERR_PTR(-ENOENT);
3574 }
3575
3576 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3577                                            const struct nlattr *nla, u8 genmask)
3578 {
3579         struct nft_trans *trans;
3580         u32 id = ntohl(nla_get_be32(nla));
3581
3582         list_for_each_entry(trans, &net->nft.commit_list, list) {
3583                 if (trans->msg_type == NFT_MSG_NEWSET) {
3584                         struct nft_set *set = nft_trans_set(trans);
3585
3586                         if (id == nft_trans_set_id(trans) &&
3587                             nft_active_genmask(set, genmask))
3588                                 return set;
3589                 }
3590         }
3591         return ERR_PTR(-ENOENT);
3592 }
3593
3594 struct nft_set *nft_set_lookup_global(const struct net *net,
3595                                       const struct nft_table *table,
3596                                       const struct nlattr *nla_set_name,
3597                                       const struct nlattr *nla_set_id,
3598                                       u8 genmask)
3599 {
3600         struct nft_set *set;
3601
3602         set = nft_set_lookup(table, nla_set_name, genmask);
3603         if (IS_ERR(set)) {
3604                 if (!nla_set_id)
3605                         return set;
3606
3607                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3608         }
3609         return set;
3610 }
3611 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3612
3613 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3614                                     const char *name)
3615 {
3616         const struct nft_set *i;
3617         const char *p;
3618         unsigned long *inuse;
3619         unsigned int n = 0, min = 0;
3620
3621         p = strchr(name, '%');
3622         if (p != NULL) {
3623                 if (p[1] != 'd' || strchr(p + 2, '%'))
3624                         return -EINVAL;
3625
3626                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3627                 if (inuse == NULL)
3628                         return -ENOMEM;
3629 cont:
3630                 list_for_each_entry(i, &ctx->table->sets, list) {
3631                         int tmp;
3632
3633                         if (!nft_is_active_next(ctx->net, set))
3634                                 continue;
3635                         if (!sscanf(i->name, name, &tmp))
3636                                 continue;
3637                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3638                                 continue;
3639
3640                         set_bit(tmp - min, inuse);
3641                 }
3642
3643                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3644                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3645                         min += BITS_PER_BYTE * PAGE_SIZE;
3646                         memset(inuse, 0, PAGE_SIZE);
3647                         goto cont;
3648                 }
3649                 free_page((unsigned long)inuse);
3650         }
3651
3652         set->name = kasprintf(GFP_KERNEL, name, min + n);
3653         if (!set->name)
3654                 return -ENOMEM;
3655
3656         list_for_each_entry(i, &ctx->table->sets, list) {
3657                 if (!nft_is_active_next(ctx->net, i))
3658                         continue;
3659                 if (!strcmp(set->name, i->name)) {
3660                         kfree(set->name);
3661                         set->name = NULL;
3662                         return -ENFILE;
3663                 }
3664         }
3665         return 0;
3666 }
3667
3668 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3669 {
3670         u64 ms = be64_to_cpu(nla_get_be64(nla));
3671         u64 max = (u64)(~((u64)0));
3672
3673         max = div_u64(max, NSEC_PER_MSEC);
3674         if (ms >= max)
3675                 return -ERANGE;
3676
3677         ms *= NSEC_PER_MSEC;
3678         *result = nsecs_to_jiffies64(ms);
3679         return 0;
3680 }
3681
3682 static __be64 nf_jiffies64_to_msecs(u64 input)
3683 {
3684         return cpu_to_be64(jiffies64_to_msecs(input));
3685 }
3686
3687 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3688                                      const struct nft_set *set)
3689 {
3690         struct nlattr *concat, *field;
3691         int i;
3692
3693         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3694         if (!concat)
3695                 return -ENOMEM;
3696
3697         for (i = 0; i < set->field_count; i++) {
3698                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3699                 if (!field)
3700                         return -ENOMEM;
3701
3702                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3703                                  htonl(set->field_len[i])))
3704                         return -ENOMEM;
3705
3706                 nla_nest_end(skb, field);
3707         }
3708
3709         nla_nest_end(skb, concat);
3710
3711         return 0;
3712 }
3713
3714 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3715                               const struct nft_set *set, u16 event, u16 flags)
3716 {
3717         struct nfgenmsg *nfmsg;
3718         struct nlmsghdr *nlh;
3719         u32 portid = ctx->portid;
3720         struct nlattr *nest;
3721         u32 seq = ctx->seq;
3722
3723         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3724         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3725                         flags);
3726         if (nlh == NULL)
3727                 goto nla_put_failure;
3728
3729         nfmsg = nlmsg_data(nlh);
3730         nfmsg->nfgen_family     = ctx->family;
3731         nfmsg->version          = NFNETLINK_V0;
3732         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3733
3734         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3735                 goto nla_put_failure;
3736         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3737                 goto nla_put_failure;
3738         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3739                          NFTA_SET_PAD))
3740                 goto nla_put_failure;
3741         if (set->flags != 0)
3742                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3743                         goto nla_put_failure;
3744
3745         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3746                 goto nla_put_failure;
3747         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3748                 goto nla_put_failure;
3749         if (set->flags & NFT_SET_MAP) {
3750                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3751                         goto nla_put_failure;
3752                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3753                         goto nla_put_failure;
3754         }
3755         if (set->flags & NFT_SET_OBJECT &&
3756             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3757                 goto nla_put_failure;
3758
3759         if (set->timeout &&
3760             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3761                          nf_jiffies64_to_msecs(set->timeout),
3762                          NFTA_SET_PAD))
3763                 goto nla_put_failure;
3764         if (set->gc_int &&
3765             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3766                 goto nla_put_failure;
3767
3768         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3769                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3770                         goto nla_put_failure;
3771         }
3772
3773         if (set->udata &&
3774             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3775                 goto nla_put_failure;
3776
3777         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3778         if (!nest)
3779                 goto nla_put_failure;
3780         if (set->size &&
3781             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3782                 goto nla_put_failure;
3783
3784         if (set->field_count > 1 &&
3785             nf_tables_fill_set_concat(skb, set))
3786                 goto nla_put_failure;
3787
3788         nla_nest_end(skb, nest);
3789
3790         if (set->expr) {
3791                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3792                 if (nf_tables_fill_expr_info(skb, set->expr) < 0)
3793                         goto nla_put_failure;
3794
3795                 nla_nest_end(skb, nest);
3796         }
3797
3798         nlmsg_end(skb, nlh);
3799         return 0;
3800
3801 nla_put_failure:
3802         nlmsg_trim(skb, nlh);
3803         return -1;
3804 }
3805
3806 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3807                                  const struct nft_set *set, int event,
3808                                  gfp_t gfp_flags)
3809 {
3810         struct sk_buff *skb;
3811         u32 portid = ctx->portid;
3812         int err;
3813         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3814                               ctx->table->name, ctx->table->handle,
3815                               set->name, set->handle);
3816
3817         audit_log_nfcfg(buf,
3818                         ctx->family,
3819                         set->field_count,
3820                         event == NFT_MSG_NEWSET ?
3821                                 AUDIT_NFT_OP_SET_REGISTER :
3822                                 AUDIT_NFT_OP_SET_UNREGISTER,
3823                         gfp_flags);
3824         kfree(buf);
3825
3826         if (!ctx->report &&
3827             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3828                 return;
3829
3830         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3831         if (skb == NULL)
3832                 goto err;
3833
3834         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3835         if (err < 0) {
3836                 kfree_skb(skb);
3837                 goto err;
3838         }
3839
3840         nfnetlink_send(skb, ctx->net, portid, NFNLGRP_NFTABLES, ctx->report,
3841                        gfp_flags);
3842         return;
3843 err:
3844         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3845 }
3846
3847 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3848 {
3849         const struct nft_set *set;
3850         unsigned int idx, s_idx = cb->args[0];
3851         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3852         struct net *net = sock_net(skb->sk);
3853         struct nft_ctx *ctx = cb->data, ctx_set;
3854
3855         if (cb->args[1])
3856                 return skb->len;
3857
3858         rcu_read_lock();
3859         cb->seq = net->nft.base_seq;
3860
3861         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3862                 if (ctx->family != NFPROTO_UNSPEC &&
3863                     ctx->family != table->family)
3864                         continue;
3865
3866                 if (ctx->table && ctx->table != table)
3867                         continue;
3868
3869                 if (cur_table) {
3870                         if (cur_table != table)
3871                                 continue;
3872
3873                         cur_table = NULL;
3874                 }
3875                 idx = 0;
3876                 list_for_each_entry_rcu(set, &table->sets, list) {
3877                         if (idx < s_idx)
3878                                 goto cont;
3879                         if (!nft_is_active(net, set))
3880                                 goto cont;
3881
3882                         ctx_set = *ctx;
3883                         ctx_set.table = table;
3884                         ctx_set.family = table->family;
3885
3886                         if (nf_tables_fill_set(skb, &ctx_set, set,
3887                                                NFT_MSG_NEWSET,
3888                                                NLM_F_MULTI) < 0) {
3889                                 cb->args[0] = idx;
3890                                 cb->args[2] = (unsigned long) table;
3891                                 goto done;
3892                         }
3893                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3894 cont:
3895                         idx++;
3896                 }
3897                 if (s_idx)
3898                         s_idx = 0;
3899         }
3900         cb->args[1] = 1;
3901 done:
3902         rcu_read_unlock();
3903         return skb->len;
3904 }
3905
3906 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3907 {
3908         struct nft_ctx *ctx_dump = NULL;
3909
3910         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3911         if (ctx_dump == NULL)
3912                 return -ENOMEM;
3913
3914         cb->data = ctx_dump;
3915         return 0;
3916 }
3917
3918 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3919 {
3920         kfree(cb->data);
3921         return 0;
3922 }
3923
3924 /* called with rcu_read_lock held */
3925 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3926                             struct sk_buff *skb, const struct nlmsghdr *nlh,
3927                             const struct nlattr * const nla[],
3928                             struct netlink_ext_ack *extack)
3929 {
3930         u8 genmask = nft_genmask_cur(net);
3931         const struct nft_set *set;
3932         struct nft_ctx ctx;
3933         struct sk_buff *skb2;
3934         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3935         int err;
3936
3937         /* Verify existence before starting dump */
3938         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3939                                         genmask);
3940         if (err < 0)
3941                 return err;
3942
3943         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3944                 struct netlink_dump_control c = {
3945                         .start = nf_tables_dump_sets_start,
3946                         .dump = nf_tables_dump_sets,
3947                         .done = nf_tables_dump_sets_done,
3948                         .data = &ctx,
3949                         .module = THIS_MODULE,
3950                 };
3951
3952                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3953         }
3954
3955         /* Only accept unspec with dump */
3956         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
3957                 return -EAFNOSUPPORT;
3958         if (!nla[NFTA_SET_TABLE])
3959                 return -EINVAL;
3960
3961         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
3962         if (IS_ERR(set))
3963                 return PTR_ERR(set);
3964
3965         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3966         if (skb2 == NULL)
3967                 return -ENOMEM;
3968
3969         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
3970         if (err < 0)
3971                 goto err_fill_set_info;
3972
3973         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3974
3975 err_fill_set_info:
3976         kfree_skb(skb2);
3977         return err;
3978 }
3979
3980 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
3981         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
3982 };
3983
3984 static int nft_set_desc_concat_parse(const struct nlattr *attr,
3985                                      struct nft_set_desc *desc)
3986 {
3987         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
3988         u32 len;
3989         int err;
3990
3991         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
3992                                           nft_concat_policy, NULL);
3993         if (err < 0)
3994                 return err;
3995
3996         if (!tb[NFTA_SET_FIELD_LEN])
3997                 return -EINVAL;
3998
3999         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4000
4001         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4002                 return -E2BIG;
4003
4004         desc->field_len[desc->field_count++] = len;
4005
4006         return 0;
4007 }
4008
4009 static int nft_set_desc_concat(struct nft_set_desc *desc,
4010                                const struct nlattr *nla)
4011 {
4012         struct nlattr *attr;
4013         int rem, err;
4014
4015         nla_for_each_nested(attr, nla, rem) {
4016                 if (nla_type(attr) != NFTA_LIST_ELEM)
4017                         return -EINVAL;
4018
4019                 err = nft_set_desc_concat_parse(attr, desc);
4020                 if (err < 0)
4021                         return err;
4022         }
4023
4024         return 0;
4025 }
4026
4027 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4028                                     const struct nlattr *nla)
4029 {
4030         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4031         int err;
4032
4033         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4034                                           nft_set_desc_policy, NULL);
4035         if (err < 0)
4036                 return err;
4037
4038         if (da[NFTA_SET_DESC_SIZE] != NULL)
4039                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4040         if (da[NFTA_SET_DESC_CONCAT])
4041                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4042
4043         return err;
4044 }
4045
4046 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4047                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4048                             const struct nlattr * const nla[],
4049                             struct netlink_ext_ack *extack)
4050 {
4051         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4052         u8 genmask = nft_genmask_next(net);
4053         int family = nfmsg->nfgen_family;
4054         const struct nft_set_ops *ops;
4055         struct nft_expr *expr = NULL;
4056         struct nft_table *table;
4057         struct nft_set *set;
4058         struct nft_ctx ctx;
4059         char *name;
4060         u64 size;
4061         u64 timeout;
4062         u32 ktype, dtype, flags, policy, gc_int, objtype;
4063         struct nft_set_desc desc;
4064         unsigned char *udata;
4065         u16 udlen;
4066         int err;
4067         int i;
4068
4069         if (nla[NFTA_SET_TABLE] == NULL ||
4070             nla[NFTA_SET_NAME] == NULL ||
4071             nla[NFTA_SET_KEY_LEN] == NULL ||
4072             nla[NFTA_SET_ID] == NULL)
4073                 return -EINVAL;
4074
4075         memset(&desc, 0, sizeof(desc));
4076
4077         ktype = NFT_DATA_VALUE;
4078         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4079                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4080                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4081                         return -EINVAL;
4082         }
4083
4084         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4085         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4086                 return -EINVAL;
4087
4088         flags = 0;
4089         if (nla[NFTA_SET_FLAGS] != NULL) {
4090                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4091                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4092                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4093                               NFT_SET_MAP | NFT_SET_EVAL |
4094                               NFT_SET_OBJECT | NFT_SET_CONCAT))
4095                         return -EOPNOTSUPP;
4096                 /* Only one of these operations is supported */
4097                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4098                              (NFT_SET_MAP | NFT_SET_OBJECT))
4099                         return -EOPNOTSUPP;
4100                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4101                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4102                         return -EOPNOTSUPP;
4103         }
4104
4105         dtype = 0;
4106         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4107                 if (!(flags & NFT_SET_MAP))
4108                         return -EINVAL;
4109
4110                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4111                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4112                     dtype != NFT_DATA_VERDICT)
4113                         return -EINVAL;
4114
4115                 if (dtype != NFT_DATA_VERDICT) {
4116                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4117                                 return -EINVAL;
4118                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4119                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4120                                 return -EINVAL;
4121                 } else
4122                         desc.dlen = sizeof(struct nft_verdict);
4123         } else if (flags & NFT_SET_MAP)
4124                 return -EINVAL;
4125
4126         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4127                 if (!(flags & NFT_SET_OBJECT))
4128                         return -EINVAL;
4129
4130                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4131                 if (objtype == NFT_OBJECT_UNSPEC ||
4132                     objtype > NFT_OBJECT_MAX)
4133                         return -EOPNOTSUPP;
4134         } else if (flags & NFT_SET_OBJECT)
4135                 return -EINVAL;
4136         else
4137                 objtype = NFT_OBJECT_UNSPEC;
4138
4139         timeout = 0;
4140         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4141                 if (!(flags & NFT_SET_TIMEOUT))
4142                         return -EINVAL;
4143
4144                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4145                 if (err)
4146                         return err;
4147         }
4148         gc_int = 0;
4149         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4150                 if (!(flags & NFT_SET_TIMEOUT))
4151                         return -EINVAL;
4152                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4153         }
4154
4155         policy = NFT_SET_POL_PERFORMANCE;
4156         if (nla[NFTA_SET_POLICY] != NULL)
4157                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4158
4159         if (nla[NFTA_SET_DESC] != NULL) {
4160                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4161                 if (err < 0)
4162                         return err;
4163         }
4164
4165         if (nla[NFTA_SET_EXPR])
4166                 desc.expr = true;
4167
4168         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4169         if (IS_ERR(table)) {
4170                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4171                 return PTR_ERR(table);
4172         }
4173
4174         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4175
4176         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4177         if (IS_ERR(set)) {
4178                 if (PTR_ERR(set) != -ENOENT) {
4179                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4180                         return PTR_ERR(set);
4181                 }
4182         } else {
4183                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4184                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4185                         return -EEXIST;
4186                 }
4187                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4188                         return -EOPNOTSUPP;
4189
4190                 return 0;
4191         }
4192
4193         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4194                 return -ENOENT;
4195
4196         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4197         if (IS_ERR(ops))
4198                 return PTR_ERR(ops);
4199
4200         udlen = 0;
4201         if (nla[NFTA_SET_USERDATA])
4202                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4203
4204         size = 0;
4205         if (ops->privsize != NULL)
4206                 size = ops->privsize(nla, &desc);
4207
4208         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4209         if (!set)
4210                 return -ENOMEM;
4211
4212         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4213         if (!name) {
4214                 err = -ENOMEM;
4215                 goto err_set_name;
4216         }
4217
4218         err = nf_tables_set_alloc_name(&ctx, set, name);
4219         kfree(name);
4220         if (err < 0)
4221                 goto err_set_alloc_name;
4222
4223         if (nla[NFTA_SET_EXPR]) {
4224                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4225                 if (IS_ERR(expr)) {
4226                         err = PTR_ERR(expr);
4227                         goto err_set_alloc_name;
4228                 }
4229         }
4230
4231         udata = NULL;
4232         if (udlen) {
4233                 udata = set->data + size;
4234                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4235         }
4236
4237         INIT_LIST_HEAD(&set->bindings);
4238         set->table = table;
4239         write_pnet(&set->net, net);
4240         set->ops   = ops;
4241         set->ktype = ktype;
4242         set->klen  = desc.klen;
4243         set->dtype = dtype;
4244         set->objtype = objtype;
4245         set->dlen  = desc.dlen;
4246         set->expr = expr;
4247         set->flags = flags;
4248         set->size  = desc.size;
4249         set->policy = policy;
4250         set->udlen  = udlen;
4251         set->udata  = udata;
4252         set->timeout = timeout;
4253         set->gc_int = gc_int;
4254         set->handle = nf_tables_alloc_handle(table);
4255
4256         set->field_count = desc.field_count;
4257         for (i = 0; i < desc.field_count; i++)
4258                 set->field_len[i] = desc.field_len[i];
4259
4260         err = ops->init(set, &desc, nla);
4261         if (err < 0)
4262                 goto err_set_init;
4263
4264         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4265         if (err < 0)
4266                 goto err_set_trans;
4267
4268         list_add_tail_rcu(&set->list, &table->sets);
4269         table->use++;
4270         return 0;
4271
4272 err_set_trans:
4273         ops->destroy(set);
4274 err_set_init:
4275         if (expr)
4276                 nft_expr_destroy(&ctx, expr);
4277 err_set_alloc_name:
4278         kfree(set->name);
4279 err_set_name:
4280         kvfree(set);
4281         return err;
4282 }
4283
4284 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4285 {
4286         if (WARN_ON(set->use > 0))
4287                 return;
4288
4289         if (set->expr)
4290                 nft_expr_destroy(ctx, set->expr);
4291
4292         set->ops->destroy(set);
4293         kfree(set->name);
4294         kvfree(set);
4295 }
4296
4297 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4298                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4299                             const struct nlattr * const nla[],
4300                             struct netlink_ext_ack *extack)
4301 {
4302         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4303         u8 genmask = nft_genmask_next(net);
4304         const struct nlattr *attr;
4305         struct nft_set *set;
4306         struct nft_ctx ctx;
4307         int err;
4308
4309         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4310                 return -EAFNOSUPPORT;
4311         if (nla[NFTA_SET_TABLE] == NULL)
4312                 return -EINVAL;
4313
4314         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4315                                         genmask);
4316         if (err < 0)
4317                 return err;
4318
4319         if (nla[NFTA_SET_HANDLE]) {
4320                 attr = nla[NFTA_SET_HANDLE];
4321                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4322         } else {
4323                 attr = nla[NFTA_SET_NAME];
4324                 set = nft_set_lookup(ctx.table, attr, genmask);
4325         }
4326
4327         if (IS_ERR(set)) {
4328                 NL_SET_BAD_ATTR(extack, attr);
4329                 return PTR_ERR(set);
4330         }
4331         if (set->use ||
4332             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4333                 NL_SET_BAD_ATTR(extack, attr);
4334                 return -EBUSY;
4335         }
4336
4337         return nft_delset(&ctx, set);
4338 }
4339
4340 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4341                                         struct nft_set *set,
4342                                         const struct nft_set_iter *iter,
4343                                         struct nft_set_elem *elem)
4344 {
4345         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4346         enum nft_registers dreg;
4347
4348         dreg = nft_type_to_reg(set->dtype);
4349         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4350                                            set->dtype == NFT_DATA_VERDICT ?
4351                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4352                                            set->dlen);
4353 }
4354
4355 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4356                        struct nft_set_binding *binding)
4357 {
4358         struct nft_set_binding *i;
4359         struct nft_set_iter iter;
4360
4361         if (set->use == UINT_MAX)
4362                 return -EOVERFLOW;
4363
4364         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4365                 return -EBUSY;
4366
4367         if (binding->flags & NFT_SET_MAP) {
4368                 /* If the set is already bound to the same chain all
4369                  * jumps are already validated for that chain.
4370                  */
4371                 list_for_each_entry(i, &set->bindings, list) {
4372                         if (i->flags & NFT_SET_MAP &&
4373                             i->chain == binding->chain)
4374                                 goto bind;
4375                 }
4376
4377                 iter.genmask    = nft_genmask_next(ctx->net);
4378                 iter.skip       = 0;
4379                 iter.count      = 0;
4380                 iter.err        = 0;
4381                 iter.fn         = nf_tables_bind_check_setelem;
4382
4383                 set->ops->walk(ctx, set, &iter);
4384                 if (iter.err < 0)
4385                         return iter.err;
4386         }
4387 bind:
4388         binding->chain = ctx->chain;
4389         list_add_tail_rcu(&binding->list, &set->bindings);
4390         nft_set_trans_bind(ctx, set);
4391         set->use++;
4392
4393         return 0;
4394 }
4395 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4396
4397 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4398                                  struct nft_set_binding *binding, bool event)
4399 {
4400         list_del_rcu(&binding->list);
4401
4402         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4403                 list_del_rcu(&set->list);
4404                 if (event)
4405                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4406                                              GFP_KERNEL);
4407         }
4408 }
4409
4410 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4411                               struct nft_set_binding *binding,
4412                               enum nft_trans_phase phase)
4413 {
4414         switch (phase) {
4415         case NFT_TRANS_PREPARE:
4416                 set->use--;
4417                 return;
4418         case NFT_TRANS_ABORT:
4419         case NFT_TRANS_RELEASE:
4420                 set->use--;
4421                 fallthrough;
4422         default:
4423                 nf_tables_unbind_set(ctx, set, binding,
4424                                      phase == NFT_TRANS_COMMIT);
4425         }
4426 }
4427 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4428
4429 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4430 {
4431         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4432                 nft_set_destroy(ctx, set);
4433 }
4434 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4435
4436 const struct nft_set_ext_type nft_set_ext_types[] = {
4437         [NFT_SET_EXT_KEY]               = {
4438                 .align  = __alignof__(u32),
4439         },
4440         [NFT_SET_EXT_DATA]              = {
4441                 .align  = __alignof__(u32),
4442         },
4443         [NFT_SET_EXT_EXPR]              = {
4444                 .align  = __alignof__(struct nft_expr),
4445         },
4446         [NFT_SET_EXT_OBJREF]            = {
4447                 .len    = sizeof(struct nft_object *),
4448                 .align  = __alignof__(struct nft_object *),
4449         },
4450         [NFT_SET_EXT_FLAGS]             = {
4451                 .len    = sizeof(u8),
4452                 .align  = __alignof__(u8),
4453         },
4454         [NFT_SET_EXT_TIMEOUT]           = {
4455                 .len    = sizeof(u64),
4456                 .align  = __alignof__(u64),
4457         },
4458         [NFT_SET_EXT_EXPIRATION]        = {
4459                 .len    = sizeof(u64),
4460                 .align  = __alignof__(u64),
4461         },
4462         [NFT_SET_EXT_USERDATA]          = {
4463                 .len    = sizeof(struct nft_userdata),
4464                 .align  = __alignof__(struct nft_userdata),
4465         },
4466         [NFT_SET_EXT_KEY_END]           = {
4467                 .align  = __alignof__(u32),
4468         },
4469 };
4470
4471 /*
4472  * Set elements
4473  */
4474
4475 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4476         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4477         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4478         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4479         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4480         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4481         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4482                                             .len = NFT_USERDATA_MAXLEN },
4483         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4484         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4485                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4486         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4487 };
4488
4489 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4490         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4491                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4492         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4493                                             .len = NFT_SET_MAXNAMELEN - 1 },
4494         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4495         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4496 };
4497
4498 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4499                                       const struct sk_buff *skb,
4500                                       const struct nlmsghdr *nlh,
4501                                       const struct nlattr * const nla[],
4502                                       struct netlink_ext_ack *extack,
4503                                       u8 genmask)
4504 {
4505         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4506         int family = nfmsg->nfgen_family;
4507         struct nft_table *table;
4508
4509         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4510                                  genmask);
4511         if (IS_ERR(table)) {
4512                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4513                 return PTR_ERR(table);
4514         }
4515
4516         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4517         return 0;
4518 }
4519
4520 static int nf_tables_fill_setelem(struct sk_buff *skb,
4521                                   const struct nft_set *set,
4522                                   const struct nft_set_elem *elem)
4523 {
4524         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4525         unsigned char *b = skb_tail_pointer(skb);
4526         struct nlattr *nest;
4527
4528         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4529         if (nest == NULL)
4530                 goto nla_put_failure;
4531
4532         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4533                           NFT_DATA_VALUE, set->klen) < 0)
4534                 goto nla_put_failure;
4535
4536         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4537             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4538                           NFT_DATA_VALUE, set->klen) < 0)
4539                 goto nla_put_failure;
4540
4541         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4542             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4543                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4544                           set->dlen) < 0)
4545                 goto nla_put_failure;
4546
4547         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4548             nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4549                 goto nla_put_failure;
4550
4551         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4552             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4553                            (*nft_set_ext_obj(ext))->key.name) < 0)
4554                 goto nla_put_failure;
4555
4556         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4557             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4558                          htonl(*nft_set_ext_flags(ext))))
4559                 goto nla_put_failure;
4560
4561         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4562             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4563                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4564                          NFTA_SET_ELEM_PAD))
4565                 goto nla_put_failure;
4566
4567         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4568                 u64 expires, now = get_jiffies_64();
4569
4570                 expires = *nft_set_ext_expiration(ext);
4571                 if (time_before64(now, expires))
4572                         expires -= now;
4573                 else
4574                         expires = 0;
4575
4576                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4577                                  nf_jiffies64_to_msecs(expires),
4578                                  NFTA_SET_ELEM_PAD))
4579                         goto nla_put_failure;
4580         }
4581
4582         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4583                 struct nft_userdata *udata;
4584
4585                 udata = nft_set_ext_userdata(ext);
4586                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4587                             udata->len + 1, udata->data))
4588                         goto nla_put_failure;
4589         }
4590
4591         nla_nest_end(skb, nest);
4592         return 0;
4593
4594 nla_put_failure:
4595         nlmsg_trim(skb, b);
4596         return -EMSGSIZE;
4597 }
4598
4599 struct nft_set_dump_args {
4600         const struct netlink_callback   *cb;
4601         struct nft_set_iter             iter;
4602         struct sk_buff                  *skb;
4603 };
4604
4605 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4606                                   struct nft_set *set,
4607                                   const struct nft_set_iter *iter,
4608                                   struct nft_set_elem *elem)
4609 {
4610         struct nft_set_dump_args *args;
4611
4612         args = container_of(iter, struct nft_set_dump_args, iter);
4613         return nf_tables_fill_setelem(args->skb, set, elem);
4614 }
4615
4616 struct nft_set_dump_ctx {
4617         const struct nft_set    *set;
4618         struct nft_ctx          ctx;
4619 };
4620
4621 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4622 {
4623         struct nft_set_dump_ctx *dump_ctx = cb->data;
4624         struct net *net = sock_net(skb->sk);
4625         struct nft_table *table;
4626         struct nft_set *set;
4627         struct nft_set_dump_args args;
4628         bool set_found = false;
4629         struct nfgenmsg *nfmsg;
4630         struct nlmsghdr *nlh;
4631         struct nlattr *nest;
4632         u32 portid, seq;
4633         int event;
4634
4635         rcu_read_lock();
4636         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4637                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4638                     dump_ctx->ctx.family != table->family)
4639                         continue;
4640
4641                 if (table != dump_ctx->ctx.table)
4642                         continue;
4643
4644                 list_for_each_entry_rcu(set, &table->sets, list) {
4645                         if (set == dump_ctx->set) {
4646                                 set_found = true;
4647                                 break;
4648                         }
4649                 }
4650                 break;
4651         }
4652
4653         if (!set_found) {
4654                 rcu_read_unlock();
4655                 return -ENOENT;
4656         }
4657
4658         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4659         portid = NETLINK_CB(cb->skb).portid;
4660         seq    = cb->nlh->nlmsg_seq;
4661
4662         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4663                         NLM_F_MULTI);
4664         if (nlh == NULL)
4665                 goto nla_put_failure;
4666
4667         nfmsg = nlmsg_data(nlh);
4668         nfmsg->nfgen_family = table->family;
4669         nfmsg->version      = NFNETLINK_V0;
4670         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4671
4672         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4673                 goto nla_put_failure;
4674         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4675                 goto nla_put_failure;
4676
4677         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4678         if (nest == NULL)
4679                 goto nla_put_failure;
4680
4681         args.cb                 = cb;
4682         args.skb                = skb;
4683         args.iter.genmask       = nft_genmask_cur(net);
4684         args.iter.skip          = cb->args[0];
4685         args.iter.count         = 0;
4686         args.iter.err           = 0;
4687         args.iter.fn            = nf_tables_dump_setelem;
4688         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4689         rcu_read_unlock();
4690
4691         nla_nest_end(skb, nest);
4692         nlmsg_end(skb, nlh);
4693
4694         if (args.iter.err && args.iter.err != -EMSGSIZE)
4695                 return args.iter.err;
4696         if (args.iter.count == cb->args[0])
4697                 return 0;
4698
4699         cb->args[0] = args.iter.count;
4700         return skb->len;
4701
4702 nla_put_failure:
4703         rcu_read_unlock();
4704         return -ENOSPC;
4705 }
4706
4707 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4708 {
4709         struct nft_set_dump_ctx *dump_ctx = cb->data;
4710
4711         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4712
4713         return cb->data ? 0 : -ENOMEM;
4714 }
4715
4716 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4717 {
4718         kfree(cb->data);
4719         return 0;
4720 }
4721
4722 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4723                                        const struct nft_ctx *ctx, u32 seq,
4724                                        u32 portid, int event, u16 flags,
4725                                        const struct nft_set *set,
4726                                        const struct nft_set_elem *elem)
4727 {
4728         struct nfgenmsg *nfmsg;
4729         struct nlmsghdr *nlh;
4730         struct nlattr *nest;
4731         int err;
4732
4733         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4734         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4735                         flags);
4736         if (nlh == NULL)
4737                 goto nla_put_failure;
4738
4739         nfmsg = nlmsg_data(nlh);
4740         nfmsg->nfgen_family     = ctx->family;
4741         nfmsg->version          = NFNETLINK_V0;
4742         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4743
4744         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4745                 goto nla_put_failure;
4746         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4747                 goto nla_put_failure;
4748
4749         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4750         if (nest == NULL)
4751                 goto nla_put_failure;
4752
4753         err = nf_tables_fill_setelem(skb, set, elem);
4754         if (err < 0)
4755                 goto nla_put_failure;
4756
4757         nla_nest_end(skb, nest);
4758
4759         nlmsg_end(skb, nlh);
4760         return 0;
4761
4762 nla_put_failure:
4763         nlmsg_trim(skb, nlh);
4764         return -1;
4765 }
4766
4767 static int nft_setelem_parse_flags(const struct nft_set *set,
4768                                    const struct nlattr *attr, u32 *flags)
4769 {
4770         if (attr == NULL)
4771                 return 0;
4772
4773         *flags = ntohl(nla_get_be32(attr));
4774         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4775                 return -EINVAL;
4776         if (!(set->flags & NFT_SET_INTERVAL) &&
4777             *flags & NFT_SET_ELEM_INTERVAL_END)
4778                 return -EINVAL;
4779
4780         return 0;
4781 }
4782
4783 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4784                                  struct nft_data *key, struct nlattr *attr)
4785 {
4786         struct nft_data_desc desc;
4787         int err;
4788
4789         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4790         if (err < 0)
4791                 return err;
4792
4793         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4794                 nft_data_release(key, desc.type);
4795                 return -EINVAL;
4796         }
4797
4798         return 0;
4799 }
4800
4801 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4802                                   struct nft_data_desc *desc,
4803                                   struct nft_data *data,
4804                                   struct nlattr *attr)
4805 {
4806         int err;
4807
4808         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4809         if (err < 0)
4810                 return err;
4811
4812         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4813                 nft_data_release(data, desc->type);
4814                 return -EINVAL;
4815         }
4816
4817         return 0;
4818 }
4819
4820 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4821                             const struct nlattr *attr)
4822 {
4823         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4824         struct nft_set_elem elem;
4825         struct sk_buff *skb;
4826         uint32_t flags = 0;
4827         void *priv;
4828         int err;
4829
4830         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4831                                           nft_set_elem_policy, NULL);
4832         if (err < 0)
4833                 return err;
4834
4835         if (!nla[NFTA_SET_ELEM_KEY])
4836                 return -EINVAL;
4837
4838         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4839         if (err < 0)
4840                 return err;
4841
4842         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4843                                     nla[NFTA_SET_ELEM_KEY]);
4844         if (err < 0)
4845                 return err;
4846
4847         if (nla[NFTA_SET_ELEM_KEY_END]) {
4848                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4849                                             nla[NFTA_SET_ELEM_KEY_END]);
4850                 if (err < 0)
4851                         return err;
4852         }
4853
4854         priv = set->ops->get(ctx->net, set, &elem, flags);
4855         if (IS_ERR(priv))
4856                 return PTR_ERR(priv);
4857
4858         elem.priv = priv;
4859
4860         err = -ENOMEM;
4861         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4862         if (skb == NULL)
4863                 return err;
4864
4865         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4866                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
4867         if (err < 0)
4868                 goto err_fill_setelem;
4869
4870         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4871
4872 err_fill_setelem:
4873         kfree_skb(skb);
4874         return err;
4875 }
4876
4877 /* called with rcu_read_lock held */
4878 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4879                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
4880                                 const struct nlattr * const nla[],
4881                                 struct netlink_ext_ack *extack)
4882 {
4883         u8 genmask = nft_genmask_cur(net);
4884         struct nft_set *set;
4885         struct nlattr *attr;
4886         struct nft_ctx ctx;
4887         int rem, err = 0;
4888
4889         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4890                                          genmask);
4891         if (err < 0)
4892                 return err;
4893
4894         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4895         if (IS_ERR(set))
4896                 return PTR_ERR(set);
4897
4898         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4899                 struct netlink_dump_control c = {
4900                         .start = nf_tables_dump_set_start,
4901                         .dump = nf_tables_dump_set,
4902                         .done = nf_tables_dump_set_done,
4903                         .module = THIS_MODULE,
4904                 };
4905                 struct nft_set_dump_ctx dump_ctx = {
4906                         .set = set,
4907                         .ctx = ctx,
4908                 };
4909
4910                 c.data = &dump_ctx;
4911                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4912         }
4913
4914         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4915                 return -EINVAL;
4916
4917         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4918                 err = nft_get_set_elem(&ctx, set, attr);
4919                 if (err < 0)
4920                         break;
4921         }
4922
4923         return err;
4924 }
4925
4926 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4927                                      const struct nft_set *set,
4928                                      const struct nft_set_elem *elem,
4929                                      int event, u16 flags)
4930 {
4931         struct net *net = ctx->net;
4932         u32 portid = ctx->portid;
4933         struct sk_buff *skb;
4934         int err;
4935         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
4936                               ctx->table->name, ctx->table->handle,
4937                               set->name, set->handle);
4938
4939         audit_log_nfcfg(buf,
4940                         ctx->family,
4941                         set->handle,
4942                         event == NFT_MSG_NEWSETELEM ?
4943                                 AUDIT_NFT_OP_SETELEM_REGISTER :
4944                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
4945                         GFP_KERNEL);
4946         kfree(buf);
4947
4948         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
4949                 return;
4950
4951         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
4952         if (skb == NULL)
4953                 goto err;
4954
4955         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
4956                                           set, elem);
4957         if (err < 0) {
4958                 kfree_skb(skb);
4959                 goto err;
4960         }
4961
4962         nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, ctx->report,
4963                        GFP_KERNEL);
4964         return;
4965 err:
4966         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4967 }
4968
4969 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
4970                                               int msg_type,
4971                                               struct nft_set *set)
4972 {
4973         struct nft_trans *trans;
4974
4975         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
4976         if (trans == NULL)
4977                 return NULL;
4978
4979         nft_trans_elem_set(trans) = set;
4980         return trans;
4981 }
4982
4983 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
4984                                          const struct nft_set *set,
4985                                          const struct nlattr *attr)
4986 {
4987         struct nft_expr *expr;
4988         int err;
4989
4990         expr = nft_expr_init(ctx, attr);
4991         if (IS_ERR(expr))
4992                 return expr;
4993
4994         err = -EOPNOTSUPP;
4995         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
4996                 goto err_set_elem_expr;
4997
4998         if (expr->ops->type->flags & NFT_EXPR_GC) {
4999                 if (set->flags & NFT_SET_TIMEOUT)
5000                         goto err_set_elem_expr;
5001                 if (!set->ops->gc_init)
5002                         goto err_set_elem_expr;
5003                 set->ops->gc_init(set);
5004         }
5005
5006         return expr;
5007
5008 err_set_elem_expr:
5009         nft_expr_destroy(ctx, expr);
5010         return ERR_PTR(err);
5011 }
5012
5013 void *nft_set_elem_init(const struct nft_set *set,
5014                         const struct nft_set_ext_tmpl *tmpl,
5015                         const u32 *key, const u32 *key_end,
5016                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5017 {
5018         struct nft_set_ext *ext;
5019         void *elem;
5020
5021         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5022         if (elem == NULL)
5023                 return NULL;
5024
5025         ext = nft_set_elem_ext(set, elem);
5026         nft_set_ext_init(ext, tmpl);
5027
5028         memcpy(nft_set_ext_key(ext), key, set->klen);
5029         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5030                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5031         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5032                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5033         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5034                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5035                 if (expiration == 0)
5036                         *nft_set_ext_expiration(ext) += timeout;
5037         }
5038         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5039                 *nft_set_ext_timeout(ext) = timeout;
5040
5041         return elem;
5042 }
5043
5044 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5045                                       struct nft_expr *expr)
5046 {
5047         if (expr->ops->destroy_clone) {
5048                 expr->ops->destroy_clone(ctx, expr);
5049                 module_put(expr->ops->type->owner);
5050         } else {
5051                 nf_tables_expr_destroy(ctx, expr);
5052         }
5053 }
5054
5055 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5056                           bool destroy_expr)
5057 {
5058         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5059         struct nft_ctx ctx = {
5060                 .net    = read_pnet(&set->net),
5061                 .family = set->table->family,
5062         };
5063
5064         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5065         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5066                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5067         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5068                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5069
5070         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5071                 (*nft_set_ext_obj(ext))->use--;
5072         kfree(elem);
5073 }
5074 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5075
5076 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5077  * the refcounting from the preparation phase.
5078  */
5079 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5080                                        const struct nft_set *set, void *elem)
5081 {
5082         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5083
5084         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5085                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5086
5087         kfree(elem);
5088 }
5089
5090 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5091                             const struct nlattr *attr, u32 nlmsg_flags)
5092 {
5093         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5094         u8 genmask = nft_genmask_next(ctx->net);
5095         struct nft_set_ext_tmpl tmpl;
5096         struct nft_set_ext *ext, *ext2;
5097         struct nft_set_elem elem;
5098         struct nft_set_binding *binding;
5099         struct nft_object *obj = NULL;
5100         struct nft_expr *expr = NULL;
5101         struct nft_userdata *udata;
5102         struct nft_data_desc desc;
5103         enum nft_registers dreg;
5104         struct nft_trans *trans;
5105         u32 flags = 0;
5106         u64 timeout;
5107         u64 expiration;
5108         u8 ulen;
5109         int err;
5110
5111         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5112                                           nft_set_elem_policy, NULL);
5113         if (err < 0)
5114                 return err;
5115
5116         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5117                 return -EINVAL;
5118
5119         nft_set_ext_prepare(&tmpl);
5120
5121         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5122         if (err < 0)
5123                 return err;
5124         if (flags != 0)
5125                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5126
5127         if (set->flags & NFT_SET_MAP) {
5128                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5129                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5130                         return -EINVAL;
5131         } else {
5132                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5133                         return -EINVAL;
5134         }
5135
5136         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5137              (nla[NFTA_SET_ELEM_DATA] ||
5138               nla[NFTA_SET_ELEM_OBJREF] ||
5139               nla[NFTA_SET_ELEM_TIMEOUT] ||
5140               nla[NFTA_SET_ELEM_EXPIRATION] ||
5141               nla[NFTA_SET_ELEM_USERDATA] ||
5142               nla[NFTA_SET_ELEM_EXPR]))
5143                 return -EINVAL;
5144
5145         timeout = 0;
5146         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5147                 if (!(set->flags & NFT_SET_TIMEOUT))
5148                         return -EINVAL;
5149                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5150                                             &timeout);
5151                 if (err)
5152                         return err;
5153         } else if (set->flags & NFT_SET_TIMEOUT) {
5154                 timeout = set->timeout;
5155         }
5156
5157         expiration = 0;
5158         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5159                 if (!(set->flags & NFT_SET_TIMEOUT))
5160                         return -EINVAL;
5161                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5162                                             &expiration);
5163                 if (err)
5164                         return err;
5165         }
5166
5167         if (nla[NFTA_SET_ELEM_EXPR] != NULL) {
5168                 expr = nft_set_elem_expr_alloc(ctx, set,
5169                                                nla[NFTA_SET_ELEM_EXPR]);
5170                 if (IS_ERR(expr))
5171                         return PTR_ERR(expr);
5172
5173                 err = -EOPNOTSUPP;
5174                 if (set->expr && set->expr->ops != expr->ops)
5175                         goto err_set_elem_expr;
5176         } else if (set->expr) {
5177                 expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
5178                 if (!expr)
5179                         return -ENOMEM;
5180
5181                 err = nft_expr_clone(expr, set->expr);
5182                 if (err < 0)
5183                         goto err_set_elem_expr;
5184         }
5185
5186         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5187                                     nla[NFTA_SET_ELEM_KEY]);
5188         if (err < 0)
5189                 goto err_set_elem_expr;
5190
5191         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5192
5193         if (nla[NFTA_SET_ELEM_KEY_END]) {
5194                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5195                                             nla[NFTA_SET_ELEM_KEY_END]);
5196                 if (err < 0)
5197                         goto err_parse_key;
5198
5199                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5200         }
5201
5202         if (timeout > 0) {
5203                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5204                 if (timeout != set->timeout)
5205                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5206         }
5207
5208         if (expr)
5209                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
5210                                        expr->ops->size);
5211
5212         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5213                 if (!(set->flags & NFT_SET_OBJECT)) {
5214                         err = -EINVAL;
5215                         goto err_parse_key_end;
5216                 }
5217                 obj = nft_obj_lookup(ctx->net, ctx->table,
5218                                      nla[NFTA_SET_ELEM_OBJREF],
5219                                      set->objtype, genmask);
5220                 if (IS_ERR(obj)) {
5221                         err = PTR_ERR(obj);
5222                         goto err_parse_key_end;
5223                 }
5224                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5225         }
5226
5227         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5228                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5229                                              nla[NFTA_SET_ELEM_DATA]);
5230                 if (err < 0)
5231                         goto err_parse_key_end;
5232
5233                 dreg = nft_type_to_reg(set->dtype);
5234                 list_for_each_entry(binding, &set->bindings, list) {
5235                         struct nft_ctx bind_ctx = {
5236                                 .net    = ctx->net,
5237                                 .family = ctx->family,
5238                                 .table  = ctx->table,
5239                                 .chain  = (struct nft_chain *)binding->chain,
5240                         };
5241
5242                         if (!(binding->flags & NFT_SET_MAP))
5243                                 continue;
5244
5245                         err = nft_validate_register_store(&bind_ctx, dreg,
5246                                                           &elem.data.val,
5247                                                           desc.type, desc.len);
5248                         if (err < 0)
5249                                 goto err_parse_data;
5250
5251                         if (desc.type == NFT_DATA_VERDICT &&
5252                             (elem.data.val.verdict.code == NFT_GOTO ||
5253                              elem.data.val.verdict.code == NFT_JUMP))
5254                                 nft_validate_state_update(ctx->net,
5255                                                           NFT_VALIDATE_NEED);
5256                 }
5257
5258                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5259         }
5260
5261         /* The full maximum length of userdata can exceed the maximum
5262          * offset value (U8_MAX) for following extensions, therefor it
5263          * must be the last extension added.
5264          */
5265         ulen = 0;
5266         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5267                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5268                 if (ulen > 0)
5269                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5270                                                ulen);
5271         }
5272
5273         err = -ENOMEM;
5274         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5275                                       elem.key_end.val.data, elem.data.val.data,
5276                                       timeout, expiration, GFP_KERNEL);
5277         if (elem.priv == NULL)
5278                 goto err_parse_data;
5279
5280         ext = nft_set_elem_ext(set, elem.priv);
5281         if (flags)
5282                 *nft_set_ext_flags(ext) = flags;
5283         if (ulen > 0) {
5284                 udata = nft_set_ext_userdata(ext);
5285                 udata->len = ulen - 1;
5286                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5287         }
5288         if (obj) {
5289                 *nft_set_ext_obj(ext) = obj;
5290                 obj->use++;
5291         }
5292         if (expr) {
5293                 memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
5294                 kfree(expr);
5295                 expr = NULL;
5296         }
5297
5298         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5299         if (trans == NULL)
5300                 goto err_trans;
5301
5302         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5303         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5304         if (err) {
5305                 if (err == -EEXIST) {
5306                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5307                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5308                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5309                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5310                                 goto err_element_clash;
5311                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5312                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5313                              memcmp(nft_set_ext_data(ext),
5314                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5315                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5316                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5317                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5318                                 goto err_element_clash;
5319                         else if (!(nlmsg_flags & NLM_F_EXCL))
5320                                 err = 0;
5321                 } else if (err == -ENOTEMPTY) {
5322                         /* ENOTEMPTY reports overlapping between this element
5323                          * and an existing one.
5324                          */
5325                         err = -EEXIST;
5326                 }
5327                 goto err_element_clash;
5328         }
5329
5330         if (set->size &&
5331             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5332                 err = -ENFILE;
5333                 goto err_set_full;
5334         }
5335
5336         nft_trans_elem(trans) = elem;
5337         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5338         return 0;
5339
5340 err_set_full:
5341         set->ops->remove(ctx->net, set, &elem);
5342 err_element_clash:
5343         kfree(trans);
5344 err_trans:
5345         if (obj)
5346                 obj->use--;
5347
5348         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5349 err_parse_data:
5350         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5351                 nft_data_release(&elem.data.val, desc.type);
5352 err_parse_key_end:
5353         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5354 err_parse_key:
5355         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5356 err_set_elem_expr:
5357         if (expr != NULL)
5358                 nft_expr_destroy(ctx, expr);
5359
5360         return err;
5361 }
5362
5363 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5364                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5365                                 const struct nlattr * const nla[],
5366                                 struct netlink_ext_ack *extack)
5367 {
5368         u8 genmask = nft_genmask_next(net);
5369         const struct nlattr *attr;
5370         struct nft_set *set;
5371         struct nft_ctx ctx;
5372         int rem, err;
5373
5374         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5375                 return -EINVAL;
5376
5377         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5378                                          genmask);
5379         if (err < 0)
5380                 return err;
5381
5382         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5383                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5384         if (IS_ERR(set))
5385                 return PTR_ERR(set);
5386
5387         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5388                 return -EBUSY;
5389
5390         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5391                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5392                 if (err < 0)
5393                         return err;
5394         }
5395
5396         if (net->nft.validate_state == NFT_VALIDATE_DO)
5397                 return nft_table_validate(net, ctx.table);
5398
5399         return 0;
5400 }
5401
5402 /**
5403  *      nft_data_hold - hold a nft_data item
5404  *
5405  *      @data: struct nft_data to release
5406  *      @type: type of data
5407  *
5408  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5409  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5410  *      NFT_GOTO verdicts. This function must be called on active data objects
5411  *      from the second phase of the commit protocol.
5412  */
5413 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5414 {
5415         struct nft_chain *chain;
5416         struct nft_rule *rule;
5417
5418         if (type == NFT_DATA_VERDICT) {
5419                 switch (data->verdict.code) {
5420                 case NFT_JUMP:
5421                 case NFT_GOTO:
5422                         chain = data->verdict.chain;
5423                         chain->use++;
5424
5425                         if (!nft_chain_is_bound(chain))
5426                                 break;
5427
5428                         chain->table->use++;
5429                         list_for_each_entry(rule, &chain->rules, list)
5430                                 chain->use++;
5431
5432                         nft_chain_add(chain->table, chain);
5433                         break;
5434                 }
5435         }
5436 }
5437
5438 static void nft_set_elem_activate(const struct net *net,
5439                                   const struct nft_set *set,
5440                                   struct nft_set_elem *elem)
5441 {
5442         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5443
5444         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5445                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5446         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5447                 (*nft_set_ext_obj(ext))->use++;
5448 }
5449
5450 static void nft_set_elem_deactivate(const struct net *net,
5451                                     const struct nft_set *set,
5452                                     struct nft_set_elem *elem)
5453 {
5454         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5455
5456         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5457                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5458         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5459                 (*nft_set_ext_obj(ext))->use--;
5460 }
5461
5462 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5463                            const struct nlattr *attr)
5464 {
5465         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5466         struct nft_set_ext_tmpl tmpl;
5467         struct nft_set_elem elem;
5468         struct nft_set_ext *ext;
5469         struct nft_trans *trans;
5470         u32 flags = 0;
5471         void *priv;
5472         int err;
5473
5474         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5475                                           nft_set_elem_policy, NULL);
5476         if (err < 0)
5477                 return err;
5478
5479         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5480                 return -EINVAL;
5481
5482         nft_set_ext_prepare(&tmpl);
5483
5484         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5485         if (err < 0)
5486                 return err;
5487         if (flags != 0)
5488                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5489
5490         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5491                                     nla[NFTA_SET_ELEM_KEY]);
5492         if (err < 0)
5493                 return err;
5494
5495         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5496
5497         if (nla[NFTA_SET_ELEM_KEY_END]) {
5498                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5499                                             nla[NFTA_SET_ELEM_KEY_END]);
5500                 if (err < 0)
5501                         return err;
5502
5503                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5504         }
5505
5506         err = -ENOMEM;
5507         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5508                                       elem.key_end.val.data, NULL, 0, 0,
5509                                       GFP_KERNEL);
5510         if (elem.priv == NULL)
5511                 goto fail_elem;
5512
5513         ext = nft_set_elem_ext(set, elem.priv);
5514         if (flags)
5515                 *nft_set_ext_flags(ext) = flags;
5516
5517         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5518         if (trans == NULL)
5519                 goto fail_trans;
5520
5521         priv = set->ops->deactivate(ctx->net, set, &elem);
5522         if (priv == NULL) {
5523                 err = -ENOENT;
5524                 goto fail_ops;
5525         }
5526         kfree(elem.priv);
5527         elem.priv = priv;
5528
5529         nft_set_elem_deactivate(ctx->net, set, &elem);
5530
5531         nft_trans_elem(trans) = elem;
5532         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5533         return 0;
5534
5535 fail_ops:
5536         kfree(trans);
5537 fail_trans:
5538         kfree(elem.priv);
5539 fail_elem:
5540         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5541         return err;
5542 }
5543
5544 static int nft_flush_set(const struct nft_ctx *ctx,
5545                          struct nft_set *set,
5546                          const struct nft_set_iter *iter,
5547                          struct nft_set_elem *elem)
5548 {
5549         struct nft_trans *trans;
5550         int err;
5551
5552         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5553                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5554         if (!trans)
5555                 return -ENOMEM;
5556
5557         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5558                 err = -ENOENT;
5559                 goto err1;
5560         }
5561         set->ndeact++;
5562
5563         nft_set_elem_deactivate(ctx->net, set, elem);
5564         nft_trans_elem_set(trans) = set;
5565         nft_trans_elem(trans) = *elem;
5566         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5567
5568         return 0;
5569 err1:
5570         kfree(trans);
5571         return err;
5572 }
5573
5574 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5575                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5576                                 const struct nlattr * const nla[],
5577                                 struct netlink_ext_ack *extack)
5578 {
5579         u8 genmask = nft_genmask_next(net);
5580         const struct nlattr *attr;
5581         struct nft_set *set;
5582         struct nft_ctx ctx;
5583         int rem, err = 0;
5584
5585         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5586                                          genmask);
5587         if (err < 0)
5588                 return err;
5589
5590         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5591         if (IS_ERR(set))
5592                 return PTR_ERR(set);
5593         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5594                 return -EBUSY;
5595
5596         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5597                 struct nft_set_iter iter = {
5598                         .genmask        = genmask,
5599                         .fn             = nft_flush_set,
5600                 };
5601                 set->ops->walk(&ctx, set, &iter);
5602
5603                 return iter.err;
5604         }
5605
5606         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5607                 err = nft_del_setelem(&ctx, set, attr);
5608                 if (err < 0)
5609                         break;
5610
5611                 set->ndeact++;
5612         }
5613         return err;
5614 }
5615
5616 void nft_set_gc_batch_release(struct rcu_head *rcu)
5617 {
5618         struct nft_set_gc_batch *gcb;
5619         unsigned int i;
5620
5621         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5622         for (i = 0; i < gcb->head.cnt; i++)
5623                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5624         kfree(gcb);
5625 }
5626
5627 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5628                                                 gfp_t gfp)
5629 {
5630         struct nft_set_gc_batch *gcb;
5631
5632         gcb = kzalloc(sizeof(*gcb), gfp);
5633         if (gcb == NULL)
5634                 return gcb;
5635         gcb->head.set = set;
5636         return gcb;
5637 }
5638
5639 /*
5640  * Stateful objects
5641  */
5642
5643 /**
5644  *      nft_register_obj- register nf_tables stateful object type
5645  *      @obj_type: object type
5646  *
5647  *      Registers the object type for use with nf_tables. Returns zero on
5648  *      success or a negative errno code otherwise.
5649  */
5650 int nft_register_obj(struct nft_object_type *obj_type)
5651 {
5652         if (obj_type->type == NFT_OBJECT_UNSPEC)
5653                 return -EINVAL;
5654
5655         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5656         list_add_rcu(&obj_type->list, &nf_tables_objects);
5657         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5658         return 0;
5659 }
5660 EXPORT_SYMBOL_GPL(nft_register_obj);
5661
5662 /**
5663  *      nft_unregister_obj - unregister nf_tables object type
5664  *      @obj_type: object type
5665  *
5666  *      Unregisters the object type for use with nf_tables.
5667  */
5668 void nft_unregister_obj(struct nft_object_type *obj_type)
5669 {
5670         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5671         list_del_rcu(&obj_type->list);
5672         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5673 }
5674 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5675
5676 struct nft_object *nft_obj_lookup(const struct net *net,
5677                                   const struct nft_table *table,
5678                                   const struct nlattr *nla, u32 objtype,
5679                                   u8 genmask)
5680 {
5681         struct nft_object_hash_key k = { .table = table };
5682         char search[NFT_OBJ_MAXNAMELEN];
5683         struct rhlist_head *tmp, *list;
5684         struct nft_object *obj;
5685
5686         nla_strlcpy(search, nla, sizeof(search));
5687         k.name = search;
5688
5689         WARN_ON_ONCE(!rcu_read_lock_held() &&
5690                      !lockdep_commit_lock_is_held(net));
5691
5692         rcu_read_lock();
5693         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5694         if (!list)
5695                 goto out;
5696
5697         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5698                 if (objtype == obj->ops->type->type &&
5699                     nft_active_genmask(obj, genmask)) {
5700                         rcu_read_unlock();
5701                         return obj;
5702                 }
5703         }
5704 out:
5705         rcu_read_unlock();
5706         return ERR_PTR(-ENOENT);
5707 }
5708 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5709
5710 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5711                                                   const struct nlattr *nla,
5712                                                   u32 objtype, u8 genmask)
5713 {
5714         struct nft_object *obj;
5715
5716         list_for_each_entry(obj, &table->objects, list) {
5717                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5718                     objtype == obj->ops->type->type &&
5719                     nft_active_genmask(obj, genmask))
5720                         return obj;
5721         }
5722         return ERR_PTR(-ENOENT);
5723 }
5724
5725 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5726         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5727                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5728         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5729                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5730         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5731         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5732         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5733 };
5734
5735 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5736                                        const struct nft_object_type *type,
5737                                        const struct nlattr *attr)
5738 {
5739         struct nlattr **tb;
5740         const struct nft_object_ops *ops;
5741         struct nft_object *obj;
5742         int err = -ENOMEM;
5743
5744         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5745         if (!tb)
5746                 goto err1;
5747
5748         if (attr) {
5749                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5750                                                   type->policy, NULL);
5751                 if (err < 0)
5752                         goto err2;
5753         } else {
5754                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5755         }
5756
5757         if (type->select_ops) {
5758                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5759                 if (IS_ERR(ops)) {
5760                         err = PTR_ERR(ops);
5761                         goto err2;
5762                 }
5763         } else {
5764                 ops = type->ops;
5765         }
5766
5767         err = -ENOMEM;
5768         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5769         if (!obj)
5770                 goto err2;
5771
5772         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5773         if (err < 0)
5774                 goto err3;
5775
5776         obj->ops = ops;
5777
5778         kfree(tb);
5779         return obj;
5780 err3:
5781         kfree(obj);
5782 err2:
5783         kfree(tb);
5784 err1:
5785         return ERR_PTR(err);
5786 }
5787
5788 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5789                            struct nft_object *obj, bool reset)
5790 {
5791         struct nlattr *nest;
5792
5793         nest = nla_nest_start_noflag(skb, attr);
5794         if (!nest)
5795                 goto nla_put_failure;
5796         if (obj->ops->dump(skb, obj, reset) < 0)
5797                 goto nla_put_failure;
5798         nla_nest_end(skb, nest);
5799         return 0;
5800
5801 nla_put_failure:
5802         return -1;
5803 }
5804
5805 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5806 {
5807         const struct nft_object_type *type;
5808
5809         list_for_each_entry(type, &nf_tables_objects, list) {
5810                 if (objtype == type->type)
5811                         return type;
5812         }
5813         return NULL;
5814 }
5815
5816 static const struct nft_object_type *
5817 nft_obj_type_get(struct net *net, u32 objtype)
5818 {
5819         const struct nft_object_type *type;
5820
5821         type = __nft_obj_type_get(objtype);
5822         if (type != NULL && try_module_get(type->owner))
5823                 return type;
5824
5825         lockdep_nfnl_nft_mutex_not_held();
5826 #ifdef CONFIG_MODULES
5827         if (type == NULL) {
5828                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5829                         return ERR_PTR(-EAGAIN);
5830         }
5831 #endif
5832         return ERR_PTR(-ENOENT);
5833 }
5834
5835 static int nf_tables_updobj(const struct nft_ctx *ctx,
5836                             const struct nft_object_type *type,
5837                             const struct nlattr *attr,
5838                             struct nft_object *obj)
5839 {
5840         struct nft_object *newobj;
5841         struct nft_trans *trans;
5842         int err;
5843
5844         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5845                                 sizeof(struct nft_trans_obj));
5846         if (!trans)
5847                 return -ENOMEM;
5848
5849         newobj = nft_obj_init(ctx, type, attr);
5850         if (IS_ERR(newobj)) {
5851                 err = PTR_ERR(newobj);
5852                 goto err_free_trans;
5853         }
5854
5855         nft_trans_obj(trans) = obj;
5856         nft_trans_obj_update(trans) = true;
5857         nft_trans_obj_newobj(trans) = newobj;
5858         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5859
5860         return 0;
5861
5862 err_free_trans:
5863         kfree(trans);
5864         return err;
5865 }
5866
5867 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5868                             struct sk_buff *skb, const struct nlmsghdr *nlh,
5869                             const struct nlattr * const nla[],
5870                             struct netlink_ext_ack *extack)
5871 {
5872         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5873         const struct nft_object_type *type;
5874         u8 genmask = nft_genmask_next(net);
5875         int family = nfmsg->nfgen_family;
5876         struct nft_table *table;
5877         struct nft_object *obj;
5878         struct nft_ctx ctx;
5879         u32 objtype;
5880         int err;
5881
5882         if (!nla[NFTA_OBJ_TYPE] ||
5883             !nla[NFTA_OBJ_NAME] ||
5884             !nla[NFTA_OBJ_DATA])
5885                 return -EINVAL;
5886
5887         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5888         if (IS_ERR(table)) {
5889                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5890                 return PTR_ERR(table);
5891         }
5892
5893         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5894         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5895         if (IS_ERR(obj)) {
5896                 err = PTR_ERR(obj);
5897                 if (err != -ENOENT) {
5898                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5899                         return err;
5900                 }
5901         } else {
5902                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5903                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5904                         return -EEXIST;
5905                 }
5906                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5907                         return -EOPNOTSUPP;
5908
5909                 type = __nft_obj_type_get(objtype);
5910                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5911
5912                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5913         }
5914
5915         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5916
5917         type = nft_obj_type_get(net, objtype);
5918         if (IS_ERR(type))
5919                 return PTR_ERR(type);
5920
5921         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5922         if (IS_ERR(obj)) {
5923                 err = PTR_ERR(obj);
5924                 goto err1;
5925         }
5926         obj->key.table = table;
5927         obj->handle = nf_tables_alloc_handle(table);
5928
5929         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5930         if (!obj->key.name) {
5931                 err = -ENOMEM;
5932                 goto err2;
5933         }
5934
5935         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
5936         if (err < 0)
5937                 goto err3;
5938
5939         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
5940                               nft_objname_ht_params);
5941         if (err < 0)
5942                 goto err4;
5943
5944         list_add_tail_rcu(&obj->list, &table->objects);
5945         table->use++;
5946         return 0;
5947 err4:
5948         /* queued in transaction log */
5949         INIT_LIST_HEAD(&obj->list);
5950         return err;
5951 err3:
5952         kfree(obj->key.name);
5953 err2:
5954         if (obj->ops->destroy)
5955                 obj->ops->destroy(&ctx, obj);
5956         kfree(obj);
5957 err1:
5958         module_put(type->owner);
5959         return err;
5960 }
5961
5962 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
5963                                    u32 portid, u32 seq, int event, u32 flags,
5964                                    int family, const struct nft_table *table,
5965                                    struct nft_object *obj, bool reset)
5966 {
5967         struct nfgenmsg *nfmsg;
5968         struct nlmsghdr *nlh;
5969
5970         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5971         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
5972         if (nlh == NULL)
5973                 goto nla_put_failure;
5974
5975         nfmsg = nlmsg_data(nlh);
5976         nfmsg->nfgen_family     = family;
5977         nfmsg->version          = NFNETLINK_V0;
5978         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
5979
5980         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
5981             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
5982             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
5983             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
5984             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
5985             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
5986                          NFTA_OBJ_PAD))
5987                 goto nla_put_failure;
5988
5989         nlmsg_end(skb, nlh);
5990         return 0;
5991
5992 nla_put_failure:
5993         nlmsg_trim(skb, nlh);
5994         return -1;
5995 }
5996
5997 struct nft_obj_filter {
5998         char            *table;
5999         u32             type;
6000 };
6001
6002 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6003 {
6004         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6005         const struct nft_table *table;
6006         unsigned int idx = 0, s_idx = cb->args[0];
6007         struct nft_obj_filter *filter = cb->data;
6008         struct net *net = sock_net(skb->sk);
6009         int family = nfmsg->nfgen_family;
6010         struct nft_object *obj;
6011         bool reset = false;
6012
6013         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6014                 reset = true;
6015
6016         rcu_read_lock();
6017         cb->seq = net->nft.base_seq;
6018
6019         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6020                 if (family != NFPROTO_UNSPEC && family != table->family)
6021                         continue;
6022
6023                 list_for_each_entry_rcu(obj, &table->objects, list) {
6024                         if (!nft_is_active(net, obj))
6025                                 goto cont;
6026                         if (idx < s_idx)
6027                                 goto cont;
6028                         if (idx > s_idx)
6029                                 memset(&cb->args[1], 0,
6030                                        sizeof(cb->args) - sizeof(cb->args[0]));
6031                         if (filter && filter->table &&
6032                             strcmp(filter->table, table->name))
6033                                 goto cont;
6034                         if (filter &&
6035                             filter->type != NFT_OBJECT_UNSPEC &&
6036                             obj->ops->type->type != filter->type)
6037                                 goto cont;
6038
6039                         if (reset) {
6040                                 char *buf = kasprintf(GFP_ATOMIC,
6041                                                       "%s:%llu;?:0",
6042                                                       table->name,
6043                                                       table->handle);
6044
6045                                 audit_log_nfcfg(buf,
6046                                                 family,
6047                                                 obj->handle,
6048                                                 AUDIT_NFT_OP_OBJ_RESET,
6049                                                 GFP_ATOMIC);
6050                                 kfree(buf);
6051                         }
6052
6053                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6054                                                     cb->nlh->nlmsg_seq,
6055                                                     NFT_MSG_NEWOBJ,
6056                                                     NLM_F_MULTI | NLM_F_APPEND,
6057                                                     table->family, table,
6058                                                     obj, reset) < 0)
6059                                 goto done;
6060
6061                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6062 cont:
6063                         idx++;
6064                 }
6065         }
6066 done:
6067         rcu_read_unlock();
6068
6069         cb->args[0] = idx;
6070         return skb->len;
6071 }
6072
6073 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6074 {
6075         const struct nlattr * const *nla = cb->data;
6076         struct nft_obj_filter *filter = NULL;
6077
6078         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6079                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6080                 if (!filter)
6081                         return -ENOMEM;
6082
6083                 if (nla[NFTA_OBJ_TABLE]) {
6084                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6085                         if (!filter->table) {
6086                                 kfree(filter);
6087                                 return -ENOMEM;
6088                         }
6089                 }
6090
6091                 if (nla[NFTA_OBJ_TYPE])
6092                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6093         }
6094
6095         cb->data = filter;
6096         return 0;
6097 }
6098
6099 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6100 {
6101         struct nft_obj_filter *filter = cb->data;
6102
6103         if (filter) {
6104                 kfree(filter->table);
6105                 kfree(filter);
6106         }
6107
6108         return 0;
6109 }
6110
6111 /* called with rcu_read_lock held */
6112 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6113                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6114                             const struct nlattr * const nla[],
6115                             struct netlink_ext_ack *extack)
6116 {
6117         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6118         u8 genmask = nft_genmask_cur(net);
6119         int family = nfmsg->nfgen_family;
6120         const struct nft_table *table;
6121         struct nft_object *obj;
6122         struct sk_buff *skb2;
6123         bool reset = false;
6124         u32 objtype;
6125         int err;
6126
6127         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6128                 struct netlink_dump_control c = {
6129                         .start = nf_tables_dump_obj_start,
6130                         .dump = nf_tables_dump_obj,
6131                         .done = nf_tables_dump_obj_done,
6132                         .module = THIS_MODULE,
6133                         .data = (void *)nla,
6134                 };
6135
6136                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6137         }
6138
6139         if (!nla[NFTA_OBJ_NAME] ||
6140             !nla[NFTA_OBJ_TYPE])
6141                 return -EINVAL;
6142
6143         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6144         if (IS_ERR(table)) {
6145                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6146                 return PTR_ERR(table);
6147         }
6148
6149         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6150         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6151         if (IS_ERR(obj)) {
6152                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6153                 return PTR_ERR(obj);
6154         }
6155
6156         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6157         if (!skb2)
6158                 return -ENOMEM;
6159
6160         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6161                 reset = true;
6162
6163         if (reset) {
6164                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6165                                       table->name, table->handle);
6166
6167                 audit_log_nfcfg(buf,
6168                                 family,
6169                                 obj->handle,
6170                                 AUDIT_NFT_OP_OBJ_RESET,
6171                                 GFP_ATOMIC);
6172                 kfree(buf);
6173         }
6174
6175         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6176                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6177                                       family, table, obj, reset);
6178         if (err < 0)
6179                 goto err_fill_obj_info;
6180
6181         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6182
6183 err_fill_obj_info:
6184         kfree_skb(skb2);
6185         return err;
6186 }
6187
6188 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6189 {
6190         if (obj->ops->destroy)
6191                 obj->ops->destroy(ctx, obj);
6192
6193         module_put(obj->ops->type->owner);
6194         kfree(obj->key.name);
6195         kfree(obj);
6196 }
6197
6198 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6199                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6200                             const struct nlattr * const nla[],
6201                             struct netlink_ext_ack *extack)
6202 {
6203         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6204         u8 genmask = nft_genmask_next(net);
6205         int family = nfmsg->nfgen_family;
6206         const struct nlattr *attr;
6207         struct nft_table *table;
6208         struct nft_object *obj;
6209         struct nft_ctx ctx;
6210         u32 objtype;
6211
6212         if (!nla[NFTA_OBJ_TYPE] ||
6213             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6214                 return -EINVAL;
6215
6216         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6217         if (IS_ERR(table)) {
6218                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6219                 return PTR_ERR(table);
6220         }
6221
6222         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6223         if (nla[NFTA_OBJ_HANDLE]) {
6224                 attr = nla[NFTA_OBJ_HANDLE];
6225                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6226         } else {
6227                 attr = nla[NFTA_OBJ_NAME];
6228                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6229         }
6230
6231         if (IS_ERR(obj)) {
6232                 NL_SET_BAD_ATTR(extack, attr);
6233                 return PTR_ERR(obj);
6234         }
6235         if (obj->use > 0) {
6236                 NL_SET_BAD_ATTR(extack, attr);
6237                 return -EBUSY;
6238         }
6239
6240         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6241
6242         return nft_delobj(&ctx, obj);
6243 }
6244
6245 void nft_obj_notify(struct net *net, const struct nft_table *table,
6246                     struct nft_object *obj, u32 portid, u32 seq, int event,
6247                     int family, int report, gfp_t gfp)
6248 {
6249         struct sk_buff *skb;
6250         int err;
6251         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6252                               table->name, table->handle);
6253
6254         audit_log_nfcfg(buf,
6255                         family,
6256                         obj->handle,
6257                         event == NFT_MSG_NEWOBJ ?
6258                                 AUDIT_NFT_OP_OBJ_REGISTER :
6259                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6260                         gfp);
6261         kfree(buf);
6262
6263         if (!report &&
6264             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6265                 return;
6266
6267         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6268         if (skb == NULL)
6269                 goto err;
6270
6271         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6272                                       table, obj, false);
6273         if (err < 0) {
6274                 kfree_skb(skb);
6275                 goto err;
6276         }
6277
6278         nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report, gfp);
6279         return;
6280 err:
6281         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6282 }
6283 EXPORT_SYMBOL_GPL(nft_obj_notify);
6284
6285 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6286                                  struct nft_object *obj, int event)
6287 {
6288         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6289                        ctx->family, ctx->report, GFP_KERNEL);
6290 }
6291
6292 /*
6293  * Flow tables
6294  */
6295 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6296 {
6297         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6298         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6299         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6300 }
6301 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6302
6303 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6304 {
6305         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6306         list_del_rcu(&type->list);
6307         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6308 }
6309 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6310
6311 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6312         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6313                                             .len = NFT_NAME_MAXLEN - 1 },
6314         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6315                                             .len = NFT_NAME_MAXLEN - 1 },
6316         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6317         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6318         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6319 };
6320
6321 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6322                                            const struct nlattr *nla, u8 genmask)
6323 {
6324         struct nft_flowtable *flowtable;
6325
6326         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6327                 if (!nla_strcmp(nla, flowtable->name) &&
6328                     nft_active_genmask(flowtable, genmask))
6329                         return flowtable;
6330         }
6331         return ERR_PTR(-ENOENT);
6332 }
6333 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6334
6335 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6336                                     struct nft_flowtable *flowtable,
6337                                     enum nft_trans_phase phase)
6338 {
6339         switch (phase) {
6340         case NFT_TRANS_PREPARE:
6341         case NFT_TRANS_ABORT:
6342         case NFT_TRANS_RELEASE:
6343                 flowtable->use--;
6344                 fallthrough;
6345         default:
6346                 return;
6347         }
6348 }
6349 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6350
6351 static struct nft_flowtable *
6352 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6353                               const struct nlattr *nla, u8 genmask)
6354 {
6355        struct nft_flowtable *flowtable;
6356
6357        list_for_each_entry(flowtable, &table->flowtables, list) {
6358                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6359                    nft_active_genmask(flowtable, genmask))
6360                        return flowtable;
6361        }
6362        return ERR_PTR(-ENOENT);
6363 }
6364
6365 struct nft_flowtable_hook {
6366         u32                     num;
6367         int                     priority;
6368         struct list_head        list;
6369 };
6370
6371 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6372         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6373         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6374         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6375 };
6376
6377 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6378                                     const struct nlattr *attr,
6379                                     struct nft_flowtable_hook *flowtable_hook,
6380                                     struct nft_flowtable *flowtable, bool add)
6381 {
6382         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6383         struct nft_hook *hook;
6384         int hooknum, priority;
6385         int err;
6386
6387         INIT_LIST_HEAD(&flowtable_hook->list);
6388
6389         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6390                                           nft_flowtable_hook_policy, NULL);
6391         if (err < 0)
6392                 return err;
6393
6394         if (add) {
6395                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6396                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6397                         return -EINVAL;
6398
6399                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6400                 if (hooknum != NF_NETDEV_INGRESS)
6401                         return -EOPNOTSUPP;
6402
6403                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6404
6405                 flowtable_hook->priority        = priority;
6406                 flowtable_hook->num             = hooknum;
6407         } else {
6408                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6409                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6410                         if (hooknum != flowtable->hooknum)
6411                                 return -EOPNOTSUPP;
6412                 }
6413
6414                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6415                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6416                         if (priority != flowtable->data.priority)
6417                                 return -EOPNOTSUPP;
6418                 }
6419
6420                 flowtable_hook->priority        = flowtable->data.priority;
6421                 flowtable_hook->num             = flowtable->hooknum;
6422         }
6423
6424         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6425                 err = nf_tables_parse_netdev_hooks(ctx->net,
6426                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6427                                                    &flowtable_hook->list);
6428                 if (err < 0)
6429                         return err;
6430         }
6431
6432         list_for_each_entry(hook, &flowtable_hook->list, list) {
6433                 hook->ops.pf            = NFPROTO_NETDEV;
6434                 hook->ops.hooknum       = flowtable_hook->num;
6435                 hook->ops.priority      = flowtable_hook->priority;
6436                 hook->ops.priv          = &flowtable->data;
6437                 hook->ops.hook          = flowtable->data.type->hook;
6438         }
6439
6440         return err;
6441 }
6442
6443 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6444 {
6445         const struct nf_flowtable_type *type;
6446
6447         list_for_each_entry(type, &nf_tables_flowtables, list) {
6448                 if (family == type->family)
6449                         return type;
6450         }
6451         return NULL;
6452 }
6453
6454 static const struct nf_flowtable_type *
6455 nft_flowtable_type_get(struct net *net, u8 family)
6456 {
6457         const struct nf_flowtable_type *type;
6458
6459         type = __nft_flowtable_type_get(family);
6460         if (type != NULL && try_module_get(type->owner))
6461                 return type;
6462
6463         lockdep_nfnl_nft_mutex_not_held();
6464 #ifdef CONFIG_MODULES
6465         if (type == NULL) {
6466                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6467                         return ERR_PTR(-EAGAIN);
6468         }
6469 #endif
6470         return ERR_PTR(-ENOENT);
6471 }
6472
6473 /* Only called from error and netdev event paths. */
6474 static void nft_unregister_flowtable_hook(struct net *net,
6475                                           struct nft_flowtable *flowtable,
6476                                           struct nft_hook *hook)
6477 {
6478         nf_unregister_net_hook(net, &hook->ops);
6479         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6480                                     FLOW_BLOCK_UNBIND);
6481 }
6482
6483 static void nft_unregister_flowtable_net_hooks(struct net *net,
6484                                                struct list_head *hook_list)
6485 {
6486         struct nft_hook *hook;
6487
6488         list_for_each_entry(hook, hook_list, list)
6489                 nf_unregister_net_hook(net, &hook->ops);
6490 }
6491
6492 static int nft_register_flowtable_net_hooks(struct net *net,
6493                                             struct nft_table *table,
6494                                             struct list_head *hook_list,
6495                                             struct nft_flowtable *flowtable)
6496 {
6497         struct nft_hook *hook, *hook2, *next;
6498         struct nft_flowtable *ft;
6499         int err, i = 0;
6500
6501         list_for_each_entry(hook, hook_list, list) {
6502                 list_for_each_entry(ft, &table->flowtables, list) {
6503                         list_for_each_entry(hook2, &ft->hook_list, list) {
6504                                 if (hook->ops.dev == hook2->ops.dev &&
6505                                     hook->ops.pf == hook2->ops.pf) {
6506                                         err = -EEXIST;
6507                                         goto err_unregister_net_hooks;
6508                                 }
6509                         }
6510                 }
6511
6512                 err = flowtable->data.type->setup(&flowtable->data,
6513                                                   hook->ops.dev,
6514                                                   FLOW_BLOCK_BIND);
6515                 if (err < 0)
6516                         goto err_unregister_net_hooks;
6517
6518                 err = nf_register_net_hook(net, &hook->ops);
6519                 if (err < 0) {
6520                         flowtable->data.type->setup(&flowtable->data,
6521                                                     hook->ops.dev,
6522                                                     FLOW_BLOCK_UNBIND);
6523                         goto err_unregister_net_hooks;
6524                 }
6525
6526                 i++;
6527         }
6528
6529         return 0;
6530
6531 err_unregister_net_hooks:
6532         list_for_each_entry_safe(hook, next, hook_list, list) {
6533                 if (i-- <= 0)
6534                         break;
6535
6536                 nft_unregister_flowtable_hook(net, flowtable, hook);
6537                 list_del_rcu(&hook->list);
6538                 kfree_rcu(hook, rcu);
6539         }
6540
6541         return err;
6542 }
6543
6544 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6545 {
6546         struct nft_hook *hook, *next;
6547
6548         list_for_each_entry_safe(hook, next, hook_list, list) {
6549                 list_del_rcu(&hook->list);
6550                 kfree_rcu(hook, rcu);
6551         }
6552 }
6553
6554 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6555                                 struct nft_flowtable *flowtable)
6556 {
6557         const struct nlattr * const *nla = ctx->nla;
6558         struct nft_flowtable_hook flowtable_hook;
6559         struct nft_hook *hook, *next;
6560         struct nft_trans *trans;
6561         bool unregister = false;
6562         int err;
6563
6564         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6565                                        &flowtable_hook, flowtable, false);
6566         if (err < 0)
6567                 return err;
6568
6569         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6570                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6571                         list_del(&hook->list);
6572                         kfree(hook);
6573                 }
6574         }
6575
6576         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6577                                                &flowtable_hook.list, flowtable);
6578         if (err < 0)
6579                 goto err_flowtable_update_hook;
6580
6581         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6582                                 sizeof(struct nft_trans_flowtable));
6583         if (!trans) {
6584                 unregister = true;
6585                 err = -ENOMEM;
6586                 goto err_flowtable_update_hook;
6587         }
6588
6589         nft_trans_flowtable(trans) = flowtable;
6590         nft_trans_flowtable_update(trans) = true;
6591         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6592         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6593
6594         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6595
6596         return 0;
6597
6598 err_flowtable_update_hook:
6599         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6600                 if (unregister)
6601                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6602                 list_del_rcu(&hook->list);
6603                 kfree_rcu(hook, rcu);
6604         }
6605
6606         return err;
6607
6608 }
6609
6610 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6611                                   struct sk_buff *skb,
6612                                   const struct nlmsghdr *nlh,
6613                                   const struct nlattr * const nla[],
6614                                   struct netlink_ext_ack *extack)
6615 {
6616         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6617         struct nft_flowtable_hook flowtable_hook;
6618         const struct nf_flowtable_type *type;
6619         u8 genmask = nft_genmask_next(net);
6620         int family = nfmsg->nfgen_family;
6621         struct nft_flowtable *flowtable;
6622         struct nft_hook *hook, *next;
6623         struct nft_table *table;
6624         struct nft_ctx ctx;
6625         int err;
6626
6627         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6628             !nla[NFTA_FLOWTABLE_NAME] ||
6629             !nla[NFTA_FLOWTABLE_HOOK])
6630                 return -EINVAL;
6631
6632         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6633                                  genmask);
6634         if (IS_ERR(table)) {
6635                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6636                 return PTR_ERR(table);
6637         }
6638
6639         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6640                                          genmask);
6641         if (IS_ERR(flowtable)) {
6642                 err = PTR_ERR(flowtable);
6643                 if (err != -ENOENT) {
6644                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6645                         return err;
6646                 }
6647         } else {
6648                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6649                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6650                         return -EEXIST;
6651                 }
6652
6653                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6654
6655                 return nft_flowtable_update(&ctx, nlh, flowtable);
6656         }
6657
6658         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6659
6660         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6661         if (!flowtable)
6662                 return -ENOMEM;
6663
6664         flowtable->table = table;
6665         flowtable->handle = nf_tables_alloc_handle(table);
6666         INIT_LIST_HEAD(&flowtable->hook_list);
6667
6668         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6669         if (!flowtable->name) {
6670                 err = -ENOMEM;
6671                 goto err1;
6672         }
6673
6674         type = nft_flowtable_type_get(net, family);
6675         if (IS_ERR(type)) {
6676                 err = PTR_ERR(type);
6677                 goto err2;
6678         }
6679
6680         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6681                 flowtable->data.flags =
6682                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6683                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6684                         goto err3;
6685         }
6686
6687         write_pnet(&flowtable->data.net, net);
6688         flowtable->data.type = type;
6689         err = type->init(&flowtable->data);
6690         if (err < 0)
6691                 goto err3;
6692
6693         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6694                                        &flowtable_hook, flowtable, true);
6695         if (err < 0)
6696                 goto err4;
6697
6698         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6699         flowtable->data.priority = flowtable_hook.priority;
6700         flowtable->hooknum = flowtable_hook.num;
6701
6702         err = nft_register_flowtable_net_hooks(ctx.net, table,
6703                                                &flowtable->hook_list,
6704                                                flowtable);
6705         if (err < 0) {
6706                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6707                 goto err4;
6708         }
6709
6710         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6711         if (err < 0)
6712                 goto err5;
6713
6714         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6715         table->use++;
6716
6717         return 0;
6718 err5:
6719         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6720                 nft_unregister_flowtable_hook(net, flowtable, hook);
6721                 list_del_rcu(&hook->list);
6722                 kfree_rcu(hook, rcu);
6723         }
6724 err4:
6725         flowtable->data.type->free(&flowtable->data);
6726 err3:
6727         module_put(type->owner);
6728 err2:
6729         kfree(flowtable->name);
6730 err1:
6731         kfree(flowtable);
6732         return err;
6733 }
6734
6735 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6736 {
6737         struct nft_hook *this, *next;
6738
6739         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6740                 list_del(&this->list);
6741                 kfree(this);
6742         }
6743 }
6744
6745 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6746                                  struct nft_flowtable *flowtable)
6747 {
6748         const struct nlattr * const *nla = ctx->nla;
6749         struct nft_flowtable_hook flowtable_hook;
6750         struct nft_hook *this, *hook;
6751         struct nft_trans *trans;
6752         int err;
6753
6754         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6755                                        &flowtable_hook, flowtable, false);
6756         if (err < 0)
6757                 return err;
6758
6759         list_for_each_entry(this, &flowtable_hook.list, list) {
6760                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6761                 if (!hook) {
6762                         err = -ENOENT;
6763                         goto err_flowtable_del_hook;
6764                 }
6765                 hook->inactive = true;
6766         }
6767
6768         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
6769                                 sizeof(struct nft_trans_flowtable));
6770         if (!trans) {
6771                 err = -ENOMEM;
6772                 goto err_flowtable_del_hook;
6773         }
6774
6775         nft_trans_flowtable(trans) = flowtable;
6776         nft_trans_flowtable_update(trans) = true;
6777         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6778         nft_flowtable_hook_release(&flowtable_hook);
6779
6780         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6781
6782         return 0;
6783
6784 err_flowtable_del_hook:
6785         list_for_each_entry(this, &flowtable_hook.list, list) {
6786                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6787                 if (!hook)
6788                         break;
6789
6790                 hook->inactive = false;
6791         }
6792         nft_flowtable_hook_release(&flowtable_hook);
6793
6794         return err;
6795 }
6796
6797 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6798                                   struct sk_buff *skb,
6799                                   const struct nlmsghdr *nlh,
6800                                   const struct nlattr * const nla[],
6801                                   struct netlink_ext_ack *extack)
6802 {
6803         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6804         u8 genmask = nft_genmask_next(net);
6805         int family = nfmsg->nfgen_family;
6806         struct nft_flowtable *flowtable;
6807         const struct nlattr *attr;
6808         struct nft_table *table;
6809         struct nft_ctx ctx;
6810
6811         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6812             (!nla[NFTA_FLOWTABLE_NAME] &&
6813              !nla[NFTA_FLOWTABLE_HANDLE]))
6814                 return -EINVAL;
6815
6816         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6817                                  genmask);
6818         if (IS_ERR(table)) {
6819                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6820                 return PTR_ERR(table);
6821         }
6822
6823         if (nla[NFTA_FLOWTABLE_HANDLE]) {
6824                 attr = nla[NFTA_FLOWTABLE_HANDLE];
6825                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6826         } else {
6827                 attr = nla[NFTA_FLOWTABLE_NAME];
6828                 flowtable = nft_flowtable_lookup(table, attr, genmask);
6829         }
6830
6831         if (IS_ERR(flowtable)) {
6832                 NL_SET_BAD_ATTR(extack, attr);
6833                 return PTR_ERR(flowtable);
6834         }
6835
6836         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6837
6838         if (nla[NFTA_FLOWTABLE_HOOK])
6839                 return nft_delflowtable_hook(&ctx, flowtable);
6840
6841         if (flowtable->use > 0) {
6842                 NL_SET_BAD_ATTR(extack, attr);
6843                 return -EBUSY;
6844         }
6845
6846         return nft_delflowtable(&ctx, flowtable);
6847 }
6848
6849 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6850                                          u32 portid, u32 seq, int event,
6851                                          u32 flags, int family,
6852                                          struct nft_flowtable *flowtable,
6853                                          struct list_head *hook_list)
6854 {
6855         struct nlattr *nest, *nest_devs;
6856         struct nfgenmsg *nfmsg;
6857         struct nft_hook *hook;
6858         struct nlmsghdr *nlh;
6859
6860         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6861         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6862         if (nlh == NULL)
6863                 goto nla_put_failure;
6864
6865         nfmsg = nlmsg_data(nlh);
6866         nfmsg->nfgen_family     = family;
6867         nfmsg->version          = NFNETLINK_V0;
6868         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6869
6870         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6871             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6872             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6873             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6874                          NFTA_FLOWTABLE_PAD) ||
6875             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6876                 goto nla_put_failure;
6877
6878         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6879         if (!nest)
6880                 goto nla_put_failure;
6881         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6882             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6883                 goto nla_put_failure;
6884
6885         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6886         if (!nest_devs)
6887                 goto nla_put_failure;
6888
6889         list_for_each_entry_rcu(hook, hook_list, list) {
6890                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6891                         goto nla_put_failure;
6892         }
6893         nla_nest_end(skb, nest_devs);
6894         nla_nest_end(skb, nest);
6895
6896         nlmsg_end(skb, nlh);
6897         return 0;
6898
6899 nla_put_failure:
6900         nlmsg_trim(skb, nlh);
6901         return -1;
6902 }
6903
6904 struct nft_flowtable_filter {
6905         char            *table;
6906 };
6907
6908 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6909                                     struct netlink_callback *cb)
6910 {
6911         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6912         struct nft_flowtable_filter *filter = cb->data;
6913         unsigned int idx = 0, s_idx = cb->args[0];
6914         struct net *net = sock_net(skb->sk);
6915         int family = nfmsg->nfgen_family;
6916         struct nft_flowtable *flowtable;
6917         const struct nft_table *table;
6918
6919         rcu_read_lock();
6920         cb->seq = net->nft.base_seq;
6921
6922         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6923                 if (family != NFPROTO_UNSPEC && family != table->family)
6924                         continue;
6925
6926                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6927                         if (!nft_is_active(net, flowtable))
6928                                 goto cont;
6929                         if (idx < s_idx)
6930                                 goto cont;
6931                         if (idx > s_idx)
6932                                 memset(&cb->args[1], 0,
6933                                        sizeof(cb->args) - sizeof(cb->args[0]));
6934                         if (filter && filter->table &&
6935                             strcmp(filter->table, table->name))
6936                                 goto cont;
6937
6938                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
6939                                                           cb->nlh->nlmsg_seq,
6940                                                           NFT_MSG_NEWFLOWTABLE,
6941                                                           NLM_F_MULTI | NLM_F_APPEND,
6942                                                           table->family,
6943                                                           flowtable,
6944                                                           &flowtable->hook_list) < 0)
6945                                 goto done;
6946
6947                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6948 cont:
6949                         idx++;
6950                 }
6951         }
6952 done:
6953         rcu_read_unlock();
6954
6955         cb->args[0] = idx;
6956         return skb->len;
6957 }
6958
6959 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
6960 {
6961         const struct nlattr * const *nla = cb->data;
6962         struct nft_flowtable_filter *filter = NULL;
6963
6964         if (nla[NFTA_FLOWTABLE_TABLE]) {
6965                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6966                 if (!filter)
6967                         return -ENOMEM;
6968
6969                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
6970                                            GFP_ATOMIC);
6971                 if (!filter->table) {
6972                         kfree(filter);
6973                         return -ENOMEM;
6974                 }
6975         }
6976
6977         cb->data = filter;
6978         return 0;
6979 }
6980
6981 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
6982 {
6983         struct nft_flowtable_filter *filter = cb->data;
6984
6985         if (!filter)
6986                 return 0;
6987
6988         kfree(filter->table);
6989         kfree(filter);
6990
6991         return 0;
6992 }
6993
6994 /* called with rcu_read_lock held */
6995 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
6996                                   struct sk_buff *skb,
6997                                   const struct nlmsghdr *nlh,
6998                                   const struct nlattr * const nla[],
6999                                   struct netlink_ext_ack *extack)
7000 {
7001         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7002         u8 genmask = nft_genmask_cur(net);
7003         int family = nfmsg->nfgen_family;
7004         struct nft_flowtable *flowtable;
7005         const struct nft_table *table;
7006         struct sk_buff *skb2;
7007         int err;
7008
7009         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7010                 struct netlink_dump_control c = {
7011                         .start = nf_tables_dump_flowtable_start,
7012                         .dump = nf_tables_dump_flowtable,
7013                         .done = nf_tables_dump_flowtable_done,
7014                         .module = THIS_MODULE,
7015                         .data = (void *)nla,
7016                 };
7017
7018                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7019         }
7020
7021         if (!nla[NFTA_FLOWTABLE_NAME])
7022                 return -EINVAL;
7023
7024         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7025                                  genmask);
7026         if (IS_ERR(table))
7027                 return PTR_ERR(table);
7028
7029         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7030                                          genmask);
7031         if (IS_ERR(flowtable))
7032                 return PTR_ERR(flowtable);
7033
7034         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7035         if (!skb2)
7036                 return -ENOMEM;
7037
7038         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7039                                             nlh->nlmsg_seq,
7040                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7041                                             flowtable, &flowtable->hook_list);
7042         if (err < 0)
7043                 goto err_fill_flowtable_info;
7044
7045         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7046
7047 err_fill_flowtable_info:
7048         kfree_skb(skb2);
7049         return err;
7050 }
7051
7052 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7053                                        struct nft_flowtable *flowtable,
7054                                        struct list_head *hook_list,
7055                                        int event)
7056 {
7057         struct sk_buff *skb;
7058         int err;
7059         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7060                               flowtable->table->name, flowtable->table->handle,
7061                               flowtable->name, flowtable->handle);
7062
7063         audit_log_nfcfg(buf,
7064                         ctx->family,
7065                         flowtable->hooknum,
7066                         event == NFT_MSG_NEWFLOWTABLE ?
7067                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7068                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7069                         GFP_KERNEL);
7070         kfree(buf);
7071
7072         if (ctx->report &&
7073             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7074                 return;
7075
7076         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7077         if (skb == NULL)
7078                 goto err;
7079
7080         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7081                                             ctx->seq, event, 0,
7082                                             ctx->family, flowtable, hook_list);
7083         if (err < 0) {
7084                 kfree_skb(skb);
7085                 goto err;
7086         }
7087
7088         nfnetlink_send(skb, ctx->net, ctx->portid, NFNLGRP_NFTABLES,
7089                        ctx->report, GFP_KERNEL);
7090         return;
7091 err:
7092         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7093 }
7094
7095 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7096 {
7097         struct nft_hook *hook, *next;
7098
7099         flowtable->data.type->free(&flowtable->data);
7100         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7101                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7102                                             FLOW_BLOCK_UNBIND);
7103                 list_del_rcu(&hook->list);
7104                 kfree(hook);
7105         }
7106         kfree(flowtable->name);
7107         module_put(flowtable->data.type->owner);
7108         kfree(flowtable);
7109 }
7110
7111 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7112                                    u32 portid, u32 seq)
7113 {
7114         struct nlmsghdr *nlh;
7115         struct nfgenmsg *nfmsg;
7116         char buf[TASK_COMM_LEN];
7117         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7118
7119         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7120         if (nlh == NULL)
7121                 goto nla_put_failure;
7122
7123         nfmsg = nlmsg_data(nlh);
7124         nfmsg->nfgen_family     = AF_UNSPEC;
7125         nfmsg->version          = NFNETLINK_V0;
7126         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7127
7128         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7129             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7130             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7131                 goto nla_put_failure;
7132
7133         nlmsg_end(skb, nlh);
7134         return 0;
7135
7136 nla_put_failure:
7137         nlmsg_trim(skb, nlh);
7138         return -EMSGSIZE;
7139 }
7140
7141 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7142                                 struct nft_flowtable *flowtable)
7143 {
7144         struct nft_hook *hook;
7145
7146         list_for_each_entry(hook, &flowtable->hook_list, list) {
7147                 if (hook->ops.dev != dev)
7148                         continue;
7149
7150                 /* flow_offload_netdev_event() cleans up entries for us. */
7151                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7152                 list_del_rcu(&hook->list);
7153                 kfree_rcu(hook, rcu);
7154                 break;
7155         }
7156 }
7157
7158 static int nf_tables_flowtable_event(struct notifier_block *this,
7159                                      unsigned long event, void *ptr)
7160 {
7161         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7162         struct nft_flowtable *flowtable;
7163         struct nft_table *table;
7164         struct net *net;
7165
7166         if (event != NETDEV_UNREGISTER)
7167                 return 0;
7168
7169         net = dev_net(dev);
7170         mutex_lock(&net->nft.commit_mutex);
7171         list_for_each_entry(table, &net->nft.tables, list) {
7172                 list_for_each_entry(flowtable, &table->flowtables, list) {
7173                         nft_flowtable_event(event, dev, flowtable);
7174                 }
7175         }
7176         mutex_unlock(&net->nft.commit_mutex);
7177
7178         return NOTIFY_DONE;
7179 }
7180
7181 static struct notifier_block nf_tables_flowtable_notifier = {
7182         .notifier_call  = nf_tables_flowtable_event,
7183 };
7184
7185 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7186                                  int event)
7187 {
7188         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7189         struct sk_buff *skb2;
7190         int err;
7191
7192         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7193                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7194
7195         if (nlmsg_report(nlh) &&
7196             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7197                 return;
7198
7199         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7200         if (skb2 == NULL)
7201                 goto err;
7202
7203         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7204                                       nlh->nlmsg_seq);
7205         if (err < 0) {
7206                 kfree_skb(skb2);
7207                 goto err;
7208         }
7209
7210         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7211                        nlmsg_report(nlh), GFP_KERNEL);
7212         return;
7213 err:
7214         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7215                           -ENOBUFS);
7216 }
7217
7218 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7219                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7220                             const struct nlattr * const nla[],
7221                             struct netlink_ext_ack *extack)
7222 {
7223         struct sk_buff *skb2;
7224         int err;
7225
7226         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7227         if (skb2 == NULL)
7228                 return -ENOMEM;
7229
7230         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7231                                       nlh->nlmsg_seq);
7232         if (err < 0)
7233                 goto err_fill_gen_info;
7234
7235         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7236
7237 err_fill_gen_info:
7238         kfree_skb(skb2);
7239         return err;
7240 }
7241
7242 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7243         [NFT_MSG_NEWTABLE] = {
7244                 .call_batch     = nf_tables_newtable,
7245                 .attr_count     = NFTA_TABLE_MAX,
7246                 .policy         = nft_table_policy,
7247         },
7248         [NFT_MSG_GETTABLE] = {
7249                 .call_rcu       = nf_tables_gettable,
7250                 .attr_count     = NFTA_TABLE_MAX,
7251                 .policy         = nft_table_policy,
7252         },
7253         [NFT_MSG_DELTABLE] = {
7254                 .call_batch     = nf_tables_deltable,
7255                 .attr_count     = NFTA_TABLE_MAX,
7256                 .policy         = nft_table_policy,
7257         },
7258         [NFT_MSG_NEWCHAIN] = {
7259                 .call_batch     = nf_tables_newchain,
7260                 .attr_count     = NFTA_CHAIN_MAX,
7261                 .policy         = nft_chain_policy,
7262         },
7263         [NFT_MSG_GETCHAIN] = {
7264                 .call_rcu       = nf_tables_getchain,
7265                 .attr_count     = NFTA_CHAIN_MAX,
7266                 .policy         = nft_chain_policy,
7267         },
7268         [NFT_MSG_DELCHAIN] = {
7269                 .call_batch     = nf_tables_delchain,
7270                 .attr_count     = NFTA_CHAIN_MAX,
7271                 .policy         = nft_chain_policy,
7272         },
7273         [NFT_MSG_NEWRULE] = {
7274                 .call_batch     = nf_tables_newrule,
7275                 .attr_count     = NFTA_RULE_MAX,
7276                 .policy         = nft_rule_policy,
7277         },
7278         [NFT_MSG_GETRULE] = {
7279                 .call_rcu       = nf_tables_getrule,
7280                 .attr_count     = NFTA_RULE_MAX,
7281                 .policy         = nft_rule_policy,
7282         },
7283         [NFT_MSG_DELRULE] = {
7284                 .call_batch     = nf_tables_delrule,
7285                 .attr_count     = NFTA_RULE_MAX,
7286                 .policy         = nft_rule_policy,
7287         },
7288         [NFT_MSG_NEWSET] = {
7289                 .call_batch     = nf_tables_newset,
7290                 .attr_count     = NFTA_SET_MAX,
7291                 .policy         = nft_set_policy,
7292         },
7293         [NFT_MSG_GETSET] = {
7294                 .call_rcu       = nf_tables_getset,
7295                 .attr_count     = NFTA_SET_MAX,
7296                 .policy         = nft_set_policy,
7297         },
7298         [NFT_MSG_DELSET] = {
7299                 .call_batch     = nf_tables_delset,
7300                 .attr_count     = NFTA_SET_MAX,
7301                 .policy         = nft_set_policy,
7302         },
7303         [NFT_MSG_NEWSETELEM] = {
7304                 .call_batch     = nf_tables_newsetelem,
7305                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7306                 .policy         = nft_set_elem_list_policy,
7307         },
7308         [NFT_MSG_GETSETELEM] = {
7309                 .call_rcu       = nf_tables_getsetelem,
7310                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7311                 .policy         = nft_set_elem_list_policy,
7312         },
7313         [NFT_MSG_DELSETELEM] = {
7314                 .call_batch     = nf_tables_delsetelem,
7315                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7316                 .policy         = nft_set_elem_list_policy,
7317         },
7318         [NFT_MSG_GETGEN] = {
7319                 .call_rcu       = nf_tables_getgen,
7320         },
7321         [NFT_MSG_NEWOBJ] = {
7322                 .call_batch     = nf_tables_newobj,
7323                 .attr_count     = NFTA_OBJ_MAX,
7324                 .policy         = nft_obj_policy,
7325         },
7326         [NFT_MSG_GETOBJ] = {
7327                 .call_rcu       = nf_tables_getobj,
7328                 .attr_count     = NFTA_OBJ_MAX,
7329                 .policy         = nft_obj_policy,
7330         },
7331         [NFT_MSG_DELOBJ] = {
7332                 .call_batch     = nf_tables_delobj,
7333                 .attr_count     = NFTA_OBJ_MAX,
7334                 .policy         = nft_obj_policy,
7335         },
7336         [NFT_MSG_GETOBJ_RESET] = {
7337                 .call_rcu       = nf_tables_getobj,
7338                 .attr_count     = NFTA_OBJ_MAX,
7339                 .policy         = nft_obj_policy,
7340         },
7341         [NFT_MSG_NEWFLOWTABLE] = {
7342                 .call_batch     = nf_tables_newflowtable,
7343                 .attr_count     = NFTA_FLOWTABLE_MAX,
7344                 .policy         = nft_flowtable_policy,
7345         },
7346         [NFT_MSG_GETFLOWTABLE] = {
7347                 .call_rcu       = nf_tables_getflowtable,
7348                 .attr_count     = NFTA_FLOWTABLE_MAX,
7349                 .policy         = nft_flowtable_policy,
7350         },
7351         [NFT_MSG_DELFLOWTABLE] = {
7352                 .call_batch     = nf_tables_delflowtable,
7353                 .attr_count     = NFTA_FLOWTABLE_MAX,
7354                 .policy         = nft_flowtable_policy,
7355         },
7356 };
7357
7358 static int nf_tables_validate(struct net *net)
7359 {
7360         struct nft_table *table;
7361
7362         switch (net->nft.validate_state) {
7363         case NFT_VALIDATE_SKIP:
7364                 break;
7365         case NFT_VALIDATE_NEED:
7366                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7367                 fallthrough;
7368         case NFT_VALIDATE_DO:
7369                 list_for_each_entry(table, &net->nft.tables, list) {
7370                         if (nft_table_validate(net, table) < 0)
7371                                 return -EAGAIN;
7372                 }
7373                 break;
7374         }
7375
7376         return 0;
7377 }
7378
7379 /* a drop policy has to be deferred until all rules have been activated,
7380  * otherwise a large ruleset that contains a drop-policy base chain will
7381  * cause all packets to get dropped until the full transaction has been
7382  * processed.
7383  *
7384  * We defer the drop policy until the transaction has been finalized.
7385  */
7386 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7387 {
7388         struct nft_base_chain *basechain;
7389
7390         if (nft_trans_chain_policy(trans) != NF_DROP)
7391                 return;
7392
7393         if (!nft_is_base_chain(trans->ctx.chain))
7394                 return;
7395
7396         basechain = nft_base_chain(trans->ctx.chain);
7397         basechain->policy = NF_DROP;
7398 }
7399
7400 static void nft_chain_commit_update(struct nft_trans *trans)
7401 {
7402         struct nft_base_chain *basechain;
7403
7404         if (nft_trans_chain_name(trans)) {
7405                 rhltable_remove(&trans->ctx.table->chains_ht,
7406                                 &trans->ctx.chain->rhlhead,
7407                                 nft_chain_ht_params);
7408                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7409                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7410                                     trans->ctx.chain->name,
7411                                     &trans->ctx.chain->rhlhead,
7412                                     nft_chain_ht_params);
7413         }
7414
7415         if (!nft_is_base_chain(trans->ctx.chain))
7416                 return;
7417
7418         nft_chain_stats_replace(trans);
7419
7420         basechain = nft_base_chain(trans->ctx.chain);
7421
7422         switch (nft_trans_chain_policy(trans)) {
7423         case NF_DROP:
7424         case NF_ACCEPT:
7425                 basechain->policy = nft_trans_chain_policy(trans);
7426                 break;
7427         }
7428 }
7429
7430 static void nft_obj_commit_update(struct nft_trans *trans)
7431 {
7432         struct nft_object *newobj;
7433         struct nft_object *obj;
7434
7435         obj = nft_trans_obj(trans);
7436         newobj = nft_trans_obj_newobj(trans);
7437
7438         if (obj->ops->update)
7439                 obj->ops->update(obj, newobj);
7440
7441         kfree(newobj);
7442 }
7443
7444 static void nft_commit_release(struct nft_trans *trans)
7445 {
7446         switch (trans->msg_type) {
7447         case NFT_MSG_DELTABLE:
7448                 nf_tables_table_destroy(&trans->ctx);
7449                 break;
7450         case NFT_MSG_NEWCHAIN:
7451                 free_percpu(nft_trans_chain_stats(trans));
7452                 kfree(nft_trans_chain_name(trans));
7453                 break;
7454         case NFT_MSG_DELCHAIN:
7455                 nf_tables_chain_destroy(&trans->ctx);
7456                 break;
7457         case NFT_MSG_DELRULE:
7458                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7459                 break;
7460         case NFT_MSG_DELSET:
7461                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7462                 break;
7463         case NFT_MSG_DELSETELEM:
7464                 nf_tables_set_elem_destroy(&trans->ctx,
7465                                            nft_trans_elem_set(trans),
7466                                            nft_trans_elem(trans).priv);
7467                 break;
7468         case NFT_MSG_DELOBJ:
7469                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7470                 break;
7471         case NFT_MSG_DELFLOWTABLE:
7472                 if (nft_trans_flowtable_update(trans))
7473                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7474                 else
7475                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7476                 break;
7477         }
7478
7479         if (trans->put_net)
7480                 put_net(trans->ctx.net);
7481
7482         kfree(trans);
7483 }
7484
7485 static void nf_tables_trans_destroy_work(struct work_struct *w)
7486 {
7487         struct nft_trans *trans, *next;
7488         LIST_HEAD(head);
7489
7490         spin_lock(&nf_tables_destroy_list_lock);
7491         list_splice_init(&nf_tables_destroy_list, &head);
7492         spin_unlock(&nf_tables_destroy_list_lock);
7493
7494         if (list_empty(&head))
7495                 return;
7496
7497         synchronize_rcu();
7498
7499         list_for_each_entry_safe(trans, next, &head, list) {
7500                 list_del(&trans->list);
7501                 nft_commit_release(trans);
7502         }
7503 }
7504
7505 void nf_tables_trans_destroy_flush_work(void)
7506 {
7507         flush_work(&trans_destroy_work);
7508 }
7509 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7510
7511 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7512 {
7513         struct nft_rule *rule;
7514         unsigned int alloc = 0;
7515         int i;
7516
7517         /* already handled or inactive chain? */
7518         if (chain->rules_next || !nft_is_active_next(net, chain))
7519                 return 0;
7520
7521         rule = list_entry(&chain->rules, struct nft_rule, list);
7522         i = 0;
7523
7524         list_for_each_entry_continue(rule, &chain->rules, list) {
7525                 if (nft_is_active_next(net, rule))
7526                         alloc++;
7527         }
7528
7529         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7530         if (!chain->rules_next)
7531                 return -ENOMEM;
7532
7533         list_for_each_entry_continue(rule, &chain->rules, list) {
7534                 if (nft_is_active_next(net, rule))
7535                         chain->rules_next[i++] = rule;
7536         }
7537
7538         chain->rules_next[i] = NULL;
7539         return 0;
7540 }
7541
7542 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7543 {
7544         struct nft_trans *trans, *next;
7545
7546         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7547                 struct nft_chain *chain = trans->ctx.chain;
7548
7549                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7550                     trans->msg_type == NFT_MSG_DELRULE) {
7551                         kvfree(chain->rules_next);
7552                         chain->rules_next = NULL;
7553                 }
7554         }
7555 }
7556
7557 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7558 {
7559         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7560
7561         kvfree(o->start);
7562 }
7563
7564 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7565 {
7566         struct nft_rule **r = rules;
7567         struct nft_rules_old *old;
7568
7569         while (*r)
7570                 r++;
7571
7572         r++;    /* rcu_head is after end marker */
7573         old = (void *) r;
7574         old->start = rules;
7575
7576         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7577 }
7578
7579 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7580 {
7581         struct nft_rule **g0, **g1;
7582         bool next_genbit;
7583
7584         next_genbit = nft_gencursor_next(net);
7585
7586         g0 = rcu_dereference_protected(chain->rules_gen_0,
7587                                        lockdep_commit_lock_is_held(net));
7588         g1 = rcu_dereference_protected(chain->rules_gen_1,
7589                                        lockdep_commit_lock_is_held(net));
7590
7591         /* No changes to this chain? */
7592         if (chain->rules_next == NULL) {
7593                 /* chain had no change in last or next generation */
7594                 if (g0 == g1)
7595                         return;
7596                 /*
7597                  * chain had no change in this generation; make sure next
7598                  * one uses same rules as current generation.
7599                  */
7600                 if (next_genbit) {
7601                         rcu_assign_pointer(chain->rules_gen_1, g0);
7602                         nf_tables_commit_chain_free_rules_old(g1);
7603                 } else {
7604                         rcu_assign_pointer(chain->rules_gen_0, g1);
7605                         nf_tables_commit_chain_free_rules_old(g0);
7606                 }
7607
7608                 return;
7609         }
7610
7611         if (next_genbit)
7612                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7613         else
7614                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7615
7616         chain->rules_next = NULL;
7617
7618         if (g0 == g1)
7619                 return;
7620
7621         if (next_genbit)
7622                 nf_tables_commit_chain_free_rules_old(g1);
7623         else
7624                 nf_tables_commit_chain_free_rules_old(g0);
7625 }
7626
7627 static void nft_obj_del(struct nft_object *obj)
7628 {
7629         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7630         list_del_rcu(&obj->list);
7631 }
7632
7633 void nft_chain_del(struct nft_chain *chain)
7634 {
7635         struct nft_table *table = chain->table;
7636
7637         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7638                                      nft_chain_ht_params));
7639         list_del_rcu(&chain->list);
7640 }
7641
7642 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7643                                     struct list_head *hook_list)
7644 {
7645         struct nft_hook *hook, *next;
7646
7647         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7648                 if (hook->inactive)
7649                         list_move(&hook->list, hook_list);
7650         }
7651 }
7652
7653 static void nf_tables_module_autoload_cleanup(struct net *net)
7654 {
7655         struct nft_module_request *req, *next;
7656
7657         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7658         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7659                 WARN_ON_ONCE(!req->done);
7660                 list_del(&req->list);
7661                 kfree(req);
7662         }
7663 }
7664
7665 static void nf_tables_commit_release(struct net *net)
7666 {
7667         struct nft_trans *trans;
7668
7669         /* all side effects have to be made visible.
7670          * For example, if a chain named 'foo' has been deleted, a
7671          * new transaction must not find it anymore.
7672          *
7673          * Memory reclaim happens asynchronously from work queue
7674          * to prevent expensive synchronize_rcu() in commit phase.
7675          */
7676         if (list_empty(&net->nft.commit_list)) {
7677                 nf_tables_module_autoload_cleanup(net);
7678                 mutex_unlock(&net->nft.commit_mutex);
7679                 return;
7680         }
7681
7682         trans = list_last_entry(&net->nft.commit_list,
7683                                 struct nft_trans, list);
7684         get_net(trans->ctx.net);
7685         WARN_ON_ONCE(trans->put_net);
7686
7687         trans->put_net = true;
7688         spin_lock(&nf_tables_destroy_list_lock);
7689         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7690         spin_unlock(&nf_tables_destroy_list_lock);
7691
7692         nf_tables_module_autoload_cleanup(net);
7693         schedule_work(&trans_destroy_work);
7694
7695         mutex_unlock(&net->nft.commit_mutex);
7696 }
7697
7698 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7699 {
7700         struct nft_trans *trans, *next;
7701         struct nft_trans_elem *te;
7702         struct nft_chain *chain;
7703         struct nft_table *table;
7704         int err;
7705
7706         if (list_empty(&net->nft.commit_list)) {
7707                 mutex_unlock(&net->nft.commit_mutex);
7708                 return 0;
7709         }
7710
7711         /* 0. Validate ruleset, otherwise roll back for error reporting. */
7712         if (nf_tables_validate(net) < 0)
7713                 return -EAGAIN;
7714
7715         err = nft_flow_rule_offload_commit(net);
7716         if (err < 0)
7717                 return err;
7718
7719         /* 1.  Allocate space for next generation rules_gen_X[] */
7720         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7721                 int ret;
7722
7723                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7724                     trans->msg_type == NFT_MSG_DELRULE) {
7725                         chain = trans->ctx.chain;
7726
7727                         ret = nf_tables_commit_chain_prepare(net, chain);
7728                         if (ret < 0) {
7729                                 nf_tables_commit_chain_prepare_cancel(net);
7730                                 return ret;
7731                         }
7732                 }
7733         }
7734
7735         /* step 2.  Make rules_gen_X visible to packet path */
7736         list_for_each_entry(table, &net->nft.tables, list) {
7737                 list_for_each_entry(chain, &table->chains, list)
7738                         nf_tables_commit_chain(net, chain);
7739         }
7740
7741         /*
7742          * Bump generation counter, invalidate any dump in progress.
7743          * Cannot fail after this point.
7744          */
7745         while (++net->nft.base_seq == 0);
7746
7747         /* step 3. Start new generation, rules_gen_X now in use. */
7748         net->nft.gencursor = nft_gencursor_next(net);
7749
7750         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7751                 switch (trans->msg_type) {
7752                 case NFT_MSG_NEWTABLE:
7753                         if (nft_trans_table_update(trans)) {
7754                                 if (!nft_trans_table_enable(trans)) {
7755                                         nf_tables_table_disable(net,
7756                                                                 trans->ctx.table);
7757                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7758                                 }
7759                         } else {
7760                                 nft_clear(net, trans->ctx.table);
7761                         }
7762                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7763                         nft_trans_destroy(trans);
7764                         break;
7765                 case NFT_MSG_DELTABLE:
7766                         list_del_rcu(&trans->ctx.table->list);
7767                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7768                         break;
7769                 case NFT_MSG_NEWCHAIN:
7770                         if (nft_trans_chain_update(trans)) {
7771                                 nft_chain_commit_update(trans);
7772                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7773                                 /* trans destroyed after rcu grace period */
7774                         } else {
7775                                 nft_chain_commit_drop_policy(trans);
7776                                 nft_clear(net, trans->ctx.chain);
7777                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7778                                 nft_trans_destroy(trans);
7779                         }
7780                         break;
7781                 case NFT_MSG_DELCHAIN:
7782                         nft_chain_del(trans->ctx.chain);
7783                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7784                         nf_tables_unregister_hook(trans->ctx.net,
7785                                                   trans->ctx.table,
7786                                                   trans->ctx.chain);
7787                         break;
7788                 case NFT_MSG_NEWRULE:
7789                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
7790                         nf_tables_rule_notify(&trans->ctx,
7791                                               nft_trans_rule(trans),
7792                                               NFT_MSG_NEWRULE);
7793                         nft_trans_destroy(trans);
7794                         break;
7795                 case NFT_MSG_DELRULE:
7796                         list_del_rcu(&nft_trans_rule(trans)->list);
7797                         nf_tables_rule_notify(&trans->ctx,
7798                                               nft_trans_rule(trans),
7799                                               NFT_MSG_DELRULE);
7800                         nft_rule_expr_deactivate(&trans->ctx,
7801                                                  nft_trans_rule(trans),
7802                                                  NFT_TRANS_COMMIT);
7803                         break;
7804                 case NFT_MSG_NEWSET:
7805                         nft_clear(net, nft_trans_set(trans));
7806                         /* This avoids hitting -EBUSY when deleting the table
7807                          * from the transaction.
7808                          */
7809                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7810                             !list_empty(&nft_trans_set(trans)->bindings))
7811                                 trans->ctx.table->use--;
7812
7813                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7814                                              NFT_MSG_NEWSET, GFP_KERNEL);
7815                         nft_trans_destroy(trans);
7816                         break;
7817                 case NFT_MSG_DELSET:
7818                         list_del_rcu(&nft_trans_set(trans)->list);
7819                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7820                                              NFT_MSG_DELSET, GFP_KERNEL);
7821                         break;
7822                 case NFT_MSG_NEWSETELEM:
7823                         te = (struct nft_trans_elem *)trans->data;
7824
7825                         te->set->ops->activate(net, te->set, &te->elem);
7826                         nf_tables_setelem_notify(&trans->ctx, te->set,
7827                                                  &te->elem,
7828                                                  NFT_MSG_NEWSETELEM, 0);
7829                         nft_trans_destroy(trans);
7830                         break;
7831                 case NFT_MSG_DELSETELEM:
7832                         te = (struct nft_trans_elem *)trans->data;
7833
7834                         nf_tables_setelem_notify(&trans->ctx, te->set,
7835                                                  &te->elem,
7836                                                  NFT_MSG_DELSETELEM, 0);
7837                         te->set->ops->remove(net, te->set, &te->elem);
7838                         atomic_dec(&te->set->nelems);
7839                         te->set->ndeact--;
7840                         break;
7841                 case NFT_MSG_NEWOBJ:
7842                         if (nft_trans_obj_update(trans)) {
7843                                 nft_obj_commit_update(trans);
7844                                 nf_tables_obj_notify(&trans->ctx,
7845                                                      nft_trans_obj(trans),
7846                                                      NFT_MSG_NEWOBJ);
7847                         } else {
7848                                 nft_clear(net, nft_trans_obj(trans));
7849                                 nf_tables_obj_notify(&trans->ctx,
7850                                                      nft_trans_obj(trans),
7851                                                      NFT_MSG_NEWOBJ);
7852                                 nft_trans_destroy(trans);
7853                         }
7854                         break;
7855                 case NFT_MSG_DELOBJ:
7856                         nft_obj_del(nft_trans_obj(trans));
7857                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7858                                              NFT_MSG_DELOBJ);
7859                         break;
7860                 case NFT_MSG_NEWFLOWTABLE:
7861                         if (nft_trans_flowtable_update(trans)) {
7862                                 nf_tables_flowtable_notify(&trans->ctx,
7863                                                            nft_trans_flowtable(trans),
7864                                                            &nft_trans_flowtable_hooks(trans),
7865                                                            NFT_MSG_NEWFLOWTABLE);
7866                                 list_splice(&nft_trans_flowtable_hooks(trans),
7867                                             &nft_trans_flowtable(trans)->hook_list);
7868                         } else {
7869                                 nft_clear(net, nft_trans_flowtable(trans));
7870                                 nf_tables_flowtable_notify(&trans->ctx,
7871                                                            nft_trans_flowtable(trans),
7872                                                            &nft_trans_flowtable(trans)->hook_list,
7873                                                            NFT_MSG_NEWFLOWTABLE);
7874                         }
7875                         nft_trans_destroy(trans);
7876                         break;
7877                 case NFT_MSG_DELFLOWTABLE:
7878                         if (nft_trans_flowtable_update(trans)) {
7879                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
7880                                                         &nft_trans_flowtable_hooks(trans));
7881                                 nf_tables_flowtable_notify(&trans->ctx,
7882                                                            nft_trans_flowtable(trans),
7883                                                            &nft_trans_flowtable_hooks(trans),
7884                                                            NFT_MSG_DELFLOWTABLE);
7885                                 nft_unregister_flowtable_net_hooks(net,
7886                                                                    &nft_trans_flowtable_hooks(trans));
7887                         } else {
7888                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
7889                                 nf_tables_flowtable_notify(&trans->ctx,
7890                                                            nft_trans_flowtable(trans),
7891                                                            &nft_trans_flowtable(trans)->hook_list,
7892                                                            NFT_MSG_DELFLOWTABLE);
7893                                 nft_unregister_flowtable_net_hooks(net,
7894                                                 &nft_trans_flowtable(trans)->hook_list);
7895                         }
7896                         break;
7897                 }
7898         }
7899
7900         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
7901         nf_tables_commit_release(net);
7902
7903         return 0;
7904 }
7905
7906 static void nf_tables_module_autoload(struct net *net)
7907 {
7908         struct nft_module_request *req, *next;
7909         LIST_HEAD(module_list);
7910
7911         list_splice_init(&net->nft.module_list, &module_list);
7912         mutex_unlock(&net->nft.commit_mutex);
7913         list_for_each_entry_safe(req, next, &module_list, list) {
7914                 request_module("%s", req->module);
7915                 req->done = true;
7916         }
7917         mutex_lock(&net->nft.commit_mutex);
7918         list_splice(&module_list, &net->nft.module_list);
7919 }
7920
7921 static void nf_tables_abort_release(struct nft_trans *trans)
7922 {
7923         switch (trans->msg_type) {
7924         case NFT_MSG_NEWTABLE:
7925                 nf_tables_table_destroy(&trans->ctx);
7926                 break;
7927         case NFT_MSG_NEWCHAIN:
7928                 nf_tables_chain_destroy(&trans->ctx);
7929                 break;
7930         case NFT_MSG_NEWRULE:
7931                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7932                 break;
7933         case NFT_MSG_NEWSET:
7934                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7935                 break;
7936         case NFT_MSG_NEWSETELEM:
7937                 nft_set_elem_destroy(nft_trans_elem_set(trans),
7938                                      nft_trans_elem(trans).priv, true);
7939                 break;
7940         case NFT_MSG_NEWOBJ:
7941                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7942                 break;
7943         case NFT_MSG_NEWFLOWTABLE:
7944                 if (nft_trans_flowtable_update(trans))
7945                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7946                 else
7947                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7948                 break;
7949         }
7950         kfree(trans);
7951 }
7952
7953 static int __nf_tables_abort(struct net *net, bool autoload)
7954 {
7955         struct nft_trans *trans, *next;
7956         struct nft_trans_elem *te;
7957         struct nft_hook *hook;
7958
7959         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
7960                                          list) {
7961                 switch (trans->msg_type) {
7962                 case NFT_MSG_NEWTABLE:
7963                         if (nft_trans_table_update(trans)) {
7964                                 if (nft_trans_table_enable(trans)) {
7965                                         nf_tables_table_disable(net,
7966                                                                 trans->ctx.table);
7967                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7968                                 }
7969                                 nft_trans_destroy(trans);
7970                         } else {
7971                                 list_del_rcu(&trans->ctx.table->list);
7972                         }
7973                         break;
7974                 case NFT_MSG_DELTABLE:
7975                         nft_clear(trans->ctx.net, trans->ctx.table);
7976                         nft_trans_destroy(trans);
7977                         break;
7978                 case NFT_MSG_NEWCHAIN:
7979                         if (nft_trans_chain_update(trans)) {
7980                                 free_percpu(nft_trans_chain_stats(trans));
7981                                 kfree(nft_trans_chain_name(trans));
7982                                 nft_trans_destroy(trans);
7983                         } else {
7984                                 if (nft_chain_is_bound(trans->ctx.chain)) {
7985                                         nft_trans_destroy(trans);
7986                                         break;
7987                                 }
7988                                 trans->ctx.table->use--;
7989                                 nft_chain_del(trans->ctx.chain);
7990                                 nf_tables_unregister_hook(trans->ctx.net,
7991                                                           trans->ctx.table,
7992                                                           trans->ctx.chain);
7993                         }
7994                         break;
7995                 case NFT_MSG_DELCHAIN:
7996                         trans->ctx.table->use++;
7997                         nft_clear(trans->ctx.net, trans->ctx.chain);
7998                         nft_trans_destroy(trans);
7999                         break;
8000                 case NFT_MSG_NEWRULE:
8001                         trans->ctx.chain->use--;
8002                         list_del_rcu(&nft_trans_rule(trans)->list);
8003                         nft_rule_expr_deactivate(&trans->ctx,
8004                                                  nft_trans_rule(trans),
8005                                                  NFT_TRANS_ABORT);
8006                         break;
8007                 case NFT_MSG_DELRULE:
8008                         trans->ctx.chain->use++;
8009                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8010                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8011                         nft_trans_destroy(trans);
8012                         break;
8013                 case NFT_MSG_NEWSET:
8014                         trans->ctx.table->use--;
8015                         if (nft_trans_set_bound(trans)) {
8016                                 nft_trans_destroy(trans);
8017                                 break;
8018                         }
8019                         list_del_rcu(&nft_trans_set(trans)->list);
8020                         break;
8021                 case NFT_MSG_DELSET:
8022                         trans->ctx.table->use++;
8023                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8024                         nft_trans_destroy(trans);
8025                         break;
8026                 case NFT_MSG_NEWSETELEM:
8027                         if (nft_trans_elem_set_bound(trans)) {
8028                                 nft_trans_destroy(trans);
8029                                 break;
8030                         }
8031                         te = (struct nft_trans_elem *)trans->data;
8032                         te->set->ops->remove(net, te->set, &te->elem);
8033                         atomic_dec(&te->set->nelems);
8034                         break;
8035                 case NFT_MSG_DELSETELEM:
8036                         te = (struct nft_trans_elem *)trans->data;
8037
8038                         nft_set_elem_activate(net, te->set, &te->elem);
8039                         te->set->ops->activate(net, te->set, &te->elem);
8040                         te->set->ndeact--;
8041
8042                         nft_trans_destroy(trans);
8043                         break;
8044                 case NFT_MSG_NEWOBJ:
8045                         if (nft_trans_obj_update(trans)) {
8046                                 kfree(nft_trans_obj_newobj(trans));
8047                                 nft_trans_destroy(trans);
8048                         } else {
8049                                 trans->ctx.table->use--;
8050                                 nft_obj_del(nft_trans_obj(trans));
8051                         }
8052                         break;
8053                 case NFT_MSG_DELOBJ:
8054                         trans->ctx.table->use++;
8055                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8056                         nft_trans_destroy(trans);
8057                         break;
8058                 case NFT_MSG_NEWFLOWTABLE:
8059                         if (nft_trans_flowtable_update(trans)) {
8060                                 nft_unregister_flowtable_net_hooks(net,
8061                                                 &nft_trans_flowtable_hooks(trans));
8062                         } else {
8063                                 trans->ctx.table->use--;
8064                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8065                                 nft_unregister_flowtable_net_hooks(net,
8066                                                 &nft_trans_flowtable(trans)->hook_list);
8067                         }
8068                         break;
8069                 case NFT_MSG_DELFLOWTABLE:
8070                         if (nft_trans_flowtable_update(trans)) {
8071                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8072                                         hook->inactive = false;
8073                         } else {
8074                                 trans->ctx.table->use++;
8075                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8076                         }
8077                         nft_trans_destroy(trans);
8078                         break;
8079                 }
8080         }
8081
8082         synchronize_rcu();
8083
8084         list_for_each_entry_safe_reverse(trans, next,
8085                                          &net->nft.commit_list, list) {
8086                 list_del(&trans->list);
8087                 nf_tables_abort_release(trans);
8088         }
8089
8090         if (autoload)
8091                 nf_tables_module_autoload(net);
8092         else
8093                 nf_tables_module_autoload_cleanup(net);
8094
8095         return 0;
8096 }
8097
8098 static void nf_tables_cleanup(struct net *net)
8099 {
8100         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8101 }
8102
8103 static int nf_tables_abort(struct net *net, struct sk_buff *skb, bool autoload)
8104 {
8105         int ret = __nf_tables_abort(net, autoload);
8106
8107         mutex_unlock(&net->nft.commit_mutex);
8108
8109         return ret;
8110 }
8111
8112 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8113 {
8114         bool genid_ok;
8115
8116         mutex_lock(&net->nft.commit_mutex);
8117
8118         genid_ok = genid == 0 || net->nft.base_seq == genid;
8119         if (!genid_ok)
8120                 mutex_unlock(&net->nft.commit_mutex);
8121
8122         /* else, commit mutex has to be released by commit or abort function */
8123         return genid_ok;
8124 }
8125
8126 static const struct nfnetlink_subsystem nf_tables_subsys = {
8127         .name           = "nf_tables",
8128         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8129         .cb_count       = NFT_MSG_MAX,
8130         .cb             = nf_tables_cb,
8131         .commit         = nf_tables_commit,
8132         .abort          = nf_tables_abort,
8133         .cleanup        = nf_tables_cleanup,
8134         .valid_genid    = nf_tables_valid_genid,
8135         .owner          = THIS_MODULE,
8136 };
8137
8138 int nft_chain_validate_dependency(const struct nft_chain *chain,
8139                                   enum nft_chain_types type)
8140 {
8141         const struct nft_base_chain *basechain;
8142
8143         if (nft_is_base_chain(chain)) {
8144                 basechain = nft_base_chain(chain);
8145                 if (basechain->type->type != type)
8146                         return -EOPNOTSUPP;
8147         }
8148         return 0;
8149 }
8150 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8151
8152 int nft_chain_validate_hooks(const struct nft_chain *chain,
8153                              unsigned int hook_flags)
8154 {
8155         struct nft_base_chain *basechain;
8156
8157         if (nft_is_base_chain(chain)) {
8158                 basechain = nft_base_chain(chain);
8159
8160                 if ((1 << basechain->ops.hooknum) & hook_flags)
8161                         return 0;
8162
8163                 return -EOPNOTSUPP;
8164         }
8165
8166         return 0;
8167 }
8168 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8169
8170 /*
8171  * Loop detection - walk through the ruleset beginning at the destination chain
8172  * of a new jump until either the source chain is reached (loop) or all
8173  * reachable chains have been traversed.
8174  *
8175  * The loop check is performed whenever a new jump verdict is added to an
8176  * expression or verdict map or a verdict map is bound to a new chain.
8177  */
8178
8179 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8180                                  const struct nft_chain *chain);
8181
8182 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8183                                         struct nft_set *set,
8184                                         const struct nft_set_iter *iter,
8185                                         struct nft_set_elem *elem)
8186 {
8187         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8188         const struct nft_data *data;
8189
8190         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8191             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8192                 return 0;
8193
8194         data = nft_set_ext_data(ext);
8195         switch (data->verdict.code) {
8196         case NFT_JUMP:
8197         case NFT_GOTO:
8198                 return nf_tables_check_loops(ctx, data->verdict.chain);
8199         default:
8200                 return 0;
8201         }
8202 }
8203
8204 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8205                                  const struct nft_chain *chain)
8206 {
8207         const struct nft_rule *rule;
8208         const struct nft_expr *expr, *last;
8209         struct nft_set *set;
8210         struct nft_set_binding *binding;
8211         struct nft_set_iter iter;
8212
8213         if (ctx->chain == chain)
8214                 return -ELOOP;
8215
8216         list_for_each_entry(rule, &chain->rules, list) {
8217                 nft_rule_for_each_expr(expr, last, rule) {
8218                         struct nft_immediate_expr *priv;
8219                         const struct nft_data *data;
8220                         int err;
8221
8222                         if (strcmp(expr->ops->type->name, "immediate"))
8223                                 continue;
8224
8225                         priv = nft_expr_priv(expr);
8226                         if (priv->dreg != NFT_REG_VERDICT)
8227                                 continue;
8228
8229                         data = &priv->data;
8230                         switch (data->verdict.code) {
8231                         case NFT_JUMP:
8232                         case NFT_GOTO:
8233                                 err = nf_tables_check_loops(ctx,
8234                                                         data->verdict.chain);
8235                                 if (err < 0)
8236                                         return err;
8237                         default:
8238                                 break;
8239                         }
8240                 }
8241         }
8242
8243         list_for_each_entry(set, &ctx->table->sets, list) {
8244                 if (!nft_is_active_next(ctx->net, set))
8245                         continue;
8246                 if (!(set->flags & NFT_SET_MAP) ||
8247                     set->dtype != NFT_DATA_VERDICT)
8248                         continue;
8249
8250                 list_for_each_entry(binding, &set->bindings, list) {
8251                         if (!(binding->flags & NFT_SET_MAP) ||
8252                             binding->chain != chain)
8253                                 continue;
8254
8255                         iter.genmask    = nft_genmask_next(ctx->net);
8256                         iter.skip       = 0;
8257                         iter.count      = 0;
8258                         iter.err        = 0;
8259                         iter.fn         = nf_tables_loop_check_setelem;
8260
8261                         set->ops->walk(ctx, set, &iter);
8262                         if (iter.err < 0)
8263                                 return iter.err;
8264                 }
8265         }
8266
8267         return 0;
8268 }
8269
8270 /**
8271  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8272  *
8273  *      @attr: netlink attribute to fetch value from
8274  *      @max: maximum value to be stored in dest
8275  *      @dest: pointer to the variable
8276  *
8277  *      Parse, check and store a given u32 netlink attribute into variable.
8278  *      This function returns -ERANGE if the value goes over maximum value.
8279  *      Otherwise a 0 is returned and the attribute value is stored in the
8280  *      destination variable.
8281  */
8282 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8283 {
8284         u32 val;
8285
8286         val = ntohl(nla_get_be32(attr));
8287         if (val > max)
8288                 return -ERANGE;
8289
8290         *dest = val;
8291         return 0;
8292 }
8293 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8294
8295 /**
8296  *      nft_parse_register - parse a register value from a netlink attribute
8297  *
8298  *      @attr: netlink attribute
8299  *
8300  *      Parse and translate a register value from a netlink attribute.
8301  *      Registers used to be 128 bit wide, these register numbers will be
8302  *      mapped to the corresponding 32 bit register numbers.
8303  */
8304 unsigned int nft_parse_register(const struct nlattr *attr)
8305 {
8306         unsigned int reg;
8307
8308         reg = ntohl(nla_get_be32(attr));
8309         switch (reg) {
8310         case NFT_REG_VERDICT...NFT_REG_4:
8311                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8312         default:
8313                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8314         }
8315 }
8316 EXPORT_SYMBOL_GPL(nft_parse_register);
8317
8318 /**
8319  *      nft_dump_register - dump a register value to a netlink attribute
8320  *
8321  *      @skb: socket buffer
8322  *      @attr: attribute number
8323  *      @reg: register number
8324  *
8325  *      Construct a netlink attribute containing the register number. For
8326  *      compatibility reasons, register numbers being a multiple of 4 are
8327  *      translated to the corresponding 128 bit register numbers.
8328  */
8329 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8330 {
8331         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8332                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8333         else
8334                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8335
8336         return nla_put_be32(skb, attr, htonl(reg));
8337 }
8338 EXPORT_SYMBOL_GPL(nft_dump_register);
8339
8340 /**
8341  *      nft_validate_register_load - validate a load from a register
8342  *
8343  *      @reg: the register number
8344  *      @len: the length of the data
8345  *
8346  *      Validate that the input register is one of the general purpose
8347  *      registers and that the length of the load is within the bounds.
8348  */
8349 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8350 {
8351         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8352                 return -EINVAL;
8353         if (len == 0)
8354                 return -EINVAL;
8355         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8356                 return -ERANGE;
8357
8358         return 0;
8359 }
8360 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8361
8362 /**
8363  *      nft_validate_register_store - validate an expressions' register store
8364  *
8365  *      @ctx: context of the expression performing the load
8366  *      @reg: the destination register number
8367  *      @data: the data to load
8368  *      @type: the data type
8369  *      @len: the length of the data
8370  *
8371  *      Validate that a data load uses the appropriate data type for
8372  *      the destination register and the length is within the bounds.
8373  *      A value of NULL for the data means that its runtime gathered
8374  *      data.
8375  */
8376 int nft_validate_register_store(const struct nft_ctx *ctx,
8377                                 enum nft_registers reg,
8378                                 const struct nft_data *data,
8379                                 enum nft_data_types type, unsigned int len)
8380 {
8381         int err;
8382
8383         switch (reg) {
8384         case NFT_REG_VERDICT:
8385                 if (type != NFT_DATA_VERDICT)
8386                         return -EINVAL;
8387
8388                 if (data != NULL &&
8389                     (data->verdict.code == NFT_GOTO ||
8390                      data->verdict.code == NFT_JUMP)) {
8391                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8392                         if (err < 0)
8393                                 return err;
8394                 }
8395
8396                 return 0;
8397         default:
8398                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8399                         return -EINVAL;
8400                 if (len == 0)
8401                         return -EINVAL;
8402                 if (reg * NFT_REG32_SIZE + len >
8403                     sizeof_field(struct nft_regs, data))
8404                         return -ERANGE;
8405
8406                 if (data != NULL && type != NFT_DATA_VALUE)
8407                         return -EINVAL;
8408                 return 0;
8409         }
8410 }
8411 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8412
8413 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8414         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8415         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8416                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8417         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8418 };
8419
8420 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8421                             struct nft_data_desc *desc, const struct nlattr *nla)
8422 {
8423         u8 genmask = nft_genmask_next(ctx->net);
8424         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8425         struct nft_chain *chain;
8426         int err;
8427
8428         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8429                                           nft_verdict_policy, NULL);
8430         if (err < 0)
8431                 return err;
8432
8433         if (!tb[NFTA_VERDICT_CODE])
8434                 return -EINVAL;
8435         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8436
8437         switch (data->verdict.code) {
8438         default:
8439                 switch (data->verdict.code & NF_VERDICT_MASK) {
8440                 case NF_ACCEPT:
8441                 case NF_DROP:
8442                 case NF_QUEUE:
8443                         break;
8444                 default:
8445                         return -EINVAL;
8446                 }
8447                 fallthrough;
8448         case NFT_CONTINUE:
8449         case NFT_BREAK:
8450         case NFT_RETURN:
8451                 break;
8452         case NFT_JUMP:
8453         case NFT_GOTO:
8454                 if (tb[NFTA_VERDICT_CHAIN]) {
8455                         chain = nft_chain_lookup(ctx->net, ctx->table,
8456                                                  tb[NFTA_VERDICT_CHAIN],
8457                                                  genmask);
8458                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8459                         chain = nft_chain_lookup_byid(ctx->net,
8460                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8461                         if (IS_ERR(chain))
8462                                 return PTR_ERR(chain);
8463                 } else {
8464                         return -EINVAL;
8465                 }
8466
8467                 if (IS_ERR(chain))
8468                         return PTR_ERR(chain);
8469                 if (nft_is_base_chain(chain))
8470                         return -EOPNOTSUPP;
8471
8472                 chain->use++;
8473                 data->verdict.chain = chain;
8474                 break;
8475         }
8476
8477         desc->len = sizeof(data->verdict);
8478         desc->type = NFT_DATA_VERDICT;
8479         return 0;
8480 }
8481
8482 static void nft_verdict_uninit(const struct nft_data *data)
8483 {
8484         struct nft_chain *chain;
8485         struct nft_rule *rule;
8486
8487         switch (data->verdict.code) {
8488         case NFT_JUMP:
8489         case NFT_GOTO:
8490                 chain = data->verdict.chain;
8491                 chain->use--;
8492
8493                 if (!nft_chain_is_bound(chain))
8494                         break;
8495
8496                 chain->table->use--;
8497                 list_for_each_entry(rule, &chain->rules, list)
8498                         chain->use--;
8499
8500                 nft_chain_del(chain);
8501                 break;
8502         }
8503 }
8504
8505 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8506 {
8507         struct nlattr *nest;
8508
8509         nest = nla_nest_start_noflag(skb, type);
8510         if (!nest)
8511                 goto nla_put_failure;
8512
8513         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8514                 goto nla_put_failure;
8515
8516         switch (v->code) {
8517         case NFT_JUMP:
8518         case NFT_GOTO:
8519                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8520                                    v->chain->name))
8521                         goto nla_put_failure;
8522         }
8523         nla_nest_end(skb, nest);
8524         return 0;
8525
8526 nla_put_failure:
8527         return -1;
8528 }
8529
8530 static int nft_value_init(const struct nft_ctx *ctx,
8531                           struct nft_data *data, unsigned int size,
8532                           struct nft_data_desc *desc, const struct nlattr *nla)
8533 {
8534         unsigned int len;
8535
8536         len = nla_len(nla);
8537         if (len == 0)
8538                 return -EINVAL;
8539         if (len > size)
8540                 return -EOVERFLOW;
8541
8542         nla_memcpy(data->data, nla, len);
8543         desc->type = NFT_DATA_VALUE;
8544         desc->len  = len;
8545         return 0;
8546 }
8547
8548 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8549                           unsigned int len)
8550 {
8551         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8552 }
8553
8554 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8555         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8556         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8557 };
8558
8559 /**
8560  *      nft_data_init - parse nf_tables data netlink attributes
8561  *
8562  *      @ctx: context of the expression using the data
8563  *      @data: destination struct nft_data
8564  *      @size: maximum data length
8565  *      @desc: data description
8566  *      @nla: netlink attribute containing data
8567  *
8568  *      Parse the netlink data attributes and initialize a struct nft_data.
8569  *      The type and length of data are returned in the data description.
8570  *
8571  *      The caller can indicate that it only wants to accept data of type
8572  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8573  */
8574 int nft_data_init(const struct nft_ctx *ctx,
8575                   struct nft_data *data, unsigned int size,
8576                   struct nft_data_desc *desc, const struct nlattr *nla)
8577 {
8578         struct nlattr *tb[NFTA_DATA_MAX + 1];
8579         int err;
8580
8581         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8582                                           nft_data_policy, NULL);
8583         if (err < 0)
8584                 return err;
8585
8586         if (tb[NFTA_DATA_VALUE])
8587                 return nft_value_init(ctx, data, size, desc,
8588                                       tb[NFTA_DATA_VALUE]);
8589         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8590                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8591         return -EINVAL;
8592 }
8593 EXPORT_SYMBOL_GPL(nft_data_init);
8594
8595 /**
8596  *      nft_data_release - release a nft_data item
8597  *
8598  *      @data: struct nft_data to release
8599  *      @type: type of data
8600  *
8601  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8602  *      all others need to be released by calling this function.
8603  */
8604 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8605 {
8606         if (type < NFT_DATA_VERDICT)
8607                 return;
8608         switch (type) {
8609         case NFT_DATA_VERDICT:
8610                 return nft_verdict_uninit(data);
8611         default:
8612                 WARN_ON(1);
8613         }
8614 }
8615 EXPORT_SYMBOL_GPL(nft_data_release);
8616
8617 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8618                   enum nft_data_types type, unsigned int len)
8619 {
8620         struct nlattr *nest;
8621         int err;
8622
8623         nest = nla_nest_start_noflag(skb, attr);
8624         if (nest == NULL)
8625                 return -1;
8626
8627         switch (type) {
8628         case NFT_DATA_VALUE:
8629                 err = nft_value_dump(skb, data, len);
8630                 break;
8631         case NFT_DATA_VERDICT:
8632                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8633                 break;
8634         default:
8635                 err = -EINVAL;
8636                 WARN_ON(1);
8637         }
8638
8639         nla_nest_end(skb, nest);
8640         return err;
8641 }
8642 EXPORT_SYMBOL_GPL(nft_data_dump);
8643
8644 int __nft_release_basechain(struct nft_ctx *ctx)
8645 {
8646         struct nft_rule *rule, *nr;
8647
8648         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8649                 return 0;
8650
8651         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8652         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8653                 list_del(&rule->list);
8654                 ctx->chain->use--;
8655                 nf_tables_rule_release(ctx, rule);
8656         }
8657         nft_chain_del(ctx->chain);
8658         ctx->table->use--;
8659         nf_tables_chain_destroy(ctx);
8660
8661         return 0;
8662 }
8663 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8664
8665 static void __nft_release_tables(struct net *net)
8666 {
8667         struct nft_flowtable *flowtable, *nf;
8668         struct nft_table *table, *nt;
8669         struct nft_chain *chain, *nc;
8670         struct nft_object *obj, *ne;
8671         struct nft_rule *rule, *nr;
8672         struct nft_set *set, *ns;
8673         struct nft_ctx ctx = {
8674                 .net    = net,
8675                 .family = NFPROTO_NETDEV,
8676         };
8677
8678         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8679                 ctx.family = table->family;
8680
8681                 list_for_each_entry(chain, &table->chains, list)
8682                         nf_tables_unregister_hook(net, table, chain);
8683                 /* No packets are walking on these chains anymore. */
8684                 ctx.table = table;
8685                 list_for_each_entry(chain, &table->chains, list) {
8686                         ctx.chain = chain;
8687                         list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8688                                 list_del(&rule->list);
8689                                 chain->use--;
8690                                 nf_tables_rule_release(&ctx, rule);
8691                         }
8692                 }
8693                 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8694                         list_del(&flowtable->list);
8695                         table->use--;
8696                         nf_tables_flowtable_destroy(flowtable);
8697                 }
8698                 list_for_each_entry_safe(set, ns, &table->sets, list) {
8699                         list_del(&set->list);
8700                         table->use--;
8701                         nft_set_destroy(&ctx, set);
8702                 }
8703                 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8704                         nft_obj_del(obj);
8705                         table->use--;
8706                         nft_obj_destroy(&ctx, obj);
8707                 }
8708                 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8709                         ctx.chain = chain;
8710                         nft_chain_del(chain);
8711                         table->use--;
8712                         nf_tables_chain_destroy(&ctx);
8713                 }
8714                 list_del(&table->list);
8715                 nf_tables_table_destroy(&ctx);
8716         }
8717 }
8718
8719 static int __net_init nf_tables_init_net(struct net *net)
8720 {
8721         INIT_LIST_HEAD(&net->nft.tables);
8722         INIT_LIST_HEAD(&net->nft.commit_list);
8723         INIT_LIST_HEAD(&net->nft.module_list);
8724         mutex_init(&net->nft.commit_mutex);
8725         net->nft.base_seq = 1;
8726         net->nft.validate_state = NFT_VALIDATE_SKIP;
8727
8728         return 0;
8729 }
8730
8731 static void __net_exit nf_tables_exit_net(struct net *net)
8732 {
8733         mutex_lock(&net->nft.commit_mutex);
8734         if (!list_empty(&net->nft.commit_list))
8735                 __nf_tables_abort(net, false);
8736         __nft_release_tables(net);
8737         mutex_unlock(&net->nft.commit_mutex);
8738         WARN_ON_ONCE(!list_empty(&net->nft.tables));
8739         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
8740 }
8741
8742 static struct pernet_operations nf_tables_net_ops = {
8743         .init   = nf_tables_init_net,
8744         .exit   = nf_tables_exit_net,
8745 };
8746
8747 static int __init nf_tables_module_init(void)
8748 {
8749         int err;
8750
8751         spin_lock_init(&nf_tables_destroy_list_lock);
8752         err = register_pernet_subsys(&nf_tables_net_ops);
8753         if (err < 0)
8754                 return err;
8755
8756         err = nft_chain_filter_init();
8757         if (err < 0)
8758                 goto err1;
8759
8760         err = nf_tables_core_module_init();
8761         if (err < 0)
8762                 goto err2;
8763
8764         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8765         if (err < 0)
8766                 goto err3;
8767
8768         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8769         if (err < 0)
8770                 goto err4;
8771
8772         err = nft_offload_init();
8773         if (err < 0)
8774                 goto err5;
8775
8776         /* must be last */
8777         err = nfnetlink_subsys_register(&nf_tables_subsys);
8778         if (err < 0)
8779                 goto err6;
8780
8781         nft_chain_route_init();
8782
8783         return err;
8784 err6:
8785         nft_offload_exit();
8786 err5:
8787         rhltable_destroy(&nft_objname_ht);
8788 err4:
8789         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8790 err3:
8791         nf_tables_core_module_exit();
8792 err2:
8793         nft_chain_filter_fini();
8794 err1:
8795         unregister_pernet_subsys(&nf_tables_net_ops);
8796         return err;
8797 }
8798
8799 static void __exit nf_tables_module_exit(void)
8800 {
8801         nfnetlink_subsys_unregister(&nf_tables_subsys);
8802         nft_offload_exit();
8803         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8804         nft_chain_filter_fini();
8805         nft_chain_route_fini();
8806         unregister_pernet_subsys(&nf_tables_net_ops);
8807         cancel_work_sync(&trans_destroy_work);
8808         rcu_barrier();
8809         rhltable_destroy(&nft_objname_ht);
8810         nf_tables_core_module_exit();
8811 }
8812
8813 module_init(nf_tables_module_init);
8814 module_exit(nf_tables_module_exit);
8815
8816 MODULE_LICENSE("GPL");
8817 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8818 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);