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 (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 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 (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 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 (nft_expr_more(rule, expr)) {
 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 (nft_expr_more(rule, expr)) {
 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 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 585                                              ...)
 586 {
 587         char module_name[MODULE_NAME_LEN];
 588         struct nft_module_request *req;
 589         va_list args;
 590         int ret;
 591
 592         va_start(args, fmt);
 593         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 594         va_end(args);
 595         if (ret >= MODULE_NAME_LEN)
 596                 return 0;
 597
 598         list_for_each_entry(req, &net->nft.module_list, list) {
 599                 if (!strcmp(req->module, module_name)) {
 600                         if (req->done)
 601                                 return 0;
 602
 603                         /* A request to load this module already exists. */
 604                         return -EAGAIN;
 605                 }
 606         }
 607
 608         req = kmalloc(sizeof(*req), GFP_KERNEL);
 609         if (!req)
 610                 return -ENOMEM;
 611
 612         req->done = false;
 613         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 614         list_add_tail(&req->list, &net->nft.module_list);
 615
 616         return -EAGAIN;
 617 }
 618 #endif
 619
 620 static void lockdep_nfnl_nft_mutex_not_held(void)
 621 {
 622 #ifdef CONFIG_PROVE_LOCKING
 623         if (debug_locks)
 624                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 625 #endif
 626 }
 627
 628 static const struct nft_chain_type *
 629 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 630                             u8 family, bool autoload)
 631 {
 632         const struct nft_chain_type *type;
 633
 634         type = __nf_tables_chain_type_lookup(nla, family);
 635         if (type != NULL)
 636                 return type;
 637
 638         lockdep_nfnl_nft_mutex_not_held();
 639 #ifdef CONFIG_MODULES
 640         if (autoload) {
 641                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 642                                        nla_len(nla),
 643                                        (const char *)nla_data(nla)) == -EAGAIN)
 644                         return ERR_PTR(-EAGAIN);
 645         }
 646 #endif
 647         return ERR_PTR(-ENOENT);
 648 }
 649
 650 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 651         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 652                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 653         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 654         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 655         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 656                                     .len = NFT_USERDATA_MAXLEN }
 657 };
 658
 659 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 660                                      u32 portid, u32 seq, int event, u32 flags,
 661                                      int family, const struct nft_table *table)
 662 {
 663         struct nlmsghdr *nlh;
 664         struct nfgenmsg *nfmsg;
 665
 666         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 667         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 668         if (nlh == NULL)
 669                 goto nla_put_failure;
 670
 671         nfmsg = nlmsg_data(nlh);
 672         nfmsg->nfgen_family     = family;
 673         nfmsg->version          = NFNETLINK_V0;
 674         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 675
 676         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 677             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 678             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 679             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 680                          NFTA_TABLE_PAD))
 681                 goto nla_put_failure;
 682
 683         if (table->udata) {
 684                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 685                         goto nla_put_failure;
 686         }
 687
 688         nlmsg_end(skb, nlh);
 689         return 0;
 690
 691 nla_put_failure:
 692         nlmsg_trim(skb, nlh);
 693         return -1;
 694 }
 695
 696 struct nftnl_skb_parms {
 697         bool report;
 698 };
 699 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 700
 701 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 702                                struct list_head *notify_list)
 703 {
 704         NFT_CB(skb).report = report;
 705         list_add_tail(&skb->list, notify_list);
 706 }
 707
 708 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 709 {
 710         struct sk_buff *skb;
 711         int err;
 712         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 713                               ctx->table->name, ctx->table->handle);
 714
 715         audit_log_nfcfg(buf,
 716                         ctx->family,
 717                         ctx->table->use,
 718                         event == NFT_MSG_NEWTABLE ?
 719                                 AUDIT_NFT_OP_TABLE_REGISTER :
 720                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 721                         GFP_KERNEL);
 722         kfree(buf);
 723
 724         if (!ctx->report &&
 725             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 726                 return;
 727
 728         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 729         if (skb == NULL)
 730                 goto err;
 731
 732         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 733                                         event, 0, ctx->family, ctx->table);
 734         if (err < 0) {
 735                 kfree_skb(skb);
 736                 goto err;
 737         }
 738
 739         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
 740         return;
 741 err:
 742         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 743 }
 744
 745 static int nf_tables_dump_tables(struct sk_buff *skb,
 746                                  struct netlink_callback *cb)
 747 {
 748         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 749         const struct nft_table *table;
 750         unsigned int idx = 0, s_idx = cb->args[0];
 751         struct net *net = sock_net(skb->sk);
 752         int family = nfmsg->nfgen_family;
 753
 754         rcu_read_lock();
 755         cb->seq = net->nft.base_seq;
 756
 757         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 758                 if (family != NFPROTO_UNSPEC && family != table->family)
 759                         continue;
 760
 761                 if (idx < s_idx)
 762                         goto cont;
 763                 if (idx > s_idx)
 764                         memset(&cb->args[1], 0,
 765                                sizeof(cb->args) - sizeof(cb->args[0]));
 766                 if (!nft_is_active(net, table))
 767                         continue;
 768                 if (nf_tables_fill_table_info(skb, net,
 769                                               NETLINK_CB(cb->skb).portid,
 770                                               cb->nlh->nlmsg_seq,
 771                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 772                                               table->family, table) < 0)
 773                         goto done;
 774
 775                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 776 cont:
 777                 idx++;
 778         }
 779 done:
 780         rcu_read_unlock();
 781         cb->args[0] = idx;
 782         return skb->len;
 783 }
 784
 785 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 786                                       const struct nlmsghdr *nlh,
 787                                       struct netlink_dump_control *c)
 788 {
 789         int err;
 790
 791         if (!try_module_get(THIS_MODULE))
 792                 return -EINVAL;
 793
 794         rcu_read_unlock();
 795         err = netlink_dump_start(nlsk, skb, nlh, c);
 796         rcu_read_lock();
 797         module_put(THIS_MODULE);
 798
 799         return err;
 800 }
 801
 802 /* called with rcu_read_lock held */
 803 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 804                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 805                               const struct nlattr * const nla[],
 806                               struct netlink_ext_ack *extack)
 807 {
 808         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 809         u8 genmask = nft_genmask_cur(net);
 810         const struct nft_table *table;
 811         struct sk_buff *skb2;
 812         int family = nfmsg->nfgen_family;
 813         int err;
 814
 815         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 816                 struct netlink_dump_control c = {
 817                         .dump = nf_tables_dump_tables,
 818                         .module = THIS_MODULE,
 819                 };
 820
 821                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 822         }
 823
 824         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
 825         if (IS_ERR(table)) {
 826                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 827                 return PTR_ERR(table);
 828         }
 829
 830         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 831         if (!skb2)
 832                 return -ENOMEM;
 833
 834         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 835                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 836                                         family, table);
 837         if (err < 0)
 838                 goto err_fill_table_info;
 839
 840         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 841
 842 err_fill_table_info:
 843         kfree_skb(skb2);
 844         return err;
 845 }
 846
 847 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 848 {
 849         struct nft_chain *chain;
 850         u32 i = 0;
 851
 852         list_for_each_entry(chain, &table->chains, list) {
 853                 if (!nft_is_active_next(net, chain))
 854                         continue;
 855                 if (!nft_is_base_chain(chain))
 856                         continue;
 857
 858                 if (cnt && i++ == cnt)
 859                         break;
 860
 861                 nf_tables_unregister_hook(net, table, chain);
 862         }
 863 }
 864
 865 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 866 {
 867         struct nft_chain *chain;
 868         int err, i = 0;
 869
 870         list_for_each_entry(chain, &table->chains, list) {
 871                 if (!nft_is_active_next(net, chain))
 872                         continue;
 873                 if (!nft_is_base_chain(chain))
 874                         continue;
 875
 876                 err = nf_tables_register_hook(net, table, chain);
 877                 if (err < 0)
 878                         goto err_register_hooks;
 879
 880                 i++;
 881         }
 882         return 0;
 883
 884 err_register_hooks:
 885         if (i)
 886                 nft_table_disable(net, table, i);
 887         return err;
 888 }
 889
 890 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 891 {
 892         nft_table_disable(net, table, 0);
 893 }
 894
 895 static int nf_tables_updtable(struct nft_ctx *ctx)
 896 {
 897         struct nft_trans *trans;
 898         u32 flags;
 899         int ret = 0;
 900
 901         if (!ctx->nla[NFTA_TABLE_FLAGS])
 902                 return 0;
 903
 904         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 905         if (flags & ~NFT_TABLE_F_DORMANT)
 906                 return -EINVAL;
 907
 908         if (flags == ctx->table->flags)
 909                 return 0;
 910
 911         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 912                                 sizeof(struct nft_trans_table));
 913         if (trans == NULL)
 914                 return -ENOMEM;
 915
 916         if ((flags & NFT_TABLE_F_DORMANT) &&
 917             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 918                 nft_trans_table_enable(trans) = false;
 919         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 920                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 921                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 922                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 923                 if (ret >= 0)
 924                         nft_trans_table_enable(trans) = true;
 925                 else
 926                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 927         }
 928         if (ret < 0)
 929                 goto err;
 930
 931         nft_trans_table_update(trans) = true;
 932         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 933         return 0;
 934 err:
 935         nft_trans_destroy(trans);
 936         return ret;
 937 }
 938
 939 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 940 {
 941         const char *name = data;
 942
 943         return jhash(name, strlen(name), seed);
 944 }
 945
 946 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 947 {
 948         const struct nft_chain *chain = data;
 949
 950         return nft_chain_hash(chain->name, 0, seed);
 951 }
 952
 953 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 954                               const void *ptr)
 955 {
 956         const struct nft_chain *chain = ptr;
 957         const char *name = arg->key;
 958
 959         return strcmp(chain->name, name);
 960 }
 961
 962 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 963 {
 964         const struct nft_object_hash_key *k = data;
 965
 966         seed ^= hash_ptr(k->table, 32);
 967
 968         return jhash(k->name, strlen(k->name), seed);
 969 }
 970
 971 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 972 {
 973         const struct nft_object *obj = data;
 974
 975         return nft_objname_hash(&obj->key, 0, seed);
 976 }
 977
 978 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 979                                 const void *ptr)
 980 {
 981         const struct nft_object_hash_key *k = arg->key;
 982         const struct nft_object *obj = ptr;
 983
 984         if (obj->key.table != k->table)
 985                 return -1;
 986
 987         return strcmp(obj->key.name, k->name);
 988 }
 989
 990 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
 991                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 992                               const struct nlattr * const nla[],
 993                               struct netlink_ext_ack *extack)
 994 {
 995         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 996         u8 genmask = nft_genmask_next(net);
 997         int family = nfmsg->nfgen_family;
 998         const struct nlattr *attr;
 999         struct nft_table *table;
1000         struct nft_ctx ctx;
1001         u32 flags = 0;
1002         int err;
1003
1004         lockdep_assert_held(&net->nft.commit_mutex);
1005         attr = nla[NFTA_TABLE_NAME];
1006         table = nft_table_lookup(net, attr, family, genmask);
1007         if (IS_ERR(table)) {
1008                 if (PTR_ERR(table) != -ENOENT)
1009                         return PTR_ERR(table);
1010         } else {
1011                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1012                         NL_SET_BAD_ATTR(extack, attr);
1013                         return -EEXIST;
1014                 }
1015                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1016                         return -EOPNOTSUPP;
1017
1018                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1019                 return nf_tables_updtable(&ctx);
1020         }
1021
1022         if (nla[NFTA_TABLE_FLAGS]) {
1023                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1024                 if (flags & ~NFT_TABLE_F_DORMANT)
1025                         return -EINVAL;
1026         }
1027
1028         err = -ENOMEM;
1029         table = kzalloc(sizeof(*table), GFP_KERNEL);
1030         if (table == NULL)
1031                 goto err_kzalloc;
1032
1033         table->name = nla_strdup(attr, GFP_KERNEL);
1034         if (table->name == NULL)
1035                 goto err_strdup;
1036
1037         if (nla[NFTA_TABLE_USERDATA]) {
1038                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1039                 if (table->udata == NULL)
1040                         goto err_table_udata;
1041
1042                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1043         }
1044
1045         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1046         if (err)
1047                 goto err_chain_ht;
1048
1049         INIT_LIST_HEAD(&table->chains);
1050         INIT_LIST_HEAD(&table->sets);
1051         INIT_LIST_HEAD(&table->objects);
1052         INIT_LIST_HEAD(&table->flowtables);
1053         table->family = family;
1054         table->flags = flags;
1055         table->handle = ++table_handle;
1056
1057         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1058         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1059         if (err < 0)
1060                 goto err_trans;
1061
1062         list_add_tail_rcu(&table->list, &net->nft.tables);
1063         return 0;
1064 err_trans:
1065         rhltable_destroy(&table->chains_ht);
1066 err_chain_ht:
1067         kfree(table->udata);
1068 err_table_udata:
1069         kfree(table->name);
1070 err_strdup:
1071         kfree(table);
1072 err_kzalloc:
1073         return err;
1074 }
1075
1076 static int nft_flush_table(struct nft_ctx *ctx)
1077 {
1078         struct nft_flowtable *flowtable, *nft;
1079         struct nft_chain *chain, *nc;
1080         struct nft_object *obj, *ne;
1081         struct nft_set *set, *ns;
1082         int err;
1083
1084         list_for_each_entry(chain, &ctx->table->chains, list) {
1085                 if (!nft_is_active_next(ctx->net, chain))
1086                         continue;
1087
1088                 if (nft_chain_is_bound(chain))
1089                         continue;
1090
1091                 ctx->chain = chain;
1092
1093                 err = nft_delrule_by_chain(ctx);
1094                 if (err < 0)
1095                         goto out;
1096         }
1097
1098         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1099                 if (!nft_is_active_next(ctx->net, set))
1100                         continue;
1101
1102                 if (nft_set_is_anonymous(set) &&
1103                     !list_empty(&set->bindings))
1104                         continue;
1105
1106                 err = nft_delset(ctx, set);
1107                 if (err < 0)
1108                         goto out;
1109         }
1110
1111         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1112                 if (!nft_is_active_next(ctx->net, flowtable))
1113                         continue;
1114
1115                 err = nft_delflowtable(ctx, flowtable);
1116                 if (err < 0)
1117                         goto out;
1118         }
1119
1120         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1121                 if (!nft_is_active_next(ctx->net, obj))
1122                         continue;
1123
1124                 err = nft_delobj(ctx, obj);
1125                 if (err < 0)
1126                         goto out;
1127         }
1128
1129         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1130                 if (!nft_is_active_next(ctx->net, chain))
1131                         continue;
1132
1133                 if (nft_chain_is_bound(chain))
1134                         continue;
1135
1136                 ctx->chain = chain;
1137
1138                 err = nft_delchain(ctx);
1139                 if (err < 0)
1140                         goto out;
1141         }
1142
1143         err = nft_deltable(ctx);
1144 out:
1145         return err;
1146 }
1147
1148 static int nft_flush(struct nft_ctx *ctx, int family)
1149 {
1150         struct nft_table *table, *nt;
1151         const struct nlattr * const *nla = ctx->nla;
1152         int err = 0;
1153
1154         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1155                 if (family != AF_UNSPEC && table->family != family)
1156                         continue;
1157
1158                 ctx->family = table->family;
1159
1160                 if (!nft_is_active_next(ctx->net, table))
1161                         continue;
1162
1163                 if (nla[NFTA_TABLE_NAME] &&
1164                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1165                         continue;
1166
1167                 ctx->table = table;
1168
1169                 err = nft_flush_table(ctx);
1170                 if (err < 0)
1171                         goto out;
1172         }
1173 out:
1174         return err;
1175 }
1176
1177 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1178                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1179                               const struct nlattr * const nla[],
1180                               struct netlink_ext_ack *extack)
1181 {
1182         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1183         u8 genmask = nft_genmask_next(net);
1184         int family = nfmsg->nfgen_family;
1185         const struct nlattr *attr;
1186         struct nft_table *table;
1187         struct nft_ctx ctx;
1188
1189         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1190         if (family == AF_UNSPEC ||
1191             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1192                 return nft_flush(&ctx, family);
1193
1194         if (nla[NFTA_TABLE_HANDLE]) {
1195                 attr = nla[NFTA_TABLE_HANDLE];
1196                 table = nft_table_lookup_byhandle(net, attr, genmask);
1197         } else {
1198                 attr = nla[NFTA_TABLE_NAME];
1199                 table = nft_table_lookup(net, attr, family, genmask);
1200         }
1201
1202         if (IS_ERR(table)) {
1203                 NL_SET_BAD_ATTR(extack, attr);
1204                 return PTR_ERR(table);
1205         }
1206
1207         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1208             table->use > 0)
1209                 return -EBUSY;
1210
1211         ctx.family = family;
1212         ctx.table = table;
1213
1214         return nft_flush_table(&ctx);
1215 }
1216
1217 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1218 {
1219         if (WARN_ON(ctx->table->use > 0))
1220                 return;
1221
1222         rhltable_destroy(&ctx->table->chains_ht);
1223         kfree(ctx->table->name);
1224         kfree(ctx->table->udata);
1225         kfree(ctx->table);
1226 }
1227
1228 void nft_register_chain_type(const struct nft_chain_type *ctype)
1229 {
1230         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1231         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1232                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1233                 return;
1234         }
1235         chain_type[ctype->family][ctype->type] = ctype;
1236         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1237 }
1238 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1239
1240 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1241 {
1242         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1243         chain_type[ctype->family][ctype->type] = NULL;
1244         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1245 }
1246 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1247
1248 /*
1249  * Chains
1250  */
1251
1252 static struct nft_chain *
1253 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1254 {
1255         struct nft_chain *chain;
1256
1257         list_for_each_entry(chain, &table->chains, list) {
1258                 if (chain->handle == handle &&
1259                     nft_active_genmask(chain, genmask))
1260                         return chain;
1261         }
1262
1263         return ERR_PTR(-ENOENT);
1264 }
1265
1266 static bool lockdep_commit_lock_is_held(const struct net *net)
1267 {
1268 #ifdef CONFIG_PROVE_LOCKING
1269         return lockdep_is_held(&net->nft.commit_mutex);
1270 #else
1271         return true;
1272 #endif
1273 }
1274
1275 static struct nft_chain *nft_chain_lookup(struct net *net,
1276                                           struct nft_table *table,
1277                                           const struct nlattr *nla, u8 genmask)
1278 {
1279         char search[NFT_CHAIN_MAXNAMELEN + 1];
1280         struct rhlist_head *tmp, *list;
1281         struct nft_chain *chain;
1282
1283         if (nla == NULL)
1284                 return ERR_PTR(-EINVAL);
1285
1286         nla_strscpy(search, nla, sizeof(search));
1287
1288         WARN_ON(!rcu_read_lock_held() &&
1289                 !lockdep_commit_lock_is_held(net));
1290
1291         chain = ERR_PTR(-ENOENT);
1292         rcu_read_lock();
1293         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1294         if (!list)
1295                 goto out_unlock;
1296
1297         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1298                 if (nft_active_genmask(chain, genmask))
1299                         goto out_unlock;
1300         }
1301         chain = ERR_PTR(-ENOENT);
1302 out_unlock:
1303         rcu_read_unlock();
1304         return chain;
1305 }
1306
1307 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1308         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1309                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1310         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1311         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1312                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1313         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1314         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1315         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1316                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1317         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1318         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1319         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1320         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1321                                     .len = NFT_USERDATA_MAXLEN },
1322 };
1323
1324 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1325         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1326         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1327         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1328                                     .len = IFNAMSIZ - 1 },
1329 };
1330
1331 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1332 {
1333         struct nft_stats *cpu_stats, total;
1334         struct nlattr *nest;
1335         unsigned int seq;
1336         u64 pkts, bytes;
1337         int cpu;
1338
1339         if (!stats)
1340                 return 0;
1341
1342         memset(&total, 0, sizeof(total));
1343         for_each_possible_cpu(cpu) {
1344                 cpu_stats = per_cpu_ptr(stats, cpu);
1345                 do {
1346                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1347                         pkts = cpu_stats->pkts;
1348                         bytes = cpu_stats->bytes;
1349                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1350                 total.pkts += pkts;
1351                 total.bytes += bytes;
1352         }
1353         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1354         if (nest == NULL)
1355                 goto nla_put_failure;
1356
1357         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1358                          NFTA_COUNTER_PAD) ||
1359             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1360                          NFTA_COUNTER_PAD))
1361                 goto nla_put_failure;
1362
1363         nla_nest_end(skb, nest);
1364         return 0;
1365
1366 nla_put_failure:
1367         return -ENOSPC;
1368 }
1369
1370 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1371                                    const struct nft_base_chain *basechain)
1372 {
1373         const struct nf_hook_ops *ops = &basechain->ops;
1374         struct nft_hook *hook, *first = NULL;
1375         struct nlattr *nest, *nest_devs;
1376         int n = 0;
1377
1378         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1379         if (nest == NULL)
1380                 goto nla_put_failure;
1381         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1382                 goto nla_put_failure;
1383         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1384                 goto nla_put_failure;
1385
1386         if (nft_base_chain_netdev(family, ops->hooknum)) {
1387                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1388                 list_for_each_entry(hook, &basechain->hook_list, list) {
1389                         if (!first)
1390                                 first = hook;
1391
1392                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1393                                            hook->ops.dev->name))
1394                                 goto nla_put_failure;
1395                         n++;
1396                 }
1397                 nla_nest_end(skb, nest_devs);
1398
1399                 if (n == 1 &&
1400                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1401                         goto nla_put_failure;
1402         }
1403         nla_nest_end(skb, nest);
1404
1405         return 0;
1406 nla_put_failure:
1407         return -1;
1408 }
1409
1410 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1411                                      u32 portid, u32 seq, int event, u32 flags,
1412                                      int family, const struct nft_table *table,
1413                                      const struct nft_chain *chain)
1414 {
1415         struct nlmsghdr *nlh;
1416         struct nfgenmsg *nfmsg;
1417
1418         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1419         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1420         if (nlh == NULL)
1421                 goto nla_put_failure;
1422
1423         nfmsg = nlmsg_data(nlh);
1424         nfmsg->nfgen_family     = family;
1425         nfmsg->version          = NFNETLINK_V0;
1426         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1427
1428         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1429                 goto nla_put_failure;
1430         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1431                          NFTA_CHAIN_PAD))
1432                 goto nla_put_failure;
1433         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1434                 goto nla_put_failure;
1435
1436         if (nft_is_base_chain(chain)) {
1437                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1438                 struct nft_stats __percpu *stats;
1439
1440                 if (nft_dump_basechain_hook(skb, family, basechain))
1441                         goto nla_put_failure;
1442
1443                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1444                                  htonl(basechain->policy)))
1445                         goto nla_put_failure;
1446
1447                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1448                         goto nla_put_failure;
1449
1450                 stats = rcu_dereference_check(basechain->stats,
1451                                               lockdep_commit_lock_is_held(net));
1452                 if (nft_dump_stats(skb, stats))
1453                         goto nla_put_failure;
1454         }
1455
1456         if (chain->flags &&
1457             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1458                 goto nla_put_failure;
1459
1460         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1461                 goto nla_put_failure;
1462
1463         if (chain->udata &&
1464             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1465                 goto nla_put_failure;
1466
1467         nlmsg_end(skb, nlh);
1468         return 0;
1469
1470 nla_put_failure:
1471         nlmsg_trim(skb, nlh);
1472         return -1;
1473 }
1474
1475 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1476 {
1477         struct sk_buff *skb;
1478         int err;
1479         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1480                               ctx->table->name, ctx->table->handle,
1481                               ctx->chain->name, ctx->chain->handle);
1482
1483         audit_log_nfcfg(buf,
1484                         ctx->family,
1485                         ctx->chain->use,
1486                         event == NFT_MSG_NEWCHAIN ?
1487                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1488                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1489                         GFP_KERNEL);
1490         kfree(buf);
1491
1492         if (!ctx->report &&
1493             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1494                 return;
1495
1496         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1497         if (skb == NULL)
1498                 goto err;
1499
1500         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1501                                         event, 0, ctx->family, ctx->table,
1502                                         ctx->chain);
1503         if (err < 0) {
1504                 kfree_skb(skb);
1505                 goto err;
1506         }
1507
1508         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1509         return;
1510 err:
1511         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1512 }
1513
1514 static int nf_tables_dump_chains(struct sk_buff *skb,
1515                                  struct netlink_callback *cb)
1516 {
1517         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1518         const struct nft_table *table;
1519         const struct nft_chain *chain;
1520         unsigned int idx = 0, s_idx = cb->args[0];
1521         struct net *net = sock_net(skb->sk);
1522         int family = nfmsg->nfgen_family;
1523
1524         rcu_read_lock();
1525         cb->seq = net->nft.base_seq;
1526
1527         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1528                 if (family != NFPROTO_UNSPEC && family != table->family)
1529                         continue;
1530
1531                 list_for_each_entry_rcu(chain, &table->chains, list) {
1532                         if (idx < s_idx)
1533                                 goto cont;
1534                         if (idx > s_idx)
1535                                 memset(&cb->args[1], 0,
1536                                        sizeof(cb->args) - sizeof(cb->args[0]));
1537                         if (!nft_is_active(net, chain))
1538                                 continue;
1539                         if (nf_tables_fill_chain_info(skb, net,
1540                                                       NETLINK_CB(cb->skb).portid,
1541                                                       cb->nlh->nlmsg_seq,
1542                                                       NFT_MSG_NEWCHAIN,
1543                                                       NLM_F_MULTI,
1544                                                       table->family, table,
1545                                                       chain) < 0)
1546                                 goto done;
1547
1548                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1549 cont:
1550                         idx++;
1551                 }
1552         }
1553 done:
1554         rcu_read_unlock();
1555         cb->args[0] = idx;
1556         return skb->len;
1557 }
1558
1559 /* called with rcu_read_lock held */
1560 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1561                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1562                               const struct nlattr * const nla[],
1563                               struct netlink_ext_ack *extack)
1564 {
1565         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1566         u8 genmask = nft_genmask_cur(net);
1567         const struct nft_chain *chain;
1568         struct nft_table *table;
1569         struct sk_buff *skb2;
1570         int family = nfmsg->nfgen_family;
1571         int err;
1572
1573         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1574                 struct netlink_dump_control c = {
1575                         .dump = nf_tables_dump_chains,
1576                         .module = THIS_MODULE,
1577                 };
1578
1579                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1580         }
1581
1582         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1583         if (IS_ERR(table)) {
1584                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1585                 return PTR_ERR(table);
1586         }
1587
1588         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1589         if (IS_ERR(chain)) {
1590                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1591                 return PTR_ERR(chain);
1592         }
1593
1594         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1595         if (!skb2)
1596                 return -ENOMEM;
1597
1598         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1599                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1600                                         family, table, chain);
1601         if (err < 0)
1602                 goto err_fill_chain_info;
1603
1604         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1605
1606 err_fill_chain_info:
1607         kfree_skb(skb2);
1608         return err;
1609 }
1610
1611 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1612         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1613         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1614 };
1615
1616 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1617 {
1618         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1619         struct nft_stats __percpu *newstats;
1620         struct nft_stats *stats;
1621         int err;
1622
1623         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1624                                           nft_counter_policy, NULL);
1625         if (err < 0)
1626                 return ERR_PTR(err);
1627
1628         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1629                 return ERR_PTR(-EINVAL);
1630
1631         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1632         if (newstats == NULL)
1633                 return ERR_PTR(-ENOMEM);
1634
1635         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1636          * are not exposed to userspace.
1637          */
1638         preempt_disable();
1639         stats = this_cpu_ptr(newstats);
1640         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1641         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1642         preempt_enable();
1643
1644         return newstats;
1645 }
1646
1647 static void nft_chain_stats_replace(struct nft_trans *trans)
1648 {
1649         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1650
1651         if (!nft_trans_chain_stats(trans))
1652                 return;
1653
1654         nft_trans_chain_stats(trans) =
1655                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1656                                     lockdep_commit_lock_is_held(trans->ctx.net));
1657
1658         if (!nft_trans_chain_stats(trans))
1659                 static_branch_inc(&nft_counters_enabled);
1660 }
1661
1662 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1663 {
1664         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1665         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1666
1667         if (g0 != g1)
1668                 kvfree(g1);
1669         kvfree(g0);
1670
1671         /* should be NULL either via abort or via successful commit */
1672         WARN_ON_ONCE(chain->rules_next);
1673         kvfree(chain->rules_next);
1674 }
1675
1676 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1677 {
1678         struct nft_chain *chain = ctx->chain;
1679         struct nft_hook *hook, *next;
1680
1681         if (WARN_ON(chain->use > 0))
1682                 return;
1683
1684         /* no concurrent access possible anymore */
1685         nf_tables_chain_free_chain_rules(chain);
1686
1687         if (nft_is_base_chain(chain)) {
1688                 struct nft_base_chain *basechain = nft_base_chain(chain);
1689
1690                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1691                         list_for_each_entry_safe(hook, next,
1692                                                  &basechain->hook_list, list) {
1693                                 list_del_rcu(&hook->list);
1694                                 kfree_rcu(hook, rcu);
1695                         }
1696                 }
1697                 module_put(basechain->type->owner);
1698                 if (rcu_access_pointer(basechain->stats)) {
1699                         static_branch_dec(&nft_counters_enabled);
1700                         free_percpu(rcu_dereference_raw(basechain->stats));
1701                 }
1702                 kfree(chain->name);
1703                 kfree(chain->udata);
1704                 kfree(basechain);
1705         } else {
1706                 kfree(chain->name);
1707                 kfree(chain->udata);
1708                 kfree(chain);
1709         }
1710 }
1711
1712 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1713                                               const struct nlattr *attr)
1714 {
1715         struct net_device *dev;
1716         char ifname[IFNAMSIZ];
1717         struct nft_hook *hook;
1718         int err;
1719
1720         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1721         if (!hook) {
1722                 err = -ENOMEM;
1723                 goto err_hook_alloc;
1724         }
1725
1726         nla_strscpy(ifname, attr, IFNAMSIZ);
1727         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1728          * indirectly serializing all the other holders of the commit_mutex with
1729          * the rtnl_mutex.
1730          */
1731         dev = __dev_get_by_name(net, ifname);
1732         if (!dev) {
1733                 err = -ENOENT;
1734                 goto err_hook_dev;
1735         }
1736         hook->ops.dev = dev;
1737         hook->inactive = false;
1738
1739         return hook;
1740
1741 err_hook_dev:
1742         kfree(hook);
1743 err_hook_alloc:
1744         return ERR_PTR(err);
1745 }
1746
1747 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1748                                            const struct nft_hook *this)
1749 {
1750         struct nft_hook *hook;
1751
1752         list_for_each_entry(hook, hook_list, list) {
1753                 if (this->ops.dev == hook->ops.dev)
1754                         return hook;
1755         }
1756
1757         return NULL;
1758 }
1759
1760 static int nf_tables_parse_netdev_hooks(struct net *net,
1761                                         const struct nlattr *attr,
1762                                         struct list_head *hook_list)
1763 {
1764         struct nft_hook *hook, *next;
1765         const struct nlattr *tmp;
1766         int rem, n = 0, err;
1767
1768         nla_for_each_nested(tmp, attr, rem) {
1769                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1770                         err = -EINVAL;
1771                         goto err_hook;
1772                 }
1773
1774                 hook = nft_netdev_hook_alloc(net, tmp);
1775                 if (IS_ERR(hook)) {
1776                         err = PTR_ERR(hook);
1777                         goto err_hook;
1778                 }
1779                 if (nft_hook_list_find(hook_list, hook)) {
1780                         kfree(hook);
1781                         err = -EEXIST;
1782                         goto err_hook;
1783                 }
1784                 list_add_tail(&hook->list, hook_list);
1785                 n++;
1786
1787                 if (n == NFT_NETDEVICE_MAX) {
1788                         err = -EFBIG;
1789                         goto err_hook;
1790                 }
1791         }
1792
1793         return 0;
1794
1795 err_hook:
1796         list_for_each_entry_safe(hook, next, hook_list, list) {
1797                 list_del(&hook->list);
1798                 kfree(hook);
1799         }
1800         return err;
1801 }
1802
1803 struct nft_chain_hook {
1804         u32                             num;
1805         s32                             priority;
1806         const struct nft_chain_type     *type;
1807         struct list_head                list;
1808 };
1809
1810 static int nft_chain_parse_netdev(struct net *net,
1811                                   struct nlattr *tb[],
1812                                   struct list_head *hook_list)
1813 {
1814         struct nft_hook *hook;
1815         int err;
1816
1817         if (tb[NFTA_HOOK_DEV]) {
1818                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1819                 if (IS_ERR(hook))
1820                         return PTR_ERR(hook);
1821
1822                 list_add_tail(&hook->list, hook_list);
1823         } else if (tb[NFTA_HOOK_DEVS]) {
1824                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1825                                                    hook_list);
1826                 if (err < 0)
1827                         return err;
1828
1829                 if (list_empty(hook_list))
1830                         return -EINVAL;
1831         } else {
1832                 return -EINVAL;
1833         }
1834
1835         return 0;
1836 }
1837
1838 static int nft_chain_parse_hook(struct net *net,
1839                                 const struct nlattr * const nla[],
1840                                 struct nft_chain_hook *hook, u8 family,
1841                                 bool autoload)
1842 {
1843         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1844         const struct nft_chain_type *type;
1845         int err;
1846
1847         lockdep_assert_held(&net->nft.commit_mutex);
1848         lockdep_nfnl_nft_mutex_not_held();
1849
1850         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1851                                           nla[NFTA_CHAIN_HOOK],
1852                                           nft_hook_policy, NULL);
1853         if (err < 0)
1854                 return err;
1855
1856         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1857             ha[NFTA_HOOK_PRIORITY] == NULL)
1858                 return -EINVAL;
1859
1860         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1861         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1862
1863         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1864         if (!type)
1865                 return -EOPNOTSUPP;
1866
1867         if (nla[NFTA_CHAIN_TYPE]) {
1868                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1869                                                    family, autoload);
1870                 if (IS_ERR(type))
1871                         return PTR_ERR(type);
1872         }
1873         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1874                 return -EOPNOTSUPP;
1875
1876         if (type->type == NFT_CHAIN_T_NAT &&
1877             hook->priority <= NF_IP_PRI_CONNTRACK)
1878                 return -EOPNOTSUPP;
1879
1880         if (!try_module_get(type->owner))
1881                 return -ENOENT;
1882
1883         hook->type = type;
1884
1885         INIT_LIST_HEAD(&hook->list);
1886         if (nft_base_chain_netdev(family, hook->num)) {
1887                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1888                 if (err < 0) {
1889                         module_put(type->owner);
1890                         return err;
1891                 }
1892         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1893                 module_put(type->owner);
1894                 return -EOPNOTSUPP;
1895         }
1896
1897         return 0;
1898 }
1899
1900 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1901 {
1902         struct nft_hook *h, *next;
1903
1904         list_for_each_entry_safe(h, next, &hook->list, list) {
1905                 list_del(&h->list);
1906                 kfree(h);
1907         }
1908         module_put(hook->type->owner);
1909 }
1910
1911 struct nft_rules_old {
1912         struct rcu_head h;
1913         struct nft_rule **start;
1914 };
1915
1916 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1917                                                      unsigned int alloc)
1918 {
1919         if (alloc > INT_MAX)
1920                 return NULL;
1921
1922         alloc += 1;     /* NULL, ends rules */
1923         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1924                 return NULL;
1925
1926         alloc *= sizeof(struct nft_rule *);
1927         alloc += sizeof(struct nft_rules_old);
1928
1929         return kvmalloc(alloc, GFP_KERNEL);
1930 }
1931
1932 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1933                                     const struct nft_chain_hook *hook,
1934                                     struct nft_chain *chain)
1935 {
1936         ops->pf         = family;
1937         ops->hooknum    = hook->num;
1938         ops->priority   = hook->priority;
1939         ops->priv       = chain;
1940         ops->hook       = hook->type->hooks[ops->hooknum];
1941 }
1942
1943 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1944                               struct nft_chain_hook *hook, u32 flags)
1945 {
1946         struct nft_chain *chain;
1947         struct nft_hook *h;
1948
1949         basechain->type = hook->type;
1950         INIT_LIST_HEAD(&basechain->hook_list);
1951         chain = &basechain->chain;
1952
1953         if (nft_base_chain_netdev(family, hook->num)) {
1954                 list_splice_init(&hook->list, &basechain->hook_list);
1955                 list_for_each_entry(h, &basechain->hook_list, list)
1956                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1957
1958                 basechain->ops.hooknum  = hook->num;
1959                 basechain->ops.priority = hook->priority;
1960         } else {
1961                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1962         }
1963
1964         chain->flags |= NFT_CHAIN_BASE | flags;
1965         basechain->policy = NF_ACCEPT;
1966         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1967             nft_chain_offload_priority(basechain) < 0)
1968                 return -EOPNOTSUPP;
1969
1970         flow_block_init(&basechain->flow_block);
1971
1972         return 0;
1973 }
1974
1975 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1976 {
1977         int err;
1978
1979         err = rhltable_insert_key(&table->chains_ht, chain->name,
1980                                   &chain->rhlhead, nft_chain_ht_params);
1981         if (err)
1982                 return err;
1983
1984         list_add_tail_rcu(&chain->list, &table->chains);
1985
1986         return 0;
1987 }
1988
1989 static u64 chain_id;
1990
1991 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1992                               u8 policy, u32 flags)
1993 {
1994         const struct nlattr * const *nla = ctx->nla;
1995         struct nft_table *table = ctx->table;
1996         struct nft_base_chain *basechain;
1997         struct nft_stats __percpu *stats;
1998         struct net *net = ctx->net;
1999         char name[NFT_NAME_MAXLEN];
2000         struct nft_trans *trans;
2001         struct nft_chain *chain;
2002         struct nft_rule **rules;
2003         int err;
2004
2005         if (table->use == UINT_MAX)
2006                 return -EOVERFLOW;
2007
2008         if (nla[NFTA_CHAIN_HOOK]) {
2009                 struct nft_chain_hook hook;
2010
2011                 if (flags & NFT_CHAIN_BINDING)
2012                         return -EOPNOTSUPP;
2013
2014                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2015                 if (err < 0)
2016                         return err;
2017
2018                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2019                 if (basechain == NULL) {
2020                         nft_chain_release_hook(&hook);
2021                         return -ENOMEM;
2022                 }
2023                 chain = &basechain->chain;
2024
2025                 if (nla[NFTA_CHAIN_COUNTERS]) {
2026                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2027                         if (IS_ERR(stats)) {
2028                                 nft_chain_release_hook(&hook);
2029                                 kfree(basechain);
2030                                 return PTR_ERR(stats);
2031                         }
2032                         rcu_assign_pointer(basechain->stats, stats);
2033                         static_branch_inc(&nft_counters_enabled);
2034                 }
2035
2036                 err = nft_basechain_init(basechain, family, &hook, flags);
2037                 if (err < 0) {
2038                         nft_chain_release_hook(&hook);
2039                         kfree(basechain);
2040                         return err;
2041                 }
2042         } else {
2043                 if (flags & NFT_CHAIN_BASE)
2044                         return -EINVAL;
2045                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2046                         return -EOPNOTSUPP;
2047
2048                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2049                 if (chain == NULL)
2050                         return -ENOMEM;
2051
2052                 chain->flags = flags;
2053         }
2054         ctx->chain = chain;
2055
2056         INIT_LIST_HEAD(&chain->rules);
2057         chain->handle = nf_tables_alloc_handle(table);
2058         chain->table = table;
2059
2060         if (nla[NFTA_CHAIN_NAME]) {
2061                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2062         } else {
2063                 if (!(flags & NFT_CHAIN_BINDING)) {
2064                         err = -EINVAL;
2065                         goto err_destroy_chain;
2066                 }
2067
2068                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2069                 chain->name = kstrdup(name, GFP_KERNEL);
2070         }
2071
2072         if (!chain->name) {
2073                 err = -ENOMEM;
2074                 goto err_destroy_chain;
2075         }
2076
2077         if (nla[NFTA_CHAIN_USERDATA]) {
2078                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2079                 if (chain->udata == NULL) {
2080                         err = -ENOMEM;
2081                         goto err_destroy_chain;
2082                 }
2083                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2084         }
2085
2086         rules = nf_tables_chain_alloc_rules(chain, 0);
2087         if (!rules) {
2088                 err = -ENOMEM;
2089                 goto err_destroy_chain;
2090         }
2091
2092         *rules = NULL;
2093         rcu_assign_pointer(chain->rules_gen_0, rules);
2094         rcu_assign_pointer(chain->rules_gen_1, rules);
2095
2096         err = nf_tables_register_hook(net, table, chain);
2097         if (err < 0)
2098                 goto err_destroy_chain;
2099
2100         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2101         if (IS_ERR(trans)) {
2102                 err = PTR_ERR(trans);
2103                 goto err_unregister_hook;
2104         }
2105
2106         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2107         if (nft_is_base_chain(chain))
2108                 nft_trans_chain_policy(trans) = policy;
2109
2110         err = nft_chain_add(table, chain);
2111         if (err < 0) {
2112                 nft_trans_destroy(trans);
2113                 goto err_unregister_hook;
2114         }
2115
2116         table->use++;
2117
2118         return 0;
2119 err_unregister_hook:
2120         nf_tables_unregister_hook(net, table, chain);
2121 err_destroy_chain:
2122         nf_tables_chain_destroy(ctx);
2123
2124         return err;
2125 }
2126
2127 static bool nft_hook_list_equal(struct list_head *hook_list1,
2128                                 struct list_head *hook_list2)
2129 {
2130         struct nft_hook *hook;
2131         int n = 0, m = 0;
2132
2133         n = 0;
2134         list_for_each_entry(hook, hook_list2, list) {
2135                 if (!nft_hook_list_find(hook_list1, hook))
2136                         return false;
2137
2138                 n++;
2139         }
2140         list_for_each_entry(hook, hook_list1, list)
2141                 m++;
2142
2143         return n == m;
2144 }
2145
2146 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2147                               u32 flags, const struct nlattr *attr,
2148                               struct netlink_ext_ack *extack)
2149 {
2150         const struct nlattr * const *nla = ctx->nla;
2151         struct nft_table *table = ctx->table;
2152         struct nft_chain *chain = ctx->chain;
2153         struct nft_base_chain *basechain;
2154         struct nft_stats *stats = NULL;
2155         struct nft_chain_hook hook;
2156         struct nf_hook_ops *ops;
2157         struct nft_trans *trans;
2158         int err;
2159
2160         if (chain->flags ^ flags)
2161                 return -EOPNOTSUPP;
2162
2163         if (nla[NFTA_CHAIN_HOOK]) {
2164                 if (!nft_is_base_chain(chain)) {
2165                         NL_SET_BAD_ATTR(extack, attr);
2166                         return -EEXIST;
2167                 }
2168                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2169                                            false);
2170                 if (err < 0)
2171                         return err;
2172
2173                 basechain = nft_base_chain(chain);
2174                 if (basechain->type != hook.type) {
2175                         nft_chain_release_hook(&hook);
2176                         NL_SET_BAD_ATTR(extack, attr);
2177                         return -EEXIST;
2178                 }
2179
2180                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2181                         if (!nft_hook_list_equal(&basechain->hook_list,
2182                                                  &hook.list)) {
2183                                 nft_chain_release_hook(&hook);
2184                                 NL_SET_BAD_ATTR(extack, attr);
2185                                 return -EEXIST;
2186                         }
2187                 } else {
2188                         ops = &basechain->ops;
2189                         if (ops->hooknum != hook.num ||
2190                             ops->priority != hook.priority) {
2191                                 nft_chain_release_hook(&hook);
2192                                 NL_SET_BAD_ATTR(extack, attr);
2193                                 return -EEXIST;
2194                         }
2195                 }
2196                 nft_chain_release_hook(&hook);
2197         }
2198
2199         if (nla[NFTA_CHAIN_HANDLE] &&
2200             nla[NFTA_CHAIN_NAME]) {
2201                 struct nft_chain *chain2;
2202
2203                 chain2 = nft_chain_lookup(ctx->net, table,
2204                                           nla[NFTA_CHAIN_NAME], genmask);
2205                 if (!IS_ERR(chain2)) {
2206                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2207                         return -EEXIST;
2208                 }
2209         }
2210
2211         if (nla[NFTA_CHAIN_COUNTERS]) {
2212                 if (!nft_is_base_chain(chain))
2213                         return -EOPNOTSUPP;
2214
2215                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2216                 if (IS_ERR(stats))
2217                         return PTR_ERR(stats);
2218         }
2219
2220         err = -ENOMEM;
2221         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2222                                 sizeof(struct nft_trans_chain));
2223         if (trans == NULL)
2224                 goto err;
2225
2226         nft_trans_chain_stats(trans) = stats;
2227         nft_trans_chain_update(trans) = true;
2228
2229         if (nla[NFTA_CHAIN_POLICY])
2230                 nft_trans_chain_policy(trans) = policy;
2231         else
2232                 nft_trans_chain_policy(trans) = -1;
2233
2234         if (nla[NFTA_CHAIN_HANDLE] &&
2235             nla[NFTA_CHAIN_NAME]) {
2236                 struct nft_trans *tmp;
2237                 char *name;
2238
2239                 err = -ENOMEM;
2240                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2241                 if (!name)
2242                         goto err;
2243
2244                 err = -EEXIST;
2245                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2246                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2247                             tmp->ctx.table == table &&
2248                             nft_trans_chain_update(tmp) &&
2249                             nft_trans_chain_name(tmp) &&
2250                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2251                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2252                                 kfree(name);
2253                                 goto err;
2254                         }
2255                 }
2256
2257                 nft_trans_chain_name(trans) = name;
2258         }
2259         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2260
2261         return 0;
2262 err:
2263         free_percpu(stats);
2264         kfree(trans);
2265         return err;
2266 }
2267
2268 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2269                                                const struct nlattr *nla)
2270 {
2271         u32 id = ntohl(nla_get_be32(nla));
2272         struct nft_trans *trans;
2273
2274         list_for_each_entry(trans, &net->nft.commit_list, list) {
2275                 struct nft_chain *chain = trans->ctx.chain;
2276
2277                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2278                     id == nft_trans_chain_id(trans))
2279                         return chain;
2280         }
2281         return ERR_PTR(-ENOENT);
2282 }
2283
2284 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2285                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2286                               const struct nlattr * const nla[],
2287                               struct netlink_ext_ack *extack)
2288 {
2289         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2290         u8 genmask = nft_genmask_next(net);
2291         int family = nfmsg->nfgen_family;
2292         struct nft_chain *chain = NULL;
2293         const struct nlattr *attr;
2294         struct nft_table *table;
2295         u8 policy = NF_ACCEPT;
2296         struct nft_ctx ctx;
2297         u64 handle = 0;
2298         u32 flags = 0;
2299
2300         lockdep_assert_held(&net->nft.commit_mutex);
2301
2302         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2303         if (IS_ERR(table)) {
2304                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2305                 return PTR_ERR(table);
2306         }
2307
2308         chain = NULL;
2309         attr = nla[NFTA_CHAIN_NAME];
2310
2311         if (nla[NFTA_CHAIN_HANDLE]) {
2312                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2313                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2314                 if (IS_ERR(chain)) {
2315                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2316                         return PTR_ERR(chain);
2317                 }
2318                 attr = nla[NFTA_CHAIN_HANDLE];
2319         } else if (nla[NFTA_CHAIN_NAME]) {
2320                 chain = nft_chain_lookup(net, table, attr, genmask);
2321                 if (IS_ERR(chain)) {
2322                         if (PTR_ERR(chain) != -ENOENT) {
2323                                 NL_SET_BAD_ATTR(extack, attr);
2324                                 return PTR_ERR(chain);
2325                         }
2326                         chain = NULL;
2327                 }
2328         } else if (!nla[NFTA_CHAIN_ID]) {
2329                 return -EINVAL;
2330         }
2331
2332         if (nla[NFTA_CHAIN_POLICY]) {
2333                 if (chain != NULL &&
2334                     !nft_is_base_chain(chain)) {
2335                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2336                         return -EOPNOTSUPP;
2337                 }
2338
2339                 if (chain == NULL &&
2340                     nla[NFTA_CHAIN_HOOK] == NULL) {
2341                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2342                         return -EOPNOTSUPP;
2343                 }
2344
2345                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2346                 switch (policy) {
2347                 case NF_DROP:
2348                 case NF_ACCEPT:
2349                         break;
2350                 default:
2351                         return -EINVAL;
2352                 }
2353         }
2354
2355         if (nla[NFTA_CHAIN_FLAGS])
2356                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2357         else if (chain)
2358                 flags = chain->flags;
2359
2360         if (flags & ~NFT_CHAIN_FLAGS)
2361                 return -EOPNOTSUPP;
2362
2363         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2364
2365         if (chain != NULL) {
2366                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2367                         NL_SET_BAD_ATTR(extack, attr);
2368                         return -EEXIST;
2369                 }
2370                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2371                         return -EOPNOTSUPP;
2372
2373                 flags |= chain->flags & NFT_CHAIN_BASE;
2374                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2375                                           extack);
2376         }
2377
2378         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2379 }
2380
2381 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2382                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2383                               const struct nlattr * const nla[],
2384                               struct netlink_ext_ack *extack)
2385 {
2386         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2387         u8 genmask = nft_genmask_next(net);
2388         int family = nfmsg->nfgen_family;
2389         const struct nlattr *attr;
2390         struct nft_table *table;
2391         struct nft_chain *chain;
2392         struct nft_rule *rule;
2393         struct nft_ctx ctx;
2394         u64 handle;
2395         u32 use;
2396         int err;
2397
2398         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2399         if (IS_ERR(table)) {
2400                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2401                 return PTR_ERR(table);
2402         }
2403
2404         if (nla[NFTA_CHAIN_HANDLE]) {
2405                 attr = nla[NFTA_CHAIN_HANDLE];
2406                 handle = be64_to_cpu(nla_get_be64(attr));
2407                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2408         } else {
2409                 attr = nla[NFTA_CHAIN_NAME];
2410                 chain = nft_chain_lookup(net, table, attr, genmask);
2411         }
2412         if (IS_ERR(chain)) {
2413                 NL_SET_BAD_ATTR(extack, attr);
2414                 return PTR_ERR(chain);
2415         }
2416
2417         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2418             chain->use > 0)
2419                 return -EBUSY;
2420
2421         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2422
2423         use = chain->use;
2424         list_for_each_entry(rule, &chain->rules, list) {
2425                 if (!nft_is_active_next(net, rule))
2426                         continue;
2427                 use--;
2428
2429                 err = nft_delrule(&ctx, rule);
2430                 if (err < 0)
2431                         return err;
2432         }
2433
2434         /* There are rules and elements that are still holding references to us,
2435          * we cannot do a recursive removal in this case.
2436          */
2437         if (use > 0) {
2438                 NL_SET_BAD_ATTR(extack, attr);
2439                 return -EBUSY;
2440         }
2441
2442         return nft_delchain(&ctx);
2443 }
2444
2445 /*
2446  * Expressions
2447  */
2448
2449 /**
2450  *      nft_register_expr - register nf_tables expr type
2451  *      @type: expr type
2452  *
2453  *      Registers the expr type for use with nf_tables. Returns zero on
2454  *      success or a negative errno code otherwise.
2455  */
2456 int nft_register_expr(struct nft_expr_type *type)
2457 {
2458         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2459         if (type->family == NFPROTO_UNSPEC)
2460                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2461         else
2462                 list_add_rcu(&type->list, &nf_tables_expressions);
2463         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2464         return 0;
2465 }
2466 EXPORT_SYMBOL_GPL(nft_register_expr);
2467
2468 /**
2469  *      nft_unregister_expr - unregister nf_tables expr type
2470  *      @type: expr type
2471  *
2472  *      Unregisters the expr typefor use with nf_tables.
2473  */
2474 void nft_unregister_expr(struct nft_expr_type *type)
2475 {
2476         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2477         list_del_rcu(&type->list);
2478         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2479 }
2480 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2481
2482 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2483                                                        struct nlattr *nla)
2484 {
2485         const struct nft_expr_type *type, *candidate = NULL;
2486
2487         list_for_each_entry(type, &nf_tables_expressions, list) {
2488                 if (!nla_strcmp(nla, type->name)) {
2489                         if (!type->family && !candidate)
2490                                 candidate = type;
2491                         else if (type->family == family)
2492                                 candidate = type;
2493                 }
2494         }
2495         return candidate;
2496 }
2497
2498 #ifdef CONFIG_MODULES
2499 static int nft_expr_type_request_module(struct net *net, u8 family,
2500                                         struct nlattr *nla)
2501 {
2502         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2503                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2504                 return -EAGAIN;
2505
2506         return 0;
2507 }
2508 #endif
2509
2510 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2511                                                      u8 family,
2512                                                      struct nlattr *nla)
2513 {
2514         const struct nft_expr_type *type;
2515
2516         if (nla == NULL)
2517                 return ERR_PTR(-EINVAL);
2518
2519         type = __nft_expr_type_get(family, nla);
2520         if (type != NULL && try_module_get(type->owner))
2521                 return type;
2522
2523         lockdep_nfnl_nft_mutex_not_held();
2524 #ifdef CONFIG_MODULES
2525         if (type == NULL) {
2526                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2527                         return ERR_PTR(-EAGAIN);
2528
2529                 if (nft_request_module(net, "nft-expr-%.*s",
2530                                        nla_len(nla),
2531                                        (char *)nla_data(nla)) == -EAGAIN)
2532                         return ERR_PTR(-EAGAIN);
2533         }
2534 #endif
2535         return ERR_PTR(-ENOENT);
2536 }
2537
2538 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2539         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2540                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2541         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2542 };
2543
2544 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2545                                     const struct nft_expr *expr)
2546 {
2547         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2548                 goto nla_put_failure;
2549
2550         if (expr->ops->dump) {
2551                 struct nlattr *data = nla_nest_start_noflag(skb,
2552                                                             NFTA_EXPR_DATA);
2553                 if (data == NULL)
2554                         goto nla_put_failure;
2555                 if (expr->ops->dump(skb, expr) < 0)
2556                         goto nla_put_failure;
2557                 nla_nest_end(skb, data);
2558         }
2559
2560         return skb->len;
2561
2562 nla_put_failure:
2563         return -1;
2564 };
2565
2566 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2567                   const struct nft_expr *expr)
2568 {
2569         struct nlattr *nest;
2570
2571         nest = nla_nest_start_noflag(skb, attr);
2572         if (!nest)
2573                 goto nla_put_failure;
2574         if (nf_tables_fill_expr_info(skb, expr) < 0)
2575                 goto nla_put_failure;
2576         nla_nest_end(skb, nest);
2577         return 0;
2578
2579 nla_put_failure:
2580         return -1;
2581 }
2582
2583 struct nft_expr_info {
2584         const struct nft_expr_ops       *ops;
2585         const struct nlattr             *attr;
2586         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2587 };
2588
2589 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2590                                 const struct nlattr *nla,
2591                                 struct nft_expr_info *info)
2592 {
2593         const struct nft_expr_type *type;
2594         const struct nft_expr_ops *ops;
2595         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2596         int err;
2597
2598         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2599                                           nft_expr_policy, NULL);
2600         if (err < 0)
2601                 return err;
2602
2603         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2604         if (IS_ERR(type))
2605                 return PTR_ERR(type);
2606
2607         if (tb[NFTA_EXPR_DATA]) {
2608                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2609                                                   tb[NFTA_EXPR_DATA],
2610                                                   type->policy, NULL);
2611                 if (err < 0)
2612                         goto err1;
2613         } else
2614                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2615
2616         if (type->select_ops != NULL) {
2617                 ops = type->select_ops(ctx,
2618                                        (const struct nlattr * const *)info->tb);
2619                 if (IS_ERR(ops)) {
2620                         err = PTR_ERR(ops);
2621 #ifdef CONFIG_MODULES
2622                         if (err == -EAGAIN)
2623                                 if (nft_expr_type_request_module(ctx->net,
2624                                                                  ctx->family,
2625                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2626                                         err = -ENOENT;
2627 #endif
2628                         goto err1;
2629                 }
2630         } else
2631                 ops = type->ops;
2632
2633         info->attr = nla;
2634         info->ops = ops;
2635
2636         return 0;
2637
2638 err1:
2639         module_put(type->owner);
2640         return err;
2641 }
2642
2643 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2644                              const struct nft_expr_info *info,
2645                              struct nft_expr *expr)
2646 {
2647         const struct nft_expr_ops *ops = info->ops;
2648         int err;
2649
2650         expr->ops = ops;
2651         if (ops->init) {
2652                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2653                 if (err < 0)
2654                         goto err1;
2655         }
2656
2657         return 0;
2658 err1:
2659         expr->ops = NULL;
2660         return err;
2661 }
2662
2663 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2664                                    struct nft_expr *expr)
2665 {
2666         const struct nft_expr_type *type = expr->ops->type;
2667
2668         if (expr->ops->destroy)
2669                 expr->ops->destroy(ctx, expr);
2670         module_put(type->owner);
2671 }
2672
2673 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2674                                       const struct nlattr *nla)
2675 {
2676         struct nft_expr_info info;
2677         struct nft_expr *expr;
2678         struct module *owner;
2679         int err;
2680
2681         err = nf_tables_expr_parse(ctx, nla, &info);
2682         if (err < 0)
2683                 goto err1;
2684
2685         err = -ENOMEM;
2686         expr = kzalloc(info.ops->size, GFP_KERNEL);
2687         if (expr == NULL)
2688                 goto err2;
2689
2690         err = nf_tables_newexpr(ctx, &info, expr);
2691         if (err < 0)
2692                 goto err3;
2693
2694         return expr;
2695 err3:
2696         kfree(expr);
2697 err2:
2698         owner = info.ops->type->owner;
2699         if (info.ops->type->release_ops)
2700                 info.ops->type->release_ops(info.ops);
2701
2702         module_put(owner);
2703 err1:
2704         return ERR_PTR(err);
2705 }
2706
2707 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2708 {
2709         int err;
2710
2711         if (src->ops->clone) {
2712                 dst->ops = src->ops;
2713                 err = src->ops->clone(dst, src);
2714                 if (err < 0)
2715                         return err;
2716         } else {
2717                 memcpy(dst, src, src->ops->size);
2718         }
2719
2720         __module_get(src->ops->type->owner);
2721
2722         return 0;
2723 }
2724
2725 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2726 {
2727         nf_tables_expr_destroy(ctx, expr);
2728         kfree(expr);
2729 }
2730
2731 /*
2732  * Rules
2733  */
2734
2735 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2736                                           u64 handle)
2737 {
2738         struct nft_rule *rule;
2739
2740         // FIXME: this sucks
2741         list_for_each_entry_rcu(rule, &chain->rules, list) {
2742                 if (handle == rule->handle)
2743                         return rule;
2744         }
2745
2746         return ERR_PTR(-ENOENT);
2747 }
2748
2749 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2750                                         const struct nlattr *nla)
2751 {
2752         if (nla == NULL)
2753                 return ERR_PTR(-EINVAL);
2754
2755         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2756 }
2757
2758 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2759         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2760                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2761         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2762                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2763         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2764         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2765         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2766         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2767         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2768                                     .len = NFT_USERDATA_MAXLEN },
2769         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2770         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2771         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2772 };
2773
2774 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2775                                     u32 portid, u32 seq, int event,
2776                                     u32 flags, int family,
2777                                     const struct nft_table *table,
2778                                     const struct nft_chain *chain,
2779                                     const struct nft_rule *rule,
2780                                     const struct nft_rule *prule)
2781 {
2782         struct nlmsghdr *nlh;
2783         struct nfgenmsg *nfmsg;
2784         const struct nft_expr *expr, *next;
2785         struct nlattr *list;
2786         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2787
2788         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2789         if (nlh == NULL)
2790                 goto nla_put_failure;
2791
2792         nfmsg = nlmsg_data(nlh);
2793         nfmsg->nfgen_family     = family;
2794         nfmsg->version          = NFNETLINK_V0;
2795         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2796
2797         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2798                 goto nla_put_failure;
2799         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2800                 goto nla_put_failure;
2801         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2802                          NFTA_RULE_PAD))
2803                 goto nla_put_failure;
2804
2805         if (event != NFT_MSG_DELRULE && prule) {
2806                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2807                                  cpu_to_be64(prule->handle),
2808                                  NFTA_RULE_PAD))
2809                         goto nla_put_failure;
2810         }
2811
2812         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2813         if (list == NULL)
2814                 goto nla_put_failure;
2815         nft_rule_for_each_expr(expr, next, rule) {
2816                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2817                         goto nla_put_failure;
2818         }
2819         nla_nest_end(skb, list);
2820
2821         if (rule->udata) {
2822                 struct nft_userdata *udata = nft_userdata(rule);
2823                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2824                             udata->data) < 0)
2825                         goto nla_put_failure;
2826         }
2827
2828         nlmsg_end(skb, nlh);
2829         return 0;
2830
2831 nla_put_failure:
2832         nlmsg_trim(skb, nlh);
2833         return -1;
2834 }
2835
2836 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2837                                   const struct nft_rule *rule, int event)
2838 {
2839         struct sk_buff *skb;
2840         int err;
2841         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2842                               ctx->table->name, ctx->table->handle,
2843                               ctx->chain->name, ctx->chain->handle);
2844
2845         audit_log_nfcfg(buf,
2846                         ctx->family,
2847                         rule->handle,
2848                         event == NFT_MSG_NEWRULE ?
2849                                 AUDIT_NFT_OP_RULE_REGISTER :
2850                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2851                         GFP_KERNEL);
2852         kfree(buf);
2853
2854         if (!ctx->report &&
2855             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2856                 return;
2857
2858         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2859         if (skb == NULL)
2860                 goto err;
2861
2862         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2863                                        event, 0, ctx->family, ctx->table,
2864                                        ctx->chain, rule, NULL);
2865         if (err < 0) {
2866                 kfree_skb(skb);
2867                 goto err;
2868         }
2869
2870         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2871         return;
2872 err:
2873         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2874 }
2875
2876 struct nft_rule_dump_ctx {
2877         char *table;
2878         char *chain;
2879 };
2880
2881 static int __nf_tables_dump_rules(struct sk_buff *skb,
2882                                   unsigned int *idx,
2883                                   struct netlink_callback *cb,
2884                                   const struct nft_table *table,
2885                                   const struct nft_chain *chain)
2886 {
2887         struct net *net = sock_net(skb->sk);
2888         const struct nft_rule *rule, *prule;
2889         unsigned int s_idx = cb->args[0];
2890
2891         prule = NULL;
2892         list_for_each_entry_rcu(rule, &chain->rules, list) {
2893                 if (!nft_is_active(net, rule))
2894                         goto cont_skip;
2895                 if (*idx < s_idx)
2896                         goto cont;
2897                 if (*idx > s_idx) {
2898                         memset(&cb->args[1], 0,
2899                                         sizeof(cb->args) - sizeof(cb->args[0]));
2900                 }
2901                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2902                                         cb->nlh->nlmsg_seq,
2903                                         NFT_MSG_NEWRULE,
2904                                         NLM_F_MULTI | NLM_F_APPEND,
2905                                         table->family,
2906                                         table, chain, rule, prule) < 0)
2907                         return 1;
2908
2909                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2910 cont:
2911                 prule = rule;
2912 cont_skip:
2913                 (*idx)++;
2914         }
2915         return 0;
2916 }
2917
2918 static int nf_tables_dump_rules(struct sk_buff *skb,
2919                                 struct netlink_callback *cb)
2920 {
2921         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2922         const struct nft_rule_dump_ctx *ctx = cb->data;
2923         struct nft_table *table;
2924         const struct nft_chain *chain;
2925         unsigned int idx = 0;
2926         struct net *net = sock_net(skb->sk);
2927         int family = nfmsg->nfgen_family;
2928
2929         rcu_read_lock();
2930         cb->seq = net->nft.base_seq;
2931
2932         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2933                 if (family != NFPROTO_UNSPEC && family != table->family)
2934                         continue;
2935
2936                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2937                         continue;
2938
2939                 if (ctx && ctx->table && ctx->chain) {
2940                         struct rhlist_head *list, *tmp;
2941
2942                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2943                                                nft_chain_ht_params);
2944                         if (!list)
2945                                 goto done;
2946
2947                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2948                                 if (!nft_is_active(net, chain))
2949                                         continue;
2950                                 __nf_tables_dump_rules(skb, &idx,
2951                                                        cb, table, chain);
2952                                 break;
2953                         }
2954                         goto done;
2955                 }
2956
2957                 list_for_each_entry_rcu(chain, &table->chains, list) {
2958                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2959                                 goto done;
2960                 }
2961
2962                 if (ctx && ctx->table)
2963                         break;
2964         }
2965 done:
2966         rcu_read_unlock();
2967
2968         cb->args[0] = idx;
2969         return skb->len;
2970 }
2971
2972 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2973 {
2974         const struct nlattr * const *nla = cb->data;
2975         struct nft_rule_dump_ctx *ctx = NULL;
2976
2977         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2978                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2979                 if (!ctx)
2980                         return -ENOMEM;
2981
2982                 if (nla[NFTA_RULE_TABLE]) {
2983                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2984                                                         GFP_ATOMIC);
2985                         if (!ctx->table) {
2986                                 kfree(ctx);
2987                                 return -ENOMEM;
2988                         }
2989                 }
2990                 if (nla[NFTA_RULE_CHAIN]) {
2991                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2992                                                 GFP_ATOMIC);
2993                         if (!ctx->chain) {
2994                                 kfree(ctx->table);
2995                                 kfree(ctx);
2996                                 return -ENOMEM;
2997                         }
2998                 }
2999         }
3000
3001         cb->data = ctx;
3002         return 0;
3003 }
3004
3005 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3006 {
3007         struct nft_rule_dump_ctx *ctx = cb->data;
3008
3009         if (ctx) {
3010                 kfree(ctx->table);
3011                 kfree(ctx->chain);
3012                 kfree(ctx);
3013         }
3014         return 0;
3015 }
3016
3017 /* called with rcu_read_lock held */
3018 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3019                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3020                              const struct nlattr * const nla[],
3021                              struct netlink_ext_ack *extack)
3022 {
3023         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3024         u8 genmask = nft_genmask_cur(net);
3025         const struct nft_chain *chain;
3026         const struct nft_rule *rule;
3027         struct nft_table *table;
3028         struct sk_buff *skb2;
3029         int family = nfmsg->nfgen_family;
3030         int err;
3031
3032         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3033                 struct netlink_dump_control c = {
3034                         .start= nf_tables_dump_rules_start,
3035                         .dump = nf_tables_dump_rules,
3036                         .done = nf_tables_dump_rules_done,
3037                         .module = THIS_MODULE,
3038                         .data = (void *)nla,
3039                 };
3040
3041                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3042         }
3043
3044         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3045         if (IS_ERR(table)) {
3046                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3047                 return PTR_ERR(table);
3048         }
3049
3050         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3051         if (IS_ERR(chain)) {
3052                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3053                 return PTR_ERR(chain);
3054         }
3055
3056         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3057         if (IS_ERR(rule)) {
3058                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3059                 return PTR_ERR(rule);
3060         }
3061
3062         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3063         if (!skb2)
3064                 return -ENOMEM;
3065
3066         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3067                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3068                                        family, table, chain, rule, NULL);
3069         if (err < 0)
3070                 goto err_fill_rule_info;
3071
3072         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3073
3074 err_fill_rule_info:
3075         kfree_skb(skb2);
3076         return err;
3077 }
3078
3079 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3080                                    struct nft_rule *rule)
3081 {
3082         struct nft_expr *expr, *next;
3083
3084         /*
3085          * Careful: some expressions might not be initialized in case this
3086          * is called on error from nf_tables_newrule().
3087          */
3088         expr = nft_expr_first(rule);
3089         while (nft_expr_more(rule, expr)) {
3090                 next = nft_expr_next(expr);
3091                 nf_tables_expr_destroy(ctx, expr);
3092                 expr = next;
3093         }
3094         kfree(rule);
3095 }
3096
3097 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3098 {
3099         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3100         nf_tables_rule_destroy(ctx, rule);
3101 }
3102
3103 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3104 {
3105         struct nft_expr *expr, *last;
3106         const struct nft_data *data;
3107         struct nft_rule *rule;
3108         int err;
3109
3110         if (ctx->level == NFT_JUMP_STACK_SIZE)
3111                 return -EMLINK;
3112
3113         list_for_each_entry(rule, &chain->rules, list) {
3114                 if (!nft_is_active_next(ctx->net, rule))
3115                         continue;
3116
3117                 nft_rule_for_each_expr(expr, last, rule) {
3118                         if (!expr->ops->validate)
3119                                 continue;
3120
3121                         err = expr->ops->validate(ctx, expr, &data);
3122                         if (err < 0)
3123                                 return err;
3124                 }
3125         }
3126
3127         return 0;
3128 }
3129 EXPORT_SYMBOL_GPL(nft_chain_validate);
3130
3131 static int nft_table_validate(struct net *net, const struct nft_table *table)
3132 {
3133         struct nft_chain *chain;
3134         struct nft_ctx ctx = {
3135                 .net    = net,
3136                 .family = table->family,
3137         };
3138         int err;
3139
3140         list_for_each_entry(chain, &table->chains, list) {
3141                 if (!nft_is_base_chain(chain))
3142                         continue;
3143
3144                 ctx.chain = chain;
3145                 err = nft_chain_validate(&ctx, chain);
3146                 if (err < 0)
3147                         return err;
3148         }
3149
3150         return 0;
3151 }
3152
3153 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3154                                              const struct nlattr *nla);
3155
3156 #define NFT_RULE_MAXEXPRS       128
3157
3158 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3159                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3160                              const struct nlattr * const nla[],
3161                              struct netlink_ext_ack *extack)
3162 {
3163         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3164         u8 genmask = nft_genmask_next(net);
3165         struct nft_expr_info *info = NULL;
3166         int family = nfmsg->nfgen_family;
3167         struct nft_flow_rule *flow;
3168         struct nft_table *table;
3169         struct nft_chain *chain;
3170         struct nft_rule *rule, *old_rule = NULL;
3171         struct nft_userdata *udata;
3172         struct nft_trans *trans = NULL;
3173         struct nft_expr *expr;
3174         struct nft_ctx ctx;
3175         struct nlattr *tmp;
3176         unsigned int size, i, n, ulen = 0, usize = 0;
3177         int err, rem;
3178         u64 handle, pos_handle;
3179
3180         lockdep_assert_held(&net->nft.commit_mutex);
3181
3182         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3183         if (IS_ERR(table)) {
3184                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3185                 return PTR_ERR(table);
3186         }
3187
3188         if (nla[NFTA_RULE_CHAIN]) {
3189                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3190                                          genmask);
3191                 if (IS_ERR(chain)) {
3192                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3193                         return PTR_ERR(chain);
3194                 }
3195                 if (nft_chain_is_bound(chain))
3196                         return -EOPNOTSUPP;
3197
3198         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3199                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3200                 if (IS_ERR(chain)) {
3201                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3202                         return PTR_ERR(chain);
3203                 }
3204         } else {
3205                 return -EINVAL;
3206         }
3207
3208         if (nla[NFTA_RULE_HANDLE]) {
3209                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3210                 rule = __nft_rule_lookup(chain, handle);
3211                 if (IS_ERR(rule)) {
3212                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3213                         return PTR_ERR(rule);
3214                 }
3215
3216                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3217                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3218                         return -EEXIST;
3219                 }
3220                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3221                         old_rule = rule;
3222                 else
3223                         return -EOPNOTSUPP;
3224         } else {
3225                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3226                     nlh->nlmsg_flags & NLM_F_REPLACE)
3227                         return -EINVAL;
3228                 handle = nf_tables_alloc_handle(table);
3229
3230                 if (chain->use == UINT_MAX)
3231                         return -EOVERFLOW;
3232
3233                 if (nla[NFTA_RULE_POSITION]) {
3234                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3235                         old_rule = __nft_rule_lookup(chain, pos_handle);
3236                         if (IS_ERR(old_rule)) {
3237                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3238                                 return PTR_ERR(old_rule);
3239                         }
3240                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3241                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3242                         if (IS_ERR(old_rule)) {
3243                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3244                                 return PTR_ERR(old_rule);
3245                         }
3246                 }
3247         }
3248
3249         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3250
3251         n = 0;
3252         size = 0;
3253         if (nla[NFTA_RULE_EXPRESSIONS]) {
3254                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3255                                       sizeof(struct nft_expr_info),
3256                                       GFP_KERNEL);
3257                 if (!info)
3258                         return -ENOMEM;
3259
3260                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3261                         err = -EINVAL;
3262                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3263                                 goto err1;
3264                         if (n == NFT_RULE_MAXEXPRS)
3265                                 goto err1;
3266                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3267                         if (err < 0)
3268                                 goto err1;
3269                         size += info[n].ops->size;
3270                         n++;
3271                 }
3272         }
3273         /* Check for overflow of dlen field */
3274         err = -EFBIG;
3275         if (size >= 1 << 12)
3276                 goto err1;
3277
3278         if (nla[NFTA_RULE_USERDATA]) {
3279                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3280                 if (ulen > 0)
3281                         usize = sizeof(struct nft_userdata) + ulen;
3282         }
3283
3284         err = -ENOMEM;
3285         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3286         if (rule == NULL)
3287                 goto err1;
3288
3289         nft_activate_next(net, rule);
3290
3291         rule->handle = handle;
3292         rule->dlen   = size;
3293         rule->udata  = ulen ? 1 : 0;
3294
3295         if (ulen) {
3296                 udata = nft_userdata(rule);
3297                 udata->len = ulen - 1;
3298                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3299         }
3300
3301         expr = nft_expr_first(rule);
3302         for (i = 0; i < n; i++) {
3303                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3304                 if (err < 0) {
3305                         NL_SET_BAD_ATTR(extack, info[i].attr);
3306                         goto err2;
3307                 }
3308
3309                 if (info[i].ops->validate)
3310                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3311
3312                 info[i].ops = NULL;
3313                 expr = nft_expr_next(expr);
3314         }
3315
3316         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3317                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3318                 if (trans == NULL) {
3319                         err = -ENOMEM;
3320                         goto err2;
3321                 }
3322                 err = nft_delrule(&ctx, old_rule);
3323                 if (err < 0) {
3324                         nft_trans_destroy(trans);
3325                         goto err2;
3326                 }
3327
3328                 list_add_tail_rcu(&rule->list, &old_rule->list);
3329         } else {
3330                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3331                 if (!trans) {
3332                         err = -ENOMEM;
3333                         goto err2;
3334                 }
3335
3336                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3337                         if (old_rule)
3338                                 list_add_rcu(&rule->list, &old_rule->list);
3339                         else
3340                                 list_add_tail_rcu(&rule->list, &chain->rules);
3341                  } else {
3342                         if (old_rule)
3343                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3344                         else
3345                                 list_add_rcu(&rule->list, &chain->rules);
3346                 }
3347         }
3348         kvfree(info);
3349         chain->use++;
3350
3351         if (net->nft.validate_state == NFT_VALIDATE_DO)
3352                 return nft_table_validate(net, table);
3353
3354         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3355                 flow = nft_flow_rule_create(net, rule);
3356                 if (IS_ERR(flow))
3357                         return PTR_ERR(flow);
3358
3359                 nft_trans_flow_rule(trans) = flow;
3360         }
3361
3362         return 0;
3363 err2:
3364         nf_tables_rule_release(&ctx, rule);
3365 err1:
3366         for (i = 0; i < n; i++) {
3367                 if (info[i].ops) {
3368                         module_put(info[i].ops->type->owner);
3369                         if (info[i].ops->type->release_ops)
3370                                 info[i].ops->type->release_ops(info[i].ops);
3371                 }
3372         }
3373         kvfree(info);
3374         return err;
3375 }
3376
3377 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3378                                              const struct nlattr *nla)
3379 {
3380         u32 id = ntohl(nla_get_be32(nla));
3381         struct nft_trans *trans;
3382
3383         list_for_each_entry(trans, &net->nft.commit_list, list) {
3384                 struct nft_rule *rule = nft_trans_rule(trans);
3385
3386                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3387                     id == nft_trans_rule_id(trans))
3388                         return rule;
3389         }
3390         return ERR_PTR(-ENOENT);
3391 }
3392
3393 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3394                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3395                              const struct nlattr * const nla[],
3396                              struct netlink_ext_ack *extack)
3397 {
3398         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3399         u8 genmask = nft_genmask_next(net);
3400         struct nft_table *table;
3401         struct nft_chain *chain = NULL;
3402         struct nft_rule *rule;
3403         int family = nfmsg->nfgen_family, err = 0;
3404         struct nft_ctx ctx;
3405
3406         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3407         if (IS_ERR(table)) {
3408                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3409                 return PTR_ERR(table);
3410         }
3411
3412         if (nla[NFTA_RULE_CHAIN]) {
3413                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3414                                          genmask);
3415                 if (IS_ERR(chain)) {
3416                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3417                         return PTR_ERR(chain);
3418                 }
3419                 if (nft_chain_is_bound(chain))
3420                         return -EOPNOTSUPP;
3421         }
3422
3423         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3424
3425         if (chain) {
3426                 if (nla[NFTA_RULE_HANDLE]) {
3427                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3428                         if (IS_ERR(rule)) {
3429                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3430                                 return PTR_ERR(rule);
3431                         }
3432
3433                         err = nft_delrule(&ctx, rule);
3434                 } else if (nla[NFTA_RULE_ID]) {
3435                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3436                         if (IS_ERR(rule)) {
3437                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3438                                 return PTR_ERR(rule);
3439                         }
3440
3441                         err = nft_delrule(&ctx, rule);
3442                 } else {
3443                         err = nft_delrule_by_chain(&ctx);
3444                 }
3445         } else {
3446                 list_for_each_entry(chain, &table->chains, list) {
3447                         if (!nft_is_active_next(net, chain))
3448                                 continue;
3449
3450                         ctx.chain = chain;
3451                         err = nft_delrule_by_chain(&ctx);
3452                         if (err < 0)
3453                                 break;
3454                 }
3455         }
3456
3457         return err;
3458 }
3459
3460 /*
3461  * Sets
3462  */
3463 static const struct nft_set_type *nft_set_types[] = {
3464         &nft_set_hash_fast_type,
3465         &nft_set_hash_type,
3466         &nft_set_rhash_type,
3467         &nft_set_bitmap_type,
3468         &nft_set_rbtree_type,
3469 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3470         &nft_set_pipapo_avx2_type,
3471 #endif
3472         &nft_set_pipapo_type,
3473 };
3474
3475 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3476                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3477                                  NFT_SET_EVAL)
3478
3479 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3480 {
3481         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3482 }
3483
3484 /*
3485  * Select a set implementation based on the data characteristics and the
3486  * given policy. The total memory use might not be known if no size is
3487  * given, in that case the amount of memory per element is used.
3488  */
3489 static const struct nft_set_ops *
3490 nft_select_set_ops(const struct nft_ctx *ctx,
3491                    const struct nlattr * const nla[],
3492                    const struct nft_set_desc *desc,
3493                    enum nft_set_policies policy)
3494 {
3495         const struct nft_set_ops *ops, *bops;
3496         struct nft_set_estimate est, best;
3497         const struct nft_set_type *type;
3498         u32 flags = 0;
3499         int i;
3500
3501         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3502         lockdep_nfnl_nft_mutex_not_held();
3503
3504         if (nla[NFTA_SET_FLAGS] != NULL)
3505                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3506
3507         bops        = NULL;
3508         best.size   = ~0;
3509         best.lookup = ~0;
3510         best.space  = ~0;
3511
3512         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3513                 type = nft_set_types[i];
3514                 ops = &type->ops;
3515
3516                 if (!nft_set_ops_candidate(type, flags))
3517                         continue;
3518                 if (!ops->estimate(desc, flags, &est))
3519                         continue;
3520
3521                 switch (policy) {
3522                 case NFT_SET_POL_PERFORMANCE:
3523                         if (est.lookup < best.lookup)
3524                                 break;
3525                         if (est.lookup == best.lookup &&
3526                             est.space < best.space)
3527                                 break;
3528                         continue;
3529                 case NFT_SET_POL_MEMORY:
3530                         if (!desc->size) {
3531                                 if (est.space < best.space)
3532                                         break;
3533                                 if (est.space == best.space &&
3534                                     est.lookup < best.lookup)
3535                                         break;
3536                         } else if (est.size < best.size || !bops) {
3537                                 break;
3538                         }
3539                         continue;
3540                 default:
3541                         break;
3542                 }
3543
3544                 bops = ops;
3545                 best = est;
3546         }
3547
3548         if (bops != NULL)
3549                 return bops;
3550
3551         return ERR_PTR(-EOPNOTSUPP);
3552 }
3553
3554 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3555         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3556                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3557         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3558                                             .len = NFT_SET_MAXNAMELEN - 1 },
3559         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3560         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3561         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3562         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3563         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3564         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3565         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3566         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3567         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3568         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3569         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3570                                             .len  = NFT_USERDATA_MAXLEN },
3571         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3572         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3573         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3574 };
3575
3576 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3577         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3578         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3579 };
3580
3581 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3582                                      const struct sk_buff *skb,
3583                                      const struct nlmsghdr *nlh,
3584                                      const struct nlattr * const nla[],
3585                                      struct netlink_ext_ack *extack,
3586                                      u8 genmask)
3587 {
3588         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3589         int family = nfmsg->nfgen_family;
3590         struct nft_table *table = NULL;
3591
3592         if (nla[NFTA_SET_TABLE] != NULL) {
3593                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3594                                          genmask);
3595                 if (IS_ERR(table)) {
3596                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3597                         return PTR_ERR(table);
3598                 }
3599         }
3600
3601         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3602         return 0;
3603 }
3604
3605 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3606                                       const struct nlattr *nla, u8 genmask)
3607 {
3608         struct nft_set *set;
3609
3610         if (nla == NULL)
3611                 return ERR_PTR(-EINVAL);
3612
3613         list_for_each_entry_rcu(set, &table->sets, list) {
3614                 if (!nla_strcmp(nla, set->name) &&
3615                     nft_active_genmask(set, genmask))
3616                         return set;
3617         }
3618         return ERR_PTR(-ENOENT);
3619 }
3620
3621 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3622                                                const struct nlattr *nla,
3623                                                u8 genmask)
3624 {
3625         struct nft_set *set;
3626
3627         list_for_each_entry(set, &table->sets, list) {
3628                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3629                     nft_active_genmask(set, genmask))
3630                         return set;
3631         }
3632         return ERR_PTR(-ENOENT);
3633 }
3634
3635 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3636                                            const struct nlattr *nla, u8 genmask)
3637 {
3638         struct nft_trans *trans;
3639         u32 id = ntohl(nla_get_be32(nla));
3640
3641         list_for_each_entry(trans, &net->nft.commit_list, list) {
3642                 if (trans->msg_type == NFT_MSG_NEWSET) {
3643                         struct nft_set *set = nft_trans_set(trans);
3644
3645                         if (id == nft_trans_set_id(trans) &&
3646                             nft_active_genmask(set, genmask))
3647                                 return set;
3648                 }
3649         }
3650         return ERR_PTR(-ENOENT);
3651 }
3652
3653 struct nft_set *nft_set_lookup_global(const struct net *net,
3654                                       const struct nft_table *table,
3655                                       const struct nlattr *nla_set_name,
3656                                       const struct nlattr *nla_set_id,
3657                                       u8 genmask)
3658 {
3659         struct nft_set *set;
3660
3661         set = nft_set_lookup(table, nla_set_name, genmask);
3662         if (IS_ERR(set)) {
3663                 if (!nla_set_id)
3664                         return set;
3665
3666                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3667         }
3668         return set;
3669 }
3670 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3671
3672 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3673                                     const char *name)
3674 {
3675         const struct nft_set *i;
3676         const char *p;
3677         unsigned long *inuse;
3678         unsigned int n = 0, min = 0;
3679
3680         p = strchr(name, '%');
3681         if (p != NULL) {
3682                 if (p[1] != 'd' || strchr(p + 2, '%'))
3683                         return -EINVAL;
3684
3685                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3686                 if (inuse == NULL)
3687                         return -ENOMEM;
3688 cont:
3689                 list_for_each_entry(i, &ctx->table->sets, list) {
3690                         int tmp;
3691
3692                         if (!nft_is_active_next(ctx->net, set))
3693                                 continue;
3694                         if (!sscanf(i->name, name, &tmp))
3695                                 continue;
3696                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3697                                 continue;
3698
3699                         set_bit(tmp - min, inuse);
3700                 }
3701
3702                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3703                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3704                         min += BITS_PER_BYTE * PAGE_SIZE;
3705                         memset(inuse, 0, PAGE_SIZE);
3706                         goto cont;
3707                 }
3708                 free_page((unsigned long)inuse);
3709         }
3710
3711         set->name = kasprintf(GFP_KERNEL, name, min + n);
3712         if (!set->name)
3713                 return -ENOMEM;
3714
3715         list_for_each_entry(i, &ctx->table->sets, list) {
3716                 if (!nft_is_active_next(ctx->net, i))
3717                         continue;
3718                 if (!strcmp(set->name, i->name)) {
3719                         kfree(set->name);
3720                         set->name = NULL;
3721                         return -ENFILE;
3722                 }
3723         }
3724         return 0;
3725 }
3726
3727 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3728 {
3729         u64 ms = be64_to_cpu(nla_get_be64(nla));
3730         u64 max = (u64)(~((u64)0));
3731
3732         max = div_u64(max, NSEC_PER_MSEC);
3733         if (ms >= max)
3734                 return -ERANGE;
3735
3736         ms *= NSEC_PER_MSEC;
3737         *result = nsecs_to_jiffies64(ms);
3738         return 0;
3739 }
3740
3741 __be64 nf_jiffies64_to_msecs(u64 input)
3742 {
3743         return cpu_to_be64(jiffies64_to_msecs(input));
3744 }
3745
3746 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3747                                      const struct nft_set *set)
3748 {
3749         struct nlattr *concat, *field;
3750         int i;
3751
3752         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3753         if (!concat)
3754                 return -ENOMEM;
3755
3756         for (i = 0; i < set->field_count; i++) {
3757                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3758                 if (!field)
3759                         return -ENOMEM;
3760
3761                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3762                                  htonl(set->field_len[i])))
3763                         return -ENOMEM;
3764
3765                 nla_nest_end(skb, field);
3766         }
3767
3768         nla_nest_end(skb, concat);
3769
3770         return 0;
3771 }
3772
3773 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3774                               const struct nft_set *set, u16 event, u16 flags)
3775 {
3776         struct nfgenmsg *nfmsg;
3777         struct nlmsghdr *nlh;
3778         u32 portid = ctx->portid;
3779         struct nlattr *nest;
3780         u32 seq = ctx->seq;
3781
3782         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3783         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3784                         flags);
3785         if (nlh == NULL)
3786                 goto nla_put_failure;
3787
3788         nfmsg = nlmsg_data(nlh);
3789         nfmsg->nfgen_family     = ctx->family;
3790         nfmsg->version          = NFNETLINK_V0;
3791         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3792
3793         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3794                 goto nla_put_failure;
3795         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3796                 goto nla_put_failure;
3797         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3798                          NFTA_SET_PAD))
3799                 goto nla_put_failure;
3800         if (set->flags != 0)
3801                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3802                         goto nla_put_failure;
3803
3804         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3805                 goto nla_put_failure;
3806         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3807                 goto nla_put_failure;
3808         if (set->flags & NFT_SET_MAP) {
3809                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3810                         goto nla_put_failure;
3811                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3812                         goto nla_put_failure;
3813         }
3814         if (set->flags & NFT_SET_OBJECT &&
3815             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3816                 goto nla_put_failure;
3817
3818         if (set->timeout &&
3819             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3820                          nf_jiffies64_to_msecs(set->timeout),
3821                          NFTA_SET_PAD))
3822                 goto nla_put_failure;
3823         if (set->gc_int &&
3824             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3825                 goto nla_put_failure;
3826
3827         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3828                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3829                         goto nla_put_failure;
3830         }
3831
3832         if (set->udata &&
3833             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3834                 goto nla_put_failure;
3835
3836         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3837         if (!nest)
3838                 goto nla_put_failure;
3839         if (set->size &&
3840             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3841                 goto nla_put_failure;
3842
3843         if (set->field_count > 1 &&
3844             nf_tables_fill_set_concat(skb, set))
3845                 goto nla_put_failure;
3846
3847         nla_nest_end(skb, nest);
3848
3849         if (set->expr) {
3850                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3851                 if (nf_tables_fill_expr_info(skb, set->expr) < 0)
3852                         goto nla_put_failure;
3853
3854                 nla_nest_end(skb, nest);
3855         }
3856
3857         nlmsg_end(skb, nlh);
3858         return 0;
3859
3860 nla_put_failure:
3861         nlmsg_trim(skb, nlh);
3862         return -1;
3863 }
3864
3865 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3866                                  const struct nft_set *set, int event,
3867                                  gfp_t gfp_flags)
3868 {
3869         struct sk_buff *skb;
3870         u32 portid = ctx->portid;
3871         int err;
3872         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3873                               ctx->table->name, ctx->table->handle,
3874                               set->name, set->handle);
3875
3876         audit_log_nfcfg(buf,
3877                         ctx->family,
3878                         set->field_count,
3879                         event == NFT_MSG_NEWSET ?
3880                                 AUDIT_NFT_OP_SET_REGISTER :
3881                                 AUDIT_NFT_OP_SET_UNREGISTER,
3882                         gfp_flags);
3883         kfree(buf);
3884
3885         if (!ctx->report &&
3886             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3887                 return;
3888
3889         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3890         if (skb == NULL)
3891                 goto err;
3892
3893         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3894         if (err < 0) {
3895                 kfree_skb(skb);
3896                 goto err;
3897         }
3898
3899         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3900         return;
3901 err:
3902         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3903 }
3904
3905 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3906 {
3907         const struct nft_set *set;
3908         unsigned int idx, s_idx = cb->args[0];
3909         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3910         struct net *net = sock_net(skb->sk);
3911         struct nft_ctx *ctx = cb->data, ctx_set;
3912
3913         if (cb->args[1])
3914                 return skb->len;
3915
3916         rcu_read_lock();
3917         cb->seq = net->nft.base_seq;
3918
3919         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3920                 if (ctx->family != NFPROTO_UNSPEC &&
3921                     ctx->family != table->family)
3922                         continue;
3923
3924                 if (ctx->table && ctx->table != table)
3925                         continue;
3926
3927                 if (cur_table) {
3928                         if (cur_table != table)
3929                                 continue;
3930
3931                         cur_table = NULL;
3932                 }
3933                 idx = 0;
3934                 list_for_each_entry_rcu(set, &table->sets, list) {
3935                         if (idx < s_idx)
3936                                 goto cont;
3937                         if (!nft_is_active(net, set))
3938                                 goto cont;
3939
3940                         ctx_set = *ctx;
3941                         ctx_set.table = table;
3942                         ctx_set.family = table->family;
3943
3944                         if (nf_tables_fill_set(skb, &ctx_set, set,
3945                                                NFT_MSG_NEWSET,
3946                                                NLM_F_MULTI) < 0) {
3947                                 cb->args[0] = idx;
3948                                 cb->args[2] = (unsigned long) table;
3949                                 goto done;
3950                         }
3951                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3952 cont:
3953                         idx++;
3954                 }
3955                 if (s_idx)
3956                         s_idx = 0;
3957         }
3958         cb->args[1] = 1;
3959 done:
3960         rcu_read_unlock();
3961         return skb->len;
3962 }
3963
3964 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3965 {
3966         struct nft_ctx *ctx_dump = NULL;
3967
3968         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3969         if (ctx_dump == NULL)
3970                 return -ENOMEM;
3971
3972         cb->data = ctx_dump;
3973         return 0;
3974 }
3975
3976 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3977 {
3978         kfree(cb->data);
3979         return 0;
3980 }
3981
3982 /* called with rcu_read_lock held */
3983 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3984                             struct sk_buff *skb, const struct nlmsghdr *nlh,
3985                             const struct nlattr * const nla[],
3986                             struct netlink_ext_ack *extack)
3987 {
3988         u8 genmask = nft_genmask_cur(net);
3989         const struct nft_set *set;
3990         struct nft_ctx ctx;
3991         struct sk_buff *skb2;
3992         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3993         int err;
3994
3995         /* Verify existence before starting dump */
3996         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
3997                                         genmask);
3998         if (err < 0)
3999                 return err;
4000
4001         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4002                 struct netlink_dump_control c = {
4003                         .start = nf_tables_dump_sets_start,
4004                         .dump = nf_tables_dump_sets,
4005                         .done = nf_tables_dump_sets_done,
4006                         .data = &ctx,
4007                         .module = THIS_MODULE,
4008                 };
4009
4010                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4011         }
4012
4013         /* Only accept unspec with dump */
4014         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4015                 return -EAFNOSUPPORT;
4016         if (!nla[NFTA_SET_TABLE])
4017                 return -EINVAL;
4018
4019         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4020         if (IS_ERR(set))
4021                 return PTR_ERR(set);
4022
4023         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4024         if (skb2 == NULL)
4025                 return -ENOMEM;
4026
4027         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4028         if (err < 0)
4029                 goto err_fill_set_info;
4030
4031         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4032
4033 err_fill_set_info:
4034         kfree_skb(skb2);
4035         return err;
4036 }
4037
4038 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4039         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4040 };
4041
4042 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4043                                      struct nft_set_desc *desc)
4044 {
4045         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4046         u32 len;
4047         int err;
4048
4049         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4050                                           nft_concat_policy, NULL);
4051         if (err < 0)
4052                 return err;
4053
4054         if (!tb[NFTA_SET_FIELD_LEN])
4055                 return -EINVAL;
4056
4057         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4058
4059         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4060                 return -E2BIG;
4061
4062         desc->field_len[desc->field_count++] = len;
4063
4064         return 0;
4065 }
4066
4067 static int nft_set_desc_concat(struct nft_set_desc *desc,
4068                                const struct nlattr *nla)
4069 {
4070         struct nlattr *attr;
4071         int rem, err;
4072
4073         nla_for_each_nested(attr, nla, rem) {
4074                 if (nla_type(attr) != NFTA_LIST_ELEM)
4075                         return -EINVAL;
4076
4077                 err = nft_set_desc_concat_parse(attr, desc);
4078                 if (err < 0)
4079                         return err;
4080         }
4081
4082         return 0;
4083 }
4084
4085 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4086                                     const struct nlattr *nla)
4087 {
4088         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4089         int err;
4090
4091         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4092                                           nft_set_desc_policy, NULL);
4093         if (err < 0)
4094                 return err;
4095
4096         if (da[NFTA_SET_DESC_SIZE] != NULL)
4097                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4098         if (da[NFTA_SET_DESC_CONCAT])
4099                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4100
4101         return err;
4102 }
4103
4104 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4105                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4106                             const struct nlattr * const nla[],
4107                             struct netlink_ext_ack *extack)
4108 {
4109         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4110         u8 genmask = nft_genmask_next(net);
4111         int family = nfmsg->nfgen_family;
4112         const struct nft_set_ops *ops;
4113         struct nft_expr *expr = NULL;
4114         struct nft_table *table;
4115         struct nft_set *set;
4116         struct nft_ctx ctx;
4117         char *name;
4118         u64 size;
4119         u64 timeout;
4120         u32 ktype, dtype, flags, policy, gc_int, objtype;
4121         struct nft_set_desc desc;
4122         unsigned char *udata;
4123         u16 udlen;
4124         int err;
4125         int i;
4126
4127         if (nla[NFTA_SET_TABLE] == NULL ||
4128             nla[NFTA_SET_NAME] == NULL ||
4129             nla[NFTA_SET_KEY_LEN] == NULL ||
4130             nla[NFTA_SET_ID] == NULL)
4131                 return -EINVAL;
4132
4133         memset(&desc, 0, sizeof(desc));
4134
4135         ktype = NFT_DATA_VALUE;
4136         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4137                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4138                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4139                         return -EINVAL;
4140         }
4141
4142         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4143         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4144                 return -EINVAL;
4145
4146         flags = 0;
4147         if (nla[NFTA_SET_FLAGS] != NULL) {
4148                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4149                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4150                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4151                               NFT_SET_MAP | NFT_SET_EVAL |
4152                               NFT_SET_OBJECT | NFT_SET_CONCAT))
4153                         return -EOPNOTSUPP;
4154                 /* Only one of these operations is supported */
4155                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4156                              (NFT_SET_MAP | NFT_SET_OBJECT))
4157                         return -EOPNOTSUPP;
4158                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4159                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4160                         return -EOPNOTSUPP;
4161         }
4162
4163         dtype = 0;
4164         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4165                 if (!(flags & NFT_SET_MAP))
4166                         return -EINVAL;
4167
4168                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4169                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4170                     dtype != NFT_DATA_VERDICT)
4171                         return -EINVAL;
4172
4173                 if (dtype != NFT_DATA_VERDICT) {
4174                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4175                                 return -EINVAL;
4176                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4177                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4178                                 return -EINVAL;
4179                 } else
4180                         desc.dlen = sizeof(struct nft_verdict);
4181         } else if (flags & NFT_SET_MAP)
4182                 return -EINVAL;
4183
4184         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4185                 if (!(flags & NFT_SET_OBJECT))
4186                         return -EINVAL;
4187
4188                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4189                 if (objtype == NFT_OBJECT_UNSPEC ||
4190                     objtype > NFT_OBJECT_MAX)
4191                         return -EOPNOTSUPP;
4192         } else if (flags & NFT_SET_OBJECT)
4193                 return -EINVAL;
4194         else
4195                 objtype = NFT_OBJECT_UNSPEC;
4196
4197         timeout = 0;
4198         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4199                 if (!(flags & NFT_SET_TIMEOUT))
4200                         return -EINVAL;
4201
4202                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4203                 if (err)
4204                         return err;
4205         }
4206         gc_int = 0;
4207         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4208                 if (!(flags & NFT_SET_TIMEOUT))
4209                         return -EINVAL;
4210                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4211         }
4212
4213         policy = NFT_SET_POL_PERFORMANCE;
4214         if (nla[NFTA_SET_POLICY] != NULL)
4215                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4216
4217         if (nla[NFTA_SET_DESC] != NULL) {
4218                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4219                 if (err < 0)
4220                         return err;
4221         }
4222
4223         if (nla[NFTA_SET_EXPR])
4224                 desc.expr = true;
4225
4226         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4227         if (IS_ERR(table)) {
4228                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4229                 return PTR_ERR(table);
4230         }
4231
4232         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4233
4234         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4235         if (IS_ERR(set)) {
4236                 if (PTR_ERR(set) != -ENOENT) {
4237                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4238                         return PTR_ERR(set);
4239                 }
4240         } else {
4241                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4242                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4243                         return -EEXIST;
4244                 }
4245                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4246                         return -EOPNOTSUPP;
4247
4248                 return 0;
4249         }
4250
4251         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4252                 return -ENOENT;
4253
4254         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4255         if (IS_ERR(ops))
4256                 return PTR_ERR(ops);
4257
4258         udlen = 0;
4259         if (nla[NFTA_SET_USERDATA])
4260                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4261
4262         size = 0;
4263         if (ops->privsize != NULL)
4264                 size = ops->privsize(nla, &desc);
4265
4266         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4267         if (!set)
4268                 return -ENOMEM;
4269
4270         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4271         if (!name) {
4272                 err = -ENOMEM;
4273                 goto err_set_name;
4274         }
4275
4276         err = nf_tables_set_alloc_name(&ctx, set, name);
4277         kfree(name);
4278         if (err < 0)
4279                 goto err_set_alloc_name;
4280
4281         if (nla[NFTA_SET_EXPR]) {
4282                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4283                 if (IS_ERR(expr)) {
4284                         err = PTR_ERR(expr);
4285                         goto err_set_alloc_name;
4286                 }
4287         }
4288
4289         udata = NULL;
4290         if (udlen) {
4291                 udata = set->data + size;
4292                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4293         }
4294
4295         INIT_LIST_HEAD(&set->bindings);
4296         set->table = table;
4297         write_pnet(&set->net, net);
4298         set->ops   = ops;
4299         set->ktype = ktype;
4300         set->klen  = desc.klen;
4301         set->dtype = dtype;
4302         set->objtype = objtype;
4303         set->dlen  = desc.dlen;
4304         set->expr = expr;
4305         set->flags = flags;
4306         set->size  = desc.size;
4307         set->policy = policy;
4308         set->udlen  = udlen;
4309         set->udata  = udata;
4310         set->timeout = timeout;
4311         set->gc_int = gc_int;
4312         set->handle = nf_tables_alloc_handle(table);
4313
4314         set->field_count = desc.field_count;
4315         for (i = 0; i < desc.field_count; i++)
4316                 set->field_len[i] = desc.field_len[i];
4317
4318         err = ops->init(set, &desc, nla);
4319         if (err < 0)
4320                 goto err_set_init;
4321
4322         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4323         if (err < 0)
4324                 goto err_set_trans;
4325
4326         list_add_tail_rcu(&set->list, &table->sets);
4327         table->use++;
4328         return 0;
4329
4330 err_set_trans:
4331         ops->destroy(set);
4332 err_set_init:
4333         if (expr)
4334                 nft_expr_destroy(&ctx, expr);
4335 err_set_alloc_name:
4336         kfree(set->name);
4337 err_set_name:
4338         kvfree(set);
4339         return err;
4340 }
4341
4342 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4343 {
4344         if (WARN_ON(set->use > 0))
4345                 return;
4346
4347         if (set->expr)
4348                 nft_expr_destroy(ctx, set->expr);
4349
4350         set->ops->destroy(set);
4351         kfree(set->name);
4352         kvfree(set);
4353 }
4354
4355 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4356                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4357                             const struct nlattr * const nla[],
4358                             struct netlink_ext_ack *extack)
4359 {
4360         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4361         u8 genmask = nft_genmask_next(net);
4362         const struct nlattr *attr;
4363         struct nft_set *set;
4364         struct nft_ctx ctx;
4365         int err;
4366
4367         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4368                 return -EAFNOSUPPORT;
4369         if (nla[NFTA_SET_TABLE] == NULL)
4370                 return -EINVAL;
4371
4372         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4373                                         genmask);
4374         if (err < 0)
4375                 return err;
4376
4377         if (nla[NFTA_SET_HANDLE]) {
4378                 attr = nla[NFTA_SET_HANDLE];
4379                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4380         } else {
4381                 attr = nla[NFTA_SET_NAME];
4382                 set = nft_set_lookup(ctx.table, attr, genmask);
4383         }
4384
4385         if (IS_ERR(set)) {
4386                 NL_SET_BAD_ATTR(extack, attr);
4387                 return PTR_ERR(set);
4388         }
4389         if (set->use ||
4390             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4391                 NL_SET_BAD_ATTR(extack, attr);
4392                 return -EBUSY;
4393         }
4394
4395         return nft_delset(&ctx, set);
4396 }
4397
4398 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4399                                         struct nft_set *set,
4400                                         const struct nft_set_iter *iter,
4401                                         struct nft_set_elem *elem)
4402 {
4403         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4404         enum nft_registers dreg;
4405
4406         dreg = nft_type_to_reg(set->dtype);
4407         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4408                                            set->dtype == NFT_DATA_VERDICT ?
4409                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4410                                            set->dlen);
4411 }
4412
4413 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4414                        struct nft_set_binding *binding)
4415 {
4416         struct nft_set_binding *i;
4417         struct nft_set_iter iter;
4418
4419         if (set->use == UINT_MAX)
4420                 return -EOVERFLOW;
4421
4422         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4423                 return -EBUSY;
4424
4425         if (binding->flags & NFT_SET_MAP) {
4426                 /* If the set is already bound to the same chain all
4427                  * jumps are already validated for that chain.
4428                  */
4429                 list_for_each_entry(i, &set->bindings, list) {
4430                         if (i->flags & NFT_SET_MAP &&
4431                             i->chain == binding->chain)
4432                                 goto bind;
4433                 }
4434
4435                 iter.genmask    = nft_genmask_next(ctx->net);
4436                 iter.skip       = 0;
4437                 iter.count      = 0;
4438                 iter.err        = 0;
4439                 iter.fn         = nf_tables_bind_check_setelem;
4440
4441                 set->ops->walk(ctx, set, &iter);
4442                 if (iter.err < 0)
4443                         return iter.err;
4444         }
4445 bind:
4446         binding->chain = ctx->chain;
4447         list_add_tail_rcu(&binding->list, &set->bindings);
4448         nft_set_trans_bind(ctx, set);
4449         set->use++;
4450
4451         return 0;
4452 }
4453 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4454
4455 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4456                                  struct nft_set_binding *binding, bool event)
4457 {
4458         list_del_rcu(&binding->list);
4459
4460         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4461                 list_del_rcu(&set->list);
4462                 if (event)
4463                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4464                                              GFP_KERNEL);
4465         }
4466 }
4467
4468 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4469                               struct nft_set_binding *binding,
4470                               enum nft_trans_phase phase)
4471 {
4472         switch (phase) {
4473         case NFT_TRANS_PREPARE:
4474                 set->use--;
4475                 return;
4476         case NFT_TRANS_ABORT:
4477         case NFT_TRANS_RELEASE:
4478                 set->use--;
4479                 fallthrough;
4480         default:
4481                 nf_tables_unbind_set(ctx, set, binding,
4482                                      phase == NFT_TRANS_COMMIT);
4483         }
4484 }
4485 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4486
4487 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4488 {
4489         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4490                 nft_set_destroy(ctx, set);
4491 }
4492 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4493
4494 const struct nft_set_ext_type nft_set_ext_types[] = {
4495         [NFT_SET_EXT_KEY]               = {
4496                 .align  = __alignof__(u32),
4497         },
4498         [NFT_SET_EXT_DATA]              = {
4499                 .align  = __alignof__(u32),
4500         },
4501         [NFT_SET_EXT_EXPR]              = {
4502                 .align  = __alignof__(struct nft_expr),
4503         },
4504         [NFT_SET_EXT_OBJREF]            = {
4505                 .len    = sizeof(struct nft_object *),
4506                 .align  = __alignof__(struct nft_object *),
4507         },
4508         [NFT_SET_EXT_FLAGS]             = {
4509                 .len    = sizeof(u8),
4510                 .align  = __alignof__(u8),
4511         },
4512         [NFT_SET_EXT_TIMEOUT]           = {
4513                 .len    = sizeof(u64),
4514                 .align  = __alignof__(u64),
4515         },
4516         [NFT_SET_EXT_EXPIRATION]        = {
4517                 .len    = sizeof(u64),
4518                 .align  = __alignof__(u64),
4519         },
4520         [NFT_SET_EXT_USERDATA]          = {
4521                 .len    = sizeof(struct nft_userdata),
4522                 .align  = __alignof__(struct nft_userdata),
4523         },
4524         [NFT_SET_EXT_KEY_END]           = {
4525                 .align  = __alignof__(u32),
4526         },
4527 };
4528
4529 /*
4530  * Set elements
4531  */
4532
4533 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4534         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4535         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4536         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4537         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4538         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4539         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4540                                             .len = NFT_USERDATA_MAXLEN },
4541         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4542         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4543                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4544         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4545 };
4546
4547 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4548         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4549                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4550         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4551                                             .len = NFT_SET_MAXNAMELEN - 1 },
4552         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4553         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4554 };
4555
4556 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4557                                       const struct sk_buff *skb,
4558                                       const struct nlmsghdr *nlh,
4559                                       const struct nlattr * const nla[],
4560                                       struct netlink_ext_ack *extack,
4561                                       u8 genmask)
4562 {
4563         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4564         int family = nfmsg->nfgen_family;
4565         struct nft_table *table;
4566
4567         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4568                                  genmask);
4569         if (IS_ERR(table)) {
4570                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4571                 return PTR_ERR(table);
4572         }
4573
4574         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4575         return 0;
4576 }
4577
4578 static int nf_tables_fill_setelem(struct sk_buff *skb,
4579                                   const struct nft_set *set,
4580                                   const struct nft_set_elem *elem)
4581 {
4582         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4583         unsigned char *b = skb_tail_pointer(skb);
4584         struct nlattr *nest;
4585
4586         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4587         if (nest == NULL)
4588                 goto nla_put_failure;
4589
4590         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4591                           NFT_DATA_VALUE, set->klen) < 0)
4592                 goto nla_put_failure;
4593
4594         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4595             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4596                           NFT_DATA_VALUE, set->klen) < 0)
4597                 goto nla_put_failure;
4598
4599         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4600             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4601                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4602                           set->dlen) < 0)
4603                 goto nla_put_failure;
4604
4605         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4606             nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4607                 goto nla_put_failure;
4608
4609         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4610             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4611                            (*nft_set_ext_obj(ext))->key.name) < 0)
4612                 goto nla_put_failure;
4613
4614         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4615             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4616                          htonl(*nft_set_ext_flags(ext))))
4617                 goto nla_put_failure;
4618
4619         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4620             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4621                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4622                          NFTA_SET_ELEM_PAD))
4623                 goto nla_put_failure;
4624
4625         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4626                 u64 expires, now = get_jiffies_64();
4627
4628                 expires = *nft_set_ext_expiration(ext);
4629                 if (time_before64(now, expires))
4630                         expires -= now;
4631                 else
4632                         expires = 0;
4633
4634                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4635                                  nf_jiffies64_to_msecs(expires),
4636                                  NFTA_SET_ELEM_PAD))
4637                         goto nla_put_failure;
4638         }
4639
4640         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4641                 struct nft_userdata *udata;
4642
4643                 udata = nft_set_ext_userdata(ext);
4644                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4645                             udata->len + 1, udata->data))
4646                         goto nla_put_failure;
4647         }
4648
4649         nla_nest_end(skb, nest);
4650         return 0;
4651
4652 nla_put_failure:
4653         nlmsg_trim(skb, b);
4654         return -EMSGSIZE;
4655 }
4656
4657 struct nft_set_dump_args {
4658         const struct netlink_callback   *cb;
4659         struct nft_set_iter             iter;
4660         struct sk_buff                  *skb;
4661 };
4662
4663 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4664                                   struct nft_set *set,
4665                                   const struct nft_set_iter *iter,
4666                                   struct nft_set_elem *elem)
4667 {
4668         struct nft_set_dump_args *args;
4669
4670         args = container_of(iter, struct nft_set_dump_args, iter);
4671         return nf_tables_fill_setelem(args->skb, set, elem);
4672 }
4673
4674 struct nft_set_dump_ctx {
4675         const struct nft_set    *set;
4676         struct nft_ctx          ctx;
4677 };
4678
4679 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4680 {
4681         struct nft_set_dump_ctx *dump_ctx = cb->data;
4682         struct net *net = sock_net(skb->sk);
4683         struct nft_table *table;
4684         struct nft_set *set;
4685         struct nft_set_dump_args args;
4686         bool set_found = false;
4687         struct nfgenmsg *nfmsg;
4688         struct nlmsghdr *nlh;
4689         struct nlattr *nest;
4690         u32 portid, seq;
4691         int event;
4692
4693         rcu_read_lock();
4694         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4695                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4696                     dump_ctx->ctx.family != table->family)
4697                         continue;
4698
4699                 if (table != dump_ctx->ctx.table)
4700                         continue;
4701
4702                 list_for_each_entry_rcu(set, &table->sets, list) {
4703                         if (set == dump_ctx->set) {
4704                                 set_found = true;
4705                                 break;
4706                         }
4707                 }
4708                 break;
4709         }
4710
4711         if (!set_found) {
4712                 rcu_read_unlock();
4713                 return -ENOENT;
4714         }
4715
4716         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4717         portid = NETLINK_CB(cb->skb).portid;
4718         seq    = cb->nlh->nlmsg_seq;
4719
4720         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4721                         NLM_F_MULTI);
4722         if (nlh == NULL)
4723                 goto nla_put_failure;
4724
4725         nfmsg = nlmsg_data(nlh);
4726         nfmsg->nfgen_family = table->family;
4727         nfmsg->version      = NFNETLINK_V0;
4728         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4729
4730         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4731                 goto nla_put_failure;
4732         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4733                 goto nla_put_failure;
4734
4735         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4736         if (nest == NULL)
4737                 goto nla_put_failure;
4738
4739         args.cb                 = cb;
4740         args.skb                = skb;
4741         args.iter.genmask       = nft_genmask_cur(net);
4742         args.iter.skip          = cb->args[0];
4743         args.iter.count         = 0;
4744         args.iter.err           = 0;
4745         args.iter.fn            = nf_tables_dump_setelem;
4746         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4747         rcu_read_unlock();
4748
4749         nla_nest_end(skb, nest);
4750         nlmsg_end(skb, nlh);
4751
4752         if (args.iter.err && args.iter.err != -EMSGSIZE)
4753                 return args.iter.err;
4754         if (args.iter.count == cb->args[0])
4755                 return 0;
4756
4757         cb->args[0] = args.iter.count;
4758         return skb->len;
4759
4760 nla_put_failure:
4761         rcu_read_unlock();
4762         return -ENOSPC;
4763 }
4764
4765 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4766 {
4767         struct nft_set_dump_ctx *dump_ctx = cb->data;
4768
4769         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4770
4771         return cb->data ? 0 : -ENOMEM;
4772 }
4773
4774 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4775 {
4776         kfree(cb->data);
4777         return 0;
4778 }
4779
4780 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4781                                        const struct nft_ctx *ctx, u32 seq,
4782                                        u32 portid, int event, u16 flags,
4783                                        const struct nft_set *set,
4784                                        const struct nft_set_elem *elem)
4785 {
4786         struct nfgenmsg *nfmsg;
4787         struct nlmsghdr *nlh;
4788         struct nlattr *nest;
4789         int err;
4790
4791         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4792         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4793                         flags);
4794         if (nlh == NULL)
4795                 goto nla_put_failure;
4796
4797         nfmsg = nlmsg_data(nlh);
4798         nfmsg->nfgen_family     = ctx->family;
4799         nfmsg->version          = NFNETLINK_V0;
4800         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4801
4802         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4803                 goto nla_put_failure;
4804         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4805                 goto nla_put_failure;
4806
4807         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4808         if (nest == NULL)
4809                 goto nla_put_failure;
4810
4811         err = nf_tables_fill_setelem(skb, set, elem);
4812         if (err < 0)
4813                 goto nla_put_failure;
4814
4815         nla_nest_end(skb, nest);
4816
4817         nlmsg_end(skb, nlh);
4818         return 0;
4819
4820 nla_put_failure:
4821         nlmsg_trim(skb, nlh);
4822         return -1;
4823 }
4824
4825 static int nft_setelem_parse_flags(const struct nft_set *set,
4826                                    const struct nlattr *attr, u32 *flags)
4827 {
4828         if (attr == NULL)
4829                 return 0;
4830
4831         *flags = ntohl(nla_get_be32(attr));
4832         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4833                 return -EINVAL;
4834         if (!(set->flags & NFT_SET_INTERVAL) &&
4835             *flags & NFT_SET_ELEM_INTERVAL_END)
4836                 return -EINVAL;
4837
4838         return 0;
4839 }
4840
4841 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4842                                  struct nft_data *key, struct nlattr *attr)
4843 {
4844         struct nft_data_desc desc;
4845         int err;
4846
4847         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4848         if (err < 0)
4849                 return err;
4850
4851         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4852                 nft_data_release(key, desc.type);
4853                 return -EINVAL;
4854         }
4855
4856         return 0;
4857 }
4858
4859 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4860                                   struct nft_data_desc *desc,
4861                                   struct nft_data *data,
4862                                   struct nlattr *attr)
4863 {
4864         int err;
4865
4866         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4867         if (err < 0)
4868                 return err;
4869
4870         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4871                 nft_data_release(data, desc->type);
4872                 return -EINVAL;
4873         }
4874
4875         return 0;
4876 }
4877
4878 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4879                             const struct nlattr *attr)
4880 {
4881         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4882         struct nft_set_elem elem;
4883         struct sk_buff *skb;
4884         uint32_t flags = 0;
4885         void *priv;
4886         int err;
4887
4888         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4889                                           nft_set_elem_policy, NULL);
4890         if (err < 0)
4891                 return err;
4892
4893         if (!nla[NFTA_SET_ELEM_KEY])
4894                 return -EINVAL;
4895
4896         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4897         if (err < 0)
4898                 return err;
4899
4900         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4901                                     nla[NFTA_SET_ELEM_KEY]);
4902         if (err < 0)
4903                 return err;
4904
4905         if (nla[NFTA_SET_ELEM_KEY_END]) {
4906                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4907                                             nla[NFTA_SET_ELEM_KEY_END]);
4908                 if (err < 0)
4909                         return err;
4910         }
4911
4912         priv = set->ops->get(ctx->net, set, &elem, flags);
4913         if (IS_ERR(priv))
4914                 return PTR_ERR(priv);
4915
4916         elem.priv = priv;
4917
4918         err = -ENOMEM;
4919         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4920         if (skb == NULL)
4921                 return err;
4922
4923         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4924                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
4925         if (err < 0)
4926                 goto err_fill_setelem;
4927
4928         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4929
4930 err_fill_setelem:
4931         kfree_skb(skb);
4932         return err;
4933 }
4934
4935 /* called with rcu_read_lock held */
4936 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4937                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
4938                                 const struct nlattr * const nla[],
4939                                 struct netlink_ext_ack *extack)
4940 {
4941         u8 genmask = nft_genmask_cur(net);
4942         struct nft_set *set;
4943         struct nlattr *attr;
4944         struct nft_ctx ctx;
4945         int rem, err = 0;
4946
4947         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4948                                          genmask);
4949         if (err < 0)
4950                 return err;
4951
4952         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4953         if (IS_ERR(set))
4954                 return PTR_ERR(set);
4955
4956         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4957                 struct netlink_dump_control c = {
4958                         .start = nf_tables_dump_set_start,
4959                         .dump = nf_tables_dump_set,
4960                         .done = nf_tables_dump_set_done,
4961                         .module = THIS_MODULE,
4962                 };
4963                 struct nft_set_dump_ctx dump_ctx = {
4964                         .set = set,
4965                         .ctx = ctx,
4966                 };
4967
4968                 c.data = &dump_ctx;
4969                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4970         }
4971
4972         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4973                 return -EINVAL;
4974
4975         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4976                 err = nft_get_set_elem(&ctx, set, attr);
4977                 if (err < 0)
4978                         break;
4979         }
4980
4981         return err;
4982 }
4983
4984 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4985                                      const struct nft_set *set,
4986                                      const struct nft_set_elem *elem,
4987                                      int event, u16 flags)
4988 {
4989         struct net *net = ctx->net;
4990         u32 portid = ctx->portid;
4991         struct sk_buff *skb;
4992         int err;
4993         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
4994                               ctx->table->name, ctx->table->handle,
4995                               set->name, set->handle);
4996
4997         audit_log_nfcfg(buf,
4998                         ctx->family,
4999                         set->handle,
5000                         event == NFT_MSG_NEWSETELEM ?
5001                                 AUDIT_NFT_OP_SETELEM_REGISTER :
5002                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5003                         GFP_KERNEL);
5004         kfree(buf);
5005
5006         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5007                 return;
5008
5009         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5010         if (skb == NULL)
5011                 goto err;
5012
5013         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5014                                           set, elem);
5015         if (err < 0) {
5016                 kfree_skb(skb);
5017                 goto err;
5018         }
5019
5020         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5021         return;
5022 err:
5023         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5024 }
5025
5026 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5027                                               int msg_type,
5028                                               struct nft_set *set)
5029 {
5030         struct nft_trans *trans;
5031
5032         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5033         if (trans == NULL)
5034                 return NULL;
5035
5036         nft_trans_elem_set(trans) = set;
5037         return trans;
5038 }
5039
5040 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5041                                          const struct nft_set *set,
5042                                          const struct nlattr *attr)
5043 {
5044         struct nft_expr *expr;
5045         int err;
5046
5047         expr = nft_expr_init(ctx, attr);
5048         if (IS_ERR(expr))
5049                 return expr;
5050
5051         err = -EOPNOTSUPP;
5052         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5053                 goto err_set_elem_expr;
5054
5055         if (expr->ops->type->flags & NFT_EXPR_GC) {
5056                 if (set->flags & NFT_SET_TIMEOUT)
5057                         goto err_set_elem_expr;
5058                 if (!set->ops->gc_init)
5059                         goto err_set_elem_expr;
5060                 set->ops->gc_init(set);
5061         }
5062
5063         return expr;
5064
5065 err_set_elem_expr:
5066         nft_expr_destroy(ctx, expr);
5067         return ERR_PTR(err);
5068 }
5069
5070 void *nft_set_elem_init(const struct nft_set *set,
5071                         const struct nft_set_ext_tmpl *tmpl,
5072                         const u32 *key, const u32 *key_end,
5073                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5074 {
5075         struct nft_set_ext *ext;
5076         void *elem;
5077
5078         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5079         if (elem == NULL)
5080                 return NULL;
5081
5082         ext = nft_set_elem_ext(set, elem);
5083         nft_set_ext_init(ext, tmpl);
5084
5085         memcpy(nft_set_ext_key(ext), key, set->klen);
5086         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5087                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5088         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5089                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5090         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5091                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5092                 if (expiration == 0)
5093                         *nft_set_ext_expiration(ext) += timeout;
5094         }
5095         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5096                 *nft_set_ext_timeout(ext) = timeout;
5097
5098         return elem;
5099 }
5100
5101 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5102                                       struct nft_expr *expr)
5103 {
5104         if (expr->ops->destroy_clone) {
5105                 expr->ops->destroy_clone(ctx, expr);
5106                 module_put(expr->ops->type->owner);
5107         } else {
5108                 nf_tables_expr_destroy(ctx, expr);
5109         }
5110 }
5111
5112 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5113                           bool destroy_expr)
5114 {
5115         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5116         struct nft_ctx ctx = {
5117                 .net    = read_pnet(&set->net),
5118                 .family = set->table->family,
5119         };
5120
5121         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5122         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5123                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5124         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5125                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5126
5127         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5128                 (*nft_set_ext_obj(ext))->use--;
5129         kfree(elem);
5130 }
5131 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5132
5133 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5134  * the refcounting from the preparation phase.
5135  */
5136 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5137                                        const struct nft_set *set, void *elem)
5138 {
5139         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5140
5141         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5142                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5143
5144         kfree(elem);
5145 }
5146
5147 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5148                             const struct nlattr *attr, u32 nlmsg_flags)
5149 {
5150         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5151         u8 genmask = nft_genmask_next(ctx->net);
5152         struct nft_set_ext_tmpl tmpl;
5153         struct nft_set_ext *ext, *ext2;
5154         struct nft_set_elem elem;
5155         struct nft_set_binding *binding;
5156         struct nft_object *obj = NULL;
5157         struct nft_expr *expr = NULL;
5158         struct nft_userdata *udata;
5159         struct nft_data_desc desc;
5160         enum nft_registers dreg;
5161         struct nft_trans *trans;
5162         u32 flags = 0;
5163         u64 timeout;
5164         u64 expiration;
5165         u8 ulen;
5166         int err;
5167
5168         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5169                                           nft_set_elem_policy, NULL);
5170         if (err < 0)
5171                 return err;
5172
5173         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5174                 return -EINVAL;
5175
5176         nft_set_ext_prepare(&tmpl);
5177
5178         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5179         if (err < 0)
5180                 return err;
5181         if (flags != 0)
5182                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5183
5184         if (set->flags & NFT_SET_MAP) {
5185                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5186                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5187                         return -EINVAL;
5188         } else {
5189                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5190                         return -EINVAL;
5191         }
5192
5193         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5194              (nla[NFTA_SET_ELEM_DATA] ||
5195               nla[NFTA_SET_ELEM_OBJREF] ||
5196               nla[NFTA_SET_ELEM_TIMEOUT] ||
5197               nla[NFTA_SET_ELEM_EXPIRATION] ||
5198               nla[NFTA_SET_ELEM_USERDATA] ||
5199               nla[NFTA_SET_ELEM_EXPR]))
5200                 return -EINVAL;
5201
5202         timeout = 0;
5203         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5204                 if (!(set->flags & NFT_SET_TIMEOUT))
5205                         return -EINVAL;
5206                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5207                                             &timeout);
5208                 if (err)
5209                         return err;
5210         } else if (set->flags & NFT_SET_TIMEOUT) {
5211                 timeout = set->timeout;
5212         }
5213
5214         expiration = 0;
5215         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5216                 if (!(set->flags & NFT_SET_TIMEOUT))
5217                         return -EINVAL;
5218                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5219                                             &expiration);
5220                 if (err)
5221                         return err;
5222         }
5223
5224         if (nla[NFTA_SET_ELEM_EXPR] != NULL) {
5225                 expr = nft_set_elem_expr_alloc(ctx, set,
5226                                                nla[NFTA_SET_ELEM_EXPR]);
5227                 if (IS_ERR(expr))
5228                         return PTR_ERR(expr);
5229
5230                 err = -EOPNOTSUPP;
5231                 if (set->expr && set->expr->ops != expr->ops)
5232                         goto err_set_elem_expr;
5233         } else if (set->expr) {
5234                 expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
5235                 if (!expr)
5236                         return -ENOMEM;
5237
5238                 err = nft_expr_clone(expr, set->expr);
5239                 if (err < 0)
5240                         goto err_set_elem_expr;
5241         }
5242
5243         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5244                                     nla[NFTA_SET_ELEM_KEY]);
5245         if (err < 0)
5246                 goto err_set_elem_expr;
5247
5248         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5249
5250         if (nla[NFTA_SET_ELEM_KEY_END]) {
5251                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5252                                             nla[NFTA_SET_ELEM_KEY_END]);
5253                 if (err < 0)
5254                         goto err_parse_key;
5255
5256                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5257         }
5258
5259         if (timeout > 0) {
5260                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5261                 if (timeout != set->timeout)
5262                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5263         }
5264
5265         if (expr)
5266                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
5267                                        expr->ops->size);
5268
5269         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5270                 if (!(set->flags & NFT_SET_OBJECT)) {
5271                         err = -EINVAL;
5272                         goto err_parse_key_end;
5273                 }
5274                 obj = nft_obj_lookup(ctx->net, ctx->table,
5275                                      nla[NFTA_SET_ELEM_OBJREF],
5276                                      set->objtype, genmask);
5277                 if (IS_ERR(obj)) {
5278                         err = PTR_ERR(obj);
5279                         goto err_parse_key_end;
5280                 }
5281                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5282         }
5283
5284         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5285                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5286                                              nla[NFTA_SET_ELEM_DATA]);
5287                 if (err < 0)
5288                         goto err_parse_key_end;
5289
5290                 dreg = nft_type_to_reg(set->dtype);
5291                 list_for_each_entry(binding, &set->bindings, list) {
5292                         struct nft_ctx bind_ctx = {
5293                                 .net    = ctx->net,
5294                                 .family = ctx->family,
5295                                 .table  = ctx->table,
5296                                 .chain  = (struct nft_chain *)binding->chain,
5297                         };
5298
5299                         if (!(binding->flags & NFT_SET_MAP))
5300                                 continue;
5301
5302                         err = nft_validate_register_store(&bind_ctx, dreg,
5303                                                           &elem.data.val,
5304                                                           desc.type, desc.len);
5305                         if (err < 0)
5306                                 goto err_parse_data;
5307
5308                         if (desc.type == NFT_DATA_VERDICT &&
5309                             (elem.data.val.verdict.code == NFT_GOTO ||
5310                              elem.data.val.verdict.code == NFT_JUMP))
5311                                 nft_validate_state_update(ctx->net,
5312                                                           NFT_VALIDATE_NEED);
5313                 }
5314
5315                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5316         }
5317
5318         /* The full maximum length of userdata can exceed the maximum
5319          * offset value (U8_MAX) for following extensions, therefor it
5320          * must be the last extension added.
5321          */
5322         ulen = 0;
5323         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5324                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5325                 if (ulen > 0)
5326                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5327                                                ulen);
5328         }
5329
5330         err = -ENOMEM;
5331         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5332                                       elem.key_end.val.data, elem.data.val.data,
5333                                       timeout, expiration, GFP_KERNEL);
5334         if (elem.priv == NULL)
5335                 goto err_parse_data;
5336
5337         ext = nft_set_elem_ext(set, elem.priv);
5338         if (flags)
5339                 *nft_set_ext_flags(ext) = flags;
5340         if (ulen > 0) {
5341                 udata = nft_set_ext_userdata(ext);
5342                 udata->len = ulen - 1;
5343                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5344         }
5345         if (obj) {
5346                 *nft_set_ext_obj(ext) = obj;
5347                 obj->use++;
5348         }
5349         if (expr) {
5350                 memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
5351                 kfree(expr);
5352                 expr = NULL;
5353         }
5354
5355         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5356         if (trans == NULL)
5357                 goto err_trans;
5358
5359         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5360         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5361         if (err) {
5362                 if (err == -EEXIST) {
5363                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5364                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5365                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5366                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5367                                 goto err_element_clash;
5368                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5369                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5370                              memcmp(nft_set_ext_data(ext),
5371                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5372                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5373                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5374                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5375                                 goto err_element_clash;
5376                         else if (!(nlmsg_flags & NLM_F_EXCL))
5377                                 err = 0;
5378                 } else if (err == -ENOTEMPTY) {
5379                         /* ENOTEMPTY reports overlapping between this element
5380                          * and an existing one.
5381                          */
5382                         err = -EEXIST;
5383                 }
5384                 goto err_element_clash;
5385         }
5386
5387         if (set->size &&
5388             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5389                 err = -ENFILE;
5390                 goto err_set_full;
5391         }
5392
5393         nft_trans_elem(trans) = elem;
5394         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5395         return 0;
5396
5397 err_set_full:
5398         set->ops->remove(ctx->net, set, &elem);
5399 err_element_clash:
5400         kfree(trans);
5401 err_trans:
5402         if (obj)
5403                 obj->use--;
5404
5405         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5406 err_parse_data:
5407         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5408                 nft_data_release(&elem.data.val, desc.type);
5409 err_parse_key_end:
5410         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5411 err_parse_key:
5412         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5413 err_set_elem_expr:
5414         if (expr != NULL)
5415                 nft_expr_destroy(ctx, expr);
5416
5417         return err;
5418 }
5419
5420 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5421                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5422                                 const struct nlattr * const nla[],
5423                                 struct netlink_ext_ack *extack)
5424 {
5425         u8 genmask = nft_genmask_next(net);
5426         const struct nlattr *attr;
5427         struct nft_set *set;
5428         struct nft_ctx ctx;
5429         int rem, err;
5430
5431         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5432                 return -EINVAL;
5433
5434         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5435                                          genmask);
5436         if (err < 0)
5437                 return err;
5438
5439         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5440                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5441         if (IS_ERR(set))
5442                 return PTR_ERR(set);
5443
5444         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5445                 return -EBUSY;
5446
5447         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5448                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5449                 if (err < 0)
5450                         return err;
5451         }
5452
5453         if (net->nft.validate_state == NFT_VALIDATE_DO)
5454                 return nft_table_validate(net, ctx.table);
5455
5456         return 0;
5457 }
5458
5459 /**
5460  *      nft_data_hold - hold a nft_data item
5461  *
5462  *      @data: struct nft_data to release
5463  *      @type: type of data
5464  *
5465  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5466  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5467  *      NFT_GOTO verdicts. This function must be called on active data objects
5468  *      from the second phase of the commit protocol.
5469  */
5470 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5471 {
5472         struct nft_chain *chain;
5473         struct nft_rule *rule;
5474
5475         if (type == NFT_DATA_VERDICT) {
5476                 switch (data->verdict.code) {
5477                 case NFT_JUMP:
5478                 case NFT_GOTO:
5479                         chain = data->verdict.chain;
5480                         chain->use++;
5481
5482                         if (!nft_chain_is_bound(chain))
5483                                 break;
5484
5485                         chain->table->use++;
5486                         list_for_each_entry(rule, &chain->rules, list)
5487                                 chain->use++;
5488
5489                         nft_chain_add(chain->table, chain);
5490                         break;
5491                 }
5492         }
5493 }
5494
5495 static void nft_set_elem_activate(const struct net *net,
5496                                   const struct nft_set *set,
5497                                   struct nft_set_elem *elem)
5498 {
5499         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5500
5501         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5502                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5503         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5504                 (*nft_set_ext_obj(ext))->use++;
5505 }
5506
5507 static void nft_set_elem_deactivate(const struct net *net,
5508                                     const struct nft_set *set,
5509                                     struct nft_set_elem *elem)
5510 {
5511         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5512
5513         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5514                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5515         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5516                 (*nft_set_ext_obj(ext))->use--;
5517 }
5518
5519 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5520                            const struct nlattr *attr)
5521 {
5522         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5523         struct nft_set_ext_tmpl tmpl;
5524         struct nft_set_elem elem;
5525         struct nft_set_ext *ext;
5526         struct nft_trans *trans;
5527         u32 flags = 0;
5528         void *priv;
5529         int err;
5530
5531         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5532                                           nft_set_elem_policy, NULL);
5533         if (err < 0)
5534                 return err;
5535
5536         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5537                 return -EINVAL;
5538
5539         nft_set_ext_prepare(&tmpl);
5540
5541         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5542         if (err < 0)
5543                 return err;
5544         if (flags != 0)
5545                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5546
5547         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5548                                     nla[NFTA_SET_ELEM_KEY]);
5549         if (err < 0)
5550                 return err;
5551
5552         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5553
5554         if (nla[NFTA_SET_ELEM_KEY_END]) {
5555                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5556                                             nla[NFTA_SET_ELEM_KEY_END]);
5557                 if (err < 0)
5558                         return err;
5559
5560                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5561         }
5562
5563         err = -ENOMEM;
5564         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5565                                       elem.key_end.val.data, NULL, 0, 0,
5566                                       GFP_KERNEL);
5567         if (elem.priv == NULL)
5568                 goto fail_elem;
5569
5570         ext = nft_set_elem_ext(set, elem.priv);
5571         if (flags)
5572                 *nft_set_ext_flags(ext) = flags;
5573
5574         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5575         if (trans == NULL)
5576                 goto fail_trans;
5577
5578         priv = set->ops->deactivate(ctx->net, set, &elem);
5579         if (priv == NULL) {
5580                 err = -ENOENT;
5581                 goto fail_ops;
5582         }
5583         kfree(elem.priv);
5584         elem.priv = priv;
5585
5586         nft_set_elem_deactivate(ctx->net, set, &elem);
5587
5588         nft_trans_elem(trans) = elem;
5589         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5590         return 0;
5591
5592 fail_ops:
5593         kfree(trans);
5594 fail_trans:
5595         kfree(elem.priv);
5596 fail_elem:
5597         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5598         return err;
5599 }
5600
5601 static int nft_flush_set(const struct nft_ctx *ctx,
5602                          struct nft_set *set,
5603                          const struct nft_set_iter *iter,
5604                          struct nft_set_elem *elem)
5605 {
5606         struct nft_trans *trans;
5607         int err;
5608
5609         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5610                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5611         if (!trans)
5612                 return -ENOMEM;
5613
5614         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5615                 err = -ENOENT;
5616                 goto err1;
5617         }
5618         set->ndeact++;
5619
5620         nft_set_elem_deactivate(ctx->net, set, elem);
5621         nft_trans_elem_set(trans) = set;
5622         nft_trans_elem(trans) = *elem;
5623         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5624
5625         return 0;
5626 err1:
5627         kfree(trans);
5628         return err;
5629 }
5630
5631 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5632                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5633                                 const struct nlattr * const nla[],
5634                                 struct netlink_ext_ack *extack)
5635 {
5636         u8 genmask = nft_genmask_next(net);
5637         const struct nlattr *attr;
5638         struct nft_set *set;
5639         struct nft_ctx ctx;
5640         int rem, err = 0;
5641
5642         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5643                                          genmask);
5644         if (err < 0)
5645                 return err;
5646
5647         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5648         if (IS_ERR(set))
5649                 return PTR_ERR(set);
5650         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5651                 return -EBUSY;
5652
5653         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5654                 struct nft_set_iter iter = {
5655                         .genmask        = genmask,
5656                         .fn             = nft_flush_set,
5657                 };
5658                 set->ops->walk(&ctx, set, &iter);
5659
5660                 return iter.err;
5661         }
5662
5663         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5664                 err = nft_del_setelem(&ctx, set, attr);
5665                 if (err < 0)
5666                         break;
5667
5668                 set->ndeact++;
5669         }
5670         return err;
5671 }
5672
5673 void nft_set_gc_batch_release(struct rcu_head *rcu)
5674 {
5675         struct nft_set_gc_batch *gcb;
5676         unsigned int i;
5677
5678         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5679         for (i = 0; i < gcb->head.cnt; i++)
5680                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5681         kfree(gcb);
5682 }
5683
5684 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5685                                                 gfp_t gfp)
5686 {
5687         struct nft_set_gc_batch *gcb;
5688
5689         gcb = kzalloc(sizeof(*gcb), gfp);
5690         if (gcb == NULL)
5691                 return gcb;
5692         gcb->head.set = set;
5693         return gcb;
5694 }
5695
5696 /*
5697  * Stateful objects
5698  */
5699
5700 /**
5701  *      nft_register_obj- register nf_tables stateful object type
5702  *      @obj_type: object type
5703  *
5704  *      Registers the object type for use with nf_tables. Returns zero on
5705  *      success or a negative errno code otherwise.
5706  */
5707 int nft_register_obj(struct nft_object_type *obj_type)
5708 {
5709         if (obj_type->type == NFT_OBJECT_UNSPEC)
5710                 return -EINVAL;
5711
5712         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5713         list_add_rcu(&obj_type->list, &nf_tables_objects);
5714         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5715         return 0;
5716 }
5717 EXPORT_SYMBOL_GPL(nft_register_obj);
5718
5719 /**
5720  *      nft_unregister_obj - unregister nf_tables object type
5721  *      @obj_type: object type
5722  *
5723  *      Unregisters the object type for use with nf_tables.
5724  */
5725 void nft_unregister_obj(struct nft_object_type *obj_type)
5726 {
5727         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5728         list_del_rcu(&obj_type->list);
5729         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5730 }
5731 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5732
5733 struct nft_object *nft_obj_lookup(const struct net *net,
5734                                   const struct nft_table *table,
5735                                   const struct nlattr *nla, u32 objtype,
5736                                   u8 genmask)
5737 {
5738         struct nft_object_hash_key k = { .table = table };
5739         char search[NFT_OBJ_MAXNAMELEN];
5740         struct rhlist_head *tmp, *list;
5741         struct nft_object *obj;
5742
5743         nla_strscpy(search, nla, sizeof(search));
5744         k.name = search;
5745
5746         WARN_ON_ONCE(!rcu_read_lock_held() &&
5747                      !lockdep_commit_lock_is_held(net));
5748
5749         rcu_read_lock();
5750         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5751         if (!list)
5752                 goto out;
5753
5754         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5755                 if (objtype == obj->ops->type->type &&
5756                     nft_active_genmask(obj, genmask)) {
5757                         rcu_read_unlock();
5758                         return obj;
5759                 }
5760         }
5761 out:
5762         rcu_read_unlock();
5763         return ERR_PTR(-ENOENT);
5764 }
5765 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5766
5767 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5768                                                   const struct nlattr *nla,
5769                                                   u32 objtype, u8 genmask)
5770 {
5771         struct nft_object *obj;
5772
5773         list_for_each_entry(obj, &table->objects, list) {
5774                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5775                     objtype == obj->ops->type->type &&
5776                     nft_active_genmask(obj, genmask))
5777                         return obj;
5778         }
5779         return ERR_PTR(-ENOENT);
5780 }
5781
5782 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5783         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5784                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5785         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5786                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5787         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5788         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5789         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5790         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
5791                                     .len = NFT_USERDATA_MAXLEN },
5792 };
5793
5794 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5795                                        const struct nft_object_type *type,
5796                                        const struct nlattr *attr)
5797 {
5798         struct nlattr **tb;
5799         const struct nft_object_ops *ops;
5800         struct nft_object *obj;
5801         int err = -ENOMEM;
5802
5803         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5804         if (!tb)
5805                 goto err1;
5806
5807         if (attr) {
5808                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5809                                                   type->policy, NULL);
5810                 if (err < 0)
5811                         goto err2;
5812         } else {
5813                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5814         }
5815
5816         if (type->select_ops) {
5817                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5818                 if (IS_ERR(ops)) {
5819                         err = PTR_ERR(ops);
5820                         goto err2;
5821                 }
5822         } else {
5823                 ops = type->ops;
5824         }
5825
5826         err = -ENOMEM;
5827         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5828         if (!obj)
5829                 goto err2;
5830
5831         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5832         if (err < 0)
5833                 goto err3;
5834
5835         obj->ops = ops;
5836
5837         kfree(tb);
5838         return obj;
5839 err3:
5840         kfree(obj);
5841 err2:
5842         kfree(tb);
5843 err1:
5844         return ERR_PTR(err);
5845 }
5846
5847 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5848                            struct nft_object *obj, bool reset)
5849 {
5850         struct nlattr *nest;
5851
5852         nest = nla_nest_start_noflag(skb, attr);
5853         if (!nest)
5854                 goto nla_put_failure;
5855         if (obj->ops->dump(skb, obj, reset) < 0)
5856                 goto nla_put_failure;
5857         nla_nest_end(skb, nest);
5858         return 0;
5859
5860 nla_put_failure:
5861         return -1;
5862 }
5863
5864 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5865 {
5866         const struct nft_object_type *type;
5867
5868         list_for_each_entry(type, &nf_tables_objects, list) {
5869                 if (objtype == type->type)
5870                         return type;
5871         }
5872         return NULL;
5873 }
5874
5875 static const struct nft_object_type *
5876 nft_obj_type_get(struct net *net, u32 objtype)
5877 {
5878         const struct nft_object_type *type;
5879
5880         type = __nft_obj_type_get(objtype);
5881         if (type != NULL && try_module_get(type->owner))
5882                 return type;
5883
5884         lockdep_nfnl_nft_mutex_not_held();
5885 #ifdef CONFIG_MODULES
5886         if (type == NULL) {
5887                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5888                         return ERR_PTR(-EAGAIN);
5889         }
5890 #endif
5891         return ERR_PTR(-ENOENT);
5892 }
5893
5894 static int nf_tables_updobj(const struct nft_ctx *ctx,
5895                             const struct nft_object_type *type,
5896                             const struct nlattr *attr,
5897                             struct nft_object *obj)
5898 {
5899         struct nft_object *newobj;
5900         struct nft_trans *trans;
5901         int err;
5902
5903         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5904                                 sizeof(struct nft_trans_obj));
5905         if (!trans)
5906                 return -ENOMEM;
5907
5908         newobj = nft_obj_init(ctx, type, attr);
5909         if (IS_ERR(newobj)) {
5910                 err = PTR_ERR(newobj);
5911                 goto err_free_trans;
5912         }
5913
5914         nft_trans_obj(trans) = obj;
5915         nft_trans_obj_update(trans) = true;
5916         nft_trans_obj_newobj(trans) = newobj;
5917         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5918
5919         return 0;
5920
5921 err_free_trans:
5922         kfree(trans);
5923         return err;
5924 }
5925
5926 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5927                             struct sk_buff *skb, const struct nlmsghdr *nlh,
5928                             const struct nlattr * const nla[],
5929                             struct netlink_ext_ack *extack)
5930 {
5931         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5932         const struct nft_object_type *type;
5933         u8 genmask = nft_genmask_next(net);
5934         int family = nfmsg->nfgen_family;
5935         struct nft_table *table;
5936         struct nft_object *obj;
5937         struct nft_ctx ctx;
5938         u32 objtype;
5939         int err;
5940
5941         if (!nla[NFTA_OBJ_TYPE] ||
5942             !nla[NFTA_OBJ_NAME] ||
5943             !nla[NFTA_OBJ_DATA])
5944                 return -EINVAL;
5945
5946         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5947         if (IS_ERR(table)) {
5948                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5949                 return PTR_ERR(table);
5950         }
5951
5952         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5953         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5954         if (IS_ERR(obj)) {
5955                 err = PTR_ERR(obj);
5956                 if (err != -ENOENT) {
5957                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5958                         return err;
5959                 }
5960         } else {
5961                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5962                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5963                         return -EEXIST;
5964                 }
5965                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5966                         return -EOPNOTSUPP;
5967
5968                 type = __nft_obj_type_get(objtype);
5969                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5970
5971                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5972         }
5973
5974         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5975
5976         type = nft_obj_type_get(net, objtype);
5977         if (IS_ERR(type))
5978                 return PTR_ERR(type);
5979
5980         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5981         if (IS_ERR(obj)) {
5982                 err = PTR_ERR(obj);
5983                 goto err_init;
5984         }
5985         obj->key.table = table;
5986         obj->handle = nf_tables_alloc_handle(table);
5987
5988         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5989         if (!obj->key.name) {
5990                 err = -ENOMEM;
5991                 goto err_strdup;
5992         }
5993
5994         if (nla[NFTA_OBJ_USERDATA]) {
5995                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
5996                 if (obj->udata == NULL)
5997                         goto err_userdata;
5998
5999                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6000         }
6001
6002         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6003         if (err < 0)
6004                 goto err_trans;
6005
6006         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6007                               nft_objname_ht_params);
6008         if (err < 0)
6009                 goto err_obj_ht;
6010
6011         list_add_tail_rcu(&obj->list, &table->objects);
6012         table->use++;
6013         return 0;
6014 err_obj_ht:
6015         /* queued in transaction log */
6016         INIT_LIST_HEAD(&obj->list);
6017         return err;
6018 err_trans:
6019         kfree(obj->key.name);
6020 err_userdata:
6021         kfree(obj->udata);
6022 err_strdup:
6023         if (obj->ops->destroy)
6024                 obj->ops->destroy(&ctx, obj);
6025         kfree(obj);
6026 err_init:
6027         module_put(type->owner);
6028         return err;
6029 }
6030
6031 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6032                                    u32 portid, u32 seq, int event, u32 flags,
6033                                    int family, const struct nft_table *table,
6034                                    struct nft_object *obj, bool reset)
6035 {
6036         struct nfgenmsg *nfmsg;
6037         struct nlmsghdr *nlh;
6038
6039         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6040         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6041         if (nlh == NULL)
6042                 goto nla_put_failure;
6043
6044         nfmsg = nlmsg_data(nlh);
6045         nfmsg->nfgen_family     = family;
6046         nfmsg->version          = NFNETLINK_V0;
6047         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6048
6049         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6050             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6051             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6052             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6053             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6054             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6055                          NFTA_OBJ_PAD))
6056                 goto nla_put_failure;
6057
6058         if (obj->udata &&
6059             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6060                 goto nla_put_failure;
6061
6062         nlmsg_end(skb, nlh);
6063         return 0;
6064
6065 nla_put_failure:
6066         nlmsg_trim(skb, nlh);
6067         return -1;
6068 }
6069
6070 struct nft_obj_filter {
6071         char            *table;
6072         u32             type;
6073 };
6074
6075 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6076 {
6077         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6078         const struct nft_table *table;
6079         unsigned int idx = 0, s_idx = cb->args[0];
6080         struct nft_obj_filter *filter = cb->data;
6081         struct net *net = sock_net(skb->sk);
6082         int family = nfmsg->nfgen_family;
6083         struct nft_object *obj;
6084         bool reset = false;
6085
6086         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6087                 reset = true;
6088
6089         rcu_read_lock();
6090         cb->seq = net->nft.base_seq;
6091
6092         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6093                 if (family != NFPROTO_UNSPEC && family != table->family)
6094                         continue;
6095
6096                 list_for_each_entry_rcu(obj, &table->objects, list) {
6097                         if (!nft_is_active(net, obj))
6098                                 goto cont;
6099                         if (idx < s_idx)
6100                                 goto cont;
6101                         if (idx > s_idx)
6102                                 memset(&cb->args[1], 0,
6103                                        sizeof(cb->args) - sizeof(cb->args[0]));
6104                         if (filter && filter->table &&
6105                             strcmp(filter->table, table->name))
6106                                 goto cont;
6107                         if (filter &&
6108                             filter->type != NFT_OBJECT_UNSPEC &&
6109                             obj->ops->type->type != filter->type)
6110                                 goto cont;
6111
6112                         if (reset) {
6113                                 char *buf = kasprintf(GFP_ATOMIC,
6114                                                       "%s:%llu;?:0",
6115                                                       table->name,
6116                                                       table->handle);
6117
6118                                 audit_log_nfcfg(buf,
6119                                                 family,
6120                                                 obj->handle,
6121                                                 AUDIT_NFT_OP_OBJ_RESET,
6122                                                 GFP_ATOMIC);
6123                                 kfree(buf);
6124                         }
6125
6126                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6127                                                     cb->nlh->nlmsg_seq,
6128                                                     NFT_MSG_NEWOBJ,
6129                                                     NLM_F_MULTI | NLM_F_APPEND,
6130                                                     table->family, table,
6131                                                     obj, reset) < 0)
6132                                 goto done;
6133
6134                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6135 cont:
6136                         idx++;
6137                 }
6138         }
6139 done:
6140         rcu_read_unlock();
6141
6142         cb->args[0] = idx;
6143         return skb->len;
6144 }
6145
6146 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6147 {
6148         const struct nlattr * const *nla = cb->data;
6149         struct nft_obj_filter *filter = NULL;
6150
6151         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6152                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6153                 if (!filter)
6154                         return -ENOMEM;
6155
6156                 if (nla[NFTA_OBJ_TABLE]) {
6157                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6158                         if (!filter->table) {
6159                                 kfree(filter);
6160                                 return -ENOMEM;
6161                         }
6162                 }
6163
6164                 if (nla[NFTA_OBJ_TYPE])
6165                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6166         }
6167
6168         cb->data = filter;
6169         return 0;
6170 }
6171
6172 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6173 {
6174         struct nft_obj_filter *filter = cb->data;
6175
6176         if (filter) {
6177                 kfree(filter->table);
6178                 kfree(filter);
6179         }
6180
6181         return 0;
6182 }
6183
6184 /* called with rcu_read_lock held */
6185 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6186                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6187                             const struct nlattr * const nla[],
6188                             struct netlink_ext_ack *extack)
6189 {
6190         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6191         u8 genmask = nft_genmask_cur(net);
6192         int family = nfmsg->nfgen_family;
6193         const struct nft_table *table;
6194         struct nft_object *obj;
6195         struct sk_buff *skb2;
6196         bool reset = false;
6197         u32 objtype;
6198         int err;
6199
6200         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6201                 struct netlink_dump_control c = {
6202                         .start = nf_tables_dump_obj_start,
6203                         .dump = nf_tables_dump_obj,
6204                         .done = nf_tables_dump_obj_done,
6205                         .module = THIS_MODULE,
6206                         .data = (void *)nla,
6207                 };
6208
6209                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6210         }
6211
6212         if (!nla[NFTA_OBJ_NAME] ||
6213             !nla[NFTA_OBJ_TYPE])
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         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6224         if (IS_ERR(obj)) {
6225                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6226                 return PTR_ERR(obj);
6227         }
6228
6229         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6230         if (!skb2)
6231                 return -ENOMEM;
6232
6233         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6234                 reset = true;
6235
6236         if (reset) {
6237                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6238                                       table->name, table->handle);
6239
6240                 audit_log_nfcfg(buf,
6241                                 family,
6242                                 obj->handle,
6243                                 AUDIT_NFT_OP_OBJ_RESET,
6244                                 GFP_ATOMIC);
6245                 kfree(buf);
6246         }
6247
6248         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6249                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6250                                       family, table, obj, reset);
6251         if (err < 0)
6252                 goto err_fill_obj_info;
6253
6254         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6255
6256 err_fill_obj_info:
6257         kfree_skb(skb2);
6258         return err;
6259 }
6260
6261 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6262 {
6263         if (obj->ops->destroy)
6264                 obj->ops->destroy(ctx, obj);
6265
6266         module_put(obj->ops->type->owner);
6267         kfree(obj->key.name);
6268         kfree(obj->udata);
6269         kfree(obj);
6270 }
6271
6272 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6273                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6274                             const struct nlattr * const nla[],
6275                             struct netlink_ext_ack *extack)
6276 {
6277         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6278         u8 genmask = nft_genmask_next(net);
6279         int family = nfmsg->nfgen_family;
6280         const struct nlattr *attr;
6281         struct nft_table *table;
6282         struct nft_object *obj;
6283         struct nft_ctx ctx;
6284         u32 objtype;
6285
6286         if (!nla[NFTA_OBJ_TYPE] ||
6287             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6288                 return -EINVAL;
6289
6290         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6291         if (IS_ERR(table)) {
6292                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6293                 return PTR_ERR(table);
6294         }
6295
6296         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6297         if (nla[NFTA_OBJ_HANDLE]) {
6298                 attr = nla[NFTA_OBJ_HANDLE];
6299                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6300         } else {
6301                 attr = nla[NFTA_OBJ_NAME];
6302                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6303         }
6304
6305         if (IS_ERR(obj)) {
6306                 NL_SET_BAD_ATTR(extack, attr);
6307                 return PTR_ERR(obj);
6308         }
6309         if (obj->use > 0) {
6310                 NL_SET_BAD_ATTR(extack, attr);
6311                 return -EBUSY;
6312         }
6313
6314         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6315
6316         return nft_delobj(&ctx, obj);
6317 }
6318
6319 void nft_obj_notify(struct net *net, const struct nft_table *table,
6320                     struct nft_object *obj, u32 portid, u32 seq, int event,
6321                     int family, int report, gfp_t gfp)
6322 {
6323         struct sk_buff *skb;
6324         int err;
6325         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6326                               table->name, table->handle);
6327
6328         audit_log_nfcfg(buf,
6329                         family,
6330                         obj->handle,
6331                         event == NFT_MSG_NEWOBJ ?
6332                                 AUDIT_NFT_OP_OBJ_REGISTER :
6333                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6334                         gfp);
6335         kfree(buf);
6336
6337         if (!report &&
6338             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6339                 return;
6340
6341         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6342         if (skb == NULL)
6343                 goto err;
6344
6345         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6346                                       table, obj, false);
6347         if (err < 0) {
6348                 kfree_skb(skb);
6349                 goto err;
6350         }
6351
6352         nft_notify_enqueue(skb, report, &net->nft.notify_list);
6353         return;
6354 err:
6355         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6356 }
6357 EXPORT_SYMBOL_GPL(nft_obj_notify);
6358
6359 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6360                                  struct nft_object *obj, int event)
6361 {
6362         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6363                        ctx->family, ctx->report, GFP_KERNEL);
6364 }
6365
6366 /*
6367  * Flow tables
6368  */
6369 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6370 {
6371         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6372         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6373         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6374 }
6375 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6376
6377 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6378 {
6379         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6380         list_del_rcu(&type->list);
6381         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6382 }
6383 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6384
6385 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6386         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6387                                             .len = NFT_NAME_MAXLEN - 1 },
6388         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6389                                             .len = NFT_NAME_MAXLEN - 1 },
6390         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6391         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6392         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6393 };
6394
6395 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6396                                            const struct nlattr *nla, u8 genmask)
6397 {
6398         struct nft_flowtable *flowtable;
6399
6400         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6401                 if (!nla_strcmp(nla, flowtable->name) &&
6402                     nft_active_genmask(flowtable, genmask))
6403                         return flowtable;
6404         }
6405         return ERR_PTR(-ENOENT);
6406 }
6407 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6408
6409 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6410                                     struct nft_flowtable *flowtable,
6411                                     enum nft_trans_phase phase)
6412 {
6413         switch (phase) {
6414         case NFT_TRANS_PREPARE:
6415         case NFT_TRANS_ABORT:
6416         case NFT_TRANS_RELEASE:
6417                 flowtable->use--;
6418                 fallthrough;
6419         default:
6420                 return;
6421         }
6422 }
6423 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6424
6425 static struct nft_flowtable *
6426 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6427                               const struct nlattr *nla, u8 genmask)
6428 {
6429        struct nft_flowtable *flowtable;
6430
6431        list_for_each_entry(flowtable, &table->flowtables, list) {
6432                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6433                    nft_active_genmask(flowtable, genmask))
6434                        return flowtable;
6435        }
6436        return ERR_PTR(-ENOENT);
6437 }
6438
6439 struct nft_flowtable_hook {
6440         u32                     num;
6441         int                     priority;
6442         struct list_head        list;
6443 };
6444
6445 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6446         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6447         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6448         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6449 };
6450
6451 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6452                                     const struct nlattr *attr,
6453                                     struct nft_flowtable_hook *flowtable_hook,
6454                                     struct nft_flowtable *flowtable, bool add)
6455 {
6456         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6457         struct nft_hook *hook;
6458         int hooknum, priority;
6459         int err;
6460
6461         INIT_LIST_HEAD(&flowtable_hook->list);
6462
6463         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6464                                           nft_flowtable_hook_policy, NULL);
6465         if (err < 0)
6466                 return err;
6467
6468         if (add) {
6469                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6470                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6471                         return -EINVAL;
6472
6473                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6474                 if (hooknum != NF_NETDEV_INGRESS)
6475                         return -EOPNOTSUPP;
6476
6477                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6478
6479                 flowtable_hook->priority        = priority;
6480                 flowtable_hook->num             = hooknum;
6481         } else {
6482                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6483                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6484                         if (hooknum != flowtable->hooknum)
6485                                 return -EOPNOTSUPP;
6486                 }
6487
6488                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6489                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6490                         if (priority != flowtable->data.priority)
6491                                 return -EOPNOTSUPP;
6492                 }
6493
6494                 flowtable_hook->priority        = flowtable->data.priority;
6495                 flowtable_hook->num             = flowtable->hooknum;
6496         }
6497
6498         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6499                 err = nf_tables_parse_netdev_hooks(ctx->net,
6500                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6501                                                    &flowtable_hook->list);
6502                 if (err < 0)
6503                         return err;
6504         }
6505
6506         list_for_each_entry(hook, &flowtable_hook->list, list) {
6507                 hook->ops.pf            = NFPROTO_NETDEV;
6508                 hook->ops.hooknum       = flowtable_hook->num;
6509                 hook->ops.priority      = flowtable_hook->priority;
6510                 hook->ops.priv          = &flowtable->data;
6511                 hook->ops.hook          = flowtable->data.type->hook;
6512         }
6513
6514         return err;
6515 }
6516
6517 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6518 {
6519         const struct nf_flowtable_type *type;
6520
6521         list_for_each_entry(type, &nf_tables_flowtables, list) {
6522                 if (family == type->family)
6523                         return type;
6524         }
6525         return NULL;
6526 }
6527
6528 static const struct nf_flowtable_type *
6529 nft_flowtable_type_get(struct net *net, u8 family)
6530 {
6531         const struct nf_flowtable_type *type;
6532
6533         type = __nft_flowtable_type_get(family);
6534         if (type != NULL && try_module_get(type->owner))
6535                 return type;
6536
6537         lockdep_nfnl_nft_mutex_not_held();
6538 #ifdef CONFIG_MODULES
6539         if (type == NULL) {
6540                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6541                         return ERR_PTR(-EAGAIN);
6542         }
6543 #endif
6544         return ERR_PTR(-ENOENT);
6545 }
6546
6547 /* Only called from error and netdev event paths. */
6548 static void nft_unregister_flowtable_hook(struct net *net,
6549                                           struct nft_flowtable *flowtable,
6550                                           struct nft_hook *hook)
6551 {
6552         nf_unregister_net_hook(net, &hook->ops);
6553         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6554                                     FLOW_BLOCK_UNBIND);
6555 }
6556
6557 static void nft_unregister_flowtable_net_hooks(struct net *net,
6558                                                struct list_head *hook_list)
6559 {
6560         struct nft_hook *hook;
6561
6562         list_for_each_entry(hook, hook_list, list)
6563                 nf_unregister_net_hook(net, &hook->ops);
6564 }
6565
6566 static int nft_register_flowtable_net_hooks(struct net *net,
6567                                             struct nft_table *table,
6568                                             struct list_head *hook_list,
6569                                             struct nft_flowtable *flowtable)
6570 {
6571         struct nft_hook *hook, *hook2, *next;
6572         struct nft_flowtable *ft;
6573         int err, i = 0;
6574
6575         list_for_each_entry(hook, hook_list, list) {
6576                 list_for_each_entry(ft, &table->flowtables, list) {
6577                         list_for_each_entry(hook2, &ft->hook_list, list) {
6578                                 if (hook->ops.dev == hook2->ops.dev &&
6579                                     hook->ops.pf == hook2->ops.pf) {
6580                                         err = -EEXIST;
6581                                         goto err_unregister_net_hooks;
6582                                 }
6583                         }
6584                 }
6585
6586                 err = flowtable->data.type->setup(&flowtable->data,
6587                                                   hook->ops.dev,
6588                                                   FLOW_BLOCK_BIND);
6589                 if (err < 0)
6590                         goto err_unregister_net_hooks;
6591
6592                 err = nf_register_net_hook(net, &hook->ops);
6593                 if (err < 0) {
6594                         flowtable->data.type->setup(&flowtable->data,
6595                                                     hook->ops.dev,
6596                                                     FLOW_BLOCK_UNBIND);
6597                         goto err_unregister_net_hooks;
6598                 }
6599
6600                 i++;
6601         }
6602
6603         return 0;
6604
6605 err_unregister_net_hooks:
6606         list_for_each_entry_safe(hook, next, hook_list, list) {
6607                 if (i-- <= 0)
6608                         break;
6609
6610                 nft_unregister_flowtable_hook(net, flowtable, hook);
6611                 list_del_rcu(&hook->list);
6612                 kfree_rcu(hook, rcu);
6613         }
6614
6615         return err;
6616 }
6617
6618 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6619 {
6620         struct nft_hook *hook, *next;
6621
6622         list_for_each_entry_safe(hook, next, hook_list, list) {
6623                 list_del_rcu(&hook->list);
6624                 kfree_rcu(hook, rcu);
6625         }
6626 }
6627
6628 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6629                                 struct nft_flowtable *flowtable)
6630 {
6631         const struct nlattr * const *nla = ctx->nla;
6632         struct nft_flowtable_hook flowtable_hook;
6633         struct nft_hook *hook, *next;
6634         struct nft_trans *trans;
6635         bool unregister = false;
6636         int err;
6637
6638         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6639                                        &flowtable_hook, flowtable, false);
6640         if (err < 0)
6641                 return err;
6642
6643         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6644                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6645                         list_del(&hook->list);
6646                         kfree(hook);
6647                 }
6648         }
6649
6650         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6651                                                &flowtable_hook.list, flowtable);
6652         if (err < 0)
6653                 goto err_flowtable_update_hook;
6654
6655         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6656                                 sizeof(struct nft_trans_flowtable));
6657         if (!trans) {
6658                 unregister = true;
6659                 err = -ENOMEM;
6660                 goto err_flowtable_update_hook;
6661         }
6662
6663         nft_trans_flowtable(trans) = flowtable;
6664         nft_trans_flowtable_update(trans) = true;
6665         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6666         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6667
6668         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6669
6670         return 0;
6671
6672 err_flowtable_update_hook:
6673         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6674                 if (unregister)
6675                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6676                 list_del_rcu(&hook->list);
6677                 kfree_rcu(hook, rcu);
6678         }
6679
6680         return err;
6681
6682 }
6683
6684 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6685                                   struct sk_buff *skb,
6686                                   const struct nlmsghdr *nlh,
6687                                   const struct nlattr * const nla[],
6688                                   struct netlink_ext_ack *extack)
6689 {
6690         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6691         struct nft_flowtable_hook flowtable_hook;
6692         const struct nf_flowtable_type *type;
6693         u8 genmask = nft_genmask_next(net);
6694         int family = nfmsg->nfgen_family;
6695         struct nft_flowtable *flowtable;
6696         struct nft_hook *hook, *next;
6697         struct nft_table *table;
6698         struct nft_ctx ctx;
6699         int err;
6700
6701         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6702             !nla[NFTA_FLOWTABLE_NAME] ||
6703             !nla[NFTA_FLOWTABLE_HOOK])
6704                 return -EINVAL;
6705
6706         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6707                                  genmask);
6708         if (IS_ERR(table)) {
6709                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6710                 return PTR_ERR(table);
6711         }
6712
6713         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6714                                          genmask);
6715         if (IS_ERR(flowtable)) {
6716                 err = PTR_ERR(flowtable);
6717                 if (err != -ENOENT) {
6718                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6719                         return err;
6720                 }
6721         } else {
6722                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6723                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6724                         return -EEXIST;
6725                 }
6726
6727                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6728
6729                 return nft_flowtable_update(&ctx, nlh, flowtable);
6730         }
6731
6732         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6733
6734         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6735         if (!flowtable)
6736                 return -ENOMEM;
6737
6738         flowtable->table = table;
6739         flowtable->handle = nf_tables_alloc_handle(table);
6740         INIT_LIST_HEAD(&flowtable->hook_list);
6741
6742         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6743         if (!flowtable->name) {
6744                 err = -ENOMEM;
6745                 goto err1;
6746         }
6747
6748         type = nft_flowtable_type_get(net, family);
6749         if (IS_ERR(type)) {
6750                 err = PTR_ERR(type);
6751                 goto err2;
6752         }
6753
6754         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6755                 flowtable->data.flags =
6756                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6757                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6758                         goto err3;
6759         }
6760
6761         write_pnet(&flowtable->data.net, net);
6762         flowtable->data.type = type;
6763         err = type->init(&flowtable->data);
6764         if (err < 0)
6765                 goto err3;
6766
6767         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6768                                        &flowtable_hook, flowtable, true);
6769         if (err < 0)
6770                 goto err4;
6771
6772         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6773         flowtable->data.priority = flowtable_hook.priority;
6774         flowtable->hooknum = flowtable_hook.num;
6775
6776         err = nft_register_flowtable_net_hooks(ctx.net, table,
6777                                                &flowtable->hook_list,
6778                                                flowtable);
6779         if (err < 0) {
6780                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6781                 goto err4;
6782         }
6783
6784         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6785         if (err < 0)
6786                 goto err5;
6787
6788         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6789         table->use++;
6790
6791         return 0;
6792 err5:
6793         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6794                 nft_unregister_flowtable_hook(net, flowtable, hook);
6795                 list_del_rcu(&hook->list);
6796                 kfree_rcu(hook, rcu);
6797         }
6798 err4:
6799         flowtable->data.type->free(&flowtable->data);
6800 err3:
6801         module_put(type->owner);
6802 err2:
6803         kfree(flowtable->name);
6804 err1:
6805         kfree(flowtable);
6806         return err;
6807 }
6808
6809 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6810 {
6811         struct nft_hook *this, *next;
6812
6813         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6814                 list_del(&this->list);
6815                 kfree(this);
6816         }
6817 }
6818
6819 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6820                                  struct nft_flowtable *flowtable)
6821 {
6822         const struct nlattr * const *nla = ctx->nla;
6823         struct nft_flowtable_hook flowtable_hook;
6824         struct nft_hook *this, *hook;
6825         struct nft_trans *trans;
6826         int err;
6827
6828         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6829                                        &flowtable_hook, flowtable, false);
6830         if (err < 0)
6831                 return err;
6832
6833         list_for_each_entry(this, &flowtable_hook.list, list) {
6834                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6835                 if (!hook) {
6836                         err = -ENOENT;
6837                         goto err_flowtable_del_hook;
6838                 }
6839                 hook->inactive = true;
6840         }
6841
6842         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
6843                                 sizeof(struct nft_trans_flowtable));
6844         if (!trans) {
6845                 err = -ENOMEM;
6846                 goto err_flowtable_del_hook;
6847         }
6848
6849         nft_trans_flowtable(trans) = flowtable;
6850         nft_trans_flowtable_update(trans) = true;
6851         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6852         nft_flowtable_hook_release(&flowtable_hook);
6853
6854         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6855
6856         return 0;
6857
6858 err_flowtable_del_hook:
6859         list_for_each_entry(this, &flowtable_hook.list, list) {
6860                 hook = nft_hook_list_find(&flowtable->hook_list, this);
6861                 if (!hook)
6862                         break;
6863
6864                 hook->inactive = false;
6865         }
6866         nft_flowtable_hook_release(&flowtable_hook);
6867
6868         return err;
6869 }
6870
6871 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6872                                   struct sk_buff *skb,
6873                                   const struct nlmsghdr *nlh,
6874                                   const struct nlattr * const nla[],
6875                                   struct netlink_ext_ack *extack)
6876 {
6877         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6878         u8 genmask = nft_genmask_next(net);
6879         int family = nfmsg->nfgen_family;
6880         struct nft_flowtable *flowtable;
6881         const struct nlattr *attr;
6882         struct nft_table *table;
6883         struct nft_ctx ctx;
6884
6885         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6886             (!nla[NFTA_FLOWTABLE_NAME] &&
6887              !nla[NFTA_FLOWTABLE_HANDLE]))
6888                 return -EINVAL;
6889
6890         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6891                                  genmask);
6892         if (IS_ERR(table)) {
6893                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6894                 return PTR_ERR(table);
6895         }
6896
6897         if (nla[NFTA_FLOWTABLE_HANDLE]) {
6898                 attr = nla[NFTA_FLOWTABLE_HANDLE];
6899                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6900         } else {
6901                 attr = nla[NFTA_FLOWTABLE_NAME];
6902                 flowtable = nft_flowtable_lookup(table, attr, genmask);
6903         }
6904
6905         if (IS_ERR(flowtable)) {
6906                 NL_SET_BAD_ATTR(extack, attr);
6907                 return PTR_ERR(flowtable);
6908         }
6909
6910         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6911
6912         if (nla[NFTA_FLOWTABLE_HOOK])
6913                 return nft_delflowtable_hook(&ctx, flowtable);
6914
6915         if (flowtable->use > 0) {
6916                 NL_SET_BAD_ATTR(extack, attr);
6917                 return -EBUSY;
6918         }
6919
6920         return nft_delflowtable(&ctx, flowtable);
6921 }
6922
6923 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6924                                          u32 portid, u32 seq, int event,
6925                                          u32 flags, int family,
6926                                          struct nft_flowtable *flowtable,
6927                                          struct list_head *hook_list)
6928 {
6929         struct nlattr *nest, *nest_devs;
6930         struct nfgenmsg *nfmsg;
6931         struct nft_hook *hook;
6932         struct nlmsghdr *nlh;
6933
6934         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6935         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6936         if (nlh == NULL)
6937                 goto nla_put_failure;
6938
6939         nfmsg = nlmsg_data(nlh);
6940         nfmsg->nfgen_family     = family;
6941         nfmsg->version          = NFNETLINK_V0;
6942         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6943
6944         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6945             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6946             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6947             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6948                          NFTA_FLOWTABLE_PAD) ||
6949             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6950                 goto nla_put_failure;
6951
6952         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6953         if (!nest)
6954                 goto nla_put_failure;
6955         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6956             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6957                 goto nla_put_failure;
6958
6959         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6960         if (!nest_devs)
6961                 goto nla_put_failure;
6962
6963         list_for_each_entry_rcu(hook, hook_list, list) {
6964                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6965                         goto nla_put_failure;
6966         }
6967         nla_nest_end(skb, nest_devs);
6968         nla_nest_end(skb, nest);
6969
6970         nlmsg_end(skb, nlh);
6971         return 0;
6972
6973 nla_put_failure:
6974         nlmsg_trim(skb, nlh);
6975         return -1;
6976 }
6977
6978 struct nft_flowtable_filter {
6979         char            *table;
6980 };
6981
6982 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6983                                     struct netlink_callback *cb)
6984 {
6985         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6986         struct nft_flowtable_filter *filter = cb->data;
6987         unsigned int idx = 0, s_idx = cb->args[0];
6988         struct net *net = sock_net(skb->sk);
6989         int family = nfmsg->nfgen_family;
6990         struct nft_flowtable *flowtable;
6991         const struct nft_table *table;
6992
6993         rcu_read_lock();
6994         cb->seq = net->nft.base_seq;
6995
6996         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6997                 if (family != NFPROTO_UNSPEC && family != table->family)
6998                         continue;
6999
7000                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7001                         if (!nft_is_active(net, flowtable))
7002                                 goto cont;
7003                         if (idx < s_idx)
7004                                 goto cont;
7005                         if (idx > s_idx)
7006                                 memset(&cb->args[1], 0,
7007                                        sizeof(cb->args) - sizeof(cb->args[0]));
7008                         if (filter && filter->table &&
7009                             strcmp(filter->table, table->name))
7010                                 goto cont;
7011
7012                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7013                                                           cb->nlh->nlmsg_seq,
7014                                                           NFT_MSG_NEWFLOWTABLE,
7015                                                           NLM_F_MULTI | NLM_F_APPEND,
7016                                                           table->family,
7017                                                           flowtable,
7018                                                           &flowtable->hook_list) < 0)
7019                                 goto done;
7020
7021                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7022 cont:
7023                         idx++;
7024                 }
7025         }
7026 done:
7027         rcu_read_unlock();
7028
7029         cb->args[0] = idx;
7030         return skb->len;
7031 }
7032
7033 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7034 {
7035         const struct nlattr * const *nla = cb->data;
7036         struct nft_flowtable_filter *filter = NULL;
7037
7038         if (nla[NFTA_FLOWTABLE_TABLE]) {
7039                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7040                 if (!filter)
7041                         return -ENOMEM;
7042
7043                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7044                                            GFP_ATOMIC);
7045                 if (!filter->table) {
7046                         kfree(filter);
7047                         return -ENOMEM;
7048                 }
7049         }
7050
7051         cb->data = filter;
7052         return 0;
7053 }
7054
7055 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7056 {
7057         struct nft_flowtable_filter *filter = cb->data;
7058
7059         if (!filter)
7060                 return 0;
7061
7062         kfree(filter->table);
7063         kfree(filter);
7064
7065         return 0;
7066 }
7067
7068 /* called with rcu_read_lock held */
7069 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7070                                   struct sk_buff *skb,
7071                                   const struct nlmsghdr *nlh,
7072                                   const struct nlattr * const nla[],
7073                                   struct netlink_ext_ack *extack)
7074 {
7075         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7076         u8 genmask = nft_genmask_cur(net);
7077         int family = nfmsg->nfgen_family;
7078         struct nft_flowtable *flowtable;
7079         const struct nft_table *table;
7080         struct sk_buff *skb2;
7081         int err;
7082
7083         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7084                 struct netlink_dump_control c = {
7085                         .start = nf_tables_dump_flowtable_start,
7086                         .dump = nf_tables_dump_flowtable,
7087                         .done = nf_tables_dump_flowtable_done,
7088                         .module = THIS_MODULE,
7089                         .data = (void *)nla,
7090                 };
7091
7092                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7093         }
7094
7095         if (!nla[NFTA_FLOWTABLE_NAME])
7096                 return -EINVAL;
7097
7098         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7099                                  genmask);
7100         if (IS_ERR(table))
7101                 return PTR_ERR(table);
7102
7103         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7104                                          genmask);
7105         if (IS_ERR(flowtable))
7106                 return PTR_ERR(flowtable);
7107
7108         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7109         if (!skb2)
7110                 return -ENOMEM;
7111
7112         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7113                                             nlh->nlmsg_seq,
7114                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7115                                             flowtable, &flowtable->hook_list);
7116         if (err < 0)
7117                 goto err_fill_flowtable_info;
7118
7119         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7120
7121 err_fill_flowtable_info:
7122         kfree_skb(skb2);
7123         return err;
7124 }
7125
7126 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7127                                        struct nft_flowtable *flowtable,
7128                                        struct list_head *hook_list,
7129                                        int event)
7130 {
7131         struct sk_buff *skb;
7132         int err;
7133         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7134                               flowtable->table->name, flowtable->table->handle,
7135                               flowtable->name, flowtable->handle);
7136
7137         audit_log_nfcfg(buf,
7138                         ctx->family,
7139                         flowtable->hooknum,
7140                         event == NFT_MSG_NEWFLOWTABLE ?
7141                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7142                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7143                         GFP_KERNEL);
7144         kfree(buf);
7145
7146         if (!ctx->report &&
7147             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7148                 return;
7149
7150         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7151         if (skb == NULL)
7152                 goto err;
7153
7154         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7155                                             ctx->seq, event, 0,
7156                                             ctx->family, flowtable, hook_list);
7157         if (err < 0) {
7158                 kfree_skb(skb);
7159                 goto err;
7160         }
7161
7162         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7163         return;
7164 err:
7165         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7166 }
7167
7168 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7169 {
7170         struct nft_hook *hook, *next;
7171
7172         flowtable->data.type->free(&flowtable->data);
7173         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7174                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7175                                             FLOW_BLOCK_UNBIND);
7176                 list_del_rcu(&hook->list);
7177                 kfree(hook);
7178         }
7179         kfree(flowtable->name);
7180         module_put(flowtable->data.type->owner);
7181         kfree(flowtable);
7182 }
7183
7184 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7185                                    u32 portid, u32 seq)
7186 {
7187         struct nlmsghdr *nlh;
7188         struct nfgenmsg *nfmsg;
7189         char buf[TASK_COMM_LEN];
7190         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7191
7192         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7193         if (nlh == NULL)
7194                 goto nla_put_failure;
7195
7196         nfmsg = nlmsg_data(nlh);
7197         nfmsg->nfgen_family     = AF_UNSPEC;
7198         nfmsg->version          = NFNETLINK_V0;
7199         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7200
7201         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7202             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7203             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7204                 goto nla_put_failure;
7205
7206         nlmsg_end(skb, nlh);
7207         return 0;
7208
7209 nla_put_failure:
7210         nlmsg_trim(skb, nlh);
7211         return -EMSGSIZE;
7212 }
7213
7214 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7215                                 struct nft_flowtable *flowtable)
7216 {
7217         struct nft_hook *hook;
7218
7219         list_for_each_entry(hook, &flowtable->hook_list, list) {
7220                 if (hook->ops.dev != dev)
7221                         continue;
7222
7223                 /* flow_offload_netdev_event() cleans up entries for us. */
7224                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7225                 list_del_rcu(&hook->list);
7226                 kfree_rcu(hook, rcu);
7227                 break;
7228         }
7229 }
7230
7231 static int nf_tables_flowtable_event(struct notifier_block *this,
7232                                      unsigned long event, void *ptr)
7233 {
7234         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7235         struct nft_flowtable *flowtable;
7236         struct nft_table *table;
7237         struct net *net;
7238
7239         if (event != NETDEV_UNREGISTER)
7240                 return 0;
7241
7242         net = dev_net(dev);
7243         mutex_lock(&net->nft.commit_mutex);
7244         list_for_each_entry(table, &net->nft.tables, list) {
7245                 list_for_each_entry(flowtable, &table->flowtables, list) {
7246                         nft_flowtable_event(event, dev, flowtable);
7247                 }
7248         }
7249         mutex_unlock(&net->nft.commit_mutex);
7250
7251         return NOTIFY_DONE;
7252 }
7253
7254 static struct notifier_block nf_tables_flowtable_notifier = {
7255         .notifier_call  = nf_tables_flowtable_event,
7256 };
7257
7258 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7259                                  int event)
7260 {
7261         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7262         struct sk_buff *skb2;
7263         int err;
7264
7265         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7266                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7267
7268         if (!nlmsg_report(nlh) &&
7269             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7270                 return;
7271
7272         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7273         if (skb2 == NULL)
7274                 goto err;
7275
7276         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7277                                       nlh->nlmsg_seq);
7278         if (err < 0) {
7279                 kfree_skb(skb2);
7280                 goto err;
7281         }
7282
7283         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7284                        nlmsg_report(nlh), GFP_KERNEL);
7285         return;
7286 err:
7287         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7288                           -ENOBUFS);
7289 }
7290
7291 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7292                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7293                             const struct nlattr * const nla[],
7294                             struct netlink_ext_ack *extack)
7295 {
7296         struct sk_buff *skb2;
7297         int err;
7298
7299         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7300         if (skb2 == NULL)
7301                 return -ENOMEM;
7302
7303         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7304                                       nlh->nlmsg_seq);
7305         if (err < 0)
7306                 goto err_fill_gen_info;
7307
7308         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7309
7310 err_fill_gen_info:
7311         kfree_skb(skb2);
7312         return err;
7313 }
7314
7315 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7316         [NFT_MSG_NEWTABLE] = {
7317                 .call_batch     = nf_tables_newtable,
7318                 .attr_count     = NFTA_TABLE_MAX,
7319                 .policy         = nft_table_policy,
7320         },
7321         [NFT_MSG_GETTABLE] = {
7322                 .call_rcu       = nf_tables_gettable,
7323                 .attr_count     = NFTA_TABLE_MAX,
7324                 .policy         = nft_table_policy,
7325         },
7326         [NFT_MSG_DELTABLE] = {
7327                 .call_batch     = nf_tables_deltable,
7328                 .attr_count     = NFTA_TABLE_MAX,
7329                 .policy         = nft_table_policy,
7330         },
7331         [NFT_MSG_NEWCHAIN] = {
7332                 .call_batch     = nf_tables_newchain,
7333                 .attr_count     = NFTA_CHAIN_MAX,
7334                 .policy         = nft_chain_policy,
7335         },
7336         [NFT_MSG_GETCHAIN] = {
7337                 .call_rcu       = nf_tables_getchain,
7338                 .attr_count     = NFTA_CHAIN_MAX,
7339                 .policy         = nft_chain_policy,
7340         },
7341         [NFT_MSG_DELCHAIN] = {
7342                 .call_batch     = nf_tables_delchain,
7343                 .attr_count     = NFTA_CHAIN_MAX,
7344                 .policy         = nft_chain_policy,
7345         },
7346         [NFT_MSG_NEWRULE] = {
7347                 .call_batch     = nf_tables_newrule,
7348                 .attr_count     = NFTA_RULE_MAX,
7349                 .policy         = nft_rule_policy,
7350         },
7351         [NFT_MSG_GETRULE] = {
7352                 .call_rcu       = nf_tables_getrule,
7353                 .attr_count     = NFTA_RULE_MAX,
7354                 .policy         = nft_rule_policy,
7355         },
7356         [NFT_MSG_DELRULE] = {
7357                 .call_batch     = nf_tables_delrule,
7358                 .attr_count     = NFTA_RULE_MAX,
7359                 .policy         = nft_rule_policy,
7360         },
7361         [NFT_MSG_NEWSET] = {
7362                 .call_batch     = nf_tables_newset,
7363                 .attr_count     = NFTA_SET_MAX,
7364                 .policy         = nft_set_policy,
7365         },
7366         [NFT_MSG_GETSET] = {
7367                 .call_rcu       = nf_tables_getset,
7368                 .attr_count     = NFTA_SET_MAX,
7369                 .policy         = nft_set_policy,
7370         },
7371         [NFT_MSG_DELSET] = {
7372                 .call_batch     = nf_tables_delset,
7373                 .attr_count     = NFTA_SET_MAX,
7374                 .policy         = nft_set_policy,
7375         },
7376         [NFT_MSG_NEWSETELEM] = {
7377                 .call_batch     = nf_tables_newsetelem,
7378                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7379                 .policy         = nft_set_elem_list_policy,
7380         },
7381         [NFT_MSG_GETSETELEM] = {
7382                 .call_rcu       = nf_tables_getsetelem,
7383                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7384                 .policy         = nft_set_elem_list_policy,
7385         },
7386         [NFT_MSG_DELSETELEM] = {
7387                 .call_batch     = nf_tables_delsetelem,
7388                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7389                 .policy         = nft_set_elem_list_policy,
7390         },
7391         [NFT_MSG_GETGEN] = {
7392                 .call_rcu       = nf_tables_getgen,
7393         },
7394         [NFT_MSG_NEWOBJ] = {
7395                 .call_batch     = nf_tables_newobj,
7396                 .attr_count     = NFTA_OBJ_MAX,
7397                 .policy         = nft_obj_policy,
7398         },
7399         [NFT_MSG_GETOBJ] = {
7400                 .call_rcu       = nf_tables_getobj,
7401                 .attr_count     = NFTA_OBJ_MAX,
7402                 .policy         = nft_obj_policy,
7403         },
7404         [NFT_MSG_DELOBJ] = {
7405                 .call_batch     = nf_tables_delobj,
7406                 .attr_count     = NFTA_OBJ_MAX,
7407                 .policy         = nft_obj_policy,
7408         },
7409         [NFT_MSG_GETOBJ_RESET] = {
7410                 .call_rcu       = nf_tables_getobj,
7411                 .attr_count     = NFTA_OBJ_MAX,
7412                 .policy         = nft_obj_policy,
7413         },
7414         [NFT_MSG_NEWFLOWTABLE] = {
7415                 .call_batch     = nf_tables_newflowtable,
7416                 .attr_count     = NFTA_FLOWTABLE_MAX,
7417                 .policy         = nft_flowtable_policy,
7418         },
7419         [NFT_MSG_GETFLOWTABLE] = {
7420                 .call_rcu       = nf_tables_getflowtable,
7421                 .attr_count     = NFTA_FLOWTABLE_MAX,
7422                 .policy         = nft_flowtable_policy,
7423         },
7424         [NFT_MSG_DELFLOWTABLE] = {
7425                 .call_batch     = nf_tables_delflowtable,
7426                 .attr_count     = NFTA_FLOWTABLE_MAX,
7427                 .policy         = nft_flowtable_policy,
7428         },
7429 };
7430
7431 static int nf_tables_validate(struct net *net)
7432 {
7433         struct nft_table *table;
7434
7435         switch (net->nft.validate_state) {
7436         case NFT_VALIDATE_SKIP:
7437                 break;
7438         case NFT_VALIDATE_NEED:
7439                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7440                 fallthrough;
7441         case NFT_VALIDATE_DO:
7442                 list_for_each_entry(table, &net->nft.tables, list) {
7443                         if (nft_table_validate(net, table) < 0)
7444                                 return -EAGAIN;
7445                 }
7446                 break;
7447         }
7448
7449         return 0;
7450 }
7451
7452 /* a drop policy has to be deferred until all rules have been activated,
7453  * otherwise a large ruleset that contains a drop-policy base chain will
7454  * cause all packets to get dropped until the full transaction has been
7455  * processed.
7456  *
7457  * We defer the drop policy until the transaction has been finalized.
7458  */
7459 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7460 {
7461         struct nft_base_chain *basechain;
7462
7463         if (nft_trans_chain_policy(trans) != NF_DROP)
7464                 return;
7465
7466         if (!nft_is_base_chain(trans->ctx.chain))
7467                 return;
7468
7469         basechain = nft_base_chain(trans->ctx.chain);
7470         basechain->policy = NF_DROP;
7471 }
7472
7473 static void nft_chain_commit_update(struct nft_trans *trans)
7474 {
7475         struct nft_base_chain *basechain;
7476
7477         if (nft_trans_chain_name(trans)) {
7478                 rhltable_remove(&trans->ctx.table->chains_ht,
7479                                 &trans->ctx.chain->rhlhead,
7480                                 nft_chain_ht_params);
7481                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7482                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7483                                     trans->ctx.chain->name,
7484                                     &trans->ctx.chain->rhlhead,
7485                                     nft_chain_ht_params);
7486         }
7487
7488         if (!nft_is_base_chain(trans->ctx.chain))
7489                 return;
7490
7491         nft_chain_stats_replace(trans);
7492
7493         basechain = nft_base_chain(trans->ctx.chain);
7494
7495         switch (nft_trans_chain_policy(trans)) {
7496         case NF_DROP:
7497         case NF_ACCEPT:
7498                 basechain->policy = nft_trans_chain_policy(trans);
7499                 break;
7500         }
7501 }
7502
7503 static void nft_obj_commit_update(struct nft_trans *trans)
7504 {
7505         struct nft_object *newobj;
7506         struct nft_object *obj;
7507
7508         obj = nft_trans_obj(trans);
7509         newobj = nft_trans_obj_newobj(trans);
7510
7511         if (obj->ops->update)
7512                 obj->ops->update(obj, newobj);
7513
7514         kfree(newobj);
7515 }
7516
7517 static void nft_commit_release(struct nft_trans *trans)
7518 {
7519         switch (trans->msg_type) {
7520         case NFT_MSG_DELTABLE:
7521                 nf_tables_table_destroy(&trans->ctx);
7522                 break;
7523         case NFT_MSG_NEWCHAIN:
7524                 free_percpu(nft_trans_chain_stats(trans));
7525                 kfree(nft_trans_chain_name(trans));
7526                 break;
7527         case NFT_MSG_DELCHAIN:
7528                 nf_tables_chain_destroy(&trans->ctx);
7529                 break;
7530         case NFT_MSG_DELRULE:
7531                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7532                 break;
7533         case NFT_MSG_DELSET:
7534                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7535                 break;
7536         case NFT_MSG_DELSETELEM:
7537                 nf_tables_set_elem_destroy(&trans->ctx,
7538                                            nft_trans_elem_set(trans),
7539                                            nft_trans_elem(trans).priv);
7540                 break;
7541         case NFT_MSG_DELOBJ:
7542                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7543                 break;
7544         case NFT_MSG_DELFLOWTABLE:
7545                 if (nft_trans_flowtable_update(trans))
7546                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7547                 else
7548                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7549                 break;
7550         }
7551
7552         if (trans->put_net)
7553                 put_net(trans->ctx.net);
7554
7555         kfree(trans);
7556 }
7557
7558 static void nf_tables_trans_destroy_work(struct work_struct *w)
7559 {
7560         struct nft_trans *trans, *next;
7561         LIST_HEAD(head);
7562
7563         spin_lock(&nf_tables_destroy_list_lock);
7564         list_splice_init(&nf_tables_destroy_list, &head);
7565         spin_unlock(&nf_tables_destroy_list_lock);
7566
7567         if (list_empty(&head))
7568                 return;
7569
7570         synchronize_rcu();
7571
7572         list_for_each_entry_safe(trans, next, &head, list) {
7573                 list_del(&trans->list);
7574                 nft_commit_release(trans);
7575         }
7576 }
7577
7578 void nf_tables_trans_destroy_flush_work(void)
7579 {
7580         flush_work(&trans_destroy_work);
7581 }
7582 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7583
7584 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7585 {
7586         struct nft_rule *rule;
7587         unsigned int alloc = 0;
7588         int i;
7589
7590         /* already handled or inactive chain? */
7591         if (chain->rules_next || !nft_is_active_next(net, chain))
7592                 return 0;
7593
7594         rule = list_entry(&chain->rules, struct nft_rule, list);
7595         i = 0;
7596
7597         list_for_each_entry_continue(rule, &chain->rules, list) {
7598                 if (nft_is_active_next(net, rule))
7599                         alloc++;
7600         }
7601
7602         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7603         if (!chain->rules_next)
7604                 return -ENOMEM;
7605
7606         list_for_each_entry_continue(rule, &chain->rules, list) {
7607                 if (nft_is_active_next(net, rule))
7608                         chain->rules_next[i++] = rule;
7609         }
7610
7611         chain->rules_next[i] = NULL;
7612         return 0;
7613 }
7614
7615 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7616 {
7617         struct nft_trans *trans, *next;
7618
7619         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7620                 struct nft_chain *chain = trans->ctx.chain;
7621
7622                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7623                     trans->msg_type == NFT_MSG_DELRULE) {
7624                         kvfree(chain->rules_next);
7625                         chain->rules_next = NULL;
7626                 }
7627         }
7628 }
7629
7630 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7631 {
7632         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7633
7634         kvfree(o->start);
7635 }
7636
7637 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7638 {
7639         struct nft_rule **r = rules;
7640         struct nft_rules_old *old;
7641
7642         while (*r)
7643                 r++;
7644
7645         r++;    /* rcu_head is after end marker */
7646         old = (void *) r;
7647         old->start = rules;
7648
7649         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7650 }
7651
7652 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7653 {
7654         struct nft_rule **g0, **g1;
7655         bool next_genbit;
7656
7657         next_genbit = nft_gencursor_next(net);
7658
7659         g0 = rcu_dereference_protected(chain->rules_gen_0,
7660                                        lockdep_commit_lock_is_held(net));
7661         g1 = rcu_dereference_protected(chain->rules_gen_1,
7662                                        lockdep_commit_lock_is_held(net));
7663
7664         /* No changes to this chain? */
7665         if (chain->rules_next == NULL) {
7666                 /* chain had no change in last or next generation */
7667                 if (g0 == g1)
7668                         return;
7669                 /*
7670                  * chain had no change in this generation; make sure next
7671                  * one uses same rules as current generation.
7672                  */
7673                 if (next_genbit) {
7674                         rcu_assign_pointer(chain->rules_gen_1, g0);
7675                         nf_tables_commit_chain_free_rules_old(g1);
7676                 } else {
7677                         rcu_assign_pointer(chain->rules_gen_0, g1);
7678                         nf_tables_commit_chain_free_rules_old(g0);
7679                 }
7680
7681                 return;
7682         }
7683
7684         if (next_genbit)
7685                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7686         else
7687                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7688
7689         chain->rules_next = NULL;
7690
7691         if (g0 == g1)
7692                 return;
7693
7694         if (next_genbit)
7695                 nf_tables_commit_chain_free_rules_old(g1);
7696         else
7697                 nf_tables_commit_chain_free_rules_old(g0);
7698 }
7699
7700 static void nft_obj_del(struct nft_object *obj)
7701 {
7702         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7703         list_del_rcu(&obj->list);
7704 }
7705
7706 void nft_chain_del(struct nft_chain *chain)
7707 {
7708         struct nft_table *table = chain->table;
7709
7710         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7711                                      nft_chain_ht_params));
7712         list_del_rcu(&chain->list);
7713 }
7714
7715 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7716                                     struct list_head *hook_list)
7717 {
7718         struct nft_hook *hook, *next;
7719
7720         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7721                 if (hook->inactive)
7722                         list_move(&hook->list, hook_list);
7723         }
7724 }
7725
7726 static void nf_tables_module_autoload_cleanup(struct net *net)
7727 {
7728         struct nft_module_request *req, *next;
7729
7730         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7731         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7732                 WARN_ON_ONCE(!req->done);
7733                 list_del(&req->list);
7734                 kfree(req);
7735         }
7736 }
7737
7738 static void nf_tables_commit_release(struct net *net)
7739 {
7740         struct nft_trans *trans;
7741
7742         /* all side effects have to be made visible.
7743          * For example, if a chain named 'foo' has been deleted, a
7744          * new transaction must not find it anymore.
7745          *
7746          * Memory reclaim happens asynchronously from work queue
7747          * to prevent expensive synchronize_rcu() in commit phase.
7748          */
7749         if (list_empty(&net->nft.commit_list)) {
7750                 nf_tables_module_autoload_cleanup(net);
7751                 mutex_unlock(&net->nft.commit_mutex);
7752                 return;
7753         }
7754
7755         trans = list_last_entry(&net->nft.commit_list,
7756                                 struct nft_trans, list);
7757         get_net(trans->ctx.net);
7758         WARN_ON_ONCE(trans->put_net);
7759
7760         trans->put_net = true;
7761         spin_lock(&nf_tables_destroy_list_lock);
7762         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7763         spin_unlock(&nf_tables_destroy_list_lock);
7764
7765         nf_tables_module_autoload_cleanup(net);
7766         schedule_work(&trans_destroy_work);
7767
7768         mutex_unlock(&net->nft.commit_mutex);
7769 }
7770
7771 static void nft_commit_notify(struct net *net, u32 portid)
7772 {
7773         struct sk_buff *batch_skb = NULL, *nskb, *skb;
7774         unsigned char *data;
7775         int len;
7776
7777         list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7778                 if (!batch_skb) {
7779 new_batch:
7780                         batch_skb = skb;
7781                         len = NLMSG_GOODSIZE - skb->len;
7782                         list_del(&skb->list);
7783                         continue;
7784                 }
7785                 len -= skb->len;
7786                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7787                         data = skb_put(batch_skb, skb->len);
7788                         memcpy(data, skb->data, skb->len);
7789                         list_del(&skb->list);
7790                         kfree_skb(skb);
7791                         continue;
7792                 }
7793                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7794                                NFT_CB(batch_skb).report, GFP_KERNEL);
7795                 goto new_batch;
7796         }
7797
7798         if (batch_skb) {
7799                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7800                                NFT_CB(batch_skb).report, GFP_KERNEL);
7801         }
7802
7803         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
7804 }
7805
7806 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7807 {
7808         struct nft_trans *trans, *next;
7809         struct nft_trans_elem *te;
7810         struct nft_chain *chain;
7811         struct nft_table *table;
7812         int err;
7813
7814         if (list_empty(&net->nft.commit_list)) {
7815                 mutex_unlock(&net->nft.commit_mutex);
7816                 return 0;
7817         }
7818
7819         /* 0. Validate ruleset, otherwise roll back for error reporting. */
7820         if (nf_tables_validate(net) < 0)
7821                 return -EAGAIN;
7822
7823         err = nft_flow_rule_offload_commit(net);
7824         if (err < 0)
7825                 return err;
7826
7827         /* 1.  Allocate space for next generation rules_gen_X[] */
7828         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7829                 int ret;
7830
7831                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7832                     trans->msg_type == NFT_MSG_DELRULE) {
7833                         chain = trans->ctx.chain;
7834
7835                         ret = nf_tables_commit_chain_prepare(net, chain);
7836                         if (ret < 0) {
7837                                 nf_tables_commit_chain_prepare_cancel(net);
7838                                 return ret;
7839                         }
7840                 }
7841         }
7842
7843         /* step 2.  Make rules_gen_X visible to packet path */
7844         list_for_each_entry(table, &net->nft.tables, list) {
7845                 list_for_each_entry(chain, &table->chains, list)
7846                         nf_tables_commit_chain(net, chain);
7847         }
7848
7849         /*
7850          * Bump generation counter, invalidate any dump in progress.
7851          * Cannot fail after this point.
7852          */
7853         while (++net->nft.base_seq == 0);
7854
7855         /* step 3. Start new generation, rules_gen_X now in use. */
7856         net->nft.gencursor = nft_gencursor_next(net);
7857
7858         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7859                 switch (trans->msg_type) {
7860                 case NFT_MSG_NEWTABLE:
7861                         if (nft_trans_table_update(trans)) {
7862                                 if (!nft_trans_table_enable(trans)) {
7863                                         nf_tables_table_disable(net,
7864                                                                 trans->ctx.table);
7865                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7866                                 }
7867                         } else {
7868                                 nft_clear(net, trans->ctx.table);
7869                         }
7870                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7871                         nft_trans_destroy(trans);
7872                         break;
7873                 case NFT_MSG_DELTABLE:
7874                         list_del_rcu(&trans->ctx.table->list);
7875                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7876                         break;
7877                 case NFT_MSG_NEWCHAIN:
7878                         if (nft_trans_chain_update(trans)) {
7879                                 nft_chain_commit_update(trans);
7880                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7881                                 /* trans destroyed after rcu grace period */
7882                         } else {
7883                                 nft_chain_commit_drop_policy(trans);
7884                                 nft_clear(net, trans->ctx.chain);
7885                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7886                                 nft_trans_destroy(trans);
7887                         }
7888                         break;
7889                 case NFT_MSG_DELCHAIN:
7890                         nft_chain_del(trans->ctx.chain);
7891                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7892                         nf_tables_unregister_hook(trans->ctx.net,
7893                                                   trans->ctx.table,
7894                                                   trans->ctx.chain);
7895                         break;
7896                 case NFT_MSG_NEWRULE:
7897                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
7898                         nf_tables_rule_notify(&trans->ctx,
7899                                               nft_trans_rule(trans),
7900                                               NFT_MSG_NEWRULE);
7901                         nft_trans_destroy(trans);
7902                         break;
7903                 case NFT_MSG_DELRULE:
7904                         list_del_rcu(&nft_trans_rule(trans)->list);
7905                         nf_tables_rule_notify(&trans->ctx,
7906                                               nft_trans_rule(trans),
7907                                               NFT_MSG_DELRULE);
7908                         nft_rule_expr_deactivate(&trans->ctx,
7909                                                  nft_trans_rule(trans),
7910                                                  NFT_TRANS_COMMIT);
7911                         break;
7912                 case NFT_MSG_NEWSET:
7913                         nft_clear(net, nft_trans_set(trans));
7914                         /* This avoids hitting -EBUSY when deleting the table
7915                          * from the transaction.
7916                          */
7917                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7918                             !list_empty(&nft_trans_set(trans)->bindings))
7919                                 trans->ctx.table->use--;
7920
7921                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7922                                              NFT_MSG_NEWSET, GFP_KERNEL);
7923                         nft_trans_destroy(trans);
7924                         break;
7925                 case NFT_MSG_DELSET:
7926                         list_del_rcu(&nft_trans_set(trans)->list);
7927                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7928                                              NFT_MSG_DELSET, GFP_KERNEL);
7929                         break;
7930                 case NFT_MSG_NEWSETELEM:
7931                         te = (struct nft_trans_elem *)trans->data;
7932
7933                         te->set->ops->activate(net, te->set, &te->elem);
7934                         nf_tables_setelem_notify(&trans->ctx, te->set,
7935                                                  &te->elem,
7936                                                  NFT_MSG_NEWSETELEM, 0);
7937                         nft_trans_destroy(trans);
7938                         break;
7939                 case NFT_MSG_DELSETELEM:
7940                         te = (struct nft_trans_elem *)trans->data;
7941
7942                         nf_tables_setelem_notify(&trans->ctx, te->set,
7943                                                  &te->elem,
7944                                                  NFT_MSG_DELSETELEM, 0);
7945                         te->set->ops->remove(net, te->set, &te->elem);
7946                         atomic_dec(&te->set->nelems);
7947                         te->set->ndeact--;
7948                         break;
7949                 case NFT_MSG_NEWOBJ:
7950                         if (nft_trans_obj_update(trans)) {
7951                                 nft_obj_commit_update(trans);
7952                                 nf_tables_obj_notify(&trans->ctx,
7953                                                      nft_trans_obj(trans),
7954                                                      NFT_MSG_NEWOBJ);
7955                         } else {
7956                                 nft_clear(net, nft_trans_obj(trans));
7957                                 nf_tables_obj_notify(&trans->ctx,
7958                                                      nft_trans_obj(trans),
7959                                                      NFT_MSG_NEWOBJ);
7960                                 nft_trans_destroy(trans);
7961                         }
7962                         break;
7963                 case NFT_MSG_DELOBJ:
7964                         nft_obj_del(nft_trans_obj(trans));
7965                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7966                                              NFT_MSG_DELOBJ);
7967                         break;
7968                 case NFT_MSG_NEWFLOWTABLE:
7969                         if (nft_trans_flowtable_update(trans)) {
7970                                 nf_tables_flowtable_notify(&trans->ctx,
7971                                                            nft_trans_flowtable(trans),
7972                                                            &nft_trans_flowtable_hooks(trans),
7973                                                            NFT_MSG_NEWFLOWTABLE);
7974                                 list_splice(&nft_trans_flowtable_hooks(trans),
7975                                             &nft_trans_flowtable(trans)->hook_list);
7976                         } else {
7977                                 nft_clear(net, nft_trans_flowtable(trans));
7978                                 nf_tables_flowtable_notify(&trans->ctx,
7979                                                            nft_trans_flowtable(trans),
7980                                                            &nft_trans_flowtable(trans)->hook_list,
7981                                                            NFT_MSG_NEWFLOWTABLE);
7982                         }
7983                         nft_trans_destroy(trans);
7984                         break;
7985                 case NFT_MSG_DELFLOWTABLE:
7986                         if (nft_trans_flowtable_update(trans)) {
7987                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
7988                                                         &nft_trans_flowtable_hooks(trans));
7989                                 nf_tables_flowtable_notify(&trans->ctx,
7990                                                            nft_trans_flowtable(trans),
7991                                                            &nft_trans_flowtable_hooks(trans),
7992                                                            NFT_MSG_DELFLOWTABLE);
7993                                 nft_unregister_flowtable_net_hooks(net,
7994                                                                    &nft_trans_flowtable_hooks(trans));
7995                         } else {
7996                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
7997                                 nf_tables_flowtable_notify(&trans->ctx,
7998                                                            nft_trans_flowtable(trans),
7999                                                            &nft_trans_flowtable(trans)->hook_list,
8000                                                            NFT_MSG_DELFLOWTABLE);
8001                                 nft_unregister_flowtable_net_hooks(net,
8002                                                 &nft_trans_flowtable(trans)->hook_list);
8003                         }
8004                         break;
8005                 }
8006         }
8007
8008         nft_commit_notify(net, NETLINK_CB(skb).portid);
8009         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8010         nf_tables_commit_release(net);
8011
8012         return 0;
8013 }
8014
8015 static void nf_tables_module_autoload(struct net *net)
8016 {
8017         struct nft_module_request *req, *next;
8018         LIST_HEAD(module_list);
8019
8020         list_splice_init(&net->nft.module_list, &module_list);
8021         mutex_unlock(&net->nft.commit_mutex);
8022         list_for_each_entry_safe(req, next, &module_list, list) {
8023                 request_module("%s", req->module);
8024                 req->done = true;
8025         }
8026         mutex_lock(&net->nft.commit_mutex);
8027         list_splice(&module_list, &net->nft.module_list);
8028 }
8029
8030 static void nf_tables_abort_release(struct nft_trans *trans)
8031 {
8032         switch (trans->msg_type) {
8033         case NFT_MSG_NEWTABLE:
8034                 nf_tables_table_destroy(&trans->ctx);
8035                 break;
8036         case NFT_MSG_NEWCHAIN:
8037                 nf_tables_chain_destroy(&trans->ctx);
8038                 break;
8039         case NFT_MSG_NEWRULE:
8040                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8041                 break;
8042         case NFT_MSG_NEWSET:
8043                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8044                 break;
8045         case NFT_MSG_NEWSETELEM:
8046                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8047                                      nft_trans_elem(trans).priv, true);
8048                 break;
8049         case NFT_MSG_NEWOBJ:
8050                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8051                 break;
8052         case NFT_MSG_NEWFLOWTABLE:
8053                 if (nft_trans_flowtable_update(trans))
8054                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8055                 else
8056                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8057                 break;
8058         }
8059         kfree(trans);
8060 }
8061
8062 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8063 {
8064         struct nft_trans *trans, *next;
8065         struct nft_trans_elem *te;
8066         struct nft_hook *hook;
8067
8068         if (action == NFNL_ABORT_VALIDATE &&
8069             nf_tables_validate(net) < 0)
8070                 return -EAGAIN;
8071
8072         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8073                                          list) {
8074                 switch (trans->msg_type) {
8075                 case NFT_MSG_NEWTABLE:
8076                         if (nft_trans_table_update(trans)) {
8077                                 if (nft_trans_table_enable(trans)) {
8078                                         nf_tables_table_disable(net,
8079                                                                 trans->ctx.table);
8080                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8081                                 }
8082                                 nft_trans_destroy(trans);
8083                         } else {
8084                                 list_del_rcu(&trans->ctx.table->list);
8085                         }
8086                         break;
8087                 case NFT_MSG_DELTABLE:
8088                         nft_clear(trans->ctx.net, trans->ctx.table);
8089                         nft_trans_destroy(trans);
8090                         break;
8091                 case NFT_MSG_NEWCHAIN:
8092                         if (nft_trans_chain_update(trans)) {
8093                                 free_percpu(nft_trans_chain_stats(trans));
8094                                 kfree(nft_trans_chain_name(trans));
8095                                 nft_trans_destroy(trans);
8096                         } else {
8097                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8098                                         nft_trans_destroy(trans);
8099                                         break;
8100                                 }
8101                                 trans->ctx.table->use--;
8102                                 nft_chain_del(trans->ctx.chain);
8103                                 nf_tables_unregister_hook(trans->ctx.net,
8104                                                           trans->ctx.table,
8105                                                           trans->ctx.chain);
8106                         }
8107                         break;
8108                 case NFT_MSG_DELCHAIN:
8109                         trans->ctx.table->use++;
8110                         nft_clear(trans->ctx.net, trans->ctx.chain);
8111                         nft_trans_destroy(trans);
8112                         break;
8113                 case NFT_MSG_NEWRULE:
8114                         trans->ctx.chain->use--;
8115                         list_del_rcu(&nft_trans_rule(trans)->list);
8116                         nft_rule_expr_deactivate(&trans->ctx,
8117                                                  nft_trans_rule(trans),
8118                                                  NFT_TRANS_ABORT);
8119                         break;
8120                 case NFT_MSG_DELRULE:
8121                         trans->ctx.chain->use++;
8122                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8123                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8124                         nft_trans_destroy(trans);
8125                         break;
8126                 case NFT_MSG_NEWSET:
8127                         trans->ctx.table->use--;
8128                         if (nft_trans_set_bound(trans)) {
8129                                 nft_trans_destroy(trans);
8130                                 break;
8131                         }
8132                         list_del_rcu(&nft_trans_set(trans)->list);
8133                         break;
8134                 case NFT_MSG_DELSET:
8135                         trans->ctx.table->use++;
8136                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8137                         nft_trans_destroy(trans);
8138                         break;
8139                 case NFT_MSG_NEWSETELEM:
8140                         if (nft_trans_elem_set_bound(trans)) {
8141                                 nft_trans_destroy(trans);
8142                                 break;
8143                         }
8144                         te = (struct nft_trans_elem *)trans->data;
8145                         te->set->ops->remove(net, te->set, &te->elem);
8146                         atomic_dec(&te->set->nelems);
8147                         break;
8148                 case NFT_MSG_DELSETELEM:
8149                         te = (struct nft_trans_elem *)trans->data;
8150
8151                         nft_set_elem_activate(net, te->set, &te->elem);
8152                         te->set->ops->activate(net, te->set, &te->elem);
8153                         te->set->ndeact--;
8154
8155                         nft_trans_destroy(trans);
8156                         break;
8157                 case NFT_MSG_NEWOBJ:
8158                         if (nft_trans_obj_update(trans)) {
8159                                 kfree(nft_trans_obj_newobj(trans));
8160                                 nft_trans_destroy(trans);
8161                         } else {
8162                                 trans->ctx.table->use--;
8163                                 nft_obj_del(nft_trans_obj(trans));
8164                         }
8165                         break;
8166                 case NFT_MSG_DELOBJ:
8167                         trans->ctx.table->use++;
8168                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8169                         nft_trans_destroy(trans);
8170                         break;
8171                 case NFT_MSG_NEWFLOWTABLE:
8172                         if (nft_trans_flowtable_update(trans)) {
8173                                 nft_unregister_flowtable_net_hooks(net,
8174                                                 &nft_trans_flowtable_hooks(trans));
8175                         } else {
8176                                 trans->ctx.table->use--;
8177                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8178                                 nft_unregister_flowtable_net_hooks(net,
8179                                                 &nft_trans_flowtable(trans)->hook_list);
8180                         }
8181                         break;
8182                 case NFT_MSG_DELFLOWTABLE:
8183                         if (nft_trans_flowtable_update(trans)) {
8184                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8185                                         hook->inactive = false;
8186                         } else {
8187                                 trans->ctx.table->use++;
8188                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8189                         }
8190                         nft_trans_destroy(trans);
8191                         break;
8192                 }
8193         }
8194
8195         synchronize_rcu();
8196
8197         list_for_each_entry_safe_reverse(trans, next,
8198                                          &net->nft.commit_list, list) {
8199                 list_del(&trans->list);
8200                 nf_tables_abort_release(trans);
8201         }
8202
8203         if (action == NFNL_ABORT_AUTOLOAD)
8204                 nf_tables_module_autoload(net);
8205         else
8206                 nf_tables_module_autoload_cleanup(net);
8207
8208         return 0;
8209 }
8210
8211 static void nf_tables_cleanup(struct net *net)
8212 {
8213         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8214 }
8215
8216 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8217                            enum nfnl_abort_action action)
8218 {
8219         int ret = __nf_tables_abort(net, action);
8220
8221         mutex_unlock(&net->nft.commit_mutex);
8222
8223         return ret;
8224 }
8225
8226 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8227 {
8228         bool genid_ok;
8229
8230         mutex_lock(&net->nft.commit_mutex);
8231
8232         genid_ok = genid == 0 || net->nft.base_seq == genid;
8233         if (!genid_ok)
8234                 mutex_unlock(&net->nft.commit_mutex);
8235
8236         /* else, commit mutex has to be released by commit or abort function */
8237         return genid_ok;
8238 }
8239
8240 static const struct nfnetlink_subsystem nf_tables_subsys = {
8241         .name           = "nf_tables",
8242         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8243         .cb_count       = NFT_MSG_MAX,
8244         .cb             = nf_tables_cb,
8245         .commit         = nf_tables_commit,
8246         .abort          = nf_tables_abort,
8247         .cleanup        = nf_tables_cleanup,
8248         .valid_genid    = nf_tables_valid_genid,
8249         .owner          = THIS_MODULE,
8250 };
8251
8252 int nft_chain_validate_dependency(const struct nft_chain *chain,
8253                                   enum nft_chain_types type)
8254 {
8255         const struct nft_base_chain *basechain;
8256
8257         if (nft_is_base_chain(chain)) {
8258                 basechain = nft_base_chain(chain);
8259                 if (basechain->type->type != type)
8260                         return -EOPNOTSUPP;
8261         }
8262         return 0;
8263 }
8264 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8265
8266 int nft_chain_validate_hooks(const struct nft_chain *chain,
8267                              unsigned int hook_flags)
8268 {
8269         struct nft_base_chain *basechain;
8270
8271         if (nft_is_base_chain(chain)) {
8272                 basechain = nft_base_chain(chain);
8273
8274                 if ((1 << basechain->ops.hooknum) & hook_flags)
8275                         return 0;
8276
8277                 return -EOPNOTSUPP;
8278         }
8279
8280         return 0;
8281 }
8282 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8283
8284 /*
8285  * Loop detection - walk through the ruleset beginning at the destination chain
8286  * of a new jump until either the source chain is reached (loop) or all
8287  * reachable chains have been traversed.
8288  *
8289  * The loop check is performed whenever a new jump verdict is added to an
8290  * expression or verdict map or a verdict map is bound to a new chain.
8291  */
8292
8293 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8294                                  const struct nft_chain *chain);
8295
8296 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8297                                         struct nft_set *set,
8298                                         const struct nft_set_iter *iter,
8299                                         struct nft_set_elem *elem)
8300 {
8301         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8302         const struct nft_data *data;
8303
8304         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8305             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8306                 return 0;
8307
8308         data = nft_set_ext_data(ext);
8309         switch (data->verdict.code) {
8310         case NFT_JUMP:
8311         case NFT_GOTO:
8312                 return nf_tables_check_loops(ctx, data->verdict.chain);
8313         default:
8314                 return 0;
8315         }
8316 }
8317
8318 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8319                                  const struct nft_chain *chain)
8320 {
8321         const struct nft_rule *rule;
8322         const struct nft_expr *expr, *last;
8323         struct nft_set *set;
8324         struct nft_set_binding *binding;
8325         struct nft_set_iter iter;
8326
8327         if (ctx->chain == chain)
8328                 return -ELOOP;
8329
8330         list_for_each_entry(rule, &chain->rules, list) {
8331                 nft_rule_for_each_expr(expr, last, rule) {
8332                         struct nft_immediate_expr *priv;
8333                         const struct nft_data *data;
8334                         int err;
8335
8336                         if (strcmp(expr->ops->type->name, "immediate"))
8337                                 continue;
8338
8339                         priv = nft_expr_priv(expr);
8340                         if (priv->dreg != NFT_REG_VERDICT)
8341                                 continue;
8342
8343                         data = &priv->data;
8344                         switch (data->verdict.code) {
8345                         case NFT_JUMP:
8346                         case NFT_GOTO:
8347                                 err = nf_tables_check_loops(ctx,
8348                                                         data->verdict.chain);
8349                                 if (err < 0)
8350                                         return err;
8351                         default:
8352                                 break;
8353                         }
8354                 }
8355         }
8356
8357         list_for_each_entry(set, &ctx->table->sets, list) {
8358                 if (!nft_is_active_next(ctx->net, set))
8359                         continue;
8360                 if (!(set->flags & NFT_SET_MAP) ||
8361                     set->dtype != NFT_DATA_VERDICT)
8362                         continue;
8363
8364                 list_for_each_entry(binding, &set->bindings, list) {
8365                         if (!(binding->flags & NFT_SET_MAP) ||
8366                             binding->chain != chain)
8367                                 continue;
8368
8369                         iter.genmask    = nft_genmask_next(ctx->net);
8370                         iter.skip       = 0;
8371                         iter.count      = 0;
8372                         iter.err        = 0;
8373                         iter.fn         = nf_tables_loop_check_setelem;
8374
8375                         set->ops->walk(ctx, set, &iter);
8376                         if (iter.err < 0)
8377                                 return iter.err;
8378                 }
8379         }
8380
8381         return 0;
8382 }
8383
8384 /**
8385  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8386  *
8387  *      @attr: netlink attribute to fetch value from
8388  *      @max: maximum value to be stored in dest
8389  *      @dest: pointer to the variable
8390  *
8391  *      Parse, check and store a given u32 netlink attribute into variable.
8392  *      This function returns -ERANGE if the value goes over maximum value.
8393  *      Otherwise a 0 is returned and the attribute value is stored in the
8394  *      destination variable.
8395  */
8396 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8397 {
8398         u32 val;
8399
8400         val = ntohl(nla_get_be32(attr));
8401         if (val > max)
8402                 return -ERANGE;
8403
8404         *dest = val;
8405         return 0;
8406 }
8407 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8408
8409 /**
8410  *      nft_parse_register - parse a register value from a netlink attribute
8411  *
8412  *      @attr: netlink attribute
8413  *
8414  *      Parse and translate a register value from a netlink attribute.
8415  *      Registers used to be 128 bit wide, these register numbers will be
8416  *      mapped to the corresponding 32 bit register numbers.
8417  */
8418 unsigned int nft_parse_register(const struct nlattr *attr)
8419 {
8420         unsigned int reg;
8421
8422         reg = ntohl(nla_get_be32(attr));
8423         switch (reg) {
8424         case NFT_REG_VERDICT...NFT_REG_4:
8425                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8426         default:
8427                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8428         }
8429 }
8430 EXPORT_SYMBOL_GPL(nft_parse_register);
8431
8432 /**
8433  *      nft_dump_register - dump a register value to a netlink attribute
8434  *
8435  *      @skb: socket buffer
8436  *      @attr: attribute number
8437  *      @reg: register number
8438  *
8439  *      Construct a netlink attribute containing the register number. For
8440  *      compatibility reasons, register numbers being a multiple of 4 are
8441  *      translated to the corresponding 128 bit register numbers.
8442  */
8443 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8444 {
8445         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8446                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8447         else
8448                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8449
8450         return nla_put_be32(skb, attr, htonl(reg));
8451 }
8452 EXPORT_SYMBOL_GPL(nft_dump_register);
8453
8454 /**
8455  *      nft_validate_register_load - validate a load from a register
8456  *
8457  *      @reg: the register number
8458  *      @len: the length of the data
8459  *
8460  *      Validate that the input register is one of the general purpose
8461  *      registers and that the length of the load is within the bounds.
8462  */
8463 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8464 {
8465         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8466                 return -EINVAL;
8467         if (len == 0)
8468                 return -EINVAL;
8469         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8470                 return -ERANGE;
8471
8472         return 0;
8473 }
8474 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8475
8476 /**
8477  *      nft_validate_register_store - validate an expressions' register store
8478  *
8479  *      @ctx: context of the expression performing the load
8480  *      @reg: the destination register number
8481  *      @data: the data to load
8482  *      @type: the data type
8483  *      @len: the length of the data
8484  *
8485  *      Validate that a data load uses the appropriate data type for
8486  *      the destination register and the length is within the bounds.
8487  *      A value of NULL for the data means that its runtime gathered
8488  *      data.
8489  */
8490 int nft_validate_register_store(const struct nft_ctx *ctx,
8491                                 enum nft_registers reg,
8492                                 const struct nft_data *data,
8493                                 enum nft_data_types type, unsigned int len)
8494 {
8495         int err;
8496
8497         switch (reg) {
8498         case NFT_REG_VERDICT:
8499                 if (type != NFT_DATA_VERDICT)
8500                         return -EINVAL;
8501
8502                 if (data != NULL &&
8503                     (data->verdict.code == NFT_GOTO ||
8504                      data->verdict.code == NFT_JUMP)) {
8505                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8506                         if (err < 0)
8507                                 return err;
8508                 }
8509
8510                 return 0;
8511         default:
8512                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8513                         return -EINVAL;
8514                 if (len == 0)
8515                         return -EINVAL;
8516                 if (reg * NFT_REG32_SIZE + len >
8517                     sizeof_field(struct nft_regs, data))
8518                         return -ERANGE;
8519
8520                 if (data != NULL && type != NFT_DATA_VALUE)
8521                         return -EINVAL;
8522                 return 0;
8523         }
8524 }
8525 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8526
8527 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8528         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8529         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8530                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8531         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8532 };
8533
8534 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8535                             struct nft_data_desc *desc, const struct nlattr *nla)
8536 {
8537         u8 genmask = nft_genmask_next(ctx->net);
8538         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8539         struct nft_chain *chain;
8540         int err;
8541
8542         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8543                                           nft_verdict_policy, NULL);
8544         if (err < 0)
8545                 return err;
8546
8547         if (!tb[NFTA_VERDICT_CODE])
8548                 return -EINVAL;
8549         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8550
8551         switch (data->verdict.code) {
8552         default:
8553                 switch (data->verdict.code & NF_VERDICT_MASK) {
8554                 case NF_ACCEPT:
8555                 case NF_DROP:
8556                 case NF_QUEUE:
8557                         break;
8558                 default:
8559                         return -EINVAL;
8560                 }
8561                 fallthrough;
8562         case NFT_CONTINUE:
8563         case NFT_BREAK:
8564         case NFT_RETURN:
8565                 break;
8566         case NFT_JUMP:
8567         case NFT_GOTO:
8568                 if (tb[NFTA_VERDICT_CHAIN]) {
8569                         chain = nft_chain_lookup(ctx->net, ctx->table,
8570                                                  tb[NFTA_VERDICT_CHAIN],
8571                                                  genmask);
8572                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8573                         chain = nft_chain_lookup_byid(ctx->net,
8574                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8575                         if (IS_ERR(chain))
8576                                 return PTR_ERR(chain);
8577                 } else {
8578                         return -EINVAL;
8579                 }
8580
8581                 if (IS_ERR(chain))
8582                         return PTR_ERR(chain);
8583                 if (nft_is_base_chain(chain))
8584                         return -EOPNOTSUPP;
8585
8586                 chain->use++;
8587                 data->verdict.chain = chain;
8588                 break;
8589         }
8590
8591         desc->len = sizeof(data->verdict);
8592         desc->type = NFT_DATA_VERDICT;
8593         return 0;
8594 }
8595
8596 static void nft_verdict_uninit(const struct nft_data *data)
8597 {
8598         struct nft_chain *chain;
8599         struct nft_rule *rule;
8600
8601         switch (data->verdict.code) {
8602         case NFT_JUMP:
8603         case NFT_GOTO:
8604                 chain = data->verdict.chain;
8605                 chain->use--;
8606
8607                 if (!nft_chain_is_bound(chain))
8608                         break;
8609
8610                 chain->table->use--;
8611                 list_for_each_entry(rule, &chain->rules, list)
8612                         chain->use--;
8613
8614                 nft_chain_del(chain);
8615                 break;
8616         }
8617 }
8618
8619 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8620 {
8621         struct nlattr *nest;
8622
8623         nest = nla_nest_start_noflag(skb, type);
8624         if (!nest)
8625                 goto nla_put_failure;
8626
8627         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8628                 goto nla_put_failure;
8629
8630         switch (v->code) {
8631         case NFT_JUMP:
8632         case NFT_GOTO:
8633                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8634                                    v->chain->name))
8635                         goto nla_put_failure;
8636         }
8637         nla_nest_end(skb, nest);
8638         return 0;
8639
8640 nla_put_failure:
8641         return -1;
8642 }
8643
8644 static int nft_value_init(const struct nft_ctx *ctx,
8645                           struct nft_data *data, unsigned int size,
8646                           struct nft_data_desc *desc, const struct nlattr *nla)
8647 {
8648         unsigned int len;
8649
8650         len = nla_len(nla);
8651         if (len == 0)
8652                 return -EINVAL;
8653         if (len > size)
8654                 return -EOVERFLOW;
8655
8656         nla_memcpy(data->data, nla, len);
8657         desc->type = NFT_DATA_VALUE;
8658         desc->len  = len;
8659         return 0;
8660 }
8661
8662 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8663                           unsigned int len)
8664 {
8665         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8666 }
8667
8668 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8669         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8670         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8671 };
8672
8673 /**
8674  *      nft_data_init - parse nf_tables data netlink attributes
8675  *
8676  *      @ctx: context of the expression using the data
8677  *      @data: destination struct nft_data
8678  *      @size: maximum data length
8679  *      @desc: data description
8680  *      @nla: netlink attribute containing data
8681  *
8682  *      Parse the netlink data attributes and initialize a struct nft_data.
8683  *      The type and length of data are returned in the data description.
8684  *
8685  *      The caller can indicate that it only wants to accept data of type
8686  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8687  */
8688 int nft_data_init(const struct nft_ctx *ctx,
8689                   struct nft_data *data, unsigned int size,
8690                   struct nft_data_desc *desc, const struct nlattr *nla)
8691 {
8692         struct nlattr *tb[NFTA_DATA_MAX + 1];
8693         int err;
8694
8695         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8696                                           nft_data_policy, NULL);
8697         if (err < 0)
8698                 return err;
8699
8700         if (tb[NFTA_DATA_VALUE])
8701                 return nft_value_init(ctx, data, size, desc,
8702                                       tb[NFTA_DATA_VALUE]);
8703         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8704                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8705         return -EINVAL;
8706 }
8707 EXPORT_SYMBOL_GPL(nft_data_init);
8708
8709 /**
8710  *      nft_data_release - release a nft_data item
8711  *
8712  *      @data: struct nft_data to release
8713  *      @type: type of data
8714  *
8715  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8716  *      all others need to be released by calling this function.
8717  */
8718 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8719 {
8720         if (type < NFT_DATA_VERDICT)
8721                 return;
8722         switch (type) {
8723         case NFT_DATA_VERDICT:
8724                 return nft_verdict_uninit(data);
8725         default:
8726                 WARN_ON(1);
8727         }
8728 }
8729 EXPORT_SYMBOL_GPL(nft_data_release);
8730
8731 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8732                   enum nft_data_types type, unsigned int len)
8733 {
8734         struct nlattr *nest;
8735         int err;
8736
8737         nest = nla_nest_start_noflag(skb, attr);
8738         if (nest == NULL)
8739                 return -1;
8740
8741         switch (type) {
8742         case NFT_DATA_VALUE:
8743                 err = nft_value_dump(skb, data, len);
8744                 break;
8745         case NFT_DATA_VERDICT:
8746                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8747                 break;
8748         default:
8749                 err = -EINVAL;
8750                 WARN_ON(1);
8751         }
8752
8753         nla_nest_end(skb, nest);
8754         return err;
8755 }
8756 EXPORT_SYMBOL_GPL(nft_data_dump);
8757
8758 int __nft_release_basechain(struct nft_ctx *ctx)
8759 {
8760         struct nft_rule *rule, *nr;
8761
8762         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8763                 return 0;
8764
8765         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8766         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8767                 list_del(&rule->list);
8768                 ctx->chain->use--;
8769                 nf_tables_rule_release(ctx, rule);
8770         }
8771         nft_chain_del(ctx->chain);
8772         ctx->table->use--;
8773         nf_tables_chain_destroy(ctx);
8774
8775         return 0;
8776 }
8777 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8778
8779 static void __nft_release_tables(struct net *net)
8780 {
8781         struct nft_flowtable *flowtable, *nf;
8782         struct nft_table *table, *nt;
8783         struct nft_chain *chain, *nc;
8784         struct nft_object *obj, *ne;
8785         struct nft_rule *rule, *nr;
8786         struct nft_set *set, *ns;
8787         struct nft_ctx ctx = {
8788                 .net    = net,
8789                 .family = NFPROTO_NETDEV,
8790         };
8791
8792         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8793                 ctx.family = table->family;
8794
8795                 list_for_each_entry(chain, &table->chains, list)
8796                         nf_tables_unregister_hook(net, table, chain);
8797                 /* No packets are walking on these chains anymore. */
8798                 ctx.table = table;
8799                 list_for_each_entry(chain, &table->chains, list) {
8800                         ctx.chain = chain;
8801                         list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8802                                 list_del(&rule->list);
8803                                 chain->use--;
8804                                 nf_tables_rule_release(&ctx, rule);
8805                         }
8806                 }
8807                 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8808                         list_del(&flowtable->list);
8809                         table->use--;
8810                         nf_tables_flowtable_destroy(flowtable);
8811                 }
8812                 list_for_each_entry_safe(set, ns, &table->sets, list) {
8813                         list_del(&set->list);
8814                         table->use--;
8815                         nft_set_destroy(&ctx, set);
8816                 }
8817                 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8818                         nft_obj_del(obj);
8819                         table->use--;
8820                         nft_obj_destroy(&ctx, obj);
8821                 }
8822                 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8823                         ctx.chain = chain;
8824                         nft_chain_del(chain);
8825                         table->use--;
8826                         nf_tables_chain_destroy(&ctx);
8827                 }
8828                 list_del(&table->list);
8829                 nf_tables_table_destroy(&ctx);
8830         }
8831 }
8832
8833 static int __net_init nf_tables_init_net(struct net *net)
8834 {
8835         INIT_LIST_HEAD(&net->nft.tables);
8836         INIT_LIST_HEAD(&net->nft.commit_list);
8837         INIT_LIST_HEAD(&net->nft.module_list);
8838         INIT_LIST_HEAD(&net->nft.notify_list);
8839         mutex_init(&net->nft.commit_mutex);
8840         net->nft.base_seq = 1;
8841         net->nft.validate_state = NFT_VALIDATE_SKIP;
8842
8843         return 0;
8844 }
8845
8846 static void __net_exit nf_tables_exit_net(struct net *net)
8847 {
8848         mutex_lock(&net->nft.commit_mutex);
8849         if (!list_empty(&net->nft.commit_list))
8850                 __nf_tables_abort(net, NFNL_ABORT_NONE);
8851         __nft_release_tables(net);
8852         mutex_unlock(&net->nft.commit_mutex);
8853         WARN_ON_ONCE(!list_empty(&net->nft.tables));
8854         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
8855         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8856 }
8857
8858 static struct pernet_operations nf_tables_net_ops = {
8859         .init   = nf_tables_init_net,
8860         .exit   = nf_tables_exit_net,
8861 };
8862
8863 static int __init nf_tables_module_init(void)
8864 {
8865         int err;
8866
8867         spin_lock_init(&nf_tables_destroy_list_lock);
8868         err = register_pernet_subsys(&nf_tables_net_ops);
8869         if (err < 0)
8870                 return err;
8871
8872         err = nft_chain_filter_init();
8873         if (err < 0)
8874                 goto err1;
8875
8876         err = nf_tables_core_module_init();
8877         if (err < 0)
8878                 goto err2;
8879
8880         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8881         if (err < 0)
8882                 goto err3;
8883
8884         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8885         if (err < 0)
8886                 goto err4;
8887
8888         err = nft_offload_init();
8889         if (err < 0)
8890                 goto err5;
8891
8892         /* must be last */
8893         err = nfnetlink_subsys_register(&nf_tables_subsys);
8894         if (err < 0)
8895                 goto err6;
8896
8897         nft_chain_route_init();
8898
8899         return err;
8900 err6:
8901         nft_offload_exit();
8902 err5:
8903         rhltable_destroy(&nft_objname_ht);
8904 err4:
8905         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8906 err3:
8907         nf_tables_core_module_exit();
8908 err2:
8909         nft_chain_filter_fini();
8910 err1:
8911         unregister_pernet_subsys(&nf_tables_net_ops);
8912         return err;
8913 }
8914
8915 static void __exit nf_tables_module_exit(void)
8916 {
8917         nfnetlink_subsys_unregister(&nf_tables_subsys);
8918         nft_offload_exit();
8919         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8920         nft_chain_filter_fini();
8921         nft_chain_route_fini();
8922         unregister_pernet_subsys(&nf_tables_net_ops);
8923         cancel_work_sync(&trans_destroy_work);
8924         rcu_barrier();
8925         rhltable_destroy(&nft_objname_ht);
8926         nf_tables_core_module_exit();
8927 }
8928
8929 module_init(nf_tables_module_init);
8930 module_exit(nf_tables_module_exit);
8931
8932 MODULE_LICENSE("GPL");
8933 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8934 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);