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         WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 624 #endif
 625 }
 626
 627 static const struct nft_chain_type *
 628 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 629                             u8 family, bool autoload)
 630 {
 631         const struct nft_chain_type *type;
 632
 633         type = __nf_tables_chain_type_lookup(nla, family);
 634         if (type != NULL)
 635                 return type;
 636
 637         lockdep_nfnl_nft_mutex_not_held();
 638 #ifdef CONFIG_MODULES
 639         if (autoload) {
 640                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 641                                        nla_len(nla),
 642                                        (const char *)nla_data(nla)) == -EAGAIN)
 643                         return ERR_PTR(-EAGAIN);
 644         }
 645 #endif
 646         return ERR_PTR(-ENOENT);
 647 }
 648
 649 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 650         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 651                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 652         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 653         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 654         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 655                                     .len = NFT_USERDATA_MAXLEN }
 656 };
 657
 658 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 659                                      u32 portid, u32 seq, int event, u32 flags,
 660                                      int family, const struct nft_table *table)
 661 {
 662         struct nlmsghdr *nlh;
 663         struct nfgenmsg *nfmsg;
 664
 665         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 666         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
 667         if (nlh == NULL)
 668                 goto nla_put_failure;
 669
 670         nfmsg = nlmsg_data(nlh);
 671         nfmsg->nfgen_family     = family;
 672         nfmsg->version          = NFNETLINK_V0;
 673         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
 674
 675         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 676             nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
 677             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 678             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 679                          NFTA_TABLE_PAD))
 680                 goto nla_put_failure;
 681
 682         if (table->udata) {
 683                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 684                         goto nla_put_failure;
 685         }
 686
 687         nlmsg_end(skb, nlh);
 688         return 0;
 689
 690 nla_put_failure:
 691         nlmsg_trim(skb, nlh);
 692         return -1;
 693 }
 694
 695 struct nftnl_skb_parms {
 696         bool report;
 697 };
 698 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 699
 700 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 701                                struct list_head *notify_list)
 702 {
 703         NFT_CB(skb).report = report;
 704         list_add_tail(&skb->list, notify_list);
 705 }
 706
 707 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 708 {
 709         struct sk_buff *skb;
 710         int err;
 711         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
 712                               ctx->table->name, ctx->table->handle);
 713
 714         audit_log_nfcfg(buf,
 715                         ctx->family,
 716                         ctx->table->use,
 717                         event == NFT_MSG_NEWTABLE ?
 718                                 AUDIT_NFT_OP_TABLE_REGISTER :
 719                                 AUDIT_NFT_OP_TABLE_UNREGISTER,
 720                         GFP_KERNEL);
 721         kfree(buf);
 722
 723         if (!ctx->report &&
 724             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 725                 return;
 726
 727         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 728         if (skb == NULL)
 729                 goto err;
 730
 731         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 732                                         event, 0, ctx->family, ctx->table);
 733         if (err < 0) {
 734                 kfree_skb(skb);
 735                 goto err;
 736         }
 737
 738         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
 739         return;
 740 err:
 741         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 742 }
 743
 744 static int nf_tables_dump_tables(struct sk_buff *skb,
 745                                  struct netlink_callback *cb)
 746 {
 747         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 748         const struct nft_table *table;
 749         unsigned int idx = 0, s_idx = cb->args[0];
 750         struct net *net = sock_net(skb->sk);
 751         int family = nfmsg->nfgen_family;
 752
 753         rcu_read_lock();
 754         cb->seq = net->nft.base_seq;
 755
 756         list_for_each_entry_rcu(table, &net->nft.tables, list) {
 757                 if (family != NFPROTO_UNSPEC && family != table->family)
 758                         continue;
 759
 760                 if (idx < s_idx)
 761                         goto cont;
 762                 if (idx > s_idx)
 763                         memset(&cb->args[1], 0,
 764                                sizeof(cb->args) - sizeof(cb->args[0]));
 765                 if (!nft_is_active(net, table))
 766                         continue;
 767                 if (nf_tables_fill_table_info(skb, net,
 768                                               NETLINK_CB(cb->skb).portid,
 769                                               cb->nlh->nlmsg_seq,
 770                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 771                                               table->family, table) < 0)
 772                         goto done;
 773
 774                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 775 cont:
 776                 idx++;
 777         }
 778 done:
 779         rcu_read_unlock();
 780         cb->args[0] = idx;
 781         return skb->len;
 782 }
 783
 784 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 785                                       const struct nlmsghdr *nlh,
 786                                       struct netlink_dump_control *c)
 787 {
 788         int err;
 789
 790         if (!try_module_get(THIS_MODULE))
 791                 return -EINVAL;
 792
 793         rcu_read_unlock();
 794         err = netlink_dump_start(nlsk, skb, nlh, c);
 795         rcu_read_lock();
 796         module_put(THIS_MODULE);
 797
 798         return err;
 799 }
 800
 801 /* called with rcu_read_lock held */
 802 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
 803                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 804                               const struct nlattr * const nla[],
 805                               struct netlink_ext_ack *extack)
 806 {
 807         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 808         u8 genmask = nft_genmask_cur(net);
 809         const struct nft_table *table;
 810         struct sk_buff *skb2;
 811         int family = nfmsg->nfgen_family;
 812         int err;
 813
 814         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 815                 struct netlink_dump_control c = {
 816                         .dump = nf_tables_dump_tables,
 817                         .module = THIS_MODULE,
 818                 };
 819
 820                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
 821         }
 822
 823         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
 824         if (IS_ERR(table)) {
 825                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 826                 return PTR_ERR(table);
 827         }
 828
 829         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 830         if (!skb2)
 831                 return -ENOMEM;
 832
 833         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 834                                         nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
 835                                         family, table);
 836         if (err < 0)
 837                 goto err_fill_table_info;
 838
 839         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 840
 841 err_fill_table_info:
 842         kfree_skb(skb2);
 843         return err;
 844 }
 845
 846 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 847 {
 848         struct nft_chain *chain;
 849         u32 i = 0;
 850
 851         list_for_each_entry(chain, &table->chains, list) {
 852                 if (!nft_is_active_next(net, chain))
 853                         continue;
 854                 if (!nft_is_base_chain(chain))
 855                         continue;
 856
 857                 if (cnt && i++ == cnt)
 858                         break;
 859
 860                 nf_tables_unregister_hook(net, table, chain);
 861         }
 862 }
 863
 864 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 865 {
 866         struct nft_chain *chain;
 867         int err, i = 0;
 868
 869         list_for_each_entry(chain, &table->chains, list) {
 870                 if (!nft_is_active_next(net, chain))
 871                         continue;
 872                 if (!nft_is_base_chain(chain))
 873                         continue;
 874
 875                 err = nf_tables_register_hook(net, table, chain);
 876                 if (err < 0)
 877                         goto err_register_hooks;
 878
 879                 i++;
 880         }
 881         return 0;
 882
 883 err_register_hooks:
 884         if (i)
 885                 nft_table_disable(net, table, i);
 886         return err;
 887 }
 888
 889 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 890 {
 891         nft_table_disable(net, table, 0);
 892 }
 893
 894 static int nf_tables_updtable(struct nft_ctx *ctx)
 895 {
 896         struct nft_trans *trans;
 897         u32 flags;
 898         int ret = 0;
 899
 900         if (!ctx->nla[NFTA_TABLE_FLAGS])
 901                 return 0;
 902
 903         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 904         if (flags & ~NFT_TABLE_F_DORMANT)
 905                 return -EINVAL;
 906
 907         if (flags == ctx->table->flags)
 908                 return 0;
 909
 910         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 911                                 sizeof(struct nft_trans_table));
 912         if (trans == NULL)
 913                 return -ENOMEM;
 914
 915         if ((flags & NFT_TABLE_F_DORMANT) &&
 916             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 917                 nft_trans_table_enable(trans) = false;
 918         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
 919                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
 920                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
 921                 ret = nf_tables_table_enable(ctx->net, ctx->table);
 922                 if (ret >= 0)
 923                         nft_trans_table_enable(trans) = true;
 924                 else
 925                         ctx->table->flags |= NFT_TABLE_F_DORMANT;
 926         }
 927         if (ret < 0)
 928                 goto err;
 929
 930         nft_trans_table_update(trans) = true;
 931         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
 932         return 0;
 933 err:
 934         nft_trans_destroy(trans);
 935         return ret;
 936 }
 937
 938 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
 939 {
 940         const char *name = data;
 941
 942         return jhash(name, strlen(name), seed);
 943 }
 944
 945 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
 946 {
 947         const struct nft_chain *chain = data;
 948
 949         return nft_chain_hash(chain->name, 0, seed);
 950 }
 951
 952 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
 953                               const void *ptr)
 954 {
 955         const struct nft_chain *chain = ptr;
 956         const char *name = arg->key;
 957
 958         return strcmp(chain->name, name);
 959 }
 960
 961 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
 962 {
 963         const struct nft_object_hash_key *k = data;
 964
 965         seed ^= hash_ptr(k->table, 32);
 966
 967         return jhash(k->name, strlen(k->name), seed);
 968 }
 969
 970 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
 971 {
 972         const struct nft_object *obj = data;
 973
 974         return nft_objname_hash(&obj->key, 0, seed);
 975 }
 976
 977 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
 978                                 const void *ptr)
 979 {
 980         const struct nft_object_hash_key *k = arg->key;
 981         const struct nft_object *obj = ptr;
 982
 983         if (obj->key.table != k->table)
 984                 return -1;
 985
 986         return strcmp(obj->key.name, k->name);
 987 }
 988
 989 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
 990                               struct sk_buff *skb, const struct nlmsghdr *nlh,
 991                               const struct nlattr * const nla[],
 992                               struct netlink_ext_ack *extack)
 993 {
 994         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 995         u8 genmask = nft_genmask_next(net);
 996         int family = nfmsg->nfgen_family;
 997         const struct nlattr *attr;
 998         struct nft_table *table;
 999         struct nft_ctx ctx;
1000         u32 flags = 0;
1001         int err;
1002
1003         lockdep_assert_held(&net->nft.commit_mutex);
1004         attr = nla[NFTA_TABLE_NAME];
1005         table = nft_table_lookup(net, attr, family, genmask);
1006         if (IS_ERR(table)) {
1007                 if (PTR_ERR(table) != -ENOENT)
1008                         return PTR_ERR(table);
1009         } else {
1010                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1011                         NL_SET_BAD_ATTR(extack, attr);
1012                         return -EEXIST;
1013                 }
1014                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1015                         return -EOPNOTSUPP;
1016
1017                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1018                 return nf_tables_updtable(&ctx);
1019         }
1020
1021         if (nla[NFTA_TABLE_FLAGS]) {
1022                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1023                 if (flags & ~NFT_TABLE_F_DORMANT)
1024                         return -EINVAL;
1025         }
1026
1027         err = -ENOMEM;
1028         table = kzalloc(sizeof(*table), GFP_KERNEL);
1029         if (table == NULL)
1030                 goto err_kzalloc;
1031
1032         table->name = nla_strdup(attr, GFP_KERNEL);
1033         if (table->name == NULL)
1034                 goto err_strdup;
1035
1036         if (nla[NFTA_TABLE_USERDATA]) {
1037                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1038                 if (table->udata == NULL)
1039                         goto err_table_udata;
1040
1041                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1042         }
1043
1044         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1045         if (err)
1046                 goto err_chain_ht;
1047
1048         INIT_LIST_HEAD(&table->chains);
1049         INIT_LIST_HEAD(&table->sets);
1050         INIT_LIST_HEAD(&table->objects);
1051         INIT_LIST_HEAD(&table->flowtables);
1052         table->family = family;
1053         table->flags = flags;
1054         table->handle = ++table_handle;
1055
1056         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1057         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1058         if (err < 0)
1059                 goto err_trans;
1060
1061         list_add_tail_rcu(&table->list, &net->nft.tables);
1062         return 0;
1063 err_trans:
1064         rhltable_destroy(&table->chains_ht);
1065 err_chain_ht:
1066         kfree(table->udata);
1067 err_table_udata:
1068         kfree(table->name);
1069 err_strdup:
1070         kfree(table);
1071 err_kzalloc:
1072         return err;
1073 }
1074
1075 static int nft_flush_table(struct nft_ctx *ctx)
1076 {
1077         struct nft_flowtable *flowtable, *nft;
1078         struct nft_chain *chain, *nc;
1079         struct nft_object *obj, *ne;
1080         struct nft_set *set, *ns;
1081         int err;
1082
1083         list_for_each_entry(chain, &ctx->table->chains, list) {
1084                 if (!nft_is_active_next(ctx->net, chain))
1085                         continue;
1086
1087                 if (nft_chain_is_bound(chain))
1088                         continue;
1089
1090                 ctx->chain = chain;
1091
1092                 err = nft_delrule_by_chain(ctx);
1093                 if (err < 0)
1094                         goto out;
1095         }
1096
1097         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1098                 if (!nft_is_active_next(ctx->net, set))
1099                         continue;
1100
1101                 if (nft_set_is_anonymous(set) &&
1102                     !list_empty(&set->bindings))
1103                         continue;
1104
1105                 err = nft_delset(ctx, set);
1106                 if (err < 0)
1107                         goto out;
1108         }
1109
1110         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1111                 if (!nft_is_active_next(ctx->net, flowtable))
1112                         continue;
1113
1114                 err = nft_delflowtable(ctx, flowtable);
1115                 if (err < 0)
1116                         goto out;
1117         }
1118
1119         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1120                 if (!nft_is_active_next(ctx->net, obj))
1121                         continue;
1122
1123                 err = nft_delobj(ctx, obj);
1124                 if (err < 0)
1125                         goto out;
1126         }
1127
1128         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1129                 if (!nft_is_active_next(ctx->net, chain))
1130                         continue;
1131
1132                 if (nft_chain_is_bound(chain))
1133                         continue;
1134
1135                 ctx->chain = chain;
1136
1137                 err = nft_delchain(ctx);
1138                 if (err < 0)
1139                         goto out;
1140         }
1141
1142         err = nft_deltable(ctx);
1143 out:
1144         return err;
1145 }
1146
1147 static int nft_flush(struct nft_ctx *ctx, int family)
1148 {
1149         struct nft_table *table, *nt;
1150         const struct nlattr * const *nla = ctx->nla;
1151         int err = 0;
1152
1153         list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1154                 if (family != AF_UNSPEC && table->family != family)
1155                         continue;
1156
1157                 ctx->family = table->family;
1158
1159                 if (!nft_is_active_next(ctx->net, table))
1160                         continue;
1161
1162                 if (nla[NFTA_TABLE_NAME] &&
1163                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1164                         continue;
1165
1166                 ctx->table = table;
1167
1168                 err = nft_flush_table(ctx);
1169                 if (err < 0)
1170                         goto out;
1171         }
1172 out:
1173         return err;
1174 }
1175
1176 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1177                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1178                               const struct nlattr * const nla[],
1179                               struct netlink_ext_ack *extack)
1180 {
1181         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1182         u8 genmask = nft_genmask_next(net);
1183         int family = nfmsg->nfgen_family;
1184         const struct nlattr *attr;
1185         struct nft_table *table;
1186         struct nft_ctx ctx;
1187
1188         nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1189         if (family == AF_UNSPEC ||
1190             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1191                 return nft_flush(&ctx, family);
1192
1193         if (nla[NFTA_TABLE_HANDLE]) {
1194                 attr = nla[NFTA_TABLE_HANDLE];
1195                 table = nft_table_lookup_byhandle(net, attr, genmask);
1196         } else {
1197                 attr = nla[NFTA_TABLE_NAME];
1198                 table = nft_table_lookup(net, attr, family, genmask);
1199         }
1200
1201         if (IS_ERR(table)) {
1202                 NL_SET_BAD_ATTR(extack, attr);
1203                 return PTR_ERR(table);
1204         }
1205
1206         if (nlh->nlmsg_flags & NLM_F_NONREC &&
1207             table->use > 0)
1208                 return -EBUSY;
1209
1210         ctx.family = family;
1211         ctx.table = table;
1212
1213         return nft_flush_table(&ctx);
1214 }
1215
1216 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1217 {
1218         if (WARN_ON(ctx->table->use > 0))
1219                 return;
1220
1221         rhltable_destroy(&ctx->table->chains_ht);
1222         kfree(ctx->table->name);
1223         kfree(ctx->table->udata);
1224         kfree(ctx->table);
1225 }
1226
1227 void nft_register_chain_type(const struct nft_chain_type *ctype)
1228 {
1229         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1230         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1231                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1232                 return;
1233         }
1234         chain_type[ctype->family][ctype->type] = ctype;
1235         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1236 }
1237 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1238
1239 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1240 {
1241         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1242         chain_type[ctype->family][ctype->type] = NULL;
1243         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1244 }
1245 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1246
1247 /*
1248  * Chains
1249  */
1250
1251 static struct nft_chain *
1252 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1253 {
1254         struct nft_chain *chain;
1255
1256         list_for_each_entry(chain, &table->chains, list) {
1257                 if (chain->handle == handle &&
1258                     nft_active_genmask(chain, genmask))
1259                         return chain;
1260         }
1261
1262         return ERR_PTR(-ENOENT);
1263 }
1264
1265 static bool lockdep_commit_lock_is_held(const struct net *net)
1266 {
1267 #ifdef CONFIG_PROVE_LOCKING
1268         return lockdep_is_held(&net->nft.commit_mutex);
1269 #else
1270         return true;
1271 #endif
1272 }
1273
1274 static struct nft_chain *nft_chain_lookup(struct net *net,
1275                                           struct nft_table *table,
1276                                           const struct nlattr *nla, u8 genmask)
1277 {
1278         char search[NFT_CHAIN_MAXNAMELEN + 1];
1279         struct rhlist_head *tmp, *list;
1280         struct nft_chain *chain;
1281
1282         if (nla == NULL)
1283                 return ERR_PTR(-EINVAL);
1284
1285         nla_strscpy(search, nla, sizeof(search));
1286
1287         WARN_ON(!rcu_read_lock_held() &&
1288                 !lockdep_commit_lock_is_held(net));
1289
1290         chain = ERR_PTR(-ENOENT);
1291         rcu_read_lock();
1292         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1293         if (!list)
1294                 goto out_unlock;
1295
1296         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1297                 if (nft_active_genmask(chain, genmask))
1298                         goto out_unlock;
1299         }
1300         chain = ERR_PTR(-ENOENT);
1301 out_unlock:
1302         rcu_read_unlock();
1303         return chain;
1304 }
1305
1306 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1307         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1308                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1309         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1310         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1311                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1312         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1313         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1314         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1315                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1316         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1317         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1318         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1319         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1320                                     .len = NFT_USERDATA_MAXLEN },
1321 };
1322
1323 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1324         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1325         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1326         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1327                                     .len = IFNAMSIZ - 1 },
1328 };
1329
1330 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1331 {
1332         struct nft_stats *cpu_stats, total;
1333         struct nlattr *nest;
1334         unsigned int seq;
1335         u64 pkts, bytes;
1336         int cpu;
1337
1338         if (!stats)
1339                 return 0;
1340
1341         memset(&total, 0, sizeof(total));
1342         for_each_possible_cpu(cpu) {
1343                 cpu_stats = per_cpu_ptr(stats, cpu);
1344                 do {
1345                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1346                         pkts = cpu_stats->pkts;
1347                         bytes = cpu_stats->bytes;
1348                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1349                 total.pkts += pkts;
1350                 total.bytes += bytes;
1351         }
1352         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1353         if (nest == NULL)
1354                 goto nla_put_failure;
1355
1356         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1357                          NFTA_COUNTER_PAD) ||
1358             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1359                          NFTA_COUNTER_PAD))
1360                 goto nla_put_failure;
1361
1362         nla_nest_end(skb, nest);
1363         return 0;
1364
1365 nla_put_failure:
1366         return -ENOSPC;
1367 }
1368
1369 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1370                                    const struct nft_base_chain *basechain)
1371 {
1372         const struct nf_hook_ops *ops = &basechain->ops;
1373         struct nft_hook *hook, *first = NULL;
1374         struct nlattr *nest, *nest_devs;
1375         int n = 0;
1376
1377         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1378         if (nest == NULL)
1379                 goto nla_put_failure;
1380         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1381                 goto nla_put_failure;
1382         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1383                 goto nla_put_failure;
1384
1385         if (nft_base_chain_netdev(family, ops->hooknum)) {
1386                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1387                 list_for_each_entry(hook, &basechain->hook_list, list) {
1388                         if (!first)
1389                                 first = hook;
1390
1391                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1392                                            hook->ops.dev->name))
1393                                 goto nla_put_failure;
1394                         n++;
1395                 }
1396                 nla_nest_end(skb, nest_devs);
1397
1398                 if (n == 1 &&
1399                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1400                         goto nla_put_failure;
1401         }
1402         nla_nest_end(skb, nest);
1403
1404         return 0;
1405 nla_put_failure:
1406         return -1;
1407 }
1408
1409 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1410                                      u32 portid, u32 seq, int event, u32 flags,
1411                                      int family, const struct nft_table *table,
1412                                      const struct nft_chain *chain)
1413 {
1414         struct nlmsghdr *nlh;
1415         struct nfgenmsg *nfmsg;
1416
1417         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1418         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1419         if (nlh == NULL)
1420                 goto nla_put_failure;
1421
1422         nfmsg = nlmsg_data(nlh);
1423         nfmsg->nfgen_family     = family;
1424         nfmsg->version          = NFNETLINK_V0;
1425         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
1426
1427         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1428                 goto nla_put_failure;
1429         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1430                          NFTA_CHAIN_PAD))
1431                 goto nla_put_failure;
1432         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1433                 goto nla_put_failure;
1434
1435         if (nft_is_base_chain(chain)) {
1436                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1437                 struct nft_stats __percpu *stats;
1438
1439                 if (nft_dump_basechain_hook(skb, family, basechain))
1440                         goto nla_put_failure;
1441
1442                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1443                                  htonl(basechain->policy)))
1444                         goto nla_put_failure;
1445
1446                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1447                         goto nla_put_failure;
1448
1449                 stats = rcu_dereference_check(basechain->stats,
1450                                               lockdep_commit_lock_is_held(net));
1451                 if (nft_dump_stats(skb, stats))
1452                         goto nla_put_failure;
1453         }
1454
1455         if (chain->flags &&
1456             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1457                 goto nla_put_failure;
1458
1459         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1460                 goto nla_put_failure;
1461
1462         if (chain->udata &&
1463             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1464                 goto nla_put_failure;
1465
1466         nlmsg_end(skb, nlh);
1467         return 0;
1468
1469 nla_put_failure:
1470         nlmsg_trim(skb, nlh);
1471         return -1;
1472 }
1473
1474 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1475 {
1476         struct sk_buff *skb;
1477         int err;
1478         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1479                               ctx->table->name, ctx->table->handle,
1480                               ctx->chain->name, ctx->chain->handle);
1481
1482         audit_log_nfcfg(buf,
1483                         ctx->family,
1484                         ctx->chain->use,
1485                         event == NFT_MSG_NEWCHAIN ?
1486                                 AUDIT_NFT_OP_CHAIN_REGISTER :
1487                                 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1488                         GFP_KERNEL);
1489         kfree(buf);
1490
1491         if (!ctx->report &&
1492             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1493                 return;
1494
1495         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1496         if (skb == NULL)
1497                 goto err;
1498
1499         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1500                                         event, 0, ctx->family, ctx->table,
1501                                         ctx->chain);
1502         if (err < 0) {
1503                 kfree_skb(skb);
1504                 goto err;
1505         }
1506
1507         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1508         return;
1509 err:
1510         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1511 }
1512
1513 static int nf_tables_dump_chains(struct sk_buff *skb,
1514                                  struct netlink_callback *cb)
1515 {
1516         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1517         const struct nft_table *table;
1518         const struct nft_chain *chain;
1519         unsigned int idx = 0, s_idx = cb->args[0];
1520         struct net *net = sock_net(skb->sk);
1521         int family = nfmsg->nfgen_family;
1522
1523         rcu_read_lock();
1524         cb->seq = net->nft.base_seq;
1525
1526         list_for_each_entry_rcu(table, &net->nft.tables, list) {
1527                 if (family != NFPROTO_UNSPEC && family != table->family)
1528                         continue;
1529
1530                 list_for_each_entry_rcu(chain, &table->chains, list) {
1531                         if (idx < s_idx)
1532                                 goto cont;
1533                         if (idx > s_idx)
1534                                 memset(&cb->args[1], 0,
1535                                        sizeof(cb->args) - sizeof(cb->args[0]));
1536                         if (!nft_is_active(net, chain))
1537                                 continue;
1538                         if (nf_tables_fill_chain_info(skb, net,
1539                                                       NETLINK_CB(cb->skb).portid,
1540                                                       cb->nlh->nlmsg_seq,
1541                                                       NFT_MSG_NEWCHAIN,
1542                                                       NLM_F_MULTI,
1543                                                       table->family, table,
1544                                                       chain) < 0)
1545                                 goto done;
1546
1547                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1548 cont:
1549                         idx++;
1550                 }
1551         }
1552 done:
1553         rcu_read_unlock();
1554         cb->args[0] = idx;
1555         return skb->len;
1556 }
1557
1558 /* called with rcu_read_lock held */
1559 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1560                               struct sk_buff *skb, const struct nlmsghdr *nlh,
1561                               const struct nlattr * const nla[],
1562                               struct netlink_ext_ack *extack)
1563 {
1564         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1565         u8 genmask = nft_genmask_cur(net);
1566         const struct nft_chain *chain;
1567         struct nft_table *table;
1568         struct sk_buff *skb2;
1569         int family = nfmsg->nfgen_family;
1570         int err;
1571
1572         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1573                 struct netlink_dump_control c = {
1574                         .dump = nf_tables_dump_chains,
1575                         .module = THIS_MODULE,
1576                 };
1577
1578                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1579         }
1580
1581         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1582         if (IS_ERR(table)) {
1583                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1584                 return PTR_ERR(table);
1585         }
1586
1587         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1588         if (IS_ERR(chain)) {
1589                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1590                 return PTR_ERR(chain);
1591         }
1592
1593         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1594         if (!skb2)
1595                 return -ENOMEM;
1596
1597         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1598                                         nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1599                                         family, table, chain);
1600         if (err < 0)
1601                 goto err_fill_chain_info;
1602
1603         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1604
1605 err_fill_chain_info:
1606         kfree_skb(skb2);
1607         return err;
1608 }
1609
1610 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1611         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1612         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1613 };
1614
1615 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1616 {
1617         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1618         struct nft_stats __percpu *newstats;
1619         struct nft_stats *stats;
1620         int err;
1621
1622         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1623                                           nft_counter_policy, NULL);
1624         if (err < 0)
1625                 return ERR_PTR(err);
1626
1627         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1628                 return ERR_PTR(-EINVAL);
1629
1630         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1631         if (newstats == NULL)
1632                 return ERR_PTR(-ENOMEM);
1633
1634         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1635          * are not exposed to userspace.
1636          */
1637         preempt_disable();
1638         stats = this_cpu_ptr(newstats);
1639         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1640         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1641         preempt_enable();
1642
1643         return newstats;
1644 }
1645
1646 static void nft_chain_stats_replace(struct nft_trans *trans)
1647 {
1648         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1649
1650         if (!nft_trans_chain_stats(trans))
1651                 return;
1652
1653         nft_trans_chain_stats(trans) =
1654                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1655                                     lockdep_commit_lock_is_held(trans->ctx.net));
1656
1657         if (!nft_trans_chain_stats(trans))
1658                 static_branch_inc(&nft_counters_enabled);
1659 }
1660
1661 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1662 {
1663         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1664         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1665
1666         if (g0 != g1)
1667                 kvfree(g1);
1668         kvfree(g0);
1669
1670         /* should be NULL either via abort or via successful commit */
1671         WARN_ON_ONCE(chain->rules_next);
1672         kvfree(chain->rules_next);
1673 }
1674
1675 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1676 {
1677         struct nft_chain *chain = ctx->chain;
1678         struct nft_hook *hook, *next;
1679
1680         if (WARN_ON(chain->use > 0))
1681                 return;
1682
1683         /* no concurrent access possible anymore */
1684         nf_tables_chain_free_chain_rules(chain);
1685
1686         if (nft_is_base_chain(chain)) {
1687                 struct nft_base_chain *basechain = nft_base_chain(chain);
1688
1689                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1690                         list_for_each_entry_safe(hook, next,
1691                                                  &basechain->hook_list, list) {
1692                                 list_del_rcu(&hook->list);
1693                                 kfree_rcu(hook, rcu);
1694                         }
1695                 }
1696                 module_put(basechain->type->owner);
1697                 if (rcu_access_pointer(basechain->stats)) {
1698                         static_branch_dec(&nft_counters_enabled);
1699                         free_percpu(rcu_dereference_raw(basechain->stats));
1700                 }
1701                 kfree(chain->name);
1702                 kfree(chain->udata);
1703                 kfree(basechain);
1704         } else {
1705                 kfree(chain->name);
1706                 kfree(chain->udata);
1707                 kfree(chain);
1708         }
1709 }
1710
1711 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1712                                               const struct nlattr *attr)
1713 {
1714         struct net_device *dev;
1715         char ifname[IFNAMSIZ];
1716         struct nft_hook *hook;
1717         int err;
1718
1719         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1720         if (!hook) {
1721                 err = -ENOMEM;
1722                 goto err_hook_alloc;
1723         }
1724
1725         nla_strscpy(ifname, attr, IFNAMSIZ);
1726         dev = __dev_get_by_name(net, ifname);
1727         if (!dev) {
1728                 err = -ENOENT;
1729                 goto err_hook_dev;
1730         }
1731         hook->ops.dev = dev;
1732         hook->inactive = false;
1733
1734         return hook;
1735
1736 err_hook_dev:
1737         kfree(hook);
1738 err_hook_alloc:
1739         return ERR_PTR(err);
1740 }
1741
1742 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1743                                            const struct nft_hook *this)
1744 {
1745         struct nft_hook *hook;
1746
1747         list_for_each_entry(hook, hook_list, list) {
1748                 if (this->ops.dev == hook->ops.dev)
1749                         return hook;
1750         }
1751
1752         return NULL;
1753 }
1754
1755 static int nf_tables_parse_netdev_hooks(struct net *net,
1756                                         const struct nlattr *attr,
1757                                         struct list_head *hook_list)
1758 {
1759         struct nft_hook *hook, *next;
1760         const struct nlattr *tmp;
1761         int rem, n = 0, err;
1762
1763         nla_for_each_nested(tmp, attr, rem) {
1764                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1765                         err = -EINVAL;
1766                         goto err_hook;
1767                 }
1768
1769                 hook = nft_netdev_hook_alloc(net, tmp);
1770                 if (IS_ERR(hook)) {
1771                         err = PTR_ERR(hook);
1772                         goto err_hook;
1773                 }
1774                 if (nft_hook_list_find(hook_list, hook)) {
1775                         kfree(hook);
1776                         err = -EEXIST;
1777                         goto err_hook;
1778                 }
1779                 list_add_tail(&hook->list, hook_list);
1780                 n++;
1781
1782                 if (n == NFT_NETDEVICE_MAX) {
1783                         err = -EFBIG;
1784                         goto err_hook;
1785                 }
1786         }
1787
1788         return 0;
1789
1790 err_hook:
1791         list_for_each_entry_safe(hook, next, hook_list, list) {
1792                 list_del(&hook->list);
1793                 kfree(hook);
1794         }
1795         return err;
1796 }
1797
1798 struct nft_chain_hook {
1799         u32                             num;
1800         s32                             priority;
1801         const struct nft_chain_type     *type;
1802         struct list_head                list;
1803 };
1804
1805 static int nft_chain_parse_netdev(struct net *net,
1806                                   struct nlattr *tb[],
1807                                   struct list_head *hook_list)
1808 {
1809         struct nft_hook *hook;
1810         int err;
1811
1812         if (tb[NFTA_HOOK_DEV]) {
1813                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1814                 if (IS_ERR(hook))
1815                         return PTR_ERR(hook);
1816
1817                 list_add_tail(&hook->list, hook_list);
1818         } else if (tb[NFTA_HOOK_DEVS]) {
1819                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1820                                                    hook_list);
1821                 if (err < 0)
1822                         return err;
1823
1824                 if (list_empty(hook_list))
1825                         return -EINVAL;
1826         } else {
1827                 return -EINVAL;
1828         }
1829
1830         return 0;
1831 }
1832
1833 static int nft_chain_parse_hook(struct net *net,
1834                                 const struct nlattr * const nla[],
1835                                 struct nft_chain_hook *hook, u8 family,
1836                                 bool autoload)
1837 {
1838         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1839         const struct nft_chain_type *type;
1840         int err;
1841
1842         lockdep_assert_held(&net->nft.commit_mutex);
1843         lockdep_nfnl_nft_mutex_not_held();
1844
1845         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1846                                           nla[NFTA_CHAIN_HOOK],
1847                                           nft_hook_policy, NULL);
1848         if (err < 0)
1849                 return err;
1850
1851         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1852             ha[NFTA_HOOK_PRIORITY] == NULL)
1853                 return -EINVAL;
1854
1855         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1856         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1857
1858         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1859         if (!type)
1860                 return -EOPNOTSUPP;
1861
1862         if (nla[NFTA_CHAIN_TYPE]) {
1863                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1864                                                    family, autoload);
1865                 if (IS_ERR(type))
1866                         return PTR_ERR(type);
1867         }
1868         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1869                 return -EOPNOTSUPP;
1870
1871         if (type->type == NFT_CHAIN_T_NAT &&
1872             hook->priority <= NF_IP_PRI_CONNTRACK)
1873                 return -EOPNOTSUPP;
1874
1875         if (!try_module_get(type->owner))
1876                 return -ENOENT;
1877
1878         hook->type = type;
1879
1880         INIT_LIST_HEAD(&hook->list);
1881         if (nft_base_chain_netdev(family, hook->num)) {
1882                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1883                 if (err < 0) {
1884                         module_put(type->owner);
1885                         return err;
1886                 }
1887         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1888                 module_put(type->owner);
1889                 return -EOPNOTSUPP;
1890         }
1891
1892         return 0;
1893 }
1894
1895 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1896 {
1897         struct nft_hook *h, *next;
1898
1899         list_for_each_entry_safe(h, next, &hook->list, list) {
1900                 list_del(&h->list);
1901                 kfree(h);
1902         }
1903         module_put(hook->type->owner);
1904 }
1905
1906 struct nft_rules_old {
1907         struct rcu_head h;
1908         struct nft_rule **start;
1909 };
1910
1911 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1912                                                      unsigned int alloc)
1913 {
1914         if (alloc > INT_MAX)
1915                 return NULL;
1916
1917         alloc += 1;     /* NULL, ends rules */
1918         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1919                 return NULL;
1920
1921         alloc *= sizeof(struct nft_rule *);
1922         alloc += sizeof(struct nft_rules_old);
1923
1924         return kvmalloc(alloc, GFP_KERNEL);
1925 }
1926
1927 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1928                                     const struct nft_chain_hook *hook,
1929                                     struct nft_chain *chain)
1930 {
1931         ops->pf         = family;
1932         ops->hooknum    = hook->num;
1933         ops->priority   = hook->priority;
1934         ops->priv       = chain;
1935         ops->hook       = hook->type->hooks[ops->hooknum];
1936 }
1937
1938 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1939                               struct nft_chain_hook *hook, u32 flags)
1940 {
1941         struct nft_chain *chain;
1942         struct nft_hook *h;
1943
1944         basechain->type = hook->type;
1945         INIT_LIST_HEAD(&basechain->hook_list);
1946         chain = &basechain->chain;
1947
1948         if (nft_base_chain_netdev(family, hook->num)) {
1949                 list_splice_init(&hook->list, &basechain->hook_list);
1950                 list_for_each_entry(h, &basechain->hook_list, list)
1951                         nft_basechain_hook_init(&h->ops, family, hook, chain);
1952
1953                 basechain->ops.hooknum  = hook->num;
1954                 basechain->ops.priority = hook->priority;
1955         } else {
1956                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1957         }
1958
1959         chain->flags |= NFT_CHAIN_BASE | flags;
1960         basechain->policy = NF_ACCEPT;
1961         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1962             nft_chain_offload_priority(basechain) < 0)
1963                 return -EOPNOTSUPP;
1964
1965         flow_block_init(&basechain->flow_block);
1966
1967         return 0;
1968 }
1969
1970 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1971 {
1972         int err;
1973
1974         err = rhltable_insert_key(&table->chains_ht, chain->name,
1975                                   &chain->rhlhead, nft_chain_ht_params);
1976         if (err)
1977                 return err;
1978
1979         list_add_tail_rcu(&chain->list, &table->chains);
1980
1981         return 0;
1982 }
1983
1984 static u64 chain_id;
1985
1986 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1987                               u8 policy, u32 flags)
1988 {
1989         const struct nlattr * const *nla = ctx->nla;
1990         struct nft_table *table = ctx->table;
1991         struct nft_base_chain *basechain;
1992         struct nft_stats __percpu *stats;
1993         struct net *net = ctx->net;
1994         char name[NFT_NAME_MAXLEN];
1995         struct nft_trans *trans;
1996         struct nft_chain *chain;
1997         struct nft_rule **rules;
1998         int err;
1999
2000         if (table->use == UINT_MAX)
2001                 return -EOVERFLOW;
2002
2003         if (nla[NFTA_CHAIN_HOOK]) {
2004                 struct nft_chain_hook hook;
2005
2006                 if (flags & NFT_CHAIN_BINDING)
2007                         return -EOPNOTSUPP;
2008
2009                 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2010                 if (err < 0)
2011                         return err;
2012
2013                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2014                 if (basechain == NULL) {
2015                         nft_chain_release_hook(&hook);
2016                         return -ENOMEM;
2017                 }
2018                 chain = &basechain->chain;
2019
2020                 if (nla[NFTA_CHAIN_COUNTERS]) {
2021                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2022                         if (IS_ERR(stats)) {
2023                                 nft_chain_release_hook(&hook);
2024                                 kfree(basechain);
2025                                 return PTR_ERR(stats);
2026                         }
2027                         rcu_assign_pointer(basechain->stats, stats);
2028                         static_branch_inc(&nft_counters_enabled);
2029                 }
2030
2031                 err = nft_basechain_init(basechain, family, &hook, flags);
2032                 if (err < 0) {
2033                         nft_chain_release_hook(&hook);
2034                         kfree(basechain);
2035                         return err;
2036                 }
2037         } else {
2038                 if (flags & NFT_CHAIN_BASE)
2039                         return -EINVAL;
2040                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2041                         return -EOPNOTSUPP;
2042
2043                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2044                 if (chain == NULL)
2045                         return -ENOMEM;
2046
2047                 chain->flags = flags;
2048         }
2049         ctx->chain = chain;
2050
2051         INIT_LIST_HEAD(&chain->rules);
2052         chain->handle = nf_tables_alloc_handle(table);
2053         chain->table = table;
2054
2055         if (nla[NFTA_CHAIN_NAME]) {
2056                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2057         } else {
2058                 if (!(flags & NFT_CHAIN_BINDING)) {
2059                         err = -EINVAL;
2060                         goto err_destroy_chain;
2061                 }
2062
2063                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2064                 chain->name = kstrdup(name, GFP_KERNEL);
2065         }
2066
2067         if (!chain->name) {
2068                 err = -ENOMEM;
2069                 goto err_destroy_chain;
2070         }
2071
2072         if (nla[NFTA_CHAIN_USERDATA]) {
2073                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2074                 if (chain->udata == NULL) {
2075                         err = -ENOMEM;
2076                         goto err_destroy_chain;
2077                 }
2078                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2079         }
2080
2081         rules = nf_tables_chain_alloc_rules(chain, 0);
2082         if (!rules) {
2083                 err = -ENOMEM;
2084                 goto err_destroy_chain;
2085         }
2086
2087         *rules = NULL;
2088         rcu_assign_pointer(chain->rules_gen_0, rules);
2089         rcu_assign_pointer(chain->rules_gen_1, rules);
2090
2091         err = nf_tables_register_hook(net, table, chain);
2092         if (err < 0)
2093                 goto err_destroy_chain;
2094
2095         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2096         if (IS_ERR(trans)) {
2097                 err = PTR_ERR(trans);
2098                 goto err_unregister_hook;
2099         }
2100
2101         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2102         if (nft_is_base_chain(chain))
2103                 nft_trans_chain_policy(trans) = policy;
2104
2105         err = nft_chain_add(table, chain);
2106         if (err < 0) {
2107                 nft_trans_destroy(trans);
2108                 goto err_unregister_hook;
2109         }
2110
2111         table->use++;
2112
2113         return 0;
2114 err_unregister_hook:
2115         nf_tables_unregister_hook(net, table, chain);
2116 err_destroy_chain:
2117         nf_tables_chain_destroy(ctx);
2118
2119         return err;
2120 }
2121
2122 static bool nft_hook_list_equal(struct list_head *hook_list1,
2123                                 struct list_head *hook_list2)
2124 {
2125         struct nft_hook *hook;
2126         int n = 0, m = 0;
2127
2128         n = 0;
2129         list_for_each_entry(hook, hook_list2, list) {
2130                 if (!nft_hook_list_find(hook_list1, hook))
2131                         return false;
2132
2133                 n++;
2134         }
2135         list_for_each_entry(hook, hook_list1, list)
2136                 m++;
2137
2138         return n == m;
2139 }
2140
2141 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2142                               u32 flags, const struct nlattr *attr,
2143                               struct netlink_ext_ack *extack)
2144 {
2145         const struct nlattr * const *nla = ctx->nla;
2146         struct nft_table *table = ctx->table;
2147         struct nft_chain *chain = ctx->chain;
2148         struct nft_base_chain *basechain;
2149         struct nft_stats *stats = NULL;
2150         struct nft_chain_hook hook;
2151         struct nf_hook_ops *ops;
2152         struct nft_trans *trans;
2153         int err;
2154
2155         if (chain->flags ^ flags)
2156                 return -EOPNOTSUPP;
2157
2158         if (nla[NFTA_CHAIN_HOOK]) {
2159                 if (!nft_is_base_chain(chain)) {
2160                         NL_SET_BAD_ATTR(extack, attr);
2161                         return -EEXIST;
2162                 }
2163                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2164                                            false);
2165                 if (err < 0)
2166                         return err;
2167
2168                 basechain = nft_base_chain(chain);
2169                 if (basechain->type != hook.type) {
2170                         nft_chain_release_hook(&hook);
2171                         NL_SET_BAD_ATTR(extack, attr);
2172                         return -EEXIST;
2173                 }
2174
2175                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2176                         if (!nft_hook_list_equal(&basechain->hook_list,
2177                                                  &hook.list)) {
2178                                 nft_chain_release_hook(&hook);
2179                                 NL_SET_BAD_ATTR(extack, attr);
2180                                 return -EEXIST;
2181                         }
2182                 } else {
2183                         ops = &basechain->ops;
2184                         if (ops->hooknum != hook.num ||
2185                             ops->priority != hook.priority) {
2186                                 nft_chain_release_hook(&hook);
2187                                 NL_SET_BAD_ATTR(extack, attr);
2188                                 return -EEXIST;
2189                         }
2190                 }
2191                 nft_chain_release_hook(&hook);
2192         }
2193
2194         if (nla[NFTA_CHAIN_HANDLE] &&
2195             nla[NFTA_CHAIN_NAME]) {
2196                 struct nft_chain *chain2;
2197
2198                 chain2 = nft_chain_lookup(ctx->net, table,
2199                                           nla[NFTA_CHAIN_NAME], genmask);
2200                 if (!IS_ERR(chain2)) {
2201                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2202                         return -EEXIST;
2203                 }
2204         }
2205
2206         if (nla[NFTA_CHAIN_COUNTERS]) {
2207                 if (!nft_is_base_chain(chain))
2208                         return -EOPNOTSUPP;
2209
2210                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2211                 if (IS_ERR(stats))
2212                         return PTR_ERR(stats);
2213         }
2214
2215         err = -ENOMEM;
2216         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2217                                 sizeof(struct nft_trans_chain));
2218         if (trans == NULL)
2219                 goto err;
2220
2221         nft_trans_chain_stats(trans) = stats;
2222         nft_trans_chain_update(trans) = true;
2223
2224         if (nla[NFTA_CHAIN_POLICY])
2225                 nft_trans_chain_policy(trans) = policy;
2226         else
2227                 nft_trans_chain_policy(trans) = -1;
2228
2229         if (nla[NFTA_CHAIN_HANDLE] &&
2230             nla[NFTA_CHAIN_NAME]) {
2231                 struct nft_trans *tmp;
2232                 char *name;
2233
2234                 err = -ENOMEM;
2235                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2236                 if (!name)
2237                         goto err;
2238
2239                 err = -EEXIST;
2240                 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2241                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2242                             tmp->ctx.table == table &&
2243                             nft_trans_chain_update(tmp) &&
2244                             nft_trans_chain_name(tmp) &&
2245                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2246                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2247                                 kfree(name);
2248                                 goto err;
2249                         }
2250                 }
2251
2252                 nft_trans_chain_name(trans) = name;
2253         }
2254         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2255
2256         return 0;
2257 err:
2258         free_percpu(stats);
2259         kfree(trans);
2260         return err;
2261 }
2262
2263 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2264                                                const struct nlattr *nla)
2265 {
2266         u32 id = ntohl(nla_get_be32(nla));
2267         struct nft_trans *trans;
2268
2269         list_for_each_entry(trans, &net->nft.commit_list, list) {
2270                 struct nft_chain *chain = trans->ctx.chain;
2271
2272                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2273                     id == nft_trans_chain_id(trans))
2274                         return chain;
2275         }
2276         return ERR_PTR(-ENOENT);
2277 }
2278
2279 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2280                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2281                               const struct nlattr * const nla[],
2282                               struct netlink_ext_ack *extack)
2283 {
2284         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2285         u8 genmask = nft_genmask_next(net);
2286         int family = nfmsg->nfgen_family;
2287         struct nft_chain *chain = NULL;
2288         const struct nlattr *attr;
2289         struct nft_table *table;
2290         u8 policy = NF_ACCEPT;
2291         struct nft_ctx ctx;
2292         u64 handle = 0;
2293         u32 flags = 0;
2294
2295         lockdep_assert_held(&net->nft.commit_mutex);
2296
2297         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2298         if (IS_ERR(table)) {
2299                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2300                 return PTR_ERR(table);
2301         }
2302
2303         chain = NULL;
2304         attr = nla[NFTA_CHAIN_NAME];
2305
2306         if (nla[NFTA_CHAIN_HANDLE]) {
2307                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2308                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2309                 if (IS_ERR(chain)) {
2310                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2311                         return PTR_ERR(chain);
2312                 }
2313                 attr = nla[NFTA_CHAIN_HANDLE];
2314         } else if (nla[NFTA_CHAIN_NAME]) {
2315                 chain = nft_chain_lookup(net, table, attr, genmask);
2316                 if (IS_ERR(chain)) {
2317                         if (PTR_ERR(chain) != -ENOENT) {
2318                                 NL_SET_BAD_ATTR(extack, attr);
2319                                 return PTR_ERR(chain);
2320                         }
2321                         chain = NULL;
2322                 }
2323         } else if (!nla[NFTA_CHAIN_ID]) {
2324                 return -EINVAL;
2325         }
2326
2327         if (nla[NFTA_CHAIN_POLICY]) {
2328                 if (chain != NULL &&
2329                     !nft_is_base_chain(chain)) {
2330                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2331                         return -EOPNOTSUPP;
2332                 }
2333
2334                 if (chain == NULL &&
2335                     nla[NFTA_CHAIN_HOOK] == NULL) {
2336                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2337                         return -EOPNOTSUPP;
2338                 }
2339
2340                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2341                 switch (policy) {
2342                 case NF_DROP:
2343                 case NF_ACCEPT:
2344                         break;
2345                 default:
2346                         return -EINVAL;
2347                 }
2348         }
2349
2350         if (nla[NFTA_CHAIN_FLAGS])
2351                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2352         else if (chain)
2353                 flags = chain->flags;
2354
2355         if (flags & ~NFT_CHAIN_FLAGS)
2356                 return -EOPNOTSUPP;
2357
2358         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2359
2360         if (chain != NULL) {
2361                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2362                         NL_SET_BAD_ATTR(extack, attr);
2363                         return -EEXIST;
2364                 }
2365                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2366                         return -EOPNOTSUPP;
2367
2368                 flags |= chain->flags & NFT_CHAIN_BASE;
2369                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2370                                           extack);
2371         }
2372
2373         return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2374 }
2375
2376 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2377                               struct sk_buff *skb, const struct nlmsghdr *nlh,
2378                               const struct nlattr * const nla[],
2379                               struct netlink_ext_ack *extack)
2380 {
2381         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2382         u8 genmask = nft_genmask_next(net);
2383         int family = nfmsg->nfgen_family;
2384         const struct nlattr *attr;
2385         struct nft_table *table;
2386         struct nft_chain *chain;
2387         struct nft_rule *rule;
2388         struct nft_ctx ctx;
2389         u64 handle;
2390         u32 use;
2391         int err;
2392
2393         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2394         if (IS_ERR(table)) {
2395                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2396                 return PTR_ERR(table);
2397         }
2398
2399         if (nla[NFTA_CHAIN_HANDLE]) {
2400                 attr = nla[NFTA_CHAIN_HANDLE];
2401                 handle = be64_to_cpu(nla_get_be64(attr));
2402                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2403         } else {
2404                 attr = nla[NFTA_CHAIN_NAME];
2405                 chain = nft_chain_lookup(net, table, attr, genmask);
2406         }
2407         if (IS_ERR(chain)) {
2408                 NL_SET_BAD_ATTR(extack, attr);
2409                 return PTR_ERR(chain);
2410         }
2411
2412         if (nlh->nlmsg_flags & NLM_F_NONREC &&
2413             chain->use > 0)
2414                 return -EBUSY;
2415
2416         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2417
2418         use = chain->use;
2419         list_for_each_entry(rule, &chain->rules, list) {
2420                 if (!nft_is_active_next(net, rule))
2421                         continue;
2422                 use--;
2423
2424                 err = nft_delrule(&ctx, rule);
2425                 if (err < 0)
2426                         return err;
2427         }
2428
2429         /* There are rules and elements that are still holding references to us,
2430          * we cannot do a recursive removal in this case.
2431          */
2432         if (use > 0) {
2433                 NL_SET_BAD_ATTR(extack, attr);
2434                 return -EBUSY;
2435         }
2436
2437         return nft_delchain(&ctx);
2438 }
2439
2440 /*
2441  * Expressions
2442  */
2443
2444 /**
2445  *      nft_register_expr - register nf_tables expr type
2446  *      @type: expr type
2447  *
2448  *      Registers the expr type for use with nf_tables. Returns zero on
2449  *      success or a negative errno code otherwise.
2450  */
2451 int nft_register_expr(struct nft_expr_type *type)
2452 {
2453         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2454         if (type->family == NFPROTO_UNSPEC)
2455                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2456         else
2457                 list_add_rcu(&type->list, &nf_tables_expressions);
2458         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2459         return 0;
2460 }
2461 EXPORT_SYMBOL_GPL(nft_register_expr);
2462
2463 /**
2464  *      nft_unregister_expr - unregister nf_tables expr type
2465  *      @type: expr type
2466  *
2467  *      Unregisters the expr typefor use with nf_tables.
2468  */
2469 void nft_unregister_expr(struct nft_expr_type *type)
2470 {
2471         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2472         list_del_rcu(&type->list);
2473         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2474 }
2475 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2476
2477 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2478                                                        struct nlattr *nla)
2479 {
2480         const struct nft_expr_type *type, *candidate = NULL;
2481
2482         list_for_each_entry(type, &nf_tables_expressions, list) {
2483                 if (!nla_strcmp(nla, type->name)) {
2484                         if (!type->family && !candidate)
2485                                 candidate = type;
2486                         else if (type->family == family)
2487                                 candidate = type;
2488                 }
2489         }
2490         return candidate;
2491 }
2492
2493 #ifdef CONFIG_MODULES
2494 static int nft_expr_type_request_module(struct net *net, u8 family,
2495                                         struct nlattr *nla)
2496 {
2497         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2498                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2499                 return -EAGAIN;
2500
2501         return 0;
2502 }
2503 #endif
2504
2505 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2506                                                      u8 family,
2507                                                      struct nlattr *nla)
2508 {
2509         const struct nft_expr_type *type;
2510
2511         if (nla == NULL)
2512                 return ERR_PTR(-EINVAL);
2513
2514         type = __nft_expr_type_get(family, nla);
2515         if (type != NULL && try_module_get(type->owner))
2516                 return type;
2517
2518         lockdep_nfnl_nft_mutex_not_held();
2519 #ifdef CONFIG_MODULES
2520         if (type == NULL) {
2521                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2522                         return ERR_PTR(-EAGAIN);
2523
2524                 if (nft_request_module(net, "nft-expr-%.*s",
2525                                        nla_len(nla),
2526                                        (char *)nla_data(nla)) == -EAGAIN)
2527                         return ERR_PTR(-EAGAIN);
2528         }
2529 #endif
2530         return ERR_PTR(-ENOENT);
2531 }
2532
2533 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2534         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2535                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2536         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2537 };
2538
2539 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2540                                     const struct nft_expr *expr)
2541 {
2542         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2543                 goto nla_put_failure;
2544
2545         if (expr->ops->dump) {
2546                 struct nlattr *data = nla_nest_start_noflag(skb,
2547                                                             NFTA_EXPR_DATA);
2548                 if (data == NULL)
2549                         goto nla_put_failure;
2550                 if (expr->ops->dump(skb, expr) < 0)
2551                         goto nla_put_failure;
2552                 nla_nest_end(skb, data);
2553         }
2554
2555         return skb->len;
2556
2557 nla_put_failure:
2558         return -1;
2559 };
2560
2561 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2562                   const struct nft_expr *expr)
2563 {
2564         struct nlattr *nest;
2565
2566         nest = nla_nest_start_noflag(skb, attr);
2567         if (!nest)
2568                 goto nla_put_failure;
2569         if (nf_tables_fill_expr_info(skb, expr) < 0)
2570                 goto nla_put_failure;
2571         nla_nest_end(skb, nest);
2572         return 0;
2573
2574 nla_put_failure:
2575         return -1;
2576 }
2577
2578 struct nft_expr_info {
2579         const struct nft_expr_ops       *ops;
2580         const struct nlattr             *attr;
2581         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2582 };
2583
2584 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2585                                 const struct nlattr *nla,
2586                                 struct nft_expr_info *info)
2587 {
2588         const struct nft_expr_type *type;
2589         const struct nft_expr_ops *ops;
2590         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2591         int err;
2592
2593         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2594                                           nft_expr_policy, NULL);
2595         if (err < 0)
2596                 return err;
2597
2598         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2599         if (IS_ERR(type))
2600                 return PTR_ERR(type);
2601
2602         if (tb[NFTA_EXPR_DATA]) {
2603                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2604                                                   tb[NFTA_EXPR_DATA],
2605                                                   type->policy, NULL);
2606                 if (err < 0)
2607                         goto err1;
2608         } else
2609                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2610
2611         if (type->select_ops != NULL) {
2612                 ops = type->select_ops(ctx,
2613                                        (const struct nlattr * const *)info->tb);
2614                 if (IS_ERR(ops)) {
2615                         err = PTR_ERR(ops);
2616 #ifdef CONFIG_MODULES
2617                         if (err == -EAGAIN)
2618                                 if (nft_expr_type_request_module(ctx->net,
2619                                                                  ctx->family,
2620                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2621                                         err = -ENOENT;
2622 #endif
2623                         goto err1;
2624                 }
2625         } else
2626                 ops = type->ops;
2627
2628         info->attr = nla;
2629         info->ops = ops;
2630
2631         return 0;
2632
2633 err1:
2634         module_put(type->owner);
2635         return err;
2636 }
2637
2638 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2639                              const struct nft_expr_info *info,
2640                              struct nft_expr *expr)
2641 {
2642         const struct nft_expr_ops *ops = info->ops;
2643         int err;
2644
2645         expr->ops = ops;
2646         if (ops->init) {
2647                 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2648                 if (err < 0)
2649                         goto err1;
2650         }
2651
2652         return 0;
2653 err1:
2654         expr->ops = NULL;
2655         return err;
2656 }
2657
2658 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2659                                    struct nft_expr *expr)
2660 {
2661         const struct nft_expr_type *type = expr->ops->type;
2662
2663         if (expr->ops->destroy)
2664                 expr->ops->destroy(ctx, expr);
2665         module_put(type->owner);
2666 }
2667
2668 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2669                                       const struct nlattr *nla)
2670 {
2671         struct nft_expr_info info;
2672         struct nft_expr *expr;
2673         struct module *owner;
2674         int err;
2675
2676         err = nf_tables_expr_parse(ctx, nla, &info);
2677         if (err < 0)
2678                 goto err1;
2679
2680         err = -ENOMEM;
2681         expr = kzalloc(info.ops->size, GFP_KERNEL);
2682         if (expr == NULL)
2683                 goto err2;
2684
2685         err = nf_tables_newexpr(ctx, &info, expr);
2686         if (err < 0)
2687                 goto err3;
2688
2689         return expr;
2690 err3:
2691         kfree(expr);
2692 err2:
2693         owner = info.ops->type->owner;
2694         if (info.ops->type->release_ops)
2695                 info.ops->type->release_ops(info.ops);
2696
2697         module_put(owner);
2698 err1:
2699         return ERR_PTR(err);
2700 }
2701
2702 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2703 {
2704         int err;
2705
2706         if (src->ops->clone) {
2707                 dst->ops = src->ops;
2708                 err = src->ops->clone(dst, src);
2709                 if (err < 0)
2710                         return err;
2711         } else {
2712                 memcpy(dst, src, src->ops->size);
2713         }
2714
2715         __module_get(src->ops->type->owner);
2716
2717         return 0;
2718 }
2719
2720 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2721 {
2722         nf_tables_expr_destroy(ctx, expr);
2723         kfree(expr);
2724 }
2725
2726 /*
2727  * Rules
2728  */
2729
2730 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2731                                           u64 handle)
2732 {
2733         struct nft_rule *rule;
2734
2735         // FIXME: this sucks
2736         list_for_each_entry_rcu(rule, &chain->rules, list) {
2737                 if (handle == rule->handle)
2738                         return rule;
2739         }
2740
2741         return ERR_PTR(-ENOENT);
2742 }
2743
2744 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2745                                         const struct nlattr *nla)
2746 {
2747         if (nla == NULL)
2748                 return ERR_PTR(-EINVAL);
2749
2750         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2751 }
2752
2753 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2754         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2755                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2756         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2757                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2758         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2759         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2760         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2761         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2762         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2763                                     .len = NFT_USERDATA_MAXLEN },
2764         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2765         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2766         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2767 };
2768
2769 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2770                                     u32 portid, u32 seq, int event,
2771                                     u32 flags, int family,
2772                                     const struct nft_table *table,
2773                                     const struct nft_chain *chain,
2774                                     const struct nft_rule *rule,
2775                                     const struct nft_rule *prule)
2776 {
2777         struct nlmsghdr *nlh;
2778         struct nfgenmsg *nfmsg;
2779         const struct nft_expr *expr, *next;
2780         struct nlattr *list;
2781         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2782
2783         nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2784         if (nlh == NULL)
2785                 goto nla_put_failure;
2786
2787         nfmsg = nlmsg_data(nlh);
2788         nfmsg->nfgen_family     = family;
2789         nfmsg->version          = NFNETLINK_V0;
2790         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
2791
2792         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2793                 goto nla_put_failure;
2794         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2795                 goto nla_put_failure;
2796         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2797                          NFTA_RULE_PAD))
2798                 goto nla_put_failure;
2799
2800         if (event != NFT_MSG_DELRULE && prule) {
2801                 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2802                                  cpu_to_be64(prule->handle),
2803                                  NFTA_RULE_PAD))
2804                         goto nla_put_failure;
2805         }
2806
2807         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2808         if (list == NULL)
2809                 goto nla_put_failure;
2810         nft_rule_for_each_expr(expr, next, rule) {
2811                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2812                         goto nla_put_failure;
2813         }
2814         nla_nest_end(skb, list);
2815
2816         if (rule->udata) {
2817                 struct nft_userdata *udata = nft_userdata(rule);
2818                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2819                             udata->data) < 0)
2820                         goto nla_put_failure;
2821         }
2822
2823         nlmsg_end(skb, nlh);
2824         return 0;
2825
2826 nla_put_failure:
2827         nlmsg_trim(skb, nlh);
2828         return -1;
2829 }
2830
2831 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2832                                   const struct nft_rule *rule, int event)
2833 {
2834         struct sk_buff *skb;
2835         int err;
2836         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2837                               ctx->table->name, ctx->table->handle,
2838                               ctx->chain->name, ctx->chain->handle);
2839
2840         audit_log_nfcfg(buf,
2841                         ctx->family,
2842                         rule->handle,
2843                         event == NFT_MSG_NEWRULE ?
2844                                 AUDIT_NFT_OP_RULE_REGISTER :
2845                                 AUDIT_NFT_OP_RULE_UNREGISTER,
2846                         GFP_KERNEL);
2847         kfree(buf);
2848
2849         if (!ctx->report &&
2850             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2851                 return;
2852
2853         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2854         if (skb == NULL)
2855                 goto err;
2856
2857         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2858                                        event, 0, ctx->family, ctx->table,
2859                                        ctx->chain, rule, NULL);
2860         if (err < 0) {
2861                 kfree_skb(skb);
2862                 goto err;
2863         }
2864
2865         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2866         return;
2867 err:
2868         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2869 }
2870
2871 struct nft_rule_dump_ctx {
2872         char *table;
2873         char *chain;
2874 };
2875
2876 static int __nf_tables_dump_rules(struct sk_buff *skb,
2877                                   unsigned int *idx,
2878                                   struct netlink_callback *cb,
2879                                   const struct nft_table *table,
2880                                   const struct nft_chain *chain)
2881 {
2882         struct net *net = sock_net(skb->sk);
2883         const struct nft_rule *rule, *prule;
2884         unsigned int s_idx = cb->args[0];
2885
2886         prule = NULL;
2887         list_for_each_entry_rcu(rule, &chain->rules, list) {
2888                 if (!nft_is_active(net, rule))
2889                         goto cont_skip;
2890                 if (*idx < s_idx)
2891                         goto cont;
2892                 if (*idx > s_idx) {
2893                         memset(&cb->args[1], 0,
2894                                         sizeof(cb->args) - sizeof(cb->args[0]));
2895                 }
2896                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2897                                         cb->nlh->nlmsg_seq,
2898                                         NFT_MSG_NEWRULE,
2899                                         NLM_F_MULTI | NLM_F_APPEND,
2900                                         table->family,
2901                                         table, chain, rule, prule) < 0)
2902                         return 1;
2903
2904                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2905 cont:
2906                 prule = rule;
2907 cont_skip:
2908                 (*idx)++;
2909         }
2910         return 0;
2911 }
2912
2913 static int nf_tables_dump_rules(struct sk_buff *skb,
2914                                 struct netlink_callback *cb)
2915 {
2916         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2917         const struct nft_rule_dump_ctx *ctx = cb->data;
2918         struct nft_table *table;
2919         const struct nft_chain *chain;
2920         unsigned int idx = 0;
2921         struct net *net = sock_net(skb->sk);
2922         int family = nfmsg->nfgen_family;
2923
2924         rcu_read_lock();
2925         cb->seq = net->nft.base_seq;
2926
2927         list_for_each_entry_rcu(table, &net->nft.tables, list) {
2928                 if (family != NFPROTO_UNSPEC && family != table->family)
2929                         continue;
2930
2931                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2932                         continue;
2933
2934                 if (ctx && ctx->table && ctx->chain) {
2935                         struct rhlist_head *list, *tmp;
2936
2937                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
2938                                                nft_chain_ht_params);
2939                         if (!list)
2940                                 goto done;
2941
2942                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2943                                 if (!nft_is_active(net, chain))
2944                                         continue;
2945                                 __nf_tables_dump_rules(skb, &idx,
2946                                                        cb, table, chain);
2947                                 break;
2948                         }
2949                         goto done;
2950                 }
2951
2952                 list_for_each_entry_rcu(chain, &table->chains, list) {
2953                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2954                                 goto done;
2955                 }
2956
2957                 if (ctx && ctx->table)
2958                         break;
2959         }
2960 done:
2961         rcu_read_unlock();
2962
2963         cb->args[0] = idx;
2964         return skb->len;
2965 }
2966
2967 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2968 {
2969         const struct nlattr * const *nla = cb->data;
2970         struct nft_rule_dump_ctx *ctx = NULL;
2971
2972         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2973                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2974                 if (!ctx)
2975                         return -ENOMEM;
2976
2977                 if (nla[NFTA_RULE_TABLE]) {
2978                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2979                                                         GFP_ATOMIC);
2980                         if (!ctx->table) {
2981                                 kfree(ctx);
2982                                 return -ENOMEM;
2983                         }
2984                 }
2985                 if (nla[NFTA_RULE_CHAIN]) {
2986                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
2987                                                 GFP_ATOMIC);
2988                         if (!ctx->chain) {
2989                                 kfree(ctx->table);
2990                                 kfree(ctx);
2991                                 return -ENOMEM;
2992                         }
2993                 }
2994         }
2995
2996         cb->data = ctx;
2997         return 0;
2998 }
2999
3000 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3001 {
3002         struct nft_rule_dump_ctx *ctx = cb->data;
3003
3004         if (ctx) {
3005                 kfree(ctx->table);
3006                 kfree(ctx->chain);
3007                 kfree(ctx);
3008         }
3009         return 0;
3010 }
3011
3012 /* called with rcu_read_lock held */
3013 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3014                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3015                              const struct nlattr * const nla[],
3016                              struct netlink_ext_ack *extack)
3017 {
3018         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3019         u8 genmask = nft_genmask_cur(net);
3020         const struct nft_chain *chain;
3021         const struct nft_rule *rule;
3022         struct nft_table *table;
3023         struct sk_buff *skb2;
3024         int family = nfmsg->nfgen_family;
3025         int err;
3026
3027         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3028                 struct netlink_dump_control c = {
3029                         .start= nf_tables_dump_rules_start,
3030                         .dump = nf_tables_dump_rules,
3031                         .done = nf_tables_dump_rules_done,
3032                         .module = THIS_MODULE,
3033                         .data = (void *)nla,
3034                 };
3035
3036                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3037         }
3038
3039         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3040         if (IS_ERR(table)) {
3041                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3042                 return PTR_ERR(table);
3043         }
3044
3045         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3046         if (IS_ERR(chain)) {
3047                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3048                 return PTR_ERR(chain);
3049         }
3050
3051         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3052         if (IS_ERR(rule)) {
3053                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3054                 return PTR_ERR(rule);
3055         }
3056
3057         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3058         if (!skb2)
3059                 return -ENOMEM;
3060
3061         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3062                                        nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3063                                        family, table, chain, rule, NULL);
3064         if (err < 0)
3065                 goto err_fill_rule_info;
3066
3067         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3068
3069 err_fill_rule_info:
3070         kfree_skb(skb2);
3071         return err;
3072 }
3073
3074 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3075                                    struct nft_rule *rule)
3076 {
3077         struct nft_expr *expr, *next;
3078
3079         /*
3080          * Careful: some expressions might not be initialized in case this
3081          * is called on error from nf_tables_newrule().
3082          */
3083         expr = nft_expr_first(rule);
3084         while (nft_expr_more(rule, expr)) {
3085                 next = nft_expr_next(expr);
3086                 nf_tables_expr_destroy(ctx, expr);
3087                 expr = next;
3088         }
3089         kfree(rule);
3090 }
3091
3092 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3093 {
3094         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3095         nf_tables_rule_destroy(ctx, rule);
3096 }
3097
3098 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3099 {
3100         struct nft_expr *expr, *last;
3101         const struct nft_data *data;
3102         struct nft_rule *rule;
3103         int err;
3104
3105         if (ctx->level == NFT_JUMP_STACK_SIZE)
3106                 return -EMLINK;
3107
3108         list_for_each_entry(rule, &chain->rules, list) {
3109                 if (!nft_is_active_next(ctx->net, rule))
3110                         continue;
3111
3112                 nft_rule_for_each_expr(expr, last, rule) {
3113                         if (!expr->ops->validate)
3114                                 continue;
3115
3116                         err = expr->ops->validate(ctx, expr, &data);
3117                         if (err < 0)
3118                                 return err;
3119                 }
3120         }
3121
3122         return 0;
3123 }
3124 EXPORT_SYMBOL_GPL(nft_chain_validate);
3125
3126 static int nft_table_validate(struct net *net, const struct nft_table *table)
3127 {
3128         struct nft_chain *chain;
3129         struct nft_ctx ctx = {
3130                 .net    = net,
3131                 .family = table->family,
3132         };
3133         int err;
3134
3135         list_for_each_entry(chain, &table->chains, list) {
3136                 if (!nft_is_base_chain(chain))
3137                         continue;
3138
3139                 ctx.chain = chain;
3140                 err = nft_chain_validate(&ctx, chain);
3141                 if (err < 0)
3142                         return err;
3143         }
3144
3145         return 0;
3146 }
3147
3148 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3149                                              const struct nlattr *nla);
3150
3151 #define NFT_RULE_MAXEXPRS       128
3152
3153 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3154                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3155                              const struct nlattr * const nla[],
3156                              struct netlink_ext_ack *extack)
3157 {
3158         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3159         u8 genmask = nft_genmask_next(net);
3160         struct nft_expr_info *info = NULL;
3161         int family = nfmsg->nfgen_family;
3162         struct nft_flow_rule *flow;
3163         struct nft_table *table;
3164         struct nft_chain *chain;
3165         struct nft_rule *rule, *old_rule = NULL;
3166         struct nft_userdata *udata;
3167         struct nft_trans *trans = NULL;
3168         struct nft_expr *expr;
3169         struct nft_ctx ctx;
3170         struct nlattr *tmp;
3171         unsigned int size, i, n, ulen = 0, usize = 0;
3172         int err, rem;
3173         u64 handle, pos_handle;
3174
3175         lockdep_assert_held(&net->nft.commit_mutex);
3176
3177         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3178         if (IS_ERR(table)) {
3179                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3180                 return PTR_ERR(table);
3181         }
3182
3183         if (nla[NFTA_RULE_CHAIN]) {
3184                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3185                                          genmask);
3186                 if (IS_ERR(chain)) {
3187                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3188                         return PTR_ERR(chain);
3189                 }
3190                 if (nft_chain_is_bound(chain))
3191                         return -EOPNOTSUPP;
3192
3193         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3194                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3195                 if (IS_ERR(chain)) {
3196                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3197                         return PTR_ERR(chain);
3198                 }
3199         } else {
3200                 return -EINVAL;
3201         }
3202
3203         if (nla[NFTA_RULE_HANDLE]) {
3204                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3205                 rule = __nft_rule_lookup(chain, handle);
3206                 if (IS_ERR(rule)) {
3207                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3208                         return PTR_ERR(rule);
3209                 }
3210
3211                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3212                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3213                         return -EEXIST;
3214                 }
3215                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3216                         old_rule = rule;
3217                 else
3218                         return -EOPNOTSUPP;
3219         } else {
3220                 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3221                     nlh->nlmsg_flags & NLM_F_REPLACE)
3222                         return -EINVAL;
3223                 handle = nf_tables_alloc_handle(table);
3224
3225                 if (chain->use == UINT_MAX)
3226                         return -EOVERFLOW;
3227
3228                 if (nla[NFTA_RULE_POSITION]) {
3229                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3230                         old_rule = __nft_rule_lookup(chain, pos_handle);
3231                         if (IS_ERR(old_rule)) {
3232                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3233                                 return PTR_ERR(old_rule);
3234                         }
3235                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3236                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3237                         if (IS_ERR(old_rule)) {
3238                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3239                                 return PTR_ERR(old_rule);
3240                         }
3241                 }
3242         }
3243
3244         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3245
3246         n = 0;
3247         size = 0;
3248         if (nla[NFTA_RULE_EXPRESSIONS]) {
3249                 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3250                                       sizeof(struct nft_expr_info),
3251                                       GFP_KERNEL);
3252                 if (!info)
3253                         return -ENOMEM;
3254
3255                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3256                         err = -EINVAL;
3257                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3258                                 goto err1;
3259                         if (n == NFT_RULE_MAXEXPRS)
3260                                 goto err1;
3261                         err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3262                         if (err < 0)
3263                                 goto err1;
3264                         size += info[n].ops->size;
3265                         n++;
3266                 }
3267         }
3268         /* Check for overflow of dlen field */
3269         err = -EFBIG;
3270         if (size >= 1 << 12)
3271                 goto err1;
3272
3273         if (nla[NFTA_RULE_USERDATA]) {
3274                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3275                 if (ulen > 0)
3276                         usize = sizeof(struct nft_userdata) + ulen;
3277         }
3278
3279         err = -ENOMEM;
3280         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3281         if (rule == NULL)
3282                 goto err1;
3283
3284         nft_activate_next(net, rule);
3285
3286         rule->handle = handle;
3287         rule->dlen   = size;
3288         rule->udata  = ulen ? 1 : 0;
3289
3290         if (ulen) {
3291                 udata = nft_userdata(rule);
3292                 udata->len = ulen - 1;
3293                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3294         }
3295
3296         expr = nft_expr_first(rule);
3297         for (i = 0; i < n; i++) {
3298                 err = nf_tables_newexpr(&ctx, &info[i], expr);
3299                 if (err < 0) {
3300                         NL_SET_BAD_ATTR(extack, info[i].attr);
3301                         goto err2;
3302                 }
3303
3304                 if (info[i].ops->validate)
3305                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3306
3307                 info[i].ops = NULL;
3308                 expr = nft_expr_next(expr);
3309         }
3310
3311         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3312                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3313                 if (trans == NULL) {
3314                         err = -ENOMEM;
3315                         goto err2;
3316                 }
3317                 err = nft_delrule(&ctx, old_rule);
3318                 if (err < 0) {
3319                         nft_trans_destroy(trans);
3320                         goto err2;
3321                 }
3322
3323                 list_add_tail_rcu(&rule->list, &old_rule->list);
3324         } else {
3325                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3326                 if (!trans) {
3327                         err = -ENOMEM;
3328                         goto err2;
3329                 }
3330
3331                 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3332                         if (old_rule)
3333                                 list_add_rcu(&rule->list, &old_rule->list);
3334                         else
3335                                 list_add_tail_rcu(&rule->list, &chain->rules);
3336                  } else {
3337                         if (old_rule)
3338                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3339                         else
3340                                 list_add_rcu(&rule->list, &chain->rules);
3341                 }
3342         }
3343         kvfree(info);
3344         chain->use++;
3345
3346         if (net->nft.validate_state == NFT_VALIDATE_DO)
3347                 return nft_table_validate(net, table);
3348
3349         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3350                 flow = nft_flow_rule_create(net, rule);
3351                 if (IS_ERR(flow))
3352                         return PTR_ERR(flow);
3353
3354                 nft_trans_flow_rule(trans) = flow;
3355         }
3356
3357         return 0;
3358 err2:
3359         nf_tables_rule_release(&ctx, rule);
3360 err1:
3361         for (i = 0; i < n; i++) {
3362                 if (info[i].ops) {
3363                         module_put(info[i].ops->type->owner);
3364                         if (info[i].ops->type->release_ops)
3365                                 info[i].ops->type->release_ops(info[i].ops);
3366                 }
3367         }
3368         kvfree(info);
3369         return err;
3370 }
3371
3372 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3373                                              const struct nlattr *nla)
3374 {
3375         u32 id = ntohl(nla_get_be32(nla));
3376         struct nft_trans *trans;
3377
3378         list_for_each_entry(trans, &net->nft.commit_list, list) {
3379                 struct nft_rule *rule = nft_trans_rule(trans);
3380
3381                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3382                     id == nft_trans_rule_id(trans))
3383                         return rule;
3384         }
3385         return ERR_PTR(-ENOENT);
3386 }
3387
3388 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3389                              struct sk_buff *skb, const struct nlmsghdr *nlh,
3390                              const struct nlattr * const nla[],
3391                              struct netlink_ext_ack *extack)
3392 {
3393         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3394         u8 genmask = nft_genmask_next(net);
3395         struct nft_table *table;
3396         struct nft_chain *chain = NULL;
3397         struct nft_rule *rule;
3398         int family = nfmsg->nfgen_family, err = 0;
3399         struct nft_ctx ctx;
3400
3401         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3402         if (IS_ERR(table)) {
3403                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3404                 return PTR_ERR(table);
3405         }
3406
3407         if (nla[NFTA_RULE_CHAIN]) {
3408                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3409                                          genmask);
3410                 if (IS_ERR(chain)) {
3411                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3412                         return PTR_ERR(chain);
3413                 }
3414                 if (nft_chain_is_bound(chain))
3415                         return -EOPNOTSUPP;
3416         }
3417
3418         nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3419
3420         if (chain) {
3421                 if (nla[NFTA_RULE_HANDLE]) {
3422                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3423                         if (IS_ERR(rule)) {
3424                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3425                                 return PTR_ERR(rule);
3426                         }
3427
3428                         err = nft_delrule(&ctx, rule);
3429                 } else if (nla[NFTA_RULE_ID]) {
3430                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3431                         if (IS_ERR(rule)) {
3432                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3433                                 return PTR_ERR(rule);
3434                         }
3435
3436                         err = nft_delrule(&ctx, rule);
3437                 } else {
3438                         err = nft_delrule_by_chain(&ctx);
3439                 }
3440         } else {
3441                 list_for_each_entry(chain, &table->chains, list) {
3442                         if (!nft_is_active_next(net, chain))
3443                                 continue;
3444
3445                         ctx.chain = chain;
3446                         err = nft_delrule_by_chain(&ctx);
3447                         if (err < 0)
3448                                 break;
3449                 }
3450         }
3451
3452         return err;
3453 }
3454
3455 /*
3456  * Sets
3457  */
3458 static const struct nft_set_type *nft_set_types[] = {
3459         &nft_set_hash_fast_type,
3460         &nft_set_hash_type,
3461         &nft_set_rhash_type,
3462         &nft_set_bitmap_type,
3463         &nft_set_rbtree_type,
3464 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3465         &nft_set_pipapo_avx2_type,
3466 #endif
3467         &nft_set_pipapo_type,
3468 };
3469
3470 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3471                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3472                                  NFT_SET_EVAL)
3473
3474 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3475 {
3476         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3477 }
3478
3479 /*
3480  * Select a set implementation based on the data characteristics and the
3481  * given policy. The total memory use might not be known if no size is
3482  * given, in that case the amount of memory per element is used.
3483  */
3484 static const struct nft_set_ops *
3485 nft_select_set_ops(const struct nft_ctx *ctx,
3486                    const struct nlattr * const nla[],
3487                    const struct nft_set_desc *desc,
3488                    enum nft_set_policies policy)
3489 {
3490         const struct nft_set_ops *ops, *bops;
3491         struct nft_set_estimate est, best;
3492         const struct nft_set_type *type;
3493         u32 flags = 0;
3494         int i;
3495
3496         lockdep_assert_held(&ctx->net->nft.commit_mutex);
3497         lockdep_nfnl_nft_mutex_not_held();
3498
3499         if (nla[NFTA_SET_FLAGS] != NULL)
3500                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3501
3502         bops        = NULL;
3503         best.size   = ~0;
3504         best.lookup = ~0;
3505         best.space  = ~0;
3506
3507         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3508                 type = nft_set_types[i];
3509                 ops = &type->ops;
3510
3511                 if (!nft_set_ops_candidate(type, flags))
3512                         continue;
3513                 if (!ops->estimate(desc, flags, &est))
3514                         continue;
3515
3516                 switch (policy) {
3517                 case NFT_SET_POL_PERFORMANCE:
3518                         if (est.lookup < best.lookup)
3519                                 break;
3520                         if (est.lookup == best.lookup &&
3521                             est.space < best.space)
3522                                 break;
3523                         continue;
3524                 case NFT_SET_POL_MEMORY:
3525                         if (!desc->size) {
3526                                 if (est.space < best.space)
3527                                         break;
3528                                 if (est.space == best.space &&
3529                                     est.lookup < best.lookup)
3530                                         break;
3531                         } else if (est.size < best.size || !bops) {
3532                                 break;
3533                         }
3534                         continue;
3535                 default:
3536                         break;
3537                 }
3538
3539                 bops = ops;
3540                 best = est;
3541         }
3542
3543         if (bops != NULL)
3544                 return bops;
3545
3546         return ERR_PTR(-EOPNOTSUPP);
3547 }
3548
3549 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3550         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3551                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3552         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3553                                             .len = NFT_SET_MAXNAMELEN - 1 },
3554         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3555         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3556         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3557         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3558         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3559         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3560         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3561         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3562         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3563         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3564         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3565                                             .len  = NFT_USERDATA_MAXLEN },
3566         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3567         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3568         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3569         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3570 };
3571
3572 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3573         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3574         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3575 };
3576
3577 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3578                                      const struct sk_buff *skb,
3579                                      const struct nlmsghdr *nlh,
3580                                      const struct nlattr * const nla[],
3581                                      struct netlink_ext_ack *extack,
3582                                      u8 genmask)
3583 {
3584         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3585         int family = nfmsg->nfgen_family;
3586         struct nft_table *table = NULL;
3587
3588         if (nla[NFTA_SET_TABLE] != NULL) {
3589                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3590                                          genmask);
3591                 if (IS_ERR(table)) {
3592                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3593                         return PTR_ERR(table);
3594                 }
3595         }
3596
3597         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3598         return 0;
3599 }
3600
3601 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3602                                       const struct nlattr *nla, u8 genmask)
3603 {
3604         struct nft_set *set;
3605
3606         if (nla == NULL)
3607                 return ERR_PTR(-EINVAL);
3608
3609         list_for_each_entry_rcu(set, &table->sets, list) {
3610                 if (!nla_strcmp(nla, set->name) &&
3611                     nft_active_genmask(set, genmask))
3612                         return set;
3613         }
3614         return ERR_PTR(-ENOENT);
3615 }
3616
3617 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3618                                                const struct nlattr *nla,
3619                                                u8 genmask)
3620 {
3621         struct nft_set *set;
3622
3623         list_for_each_entry(set, &table->sets, list) {
3624                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3625                     nft_active_genmask(set, genmask))
3626                         return set;
3627         }
3628         return ERR_PTR(-ENOENT);
3629 }
3630
3631 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3632                                            const struct nlattr *nla, u8 genmask)
3633 {
3634         struct nft_trans *trans;
3635         u32 id = ntohl(nla_get_be32(nla));
3636
3637         list_for_each_entry(trans, &net->nft.commit_list, list) {
3638                 if (trans->msg_type == NFT_MSG_NEWSET) {
3639                         struct nft_set *set = nft_trans_set(trans);
3640
3641                         if (id == nft_trans_set_id(trans) &&
3642                             nft_active_genmask(set, genmask))
3643                                 return set;
3644                 }
3645         }
3646         return ERR_PTR(-ENOENT);
3647 }
3648
3649 struct nft_set *nft_set_lookup_global(const struct net *net,
3650                                       const struct nft_table *table,
3651                                       const struct nlattr *nla_set_name,
3652                                       const struct nlattr *nla_set_id,
3653                                       u8 genmask)
3654 {
3655         struct nft_set *set;
3656
3657         set = nft_set_lookup(table, nla_set_name, genmask);
3658         if (IS_ERR(set)) {
3659                 if (!nla_set_id)
3660                         return set;
3661
3662                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3663         }
3664         return set;
3665 }
3666 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3667
3668 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3669                                     const char *name)
3670 {
3671         const struct nft_set *i;
3672         const char *p;
3673         unsigned long *inuse;
3674         unsigned int n = 0, min = 0;
3675
3676         p = strchr(name, '%');
3677         if (p != NULL) {
3678                 if (p[1] != 'd' || strchr(p + 2, '%'))
3679                         return -EINVAL;
3680
3681                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3682                 if (inuse == NULL)
3683                         return -ENOMEM;
3684 cont:
3685                 list_for_each_entry(i, &ctx->table->sets, list) {
3686                         int tmp;
3687
3688                         if (!nft_is_active_next(ctx->net, set))
3689                                 continue;
3690                         if (!sscanf(i->name, name, &tmp))
3691                                 continue;
3692                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3693                                 continue;
3694
3695                         set_bit(tmp - min, inuse);
3696                 }
3697
3698                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3699                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3700                         min += BITS_PER_BYTE * PAGE_SIZE;
3701                         memset(inuse, 0, PAGE_SIZE);
3702                         goto cont;
3703                 }
3704                 free_page((unsigned long)inuse);
3705         }
3706
3707         set->name = kasprintf(GFP_KERNEL, name, min + n);
3708         if (!set->name)
3709                 return -ENOMEM;
3710
3711         list_for_each_entry(i, &ctx->table->sets, list) {
3712                 if (!nft_is_active_next(ctx->net, i))
3713                         continue;
3714                 if (!strcmp(set->name, i->name)) {
3715                         kfree(set->name);
3716                         set->name = NULL;
3717                         return -ENFILE;
3718                 }
3719         }
3720         return 0;
3721 }
3722
3723 static int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3724 {
3725         u64 ms = be64_to_cpu(nla_get_be64(nla));
3726         u64 max = (u64)(~((u64)0));
3727
3728         max = div_u64(max, NSEC_PER_MSEC);
3729         if (ms >= max)
3730                 return -ERANGE;
3731
3732         ms *= NSEC_PER_MSEC;
3733         *result = nsecs_to_jiffies64(ms);
3734         return 0;
3735 }
3736
3737 static __be64 nf_jiffies64_to_msecs(u64 input)
3738 {
3739         return cpu_to_be64(jiffies64_to_msecs(input));
3740 }
3741
3742 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3743                                      const struct nft_set *set)
3744 {
3745         struct nlattr *concat, *field;
3746         int i;
3747
3748         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3749         if (!concat)
3750                 return -ENOMEM;
3751
3752         for (i = 0; i < set->field_count; i++) {
3753                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3754                 if (!field)
3755                         return -ENOMEM;
3756
3757                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3758                                  htonl(set->field_len[i])))
3759                         return -ENOMEM;
3760
3761                 nla_nest_end(skb, field);
3762         }
3763
3764         nla_nest_end(skb, concat);
3765
3766         return 0;
3767 }
3768
3769 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3770                               const struct nft_set *set, u16 event, u16 flags)
3771 {
3772         struct nfgenmsg *nfmsg;
3773         struct nlmsghdr *nlh;
3774         u32 portid = ctx->portid;
3775         struct nlattr *nest;
3776         u32 seq = ctx->seq;
3777         int i;
3778
3779         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3780         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3781                         flags);
3782         if (nlh == NULL)
3783                 goto nla_put_failure;
3784
3785         nfmsg = nlmsg_data(nlh);
3786         nfmsg->nfgen_family     = ctx->family;
3787         nfmsg->version          = NFNETLINK_V0;
3788         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
3789
3790         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3791                 goto nla_put_failure;
3792         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3793                 goto nla_put_failure;
3794         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3795                          NFTA_SET_PAD))
3796                 goto nla_put_failure;
3797         if (set->flags != 0)
3798                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3799                         goto nla_put_failure;
3800
3801         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3802                 goto nla_put_failure;
3803         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3804                 goto nla_put_failure;
3805         if (set->flags & NFT_SET_MAP) {
3806                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3807                         goto nla_put_failure;
3808                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3809                         goto nla_put_failure;
3810         }
3811         if (set->flags & NFT_SET_OBJECT &&
3812             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3813                 goto nla_put_failure;
3814
3815         if (set->timeout &&
3816             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3817                          nf_jiffies64_to_msecs(set->timeout),
3818                          NFTA_SET_PAD))
3819                 goto nla_put_failure;
3820         if (set->gc_int &&
3821             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3822                 goto nla_put_failure;
3823
3824         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3825                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3826                         goto nla_put_failure;
3827         }
3828
3829         if (set->udata &&
3830             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3831                 goto nla_put_failure;
3832
3833         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3834         if (!nest)
3835                 goto nla_put_failure;
3836         if (set->size &&
3837             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3838                 goto nla_put_failure;
3839
3840         if (set->field_count > 1 &&
3841             nf_tables_fill_set_concat(skb, set))
3842                 goto nla_put_failure;
3843
3844         nla_nest_end(skb, nest);
3845
3846         if (set->num_exprs == 1) {
3847                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3848                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3849                         goto nla_put_failure;
3850
3851                 nla_nest_end(skb, nest);
3852         } else if (set->num_exprs > 1) {
3853                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3854                 if (nest == NULL)
3855                         goto nla_put_failure;
3856
3857                 for (i = 0; i < set->num_exprs; i++) {
3858                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3859                                           set->exprs[i]) < 0)
3860                                 goto nla_put_failure;
3861                 }
3862                 nla_nest_end(skb, nest);
3863         }
3864
3865         nlmsg_end(skb, nlh);
3866         return 0;
3867
3868 nla_put_failure:
3869         nlmsg_trim(skb, nlh);
3870         return -1;
3871 }
3872
3873 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3874                                  const struct nft_set *set, int event,
3875                                  gfp_t gfp_flags)
3876 {
3877         struct sk_buff *skb;
3878         u32 portid = ctx->portid;
3879         int err;
3880         char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3881                               ctx->table->name, ctx->table->handle,
3882                               set->name, set->handle);
3883
3884         audit_log_nfcfg(buf,
3885                         ctx->family,
3886                         set->field_count,
3887                         event == NFT_MSG_NEWSET ?
3888                                 AUDIT_NFT_OP_SET_REGISTER :
3889                                 AUDIT_NFT_OP_SET_UNREGISTER,
3890                         gfp_flags);
3891         kfree(buf);
3892
3893         if (!ctx->report &&
3894             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3895                 return;
3896
3897         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3898         if (skb == NULL)
3899                 goto err;
3900
3901         err = nf_tables_fill_set(skb, ctx, set, event, 0);
3902         if (err < 0) {
3903                 kfree_skb(skb);
3904                 goto err;
3905         }
3906
3907         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3908         return;
3909 err:
3910         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3911 }
3912
3913 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3914 {
3915         const struct nft_set *set;
3916         unsigned int idx, s_idx = cb->args[0];
3917         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3918         struct net *net = sock_net(skb->sk);
3919         struct nft_ctx *ctx = cb->data, ctx_set;
3920
3921         if (cb->args[1])
3922                 return skb->len;
3923
3924         rcu_read_lock();
3925         cb->seq = net->nft.base_seq;
3926
3927         list_for_each_entry_rcu(table, &net->nft.tables, list) {
3928                 if (ctx->family != NFPROTO_UNSPEC &&
3929                     ctx->family != table->family)
3930                         continue;
3931
3932                 if (ctx->table && ctx->table != table)
3933                         continue;
3934
3935                 if (cur_table) {
3936                         if (cur_table != table)
3937                                 continue;
3938
3939                         cur_table = NULL;
3940                 }
3941                 idx = 0;
3942                 list_for_each_entry_rcu(set, &table->sets, list) {
3943                         if (idx < s_idx)
3944                                 goto cont;
3945                         if (!nft_is_active(net, set))
3946                                 goto cont;
3947
3948                         ctx_set = *ctx;
3949                         ctx_set.table = table;
3950                         ctx_set.family = table->family;
3951
3952                         if (nf_tables_fill_set(skb, &ctx_set, set,
3953                                                NFT_MSG_NEWSET,
3954                                                NLM_F_MULTI) < 0) {
3955                                 cb->args[0] = idx;
3956                                 cb->args[2] = (unsigned long) table;
3957                                 goto done;
3958                         }
3959                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3960 cont:
3961                         idx++;
3962                 }
3963                 if (s_idx)
3964                         s_idx = 0;
3965         }
3966         cb->args[1] = 1;
3967 done:
3968         rcu_read_unlock();
3969         return skb->len;
3970 }
3971
3972 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3973 {
3974         struct nft_ctx *ctx_dump = NULL;
3975
3976         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3977         if (ctx_dump == NULL)
3978                 return -ENOMEM;
3979
3980         cb->data = ctx_dump;
3981         return 0;
3982 }
3983
3984 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3985 {
3986         kfree(cb->data);
3987         return 0;
3988 }
3989
3990 /* called with rcu_read_lock held */
3991 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3992                             struct sk_buff *skb, const struct nlmsghdr *nlh,
3993                             const struct nlattr * const nla[],
3994                             struct netlink_ext_ack *extack)
3995 {
3996         u8 genmask = nft_genmask_cur(net);
3997         const struct nft_set *set;
3998         struct nft_ctx ctx;
3999         struct sk_buff *skb2;
4000         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4001         int err;
4002
4003         /* Verify existence before starting dump */
4004         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4005                                         genmask);
4006         if (err < 0)
4007                 return err;
4008
4009         if (nlh->nlmsg_flags & NLM_F_DUMP) {
4010                 struct netlink_dump_control c = {
4011                         .start = nf_tables_dump_sets_start,
4012                         .dump = nf_tables_dump_sets,
4013                         .done = nf_tables_dump_sets_done,
4014                         .data = &ctx,
4015                         .module = THIS_MODULE,
4016                 };
4017
4018                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4019         }
4020
4021         /* Only accept unspec with dump */
4022         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4023                 return -EAFNOSUPPORT;
4024         if (!nla[NFTA_SET_TABLE])
4025                 return -EINVAL;
4026
4027         set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4028         if (IS_ERR(set))
4029                 return PTR_ERR(set);
4030
4031         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4032         if (skb2 == NULL)
4033                 return -ENOMEM;
4034
4035         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4036         if (err < 0)
4037                 goto err_fill_set_info;
4038
4039         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4040
4041 err_fill_set_info:
4042         kfree_skb(skb2);
4043         return err;
4044 }
4045
4046 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4047         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4048 };
4049
4050 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4051                                      struct nft_set_desc *desc)
4052 {
4053         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4054         u32 len;
4055         int err;
4056
4057         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4058                                           nft_concat_policy, NULL);
4059         if (err < 0)
4060                 return err;
4061
4062         if (!tb[NFTA_SET_FIELD_LEN])
4063                 return -EINVAL;
4064
4065         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4066
4067         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4068                 return -E2BIG;
4069
4070         desc->field_len[desc->field_count++] = len;
4071
4072         return 0;
4073 }
4074
4075 static int nft_set_desc_concat(struct nft_set_desc *desc,
4076                                const struct nlattr *nla)
4077 {
4078         struct nlattr *attr;
4079         int rem, err;
4080
4081         nla_for_each_nested(attr, nla, rem) {
4082                 if (nla_type(attr) != NFTA_LIST_ELEM)
4083                         return -EINVAL;
4084
4085                 err = nft_set_desc_concat_parse(attr, desc);
4086                 if (err < 0)
4087                         return err;
4088         }
4089
4090         return 0;
4091 }
4092
4093 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4094                                     const struct nlattr *nla)
4095 {
4096         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4097         int err;
4098
4099         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4100                                           nft_set_desc_policy, NULL);
4101         if (err < 0)
4102                 return err;
4103
4104         if (da[NFTA_SET_DESC_SIZE] != NULL)
4105                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4106         if (da[NFTA_SET_DESC_CONCAT])
4107                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4108
4109         return err;
4110 }
4111
4112 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4113                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4114                             const struct nlattr * const nla[],
4115                             struct netlink_ext_ack *extack)
4116 {
4117         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4118         u8 genmask = nft_genmask_next(net);
4119         int family = nfmsg->nfgen_family;
4120         const struct nft_set_ops *ops;
4121         struct nft_expr *expr = NULL;
4122         struct nft_table *table;
4123         struct nft_set *set;
4124         struct nft_ctx ctx;
4125         char *name;
4126         u64 size;
4127         u64 timeout;
4128         u32 ktype, dtype, flags, policy, gc_int, objtype;
4129         struct nft_set_desc desc;
4130         unsigned char *udata;
4131         u16 udlen;
4132         int err;
4133         int i;
4134
4135         if (nla[NFTA_SET_TABLE] == NULL ||
4136             nla[NFTA_SET_NAME] == NULL ||
4137             nla[NFTA_SET_KEY_LEN] == NULL ||
4138             nla[NFTA_SET_ID] == NULL)
4139                 return -EINVAL;
4140
4141         memset(&desc, 0, sizeof(desc));
4142
4143         ktype = NFT_DATA_VALUE;
4144         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4145                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4146                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4147                         return -EINVAL;
4148         }
4149
4150         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4151         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4152                 return -EINVAL;
4153
4154         flags = 0;
4155         if (nla[NFTA_SET_FLAGS] != NULL) {
4156                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4157                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4158                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4159                               NFT_SET_MAP | NFT_SET_EVAL |
4160                               NFT_SET_OBJECT | NFT_SET_CONCAT))
4161                         return -EOPNOTSUPP;
4162                 /* Only one of these operations is supported */
4163                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4164                              (NFT_SET_MAP | NFT_SET_OBJECT))
4165                         return -EOPNOTSUPP;
4166                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4167                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4168                         return -EOPNOTSUPP;
4169         }
4170
4171         dtype = 0;
4172         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4173                 if (!(flags & NFT_SET_MAP))
4174                         return -EINVAL;
4175
4176                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4177                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4178                     dtype != NFT_DATA_VERDICT)
4179                         return -EINVAL;
4180
4181                 if (dtype != NFT_DATA_VERDICT) {
4182                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4183                                 return -EINVAL;
4184                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4185                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4186                                 return -EINVAL;
4187                 } else
4188                         desc.dlen = sizeof(struct nft_verdict);
4189         } else if (flags & NFT_SET_MAP)
4190                 return -EINVAL;
4191
4192         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4193                 if (!(flags & NFT_SET_OBJECT))
4194                         return -EINVAL;
4195
4196                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4197                 if (objtype == NFT_OBJECT_UNSPEC ||
4198                     objtype > NFT_OBJECT_MAX)
4199                         return -EOPNOTSUPP;
4200         } else if (flags & NFT_SET_OBJECT)
4201                 return -EINVAL;
4202         else
4203                 objtype = NFT_OBJECT_UNSPEC;
4204
4205         timeout = 0;
4206         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4207                 if (!(flags & NFT_SET_TIMEOUT))
4208                         return -EINVAL;
4209
4210                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4211                 if (err)
4212                         return err;
4213         }
4214         gc_int = 0;
4215         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4216                 if (!(flags & NFT_SET_TIMEOUT))
4217                         return -EINVAL;
4218                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4219         }
4220
4221         policy = NFT_SET_POL_PERFORMANCE;
4222         if (nla[NFTA_SET_POLICY] != NULL)
4223                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4224
4225         if (nla[NFTA_SET_DESC] != NULL) {
4226                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4227                 if (err < 0)
4228                         return err;
4229         }
4230
4231         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4232                 desc.expr = true;
4233
4234         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4235         if (IS_ERR(table)) {
4236                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4237                 return PTR_ERR(table);
4238         }
4239
4240         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4241
4242         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4243         if (IS_ERR(set)) {
4244                 if (PTR_ERR(set) != -ENOENT) {
4245                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4246                         return PTR_ERR(set);
4247                 }
4248         } else {
4249                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4250                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4251                         return -EEXIST;
4252                 }
4253                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4254                         return -EOPNOTSUPP;
4255
4256                 return 0;
4257         }
4258
4259         if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4260                 return -ENOENT;
4261
4262         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4263         if (IS_ERR(ops))
4264                 return PTR_ERR(ops);
4265
4266         udlen = 0;
4267         if (nla[NFTA_SET_USERDATA])
4268                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4269
4270         size = 0;
4271         if (ops->privsize != NULL)
4272                 size = ops->privsize(nla, &desc);
4273
4274         set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4275         if (!set)
4276                 return -ENOMEM;
4277
4278         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4279         if (!name) {
4280                 err = -ENOMEM;
4281                 goto err_set_name;
4282         }
4283
4284         err = nf_tables_set_alloc_name(&ctx, set, name);
4285         kfree(name);
4286         if (err < 0)
4287                 goto err_set_alloc_name;
4288
4289         if (nla[NFTA_SET_EXPR]) {
4290                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4291                 if (IS_ERR(expr)) {
4292                         err = PTR_ERR(expr);
4293                         goto err_set_alloc_name;
4294                 }
4295                 set->exprs[0] = expr;
4296                 set->num_exprs++;
4297         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4298                 struct nft_expr *expr;
4299                 struct nlattr *tmp;
4300                 int left;
4301
4302                 i = 0;
4303                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4304                         if (i == NFT_SET_EXPR_MAX) {
4305                                 err = -E2BIG;
4306                                 goto err_set_init;
4307                         }
4308                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4309                                 err = -EINVAL;
4310                                 goto err_set_init;
4311                         }
4312                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4313                         if (IS_ERR(expr)) {
4314                                 err = PTR_ERR(expr);
4315                                 goto err_set_init;
4316                         }
4317                         set->exprs[i++] = expr;
4318                         set->num_exprs++;
4319                 }
4320         }
4321
4322         udata = NULL;
4323         if (udlen) {
4324                 udata = set->data + size;
4325                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4326         }
4327
4328         INIT_LIST_HEAD(&set->bindings);
4329         set->table = table;
4330         write_pnet(&set->net, net);
4331         set->ops   = ops;
4332         set->ktype = ktype;
4333         set->klen  = desc.klen;
4334         set->dtype = dtype;
4335         set->objtype = objtype;
4336         set->dlen  = desc.dlen;
4337         set->flags = flags;
4338         set->size  = desc.size;
4339         set->policy = policy;
4340         set->udlen  = udlen;
4341         set->udata  = udata;
4342         set->timeout = timeout;
4343         set->gc_int = gc_int;
4344         set->handle = nf_tables_alloc_handle(table);
4345
4346         set->field_count = desc.field_count;
4347         for (i = 0; i < desc.field_count; i++)
4348                 set->field_len[i] = desc.field_len[i];
4349
4350         err = ops->init(set, &desc, nla);
4351         if (err < 0)
4352                 goto err_set_init;
4353
4354         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4355         if (err < 0)
4356                 goto err_set_trans;
4357
4358         list_add_tail_rcu(&set->list, &table->sets);
4359         table->use++;
4360         return 0;
4361
4362 err_set_trans:
4363         ops->destroy(set);
4364 err_set_init:
4365         for (i = 0; i < set->num_exprs; i++)
4366                 nft_expr_destroy(&ctx, set->exprs[i]);
4367 err_set_alloc_name:
4368         kfree(set->name);
4369 err_set_name:
4370         kvfree(set);
4371         return err;
4372 }
4373
4374 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4375 {
4376         int i;
4377
4378         if (WARN_ON(set->use > 0))
4379                 return;
4380
4381         for (i = 0; i < set->num_exprs; i++)
4382                 nft_expr_destroy(ctx, set->exprs[i]);
4383
4384         set->ops->destroy(set);
4385         kfree(set->name);
4386         kvfree(set);
4387 }
4388
4389 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4390                             struct sk_buff *skb, const struct nlmsghdr *nlh,
4391                             const struct nlattr * const nla[],
4392                             struct netlink_ext_ack *extack)
4393 {
4394         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4395         u8 genmask = nft_genmask_next(net);
4396         const struct nlattr *attr;
4397         struct nft_set *set;
4398         struct nft_ctx ctx;
4399         int err;
4400
4401         if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4402                 return -EAFNOSUPPORT;
4403         if (nla[NFTA_SET_TABLE] == NULL)
4404                 return -EINVAL;
4405
4406         err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4407                                         genmask);
4408         if (err < 0)
4409                 return err;
4410
4411         if (nla[NFTA_SET_HANDLE]) {
4412                 attr = nla[NFTA_SET_HANDLE];
4413                 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4414         } else {
4415                 attr = nla[NFTA_SET_NAME];
4416                 set = nft_set_lookup(ctx.table, attr, genmask);
4417         }
4418
4419         if (IS_ERR(set)) {
4420                 NL_SET_BAD_ATTR(extack, attr);
4421                 return PTR_ERR(set);
4422         }
4423         if (set->use ||
4424             (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4425                 NL_SET_BAD_ATTR(extack, attr);
4426                 return -EBUSY;
4427         }
4428
4429         return nft_delset(&ctx, set);
4430 }
4431
4432 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4433                                         struct nft_set *set,
4434                                         const struct nft_set_iter *iter,
4435                                         struct nft_set_elem *elem)
4436 {
4437         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4438         enum nft_registers dreg;
4439
4440         dreg = nft_type_to_reg(set->dtype);
4441         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4442                                            set->dtype == NFT_DATA_VERDICT ?
4443                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4444                                            set->dlen);
4445 }
4446
4447 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4448                        struct nft_set_binding *binding)
4449 {
4450         struct nft_set_binding *i;
4451         struct nft_set_iter iter;
4452
4453         if (set->use == UINT_MAX)
4454                 return -EOVERFLOW;
4455
4456         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4457                 return -EBUSY;
4458
4459         if (binding->flags & NFT_SET_MAP) {
4460                 /* If the set is already bound to the same chain all
4461                  * jumps are already validated for that chain.
4462                  */
4463                 list_for_each_entry(i, &set->bindings, list) {
4464                         if (i->flags & NFT_SET_MAP &&
4465                             i->chain == binding->chain)
4466                                 goto bind;
4467                 }
4468
4469                 iter.genmask    = nft_genmask_next(ctx->net);
4470                 iter.skip       = 0;
4471                 iter.count      = 0;
4472                 iter.err        = 0;
4473                 iter.fn         = nf_tables_bind_check_setelem;
4474
4475                 set->ops->walk(ctx, set, &iter);
4476                 if (iter.err < 0)
4477                         return iter.err;
4478         }
4479 bind:
4480         binding->chain = ctx->chain;
4481         list_add_tail_rcu(&binding->list, &set->bindings);
4482         nft_set_trans_bind(ctx, set);
4483         set->use++;
4484
4485         return 0;
4486 }
4487 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4488
4489 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4490                                  struct nft_set_binding *binding, bool event)
4491 {
4492         list_del_rcu(&binding->list);
4493
4494         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4495                 list_del_rcu(&set->list);
4496                 if (event)
4497                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4498                                              GFP_KERNEL);
4499         }
4500 }
4501
4502 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4503                               struct nft_set_binding *binding,
4504                               enum nft_trans_phase phase)
4505 {
4506         switch (phase) {
4507         case NFT_TRANS_PREPARE:
4508                 set->use--;
4509                 return;
4510         case NFT_TRANS_ABORT:
4511         case NFT_TRANS_RELEASE:
4512                 set->use--;
4513                 fallthrough;
4514         default:
4515                 nf_tables_unbind_set(ctx, set, binding,
4516                                      phase == NFT_TRANS_COMMIT);
4517         }
4518 }
4519 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4520
4521 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4522 {
4523         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4524                 nft_set_destroy(ctx, set);
4525 }
4526 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4527
4528 const struct nft_set_ext_type nft_set_ext_types[] = {
4529         [NFT_SET_EXT_KEY]               = {
4530                 .align  = __alignof__(u32),
4531         },
4532         [NFT_SET_EXT_DATA]              = {
4533                 .align  = __alignof__(u32),
4534         },
4535         [NFT_SET_EXT_EXPRESSIONS]       = {
4536                 .align  = __alignof__(struct nft_set_elem_expr),
4537         },
4538         [NFT_SET_EXT_OBJREF]            = {
4539                 .len    = sizeof(struct nft_object *),
4540                 .align  = __alignof__(struct nft_object *),
4541         },
4542         [NFT_SET_EXT_FLAGS]             = {
4543                 .len    = sizeof(u8),
4544                 .align  = __alignof__(u8),
4545         },
4546         [NFT_SET_EXT_TIMEOUT]           = {
4547                 .len    = sizeof(u64),
4548                 .align  = __alignof__(u64),
4549         },
4550         [NFT_SET_EXT_EXPIRATION]        = {
4551                 .len    = sizeof(u64),
4552                 .align  = __alignof__(u64),
4553         },
4554         [NFT_SET_EXT_USERDATA]          = {
4555                 .len    = sizeof(struct nft_userdata),
4556                 .align  = __alignof__(struct nft_userdata),
4557         },
4558         [NFT_SET_EXT_KEY_END]           = {
4559                 .align  = __alignof__(u32),
4560         },
4561 };
4562
4563 /*
4564  * Set elements
4565  */
4566
4567 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4568         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4569         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4570         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4571         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4572         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4573         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4574                                             .len = NFT_USERDATA_MAXLEN },
4575         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4576         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4577                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4578         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4579         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4580 };
4581
4582 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4583         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4584                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4585         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4586                                             .len = NFT_SET_MAXNAMELEN - 1 },
4587         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4588         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4589 };
4590
4591 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4592                                       const struct sk_buff *skb,
4593                                       const struct nlmsghdr *nlh,
4594                                       const struct nlattr * const nla[],
4595                                       struct netlink_ext_ack *extack,
4596                                       u8 genmask)
4597 {
4598         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4599         int family = nfmsg->nfgen_family;
4600         struct nft_table *table;
4601
4602         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4603                                  genmask);
4604         if (IS_ERR(table)) {
4605                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4606                 return PTR_ERR(table);
4607         }
4608
4609         nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4610         return 0;
4611 }
4612
4613 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4614                                   const struct nft_set *set,
4615                                   const struct nft_set_ext *ext)
4616 {
4617         struct nft_set_elem_expr *elem_expr;
4618         u32 size, num_exprs = 0;
4619         struct nft_expr *expr;
4620         struct nlattr *nest;
4621
4622         elem_expr = nft_set_ext_expr(ext);
4623         nft_setelem_expr_foreach(expr, elem_expr, size)
4624                 num_exprs++;
4625
4626         if (num_exprs == 1) {
4627                 expr = nft_setelem_expr_at(elem_expr, 0);
4628                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4629                         return -1;
4630
4631                 return 0;
4632         } else if (num_exprs > 1) {
4633                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4634                 if (nest == NULL)
4635                         goto nla_put_failure;
4636
4637                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4638                         expr = nft_setelem_expr_at(elem_expr, size);
4639                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4640                                 goto nla_put_failure;
4641                 }
4642                 nla_nest_end(skb, nest);
4643         }
4644         return 0;
4645
4646 nla_put_failure:
4647         return -1;
4648 }
4649
4650 static int nf_tables_fill_setelem(struct sk_buff *skb,
4651                                   const struct nft_set *set,
4652                                   const struct nft_set_elem *elem)
4653 {
4654         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4655         unsigned char *b = skb_tail_pointer(skb);
4656         struct nlattr *nest;
4657
4658         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4659         if (nest == NULL)
4660                 goto nla_put_failure;
4661
4662         if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4663                           NFT_DATA_VALUE, set->klen) < 0)
4664                 goto nla_put_failure;
4665
4666         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4667             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4668                           NFT_DATA_VALUE, set->klen) < 0)
4669                 goto nla_put_failure;
4670
4671         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4672             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4673                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4674                           set->dlen) < 0)
4675                 goto nla_put_failure;
4676
4677         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4678             nft_set_elem_expr_dump(skb, set, ext))
4679                 goto nla_put_failure;
4680
4681         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4682             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4683                            (*nft_set_ext_obj(ext))->key.name) < 0)
4684                 goto nla_put_failure;
4685
4686         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4687             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4688                          htonl(*nft_set_ext_flags(ext))))
4689                 goto nla_put_failure;
4690
4691         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4692             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4693                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4694                          NFTA_SET_ELEM_PAD))
4695                 goto nla_put_failure;
4696
4697         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4698                 u64 expires, now = get_jiffies_64();
4699
4700                 expires = *nft_set_ext_expiration(ext);
4701                 if (time_before64(now, expires))
4702                         expires -= now;
4703                 else
4704                         expires = 0;
4705
4706                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4707                                  nf_jiffies64_to_msecs(expires),
4708                                  NFTA_SET_ELEM_PAD))
4709                         goto nla_put_failure;
4710         }
4711
4712         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4713                 struct nft_userdata *udata;
4714
4715                 udata = nft_set_ext_userdata(ext);
4716                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4717                             udata->len + 1, udata->data))
4718                         goto nla_put_failure;
4719         }
4720
4721         nla_nest_end(skb, nest);
4722         return 0;
4723
4724 nla_put_failure:
4725         nlmsg_trim(skb, b);
4726         return -EMSGSIZE;
4727 }
4728
4729 struct nft_set_dump_args {
4730         const struct netlink_callback   *cb;
4731         struct nft_set_iter             iter;
4732         struct sk_buff                  *skb;
4733 };
4734
4735 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4736                                   struct nft_set *set,
4737                                   const struct nft_set_iter *iter,
4738                                   struct nft_set_elem *elem)
4739 {
4740         struct nft_set_dump_args *args;
4741
4742         args = container_of(iter, struct nft_set_dump_args, iter);
4743         return nf_tables_fill_setelem(args->skb, set, elem);
4744 }
4745
4746 struct nft_set_dump_ctx {
4747         const struct nft_set    *set;
4748         struct nft_ctx          ctx;
4749 };
4750
4751 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4752 {
4753         struct nft_set_dump_ctx *dump_ctx = cb->data;
4754         struct net *net = sock_net(skb->sk);
4755         struct nft_table *table;
4756         struct nft_set *set;
4757         struct nft_set_dump_args args;
4758         bool set_found = false;
4759         struct nfgenmsg *nfmsg;
4760         struct nlmsghdr *nlh;
4761         struct nlattr *nest;
4762         u32 portid, seq;
4763         int event;
4764
4765         rcu_read_lock();
4766         list_for_each_entry_rcu(table, &net->nft.tables, list) {
4767                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4768                     dump_ctx->ctx.family != table->family)
4769                         continue;
4770
4771                 if (table != dump_ctx->ctx.table)
4772                         continue;
4773
4774                 list_for_each_entry_rcu(set, &table->sets, list) {
4775                         if (set == dump_ctx->set) {
4776                                 set_found = true;
4777                                 break;
4778                         }
4779                 }
4780                 break;
4781         }
4782
4783         if (!set_found) {
4784                 rcu_read_unlock();
4785                 return -ENOENT;
4786         }
4787
4788         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4789         portid = NETLINK_CB(cb->skb).portid;
4790         seq    = cb->nlh->nlmsg_seq;
4791
4792         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4793                         NLM_F_MULTI);
4794         if (nlh == NULL)
4795                 goto nla_put_failure;
4796
4797         nfmsg = nlmsg_data(nlh);
4798         nfmsg->nfgen_family = table->family;
4799         nfmsg->version      = NFNETLINK_V0;
4800         nfmsg->res_id       = htons(net->nft.base_seq & 0xffff);
4801
4802         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4803                 goto nla_put_failure;
4804         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, 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         args.cb                 = cb;
4812         args.skb                = skb;
4813         args.iter.genmask       = nft_genmask_cur(net);
4814         args.iter.skip          = cb->args[0];
4815         args.iter.count         = 0;
4816         args.iter.err           = 0;
4817         args.iter.fn            = nf_tables_dump_setelem;
4818         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4819         rcu_read_unlock();
4820
4821         nla_nest_end(skb, nest);
4822         nlmsg_end(skb, nlh);
4823
4824         if (args.iter.err && args.iter.err != -EMSGSIZE)
4825                 return args.iter.err;
4826         if (args.iter.count == cb->args[0])
4827                 return 0;
4828
4829         cb->args[0] = args.iter.count;
4830         return skb->len;
4831
4832 nla_put_failure:
4833         rcu_read_unlock();
4834         return -ENOSPC;
4835 }
4836
4837 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4838 {
4839         struct nft_set_dump_ctx *dump_ctx = cb->data;
4840
4841         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4842
4843         return cb->data ? 0 : -ENOMEM;
4844 }
4845
4846 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4847 {
4848         kfree(cb->data);
4849         return 0;
4850 }
4851
4852 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4853                                        const struct nft_ctx *ctx, u32 seq,
4854                                        u32 portid, int event, u16 flags,
4855                                        const struct nft_set *set,
4856                                        const struct nft_set_elem *elem)
4857 {
4858         struct nfgenmsg *nfmsg;
4859         struct nlmsghdr *nlh;
4860         struct nlattr *nest;
4861         int err;
4862
4863         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4864         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4865                         flags);
4866         if (nlh == NULL)
4867                 goto nla_put_failure;
4868
4869         nfmsg = nlmsg_data(nlh);
4870         nfmsg->nfgen_family     = ctx->family;
4871         nfmsg->version          = NFNETLINK_V0;
4872         nfmsg->res_id           = htons(ctx->net->nft.base_seq & 0xffff);
4873
4874         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4875                 goto nla_put_failure;
4876         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4877                 goto nla_put_failure;
4878
4879         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4880         if (nest == NULL)
4881                 goto nla_put_failure;
4882
4883         err = nf_tables_fill_setelem(skb, set, elem);
4884         if (err < 0)
4885                 goto nla_put_failure;
4886
4887         nla_nest_end(skb, nest);
4888
4889         nlmsg_end(skb, nlh);
4890         return 0;
4891
4892 nla_put_failure:
4893         nlmsg_trim(skb, nlh);
4894         return -1;
4895 }
4896
4897 static int nft_setelem_parse_flags(const struct nft_set *set,
4898                                    const struct nlattr *attr, u32 *flags)
4899 {
4900         if (attr == NULL)
4901                 return 0;
4902
4903         *flags = ntohl(nla_get_be32(attr));
4904         if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4905                 return -EINVAL;
4906         if (!(set->flags & NFT_SET_INTERVAL) &&
4907             *flags & NFT_SET_ELEM_INTERVAL_END)
4908                 return -EINVAL;
4909
4910         return 0;
4911 }
4912
4913 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4914                                  struct nft_data *key, struct nlattr *attr)
4915 {
4916         struct nft_data_desc desc;
4917         int err;
4918
4919         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4920         if (err < 0)
4921                 return err;
4922
4923         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4924                 nft_data_release(key, desc.type);
4925                 return -EINVAL;
4926         }
4927
4928         return 0;
4929 }
4930
4931 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4932                                   struct nft_data_desc *desc,
4933                                   struct nft_data *data,
4934                                   struct nlattr *attr)
4935 {
4936         int err;
4937
4938         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4939         if (err < 0)
4940                 return err;
4941
4942         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4943                 nft_data_release(data, desc->type);
4944                 return -EINVAL;
4945         }
4946
4947         return 0;
4948 }
4949
4950 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4951                             const struct nlattr *attr)
4952 {
4953         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4954         struct nft_set_elem elem;
4955         struct sk_buff *skb;
4956         uint32_t flags = 0;
4957         void *priv;
4958         int err;
4959
4960         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4961                                           nft_set_elem_policy, NULL);
4962         if (err < 0)
4963                 return err;
4964
4965         if (!nla[NFTA_SET_ELEM_KEY])
4966                 return -EINVAL;
4967
4968         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4969         if (err < 0)
4970                 return err;
4971
4972         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4973                                     nla[NFTA_SET_ELEM_KEY]);
4974         if (err < 0)
4975                 return err;
4976
4977         if (nla[NFTA_SET_ELEM_KEY_END]) {
4978                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4979                                             nla[NFTA_SET_ELEM_KEY_END]);
4980                 if (err < 0)
4981                         return err;
4982         }
4983
4984         priv = set->ops->get(ctx->net, set, &elem, flags);
4985         if (IS_ERR(priv))
4986                 return PTR_ERR(priv);
4987
4988         elem.priv = priv;
4989
4990         err = -ENOMEM;
4991         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4992         if (skb == NULL)
4993                 return err;
4994
4995         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4996                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
4997         if (err < 0)
4998                 goto err_fill_setelem;
4999
5000         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5001
5002 err_fill_setelem:
5003         kfree_skb(skb);
5004         return err;
5005 }
5006
5007 /* called with rcu_read_lock held */
5008 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
5009                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5010                                 const struct nlattr * const nla[],
5011                                 struct netlink_ext_ack *extack)
5012 {
5013         u8 genmask = nft_genmask_cur(net);
5014         struct nft_set *set;
5015         struct nlattr *attr;
5016         struct nft_ctx ctx;
5017         int rem, err = 0;
5018
5019         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5020                                          genmask);
5021         if (err < 0)
5022                 return err;
5023
5024         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5025         if (IS_ERR(set))
5026                 return PTR_ERR(set);
5027
5028         if (nlh->nlmsg_flags & NLM_F_DUMP) {
5029                 struct netlink_dump_control c = {
5030                         .start = nf_tables_dump_set_start,
5031                         .dump = nf_tables_dump_set,
5032                         .done = nf_tables_dump_set_done,
5033                         .module = THIS_MODULE,
5034                 };
5035                 struct nft_set_dump_ctx dump_ctx = {
5036                         .set = set,
5037                         .ctx = ctx,
5038                 };
5039
5040                 c.data = &dump_ctx;
5041                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5042         }
5043
5044         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5045                 return -EINVAL;
5046
5047         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5048                 err = nft_get_set_elem(&ctx, set, attr);
5049                 if (err < 0)
5050                         break;
5051         }
5052
5053         return err;
5054 }
5055
5056 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5057                                      const struct nft_set *set,
5058                                      const struct nft_set_elem *elem,
5059                                      int event, u16 flags)
5060 {
5061         struct net *net = ctx->net;
5062         u32 portid = ctx->portid;
5063         struct sk_buff *skb;
5064         int err;
5065         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
5066                               ctx->table->name, ctx->table->handle,
5067                               set->name, set->handle);
5068
5069         audit_log_nfcfg(buf,
5070                         ctx->family,
5071                         set->handle,
5072                         event == NFT_MSG_NEWSETELEM ?
5073                                 AUDIT_NFT_OP_SETELEM_REGISTER :
5074                                 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5075                         GFP_KERNEL);
5076         kfree(buf);
5077
5078         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5079                 return;
5080
5081         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5082         if (skb == NULL)
5083                 goto err;
5084
5085         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5086                                           set, elem);
5087         if (err < 0) {
5088                 kfree_skb(skb);
5089                 goto err;
5090         }
5091
5092         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5093         return;
5094 err:
5095         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5096 }
5097
5098 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5099                                               int msg_type,
5100                                               struct nft_set *set)
5101 {
5102         struct nft_trans *trans;
5103
5104         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5105         if (trans == NULL)
5106                 return NULL;
5107
5108         nft_trans_elem_set(trans) = set;
5109         return trans;
5110 }
5111
5112 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5113                                          const struct nft_set *set,
5114                                          const struct nlattr *attr)
5115 {
5116         struct nft_expr *expr;
5117         int err;
5118
5119         expr = nft_expr_init(ctx, attr);
5120         if (IS_ERR(expr))
5121                 return expr;
5122
5123         err = -EOPNOTSUPP;
5124         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5125                 goto err_set_elem_expr;
5126
5127         if (expr->ops->type->flags & NFT_EXPR_GC) {
5128                 if (set->flags & NFT_SET_TIMEOUT)
5129                         goto err_set_elem_expr;
5130                 if (!set->ops->gc_init)
5131                         goto err_set_elem_expr;
5132                 set->ops->gc_init(set);
5133         }
5134
5135         return expr;
5136
5137 err_set_elem_expr:
5138         nft_expr_destroy(ctx, expr);
5139         return ERR_PTR(err);
5140 }
5141
5142 void *nft_set_elem_init(const struct nft_set *set,
5143                         const struct nft_set_ext_tmpl *tmpl,
5144                         const u32 *key, const u32 *key_end,
5145                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5146 {
5147         struct nft_set_ext *ext;
5148         void *elem;
5149
5150         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5151         if (elem == NULL)
5152                 return NULL;
5153
5154         ext = nft_set_elem_ext(set, elem);
5155         nft_set_ext_init(ext, tmpl);
5156
5157         memcpy(nft_set_ext_key(ext), key, set->klen);
5158         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5159                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5160         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5161                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5162         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5163                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5164                 if (expiration == 0)
5165                         *nft_set_ext_expiration(ext) += timeout;
5166         }
5167         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5168                 *nft_set_ext_timeout(ext) = timeout;
5169
5170         return elem;
5171 }
5172
5173 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5174                                         struct nft_expr *expr)
5175 {
5176         if (expr->ops->destroy_clone) {
5177                 expr->ops->destroy_clone(ctx, expr);
5178                 module_put(expr->ops->type->owner);
5179         } else {
5180                 nf_tables_expr_destroy(ctx, expr);
5181         }
5182 }
5183
5184 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5185                                       struct nft_set_elem_expr *elem_expr)
5186 {
5187         struct nft_expr *expr;
5188         u32 size;
5189
5190         nft_setelem_expr_foreach(expr, elem_expr, size)
5191                 __nft_set_elem_expr_destroy(ctx, expr);
5192 }
5193
5194 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5195                           bool destroy_expr)
5196 {
5197         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5198         struct nft_ctx ctx = {
5199                 .net    = read_pnet(&set->net),
5200                 .family = set->table->family,
5201         };
5202
5203         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5204         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5205                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5206         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5207                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5208
5209         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5210                 (*nft_set_ext_obj(ext))->use--;
5211         kfree(elem);
5212 }
5213 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5214
5215 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5216  * the refcounting from the preparation phase.
5217  */
5218 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5219                                        const struct nft_set *set, void *elem)
5220 {
5221         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5222
5223         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5224                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5225
5226         kfree(elem);
5227 }
5228
5229 static int nft_set_elem_expr_clone(const struct nft_ctx *ctx,
5230                                    struct nft_set *set,
5231                                    struct nft_expr *expr_array[])
5232 {
5233         struct nft_expr *expr;
5234         int err, i, k;
5235
5236         for (i = 0; i < set->num_exprs; i++) {
5237                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5238                 if (!expr)
5239                         goto err_expr;
5240
5241                 err = nft_expr_clone(expr, set->exprs[i]);
5242                 if (err < 0) {
5243                         nft_expr_destroy(ctx, expr);
5244                         goto err_expr;
5245                 }
5246                 expr_array[i] = expr;
5247         }
5248
5249         return 0;
5250
5251 err_expr:
5252         for (k = i - 1; k >= 0; k++)
5253                 nft_expr_destroy(ctx, expr_array[i]);
5254
5255         return -ENOMEM;
5256 }
5257
5258 static void nft_set_elem_expr_setup(const struct nft_set_ext *ext, int i,
5259                                     struct nft_expr *expr_array[])
5260 {
5261         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5262         struct nft_expr *expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5263
5264         memcpy(expr, expr_array[i], expr_array[i]->ops->size);
5265         elem_expr->size += expr_array[i]->ops->size;
5266         kfree(expr_array[i]);
5267         expr_array[i] = NULL;
5268 }
5269
5270 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5271                             const struct nlattr *attr, u32 nlmsg_flags)
5272 {
5273         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5274         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5275         u8 genmask = nft_genmask_next(ctx->net);
5276         struct nft_set_ext_tmpl tmpl;
5277         struct nft_set_ext *ext, *ext2;
5278         struct nft_set_elem elem;
5279         struct nft_set_binding *binding;
5280         struct nft_object *obj = NULL;
5281         struct nft_userdata *udata;
5282         struct nft_data_desc desc;
5283         enum nft_registers dreg;
5284         struct nft_trans *trans;
5285         u32 flags = 0, size = 0;
5286         u64 timeout;
5287         u64 expiration;
5288         int err, i;
5289         u8 ulen;
5290
5291         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5292                                           nft_set_elem_policy, NULL);
5293         if (err < 0)
5294                 return err;
5295
5296         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5297                 return -EINVAL;
5298
5299         nft_set_ext_prepare(&tmpl);
5300
5301         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5302         if (err < 0)
5303                 return err;
5304         if (flags != 0)
5305                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5306
5307         if (set->flags & NFT_SET_MAP) {
5308                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5309                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5310                         return -EINVAL;
5311         } else {
5312                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5313                         return -EINVAL;
5314         }
5315
5316         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5317              (nla[NFTA_SET_ELEM_DATA] ||
5318               nla[NFTA_SET_ELEM_OBJREF] ||
5319               nla[NFTA_SET_ELEM_TIMEOUT] ||
5320               nla[NFTA_SET_ELEM_EXPIRATION] ||
5321               nla[NFTA_SET_ELEM_USERDATA] ||
5322               nla[NFTA_SET_ELEM_EXPR] ||
5323               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5324                 return -EINVAL;
5325
5326         timeout = 0;
5327         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5328                 if (!(set->flags & NFT_SET_TIMEOUT))
5329                         return -EINVAL;
5330                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5331                                             &timeout);
5332                 if (err)
5333                         return err;
5334         } else if (set->flags & NFT_SET_TIMEOUT) {
5335                 timeout = set->timeout;
5336         }
5337
5338         expiration = 0;
5339         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5340                 if (!(set->flags & NFT_SET_TIMEOUT))
5341                         return -EINVAL;
5342                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5343                                             &expiration);
5344                 if (err)
5345                         return err;
5346         }
5347
5348         if (nla[NFTA_SET_ELEM_EXPR]) {
5349                 struct nft_expr *expr;
5350
5351                 if (set->num_exprs != 1)
5352                         return -EOPNOTSUPP;
5353
5354                 expr = nft_set_elem_expr_alloc(ctx, set,
5355                                                nla[NFTA_SET_ELEM_EXPR]);
5356                 if (IS_ERR(expr))
5357                         return PTR_ERR(expr);
5358
5359                 expr_array[0] = expr;
5360
5361                 if (set->exprs[0] && set->exprs[0]->ops != expr->ops) {
5362                         err = -EOPNOTSUPP;
5363                         goto err_set_elem_expr;
5364                 }
5365         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5366                 struct nft_expr *expr;
5367                 struct nlattr *tmp;
5368                 int left;
5369
5370                 if (set->num_exprs == 0)
5371                         return -EOPNOTSUPP;
5372
5373                 i = 0;
5374                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5375                         if (i == set->num_exprs) {
5376                                 err = -E2BIG;
5377                                 goto err_set_elem_expr;
5378                         }
5379                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5380                                 err = -EINVAL;
5381                                 goto err_set_elem_expr;
5382                         }
5383                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5384                         if (IS_ERR(expr)) {
5385                                 err = PTR_ERR(expr);
5386                                 goto err_set_elem_expr;
5387                         }
5388                         expr_array[i] = expr;
5389
5390                         if (expr->ops != set->exprs[i]->ops) {
5391                                 err = -EOPNOTSUPP;
5392                                 goto err_set_elem_expr;
5393                         }
5394                         i++;
5395                 }
5396                 if (set->num_exprs != i) {
5397                         err = -EOPNOTSUPP;
5398                         goto err_set_elem_expr;
5399                 }
5400         } else if (set->num_exprs > 0) {
5401                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5402                 if (err < 0)
5403                         goto err_set_elem_expr_clone;
5404         }
5405
5406         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5407                                     nla[NFTA_SET_ELEM_KEY]);
5408         if (err < 0)
5409                 goto err_set_elem_expr;
5410
5411         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5412
5413         if (nla[NFTA_SET_ELEM_KEY_END]) {
5414                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5415                                             nla[NFTA_SET_ELEM_KEY_END]);
5416                 if (err < 0)
5417                         goto err_parse_key;
5418
5419                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5420         }
5421
5422         if (timeout > 0) {
5423                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5424                 if (timeout != set->timeout)
5425                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5426         }
5427
5428         if (set->num_exprs) {
5429                 for (i = 0; i < set->num_exprs; i++)
5430                         size += expr_array[i]->ops->size;
5431
5432                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5433                                        sizeof(struct nft_set_elem_expr) +
5434                                        size);
5435         }
5436
5437         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5438                 if (!(set->flags & NFT_SET_OBJECT)) {
5439                         err = -EINVAL;
5440                         goto err_parse_key_end;
5441                 }
5442                 obj = nft_obj_lookup(ctx->net, ctx->table,
5443                                      nla[NFTA_SET_ELEM_OBJREF],
5444                                      set->objtype, genmask);
5445                 if (IS_ERR(obj)) {
5446                         err = PTR_ERR(obj);
5447                         goto err_parse_key_end;
5448                 }
5449                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5450         }
5451
5452         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5453                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5454                                              nla[NFTA_SET_ELEM_DATA]);
5455                 if (err < 0)
5456                         goto err_parse_key_end;
5457
5458                 dreg = nft_type_to_reg(set->dtype);
5459                 list_for_each_entry(binding, &set->bindings, list) {
5460                         struct nft_ctx bind_ctx = {
5461                                 .net    = ctx->net,
5462                                 .family = ctx->family,
5463                                 .table  = ctx->table,
5464                                 .chain  = (struct nft_chain *)binding->chain,
5465                         };
5466
5467                         if (!(binding->flags & NFT_SET_MAP))
5468                                 continue;
5469
5470                         err = nft_validate_register_store(&bind_ctx, dreg,
5471                                                           &elem.data.val,
5472                                                           desc.type, desc.len);
5473                         if (err < 0)
5474                                 goto err_parse_data;
5475
5476                         if (desc.type == NFT_DATA_VERDICT &&
5477                             (elem.data.val.verdict.code == NFT_GOTO ||
5478                              elem.data.val.verdict.code == NFT_JUMP))
5479                                 nft_validate_state_update(ctx->net,
5480                                                           NFT_VALIDATE_NEED);
5481                 }
5482
5483                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5484         }
5485
5486         /* The full maximum length of userdata can exceed the maximum
5487          * offset value (U8_MAX) for following extensions, therefor it
5488          * must be the last extension added.
5489          */
5490         ulen = 0;
5491         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5492                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5493                 if (ulen > 0)
5494                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5495                                                ulen);
5496         }
5497
5498         err = -ENOMEM;
5499         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5500                                       elem.key_end.val.data, elem.data.val.data,
5501                                       timeout, expiration, GFP_KERNEL);
5502         if (elem.priv == NULL)
5503                 goto err_parse_data;
5504
5505         ext = nft_set_elem_ext(set, elem.priv);
5506         if (flags)
5507                 *nft_set_ext_flags(ext) = flags;
5508         if (ulen > 0) {
5509                 udata = nft_set_ext_userdata(ext);
5510                 udata->len = ulen - 1;
5511                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5512         }
5513         if (obj) {
5514                 *nft_set_ext_obj(ext) = obj;
5515                 obj->use++;
5516         }
5517         for (i = 0; i < set->num_exprs; i++)
5518                 nft_set_elem_expr_setup(ext, i, expr_array);
5519
5520         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5521         if (trans == NULL)
5522                 goto err_trans;
5523
5524         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5525         err = set->ops->insert(ctx->net, set, &elem, &ext2);
5526         if (err) {
5527                 if (err == -EEXIST) {
5528                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5529                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5530                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5531                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5532                                 goto err_element_clash;
5533                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5534                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5535                              memcmp(nft_set_ext_data(ext),
5536                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5537                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5538                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5539                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5540                                 goto err_element_clash;
5541                         else if (!(nlmsg_flags & NLM_F_EXCL))
5542                                 err = 0;
5543                 } else if (err == -ENOTEMPTY) {
5544                         /* ENOTEMPTY reports overlapping between this element
5545                          * and an existing one.
5546                          */
5547                         err = -EEXIST;
5548                 }
5549                 goto err_element_clash;
5550         }
5551
5552         if (set->size &&
5553             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5554                 err = -ENFILE;
5555                 goto err_set_full;
5556         }
5557
5558         nft_trans_elem(trans) = elem;
5559         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5560         return 0;
5561
5562 err_set_full:
5563         set->ops->remove(ctx->net, set, &elem);
5564 err_element_clash:
5565         kfree(trans);
5566 err_trans:
5567         if (obj)
5568                 obj->use--;
5569
5570         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5571 err_parse_data:
5572         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5573                 nft_data_release(&elem.data.val, desc.type);
5574 err_parse_key_end:
5575         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5576 err_parse_key:
5577         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5578 err_set_elem_expr:
5579         for (i = 0; i < set->num_exprs && expr_array[i]; i++)
5580                 nft_expr_destroy(ctx, expr_array[i]);
5581 err_set_elem_expr_clone:
5582         return err;
5583 }
5584
5585 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5586                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5587                                 const struct nlattr * const nla[],
5588                                 struct netlink_ext_ack *extack)
5589 {
5590         u8 genmask = nft_genmask_next(net);
5591         const struct nlattr *attr;
5592         struct nft_set *set;
5593         struct nft_ctx ctx;
5594         int rem, err;
5595
5596         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5597                 return -EINVAL;
5598
5599         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5600                                          genmask);
5601         if (err < 0)
5602                 return err;
5603
5604         set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5605                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5606         if (IS_ERR(set))
5607                 return PTR_ERR(set);
5608
5609         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5610                 return -EBUSY;
5611
5612         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5613                 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5614                 if (err < 0)
5615                         return err;
5616         }
5617
5618         if (net->nft.validate_state == NFT_VALIDATE_DO)
5619                 return nft_table_validate(net, ctx.table);
5620
5621         return 0;
5622 }
5623
5624 /**
5625  *      nft_data_hold - hold a nft_data item
5626  *
5627  *      @data: struct nft_data to release
5628  *      @type: type of data
5629  *
5630  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5631  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5632  *      NFT_GOTO verdicts. This function must be called on active data objects
5633  *      from the second phase of the commit protocol.
5634  */
5635 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5636 {
5637         struct nft_chain *chain;
5638         struct nft_rule *rule;
5639
5640         if (type == NFT_DATA_VERDICT) {
5641                 switch (data->verdict.code) {
5642                 case NFT_JUMP:
5643                 case NFT_GOTO:
5644                         chain = data->verdict.chain;
5645                         chain->use++;
5646
5647                         if (!nft_chain_is_bound(chain))
5648                                 break;
5649
5650                         chain->table->use++;
5651                         list_for_each_entry(rule, &chain->rules, list)
5652                                 chain->use++;
5653
5654                         nft_chain_add(chain->table, chain);
5655                         break;
5656                 }
5657         }
5658 }
5659
5660 static void nft_set_elem_activate(const struct net *net,
5661                                   const struct nft_set *set,
5662                                   struct nft_set_elem *elem)
5663 {
5664         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5665
5666         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5667                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5668         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5669                 (*nft_set_ext_obj(ext))->use++;
5670 }
5671
5672 static void nft_set_elem_deactivate(const struct net *net,
5673                                     const struct nft_set *set,
5674                                     struct nft_set_elem *elem)
5675 {
5676         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5677
5678         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5679                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5680         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5681                 (*nft_set_ext_obj(ext))->use--;
5682 }
5683
5684 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5685                            const struct nlattr *attr)
5686 {
5687         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5688         struct nft_set_ext_tmpl tmpl;
5689         struct nft_set_elem elem;
5690         struct nft_set_ext *ext;
5691         struct nft_trans *trans;
5692         u32 flags = 0;
5693         void *priv;
5694         int err;
5695
5696         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5697                                           nft_set_elem_policy, NULL);
5698         if (err < 0)
5699                 return err;
5700
5701         if (nla[NFTA_SET_ELEM_KEY] == NULL)
5702                 return -EINVAL;
5703
5704         nft_set_ext_prepare(&tmpl);
5705
5706         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5707         if (err < 0)
5708                 return err;
5709         if (flags != 0)
5710                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5711
5712         err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5713                                     nla[NFTA_SET_ELEM_KEY]);
5714         if (err < 0)
5715                 return err;
5716
5717         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5718
5719         if (nla[NFTA_SET_ELEM_KEY_END]) {
5720                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5721                                             nla[NFTA_SET_ELEM_KEY_END]);
5722                 if (err < 0)
5723                         return err;
5724
5725                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5726         }
5727
5728         err = -ENOMEM;
5729         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5730                                       elem.key_end.val.data, NULL, 0, 0,
5731                                       GFP_KERNEL);
5732         if (elem.priv == NULL)
5733                 goto fail_elem;
5734
5735         ext = nft_set_elem_ext(set, elem.priv);
5736         if (flags)
5737                 *nft_set_ext_flags(ext) = flags;
5738
5739         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5740         if (trans == NULL)
5741                 goto fail_trans;
5742
5743         priv = set->ops->deactivate(ctx->net, set, &elem);
5744         if (priv == NULL) {
5745                 err = -ENOENT;
5746                 goto fail_ops;
5747         }
5748         kfree(elem.priv);
5749         elem.priv = priv;
5750
5751         nft_set_elem_deactivate(ctx->net, set, &elem);
5752
5753         nft_trans_elem(trans) = elem;
5754         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5755         return 0;
5756
5757 fail_ops:
5758         kfree(trans);
5759 fail_trans:
5760         kfree(elem.priv);
5761 fail_elem:
5762         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5763         return err;
5764 }
5765
5766 static int nft_flush_set(const struct nft_ctx *ctx,
5767                          struct nft_set *set,
5768                          const struct nft_set_iter *iter,
5769                          struct nft_set_elem *elem)
5770 {
5771         struct nft_trans *trans;
5772         int err;
5773
5774         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5775                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
5776         if (!trans)
5777                 return -ENOMEM;
5778
5779         if (!set->ops->flush(ctx->net, set, elem->priv)) {
5780                 err = -ENOENT;
5781                 goto err1;
5782         }
5783         set->ndeact++;
5784
5785         nft_set_elem_deactivate(ctx->net, set, elem);
5786         nft_trans_elem_set(trans) = set;
5787         nft_trans_elem(trans) = *elem;
5788         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5789
5790         return 0;
5791 err1:
5792         kfree(trans);
5793         return err;
5794 }
5795
5796 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5797                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
5798                                 const struct nlattr * const nla[],
5799                                 struct netlink_ext_ack *extack)
5800 {
5801         u8 genmask = nft_genmask_next(net);
5802         const struct nlattr *attr;
5803         struct nft_set *set;
5804         struct nft_ctx ctx;
5805         int rem, err = 0;
5806
5807         err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5808                                          genmask);
5809         if (err < 0)
5810                 return err;
5811
5812         set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5813         if (IS_ERR(set))
5814                 return PTR_ERR(set);
5815         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5816                 return -EBUSY;
5817
5818         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5819                 struct nft_set_iter iter = {
5820                         .genmask        = genmask,
5821                         .fn             = nft_flush_set,
5822                 };
5823                 set->ops->walk(&ctx, set, &iter);
5824
5825                 return iter.err;
5826         }
5827
5828         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5829                 err = nft_del_setelem(&ctx, set, attr);
5830                 if (err < 0)
5831                         break;
5832
5833                 set->ndeact++;
5834         }
5835         return err;
5836 }
5837
5838 void nft_set_gc_batch_release(struct rcu_head *rcu)
5839 {
5840         struct nft_set_gc_batch *gcb;
5841         unsigned int i;
5842
5843         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5844         for (i = 0; i < gcb->head.cnt; i++)
5845                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5846         kfree(gcb);
5847 }
5848
5849 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5850                                                 gfp_t gfp)
5851 {
5852         struct nft_set_gc_batch *gcb;
5853
5854         gcb = kzalloc(sizeof(*gcb), gfp);
5855         if (gcb == NULL)
5856                 return gcb;
5857         gcb->head.set = set;
5858         return gcb;
5859 }
5860
5861 /*
5862  * Stateful objects
5863  */
5864
5865 /**
5866  *      nft_register_obj- register nf_tables stateful object type
5867  *      @obj_type: object type
5868  *
5869  *      Registers the object type for use with nf_tables. Returns zero on
5870  *      success or a negative errno code otherwise.
5871  */
5872 int nft_register_obj(struct nft_object_type *obj_type)
5873 {
5874         if (obj_type->type == NFT_OBJECT_UNSPEC)
5875                 return -EINVAL;
5876
5877         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5878         list_add_rcu(&obj_type->list, &nf_tables_objects);
5879         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5880         return 0;
5881 }
5882 EXPORT_SYMBOL_GPL(nft_register_obj);
5883
5884 /**
5885  *      nft_unregister_obj - unregister nf_tables object type
5886  *      @obj_type: object type
5887  *
5888  *      Unregisters the object type for use with nf_tables.
5889  */
5890 void nft_unregister_obj(struct nft_object_type *obj_type)
5891 {
5892         nfnl_lock(NFNL_SUBSYS_NFTABLES);
5893         list_del_rcu(&obj_type->list);
5894         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5895 }
5896 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5897
5898 struct nft_object *nft_obj_lookup(const struct net *net,
5899                                   const struct nft_table *table,
5900                                   const struct nlattr *nla, u32 objtype,
5901                                   u8 genmask)
5902 {
5903         struct nft_object_hash_key k = { .table = table };
5904         char search[NFT_OBJ_MAXNAMELEN];
5905         struct rhlist_head *tmp, *list;
5906         struct nft_object *obj;
5907
5908         nla_strscpy(search, nla, sizeof(search));
5909         k.name = search;
5910
5911         WARN_ON_ONCE(!rcu_read_lock_held() &&
5912                      !lockdep_commit_lock_is_held(net));
5913
5914         rcu_read_lock();
5915         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5916         if (!list)
5917                 goto out;
5918
5919         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5920                 if (objtype == obj->ops->type->type &&
5921                     nft_active_genmask(obj, genmask)) {
5922                         rcu_read_unlock();
5923                         return obj;
5924                 }
5925         }
5926 out:
5927         rcu_read_unlock();
5928         return ERR_PTR(-ENOENT);
5929 }
5930 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5931
5932 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5933                                                   const struct nlattr *nla,
5934                                                   u32 objtype, u8 genmask)
5935 {
5936         struct nft_object *obj;
5937
5938         list_for_each_entry(obj, &table->objects, list) {
5939                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5940                     objtype == obj->ops->type->type &&
5941                     nft_active_genmask(obj, genmask))
5942                         return obj;
5943         }
5944         return ERR_PTR(-ENOENT);
5945 }
5946
5947 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5948         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
5949                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
5950         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
5951                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
5952         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
5953         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
5954         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
5955         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
5956                                     .len = NFT_USERDATA_MAXLEN },
5957 };
5958
5959 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5960                                        const struct nft_object_type *type,
5961                                        const struct nlattr *attr)
5962 {
5963         struct nlattr **tb;
5964         const struct nft_object_ops *ops;
5965         struct nft_object *obj;
5966         int err = -ENOMEM;
5967
5968         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5969         if (!tb)
5970                 goto err1;
5971
5972         if (attr) {
5973                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5974                                                   type->policy, NULL);
5975                 if (err < 0)
5976                         goto err2;
5977         } else {
5978                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5979         }
5980
5981         if (type->select_ops) {
5982                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5983                 if (IS_ERR(ops)) {
5984                         err = PTR_ERR(ops);
5985                         goto err2;
5986                 }
5987         } else {
5988                 ops = type->ops;
5989         }
5990
5991         err = -ENOMEM;
5992         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5993         if (!obj)
5994                 goto err2;
5995
5996         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5997         if (err < 0)
5998                 goto err3;
5999
6000         obj->ops = ops;
6001
6002         kfree(tb);
6003         return obj;
6004 err3:
6005         kfree(obj);
6006 err2:
6007         kfree(tb);
6008 err1:
6009         return ERR_PTR(err);
6010 }
6011
6012 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6013                            struct nft_object *obj, bool reset)
6014 {
6015         struct nlattr *nest;
6016
6017         nest = nla_nest_start_noflag(skb, attr);
6018         if (!nest)
6019                 goto nla_put_failure;
6020         if (obj->ops->dump(skb, obj, reset) < 0)
6021                 goto nla_put_failure;
6022         nla_nest_end(skb, nest);
6023         return 0;
6024
6025 nla_put_failure:
6026         return -1;
6027 }
6028
6029 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6030 {
6031         const struct nft_object_type *type;
6032
6033         list_for_each_entry(type, &nf_tables_objects, list) {
6034                 if (objtype == type->type)
6035                         return type;
6036         }
6037         return NULL;
6038 }
6039
6040 static const struct nft_object_type *
6041 nft_obj_type_get(struct net *net, u32 objtype)
6042 {
6043         const struct nft_object_type *type;
6044
6045         type = __nft_obj_type_get(objtype);
6046         if (type != NULL && try_module_get(type->owner))
6047                 return type;
6048
6049         lockdep_nfnl_nft_mutex_not_held();
6050 #ifdef CONFIG_MODULES
6051         if (type == NULL) {
6052                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6053                         return ERR_PTR(-EAGAIN);
6054         }
6055 #endif
6056         return ERR_PTR(-ENOENT);
6057 }
6058
6059 static int nf_tables_updobj(const struct nft_ctx *ctx,
6060                             const struct nft_object_type *type,
6061                             const struct nlattr *attr,
6062                             struct nft_object *obj)
6063 {
6064         struct nft_object *newobj;
6065         struct nft_trans *trans;
6066         int err;
6067
6068         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6069                                 sizeof(struct nft_trans_obj));
6070         if (!trans)
6071                 return -ENOMEM;
6072
6073         newobj = nft_obj_init(ctx, type, attr);
6074         if (IS_ERR(newobj)) {
6075                 err = PTR_ERR(newobj);
6076                 goto err_free_trans;
6077         }
6078
6079         nft_trans_obj(trans) = obj;
6080         nft_trans_obj_update(trans) = true;
6081         nft_trans_obj_newobj(trans) = newobj;
6082         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6083
6084         return 0;
6085
6086 err_free_trans:
6087         kfree(trans);
6088         return err;
6089 }
6090
6091 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
6092                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6093                             const struct nlattr * const nla[],
6094                             struct netlink_ext_ack *extack)
6095 {
6096         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6097         const struct nft_object_type *type;
6098         u8 genmask = nft_genmask_next(net);
6099         int family = nfmsg->nfgen_family;
6100         struct nft_table *table;
6101         struct nft_object *obj;
6102         struct nft_ctx ctx;
6103         u32 objtype;
6104         int err;
6105
6106         if (!nla[NFTA_OBJ_TYPE] ||
6107             !nla[NFTA_OBJ_NAME] ||
6108             !nla[NFTA_OBJ_DATA])
6109                 return -EINVAL;
6110
6111         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6112         if (IS_ERR(table)) {
6113                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6114                 return PTR_ERR(table);
6115         }
6116
6117         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6118         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6119         if (IS_ERR(obj)) {
6120                 err = PTR_ERR(obj);
6121                 if (err != -ENOENT) {
6122                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6123                         return err;
6124                 }
6125         } else {
6126                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6127                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6128                         return -EEXIST;
6129                 }
6130                 if (nlh->nlmsg_flags & NLM_F_REPLACE)
6131                         return -EOPNOTSUPP;
6132
6133                 type = __nft_obj_type_get(objtype);
6134                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6135
6136                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6137         }
6138
6139         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6140
6141         type = nft_obj_type_get(net, objtype);
6142         if (IS_ERR(type))
6143                 return PTR_ERR(type);
6144
6145         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6146         if (IS_ERR(obj)) {
6147                 err = PTR_ERR(obj);
6148                 goto err_init;
6149         }
6150         obj->key.table = table;
6151         obj->handle = nf_tables_alloc_handle(table);
6152
6153         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6154         if (!obj->key.name) {
6155                 err = -ENOMEM;
6156                 goto err_strdup;
6157         }
6158
6159         if (nla[NFTA_OBJ_USERDATA]) {
6160                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6161                 if (obj->udata == NULL)
6162                         goto err_userdata;
6163
6164                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6165         }
6166
6167         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6168         if (err < 0)
6169                 goto err_trans;
6170
6171         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6172                               nft_objname_ht_params);
6173         if (err < 0)
6174                 goto err_obj_ht;
6175
6176         list_add_tail_rcu(&obj->list, &table->objects);
6177         table->use++;
6178         return 0;
6179 err_obj_ht:
6180         /* queued in transaction log */
6181         INIT_LIST_HEAD(&obj->list);
6182         return err;
6183 err_trans:
6184         kfree(obj->key.name);
6185 err_userdata:
6186         kfree(obj->udata);
6187 err_strdup:
6188         if (obj->ops->destroy)
6189                 obj->ops->destroy(&ctx, obj);
6190         kfree(obj);
6191 err_init:
6192         module_put(type->owner);
6193         return err;
6194 }
6195
6196 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6197                                    u32 portid, u32 seq, int event, u32 flags,
6198                                    int family, const struct nft_table *table,
6199                                    struct nft_object *obj, bool reset)
6200 {
6201         struct nfgenmsg *nfmsg;
6202         struct nlmsghdr *nlh;
6203
6204         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6205         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6206         if (nlh == NULL)
6207                 goto nla_put_failure;
6208
6209         nfmsg = nlmsg_data(nlh);
6210         nfmsg->nfgen_family     = family;
6211         nfmsg->version          = NFNETLINK_V0;
6212         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
6213
6214         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6215             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6216             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6217             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6218             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6219             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6220                          NFTA_OBJ_PAD))
6221                 goto nla_put_failure;
6222
6223         if (obj->udata &&
6224             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6225                 goto nla_put_failure;
6226
6227         nlmsg_end(skb, nlh);
6228         return 0;
6229
6230 nla_put_failure:
6231         nlmsg_trim(skb, nlh);
6232         return -1;
6233 }
6234
6235 struct nft_obj_filter {
6236         char            *table;
6237         u32             type;
6238 };
6239
6240 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6241 {
6242         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6243         const struct nft_table *table;
6244         unsigned int idx = 0, s_idx = cb->args[0];
6245         struct nft_obj_filter *filter = cb->data;
6246         struct net *net = sock_net(skb->sk);
6247         int family = nfmsg->nfgen_family;
6248         struct nft_object *obj;
6249         bool reset = false;
6250
6251         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6252                 reset = true;
6253
6254         rcu_read_lock();
6255         cb->seq = net->nft.base_seq;
6256
6257         list_for_each_entry_rcu(table, &net->nft.tables, list) {
6258                 if (family != NFPROTO_UNSPEC && family != table->family)
6259                         continue;
6260
6261                 list_for_each_entry_rcu(obj, &table->objects, list) {
6262                         if (!nft_is_active(net, obj))
6263                                 goto cont;
6264                         if (idx < s_idx)
6265                                 goto cont;
6266                         if (idx > s_idx)
6267                                 memset(&cb->args[1], 0,
6268                                        sizeof(cb->args) - sizeof(cb->args[0]));
6269                         if (filter && filter->table &&
6270                             strcmp(filter->table, table->name))
6271                                 goto cont;
6272                         if (filter &&
6273                             filter->type != NFT_OBJECT_UNSPEC &&
6274                             obj->ops->type->type != filter->type)
6275                                 goto cont;
6276
6277                         if (reset) {
6278                                 char *buf = kasprintf(GFP_ATOMIC,
6279                                                       "%s:%llu;?:0",
6280                                                       table->name,
6281                                                       table->handle);
6282
6283                                 audit_log_nfcfg(buf,
6284                                                 family,
6285                                                 obj->handle,
6286                                                 AUDIT_NFT_OP_OBJ_RESET,
6287                                                 GFP_ATOMIC);
6288                                 kfree(buf);
6289                         }
6290
6291                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6292                                                     cb->nlh->nlmsg_seq,
6293                                                     NFT_MSG_NEWOBJ,
6294                                                     NLM_F_MULTI | NLM_F_APPEND,
6295                                                     table->family, table,
6296                                                     obj, reset) < 0)
6297                                 goto done;
6298
6299                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6300 cont:
6301                         idx++;
6302                 }
6303         }
6304 done:
6305         rcu_read_unlock();
6306
6307         cb->args[0] = idx;
6308         return skb->len;
6309 }
6310
6311 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6312 {
6313         const struct nlattr * const *nla = cb->data;
6314         struct nft_obj_filter *filter = NULL;
6315
6316         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6317                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6318                 if (!filter)
6319                         return -ENOMEM;
6320
6321                 if (nla[NFTA_OBJ_TABLE]) {
6322                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6323                         if (!filter->table) {
6324                                 kfree(filter);
6325                                 return -ENOMEM;
6326                         }
6327                 }
6328
6329                 if (nla[NFTA_OBJ_TYPE])
6330                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6331         }
6332
6333         cb->data = filter;
6334         return 0;
6335 }
6336
6337 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6338 {
6339         struct nft_obj_filter *filter = cb->data;
6340
6341         if (filter) {
6342                 kfree(filter->table);
6343                 kfree(filter);
6344         }
6345
6346         return 0;
6347 }
6348
6349 /* called with rcu_read_lock held */
6350 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6351                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6352                             const struct nlattr * const nla[],
6353                             struct netlink_ext_ack *extack)
6354 {
6355         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6356         u8 genmask = nft_genmask_cur(net);
6357         int family = nfmsg->nfgen_family;
6358         const struct nft_table *table;
6359         struct nft_object *obj;
6360         struct sk_buff *skb2;
6361         bool reset = false;
6362         u32 objtype;
6363         int err;
6364
6365         if (nlh->nlmsg_flags & NLM_F_DUMP) {
6366                 struct netlink_dump_control c = {
6367                         .start = nf_tables_dump_obj_start,
6368                         .dump = nf_tables_dump_obj,
6369                         .done = nf_tables_dump_obj_done,
6370                         .module = THIS_MODULE,
6371                         .data = (void *)nla,
6372                 };
6373
6374                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6375         }
6376
6377         if (!nla[NFTA_OBJ_NAME] ||
6378             !nla[NFTA_OBJ_TYPE])
6379                 return -EINVAL;
6380
6381         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6382         if (IS_ERR(table)) {
6383                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6384                 return PTR_ERR(table);
6385         }
6386
6387         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6388         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6389         if (IS_ERR(obj)) {
6390                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6391                 return PTR_ERR(obj);
6392         }
6393
6394         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6395         if (!skb2)
6396                 return -ENOMEM;
6397
6398         if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6399                 reset = true;
6400
6401         if (reset) {
6402                 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6403                                       table->name, table->handle);
6404
6405                 audit_log_nfcfg(buf,
6406                                 family,
6407                                 obj->handle,
6408                                 AUDIT_NFT_OP_OBJ_RESET,
6409                                 GFP_ATOMIC);
6410                 kfree(buf);
6411         }
6412
6413         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6414                                       nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6415                                       family, table, obj, reset);
6416         if (err < 0)
6417                 goto err_fill_obj_info;
6418
6419         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6420
6421 err_fill_obj_info:
6422         kfree_skb(skb2);
6423         return err;
6424 }
6425
6426 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6427 {
6428         if (obj->ops->destroy)
6429                 obj->ops->destroy(ctx, obj);
6430
6431         module_put(obj->ops->type->owner);
6432         kfree(obj->key.name);
6433         kfree(obj->udata);
6434         kfree(obj);
6435 }
6436
6437 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6438                             struct sk_buff *skb, const struct nlmsghdr *nlh,
6439                             const struct nlattr * const nla[],
6440                             struct netlink_ext_ack *extack)
6441 {
6442         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6443         u8 genmask = nft_genmask_next(net);
6444         int family = nfmsg->nfgen_family;
6445         const struct nlattr *attr;
6446         struct nft_table *table;
6447         struct nft_object *obj;
6448         struct nft_ctx ctx;
6449         u32 objtype;
6450
6451         if (!nla[NFTA_OBJ_TYPE] ||
6452             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6453                 return -EINVAL;
6454
6455         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6456         if (IS_ERR(table)) {
6457                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6458                 return PTR_ERR(table);
6459         }
6460
6461         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6462         if (nla[NFTA_OBJ_HANDLE]) {
6463                 attr = nla[NFTA_OBJ_HANDLE];
6464                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6465         } else {
6466                 attr = nla[NFTA_OBJ_NAME];
6467                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6468         }
6469
6470         if (IS_ERR(obj)) {
6471                 NL_SET_BAD_ATTR(extack, attr);
6472                 return PTR_ERR(obj);
6473         }
6474         if (obj->use > 0) {
6475                 NL_SET_BAD_ATTR(extack, attr);
6476                 return -EBUSY;
6477         }
6478
6479         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6480
6481         return nft_delobj(&ctx, obj);
6482 }
6483
6484 void nft_obj_notify(struct net *net, const struct nft_table *table,
6485                     struct nft_object *obj, u32 portid, u32 seq, int event,
6486                     int family, int report, gfp_t gfp)
6487 {
6488         struct sk_buff *skb;
6489         int err;
6490         char *buf = kasprintf(gfp, "%s:%llu;?:0",
6491                               table->name, table->handle);
6492
6493         audit_log_nfcfg(buf,
6494                         family,
6495                         obj->handle,
6496                         event == NFT_MSG_NEWOBJ ?
6497                                 AUDIT_NFT_OP_OBJ_REGISTER :
6498                                 AUDIT_NFT_OP_OBJ_UNREGISTER,
6499                         gfp);
6500         kfree(buf);
6501
6502         if (!report &&
6503             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6504                 return;
6505
6506         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6507         if (skb == NULL)
6508                 goto err;
6509
6510         err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6511                                       table, obj, false);
6512         if (err < 0) {
6513                 kfree_skb(skb);
6514                 goto err;
6515         }
6516
6517         nft_notify_enqueue(skb, report, &net->nft.notify_list);
6518         return;
6519 err:
6520         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6521 }
6522 EXPORT_SYMBOL_GPL(nft_obj_notify);
6523
6524 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6525                                  struct nft_object *obj, int event)
6526 {
6527         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6528                        ctx->family, ctx->report, GFP_KERNEL);
6529 }
6530
6531 /*
6532  * Flow tables
6533  */
6534 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6535 {
6536         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6537         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6538         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6539 }
6540 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6541
6542 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6543 {
6544         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6545         list_del_rcu(&type->list);
6546         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6547 }
6548 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6549
6550 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6551         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
6552                                             .len = NFT_NAME_MAXLEN - 1 },
6553         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
6554                                             .len = NFT_NAME_MAXLEN - 1 },
6555         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
6556         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
6557         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
6558 };
6559
6560 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6561                                            const struct nlattr *nla, u8 genmask)
6562 {
6563         struct nft_flowtable *flowtable;
6564
6565         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6566                 if (!nla_strcmp(nla, flowtable->name) &&
6567                     nft_active_genmask(flowtable, genmask))
6568                         return flowtable;
6569         }
6570         return ERR_PTR(-ENOENT);
6571 }
6572 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6573
6574 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6575                                     struct nft_flowtable *flowtable,
6576                                     enum nft_trans_phase phase)
6577 {
6578         switch (phase) {
6579         case NFT_TRANS_PREPARE:
6580         case NFT_TRANS_ABORT:
6581         case NFT_TRANS_RELEASE:
6582                 flowtable->use--;
6583                 fallthrough;
6584         default:
6585                 return;
6586         }
6587 }
6588 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6589
6590 static struct nft_flowtable *
6591 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6592                               const struct nlattr *nla, u8 genmask)
6593 {
6594        struct nft_flowtable *flowtable;
6595
6596        list_for_each_entry(flowtable, &table->flowtables, list) {
6597                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6598                    nft_active_genmask(flowtable, genmask))
6599                        return flowtable;
6600        }
6601        return ERR_PTR(-ENOENT);
6602 }
6603
6604 struct nft_flowtable_hook {
6605         u32                     num;
6606         int                     priority;
6607         struct list_head        list;
6608 };
6609
6610 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6611         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
6612         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
6613         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
6614 };
6615
6616 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6617                                     const struct nlattr *attr,
6618                                     struct nft_flowtable_hook *flowtable_hook,
6619                                     struct nft_flowtable *flowtable, bool add)
6620 {
6621         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6622         struct nft_hook *hook;
6623         int hooknum, priority;
6624         int err;
6625
6626         INIT_LIST_HEAD(&flowtable_hook->list);
6627
6628         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6629                                           nft_flowtable_hook_policy, NULL);
6630         if (err < 0)
6631                 return err;
6632
6633         if (add) {
6634                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6635                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6636                         return -EINVAL;
6637
6638                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6639                 if (hooknum != NF_NETDEV_INGRESS)
6640                         return -EOPNOTSUPP;
6641
6642                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6643
6644                 flowtable_hook->priority        = priority;
6645                 flowtable_hook->num             = hooknum;
6646         } else {
6647                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6648                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6649                         if (hooknum != flowtable->hooknum)
6650                                 return -EOPNOTSUPP;
6651                 }
6652
6653                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6654                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6655                         if (priority != flowtable->data.priority)
6656                                 return -EOPNOTSUPP;
6657                 }
6658
6659                 flowtable_hook->priority        = flowtable->data.priority;
6660                 flowtable_hook->num             = flowtable->hooknum;
6661         }
6662
6663         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6664                 err = nf_tables_parse_netdev_hooks(ctx->net,
6665                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
6666                                                    &flowtable_hook->list);
6667                 if (err < 0)
6668                         return err;
6669         }
6670
6671         list_for_each_entry(hook, &flowtable_hook->list, list) {
6672                 hook->ops.pf            = NFPROTO_NETDEV;
6673                 hook->ops.hooknum       = flowtable_hook->num;
6674                 hook->ops.priority      = flowtable_hook->priority;
6675                 hook->ops.priv          = &flowtable->data;
6676                 hook->ops.hook          = flowtable->data.type->hook;
6677         }
6678
6679         return err;
6680 }
6681
6682 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6683 {
6684         const struct nf_flowtable_type *type;
6685
6686         list_for_each_entry(type, &nf_tables_flowtables, list) {
6687                 if (family == type->family)
6688                         return type;
6689         }
6690         return NULL;
6691 }
6692
6693 static const struct nf_flowtable_type *
6694 nft_flowtable_type_get(struct net *net, u8 family)
6695 {
6696         const struct nf_flowtable_type *type;
6697
6698         type = __nft_flowtable_type_get(family);
6699         if (type != NULL && try_module_get(type->owner))
6700                 return type;
6701
6702         lockdep_nfnl_nft_mutex_not_held();
6703 #ifdef CONFIG_MODULES
6704         if (type == NULL) {
6705                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6706                         return ERR_PTR(-EAGAIN);
6707         }
6708 #endif
6709         return ERR_PTR(-ENOENT);
6710 }
6711
6712 /* Only called from error and netdev event paths. */
6713 static void nft_unregister_flowtable_hook(struct net *net,
6714                                           struct nft_flowtable *flowtable,
6715                                           struct nft_hook *hook)
6716 {
6717         nf_unregister_net_hook(net, &hook->ops);
6718         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6719                                     FLOW_BLOCK_UNBIND);
6720 }
6721
6722 static void nft_unregister_flowtable_net_hooks(struct net *net,
6723                                                struct list_head *hook_list)
6724 {
6725         struct nft_hook *hook;
6726
6727         list_for_each_entry(hook, hook_list, list)
6728                 nf_unregister_net_hook(net, &hook->ops);
6729 }
6730
6731 static int nft_register_flowtable_net_hooks(struct net *net,
6732                                             struct nft_table *table,
6733                                             struct list_head *hook_list,
6734                                             struct nft_flowtable *flowtable)
6735 {
6736         struct nft_hook *hook, *hook2, *next;
6737         struct nft_flowtable *ft;
6738         int err, i = 0;
6739
6740         list_for_each_entry(hook, hook_list, list) {
6741                 list_for_each_entry(ft, &table->flowtables, list) {
6742                         list_for_each_entry(hook2, &ft->hook_list, list) {
6743                                 if (hook->ops.dev == hook2->ops.dev &&
6744                                     hook->ops.pf == hook2->ops.pf) {
6745                                         err = -EEXIST;
6746                                         goto err_unregister_net_hooks;
6747                                 }
6748                         }
6749                 }
6750
6751                 err = flowtable->data.type->setup(&flowtable->data,
6752                                                   hook->ops.dev,
6753                                                   FLOW_BLOCK_BIND);
6754                 if (err < 0)
6755                         goto err_unregister_net_hooks;
6756
6757                 err = nf_register_net_hook(net, &hook->ops);
6758                 if (err < 0) {
6759                         flowtable->data.type->setup(&flowtable->data,
6760                                                     hook->ops.dev,
6761                                                     FLOW_BLOCK_UNBIND);
6762                         goto err_unregister_net_hooks;
6763                 }
6764
6765                 i++;
6766         }
6767
6768         return 0;
6769
6770 err_unregister_net_hooks:
6771         list_for_each_entry_safe(hook, next, hook_list, list) {
6772                 if (i-- <= 0)
6773                         break;
6774
6775                 nft_unregister_flowtable_hook(net, flowtable, hook);
6776                 list_del_rcu(&hook->list);
6777                 kfree_rcu(hook, rcu);
6778         }
6779
6780         return err;
6781 }
6782
6783 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6784 {
6785         struct nft_hook *hook, *next;
6786
6787         list_for_each_entry_safe(hook, next, hook_list, list) {
6788                 list_del_rcu(&hook->list);
6789                 kfree_rcu(hook, rcu);
6790         }
6791 }
6792
6793 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6794                                 struct nft_flowtable *flowtable)
6795 {
6796         const struct nlattr * const *nla = ctx->nla;
6797         struct nft_flowtable_hook flowtable_hook;
6798         struct nft_hook *hook, *next;
6799         struct nft_trans *trans;
6800         bool unregister = false;
6801         int err;
6802
6803         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6804                                        &flowtable_hook, flowtable, false);
6805         if (err < 0)
6806                 return err;
6807
6808         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6809                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6810                         list_del(&hook->list);
6811                         kfree(hook);
6812                 }
6813         }
6814
6815         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6816                                                &flowtable_hook.list, flowtable);
6817         if (err < 0)
6818                 goto err_flowtable_update_hook;
6819
6820         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6821                                 sizeof(struct nft_trans_flowtable));
6822         if (!trans) {
6823                 unregister = true;
6824                 err = -ENOMEM;
6825                 goto err_flowtable_update_hook;
6826         }
6827
6828         nft_trans_flowtable(trans) = flowtable;
6829         nft_trans_flowtable_update(trans) = true;
6830         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6831         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6832
6833         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6834
6835         return 0;
6836
6837 err_flowtable_update_hook:
6838         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6839                 if (unregister)
6840                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6841                 list_del_rcu(&hook->list);
6842                 kfree_rcu(hook, rcu);
6843         }
6844
6845         return err;
6846
6847 }
6848
6849 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6850                                   struct sk_buff *skb,
6851                                   const struct nlmsghdr *nlh,
6852                                   const struct nlattr * const nla[],
6853                                   struct netlink_ext_ack *extack)
6854 {
6855         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6856         struct nft_flowtable_hook flowtable_hook;
6857         const struct nf_flowtable_type *type;
6858         u8 genmask = nft_genmask_next(net);
6859         int family = nfmsg->nfgen_family;
6860         struct nft_flowtable *flowtable;
6861         struct nft_hook *hook, *next;
6862         struct nft_table *table;
6863         struct nft_ctx ctx;
6864         int err;
6865
6866         if (!nla[NFTA_FLOWTABLE_TABLE] ||
6867             !nla[NFTA_FLOWTABLE_NAME] ||
6868             !nla[NFTA_FLOWTABLE_HOOK])
6869                 return -EINVAL;
6870
6871         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6872                                  genmask);
6873         if (IS_ERR(table)) {
6874                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6875                 return PTR_ERR(table);
6876         }
6877
6878         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6879                                          genmask);
6880         if (IS_ERR(flowtable)) {
6881                 err = PTR_ERR(flowtable);
6882                 if (err != -ENOENT) {
6883                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6884                         return err;
6885                 }
6886         } else {
6887                 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6888                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6889                         return -EEXIST;
6890                 }
6891
6892                 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6893
6894                 return nft_flowtable_update(&ctx, nlh, flowtable);
6895         }
6896
6897         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6898
6899         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6900         if (!flowtable)
6901                 return -ENOMEM;
6902
6903         flowtable->table = table;
6904         flowtable->handle = nf_tables_alloc_handle(table);
6905         INIT_LIST_HEAD(&flowtable->hook_list);
6906
6907         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6908         if (!flowtable->name) {
6909                 err = -ENOMEM;
6910                 goto err1;
6911         }
6912
6913         type = nft_flowtable_type_get(net, family);
6914         if (IS_ERR(type)) {
6915                 err = PTR_ERR(type);
6916                 goto err2;
6917         }
6918
6919         if (nla[NFTA_FLOWTABLE_FLAGS]) {
6920                 flowtable->data.flags =
6921                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6922                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6923                         goto err3;
6924         }
6925
6926         write_pnet(&flowtable->data.net, net);
6927         flowtable->data.type = type;
6928         err = type->init(&flowtable->data);
6929         if (err < 0)
6930                 goto err3;
6931
6932         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6933                                        &flowtable_hook, flowtable, true);
6934         if (err < 0)
6935                 goto err4;
6936
6937         list_splice(&flowtable_hook.list, &flowtable->hook_list);
6938         flowtable->data.priority = flowtable_hook.priority;
6939         flowtable->hooknum = flowtable_hook.num;
6940
6941         err = nft_register_flowtable_net_hooks(ctx.net, table,
6942                                                &flowtable->hook_list,
6943                                                flowtable);
6944         if (err < 0) {
6945                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6946                 goto err4;
6947         }
6948
6949         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6950         if (err < 0)
6951                 goto err5;
6952
6953         list_add_tail_rcu(&flowtable->list, &table->flowtables);
6954         table->use++;
6955
6956         return 0;
6957 err5:
6958         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6959                 nft_unregister_flowtable_hook(net, flowtable, hook);
6960                 list_del_rcu(&hook->list);
6961                 kfree_rcu(hook, rcu);
6962         }
6963 err4:
6964         flowtable->data.type->free(&flowtable->data);
6965 err3:
6966         module_put(type->owner);
6967 err2:
6968         kfree(flowtable->name);
6969 err1:
6970         kfree(flowtable);
6971         return err;
6972 }
6973
6974 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6975 {
6976         struct nft_hook *this, *next;
6977
6978         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6979                 list_del(&this->list);
6980                 kfree(this);
6981         }
6982 }
6983
6984 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6985                                  struct nft_flowtable *flowtable)
6986 {
6987         const struct nlattr * const *nla = ctx->nla;
6988         struct nft_flowtable_hook flowtable_hook;
6989         struct nft_hook *this, *hook;
6990         struct nft_trans *trans;
6991         int err;
6992
6993         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6994                                        &flowtable_hook, flowtable, false);
6995         if (err < 0)
6996                 return err;
6997
6998         list_for_each_entry(this, &flowtable_hook.list, list) {
6999                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7000                 if (!hook) {
7001                         err = -ENOENT;
7002                         goto err_flowtable_del_hook;
7003                 }
7004                 hook->inactive = true;
7005         }
7006
7007         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7008                                 sizeof(struct nft_trans_flowtable));
7009         if (!trans) {
7010                 err = -ENOMEM;
7011                 goto err_flowtable_del_hook;
7012         }
7013
7014         nft_trans_flowtable(trans) = flowtable;
7015         nft_trans_flowtable_update(trans) = true;
7016         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7017         nft_flowtable_hook_release(&flowtable_hook);
7018
7019         list_add_tail(&trans->list, &ctx->net->nft.commit_list);
7020
7021         return 0;
7022
7023 err_flowtable_del_hook:
7024         list_for_each_entry(this, &flowtable_hook.list, list) {
7025                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7026                 if (!hook)
7027                         break;
7028
7029                 hook->inactive = false;
7030         }
7031         nft_flowtable_hook_release(&flowtable_hook);
7032
7033         return err;
7034 }
7035
7036 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
7037                                   struct sk_buff *skb,
7038                                   const struct nlmsghdr *nlh,
7039                                   const struct nlattr * const nla[],
7040                                   struct netlink_ext_ack *extack)
7041 {
7042         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7043         u8 genmask = nft_genmask_next(net);
7044         int family = nfmsg->nfgen_family;
7045         struct nft_flowtable *flowtable;
7046         const struct nlattr *attr;
7047         struct nft_table *table;
7048         struct nft_ctx ctx;
7049
7050         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7051             (!nla[NFTA_FLOWTABLE_NAME] &&
7052              !nla[NFTA_FLOWTABLE_HANDLE]))
7053                 return -EINVAL;
7054
7055         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7056                                  genmask);
7057         if (IS_ERR(table)) {
7058                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7059                 return PTR_ERR(table);
7060         }
7061
7062         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7063                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7064                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7065         } else {
7066                 attr = nla[NFTA_FLOWTABLE_NAME];
7067                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7068         }
7069
7070         if (IS_ERR(flowtable)) {
7071                 NL_SET_BAD_ATTR(extack, attr);
7072                 return PTR_ERR(flowtable);
7073         }
7074
7075         nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
7076
7077         if (nla[NFTA_FLOWTABLE_HOOK])
7078                 return nft_delflowtable_hook(&ctx, flowtable);
7079
7080         if (flowtable->use > 0) {
7081                 NL_SET_BAD_ATTR(extack, attr);
7082                 return -EBUSY;
7083         }
7084
7085         return nft_delflowtable(&ctx, flowtable);
7086 }
7087
7088 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7089                                          u32 portid, u32 seq, int event,
7090                                          u32 flags, int family,
7091                                          struct nft_flowtable *flowtable,
7092                                          struct list_head *hook_list)
7093 {
7094         struct nlattr *nest, *nest_devs;
7095         struct nfgenmsg *nfmsg;
7096         struct nft_hook *hook;
7097         struct nlmsghdr *nlh;
7098
7099         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7100         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
7101         if (nlh == NULL)
7102                 goto nla_put_failure;
7103
7104         nfmsg = nlmsg_data(nlh);
7105         nfmsg->nfgen_family     = family;
7106         nfmsg->version          = NFNETLINK_V0;
7107         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7108
7109         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7110             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7111             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7112             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7113                          NFTA_FLOWTABLE_PAD) ||
7114             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7115                 goto nla_put_failure;
7116
7117         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7118         if (!nest)
7119                 goto nla_put_failure;
7120         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7121             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7122                 goto nla_put_failure;
7123
7124         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7125         if (!nest_devs)
7126                 goto nla_put_failure;
7127
7128         list_for_each_entry_rcu(hook, hook_list, list) {
7129                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7130                         goto nla_put_failure;
7131         }
7132         nla_nest_end(skb, nest_devs);
7133         nla_nest_end(skb, nest);
7134
7135         nlmsg_end(skb, nlh);
7136         return 0;
7137
7138 nla_put_failure:
7139         nlmsg_trim(skb, nlh);
7140         return -1;
7141 }
7142
7143 struct nft_flowtable_filter {
7144         char            *table;
7145 };
7146
7147 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7148                                     struct netlink_callback *cb)
7149 {
7150         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7151         struct nft_flowtable_filter *filter = cb->data;
7152         unsigned int idx = 0, s_idx = cb->args[0];
7153         struct net *net = sock_net(skb->sk);
7154         int family = nfmsg->nfgen_family;
7155         struct nft_flowtable *flowtable;
7156         const struct nft_table *table;
7157
7158         rcu_read_lock();
7159         cb->seq = net->nft.base_seq;
7160
7161         list_for_each_entry_rcu(table, &net->nft.tables, list) {
7162                 if (family != NFPROTO_UNSPEC && family != table->family)
7163                         continue;
7164
7165                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7166                         if (!nft_is_active(net, flowtable))
7167                                 goto cont;
7168                         if (idx < s_idx)
7169                                 goto cont;
7170                         if (idx > s_idx)
7171                                 memset(&cb->args[1], 0,
7172                                        sizeof(cb->args) - sizeof(cb->args[0]));
7173                         if (filter && filter->table &&
7174                             strcmp(filter->table, table->name))
7175                                 goto cont;
7176
7177                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7178                                                           cb->nlh->nlmsg_seq,
7179                                                           NFT_MSG_NEWFLOWTABLE,
7180                                                           NLM_F_MULTI | NLM_F_APPEND,
7181                                                           table->family,
7182                                                           flowtable,
7183                                                           &flowtable->hook_list) < 0)
7184                                 goto done;
7185
7186                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7187 cont:
7188                         idx++;
7189                 }
7190         }
7191 done:
7192         rcu_read_unlock();
7193
7194         cb->args[0] = idx;
7195         return skb->len;
7196 }
7197
7198 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7199 {
7200         const struct nlattr * const *nla = cb->data;
7201         struct nft_flowtable_filter *filter = NULL;
7202
7203         if (nla[NFTA_FLOWTABLE_TABLE]) {
7204                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7205                 if (!filter)
7206                         return -ENOMEM;
7207
7208                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7209                                            GFP_ATOMIC);
7210                 if (!filter->table) {
7211                         kfree(filter);
7212                         return -ENOMEM;
7213                 }
7214         }
7215
7216         cb->data = filter;
7217         return 0;
7218 }
7219
7220 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7221 {
7222         struct nft_flowtable_filter *filter = cb->data;
7223
7224         if (!filter)
7225                 return 0;
7226
7227         kfree(filter->table);
7228         kfree(filter);
7229
7230         return 0;
7231 }
7232
7233 /* called with rcu_read_lock held */
7234 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7235                                   struct sk_buff *skb,
7236                                   const struct nlmsghdr *nlh,
7237                                   const struct nlattr * const nla[],
7238                                   struct netlink_ext_ack *extack)
7239 {
7240         const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7241         u8 genmask = nft_genmask_cur(net);
7242         int family = nfmsg->nfgen_family;
7243         struct nft_flowtable *flowtable;
7244         const struct nft_table *table;
7245         struct sk_buff *skb2;
7246         int err;
7247
7248         if (nlh->nlmsg_flags & NLM_F_DUMP) {
7249                 struct netlink_dump_control c = {
7250                         .start = nf_tables_dump_flowtable_start,
7251                         .dump = nf_tables_dump_flowtable,
7252                         .done = nf_tables_dump_flowtable_done,
7253                         .module = THIS_MODULE,
7254                         .data = (void *)nla,
7255                 };
7256
7257                 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7258         }
7259
7260         if (!nla[NFTA_FLOWTABLE_NAME])
7261                 return -EINVAL;
7262
7263         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7264                                  genmask);
7265         if (IS_ERR(table))
7266                 return PTR_ERR(table);
7267
7268         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7269                                          genmask);
7270         if (IS_ERR(flowtable))
7271                 return PTR_ERR(flowtable);
7272
7273         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7274         if (!skb2)
7275                 return -ENOMEM;
7276
7277         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7278                                             nlh->nlmsg_seq,
7279                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7280                                             flowtable, &flowtable->hook_list);
7281         if (err < 0)
7282                 goto err_fill_flowtable_info;
7283
7284         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7285
7286 err_fill_flowtable_info:
7287         kfree_skb(skb2);
7288         return err;
7289 }
7290
7291 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7292                                        struct nft_flowtable *flowtable,
7293                                        struct list_head *hook_list,
7294                                        int event)
7295 {
7296         struct sk_buff *skb;
7297         int err;
7298         char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7299                               flowtable->table->name, flowtable->table->handle,
7300                               flowtable->name, flowtable->handle);
7301
7302         audit_log_nfcfg(buf,
7303                         ctx->family,
7304                         flowtable->hooknum,
7305                         event == NFT_MSG_NEWFLOWTABLE ?
7306                                 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7307                                 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7308                         GFP_KERNEL);
7309         kfree(buf);
7310
7311         if (!ctx->report &&
7312             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7313                 return;
7314
7315         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7316         if (skb == NULL)
7317                 goto err;
7318
7319         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7320                                             ctx->seq, event, 0,
7321                                             ctx->family, flowtable, hook_list);
7322         if (err < 0) {
7323                 kfree_skb(skb);
7324                 goto err;
7325         }
7326
7327         nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7328         return;
7329 err:
7330         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7331 }
7332
7333 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7334 {
7335         struct nft_hook *hook, *next;
7336
7337         flowtable->data.type->free(&flowtable->data);
7338         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7339                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7340                                             FLOW_BLOCK_UNBIND);
7341                 list_del_rcu(&hook->list);
7342                 kfree(hook);
7343         }
7344         kfree(flowtable->name);
7345         module_put(flowtable->data.type->owner);
7346         kfree(flowtable);
7347 }
7348
7349 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7350                                    u32 portid, u32 seq)
7351 {
7352         struct nlmsghdr *nlh;
7353         struct nfgenmsg *nfmsg;
7354         char buf[TASK_COMM_LEN];
7355         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7356
7357         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7358         if (nlh == NULL)
7359                 goto nla_put_failure;
7360
7361         nfmsg = nlmsg_data(nlh);
7362         nfmsg->nfgen_family     = AF_UNSPEC;
7363         nfmsg->version          = NFNETLINK_V0;
7364         nfmsg->res_id           = htons(net->nft.base_seq & 0xffff);
7365
7366         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7367             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7368             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7369                 goto nla_put_failure;
7370
7371         nlmsg_end(skb, nlh);
7372         return 0;
7373
7374 nla_put_failure:
7375         nlmsg_trim(skb, nlh);
7376         return -EMSGSIZE;
7377 }
7378
7379 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7380                                 struct nft_flowtable *flowtable)
7381 {
7382         struct nft_hook *hook;
7383
7384         list_for_each_entry(hook, &flowtable->hook_list, list) {
7385                 if (hook->ops.dev != dev)
7386                         continue;
7387
7388                 /* flow_offload_netdev_event() cleans up entries for us. */
7389                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7390                 list_del_rcu(&hook->list);
7391                 kfree_rcu(hook, rcu);
7392                 break;
7393         }
7394 }
7395
7396 static int nf_tables_flowtable_event(struct notifier_block *this,
7397                                      unsigned long event, void *ptr)
7398 {
7399         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7400         struct nft_flowtable *flowtable;
7401         struct nft_table *table;
7402         struct net *net;
7403
7404         if (event != NETDEV_UNREGISTER)
7405                 return 0;
7406
7407         net = dev_net(dev);
7408         mutex_lock(&net->nft.commit_mutex);
7409         list_for_each_entry(table, &net->nft.tables, list) {
7410                 list_for_each_entry(flowtable, &table->flowtables, list) {
7411                         nft_flowtable_event(event, dev, flowtable);
7412                 }
7413         }
7414         mutex_unlock(&net->nft.commit_mutex);
7415
7416         return NOTIFY_DONE;
7417 }
7418
7419 static struct notifier_block nf_tables_flowtable_notifier = {
7420         .notifier_call  = nf_tables_flowtable_event,
7421 };
7422
7423 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7424                                  int event)
7425 {
7426         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7427         struct sk_buff *skb2;
7428         int err;
7429
7430         audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7431                         AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7432
7433         if (!nlmsg_report(nlh) &&
7434             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7435                 return;
7436
7437         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7438         if (skb2 == NULL)
7439                 goto err;
7440
7441         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7442                                       nlh->nlmsg_seq);
7443         if (err < 0) {
7444                 kfree_skb(skb2);
7445                 goto err;
7446         }
7447
7448         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7449                        nlmsg_report(nlh), GFP_KERNEL);
7450         return;
7451 err:
7452         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7453                           -ENOBUFS);
7454 }
7455
7456 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7457                             struct sk_buff *skb, const struct nlmsghdr *nlh,
7458                             const struct nlattr * const nla[],
7459                             struct netlink_ext_ack *extack)
7460 {
7461         struct sk_buff *skb2;
7462         int err;
7463
7464         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7465         if (skb2 == NULL)
7466                 return -ENOMEM;
7467
7468         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7469                                       nlh->nlmsg_seq);
7470         if (err < 0)
7471                 goto err_fill_gen_info;
7472
7473         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7474
7475 err_fill_gen_info:
7476         kfree_skb(skb2);
7477         return err;
7478 }
7479
7480 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7481         [NFT_MSG_NEWTABLE] = {
7482                 .call_batch     = nf_tables_newtable,
7483                 .attr_count     = NFTA_TABLE_MAX,
7484                 .policy         = nft_table_policy,
7485         },
7486         [NFT_MSG_GETTABLE] = {
7487                 .call_rcu       = nf_tables_gettable,
7488                 .attr_count     = NFTA_TABLE_MAX,
7489                 .policy         = nft_table_policy,
7490         },
7491         [NFT_MSG_DELTABLE] = {
7492                 .call_batch     = nf_tables_deltable,
7493                 .attr_count     = NFTA_TABLE_MAX,
7494                 .policy         = nft_table_policy,
7495         },
7496         [NFT_MSG_NEWCHAIN] = {
7497                 .call_batch     = nf_tables_newchain,
7498                 .attr_count     = NFTA_CHAIN_MAX,
7499                 .policy         = nft_chain_policy,
7500         },
7501         [NFT_MSG_GETCHAIN] = {
7502                 .call_rcu       = nf_tables_getchain,
7503                 .attr_count     = NFTA_CHAIN_MAX,
7504                 .policy         = nft_chain_policy,
7505         },
7506         [NFT_MSG_DELCHAIN] = {
7507                 .call_batch     = nf_tables_delchain,
7508                 .attr_count     = NFTA_CHAIN_MAX,
7509                 .policy         = nft_chain_policy,
7510         },
7511         [NFT_MSG_NEWRULE] = {
7512                 .call_batch     = nf_tables_newrule,
7513                 .attr_count     = NFTA_RULE_MAX,
7514                 .policy         = nft_rule_policy,
7515         },
7516         [NFT_MSG_GETRULE] = {
7517                 .call_rcu       = nf_tables_getrule,
7518                 .attr_count     = NFTA_RULE_MAX,
7519                 .policy         = nft_rule_policy,
7520         },
7521         [NFT_MSG_DELRULE] = {
7522                 .call_batch     = nf_tables_delrule,
7523                 .attr_count     = NFTA_RULE_MAX,
7524                 .policy         = nft_rule_policy,
7525         },
7526         [NFT_MSG_NEWSET] = {
7527                 .call_batch     = nf_tables_newset,
7528                 .attr_count     = NFTA_SET_MAX,
7529                 .policy         = nft_set_policy,
7530         },
7531         [NFT_MSG_GETSET] = {
7532                 .call_rcu       = nf_tables_getset,
7533                 .attr_count     = NFTA_SET_MAX,
7534                 .policy         = nft_set_policy,
7535         },
7536         [NFT_MSG_DELSET] = {
7537                 .call_batch     = nf_tables_delset,
7538                 .attr_count     = NFTA_SET_MAX,
7539                 .policy         = nft_set_policy,
7540         },
7541         [NFT_MSG_NEWSETELEM] = {
7542                 .call_batch     = nf_tables_newsetelem,
7543                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7544                 .policy         = nft_set_elem_list_policy,
7545         },
7546         [NFT_MSG_GETSETELEM] = {
7547                 .call_rcu       = nf_tables_getsetelem,
7548                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7549                 .policy         = nft_set_elem_list_policy,
7550         },
7551         [NFT_MSG_DELSETELEM] = {
7552                 .call_batch     = nf_tables_delsetelem,
7553                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
7554                 .policy         = nft_set_elem_list_policy,
7555         },
7556         [NFT_MSG_GETGEN] = {
7557                 .call_rcu       = nf_tables_getgen,
7558         },
7559         [NFT_MSG_NEWOBJ] = {
7560                 .call_batch     = nf_tables_newobj,
7561                 .attr_count     = NFTA_OBJ_MAX,
7562                 .policy         = nft_obj_policy,
7563         },
7564         [NFT_MSG_GETOBJ] = {
7565                 .call_rcu       = nf_tables_getobj,
7566                 .attr_count     = NFTA_OBJ_MAX,
7567                 .policy         = nft_obj_policy,
7568         },
7569         [NFT_MSG_DELOBJ] = {
7570                 .call_batch     = nf_tables_delobj,
7571                 .attr_count     = NFTA_OBJ_MAX,
7572                 .policy         = nft_obj_policy,
7573         },
7574         [NFT_MSG_GETOBJ_RESET] = {
7575                 .call_rcu       = nf_tables_getobj,
7576                 .attr_count     = NFTA_OBJ_MAX,
7577                 .policy         = nft_obj_policy,
7578         },
7579         [NFT_MSG_NEWFLOWTABLE] = {
7580                 .call_batch     = nf_tables_newflowtable,
7581                 .attr_count     = NFTA_FLOWTABLE_MAX,
7582                 .policy         = nft_flowtable_policy,
7583         },
7584         [NFT_MSG_GETFLOWTABLE] = {
7585                 .call_rcu       = nf_tables_getflowtable,
7586                 .attr_count     = NFTA_FLOWTABLE_MAX,
7587                 .policy         = nft_flowtable_policy,
7588         },
7589         [NFT_MSG_DELFLOWTABLE] = {
7590                 .call_batch     = nf_tables_delflowtable,
7591                 .attr_count     = NFTA_FLOWTABLE_MAX,
7592                 .policy         = nft_flowtable_policy,
7593         },
7594 };
7595
7596 static int nf_tables_validate(struct net *net)
7597 {
7598         struct nft_table *table;
7599
7600         switch (net->nft.validate_state) {
7601         case NFT_VALIDATE_SKIP:
7602                 break;
7603         case NFT_VALIDATE_NEED:
7604                 nft_validate_state_update(net, NFT_VALIDATE_DO);
7605                 fallthrough;
7606         case NFT_VALIDATE_DO:
7607                 list_for_each_entry(table, &net->nft.tables, list) {
7608                         if (nft_table_validate(net, table) < 0)
7609                                 return -EAGAIN;
7610                 }
7611                 break;
7612         }
7613
7614         return 0;
7615 }
7616
7617 /* a drop policy has to be deferred until all rules have been activated,
7618  * otherwise a large ruleset that contains a drop-policy base chain will
7619  * cause all packets to get dropped until the full transaction has been
7620  * processed.
7621  *
7622  * We defer the drop policy until the transaction has been finalized.
7623  */
7624 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7625 {
7626         struct nft_base_chain *basechain;
7627
7628         if (nft_trans_chain_policy(trans) != NF_DROP)
7629                 return;
7630
7631         if (!nft_is_base_chain(trans->ctx.chain))
7632                 return;
7633
7634         basechain = nft_base_chain(trans->ctx.chain);
7635         basechain->policy = NF_DROP;
7636 }
7637
7638 static void nft_chain_commit_update(struct nft_trans *trans)
7639 {
7640         struct nft_base_chain *basechain;
7641
7642         if (nft_trans_chain_name(trans)) {
7643                 rhltable_remove(&trans->ctx.table->chains_ht,
7644                                 &trans->ctx.chain->rhlhead,
7645                                 nft_chain_ht_params);
7646                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7647                 rhltable_insert_key(&trans->ctx.table->chains_ht,
7648                                     trans->ctx.chain->name,
7649                                     &trans->ctx.chain->rhlhead,
7650                                     nft_chain_ht_params);
7651         }
7652
7653         if (!nft_is_base_chain(trans->ctx.chain))
7654                 return;
7655
7656         nft_chain_stats_replace(trans);
7657
7658         basechain = nft_base_chain(trans->ctx.chain);
7659
7660         switch (nft_trans_chain_policy(trans)) {
7661         case NF_DROP:
7662         case NF_ACCEPT:
7663                 basechain->policy = nft_trans_chain_policy(trans);
7664                 break;
7665         }
7666 }
7667
7668 static void nft_obj_commit_update(struct nft_trans *trans)
7669 {
7670         struct nft_object *newobj;
7671         struct nft_object *obj;
7672
7673         obj = nft_trans_obj(trans);
7674         newobj = nft_trans_obj_newobj(trans);
7675
7676         if (obj->ops->update)
7677                 obj->ops->update(obj, newobj);
7678
7679         kfree(newobj);
7680 }
7681
7682 static void nft_commit_release(struct nft_trans *trans)
7683 {
7684         switch (trans->msg_type) {
7685         case NFT_MSG_DELTABLE:
7686                 nf_tables_table_destroy(&trans->ctx);
7687                 break;
7688         case NFT_MSG_NEWCHAIN:
7689                 free_percpu(nft_trans_chain_stats(trans));
7690                 kfree(nft_trans_chain_name(trans));
7691                 break;
7692         case NFT_MSG_DELCHAIN:
7693                 nf_tables_chain_destroy(&trans->ctx);
7694                 break;
7695         case NFT_MSG_DELRULE:
7696                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7697                 break;
7698         case NFT_MSG_DELSET:
7699                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7700                 break;
7701         case NFT_MSG_DELSETELEM:
7702                 nf_tables_set_elem_destroy(&trans->ctx,
7703                                            nft_trans_elem_set(trans),
7704                                            nft_trans_elem(trans).priv);
7705                 break;
7706         case NFT_MSG_DELOBJ:
7707                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7708                 break;
7709         case NFT_MSG_DELFLOWTABLE:
7710                 if (nft_trans_flowtable_update(trans))
7711                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7712                 else
7713                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7714                 break;
7715         }
7716
7717         if (trans->put_net)
7718                 put_net(trans->ctx.net);
7719
7720         kfree(trans);
7721 }
7722
7723 static void nf_tables_trans_destroy_work(struct work_struct *w)
7724 {
7725         struct nft_trans *trans, *next;
7726         LIST_HEAD(head);
7727
7728         spin_lock(&nf_tables_destroy_list_lock);
7729         list_splice_init(&nf_tables_destroy_list, &head);
7730         spin_unlock(&nf_tables_destroy_list_lock);
7731
7732         if (list_empty(&head))
7733                 return;
7734
7735         synchronize_rcu();
7736
7737         list_for_each_entry_safe(trans, next, &head, list) {
7738                 list_del(&trans->list);
7739                 nft_commit_release(trans);
7740         }
7741 }
7742
7743 void nf_tables_trans_destroy_flush_work(void)
7744 {
7745         flush_work(&trans_destroy_work);
7746 }
7747 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7748
7749 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7750 {
7751         struct nft_rule *rule;
7752         unsigned int alloc = 0;
7753         int i;
7754
7755         /* already handled or inactive chain? */
7756         if (chain->rules_next || !nft_is_active_next(net, chain))
7757                 return 0;
7758
7759         rule = list_entry(&chain->rules, struct nft_rule, list);
7760         i = 0;
7761
7762         list_for_each_entry_continue(rule, &chain->rules, list) {
7763                 if (nft_is_active_next(net, rule))
7764                         alloc++;
7765         }
7766
7767         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7768         if (!chain->rules_next)
7769                 return -ENOMEM;
7770
7771         list_for_each_entry_continue(rule, &chain->rules, list) {
7772                 if (nft_is_active_next(net, rule))
7773                         chain->rules_next[i++] = rule;
7774         }
7775
7776         chain->rules_next[i] = NULL;
7777         return 0;
7778 }
7779
7780 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7781 {
7782         struct nft_trans *trans, *next;
7783
7784         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7785                 struct nft_chain *chain = trans->ctx.chain;
7786
7787                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7788                     trans->msg_type == NFT_MSG_DELRULE) {
7789                         kvfree(chain->rules_next);
7790                         chain->rules_next = NULL;
7791                 }
7792         }
7793 }
7794
7795 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7796 {
7797         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7798
7799         kvfree(o->start);
7800 }
7801
7802 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7803 {
7804         struct nft_rule **r = rules;
7805         struct nft_rules_old *old;
7806
7807         while (*r)
7808                 r++;
7809
7810         r++;    /* rcu_head is after end marker */
7811         old = (void *) r;
7812         old->start = rules;
7813
7814         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7815 }
7816
7817 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7818 {
7819         struct nft_rule **g0, **g1;
7820         bool next_genbit;
7821
7822         next_genbit = nft_gencursor_next(net);
7823
7824         g0 = rcu_dereference_protected(chain->rules_gen_0,
7825                                        lockdep_commit_lock_is_held(net));
7826         g1 = rcu_dereference_protected(chain->rules_gen_1,
7827                                        lockdep_commit_lock_is_held(net));
7828
7829         /* No changes to this chain? */
7830         if (chain->rules_next == NULL) {
7831                 /* chain had no change in last or next generation */
7832                 if (g0 == g1)
7833                         return;
7834                 /*
7835                  * chain had no change in this generation; make sure next
7836                  * one uses same rules as current generation.
7837                  */
7838                 if (next_genbit) {
7839                         rcu_assign_pointer(chain->rules_gen_1, g0);
7840                         nf_tables_commit_chain_free_rules_old(g1);
7841                 } else {
7842                         rcu_assign_pointer(chain->rules_gen_0, g1);
7843                         nf_tables_commit_chain_free_rules_old(g0);
7844                 }
7845
7846                 return;
7847         }
7848
7849         if (next_genbit)
7850                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7851         else
7852                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7853
7854         chain->rules_next = NULL;
7855
7856         if (g0 == g1)
7857                 return;
7858
7859         if (next_genbit)
7860                 nf_tables_commit_chain_free_rules_old(g1);
7861         else
7862                 nf_tables_commit_chain_free_rules_old(g0);
7863 }
7864
7865 static void nft_obj_del(struct nft_object *obj)
7866 {
7867         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7868         list_del_rcu(&obj->list);
7869 }
7870
7871 void nft_chain_del(struct nft_chain *chain)
7872 {
7873         struct nft_table *table = chain->table;
7874
7875         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7876                                      nft_chain_ht_params));
7877         list_del_rcu(&chain->list);
7878 }
7879
7880 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7881                                     struct list_head *hook_list)
7882 {
7883         struct nft_hook *hook, *next;
7884
7885         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7886                 if (hook->inactive)
7887                         list_move(&hook->list, hook_list);
7888         }
7889 }
7890
7891 static void nf_tables_module_autoload_cleanup(struct net *net)
7892 {
7893         struct nft_module_request *req, *next;
7894
7895         WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7896         list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7897                 WARN_ON_ONCE(!req->done);
7898                 list_del(&req->list);
7899                 kfree(req);
7900         }
7901 }
7902
7903 static void nf_tables_commit_release(struct net *net)
7904 {
7905         struct nft_trans *trans;
7906
7907         /* all side effects have to be made visible.
7908          * For example, if a chain named 'foo' has been deleted, a
7909          * new transaction must not find it anymore.
7910          *
7911          * Memory reclaim happens asynchronously from work queue
7912          * to prevent expensive synchronize_rcu() in commit phase.
7913          */
7914         if (list_empty(&net->nft.commit_list)) {
7915                 nf_tables_module_autoload_cleanup(net);
7916                 mutex_unlock(&net->nft.commit_mutex);
7917                 return;
7918         }
7919
7920         trans = list_last_entry(&net->nft.commit_list,
7921                                 struct nft_trans, list);
7922         get_net(trans->ctx.net);
7923         WARN_ON_ONCE(trans->put_net);
7924
7925         trans->put_net = true;
7926         spin_lock(&nf_tables_destroy_list_lock);
7927         list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7928         spin_unlock(&nf_tables_destroy_list_lock);
7929
7930         nf_tables_module_autoload_cleanup(net);
7931         schedule_work(&trans_destroy_work);
7932
7933         mutex_unlock(&net->nft.commit_mutex);
7934 }
7935
7936 static void nft_commit_notify(struct net *net, u32 portid)
7937 {
7938         struct sk_buff *batch_skb = NULL, *nskb, *skb;
7939         unsigned char *data;
7940         int len;
7941
7942         list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7943                 if (!batch_skb) {
7944 new_batch:
7945                         batch_skb = skb;
7946                         len = NLMSG_GOODSIZE - skb->len;
7947                         list_del(&skb->list);
7948                         continue;
7949                 }
7950                 len -= skb->len;
7951                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7952                         data = skb_put(batch_skb, skb->len);
7953                         memcpy(data, skb->data, skb->len);
7954                         list_del(&skb->list);
7955                         kfree_skb(skb);
7956                         continue;
7957                 }
7958                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7959                                NFT_CB(batch_skb).report, GFP_KERNEL);
7960                 goto new_batch;
7961         }
7962
7963         if (batch_skb) {
7964                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7965                                NFT_CB(batch_skb).report, GFP_KERNEL);
7966         }
7967
7968         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
7969 }
7970
7971 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7972 {
7973         struct nft_trans *trans, *next;
7974         struct nft_trans_elem *te;
7975         struct nft_chain *chain;
7976         struct nft_table *table;
7977         int err;
7978
7979         if (list_empty(&net->nft.commit_list)) {
7980                 mutex_unlock(&net->nft.commit_mutex);
7981                 return 0;
7982         }
7983
7984         /* 0. Validate ruleset, otherwise roll back for error reporting. */
7985         if (nf_tables_validate(net) < 0)
7986                 return -EAGAIN;
7987
7988         err = nft_flow_rule_offload_commit(net);
7989         if (err < 0)
7990                 return err;
7991
7992         /* 1.  Allocate space for next generation rules_gen_X[] */
7993         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7994                 int ret;
7995
7996                 if (trans->msg_type == NFT_MSG_NEWRULE ||
7997                     trans->msg_type == NFT_MSG_DELRULE) {
7998                         chain = trans->ctx.chain;
7999
8000                         ret = nf_tables_commit_chain_prepare(net, chain);
8001                         if (ret < 0) {
8002                                 nf_tables_commit_chain_prepare_cancel(net);
8003                                 return ret;
8004                         }
8005                 }
8006         }
8007
8008         /* step 2.  Make rules_gen_X visible to packet path */
8009         list_for_each_entry(table, &net->nft.tables, list) {
8010                 list_for_each_entry(chain, &table->chains, list)
8011                         nf_tables_commit_chain(net, chain);
8012         }
8013
8014         /*
8015          * Bump generation counter, invalidate any dump in progress.
8016          * Cannot fail after this point.
8017          */
8018         while (++net->nft.base_seq == 0);
8019
8020         /* step 3. Start new generation, rules_gen_X now in use. */
8021         net->nft.gencursor = nft_gencursor_next(net);
8022
8023         list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8024                 switch (trans->msg_type) {
8025                 case NFT_MSG_NEWTABLE:
8026                         if (nft_trans_table_update(trans)) {
8027                                 if (!nft_trans_table_enable(trans)) {
8028                                         nf_tables_table_disable(net,
8029                                                                 trans->ctx.table);
8030                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8031                                 }
8032                         } else {
8033                                 nft_clear(net, trans->ctx.table);
8034                         }
8035                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8036                         nft_trans_destroy(trans);
8037                         break;
8038                 case NFT_MSG_DELTABLE:
8039                         list_del_rcu(&trans->ctx.table->list);
8040                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8041                         break;
8042                 case NFT_MSG_NEWCHAIN:
8043                         if (nft_trans_chain_update(trans)) {
8044                                 nft_chain_commit_update(trans);
8045                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8046                                 /* trans destroyed after rcu grace period */
8047                         } else {
8048                                 nft_chain_commit_drop_policy(trans);
8049                                 nft_clear(net, trans->ctx.chain);
8050                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8051                                 nft_trans_destroy(trans);
8052                         }
8053                         break;
8054                 case NFT_MSG_DELCHAIN:
8055                         nft_chain_del(trans->ctx.chain);
8056                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8057                         nf_tables_unregister_hook(trans->ctx.net,
8058                                                   trans->ctx.table,
8059                                                   trans->ctx.chain);
8060                         break;
8061                 case NFT_MSG_NEWRULE:
8062                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8063                         nf_tables_rule_notify(&trans->ctx,
8064                                               nft_trans_rule(trans),
8065                                               NFT_MSG_NEWRULE);
8066                         nft_trans_destroy(trans);
8067                         break;
8068                 case NFT_MSG_DELRULE:
8069                         list_del_rcu(&nft_trans_rule(trans)->list);
8070                         nf_tables_rule_notify(&trans->ctx,
8071                                               nft_trans_rule(trans),
8072                                               NFT_MSG_DELRULE);
8073                         nft_rule_expr_deactivate(&trans->ctx,
8074                                                  nft_trans_rule(trans),
8075                                                  NFT_TRANS_COMMIT);
8076                         break;
8077                 case NFT_MSG_NEWSET:
8078                         nft_clear(net, nft_trans_set(trans));
8079                         /* This avoids hitting -EBUSY when deleting the table
8080                          * from the transaction.
8081                          */
8082                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8083                             !list_empty(&nft_trans_set(trans)->bindings))
8084                                 trans->ctx.table->use--;
8085
8086                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8087                                              NFT_MSG_NEWSET, GFP_KERNEL);
8088                         nft_trans_destroy(trans);
8089                         break;
8090                 case NFT_MSG_DELSET:
8091                         list_del_rcu(&nft_trans_set(trans)->list);
8092                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8093                                              NFT_MSG_DELSET, GFP_KERNEL);
8094                         break;
8095                 case NFT_MSG_NEWSETELEM:
8096                         te = (struct nft_trans_elem *)trans->data;
8097
8098                         te->set->ops->activate(net, te->set, &te->elem);
8099                         nf_tables_setelem_notify(&trans->ctx, te->set,
8100                                                  &te->elem,
8101                                                  NFT_MSG_NEWSETELEM, 0);
8102                         nft_trans_destroy(trans);
8103                         break;
8104                 case NFT_MSG_DELSETELEM:
8105                         te = (struct nft_trans_elem *)trans->data;
8106
8107                         nf_tables_setelem_notify(&trans->ctx, te->set,
8108                                                  &te->elem,
8109                                                  NFT_MSG_DELSETELEM, 0);
8110                         te->set->ops->remove(net, te->set, &te->elem);
8111                         atomic_dec(&te->set->nelems);
8112                         te->set->ndeact--;
8113                         break;
8114                 case NFT_MSG_NEWOBJ:
8115                         if (nft_trans_obj_update(trans)) {
8116                                 nft_obj_commit_update(trans);
8117                                 nf_tables_obj_notify(&trans->ctx,
8118                                                      nft_trans_obj(trans),
8119                                                      NFT_MSG_NEWOBJ);
8120                         } else {
8121                                 nft_clear(net, nft_trans_obj(trans));
8122                                 nf_tables_obj_notify(&trans->ctx,
8123                                                      nft_trans_obj(trans),
8124                                                      NFT_MSG_NEWOBJ);
8125                                 nft_trans_destroy(trans);
8126                         }
8127                         break;
8128                 case NFT_MSG_DELOBJ:
8129                         nft_obj_del(nft_trans_obj(trans));
8130                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8131                                              NFT_MSG_DELOBJ);
8132                         break;
8133                 case NFT_MSG_NEWFLOWTABLE:
8134                         if (nft_trans_flowtable_update(trans)) {
8135                                 nf_tables_flowtable_notify(&trans->ctx,
8136                                                            nft_trans_flowtable(trans),
8137                                                            &nft_trans_flowtable_hooks(trans),
8138                                                            NFT_MSG_NEWFLOWTABLE);
8139                                 list_splice(&nft_trans_flowtable_hooks(trans),
8140                                             &nft_trans_flowtable(trans)->hook_list);
8141                         } else {
8142                                 nft_clear(net, nft_trans_flowtable(trans));
8143                                 nf_tables_flowtable_notify(&trans->ctx,
8144                                                            nft_trans_flowtable(trans),
8145                                                            &nft_trans_flowtable(trans)->hook_list,
8146                                                            NFT_MSG_NEWFLOWTABLE);
8147                         }
8148                         nft_trans_destroy(trans);
8149                         break;
8150                 case NFT_MSG_DELFLOWTABLE:
8151                         if (nft_trans_flowtable_update(trans)) {
8152                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8153                                                         &nft_trans_flowtable_hooks(trans));
8154                                 nf_tables_flowtable_notify(&trans->ctx,
8155                                                            nft_trans_flowtable(trans),
8156                                                            &nft_trans_flowtable_hooks(trans),
8157                                                            NFT_MSG_DELFLOWTABLE);
8158                                 nft_unregister_flowtable_net_hooks(net,
8159                                                                    &nft_trans_flowtable_hooks(trans));
8160                         } else {
8161                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8162                                 nf_tables_flowtable_notify(&trans->ctx,
8163                                                            nft_trans_flowtable(trans),
8164                                                            &nft_trans_flowtable(trans)->hook_list,
8165                                                            NFT_MSG_DELFLOWTABLE);
8166                                 nft_unregister_flowtable_net_hooks(net,
8167                                                 &nft_trans_flowtable(trans)->hook_list);
8168                         }
8169                         break;
8170                 }
8171         }
8172
8173         nft_commit_notify(net, NETLINK_CB(skb).portid);
8174         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8175         nf_tables_commit_release(net);
8176
8177         return 0;
8178 }
8179
8180 static void nf_tables_module_autoload(struct net *net)
8181 {
8182         struct nft_module_request *req, *next;
8183         LIST_HEAD(module_list);
8184
8185         list_splice_init(&net->nft.module_list, &module_list);
8186         mutex_unlock(&net->nft.commit_mutex);
8187         list_for_each_entry_safe(req, next, &module_list, list) {
8188                 request_module("%s", req->module);
8189                 req->done = true;
8190         }
8191         mutex_lock(&net->nft.commit_mutex);
8192         list_splice(&module_list, &net->nft.module_list);
8193 }
8194
8195 static void nf_tables_abort_release(struct nft_trans *trans)
8196 {
8197         switch (trans->msg_type) {
8198         case NFT_MSG_NEWTABLE:
8199                 nf_tables_table_destroy(&trans->ctx);
8200                 break;
8201         case NFT_MSG_NEWCHAIN:
8202                 nf_tables_chain_destroy(&trans->ctx);
8203                 break;
8204         case NFT_MSG_NEWRULE:
8205                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8206                 break;
8207         case NFT_MSG_NEWSET:
8208                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8209                 break;
8210         case NFT_MSG_NEWSETELEM:
8211                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8212                                      nft_trans_elem(trans).priv, true);
8213                 break;
8214         case NFT_MSG_NEWOBJ:
8215                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8216                 break;
8217         case NFT_MSG_NEWFLOWTABLE:
8218                 if (nft_trans_flowtable_update(trans))
8219                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8220                 else
8221                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8222                 break;
8223         }
8224         kfree(trans);
8225 }
8226
8227 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8228 {
8229         struct nft_trans *trans, *next;
8230         struct nft_trans_elem *te;
8231         struct nft_hook *hook;
8232
8233         if (action == NFNL_ABORT_VALIDATE &&
8234             nf_tables_validate(net) < 0)
8235                 return -EAGAIN;
8236
8237         list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8238                                          list) {
8239                 switch (trans->msg_type) {
8240                 case NFT_MSG_NEWTABLE:
8241                         if (nft_trans_table_update(trans)) {
8242                                 if (nft_trans_table_enable(trans)) {
8243                                         nf_tables_table_disable(net,
8244                                                                 trans->ctx.table);
8245                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8246                                 }
8247                                 nft_trans_destroy(trans);
8248                         } else {
8249                                 list_del_rcu(&trans->ctx.table->list);
8250                         }
8251                         break;
8252                 case NFT_MSG_DELTABLE:
8253                         nft_clear(trans->ctx.net, trans->ctx.table);
8254                         nft_trans_destroy(trans);
8255                         break;
8256                 case NFT_MSG_NEWCHAIN:
8257                         if (nft_trans_chain_update(trans)) {
8258                                 free_percpu(nft_trans_chain_stats(trans));
8259                                 kfree(nft_trans_chain_name(trans));
8260                                 nft_trans_destroy(trans);
8261                         } else {
8262                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8263                                         nft_trans_destroy(trans);
8264                                         break;
8265                                 }
8266                                 trans->ctx.table->use--;
8267                                 nft_chain_del(trans->ctx.chain);
8268                                 nf_tables_unregister_hook(trans->ctx.net,
8269                                                           trans->ctx.table,
8270                                                           trans->ctx.chain);
8271                         }
8272                         break;
8273                 case NFT_MSG_DELCHAIN:
8274                         trans->ctx.table->use++;
8275                         nft_clear(trans->ctx.net, trans->ctx.chain);
8276                         nft_trans_destroy(trans);
8277                         break;
8278                 case NFT_MSG_NEWRULE:
8279                         trans->ctx.chain->use--;
8280                         list_del_rcu(&nft_trans_rule(trans)->list);
8281                         nft_rule_expr_deactivate(&trans->ctx,
8282                                                  nft_trans_rule(trans),
8283                                                  NFT_TRANS_ABORT);
8284                         break;
8285                 case NFT_MSG_DELRULE:
8286                         trans->ctx.chain->use++;
8287                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8288                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8289                         nft_trans_destroy(trans);
8290                         break;
8291                 case NFT_MSG_NEWSET:
8292                         trans->ctx.table->use--;
8293                         if (nft_trans_set_bound(trans)) {
8294                                 nft_trans_destroy(trans);
8295                                 break;
8296                         }
8297                         list_del_rcu(&nft_trans_set(trans)->list);
8298                         break;
8299                 case NFT_MSG_DELSET:
8300                         trans->ctx.table->use++;
8301                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8302                         nft_trans_destroy(trans);
8303                         break;
8304                 case NFT_MSG_NEWSETELEM:
8305                         if (nft_trans_elem_set_bound(trans)) {
8306                                 nft_trans_destroy(trans);
8307                                 break;
8308                         }
8309                         te = (struct nft_trans_elem *)trans->data;
8310                         te->set->ops->remove(net, te->set, &te->elem);
8311                         atomic_dec(&te->set->nelems);
8312                         break;
8313                 case NFT_MSG_DELSETELEM:
8314                         te = (struct nft_trans_elem *)trans->data;
8315
8316                         nft_set_elem_activate(net, te->set, &te->elem);
8317                         te->set->ops->activate(net, te->set, &te->elem);
8318                         te->set->ndeact--;
8319
8320                         nft_trans_destroy(trans);
8321                         break;
8322                 case NFT_MSG_NEWOBJ:
8323                         if (nft_trans_obj_update(trans)) {
8324                                 kfree(nft_trans_obj_newobj(trans));
8325                                 nft_trans_destroy(trans);
8326                         } else {
8327                                 trans->ctx.table->use--;
8328                                 nft_obj_del(nft_trans_obj(trans));
8329                         }
8330                         break;
8331                 case NFT_MSG_DELOBJ:
8332                         trans->ctx.table->use++;
8333                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8334                         nft_trans_destroy(trans);
8335                         break;
8336                 case NFT_MSG_NEWFLOWTABLE:
8337                         if (nft_trans_flowtable_update(trans)) {
8338                                 nft_unregister_flowtable_net_hooks(net,
8339                                                 &nft_trans_flowtable_hooks(trans));
8340                         } else {
8341                                 trans->ctx.table->use--;
8342                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8343                                 nft_unregister_flowtable_net_hooks(net,
8344                                                 &nft_trans_flowtable(trans)->hook_list);
8345                         }
8346                         break;
8347                 case NFT_MSG_DELFLOWTABLE:
8348                         if (nft_trans_flowtable_update(trans)) {
8349                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8350                                         hook->inactive = false;
8351                         } else {
8352                                 trans->ctx.table->use++;
8353                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8354                         }
8355                         nft_trans_destroy(trans);
8356                         break;
8357                 }
8358         }
8359
8360         synchronize_rcu();
8361
8362         list_for_each_entry_safe_reverse(trans, next,
8363                                          &net->nft.commit_list, list) {
8364                 list_del(&trans->list);
8365                 nf_tables_abort_release(trans);
8366         }
8367
8368         if (action == NFNL_ABORT_AUTOLOAD)
8369                 nf_tables_module_autoload(net);
8370         else
8371                 nf_tables_module_autoload_cleanup(net);
8372
8373         return 0;
8374 }
8375
8376 static void nf_tables_cleanup(struct net *net)
8377 {
8378         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8379 }
8380
8381 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8382                            enum nfnl_abort_action action)
8383 {
8384         int ret = __nf_tables_abort(net, action);
8385
8386         mutex_unlock(&net->nft.commit_mutex);
8387
8388         return ret;
8389 }
8390
8391 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8392 {
8393         bool genid_ok;
8394
8395         mutex_lock(&net->nft.commit_mutex);
8396
8397         genid_ok = genid == 0 || net->nft.base_seq == genid;
8398         if (!genid_ok)
8399                 mutex_unlock(&net->nft.commit_mutex);
8400
8401         /* else, commit mutex has to be released by commit or abort function */
8402         return genid_ok;
8403 }
8404
8405 static const struct nfnetlink_subsystem nf_tables_subsys = {
8406         .name           = "nf_tables",
8407         .subsys_id      = NFNL_SUBSYS_NFTABLES,
8408         .cb_count       = NFT_MSG_MAX,
8409         .cb             = nf_tables_cb,
8410         .commit         = nf_tables_commit,
8411         .abort          = nf_tables_abort,
8412         .cleanup        = nf_tables_cleanup,
8413         .valid_genid    = nf_tables_valid_genid,
8414         .owner          = THIS_MODULE,
8415 };
8416
8417 int nft_chain_validate_dependency(const struct nft_chain *chain,
8418                                   enum nft_chain_types type)
8419 {
8420         const struct nft_base_chain *basechain;
8421
8422         if (nft_is_base_chain(chain)) {
8423                 basechain = nft_base_chain(chain);
8424                 if (basechain->type->type != type)
8425                         return -EOPNOTSUPP;
8426         }
8427         return 0;
8428 }
8429 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8430
8431 int nft_chain_validate_hooks(const struct nft_chain *chain,
8432                              unsigned int hook_flags)
8433 {
8434         struct nft_base_chain *basechain;
8435
8436         if (nft_is_base_chain(chain)) {
8437                 basechain = nft_base_chain(chain);
8438
8439                 if ((1 << basechain->ops.hooknum) & hook_flags)
8440                         return 0;
8441
8442                 return -EOPNOTSUPP;
8443         }
8444
8445         return 0;
8446 }
8447 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8448
8449 /*
8450  * Loop detection - walk through the ruleset beginning at the destination chain
8451  * of a new jump until either the source chain is reached (loop) or all
8452  * reachable chains have been traversed.
8453  *
8454  * The loop check is performed whenever a new jump verdict is added to an
8455  * expression or verdict map or a verdict map is bound to a new chain.
8456  */
8457
8458 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8459                                  const struct nft_chain *chain);
8460
8461 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8462                                         struct nft_set *set,
8463                                         const struct nft_set_iter *iter,
8464                                         struct nft_set_elem *elem)
8465 {
8466         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8467         const struct nft_data *data;
8468
8469         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8470             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8471                 return 0;
8472
8473         data = nft_set_ext_data(ext);
8474         switch (data->verdict.code) {
8475         case NFT_JUMP:
8476         case NFT_GOTO:
8477                 return nf_tables_check_loops(ctx, data->verdict.chain);
8478         default:
8479                 return 0;
8480         }
8481 }
8482
8483 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8484                                  const struct nft_chain *chain)
8485 {
8486         const struct nft_rule *rule;
8487         const struct nft_expr *expr, *last;
8488         struct nft_set *set;
8489         struct nft_set_binding *binding;
8490         struct nft_set_iter iter;
8491
8492         if (ctx->chain == chain)
8493                 return -ELOOP;
8494
8495         list_for_each_entry(rule, &chain->rules, list) {
8496                 nft_rule_for_each_expr(expr, last, rule) {
8497                         struct nft_immediate_expr *priv;
8498                         const struct nft_data *data;
8499                         int err;
8500
8501                         if (strcmp(expr->ops->type->name, "immediate"))
8502                                 continue;
8503
8504                         priv = nft_expr_priv(expr);
8505                         if (priv->dreg != NFT_REG_VERDICT)
8506                                 continue;
8507
8508                         data = &priv->data;
8509                         switch (data->verdict.code) {
8510                         case NFT_JUMP:
8511                         case NFT_GOTO:
8512                                 err = nf_tables_check_loops(ctx,
8513                                                         data->verdict.chain);
8514                                 if (err < 0)
8515                                         return err;
8516                         default:
8517                                 break;
8518                         }
8519                 }
8520         }
8521
8522         list_for_each_entry(set, &ctx->table->sets, list) {
8523                 if (!nft_is_active_next(ctx->net, set))
8524                         continue;
8525                 if (!(set->flags & NFT_SET_MAP) ||
8526                     set->dtype != NFT_DATA_VERDICT)
8527                         continue;
8528
8529                 list_for_each_entry(binding, &set->bindings, list) {
8530                         if (!(binding->flags & NFT_SET_MAP) ||
8531                             binding->chain != chain)
8532                                 continue;
8533
8534                         iter.genmask    = nft_genmask_next(ctx->net);
8535                         iter.skip       = 0;
8536                         iter.count      = 0;
8537                         iter.err        = 0;
8538                         iter.fn         = nf_tables_loop_check_setelem;
8539
8540                         set->ops->walk(ctx, set, &iter);
8541                         if (iter.err < 0)
8542                                 return iter.err;
8543                 }
8544         }
8545
8546         return 0;
8547 }
8548
8549 /**
8550  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
8551  *
8552  *      @attr: netlink attribute to fetch value from
8553  *      @max: maximum value to be stored in dest
8554  *      @dest: pointer to the variable
8555  *
8556  *      Parse, check and store a given u32 netlink attribute into variable.
8557  *      This function returns -ERANGE if the value goes over maximum value.
8558  *      Otherwise a 0 is returned and the attribute value is stored in the
8559  *      destination variable.
8560  */
8561 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8562 {
8563         u32 val;
8564
8565         val = ntohl(nla_get_be32(attr));
8566         if (val > max)
8567                 return -ERANGE;
8568
8569         *dest = val;
8570         return 0;
8571 }
8572 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8573
8574 /**
8575  *      nft_parse_register - parse a register value from a netlink attribute
8576  *
8577  *      @attr: netlink attribute
8578  *
8579  *      Parse and translate a register value from a netlink attribute.
8580  *      Registers used to be 128 bit wide, these register numbers will be
8581  *      mapped to the corresponding 32 bit register numbers.
8582  */
8583 unsigned int nft_parse_register(const struct nlattr *attr)
8584 {
8585         unsigned int reg;
8586
8587         reg = ntohl(nla_get_be32(attr));
8588         switch (reg) {
8589         case NFT_REG_VERDICT...NFT_REG_4:
8590                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8591         default:
8592                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8593         }
8594 }
8595 EXPORT_SYMBOL_GPL(nft_parse_register);
8596
8597 /**
8598  *      nft_dump_register - dump a register value to a netlink attribute
8599  *
8600  *      @skb: socket buffer
8601  *      @attr: attribute number
8602  *      @reg: register number
8603  *
8604  *      Construct a netlink attribute containing the register number. For
8605  *      compatibility reasons, register numbers being a multiple of 4 are
8606  *      translated to the corresponding 128 bit register numbers.
8607  */
8608 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8609 {
8610         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8611                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8612         else
8613                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8614
8615         return nla_put_be32(skb, attr, htonl(reg));
8616 }
8617 EXPORT_SYMBOL_GPL(nft_dump_register);
8618
8619 /**
8620  *      nft_validate_register_load - validate a load from a register
8621  *
8622  *      @reg: the register number
8623  *      @len: the length of the data
8624  *
8625  *      Validate that the input register is one of the general purpose
8626  *      registers and that the length of the load is within the bounds.
8627  */
8628 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8629 {
8630         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8631                 return -EINVAL;
8632         if (len == 0)
8633                 return -EINVAL;
8634         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8635                 return -ERANGE;
8636
8637         return 0;
8638 }
8639 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8640
8641 /**
8642  *      nft_validate_register_store - validate an expressions' register store
8643  *
8644  *      @ctx: context of the expression performing the load
8645  *      @reg: the destination register number
8646  *      @data: the data to load
8647  *      @type: the data type
8648  *      @len: the length of the data
8649  *
8650  *      Validate that a data load uses the appropriate data type for
8651  *      the destination register and the length is within the bounds.
8652  *      A value of NULL for the data means that its runtime gathered
8653  *      data.
8654  */
8655 int nft_validate_register_store(const struct nft_ctx *ctx,
8656                                 enum nft_registers reg,
8657                                 const struct nft_data *data,
8658                                 enum nft_data_types type, unsigned int len)
8659 {
8660         int err;
8661
8662         switch (reg) {
8663         case NFT_REG_VERDICT:
8664                 if (type != NFT_DATA_VERDICT)
8665                         return -EINVAL;
8666
8667                 if (data != NULL &&
8668                     (data->verdict.code == NFT_GOTO ||
8669                      data->verdict.code == NFT_JUMP)) {
8670                         err = nf_tables_check_loops(ctx, data->verdict.chain);
8671                         if (err < 0)
8672                                 return err;
8673                 }
8674
8675                 return 0;
8676         default:
8677                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8678                         return -EINVAL;
8679                 if (len == 0)
8680                         return -EINVAL;
8681                 if (reg * NFT_REG32_SIZE + len >
8682                     sizeof_field(struct nft_regs, data))
8683                         return -ERANGE;
8684
8685                 if (data != NULL && type != NFT_DATA_VALUE)
8686                         return -EINVAL;
8687                 return 0;
8688         }
8689 }
8690 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8691
8692 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8693         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
8694         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
8695                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
8696         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8697 };
8698
8699 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8700                             struct nft_data_desc *desc, const struct nlattr *nla)
8701 {
8702         u8 genmask = nft_genmask_next(ctx->net);
8703         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8704         struct nft_chain *chain;
8705         int err;
8706
8707         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8708                                           nft_verdict_policy, NULL);
8709         if (err < 0)
8710                 return err;
8711
8712         if (!tb[NFTA_VERDICT_CODE])
8713                 return -EINVAL;
8714         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8715
8716         switch (data->verdict.code) {
8717         default:
8718                 switch (data->verdict.code & NF_VERDICT_MASK) {
8719                 case NF_ACCEPT:
8720                 case NF_DROP:
8721                 case NF_QUEUE:
8722                         break;
8723                 default:
8724                         return -EINVAL;
8725                 }
8726                 fallthrough;
8727         case NFT_CONTINUE:
8728         case NFT_BREAK:
8729         case NFT_RETURN:
8730                 break;
8731         case NFT_JUMP:
8732         case NFT_GOTO:
8733                 if (tb[NFTA_VERDICT_CHAIN]) {
8734                         chain = nft_chain_lookup(ctx->net, ctx->table,
8735                                                  tb[NFTA_VERDICT_CHAIN],
8736                                                  genmask);
8737                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8738                         chain = nft_chain_lookup_byid(ctx->net,
8739                                                       tb[NFTA_VERDICT_CHAIN_ID]);
8740                         if (IS_ERR(chain))
8741                                 return PTR_ERR(chain);
8742                 } else {
8743                         return -EINVAL;
8744                 }
8745
8746                 if (IS_ERR(chain))
8747                         return PTR_ERR(chain);
8748                 if (nft_is_base_chain(chain))
8749                         return -EOPNOTSUPP;
8750
8751                 chain->use++;
8752                 data->verdict.chain = chain;
8753                 break;
8754         }
8755
8756         desc->len = sizeof(data->verdict);
8757         desc->type = NFT_DATA_VERDICT;
8758         return 0;
8759 }
8760
8761 static void nft_verdict_uninit(const struct nft_data *data)
8762 {
8763         struct nft_chain *chain;
8764         struct nft_rule *rule;
8765
8766         switch (data->verdict.code) {
8767         case NFT_JUMP:
8768         case NFT_GOTO:
8769                 chain = data->verdict.chain;
8770                 chain->use--;
8771
8772                 if (!nft_chain_is_bound(chain))
8773                         break;
8774
8775                 chain->table->use--;
8776                 list_for_each_entry(rule, &chain->rules, list)
8777                         chain->use--;
8778
8779                 nft_chain_del(chain);
8780                 break;
8781         }
8782 }
8783
8784 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8785 {
8786         struct nlattr *nest;
8787
8788         nest = nla_nest_start_noflag(skb, type);
8789         if (!nest)
8790                 goto nla_put_failure;
8791
8792         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8793                 goto nla_put_failure;
8794
8795         switch (v->code) {
8796         case NFT_JUMP:
8797         case NFT_GOTO:
8798                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8799                                    v->chain->name))
8800                         goto nla_put_failure;
8801         }
8802         nla_nest_end(skb, nest);
8803         return 0;
8804
8805 nla_put_failure:
8806         return -1;
8807 }
8808
8809 static int nft_value_init(const struct nft_ctx *ctx,
8810                           struct nft_data *data, unsigned int size,
8811                           struct nft_data_desc *desc, const struct nlattr *nla)
8812 {
8813         unsigned int len;
8814
8815         len = nla_len(nla);
8816         if (len == 0)
8817                 return -EINVAL;
8818         if (len > size)
8819                 return -EOVERFLOW;
8820
8821         nla_memcpy(data->data, nla, len);
8822         desc->type = NFT_DATA_VALUE;
8823         desc->len  = len;
8824         return 0;
8825 }
8826
8827 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8828                           unsigned int len)
8829 {
8830         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8831 }
8832
8833 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8834         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
8835         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
8836 };
8837
8838 /**
8839  *      nft_data_init - parse nf_tables data netlink attributes
8840  *
8841  *      @ctx: context of the expression using the data
8842  *      @data: destination struct nft_data
8843  *      @size: maximum data length
8844  *      @desc: data description
8845  *      @nla: netlink attribute containing data
8846  *
8847  *      Parse the netlink data attributes and initialize a struct nft_data.
8848  *      The type and length of data are returned in the data description.
8849  *
8850  *      The caller can indicate that it only wants to accept data of type
8851  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
8852  */
8853 int nft_data_init(const struct nft_ctx *ctx,
8854                   struct nft_data *data, unsigned int size,
8855                   struct nft_data_desc *desc, const struct nlattr *nla)
8856 {
8857         struct nlattr *tb[NFTA_DATA_MAX + 1];
8858         int err;
8859
8860         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8861                                           nft_data_policy, NULL);
8862         if (err < 0)
8863                 return err;
8864
8865         if (tb[NFTA_DATA_VALUE])
8866                 return nft_value_init(ctx, data, size, desc,
8867                                       tb[NFTA_DATA_VALUE]);
8868         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8869                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8870         return -EINVAL;
8871 }
8872 EXPORT_SYMBOL_GPL(nft_data_init);
8873
8874 /**
8875  *      nft_data_release - release a nft_data item
8876  *
8877  *      @data: struct nft_data to release
8878  *      @type: type of data
8879  *
8880  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8881  *      all others need to be released by calling this function.
8882  */
8883 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8884 {
8885         if (type < NFT_DATA_VERDICT)
8886                 return;
8887         switch (type) {
8888         case NFT_DATA_VERDICT:
8889                 return nft_verdict_uninit(data);
8890         default:
8891                 WARN_ON(1);
8892         }
8893 }
8894 EXPORT_SYMBOL_GPL(nft_data_release);
8895
8896 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8897                   enum nft_data_types type, unsigned int len)
8898 {
8899         struct nlattr *nest;
8900         int err;
8901
8902         nest = nla_nest_start_noflag(skb, attr);
8903         if (nest == NULL)
8904                 return -1;
8905
8906         switch (type) {
8907         case NFT_DATA_VALUE:
8908                 err = nft_value_dump(skb, data, len);
8909                 break;
8910         case NFT_DATA_VERDICT:
8911                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8912                 break;
8913         default:
8914                 err = -EINVAL;
8915                 WARN_ON(1);
8916         }
8917
8918         nla_nest_end(skb, nest);
8919         return err;
8920 }
8921 EXPORT_SYMBOL_GPL(nft_data_dump);
8922
8923 int __nft_release_basechain(struct nft_ctx *ctx)
8924 {
8925         struct nft_rule *rule, *nr;
8926
8927         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8928                 return 0;
8929
8930         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8931         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8932                 list_del(&rule->list);
8933                 ctx->chain->use--;
8934                 nf_tables_rule_release(ctx, rule);
8935         }
8936         nft_chain_del(ctx->chain);
8937         ctx->table->use--;
8938         nf_tables_chain_destroy(ctx);
8939
8940         return 0;
8941 }
8942 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8943
8944 static void __nft_release_tables(struct net *net)
8945 {
8946         struct nft_flowtable *flowtable, *nf;
8947         struct nft_table *table, *nt;
8948         struct nft_chain *chain, *nc;
8949         struct nft_object *obj, *ne;
8950         struct nft_rule *rule, *nr;
8951         struct nft_set *set, *ns;
8952         struct nft_ctx ctx = {
8953                 .net    = net,
8954                 .family = NFPROTO_NETDEV,
8955         };
8956
8957         list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8958                 ctx.family = table->family;
8959
8960                 list_for_each_entry(chain, &table->chains, list)
8961                         nf_tables_unregister_hook(net, table, chain);
8962                 /* No packets are walking on these chains anymore. */
8963                 ctx.table = table;
8964                 list_for_each_entry(chain, &table->chains, list) {
8965                         ctx.chain = chain;
8966                         list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8967                                 list_del(&rule->list);
8968                                 chain->use--;
8969                                 nf_tables_rule_release(&ctx, rule);
8970                         }
8971                 }
8972                 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8973                         list_del(&flowtable->list);
8974                         table->use--;
8975                         nf_tables_flowtable_destroy(flowtable);
8976                 }
8977                 list_for_each_entry_safe(set, ns, &table->sets, list) {
8978                         list_del(&set->list);
8979                         table->use--;
8980                         nft_set_destroy(&ctx, set);
8981                 }
8982                 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8983                         nft_obj_del(obj);
8984                         table->use--;
8985                         nft_obj_destroy(&ctx, obj);
8986                 }
8987                 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8988                         ctx.chain = chain;
8989                         nft_chain_del(chain);
8990                         table->use--;
8991                         nf_tables_chain_destroy(&ctx);
8992                 }
8993                 list_del(&table->list);
8994                 nf_tables_table_destroy(&ctx);
8995         }
8996 }
8997
8998 static int __net_init nf_tables_init_net(struct net *net)
8999 {
9000         INIT_LIST_HEAD(&net->nft.tables);
9001         INIT_LIST_HEAD(&net->nft.commit_list);
9002         INIT_LIST_HEAD(&net->nft.module_list);
9003         INIT_LIST_HEAD(&net->nft.notify_list);
9004         mutex_init(&net->nft.commit_mutex);
9005         net->nft.base_seq = 1;
9006         net->nft.validate_state = NFT_VALIDATE_SKIP;
9007
9008         return 0;
9009 }
9010
9011 static void __net_exit nf_tables_exit_net(struct net *net)
9012 {
9013         mutex_lock(&net->nft.commit_mutex);
9014         if (!list_empty(&net->nft.commit_list))
9015                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9016         __nft_release_tables(net);
9017         mutex_unlock(&net->nft.commit_mutex);
9018         WARN_ON_ONCE(!list_empty(&net->nft.tables));
9019         WARN_ON_ONCE(!list_empty(&net->nft.module_list));
9020         WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
9021 }
9022
9023 static struct pernet_operations nf_tables_net_ops = {
9024         .init   = nf_tables_init_net,
9025         .exit   = nf_tables_exit_net,
9026 };
9027
9028 static int __init nf_tables_module_init(void)
9029 {
9030         int err;
9031
9032         spin_lock_init(&nf_tables_destroy_list_lock);
9033         err = register_pernet_subsys(&nf_tables_net_ops);
9034         if (err < 0)
9035                 return err;
9036
9037         err = nft_chain_filter_init();
9038         if (err < 0)
9039                 goto err1;
9040
9041         err = nf_tables_core_module_init();
9042         if (err < 0)
9043                 goto err2;
9044
9045         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9046         if (err < 0)
9047                 goto err3;
9048
9049         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9050         if (err < 0)
9051                 goto err4;
9052
9053         err = nft_offload_init();
9054         if (err < 0)
9055                 goto err5;
9056
9057         /* must be last */
9058         err = nfnetlink_subsys_register(&nf_tables_subsys);
9059         if (err < 0)
9060                 goto err6;
9061
9062         nft_chain_route_init();
9063
9064         return err;
9065 err6:
9066         nft_offload_exit();
9067 err5:
9068         rhltable_destroy(&nft_objname_ht);
9069 err4:
9070         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9071 err3:
9072         nf_tables_core_module_exit();
9073 err2:
9074         nft_chain_filter_fini();
9075 err1:
9076         unregister_pernet_subsys(&nf_tables_net_ops);
9077         return err;
9078 }
9079
9080 static void __exit nf_tables_module_exit(void)
9081 {
9082         nfnetlink_subsys_unregister(&nf_tables_subsys);
9083         nft_offload_exit();
9084         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9085         nft_chain_filter_fini();
9086         nft_chain_route_fini();
9087         unregister_pernet_subsys(&nf_tables_net_ops);
9088         cancel_work_sync(&trans_destroy_work);
9089         rcu_barrier();
9090         rhltable_destroy(&nft_objname_ht);
9091         nf_tables_core_module_exit();
9092 }
9093
9094 module_init(nf_tables_module_init);
9095 module_exit(nf_tables_module_exit);
9096
9097 MODULE_LICENSE("GPL");
9098 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9099 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);