net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35 static u64 table_handle;
  36
  37 enum {
  38         NFT_VALIDATE_SKIP       = 0,
  39         NFT_VALIDATE_NEED,
  40         NFT_VALIDATE_DO,
  41 };
  42
  43 static struct rhltable nft_objname_ht;
  44
  45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  48
  49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  52
  53 static const struct rhashtable_params nft_chain_ht_params = {
  54         .head_offset            = offsetof(struct nft_chain, rhlhead),
  55         .key_offset             = offsetof(struct nft_chain, name),
  56         .hashfn                 = nft_chain_hash,
  57         .obj_hashfn             = nft_chain_hash_obj,
  58         .obj_cmpfn              = nft_chain_hash_cmp,
  59         .automatic_shrinking    = true,
  60 };
  61
  62 static const struct rhashtable_params nft_objname_ht_params = {
  63         .head_offset            = offsetof(struct nft_object, rhlhead),
  64         .key_offset             = offsetof(struct nft_object, key),
  65         .hashfn                 = nft_objname_hash,
  66         .obj_hashfn             = nft_objname_hash_obj,
  67         .obj_cmpfn              = nft_objname_hash_cmp,
  68         .automatic_shrinking    = true,
  69 };
  70
  71 struct nft_audit_data {
  72         struct nft_table *table;
  73         int entries;
  74         int op;
  75         struct list_head list;
  76 };
  77
  78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  79         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  80         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  81         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  82         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  83         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  84         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  85         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  86         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  87         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  88         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  89         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  90         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  91         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  92         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  93         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  94         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  95         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  98         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 100         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 101         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 102         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 103         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 104 };
 105
 106 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 107 {
 108         struct nftables_pernet *nft_net = nft_pernet(net);
 109
 110         switch (nft_net->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         nft_net->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_ctx_init(struct nft_ctx *ctx,
 127                          struct net *net,
 128                          const struct sk_buff *skb,
 129                          const struct nlmsghdr *nlh,
 130                          u8 family,
 131                          struct nft_table *table,
 132                          struct nft_chain *chain,
 133                          const struct nlattr * const *nla)
 134 {
 135         ctx->net        = net;
 136         ctx->family     = family;
 137         ctx->level      = 0;
 138         ctx->table      = table;
 139         ctx->chain      = chain;
 140         ctx->nla        = nla;
 141         ctx->portid     = NETLINK_CB(skb).portid;
 142         ctx->report     = nlmsg_report(nlh);
 143         ctx->flags      = nlh->nlmsg_flags;
 144         ctx->seq        = nlh->nlmsg_seq;
 145 }
 146
 147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 148                                              int msg_type, u32 size, gfp_t gfp)
 149 {
 150         struct nft_trans *trans;
 151
 152         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 153         if (trans == NULL)
 154                 return NULL;
 155
 156         trans->msg_type = msg_type;
 157         trans->ctx      = *ctx;
 158
 159         return trans;
 160 }
 161
 162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 163                                          int msg_type, u32 size)
 164 {
 165         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 166 }
 167
 168 static void nft_trans_destroy(struct nft_trans *trans)
 169 {
 170         list_del(&trans->list);
 171         kfree(trans);
 172 }
 173
 174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 175 {
 176         struct nftables_pernet *nft_net;
 177         struct net *net = ctx->net;
 178         struct nft_trans *trans;
 179
 180         if (!nft_set_is_anonymous(set))
 181                 return;
 182
 183         nft_net = nft_pernet(net);
 184         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 185                 switch (trans->msg_type) {
 186                 case NFT_MSG_NEWSET:
 187                         if (nft_trans_set(trans) == set)
 188                                 nft_trans_set_bound(trans) = true;
 189                         break;
 190                 case NFT_MSG_NEWSETELEM:
 191                         if (nft_trans_elem_set(trans) == set)
 192                                 nft_trans_elem_set_bound(trans) = true;
 193                         break;
 194                 }
 195         }
 196 }
 197
 198 static int nft_netdev_register_hooks(struct net *net,
 199                                      struct list_head *hook_list)
 200 {
 201         struct nft_hook *hook;
 202         int err, j;
 203
 204         j = 0;
 205         list_for_each_entry(hook, hook_list, list) {
 206                 err = nf_register_net_hook(net, &hook->ops);
 207                 if (err < 0)
 208                         goto err_register;
 209
 210                 j++;
 211         }
 212         return 0;
 213
 214 err_register:
 215         list_for_each_entry(hook, hook_list, list) {
 216                 if (j-- <= 0)
 217                         break;
 218
 219                 nf_unregister_net_hook(net, &hook->ops);
 220         }
 221         return err;
 222 }
 223
 224 static void nft_netdev_unregister_hooks(struct net *net,
 225                                         struct list_head *hook_list)
 226 {
 227         struct nft_hook *hook;
 228
 229         list_for_each_entry(hook, hook_list, list)
 230                 nf_unregister_net_hook(net, &hook->ops);
 231 }
 232
 233 static int nf_tables_register_hook(struct net *net,
 234                                    const struct nft_table *table,
 235                                    struct nft_chain *chain)
 236 {
 237         struct nft_base_chain *basechain;
 238         const struct nf_hook_ops *ops;
 239
 240         if (table->flags & NFT_TABLE_F_DORMANT ||
 241             !nft_is_base_chain(chain))
 242                 return 0;
 243
 244         basechain = nft_base_chain(chain);
 245         ops = &basechain->ops;
 246
 247         if (basechain->type->ops_register)
 248                 return basechain->type->ops_register(net, ops);
 249
 250         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 251                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 252
 253         return nf_register_net_hook(net, &basechain->ops);
 254 }
 255
 256 static void nf_tables_unregister_hook(struct net *net,
 257                                       const struct nft_table *table,
 258                                       struct nft_chain *chain)
 259 {
 260         struct nft_base_chain *basechain;
 261         const struct nf_hook_ops *ops;
 262
 263         if (table->flags & NFT_TABLE_F_DORMANT ||
 264             !nft_is_base_chain(chain))
 265                 return;
 266         basechain = nft_base_chain(chain);
 267         ops = &basechain->ops;
 268
 269         if (basechain->type->ops_unregister)
 270                 return basechain->type->ops_unregister(net, ops);
 271
 272         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 273                 nft_netdev_unregister_hooks(net, &basechain->hook_list);
 274         else
 275                 nf_unregister_net_hook(net, &basechain->ops);
 276 }
 277
 278 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 279 {
 280         struct nftables_pernet *nft_net = nft_pernet(net);
 281
 282         list_add_tail(&trans->list, &nft_net->commit_list);
 283 }
 284
 285 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 286 {
 287         struct nft_trans *trans;
 288
 289         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 290         if (trans == NULL)
 291                 return -ENOMEM;
 292
 293         if (msg_type == NFT_MSG_NEWTABLE)
 294                 nft_activate_next(ctx->net, ctx->table);
 295
 296         nft_trans_commit_list_add_tail(ctx->net, trans);
 297         return 0;
 298 }
 299
 300 static int nft_deltable(struct nft_ctx *ctx)
 301 {
 302         int err;
 303
 304         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 305         if (err < 0)
 306                 return err;
 307
 308         nft_deactivate_next(ctx->net, ctx->table);
 309         return err;
 310 }
 311
 312 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 313 {
 314         struct nft_trans *trans;
 315
 316         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 317         if (trans == NULL)
 318                 return ERR_PTR(-ENOMEM);
 319
 320         if (msg_type == NFT_MSG_NEWCHAIN) {
 321                 nft_activate_next(ctx->net, ctx->chain);
 322
 323                 if (ctx->nla[NFTA_CHAIN_ID]) {
 324                         nft_trans_chain_id(trans) =
 325                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 326                 }
 327         }
 328
 329         nft_trans_commit_list_add_tail(ctx->net, trans);
 330         return trans;
 331 }
 332
 333 static int nft_delchain(struct nft_ctx *ctx)
 334 {
 335         struct nft_trans *trans;
 336
 337         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 338         if (IS_ERR(trans))
 339                 return PTR_ERR(trans);
 340
 341         ctx->table->use--;
 342         nft_deactivate_next(ctx->net, ctx->chain);
 343
 344         return 0;
 345 }
 346
 347 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 348                                    struct nft_rule *rule)
 349 {
 350         struct nft_expr *expr;
 351
 352         expr = nft_expr_first(rule);
 353         while (nft_expr_more(rule, expr)) {
 354                 if (expr->ops->activate)
 355                         expr->ops->activate(ctx, expr);
 356
 357                 expr = nft_expr_next(expr);
 358         }
 359 }
 360
 361 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 362                                      struct nft_rule *rule,
 363                                      enum nft_trans_phase phase)
 364 {
 365         struct nft_expr *expr;
 366
 367         expr = nft_expr_first(rule);
 368         while (nft_expr_more(rule, expr)) {
 369                 if (expr->ops->deactivate)
 370                         expr->ops->deactivate(ctx, expr, phase);
 371
 372                 expr = nft_expr_next(expr);
 373         }
 374 }
 375
 376 static int
 377 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 378 {
 379         /* You cannot delete the same rule twice */
 380         if (nft_is_active_next(ctx->net, rule)) {
 381                 nft_deactivate_next(ctx->net, rule);
 382                 ctx->chain->use--;
 383                 return 0;
 384         }
 385         return -ENOENT;
 386 }
 387
 388 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 389                                             struct nft_rule *rule)
 390 {
 391         struct nft_trans *trans;
 392
 393         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 394         if (trans == NULL)
 395                 return NULL;
 396
 397         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 398                 nft_trans_rule_id(trans) =
 399                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 400         }
 401         nft_trans_rule(trans) = rule;
 402         nft_trans_commit_list_add_tail(ctx->net, trans);
 403
 404         return trans;
 405 }
 406
 407 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 408 {
 409         struct nft_flow_rule *flow;
 410         struct nft_trans *trans;
 411         int err;
 412
 413         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 414         if (trans == NULL)
 415                 return -ENOMEM;
 416
 417         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 418                 flow = nft_flow_rule_create(ctx->net, rule);
 419                 if (IS_ERR(flow)) {
 420                         nft_trans_destroy(trans);
 421                         return PTR_ERR(flow);
 422                 }
 423
 424                 nft_trans_flow_rule(trans) = flow;
 425         }
 426
 427         err = nf_tables_delrule_deactivate(ctx, rule);
 428         if (err < 0) {
 429                 nft_trans_destroy(trans);
 430                 return err;
 431         }
 432         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 433
 434         return 0;
 435 }
 436
 437 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 438 {
 439         struct nft_rule *rule;
 440         int err;
 441
 442         list_for_each_entry(rule, &ctx->chain->rules, list) {
 443                 if (!nft_is_active_next(ctx->net, rule))
 444                         continue;
 445
 446                 err = nft_delrule(ctx, rule);
 447                 if (err < 0)
 448                         return err;
 449         }
 450         return 0;
 451 }
 452
 453 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 454                              struct nft_set *set)
 455 {
 456         struct nft_trans *trans;
 457
 458         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 459         if (trans == NULL)
 460                 return -ENOMEM;
 461
 462         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 463                 nft_trans_set_id(trans) =
 464                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 465                 nft_activate_next(ctx->net, set);
 466         }
 467         nft_trans_set(trans) = set;
 468         nft_trans_commit_list_add_tail(ctx->net, trans);
 469
 470         return 0;
 471 }
 472
 473 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 474 {
 475         int err;
 476
 477         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 478         if (err < 0)
 479                 return err;
 480
 481         nft_deactivate_next(ctx->net, set);
 482         ctx->table->use--;
 483
 484         return err;
 485 }
 486
 487 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 488                              struct nft_object *obj)
 489 {
 490         struct nft_trans *trans;
 491
 492         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 493         if (trans == NULL)
 494                 return -ENOMEM;
 495
 496         if (msg_type == NFT_MSG_NEWOBJ)
 497                 nft_activate_next(ctx->net, obj);
 498
 499         nft_trans_obj(trans) = obj;
 500         nft_trans_commit_list_add_tail(ctx->net, trans);
 501
 502         return 0;
 503 }
 504
 505 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 506 {
 507         int err;
 508
 509         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 510         if (err < 0)
 511                 return err;
 512
 513         nft_deactivate_next(ctx->net, obj);
 514         ctx->table->use--;
 515
 516         return err;
 517 }
 518
 519 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 520                                    struct nft_flowtable *flowtable)
 521 {
 522         struct nft_trans *trans;
 523
 524         trans = nft_trans_alloc(ctx, msg_type,
 525                                 sizeof(struct nft_trans_flowtable));
 526         if (trans == NULL)
 527                 return -ENOMEM;
 528
 529         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 530                 nft_activate_next(ctx->net, flowtable);
 531
 532         nft_trans_flowtable(trans) = flowtable;
 533         nft_trans_commit_list_add_tail(ctx->net, trans);
 534
 535         return 0;
 536 }
 537
 538 static int nft_delflowtable(struct nft_ctx *ctx,
 539                             struct nft_flowtable *flowtable)
 540 {
 541         int err;
 542
 543         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 544         if (err < 0)
 545                 return err;
 546
 547         nft_deactivate_next(ctx->net, flowtable);
 548         ctx->table->use--;
 549
 550         return err;
 551 }
 552
 553 /*
 554  * Tables
 555  */
 556
 557 static struct nft_table *nft_table_lookup(const struct net *net,
 558                                           const struct nlattr *nla,
 559                                           u8 family, u8 genmask, u32 nlpid)
 560 {
 561         struct nftables_pernet *nft_net;
 562         struct nft_table *table;
 563
 564         if (nla == NULL)
 565                 return ERR_PTR(-EINVAL);
 566
 567         nft_net = nft_pernet(net);
 568         list_for_each_entry_rcu(table, &nft_net->tables, list,
 569                                 lockdep_is_held(&nft_net->commit_mutex)) {
 570                 if (!nla_strcmp(nla, table->name) &&
 571                     table->family == family &&
 572                     nft_active_genmask(table, genmask)) {
 573                         if (nft_table_has_owner(table) &&
 574                             nlpid && table->nlpid != nlpid)
 575                                 return ERR_PTR(-EPERM);
 576
 577                         return table;
 578                 }
 579         }
 580
 581         return ERR_PTR(-ENOENT);
 582 }
 583
 584 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 585                                                    const struct nlattr *nla,
 586                                                    u8 genmask, u32 nlpid)
 587 {
 588         struct nftables_pernet *nft_net;
 589         struct nft_table *table;
 590
 591         nft_net = nft_pernet(net);
 592         list_for_each_entry(table, &nft_net->tables, list) {
 593                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 594                     nft_active_genmask(table, genmask)) {
 595                         if (nft_table_has_owner(table) &&
 596                             nlpid && table->nlpid != nlpid)
 597                                 return ERR_PTR(-EPERM);
 598
 599                         return table;
 600                 }
 601         }
 602
 603         return ERR_PTR(-ENOENT);
 604 }
 605
 606 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 607 {
 608         return ++table->hgenerator;
 609 }
 610
 611 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 612
 613 static const struct nft_chain_type *
 614 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 615 {
 616         if (family >= NFPROTO_NUMPROTO ||
 617             type >= NFT_CHAIN_T_MAX)
 618                 return NULL;
 619
 620         return chain_type[family][type];
 621 }
 622
 623 static const struct nft_chain_type *
 624 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 625 {
 626         const struct nft_chain_type *type;
 627         int i;
 628
 629         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 630                 type = __nft_chain_type_get(family, i);
 631                 if (!type)
 632                         continue;
 633                 if (!nla_strcmp(nla, type->name))
 634                         return type;
 635         }
 636         return NULL;
 637 }
 638
 639 struct nft_module_request {
 640         struct list_head        list;
 641         char                    module[MODULE_NAME_LEN];
 642         bool                    done;
 643 };
 644
 645 #ifdef CONFIG_MODULES
 646 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 647                                       ...)
 648 {
 649         char module_name[MODULE_NAME_LEN];
 650         struct nftables_pernet *nft_net;
 651         struct nft_module_request *req;
 652         va_list args;
 653         int ret;
 654
 655         va_start(args, fmt);
 656         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 657         va_end(args);
 658         if (ret >= MODULE_NAME_LEN)
 659                 return 0;
 660
 661         nft_net = nft_pernet(net);
 662         list_for_each_entry(req, &nft_net->module_list, list) {
 663                 if (!strcmp(req->module, module_name)) {
 664                         if (req->done)
 665                                 return 0;
 666
 667                         /* A request to load this module already exists. */
 668                         return -EAGAIN;
 669                 }
 670         }
 671
 672         req = kmalloc(sizeof(*req), GFP_KERNEL);
 673         if (!req)
 674                 return -ENOMEM;
 675
 676         req->done = false;
 677         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 678         list_add_tail(&req->list, &nft_net->module_list);
 679
 680         return -EAGAIN;
 681 }
 682 EXPORT_SYMBOL_GPL(nft_request_module);
 683 #endif
 684
 685 static void lockdep_nfnl_nft_mutex_not_held(void)
 686 {
 687 #ifdef CONFIG_PROVE_LOCKING
 688         if (debug_locks)
 689                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 690 #endif
 691 }
 692
 693 static const struct nft_chain_type *
 694 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 695                             u8 family, bool autoload)
 696 {
 697         const struct nft_chain_type *type;
 698
 699         type = __nf_tables_chain_type_lookup(nla, family);
 700         if (type != NULL)
 701                 return type;
 702
 703         lockdep_nfnl_nft_mutex_not_held();
 704 #ifdef CONFIG_MODULES
 705         if (autoload) {
 706                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 707                                        nla_len(nla),
 708                                        (const char *)nla_data(nla)) == -EAGAIN)
 709                         return ERR_PTR(-EAGAIN);
 710         }
 711 #endif
 712         return ERR_PTR(-ENOENT);
 713 }
 714
 715 static __be16 nft_base_seq(const struct net *net)
 716 {
 717         struct nftables_pernet *nft_net = nft_pernet(net);
 718
 719         return htons(nft_net->base_seq & 0xffff);
 720 }
 721
 722 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 723         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 724                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 725         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 726         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 727         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 728                                     .len = NFT_USERDATA_MAXLEN }
 729 };
 730
 731 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 732                                      u32 portid, u32 seq, int event, u32 flags,
 733                                      int family, const struct nft_table *table)
 734 {
 735         struct nlmsghdr *nlh;
 736
 737         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 738         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 739                            NFNETLINK_V0, nft_base_seq(net));
 740         if (!nlh)
 741                 goto nla_put_failure;
 742
 743         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 744             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 745                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 746             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 747             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 748                          NFTA_TABLE_PAD))
 749                 goto nla_put_failure;
 750         if (nft_table_has_owner(table) &&
 751             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 752                 goto nla_put_failure;
 753
 754         if (table->udata) {
 755                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 756                         goto nla_put_failure;
 757         }
 758
 759         nlmsg_end(skb, nlh);
 760         return 0;
 761
 762 nla_put_failure:
 763         nlmsg_trim(skb, nlh);
 764         return -1;
 765 }
 766
 767 struct nftnl_skb_parms {
 768         bool report;
 769 };
 770 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 771
 772 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 773                                struct list_head *notify_list)
 774 {
 775         NFT_CB(skb).report = report;
 776         list_add_tail(&skb->list, notify_list);
 777 }
 778
 779 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 780 {
 781         struct nftables_pernet *nft_net;
 782         struct sk_buff *skb;
 783         u16 flags = 0;
 784         int err;
 785
 786         if (!ctx->report &&
 787             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 788                 return;
 789
 790         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 791         if (skb == NULL)
 792                 goto err;
 793
 794         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 795                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 796
 797         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 798                                         event, flags, ctx->family, ctx->table);
 799         if (err < 0) {
 800                 kfree_skb(skb);
 801                 goto err;
 802         }
 803
 804         nft_net = nft_pernet(ctx->net);
 805         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 806         return;
 807 err:
 808         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 809 }
 810
 811 static int nf_tables_dump_tables(struct sk_buff *skb,
 812                                  struct netlink_callback *cb)
 813 {
 814         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 815         struct nftables_pernet *nft_net;
 816         const struct nft_table *table;
 817         unsigned int idx = 0, s_idx = cb->args[0];
 818         struct net *net = sock_net(skb->sk);
 819         int family = nfmsg->nfgen_family;
 820
 821         rcu_read_lock();
 822         nft_net = nft_pernet(net);
 823         cb->seq = nft_net->base_seq;
 824
 825         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 826                 if (family != NFPROTO_UNSPEC && family != table->family)
 827                         continue;
 828
 829                 if (idx < s_idx)
 830                         goto cont;
 831                 if (idx > s_idx)
 832                         memset(&cb->args[1], 0,
 833                                sizeof(cb->args) - sizeof(cb->args[0]));
 834                 if (!nft_is_active(net, table))
 835                         continue;
 836                 if (nf_tables_fill_table_info(skb, net,
 837                                               NETLINK_CB(cb->skb).portid,
 838                                               cb->nlh->nlmsg_seq,
 839                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 840                                               table->family, table) < 0)
 841                         goto done;
 842
 843                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 844 cont:
 845                 idx++;
 846         }
 847 done:
 848         rcu_read_unlock();
 849         cb->args[0] = idx;
 850         return skb->len;
 851 }
 852
 853 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 854                                       const struct nlmsghdr *nlh,
 855                                       struct netlink_dump_control *c)
 856 {
 857         int err;
 858
 859         if (!try_module_get(THIS_MODULE))
 860                 return -EINVAL;
 861
 862         rcu_read_unlock();
 863         err = netlink_dump_start(nlsk, skb, nlh, c);
 864         rcu_read_lock();
 865         module_put(THIS_MODULE);
 866
 867         return err;
 868 }
 869
 870 /* called with rcu_read_lock held */
 871 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 872                               const struct nlattr * const nla[])
 873 {
 874         struct netlink_ext_ack *extack = info->extack;
 875         u8 genmask = nft_genmask_cur(info->net);
 876         u8 family = info->nfmsg->nfgen_family;
 877         const struct nft_table *table;
 878         struct net *net = info->net;
 879         struct sk_buff *skb2;
 880         int err;
 881
 882         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 883                 struct netlink_dump_control c = {
 884                         .dump = nf_tables_dump_tables,
 885                         .module = THIS_MODULE,
 886                 };
 887
 888                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 889         }
 890
 891         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 892         if (IS_ERR(table)) {
 893                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 894                 return PTR_ERR(table);
 895         }
 896
 897         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 898         if (!skb2)
 899                 return -ENOMEM;
 900
 901         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 902                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 903                                         0, family, table);
 904         if (err < 0)
 905                 goto err_fill_table_info;
 906
 907         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 908
 909 err_fill_table_info:
 910         kfree_skb(skb2);
 911         return err;
 912 }
 913
 914 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 915 {
 916         struct nft_chain *chain;
 917         u32 i = 0;
 918
 919         list_for_each_entry(chain, &table->chains, list) {
 920                 if (!nft_is_active_next(net, chain))
 921                         continue;
 922                 if (!nft_is_base_chain(chain))
 923                         continue;
 924
 925                 if (cnt && i++ == cnt)
 926                         break;
 927
 928                 nf_tables_unregister_hook(net, table, chain);
 929         }
 930 }
 931
 932 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
 933 {
 934         struct nft_chain *chain;
 935         int err, i = 0;
 936
 937         list_for_each_entry(chain, &table->chains, list) {
 938                 if (!nft_is_active_next(net, chain))
 939                         continue;
 940                 if (!nft_is_base_chain(chain))
 941                         continue;
 942
 943                 err = nf_tables_register_hook(net, table, chain);
 944                 if (err < 0)
 945                         goto err_register_hooks;
 946
 947                 i++;
 948         }
 949         return 0;
 950
 951 err_register_hooks:
 952         if (i)
 953                 nft_table_disable(net, table, i);
 954         return err;
 955 }
 956
 957 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
 958 {
 959         table->flags &= ~NFT_TABLE_F_DORMANT;
 960         nft_table_disable(net, table, 0);
 961         table->flags |= NFT_TABLE_F_DORMANT;
 962 }
 963
 964 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
 965 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
 966 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
 967 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
 968                                          __NFT_TABLE_F_WAS_AWAKEN)
 969
 970 static int nf_tables_updtable(struct nft_ctx *ctx)
 971 {
 972         struct nft_trans *trans;
 973         u32 flags;
 974         int ret;
 975
 976         if (!ctx->nla[NFTA_TABLE_FLAGS])
 977                 return 0;
 978
 979         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
 980         if (flags & ~NFT_TABLE_F_MASK)
 981                 return -EOPNOTSUPP;
 982
 983         if (flags == ctx->table->flags)
 984                 return 0;
 985
 986         if ((nft_table_has_owner(ctx->table) &&
 987              !(flags & NFT_TABLE_F_OWNER)) ||
 988             (!nft_table_has_owner(ctx->table) &&
 989              flags & NFT_TABLE_F_OWNER))
 990                 return -EOPNOTSUPP;
 991
 992         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 993                                 sizeof(struct nft_trans_table));
 994         if (trans == NULL)
 995                 return -ENOMEM;
 996
 997         if ((flags & NFT_TABLE_F_DORMANT) &&
 998             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
 999                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1000                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1001                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1002         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1003                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1004                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1005                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1006                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1007                         if (ret < 0)
1008                                 goto err_register_hooks;
1009
1010                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1011                 }
1012         }
1013
1014         nft_trans_table_update(trans) = true;
1015         nft_trans_commit_list_add_tail(ctx->net, trans);
1016
1017         return 0;
1018
1019 err_register_hooks:
1020         nft_trans_destroy(trans);
1021         return ret;
1022 }
1023
1024 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1025 {
1026         const char *name = data;
1027
1028         return jhash(name, strlen(name), seed);
1029 }
1030
1031 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1032 {
1033         const struct nft_chain *chain = data;
1034
1035         return nft_chain_hash(chain->name, 0, seed);
1036 }
1037
1038 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1039                               const void *ptr)
1040 {
1041         const struct nft_chain *chain = ptr;
1042         const char *name = arg->key;
1043
1044         return strcmp(chain->name, name);
1045 }
1046
1047 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1048 {
1049         const struct nft_object_hash_key *k = data;
1050
1051         seed ^= hash_ptr(k->table, 32);
1052
1053         return jhash(k->name, strlen(k->name), seed);
1054 }
1055
1056 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1057 {
1058         const struct nft_object *obj = data;
1059
1060         return nft_objname_hash(&obj->key, 0, seed);
1061 }
1062
1063 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1064                                 const void *ptr)
1065 {
1066         const struct nft_object_hash_key *k = arg->key;
1067         const struct nft_object *obj = ptr;
1068
1069         if (obj->key.table != k->table)
1070                 return -1;
1071
1072         return strcmp(obj->key.name, k->name);
1073 }
1074
1075 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1076                               const struct nlattr * const nla[])
1077 {
1078         struct nftables_pernet *nft_net = nft_pernet(info->net);
1079         struct netlink_ext_ack *extack = info->extack;
1080         u8 genmask = nft_genmask_next(info->net);
1081         u8 family = info->nfmsg->nfgen_family;
1082         struct net *net = info->net;
1083         const struct nlattr *attr;
1084         struct nft_table *table;
1085         struct nft_ctx ctx;
1086         u32 flags = 0;
1087         int err;
1088
1089         lockdep_assert_held(&nft_net->commit_mutex);
1090         attr = nla[NFTA_TABLE_NAME];
1091         table = nft_table_lookup(net, attr, family, genmask,
1092                                  NETLINK_CB(skb).portid);
1093         if (IS_ERR(table)) {
1094                 if (PTR_ERR(table) != -ENOENT)
1095                         return PTR_ERR(table);
1096         } else {
1097                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1098                         NL_SET_BAD_ATTR(extack, attr);
1099                         return -EEXIST;
1100                 }
1101                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1102                         return -EOPNOTSUPP;
1103
1104                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1105
1106                 return nf_tables_updtable(&ctx);
1107         }
1108
1109         if (nla[NFTA_TABLE_FLAGS]) {
1110                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1111                 if (flags & ~NFT_TABLE_F_MASK)
1112                         return -EOPNOTSUPP;
1113         }
1114
1115         err = -ENOMEM;
1116         table = kzalloc(sizeof(*table), GFP_KERNEL);
1117         if (table == NULL)
1118                 goto err_kzalloc;
1119
1120         table->name = nla_strdup(attr, GFP_KERNEL);
1121         if (table->name == NULL)
1122                 goto err_strdup;
1123
1124         if (nla[NFTA_TABLE_USERDATA]) {
1125                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1126                 if (table->udata == NULL)
1127                         goto err_table_udata;
1128
1129                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1130         }
1131
1132         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1133         if (err)
1134                 goto err_chain_ht;
1135
1136         INIT_LIST_HEAD(&table->chains);
1137         INIT_LIST_HEAD(&table->sets);
1138         INIT_LIST_HEAD(&table->objects);
1139         INIT_LIST_HEAD(&table->flowtables);
1140         table->family = family;
1141         table->flags = flags;
1142         table->handle = ++table_handle;
1143         if (table->flags & NFT_TABLE_F_OWNER)
1144                 table->nlpid = NETLINK_CB(skb).portid;
1145
1146         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1147         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1148         if (err < 0)
1149                 goto err_trans;
1150
1151         list_add_tail_rcu(&table->list, &nft_net->tables);
1152         return 0;
1153 err_trans:
1154         rhltable_destroy(&table->chains_ht);
1155 err_chain_ht:
1156         kfree(table->udata);
1157 err_table_udata:
1158         kfree(table->name);
1159 err_strdup:
1160         kfree(table);
1161 err_kzalloc:
1162         return err;
1163 }
1164
1165 static int nft_flush_table(struct nft_ctx *ctx)
1166 {
1167         struct nft_flowtable *flowtable, *nft;
1168         struct nft_chain *chain, *nc;
1169         struct nft_object *obj, *ne;
1170         struct nft_set *set, *ns;
1171         int err;
1172
1173         list_for_each_entry(chain, &ctx->table->chains, list) {
1174                 if (!nft_is_active_next(ctx->net, chain))
1175                         continue;
1176
1177                 if (nft_chain_is_bound(chain))
1178                         continue;
1179
1180                 ctx->chain = chain;
1181
1182                 err = nft_delrule_by_chain(ctx);
1183                 if (err < 0)
1184                         goto out;
1185         }
1186
1187         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1188                 if (!nft_is_active_next(ctx->net, set))
1189                         continue;
1190
1191                 if (nft_set_is_anonymous(set) &&
1192                     !list_empty(&set->bindings))
1193                         continue;
1194
1195                 err = nft_delset(ctx, set);
1196                 if (err < 0)
1197                         goto out;
1198         }
1199
1200         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1201                 if (!nft_is_active_next(ctx->net, flowtable))
1202                         continue;
1203
1204                 err = nft_delflowtable(ctx, flowtable);
1205                 if (err < 0)
1206                         goto out;
1207         }
1208
1209         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1210                 if (!nft_is_active_next(ctx->net, obj))
1211                         continue;
1212
1213                 err = nft_delobj(ctx, obj);
1214                 if (err < 0)
1215                         goto out;
1216         }
1217
1218         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1219                 if (!nft_is_active_next(ctx->net, chain))
1220                         continue;
1221
1222                 if (nft_chain_is_bound(chain))
1223                         continue;
1224
1225                 ctx->chain = chain;
1226
1227                 err = nft_delchain(ctx);
1228                 if (err < 0)
1229                         goto out;
1230         }
1231
1232         err = nft_deltable(ctx);
1233 out:
1234         return err;
1235 }
1236
1237 static int nft_flush(struct nft_ctx *ctx, int family)
1238 {
1239         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1240         const struct nlattr * const *nla = ctx->nla;
1241         struct nft_table *table, *nt;
1242         int err = 0;
1243
1244         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1245                 if (family != AF_UNSPEC && table->family != family)
1246                         continue;
1247
1248                 ctx->family = table->family;
1249
1250                 if (!nft_is_active_next(ctx->net, table))
1251                         continue;
1252
1253                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1254                         continue;
1255
1256                 if (nla[NFTA_TABLE_NAME] &&
1257                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1258                         continue;
1259
1260                 ctx->table = table;
1261
1262                 err = nft_flush_table(ctx);
1263                 if (err < 0)
1264                         goto out;
1265         }
1266 out:
1267         return err;
1268 }
1269
1270 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1271                               const struct nlattr * const nla[])
1272 {
1273         struct netlink_ext_ack *extack = info->extack;
1274         u8 genmask = nft_genmask_next(info->net);
1275         u8 family = info->nfmsg->nfgen_family;
1276         struct net *net = info->net;
1277         const struct nlattr *attr;
1278         struct nft_table *table;
1279         struct nft_ctx ctx;
1280
1281         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1282         if (family == AF_UNSPEC ||
1283             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1284                 return nft_flush(&ctx, family);
1285
1286         if (nla[NFTA_TABLE_HANDLE]) {
1287                 attr = nla[NFTA_TABLE_HANDLE];
1288                 table = nft_table_lookup_byhandle(net, attr, genmask,
1289                                                   NETLINK_CB(skb).portid);
1290         } else {
1291                 attr = nla[NFTA_TABLE_NAME];
1292                 table = nft_table_lookup(net, attr, family, genmask,
1293                                          NETLINK_CB(skb).portid);
1294         }
1295
1296         if (IS_ERR(table)) {
1297                 NL_SET_BAD_ATTR(extack, attr);
1298                 return PTR_ERR(table);
1299         }
1300
1301         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1302             table->use > 0)
1303                 return -EBUSY;
1304
1305         ctx.family = family;
1306         ctx.table = table;
1307
1308         return nft_flush_table(&ctx);
1309 }
1310
1311 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1312 {
1313         if (WARN_ON(ctx->table->use > 0))
1314                 return;
1315
1316         rhltable_destroy(&ctx->table->chains_ht);
1317         kfree(ctx->table->name);
1318         kfree(ctx->table->udata);
1319         kfree(ctx->table);
1320 }
1321
1322 void nft_register_chain_type(const struct nft_chain_type *ctype)
1323 {
1324         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1325         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1326                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1327                 return;
1328         }
1329         chain_type[ctype->family][ctype->type] = ctype;
1330         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1331 }
1332 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1333
1334 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1335 {
1336         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1337         chain_type[ctype->family][ctype->type] = NULL;
1338         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1339 }
1340 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1341
1342 /*
1343  * Chains
1344  */
1345
1346 static struct nft_chain *
1347 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1348 {
1349         struct nft_chain *chain;
1350
1351         list_for_each_entry(chain, &table->chains, list) {
1352                 if (chain->handle == handle &&
1353                     nft_active_genmask(chain, genmask))
1354                         return chain;
1355         }
1356
1357         return ERR_PTR(-ENOENT);
1358 }
1359
1360 static bool lockdep_commit_lock_is_held(const struct net *net)
1361 {
1362 #ifdef CONFIG_PROVE_LOCKING
1363         struct nftables_pernet *nft_net = nft_pernet(net);
1364
1365         return lockdep_is_held(&nft_net->commit_mutex);
1366 #else
1367         return true;
1368 #endif
1369 }
1370
1371 static struct nft_chain *nft_chain_lookup(struct net *net,
1372                                           struct nft_table *table,
1373                                           const struct nlattr *nla, u8 genmask)
1374 {
1375         char search[NFT_CHAIN_MAXNAMELEN + 1];
1376         struct rhlist_head *tmp, *list;
1377         struct nft_chain *chain;
1378
1379         if (nla == NULL)
1380                 return ERR_PTR(-EINVAL);
1381
1382         nla_strscpy(search, nla, sizeof(search));
1383
1384         WARN_ON(!rcu_read_lock_held() &&
1385                 !lockdep_commit_lock_is_held(net));
1386
1387         chain = ERR_PTR(-ENOENT);
1388         rcu_read_lock();
1389         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1390         if (!list)
1391                 goto out_unlock;
1392
1393         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1394                 if (nft_active_genmask(chain, genmask))
1395                         goto out_unlock;
1396         }
1397         chain = ERR_PTR(-ENOENT);
1398 out_unlock:
1399         rcu_read_unlock();
1400         return chain;
1401 }
1402
1403 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1404         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1405                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1406         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1407         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1408                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1409         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1410         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1411         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1412                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1413         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1414         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1415         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1416         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1417                                     .len = NFT_USERDATA_MAXLEN },
1418 };
1419
1420 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1421         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1422         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1423         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1424                                     .len = IFNAMSIZ - 1 },
1425 };
1426
1427 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1428 {
1429         struct nft_stats *cpu_stats, total;
1430         struct nlattr *nest;
1431         unsigned int seq;
1432         u64 pkts, bytes;
1433         int cpu;
1434
1435         if (!stats)
1436                 return 0;
1437
1438         memset(&total, 0, sizeof(total));
1439         for_each_possible_cpu(cpu) {
1440                 cpu_stats = per_cpu_ptr(stats, cpu);
1441                 do {
1442                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1443                         pkts = cpu_stats->pkts;
1444                         bytes = cpu_stats->bytes;
1445                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1446                 total.pkts += pkts;
1447                 total.bytes += bytes;
1448         }
1449         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1450         if (nest == NULL)
1451                 goto nla_put_failure;
1452
1453         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1454                          NFTA_COUNTER_PAD) ||
1455             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1456                          NFTA_COUNTER_PAD))
1457                 goto nla_put_failure;
1458
1459         nla_nest_end(skb, nest);
1460         return 0;
1461
1462 nla_put_failure:
1463         return -ENOSPC;
1464 }
1465
1466 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1467                                    const struct nft_base_chain *basechain)
1468 {
1469         const struct nf_hook_ops *ops = &basechain->ops;
1470         struct nft_hook *hook, *first = NULL;
1471         struct nlattr *nest, *nest_devs;
1472         int n = 0;
1473
1474         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1475         if (nest == NULL)
1476                 goto nla_put_failure;
1477         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1478                 goto nla_put_failure;
1479         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1480                 goto nla_put_failure;
1481
1482         if (nft_base_chain_netdev(family, ops->hooknum)) {
1483                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1484                 list_for_each_entry(hook, &basechain->hook_list, list) {
1485                         if (!first)
1486                                 first = hook;
1487
1488                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1489                                            hook->ops.dev->name))
1490                                 goto nla_put_failure;
1491                         n++;
1492                 }
1493                 nla_nest_end(skb, nest_devs);
1494
1495                 if (n == 1 &&
1496                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1497                         goto nla_put_failure;
1498         }
1499         nla_nest_end(skb, nest);
1500
1501         return 0;
1502 nla_put_failure:
1503         return -1;
1504 }
1505
1506 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1507                                      u32 portid, u32 seq, int event, u32 flags,
1508                                      int family, const struct nft_table *table,
1509                                      const struct nft_chain *chain)
1510 {
1511         struct nlmsghdr *nlh;
1512
1513         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1514         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1515                            NFNETLINK_V0, nft_base_seq(net));
1516         if (!nlh)
1517                 goto nla_put_failure;
1518
1519         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1520                 goto nla_put_failure;
1521         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1522                          NFTA_CHAIN_PAD))
1523                 goto nla_put_failure;
1524         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1525                 goto nla_put_failure;
1526
1527         if (nft_is_base_chain(chain)) {
1528                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1529                 struct nft_stats __percpu *stats;
1530
1531                 if (nft_dump_basechain_hook(skb, family, basechain))
1532                         goto nla_put_failure;
1533
1534                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1535                                  htonl(basechain->policy)))
1536                         goto nla_put_failure;
1537
1538                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1539                         goto nla_put_failure;
1540
1541                 stats = rcu_dereference_check(basechain->stats,
1542                                               lockdep_commit_lock_is_held(net));
1543                 if (nft_dump_stats(skb, stats))
1544                         goto nla_put_failure;
1545         }
1546
1547         if (chain->flags &&
1548             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1549                 goto nla_put_failure;
1550
1551         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1552                 goto nla_put_failure;
1553
1554         if (chain->udata &&
1555             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1556                 goto nla_put_failure;
1557
1558         nlmsg_end(skb, nlh);
1559         return 0;
1560
1561 nla_put_failure:
1562         nlmsg_trim(skb, nlh);
1563         return -1;
1564 }
1565
1566 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1567 {
1568         struct nftables_pernet *nft_net;
1569         struct sk_buff *skb;
1570         u16 flags = 0;
1571         int err;
1572
1573         if (!ctx->report &&
1574             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1575                 return;
1576
1577         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1578         if (skb == NULL)
1579                 goto err;
1580
1581         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1582                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1583
1584         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1585                                         event, flags, ctx->family, ctx->table,
1586                                         ctx->chain);
1587         if (err < 0) {
1588                 kfree_skb(skb);
1589                 goto err;
1590         }
1591
1592         nft_net = nft_pernet(ctx->net);
1593         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1594         return;
1595 err:
1596         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1597 }
1598
1599 static int nf_tables_dump_chains(struct sk_buff *skb,
1600                                  struct netlink_callback *cb)
1601 {
1602         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1603         unsigned int idx = 0, s_idx = cb->args[0];
1604         struct net *net = sock_net(skb->sk);
1605         int family = nfmsg->nfgen_family;
1606         struct nftables_pernet *nft_net;
1607         const struct nft_table *table;
1608         const struct nft_chain *chain;
1609
1610         rcu_read_lock();
1611         nft_net = nft_pernet(net);
1612         cb->seq = nft_net->base_seq;
1613
1614         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1615                 if (family != NFPROTO_UNSPEC && family != table->family)
1616                         continue;
1617
1618                 list_for_each_entry_rcu(chain, &table->chains, list) {
1619                         if (idx < s_idx)
1620                                 goto cont;
1621                         if (idx > s_idx)
1622                                 memset(&cb->args[1], 0,
1623                                        sizeof(cb->args) - sizeof(cb->args[0]));
1624                         if (!nft_is_active(net, chain))
1625                                 continue;
1626                         if (nf_tables_fill_chain_info(skb, net,
1627                                                       NETLINK_CB(cb->skb).portid,
1628                                                       cb->nlh->nlmsg_seq,
1629                                                       NFT_MSG_NEWCHAIN,
1630                                                       NLM_F_MULTI,
1631                                                       table->family, table,
1632                                                       chain) < 0)
1633                                 goto done;
1634
1635                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1636 cont:
1637                         idx++;
1638                 }
1639         }
1640 done:
1641         rcu_read_unlock();
1642         cb->args[0] = idx;
1643         return skb->len;
1644 }
1645
1646 /* called with rcu_read_lock held */
1647 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1648                               const struct nlattr * const nla[])
1649 {
1650         struct netlink_ext_ack *extack = info->extack;
1651         u8 genmask = nft_genmask_cur(info->net);
1652         u8 family = info->nfmsg->nfgen_family;
1653         const struct nft_chain *chain;
1654         struct net *net = info->net;
1655         struct nft_table *table;
1656         struct sk_buff *skb2;
1657         int err;
1658
1659         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1660                 struct netlink_dump_control c = {
1661                         .dump = nf_tables_dump_chains,
1662                         .module = THIS_MODULE,
1663                 };
1664
1665                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1666         }
1667
1668         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1669         if (IS_ERR(table)) {
1670                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1671                 return PTR_ERR(table);
1672         }
1673
1674         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1675         if (IS_ERR(chain)) {
1676                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1677                 return PTR_ERR(chain);
1678         }
1679
1680         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1681         if (!skb2)
1682                 return -ENOMEM;
1683
1684         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1685                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1686                                         0, family, table, chain);
1687         if (err < 0)
1688                 goto err_fill_chain_info;
1689
1690         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1691
1692 err_fill_chain_info:
1693         kfree_skb(skb2);
1694         return err;
1695 }
1696
1697 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1698         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1699         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1700 };
1701
1702 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1703 {
1704         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1705         struct nft_stats __percpu *newstats;
1706         struct nft_stats *stats;
1707         int err;
1708
1709         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1710                                           nft_counter_policy, NULL);
1711         if (err < 0)
1712                 return ERR_PTR(err);
1713
1714         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1715                 return ERR_PTR(-EINVAL);
1716
1717         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1718         if (newstats == NULL)
1719                 return ERR_PTR(-ENOMEM);
1720
1721         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1722          * are not exposed to userspace.
1723          */
1724         preempt_disable();
1725         stats = this_cpu_ptr(newstats);
1726         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1727         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1728         preempt_enable();
1729
1730         return newstats;
1731 }
1732
1733 static void nft_chain_stats_replace(struct nft_trans *trans)
1734 {
1735         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1736
1737         if (!nft_trans_chain_stats(trans))
1738                 return;
1739
1740         nft_trans_chain_stats(trans) =
1741                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1742                                     lockdep_commit_lock_is_held(trans->ctx.net));
1743
1744         if (!nft_trans_chain_stats(trans))
1745                 static_branch_inc(&nft_counters_enabled);
1746 }
1747
1748 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1749 {
1750         struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1751         struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1752
1753         if (g0 != g1)
1754                 kvfree(g1);
1755         kvfree(g0);
1756
1757         /* should be NULL either via abort or via successful commit */
1758         WARN_ON_ONCE(chain->rules_next);
1759         kvfree(chain->rules_next);
1760 }
1761
1762 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1763 {
1764         struct nft_chain *chain = ctx->chain;
1765         struct nft_hook *hook, *next;
1766
1767         if (WARN_ON(chain->use > 0))
1768                 return;
1769
1770         /* no concurrent access possible anymore */
1771         nf_tables_chain_free_chain_rules(chain);
1772
1773         if (nft_is_base_chain(chain)) {
1774                 struct nft_base_chain *basechain = nft_base_chain(chain);
1775
1776                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1777                         list_for_each_entry_safe(hook, next,
1778                                                  &basechain->hook_list, list) {
1779                                 list_del_rcu(&hook->list);
1780                                 kfree_rcu(hook, rcu);
1781                         }
1782                 }
1783                 module_put(basechain->type->owner);
1784                 if (rcu_access_pointer(basechain->stats)) {
1785                         static_branch_dec(&nft_counters_enabled);
1786                         free_percpu(rcu_dereference_raw(basechain->stats));
1787                 }
1788                 kfree(chain->name);
1789                 kfree(chain->udata);
1790                 kfree(basechain);
1791         } else {
1792                 kfree(chain->name);
1793                 kfree(chain->udata);
1794                 kfree(chain);
1795         }
1796 }
1797
1798 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1799                                               const struct nlattr *attr)
1800 {
1801         struct net_device *dev;
1802         char ifname[IFNAMSIZ];
1803         struct nft_hook *hook;
1804         int err;
1805
1806         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1807         if (!hook) {
1808                 err = -ENOMEM;
1809                 goto err_hook_alloc;
1810         }
1811
1812         nla_strscpy(ifname, attr, IFNAMSIZ);
1813         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1814          * indirectly serializing all the other holders of the commit_mutex with
1815          * the rtnl_mutex.
1816          */
1817         dev = __dev_get_by_name(net, ifname);
1818         if (!dev) {
1819                 err = -ENOENT;
1820                 goto err_hook_dev;
1821         }
1822         hook->ops.dev = dev;
1823         hook->inactive = false;
1824
1825         return hook;
1826
1827 err_hook_dev:
1828         kfree(hook);
1829 err_hook_alloc:
1830         return ERR_PTR(err);
1831 }
1832
1833 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1834                                            const struct nft_hook *this)
1835 {
1836         struct nft_hook *hook;
1837
1838         list_for_each_entry(hook, hook_list, list) {
1839                 if (this->ops.dev == hook->ops.dev)
1840                         return hook;
1841         }
1842
1843         return NULL;
1844 }
1845
1846 static int nf_tables_parse_netdev_hooks(struct net *net,
1847                                         const struct nlattr *attr,
1848                                         struct list_head *hook_list)
1849 {
1850         struct nft_hook *hook, *next;
1851         const struct nlattr *tmp;
1852         int rem, n = 0, err;
1853
1854         nla_for_each_nested(tmp, attr, rem) {
1855                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1856                         err = -EINVAL;
1857                         goto err_hook;
1858                 }
1859
1860                 hook = nft_netdev_hook_alloc(net, tmp);
1861                 if (IS_ERR(hook)) {
1862                         err = PTR_ERR(hook);
1863                         goto err_hook;
1864                 }
1865                 if (nft_hook_list_find(hook_list, hook)) {
1866                         kfree(hook);
1867                         err = -EEXIST;
1868                         goto err_hook;
1869                 }
1870                 list_add_tail(&hook->list, hook_list);
1871                 n++;
1872
1873                 if (n == NFT_NETDEVICE_MAX) {
1874                         err = -EFBIG;
1875                         goto err_hook;
1876                 }
1877         }
1878
1879         return 0;
1880
1881 err_hook:
1882         list_for_each_entry_safe(hook, next, hook_list, list) {
1883                 list_del(&hook->list);
1884                 kfree(hook);
1885         }
1886         return err;
1887 }
1888
1889 struct nft_chain_hook {
1890         u32                             num;
1891         s32                             priority;
1892         const struct nft_chain_type     *type;
1893         struct list_head                list;
1894 };
1895
1896 static int nft_chain_parse_netdev(struct net *net,
1897                                   struct nlattr *tb[],
1898                                   struct list_head *hook_list)
1899 {
1900         struct nft_hook *hook;
1901         int err;
1902
1903         if (tb[NFTA_HOOK_DEV]) {
1904                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1905                 if (IS_ERR(hook))
1906                         return PTR_ERR(hook);
1907
1908                 list_add_tail(&hook->list, hook_list);
1909         } else if (tb[NFTA_HOOK_DEVS]) {
1910                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1911                                                    hook_list);
1912                 if (err < 0)
1913                         return err;
1914
1915                 if (list_empty(hook_list))
1916                         return -EINVAL;
1917         } else {
1918                 return -EINVAL;
1919         }
1920
1921         return 0;
1922 }
1923
1924 static int nft_chain_parse_hook(struct net *net,
1925                                 const struct nlattr * const nla[],
1926                                 struct nft_chain_hook *hook, u8 family,
1927                                 struct netlink_ext_ack *extack, bool autoload)
1928 {
1929         struct nftables_pernet *nft_net = nft_pernet(net);
1930         struct nlattr *ha[NFTA_HOOK_MAX + 1];
1931         const struct nft_chain_type *type;
1932         int err;
1933
1934         lockdep_assert_held(&nft_net->commit_mutex);
1935         lockdep_nfnl_nft_mutex_not_held();
1936
1937         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1938                                           nla[NFTA_CHAIN_HOOK],
1939                                           nft_hook_policy, NULL);
1940         if (err < 0)
1941                 return err;
1942
1943         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1944             ha[NFTA_HOOK_PRIORITY] == NULL)
1945                 return -EINVAL;
1946
1947         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1948         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1949
1950         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1951         if (!type)
1952                 return -EOPNOTSUPP;
1953
1954         if (nla[NFTA_CHAIN_TYPE]) {
1955                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1956                                                    family, autoload);
1957                 if (IS_ERR(type)) {
1958                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1959                         return PTR_ERR(type);
1960                 }
1961         }
1962         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1963                 return -EOPNOTSUPP;
1964
1965         if (type->type == NFT_CHAIN_T_NAT &&
1966             hook->priority <= NF_IP_PRI_CONNTRACK)
1967                 return -EOPNOTSUPP;
1968
1969         if (!try_module_get(type->owner)) {
1970                 if (nla[NFTA_CHAIN_TYPE])
1971                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1972                 return -ENOENT;
1973         }
1974
1975         hook->type = type;
1976
1977         INIT_LIST_HEAD(&hook->list);
1978         if (nft_base_chain_netdev(family, hook->num)) {
1979                 err = nft_chain_parse_netdev(net, ha, &hook->list);
1980                 if (err < 0) {
1981                         module_put(type->owner);
1982                         return err;
1983                 }
1984         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1985                 module_put(type->owner);
1986                 return -EOPNOTSUPP;
1987         }
1988
1989         return 0;
1990 }
1991
1992 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1993 {
1994         struct nft_hook *h, *next;
1995
1996         list_for_each_entry_safe(h, next, &hook->list, list) {
1997                 list_del(&h->list);
1998                 kfree(h);
1999         }
2000         module_put(hook->type->owner);
2001 }
2002
2003 struct nft_rules_old {
2004         struct rcu_head h;
2005         struct nft_rule **start;
2006 };
2007
2008 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2009                                                      unsigned int alloc)
2010 {
2011         if (alloc > INT_MAX)
2012                 return NULL;
2013
2014         alloc += 1;     /* NULL, ends rules */
2015         if (sizeof(struct nft_rule *) > INT_MAX / alloc)
2016                 return NULL;
2017
2018         alloc *= sizeof(struct nft_rule *);
2019         alloc += sizeof(struct nft_rules_old);
2020
2021         return kvmalloc(alloc, GFP_KERNEL);
2022 }
2023
2024 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2025                                     const struct nft_chain_hook *hook,
2026                                     struct nft_chain *chain)
2027 {
2028         ops->pf                 = family;
2029         ops->hooknum            = hook->num;
2030         ops->priority           = hook->priority;
2031         ops->priv               = chain;
2032         ops->hook               = hook->type->hooks[ops->hooknum];
2033         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2034 }
2035
2036 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2037                               struct nft_chain_hook *hook, u32 flags)
2038 {
2039         struct nft_chain *chain;
2040         struct nft_hook *h;
2041
2042         basechain->type = hook->type;
2043         INIT_LIST_HEAD(&basechain->hook_list);
2044         chain = &basechain->chain;
2045
2046         if (nft_base_chain_netdev(family, hook->num)) {
2047                 list_splice_init(&hook->list, &basechain->hook_list);
2048                 list_for_each_entry(h, &basechain->hook_list, list)
2049                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2050
2051                 basechain->ops.hooknum  = hook->num;
2052                 basechain->ops.priority = hook->priority;
2053         } else {
2054                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2055         }
2056
2057         chain->flags |= NFT_CHAIN_BASE | flags;
2058         basechain->policy = NF_ACCEPT;
2059         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2060             nft_chain_offload_priority(basechain) < 0)
2061                 return -EOPNOTSUPP;
2062
2063         flow_block_init(&basechain->flow_block);
2064
2065         return 0;
2066 }
2067
2068 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2069 {
2070         int err;
2071
2072         err = rhltable_insert_key(&table->chains_ht, chain->name,
2073                                   &chain->rhlhead, nft_chain_ht_params);
2074         if (err)
2075                 return err;
2076
2077         list_add_tail_rcu(&chain->list, &table->chains);
2078
2079         return 0;
2080 }
2081
2082 static u64 chain_id;
2083
2084 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2085                               u8 policy, u32 flags,
2086                               struct netlink_ext_ack *extack)
2087 {
2088         const struct nlattr * const *nla = ctx->nla;
2089         struct nft_table *table = ctx->table;
2090         struct nft_base_chain *basechain;
2091         struct nft_stats __percpu *stats;
2092         struct net *net = ctx->net;
2093         char name[NFT_NAME_MAXLEN];
2094         struct nft_trans *trans;
2095         struct nft_chain *chain;
2096         struct nft_rule **rules;
2097         int err;
2098
2099         if (table->use == UINT_MAX)
2100                 return -EOVERFLOW;
2101
2102         if (nla[NFTA_CHAIN_HOOK]) {
2103                 struct nft_chain_hook hook;
2104
2105                 if (flags & NFT_CHAIN_BINDING)
2106                         return -EOPNOTSUPP;
2107
2108                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2109                                            true);
2110                 if (err < 0)
2111                         return err;
2112
2113                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2114                 if (basechain == NULL) {
2115                         nft_chain_release_hook(&hook);
2116                         return -ENOMEM;
2117                 }
2118                 chain = &basechain->chain;
2119
2120                 if (nla[NFTA_CHAIN_COUNTERS]) {
2121                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2122                         if (IS_ERR(stats)) {
2123                                 nft_chain_release_hook(&hook);
2124                                 kfree(basechain);
2125                                 return PTR_ERR(stats);
2126                         }
2127                         rcu_assign_pointer(basechain->stats, stats);
2128                         static_branch_inc(&nft_counters_enabled);
2129                 }
2130
2131                 err = nft_basechain_init(basechain, family, &hook, flags);
2132                 if (err < 0) {
2133                         nft_chain_release_hook(&hook);
2134                         kfree(basechain);
2135                         return err;
2136                 }
2137         } else {
2138                 if (flags & NFT_CHAIN_BASE)
2139                         return -EINVAL;
2140                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2141                         return -EOPNOTSUPP;
2142
2143                 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2144                 if (chain == NULL)
2145                         return -ENOMEM;
2146
2147                 chain->flags = flags;
2148         }
2149         ctx->chain = chain;
2150
2151         INIT_LIST_HEAD(&chain->rules);
2152         chain->handle = nf_tables_alloc_handle(table);
2153         chain->table = table;
2154
2155         if (nla[NFTA_CHAIN_NAME]) {
2156                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2157         } else {
2158                 if (!(flags & NFT_CHAIN_BINDING)) {
2159                         err = -EINVAL;
2160                         goto err_destroy_chain;
2161                 }
2162
2163                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2164                 chain->name = kstrdup(name, GFP_KERNEL);
2165         }
2166
2167         if (!chain->name) {
2168                 err = -ENOMEM;
2169                 goto err_destroy_chain;
2170         }
2171
2172         if (nla[NFTA_CHAIN_USERDATA]) {
2173                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2174                 if (chain->udata == NULL) {
2175                         err = -ENOMEM;
2176                         goto err_destroy_chain;
2177                 }
2178                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2179         }
2180
2181         rules = nf_tables_chain_alloc_rules(chain, 0);
2182         if (!rules) {
2183                 err = -ENOMEM;
2184                 goto err_destroy_chain;
2185         }
2186
2187         *rules = NULL;
2188         rcu_assign_pointer(chain->rules_gen_0, rules);
2189         rcu_assign_pointer(chain->rules_gen_1, rules);
2190
2191         err = nf_tables_register_hook(net, table, chain);
2192         if (err < 0)
2193                 goto err_destroy_chain;
2194
2195         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2196         if (IS_ERR(trans)) {
2197                 err = PTR_ERR(trans);
2198                 goto err_unregister_hook;
2199         }
2200
2201         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2202         if (nft_is_base_chain(chain))
2203                 nft_trans_chain_policy(trans) = policy;
2204
2205         err = nft_chain_add(table, chain);
2206         if (err < 0) {
2207                 nft_trans_destroy(trans);
2208                 goto err_unregister_hook;
2209         }
2210
2211         table->use++;
2212
2213         return 0;
2214 err_unregister_hook:
2215         nf_tables_unregister_hook(net, table, chain);
2216 err_destroy_chain:
2217         nf_tables_chain_destroy(ctx);
2218
2219         return err;
2220 }
2221
2222 static bool nft_hook_list_equal(struct list_head *hook_list1,
2223                                 struct list_head *hook_list2)
2224 {
2225         struct nft_hook *hook;
2226         int n = 0, m = 0;
2227
2228         n = 0;
2229         list_for_each_entry(hook, hook_list2, list) {
2230                 if (!nft_hook_list_find(hook_list1, hook))
2231                         return false;
2232
2233                 n++;
2234         }
2235         list_for_each_entry(hook, hook_list1, list)
2236                 m++;
2237
2238         return n == m;
2239 }
2240
2241 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2242                               u32 flags, const struct nlattr *attr,
2243                               struct netlink_ext_ack *extack)
2244 {
2245         const struct nlattr * const *nla = ctx->nla;
2246         struct nft_table *table = ctx->table;
2247         struct nft_chain *chain = ctx->chain;
2248         struct nft_base_chain *basechain;
2249         struct nft_stats *stats = NULL;
2250         struct nft_chain_hook hook;
2251         struct nf_hook_ops *ops;
2252         struct nft_trans *trans;
2253         int err;
2254
2255         if (chain->flags ^ flags)
2256                 return -EOPNOTSUPP;
2257
2258         if (nla[NFTA_CHAIN_HOOK]) {
2259                 if (!nft_is_base_chain(chain)) {
2260                         NL_SET_BAD_ATTR(extack, attr);
2261                         return -EEXIST;
2262                 }
2263                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2264                                            extack, false);
2265                 if (err < 0)
2266                         return err;
2267
2268                 basechain = nft_base_chain(chain);
2269                 if (basechain->type != hook.type) {
2270                         nft_chain_release_hook(&hook);
2271                         NL_SET_BAD_ATTR(extack, attr);
2272                         return -EEXIST;
2273                 }
2274
2275                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2276                         if (!nft_hook_list_equal(&basechain->hook_list,
2277                                                  &hook.list)) {
2278                                 nft_chain_release_hook(&hook);
2279                                 NL_SET_BAD_ATTR(extack, attr);
2280                                 return -EEXIST;
2281                         }
2282                 } else {
2283                         ops = &basechain->ops;
2284                         if (ops->hooknum != hook.num ||
2285                             ops->priority != hook.priority) {
2286                                 nft_chain_release_hook(&hook);
2287                                 NL_SET_BAD_ATTR(extack, attr);
2288                                 return -EEXIST;
2289                         }
2290                 }
2291                 nft_chain_release_hook(&hook);
2292         }
2293
2294         if (nla[NFTA_CHAIN_HANDLE] &&
2295             nla[NFTA_CHAIN_NAME]) {
2296                 struct nft_chain *chain2;
2297
2298                 chain2 = nft_chain_lookup(ctx->net, table,
2299                                           nla[NFTA_CHAIN_NAME], genmask);
2300                 if (!IS_ERR(chain2)) {
2301                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2302                         return -EEXIST;
2303                 }
2304         }
2305
2306         if (nla[NFTA_CHAIN_COUNTERS]) {
2307                 if (!nft_is_base_chain(chain))
2308                         return -EOPNOTSUPP;
2309
2310                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2311                 if (IS_ERR(stats))
2312                         return PTR_ERR(stats);
2313         }
2314
2315         err = -ENOMEM;
2316         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2317                                 sizeof(struct nft_trans_chain));
2318         if (trans == NULL)
2319                 goto err;
2320
2321         nft_trans_chain_stats(trans) = stats;
2322         nft_trans_chain_update(trans) = true;
2323
2324         if (nla[NFTA_CHAIN_POLICY])
2325                 nft_trans_chain_policy(trans) = policy;
2326         else
2327                 nft_trans_chain_policy(trans) = -1;
2328
2329         if (nla[NFTA_CHAIN_HANDLE] &&
2330             nla[NFTA_CHAIN_NAME]) {
2331                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2332                 struct nft_trans *tmp;
2333                 char *name;
2334
2335                 err = -ENOMEM;
2336                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2337                 if (!name)
2338                         goto err;
2339
2340                 err = -EEXIST;
2341                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2342                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2343                             tmp->ctx.table == table &&
2344                             nft_trans_chain_update(tmp) &&
2345                             nft_trans_chain_name(tmp) &&
2346                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2347                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2348                                 kfree(name);
2349                                 goto err;
2350                         }
2351                 }
2352
2353                 nft_trans_chain_name(trans) = name;
2354         }
2355         nft_trans_commit_list_add_tail(ctx->net, trans);
2356
2357         return 0;
2358 err:
2359         free_percpu(stats);
2360         kfree(trans);
2361         return err;
2362 }
2363
2364 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2365                                                const struct nlattr *nla)
2366 {
2367         struct nftables_pernet *nft_net = nft_pernet(net);
2368         u32 id = ntohl(nla_get_be32(nla));
2369         struct nft_trans *trans;
2370
2371         list_for_each_entry(trans, &nft_net->commit_list, list) {
2372                 struct nft_chain *chain = trans->ctx.chain;
2373
2374                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2375                     id == nft_trans_chain_id(trans))
2376                         return chain;
2377         }
2378         return ERR_PTR(-ENOENT);
2379 }
2380
2381 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2382                               const struct nlattr * const nla[])
2383 {
2384         struct nftables_pernet *nft_net = nft_pernet(info->net);
2385         struct netlink_ext_ack *extack = info->extack;
2386         u8 genmask = nft_genmask_next(info->net);
2387         u8 family = info->nfmsg->nfgen_family;
2388         struct nft_chain *chain = NULL;
2389         struct net *net = info->net;
2390         const struct nlattr *attr;
2391         struct nft_table *table;
2392         u8 policy = NF_ACCEPT;
2393         struct nft_ctx ctx;
2394         u64 handle = 0;
2395         u32 flags = 0;
2396
2397         lockdep_assert_held(&nft_net->commit_mutex);
2398
2399         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2400                                  NETLINK_CB(skb).portid);
2401         if (IS_ERR(table)) {
2402                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2403                 return PTR_ERR(table);
2404         }
2405
2406         chain = NULL;
2407         attr = nla[NFTA_CHAIN_NAME];
2408
2409         if (nla[NFTA_CHAIN_HANDLE]) {
2410                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2411                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2412                 if (IS_ERR(chain)) {
2413                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2414                         return PTR_ERR(chain);
2415                 }
2416                 attr = nla[NFTA_CHAIN_HANDLE];
2417         } else if (nla[NFTA_CHAIN_NAME]) {
2418                 chain = nft_chain_lookup(net, table, attr, genmask);
2419                 if (IS_ERR(chain)) {
2420                         if (PTR_ERR(chain) != -ENOENT) {
2421                                 NL_SET_BAD_ATTR(extack, attr);
2422                                 return PTR_ERR(chain);
2423                         }
2424                         chain = NULL;
2425                 }
2426         } else if (!nla[NFTA_CHAIN_ID]) {
2427                 return -EINVAL;
2428         }
2429
2430         if (nla[NFTA_CHAIN_POLICY]) {
2431                 if (chain != NULL &&
2432                     !nft_is_base_chain(chain)) {
2433                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2434                         return -EOPNOTSUPP;
2435                 }
2436
2437                 if (chain == NULL &&
2438                     nla[NFTA_CHAIN_HOOK] == NULL) {
2439                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2440                         return -EOPNOTSUPP;
2441                 }
2442
2443                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2444                 switch (policy) {
2445                 case NF_DROP:
2446                 case NF_ACCEPT:
2447                         break;
2448                 default:
2449                         return -EINVAL;
2450                 }
2451         }
2452
2453         if (nla[NFTA_CHAIN_FLAGS])
2454                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2455         else if (chain)
2456                 flags = chain->flags;
2457
2458         if (flags & ~NFT_CHAIN_FLAGS)
2459                 return -EOPNOTSUPP;
2460
2461         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2462
2463         if (chain != NULL) {
2464                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2465                         NL_SET_BAD_ATTR(extack, attr);
2466                         return -EEXIST;
2467                 }
2468                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2469                         return -EOPNOTSUPP;
2470
2471                 flags |= chain->flags & NFT_CHAIN_BASE;
2472                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2473                                           extack);
2474         }
2475
2476         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2477 }
2478
2479 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2480                               const struct nlattr * const nla[])
2481 {
2482         struct netlink_ext_ack *extack = info->extack;
2483         u8 genmask = nft_genmask_next(info->net);
2484         u8 family = info->nfmsg->nfgen_family;
2485         struct net *net = info->net;
2486         const struct nlattr *attr;
2487         struct nft_table *table;
2488         struct nft_chain *chain;
2489         struct nft_rule *rule;
2490         struct nft_ctx ctx;
2491         u64 handle;
2492         u32 use;
2493         int err;
2494
2495         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2496                                  NETLINK_CB(skb).portid);
2497         if (IS_ERR(table)) {
2498                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2499                 return PTR_ERR(table);
2500         }
2501
2502         if (nla[NFTA_CHAIN_HANDLE]) {
2503                 attr = nla[NFTA_CHAIN_HANDLE];
2504                 handle = be64_to_cpu(nla_get_be64(attr));
2505                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2506         } else {
2507                 attr = nla[NFTA_CHAIN_NAME];
2508                 chain = nft_chain_lookup(net, table, attr, genmask);
2509         }
2510         if (IS_ERR(chain)) {
2511                 NL_SET_BAD_ATTR(extack, attr);
2512                 return PTR_ERR(chain);
2513         }
2514
2515         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2516             chain->use > 0)
2517                 return -EBUSY;
2518
2519         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2520
2521         use = chain->use;
2522         list_for_each_entry(rule, &chain->rules, list) {
2523                 if (!nft_is_active_next(net, rule))
2524                         continue;
2525                 use--;
2526
2527                 err = nft_delrule(&ctx, rule);
2528                 if (err < 0)
2529                         return err;
2530         }
2531
2532         /* There are rules and elements that are still holding references to us,
2533          * we cannot do a recursive removal in this case.
2534          */
2535         if (use > 0) {
2536                 NL_SET_BAD_ATTR(extack, attr);
2537                 return -EBUSY;
2538         }
2539
2540         return nft_delchain(&ctx);
2541 }
2542
2543 /*
2544  * Expressions
2545  */
2546
2547 /**
2548  *      nft_register_expr - register nf_tables expr type
2549  *      @type: expr type
2550  *
2551  *      Registers the expr type for use with nf_tables. Returns zero on
2552  *      success or a negative errno code otherwise.
2553  */
2554 int nft_register_expr(struct nft_expr_type *type)
2555 {
2556         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2557         if (type->family == NFPROTO_UNSPEC)
2558                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2559         else
2560                 list_add_rcu(&type->list, &nf_tables_expressions);
2561         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2562         return 0;
2563 }
2564 EXPORT_SYMBOL_GPL(nft_register_expr);
2565
2566 /**
2567  *      nft_unregister_expr - unregister nf_tables expr type
2568  *      @type: expr type
2569  *
2570  *      Unregisters the expr typefor use with nf_tables.
2571  */
2572 void nft_unregister_expr(struct nft_expr_type *type)
2573 {
2574         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2575         list_del_rcu(&type->list);
2576         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2577 }
2578 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2579
2580 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2581                                                        struct nlattr *nla)
2582 {
2583         const struct nft_expr_type *type, *candidate = NULL;
2584
2585         list_for_each_entry(type, &nf_tables_expressions, list) {
2586                 if (!nla_strcmp(nla, type->name)) {
2587                         if (!type->family && !candidate)
2588                                 candidate = type;
2589                         else if (type->family == family)
2590                                 candidate = type;
2591                 }
2592         }
2593         return candidate;
2594 }
2595
2596 #ifdef CONFIG_MODULES
2597 static int nft_expr_type_request_module(struct net *net, u8 family,
2598                                         struct nlattr *nla)
2599 {
2600         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2601                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2602                 return -EAGAIN;
2603
2604         return 0;
2605 }
2606 #endif
2607
2608 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2609                                                      u8 family,
2610                                                      struct nlattr *nla)
2611 {
2612         const struct nft_expr_type *type;
2613
2614         if (nla == NULL)
2615                 return ERR_PTR(-EINVAL);
2616
2617         type = __nft_expr_type_get(family, nla);
2618         if (type != NULL && try_module_get(type->owner))
2619                 return type;
2620
2621         lockdep_nfnl_nft_mutex_not_held();
2622 #ifdef CONFIG_MODULES
2623         if (type == NULL) {
2624                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2625                         return ERR_PTR(-EAGAIN);
2626
2627                 if (nft_request_module(net, "nft-expr-%.*s",
2628                                        nla_len(nla),
2629                                        (char *)nla_data(nla)) == -EAGAIN)
2630                         return ERR_PTR(-EAGAIN);
2631         }
2632 #endif
2633         return ERR_PTR(-ENOENT);
2634 }
2635
2636 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2637         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2638                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2639         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2640 };
2641
2642 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2643                                     const struct nft_expr *expr)
2644 {
2645         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2646                 goto nla_put_failure;
2647
2648         if (expr->ops->dump) {
2649                 struct nlattr *data = nla_nest_start_noflag(skb,
2650                                                             NFTA_EXPR_DATA);
2651                 if (data == NULL)
2652                         goto nla_put_failure;
2653                 if (expr->ops->dump(skb, expr) < 0)
2654                         goto nla_put_failure;
2655                 nla_nest_end(skb, data);
2656         }
2657
2658         return skb->len;
2659
2660 nla_put_failure:
2661         return -1;
2662 };
2663
2664 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2665                   const struct nft_expr *expr)
2666 {
2667         struct nlattr *nest;
2668
2669         nest = nla_nest_start_noflag(skb, attr);
2670         if (!nest)
2671                 goto nla_put_failure;
2672         if (nf_tables_fill_expr_info(skb, expr) < 0)
2673                 goto nla_put_failure;
2674         nla_nest_end(skb, nest);
2675         return 0;
2676
2677 nla_put_failure:
2678         return -1;
2679 }
2680
2681 struct nft_expr_info {
2682         const struct nft_expr_ops       *ops;
2683         const struct nlattr             *attr;
2684         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2685 };
2686
2687 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2688                                 const struct nlattr *nla,
2689                                 struct nft_expr_info *info)
2690 {
2691         const struct nft_expr_type *type;
2692         const struct nft_expr_ops *ops;
2693         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2694         int err;
2695
2696         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2697                                           nft_expr_policy, NULL);
2698         if (err < 0)
2699                 return err;
2700
2701         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2702         if (IS_ERR(type))
2703                 return PTR_ERR(type);
2704
2705         if (tb[NFTA_EXPR_DATA]) {
2706                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2707                                                   tb[NFTA_EXPR_DATA],
2708                                                   type->policy, NULL);
2709                 if (err < 0)
2710                         goto err1;
2711         } else
2712                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2713
2714         if (type->select_ops != NULL) {
2715                 ops = type->select_ops(ctx,
2716                                        (const struct nlattr * const *)info->tb);
2717                 if (IS_ERR(ops)) {
2718                         err = PTR_ERR(ops);
2719 #ifdef CONFIG_MODULES
2720                         if (err == -EAGAIN)
2721                                 if (nft_expr_type_request_module(ctx->net,
2722                                                                  ctx->family,
2723                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2724                                         err = -ENOENT;
2725 #endif
2726                         goto err1;
2727                 }
2728         } else
2729                 ops = type->ops;
2730
2731         info->attr = nla;
2732         info->ops = ops;
2733
2734         return 0;
2735
2736 err1:
2737         module_put(type->owner);
2738         return err;
2739 }
2740
2741 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2742                              const struct nft_expr_info *expr_info,
2743                              struct nft_expr *expr)
2744 {
2745         const struct nft_expr_ops *ops = expr_info->ops;
2746         int err;
2747
2748         expr->ops = ops;
2749         if (ops->init) {
2750                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2751                 if (err < 0)
2752                         goto err1;
2753         }
2754
2755         return 0;
2756 err1:
2757         expr->ops = NULL;
2758         return err;
2759 }
2760
2761 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2762                                    struct nft_expr *expr)
2763 {
2764         const struct nft_expr_type *type = expr->ops->type;
2765
2766         if (expr->ops->destroy)
2767                 expr->ops->destroy(ctx, expr);
2768         module_put(type->owner);
2769 }
2770
2771 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2772                                       const struct nlattr *nla)
2773 {
2774         struct nft_expr_info expr_info;
2775         struct nft_expr *expr;
2776         struct module *owner;
2777         int err;
2778
2779         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2780         if (err < 0)
2781                 goto err1;
2782
2783         err = -ENOMEM;
2784         expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2785         if (expr == NULL)
2786                 goto err2;
2787
2788         err = nf_tables_newexpr(ctx, &expr_info, expr);
2789         if (err < 0)
2790                 goto err3;
2791
2792         return expr;
2793 err3:
2794         kfree(expr);
2795 err2:
2796         owner = expr_info.ops->type->owner;
2797         if (expr_info.ops->type->release_ops)
2798                 expr_info.ops->type->release_ops(expr_info.ops);
2799
2800         module_put(owner);
2801 err1:
2802         return ERR_PTR(err);
2803 }
2804
2805 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2806 {
2807         int err;
2808
2809         if (src->ops->clone) {
2810                 dst->ops = src->ops;
2811                 err = src->ops->clone(dst, src);
2812                 if (err < 0)
2813                         return err;
2814         } else {
2815                 memcpy(dst, src, src->ops->size);
2816         }
2817
2818         __module_get(src->ops->type->owner);
2819
2820         return 0;
2821 }
2822
2823 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2824 {
2825         nf_tables_expr_destroy(ctx, expr);
2826         kfree(expr);
2827 }
2828
2829 /*
2830  * Rules
2831  */
2832
2833 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2834                                           u64 handle)
2835 {
2836         struct nft_rule *rule;
2837
2838         // FIXME: this sucks
2839         list_for_each_entry_rcu(rule, &chain->rules, list) {
2840                 if (handle == rule->handle)
2841                         return rule;
2842         }
2843
2844         return ERR_PTR(-ENOENT);
2845 }
2846
2847 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2848                                         const struct nlattr *nla)
2849 {
2850         if (nla == NULL)
2851                 return ERR_PTR(-EINVAL);
2852
2853         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2854 }
2855
2856 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2857         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2858                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2859         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2860                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2861         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2862         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2863         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2864         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2865         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2866                                     .len = NFT_USERDATA_MAXLEN },
2867         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2868         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2869         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2870 };
2871
2872 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2873                                     u32 portid, u32 seq, int event,
2874                                     u32 flags, int family,
2875                                     const struct nft_table *table,
2876                                     const struct nft_chain *chain,
2877                                     const struct nft_rule *rule, u64 handle)
2878 {
2879         struct nlmsghdr *nlh;
2880         const struct nft_expr *expr, *next;
2881         struct nlattr *list;
2882         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2883
2884         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2885                            nft_base_seq(net));
2886         if (!nlh)
2887                 goto nla_put_failure;
2888
2889         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2890                 goto nla_put_failure;
2891         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2892                 goto nla_put_failure;
2893         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2894                          NFTA_RULE_PAD))
2895                 goto nla_put_failure;
2896
2897         if (event != NFT_MSG_DELRULE && handle) {
2898                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
2899                                  NFTA_RULE_PAD))
2900                         goto nla_put_failure;
2901         }
2902
2903         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2904                 nft_flow_rule_stats(chain, rule);
2905
2906         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2907         if (list == NULL)
2908                 goto nla_put_failure;
2909         nft_rule_for_each_expr(expr, next, rule) {
2910                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2911                         goto nla_put_failure;
2912         }
2913         nla_nest_end(skb, list);
2914
2915         if (rule->udata) {
2916                 struct nft_userdata *udata = nft_userdata(rule);
2917                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2918                             udata->data) < 0)
2919                         goto nla_put_failure;
2920         }
2921
2922         nlmsg_end(skb, nlh);
2923         return 0;
2924
2925 nla_put_failure:
2926         nlmsg_trim(skb, nlh);
2927         return -1;
2928 }
2929
2930 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2931                                   const struct nft_rule *rule, int event)
2932 {
2933         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2934         const struct nft_rule *prule;
2935         struct sk_buff *skb;
2936         u64 handle = 0;
2937         u16 flags = 0;
2938         int err;
2939
2940         if (!ctx->report &&
2941             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2942                 return;
2943
2944         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2945         if (skb == NULL)
2946                 goto err;
2947
2948         if (event == NFT_MSG_NEWRULE &&
2949             !list_is_first(&rule->list, &ctx->chain->rules) &&
2950             !list_is_last(&rule->list, &ctx->chain->rules)) {
2951                 prule = list_prev_entry(rule, list);
2952                 handle = prule->handle;
2953         }
2954         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
2955                 flags |= NLM_F_APPEND;
2956         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
2957                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
2958
2959         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2960                                        event, flags, ctx->family, ctx->table,
2961                                        ctx->chain, rule, handle);
2962         if (err < 0) {
2963                 kfree_skb(skb);
2964                 goto err;
2965         }
2966
2967         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
2968         return;
2969 err:
2970         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2971 }
2972
2973 struct nft_rule_dump_ctx {
2974         char *table;
2975         char *chain;
2976 };
2977
2978 static int __nf_tables_dump_rules(struct sk_buff *skb,
2979                                   unsigned int *idx,
2980                                   struct netlink_callback *cb,
2981                                   const struct nft_table *table,
2982                                   const struct nft_chain *chain)
2983 {
2984         struct net *net = sock_net(skb->sk);
2985         const struct nft_rule *rule, *prule;
2986         unsigned int s_idx = cb->args[0];
2987         u64 handle;
2988
2989         prule = NULL;
2990         list_for_each_entry_rcu(rule, &chain->rules, list) {
2991                 if (!nft_is_active(net, rule))
2992                         goto cont_skip;
2993                 if (*idx < s_idx)
2994                         goto cont;
2995                 if (*idx > s_idx) {
2996                         memset(&cb->args[1], 0,
2997                                         sizeof(cb->args) - sizeof(cb->args[0]));
2998                 }
2999                 if (prule)
3000                         handle = prule->handle;
3001                 else
3002                         handle = 0;
3003
3004                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3005                                         cb->nlh->nlmsg_seq,
3006                                         NFT_MSG_NEWRULE,
3007                                         NLM_F_MULTI | NLM_F_APPEND,
3008                                         table->family,
3009                                         table, chain, rule, handle) < 0)
3010                         return 1;
3011
3012                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3013 cont:
3014                 prule = rule;
3015 cont_skip:
3016                 (*idx)++;
3017         }
3018         return 0;
3019 }
3020
3021 static int nf_tables_dump_rules(struct sk_buff *skb,
3022                                 struct netlink_callback *cb)
3023 {
3024         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3025         const struct nft_rule_dump_ctx *ctx = cb->data;
3026         struct nft_table *table;
3027         const struct nft_chain *chain;
3028         unsigned int idx = 0;
3029         struct net *net = sock_net(skb->sk);
3030         int family = nfmsg->nfgen_family;
3031         struct nftables_pernet *nft_net;
3032
3033         rcu_read_lock();
3034         nft_net = nft_pernet(net);
3035         cb->seq = nft_net->base_seq;
3036
3037         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3038                 if (family != NFPROTO_UNSPEC && family != table->family)
3039                         continue;
3040
3041                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3042                         continue;
3043
3044                 if (ctx && ctx->table && ctx->chain) {
3045                         struct rhlist_head *list, *tmp;
3046
3047                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3048                                                nft_chain_ht_params);
3049                         if (!list)
3050                                 goto done;
3051
3052                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3053                                 if (!nft_is_active(net, chain))
3054                                         continue;
3055                                 __nf_tables_dump_rules(skb, &idx,
3056                                                        cb, table, chain);
3057                                 break;
3058                         }
3059                         goto done;
3060                 }
3061
3062                 list_for_each_entry_rcu(chain, &table->chains, list) {
3063                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3064                                 goto done;
3065                 }
3066
3067                 if (ctx && ctx->table)
3068                         break;
3069         }
3070 done:
3071         rcu_read_unlock();
3072
3073         cb->args[0] = idx;
3074         return skb->len;
3075 }
3076
3077 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3078 {
3079         const struct nlattr * const *nla = cb->data;
3080         struct nft_rule_dump_ctx *ctx = NULL;
3081
3082         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3083                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3084                 if (!ctx)
3085                         return -ENOMEM;
3086
3087                 if (nla[NFTA_RULE_TABLE]) {
3088                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3089                                                         GFP_ATOMIC);
3090                         if (!ctx->table) {
3091                                 kfree(ctx);
3092                                 return -ENOMEM;
3093                         }
3094                 }
3095                 if (nla[NFTA_RULE_CHAIN]) {
3096                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3097                                                 GFP_ATOMIC);
3098                         if (!ctx->chain) {
3099                                 kfree(ctx->table);
3100                                 kfree(ctx);
3101                                 return -ENOMEM;
3102                         }
3103                 }
3104         }
3105
3106         cb->data = ctx;
3107         return 0;
3108 }
3109
3110 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3111 {
3112         struct nft_rule_dump_ctx *ctx = cb->data;
3113
3114         if (ctx) {
3115                 kfree(ctx->table);
3116                 kfree(ctx->chain);
3117                 kfree(ctx);
3118         }
3119         return 0;
3120 }
3121
3122 /* called with rcu_read_lock held */
3123 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3124                              const struct nlattr * const nla[])
3125 {
3126         struct netlink_ext_ack *extack = info->extack;
3127         u8 genmask = nft_genmask_cur(info->net);
3128         u8 family = info->nfmsg->nfgen_family;
3129         const struct nft_chain *chain;
3130         const struct nft_rule *rule;
3131         struct net *net = info->net;
3132         struct nft_table *table;
3133         struct sk_buff *skb2;
3134         int err;
3135
3136         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3137                 struct netlink_dump_control c = {
3138                         .start= nf_tables_dump_rules_start,
3139                         .dump = nf_tables_dump_rules,
3140                         .done = nf_tables_dump_rules_done,
3141                         .module = THIS_MODULE,
3142                         .data = (void *)nla,
3143                 };
3144
3145                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3146         }
3147
3148         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3149         if (IS_ERR(table)) {
3150                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3151                 return PTR_ERR(table);
3152         }
3153
3154         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3155         if (IS_ERR(chain)) {
3156                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3157                 return PTR_ERR(chain);
3158         }
3159
3160         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3161         if (IS_ERR(rule)) {
3162                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3163                 return PTR_ERR(rule);
3164         }
3165
3166         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3167         if (!skb2)
3168                 return -ENOMEM;
3169
3170         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3171                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3172                                        family, table, chain, rule, 0);
3173         if (err < 0)
3174                 goto err_fill_rule_info;
3175
3176         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3177
3178 err_fill_rule_info:
3179         kfree_skb(skb2);
3180         return err;
3181 }
3182
3183 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3184                                    struct nft_rule *rule)
3185 {
3186         struct nft_expr *expr, *next;
3187
3188         /*
3189          * Careful: some expressions might not be initialized in case this
3190          * is called on error from nf_tables_newrule().
3191          */
3192         expr = nft_expr_first(rule);
3193         while (nft_expr_more(rule, expr)) {
3194                 next = nft_expr_next(expr);
3195                 nf_tables_expr_destroy(ctx, expr);
3196                 expr = next;
3197         }
3198         kfree(rule);
3199 }
3200
3201 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3202 {
3203         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3204         nf_tables_rule_destroy(ctx, rule);
3205 }
3206
3207 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3208 {
3209         struct nft_expr *expr, *last;
3210         const struct nft_data *data;
3211         struct nft_rule *rule;
3212         int err;
3213
3214         if (ctx->level == NFT_JUMP_STACK_SIZE)
3215                 return -EMLINK;
3216
3217         list_for_each_entry(rule, &chain->rules, list) {
3218                 if (!nft_is_active_next(ctx->net, rule))
3219                         continue;
3220
3221                 nft_rule_for_each_expr(expr, last, rule) {
3222                         if (!expr->ops->validate)
3223                                 continue;
3224
3225                         err = expr->ops->validate(ctx, expr, &data);
3226                         if (err < 0)
3227                                 return err;
3228                 }
3229         }
3230
3231         return 0;
3232 }
3233 EXPORT_SYMBOL_GPL(nft_chain_validate);
3234
3235 static int nft_table_validate(struct net *net, const struct nft_table *table)
3236 {
3237         struct nft_chain *chain;
3238         struct nft_ctx ctx = {
3239                 .net    = net,
3240                 .family = table->family,
3241         };
3242         int err;
3243
3244         list_for_each_entry(chain, &table->chains, list) {
3245                 if (!nft_is_base_chain(chain))
3246                         continue;
3247
3248                 ctx.chain = chain;
3249                 err = nft_chain_validate(&ctx, chain);
3250                 if (err < 0)
3251                         return err;
3252         }
3253
3254         return 0;
3255 }
3256
3257 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3258                                              const struct nlattr *nla);
3259
3260 #define NFT_RULE_MAXEXPRS       128
3261
3262 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3263                              const struct nlattr * const nla[])
3264 {
3265         struct nftables_pernet *nft_net = nft_pernet(info->net);
3266         struct netlink_ext_ack *extack = info->extack;
3267         unsigned int size, i, n, ulen = 0, usize = 0;
3268         u8 genmask = nft_genmask_next(info->net);
3269         struct nft_rule *rule, *old_rule = NULL;
3270         struct nft_expr_info *expr_info = NULL;
3271         u8 family = info->nfmsg->nfgen_family;
3272         struct nft_flow_rule *flow = NULL;
3273         struct net *net = info->net;
3274         struct nft_userdata *udata;
3275         struct nft_table *table;
3276         struct nft_chain *chain;
3277         struct nft_trans *trans;
3278         u64 handle, pos_handle;
3279         struct nft_expr *expr;
3280         struct nft_ctx ctx;
3281         struct nlattr *tmp;
3282         int err, rem;
3283
3284         lockdep_assert_held(&nft_net->commit_mutex);
3285
3286         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3287                                  NETLINK_CB(skb).portid);
3288         if (IS_ERR(table)) {
3289                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3290                 return PTR_ERR(table);
3291         }
3292
3293         if (nla[NFTA_RULE_CHAIN]) {
3294                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3295                                          genmask);
3296                 if (IS_ERR(chain)) {
3297                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3298                         return PTR_ERR(chain);
3299                 }
3300                 if (nft_chain_is_bound(chain))
3301                         return -EOPNOTSUPP;
3302
3303         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3304                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3305                 if (IS_ERR(chain)) {
3306                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3307                         return PTR_ERR(chain);
3308                 }
3309         } else {
3310                 return -EINVAL;
3311         }
3312
3313         if (nla[NFTA_RULE_HANDLE]) {
3314                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3315                 rule = __nft_rule_lookup(chain, handle);
3316                 if (IS_ERR(rule)) {
3317                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3318                         return PTR_ERR(rule);
3319                 }
3320
3321                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3322                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3323                         return -EEXIST;
3324                 }
3325                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3326                         old_rule = rule;
3327                 else
3328                         return -EOPNOTSUPP;
3329         } else {
3330                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3331                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3332                         return -EINVAL;
3333                 handle = nf_tables_alloc_handle(table);
3334
3335                 if (chain->use == UINT_MAX)
3336                         return -EOVERFLOW;
3337
3338                 if (nla[NFTA_RULE_POSITION]) {
3339                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3340                         old_rule = __nft_rule_lookup(chain, pos_handle);
3341                         if (IS_ERR(old_rule)) {
3342                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3343                                 return PTR_ERR(old_rule);
3344                         }
3345                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3346                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3347                         if (IS_ERR(old_rule)) {
3348                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3349                                 return PTR_ERR(old_rule);
3350                         }
3351                 }
3352         }
3353
3354         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3355
3356         n = 0;
3357         size = 0;
3358         if (nla[NFTA_RULE_EXPRESSIONS]) {
3359                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3360                                            sizeof(struct nft_expr_info),
3361                                            GFP_KERNEL);
3362                 if (!expr_info)
3363                         return -ENOMEM;
3364
3365                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3366                         err = -EINVAL;
3367                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3368                                 goto err_release_expr;
3369                         if (n == NFT_RULE_MAXEXPRS)
3370                                 goto err_release_expr;
3371                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3372                         if (err < 0) {
3373                                 NL_SET_BAD_ATTR(extack, tmp);
3374                                 goto err_release_expr;
3375                         }
3376                         size += expr_info[n].ops->size;
3377                         n++;
3378                 }
3379         }
3380         /* Check for overflow of dlen field */
3381         err = -EFBIG;
3382         if (size >= 1 << 12)
3383                 goto err_release_expr;
3384
3385         if (nla[NFTA_RULE_USERDATA]) {
3386                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3387                 if (ulen > 0)
3388                         usize = sizeof(struct nft_userdata) + ulen;
3389         }
3390
3391         err = -ENOMEM;
3392         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3393         if (rule == NULL)
3394                 goto err_release_expr;
3395
3396         nft_activate_next(net, rule);
3397
3398         rule->handle = handle;
3399         rule->dlen   = size;
3400         rule->udata  = ulen ? 1 : 0;
3401
3402         if (ulen) {
3403                 udata = nft_userdata(rule);
3404                 udata->len = ulen - 1;
3405                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3406         }
3407
3408         expr = nft_expr_first(rule);
3409         for (i = 0; i < n; i++) {
3410                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3411                 if (err < 0) {
3412                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3413                         goto err_release_rule;
3414                 }
3415
3416                 if (expr_info[i].ops->validate)
3417                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3418
3419                 expr_info[i].ops = NULL;
3420                 expr = nft_expr_next(expr);
3421         }
3422
3423         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3424                 flow = nft_flow_rule_create(net, rule);
3425                 if (IS_ERR(flow)) {
3426                         err = PTR_ERR(flow);
3427                         goto err_release_rule;
3428                 }
3429         }
3430
3431         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3432                 err = nft_delrule(&ctx, old_rule);
3433                 if (err < 0)
3434                         goto err_destroy_flow_rule;
3435
3436                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3437                 if (trans == NULL) {
3438                         err = -ENOMEM;
3439                         goto err_destroy_flow_rule;
3440                 }
3441                 list_add_tail_rcu(&rule->list, &old_rule->list);
3442         } else {
3443                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3444                 if (!trans) {
3445                         err = -ENOMEM;
3446                         goto err_destroy_flow_rule;
3447                 }
3448
3449                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3450                         if (old_rule)
3451                                 list_add_rcu(&rule->list, &old_rule->list);
3452                         else
3453                                 list_add_tail_rcu(&rule->list, &chain->rules);
3454                  } else {
3455                         if (old_rule)
3456                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3457                         else
3458                                 list_add_rcu(&rule->list, &chain->rules);
3459                 }
3460         }
3461         kvfree(expr_info);
3462         chain->use++;
3463
3464         if (flow)
3465                 nft_trans_flow_rule(trans) = flow;
3466
3467         if (nft_net->validate_state == NFT_VALIDATE_DO)
3468                 return nft_table_validate(net, table);
3469
3470         return 0;
3471
3472 err_destroy_flow_rule:
3473         if (flow)
3474                 nft_flow_rule_destroy(flow);
3475 err_release_rule:
3476         nf_tables_rule_release(&ctx, rule);
3477 err_release_expr:
3478         for (i = 0; i < n; i++) {
3479                 if (expr_info[i].ops) {
3480                         module_put(expr_info[i].ops->type->owner);
3481                         if (expr_info[i].ops->type->release_ops)
3482                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3483                 }
3484         }
3485         kvfree(expr_info);
3486
3487         return err;
3488 }
3489
3490 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3491                                              const struct nlattr *nla)
3492 {
3493         struct nftables_pernet *nft_net = nft_pernet(net);
3494         u32 id = ntohl(nla_get_be32(nla));
3495         struct nft_trans *trans;
3496
3497         list_for_each_entry(trans, &nft_net->commit_list, list) {
3498                 struct nft_rule *rule = nft_trans_rule(trans);
3499
3500                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3501                     id == nft_trans_rule_id(trans))
3502                         return rule;
3503         }
3504         return ERR_PTR(-ENOENT);
3505 }
3506
3507 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3508                              const struct nlattr * const nla[])
3509 {
3510         struct netlink_ext_ack *extack = info->extack;
3511         u8 genmask = nft_genmask_next(info->net);
3512         u8 family = info->nfmsg->nfgen_family;
3513         struct nft_chain *chain = NULL;
3514         struct net *net = info->net;
3515         struct nft_table *table;
3516         struct nft_rule *rule;
3517         struct nft_ctx ctx;
3518         int err = 0;
3519
3520         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3521                                  NETLINK_CB(skb).portid);
3522         if (IS_ERR(table)) {
3523                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3524                 return PTR_ERR(table);
3525         }
3526
3527         if (nla[NFTA_RULE_CHAIN]) {
3528                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3529                                          genmask);
3530                 if (IS_ERR(chain)) {
3531                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3532                         return PTR_ERR(chain);
3533                 }
3534                 if (nft_chain_is_bound(chain))
3535                         return -EOPNOTSUPP;
3536         }
3537
3538         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3539
3540         if (chain) {
3541                 if (nla[NFTA_RULE_HANDLE]) {
3542                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3543                         if (IS_ERR(rule)) {
3544                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3545                                 return PTR_ERR(rule);
3546                         }
3547
3548                         err = nft_delrule(&ctx, rule);
3549                 } else if (nla[NFTA_RULE_ID]) {
3550                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3551                         if (IS_ERR(rule)) {
3552                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3553                                 return PTR_ERR(rule);
3554                         }
3555
3556                         err = nft_delrule(&ctx, rule);
3557                 } else {
3558                         err = nft_delrule_by_chain(&ctx);
3559                 }
3560         } else {
3561                 list_for_each_entry(chain, &table->chains, list) {
3562                         if (!nft_is_active_next(net, chain))
3563                                 continue;
3564
3565                         ctx.chain = chain;
3566                         err = nft_delrule_by_chain(&ctx);
3567                         if (err < 0)
3568                                 break;
3569                 }
3570         }
3571
3572         return err;
3573 }
3574
3575 /*
3576  * Sets
3577  */
3578 static const struct nft_set_type *nft_set_types[] = {
3579         &nft_set_hash_fast_type,
3580         &nft_set_hash_type,
3581         &nft_set_rhash_type,
3582         &nft_set_bitmap_type,
3583         &nft_set_rbtree_type,
3584 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3585         &nft_set_pipapo_avx2_type,
3586 #endif
3587         &nft_set_pipapo_type,
3588 };
3589
3590 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3591                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3592                                  NFT_SET_EVAL)
3593
3594 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3595 {
3596         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3597 }
3598
3599 /*
3600  * Select a set implementation based on the data characteristics and the
3601  * given policy. The total memory use might not be known if no size is
3602  * given, in that case the amount of memory per element is used.
3603  */
3604 static const struct nft_set_ops *
3605 nft_select_set_ops(const struct nft_ctx *ctx,
3606                    const struct nlattr * const nla[],
3607                    const struct nft_set_desc *desc,
3608                    enum nft_set_policies policy)
3609 {
3610         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3611         const struct nft_set_ops *ops, *bops;
3612         struct nft_set_estimate est, best;
3613         const struct nft_set_type *type;
3614         u32 flags = 0;
3615         int i;
3616
3617         lockdep_assert_held(&nft_net->commit_mutex);
3618         lockdep_nfnl_nft_mutex_not_held();
3619
3620         if (nla[NFTA_SET_FLAGS] != NULL)
3621                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3622
3623         bops        = NULL;
3624         best.size   = ~0;
3625         best.lookup = ~0;
3626         best.space  = ~0;
3627
3628         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3629                 type = nft_set_types[i];
3630                 ops = &type->ops;
3631
3632                 if (!nft_set_ops_candidate(type, flags))
3633                         continue;
3634                 if (!ops->estimate(desc, flags, &est))
3635                         continue;
3636
3637                 switch (policy) {
3638                 case NFT_SET_POL_PERFORMANCE:
3639                         if (est.lookup < best.lookup)
3640                                 break;
3641                         if (est.lookup == best.lookup &&
3642                             est.space < best.space)
3643                                 break;
3644                         continue;
3645                 case NFT_SET_POL_MEMORY:
3646                         if (!desc->size) {
3647                                 if (est.space < best.space)
3648                                         break;
3649                                 if (est.space == best.space &&
3650                                     est.lookup < best.lookup)
3651                                         break;
3652                         } else if (est.size < best.size || !bops) {
3653                                 break;
3654                         }
3655                         continue;
3656                 default:
3657                         break;
3658                 }
3659
3660                 bops = ops;
3661                 best = est;
3662         }
3663
3664         if (bops != NULL)
3665                 return bops;
3666
3667         return ERR_PTR(-EOPNOTSUPP);
3668 }
3669
3670 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3671         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3672                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3673         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3674                                             .len = NFT_SET_MAXNAMELEN - 1 },
3675         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3676         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3677         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3678         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3679         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3680         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3681         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3682         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3683         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3684         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3685         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3686                                             .len  = NFT_USERDATA_MAXLEN },
3687         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3688         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3689         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3690         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3691 };
3692
3693 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3694         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3695         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3696 };
3697
3698 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3699                                       const struct nlattr *nla, u8 genmask)
3700 {
3701         struct nft_set *set;
3702
3703         if (nla == NULL)
3704                 return ERR_PTR(-EINVAL);
3705
3706         list_for_each_entry_rcu(set, &table->sets, list) {
3707                 if (!nla_strcmp(nla, set->name) &&
3708                     nft_active_genmask(set, genmask))
3709                         return set;
3710         }
3711         return ERR_PTR(-ENOENT);
3712 }
3713
3714 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3715                                                const struct nlattr *nla,
3716                                                u8 genmask)
3717 {
3718         struct nft_set *set;
3719
3720         list_for_each_entry(set, &table->sets, list) {
3721                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3722                     nft_active_genmask(set, genmask))
3723                         return set;
3724         }
3725         return ERR_PTR(-ENOENT);
3726 }
3727
3728 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3729                                            const struct nlattr *nla, u8 genmask)
3730 {
3731         struct nftables_pernet *nft_net = nft_pernet(net);
3732         u32 id = ntohl(nla_get_be32(nla));
3733         struct nft_trans *trans;
3734
3735         list_for_each_entry(trans, &nft_net->commit_list, list) {
3736                 if (trans->msg_type == NFT_MSG_NEWSET) {
3737                         struct nft_set *set = nft_trans_set(trans);
3738
3739                         if (id == nft_trans_set_id(trans) &&
3740                             nft_active_genmask(set, genmask))
3741                                 return set;
3742                 }
3743         }
3744         return ERR_PTR(-ENOENT);
3745 }
3746
3747 struct nft_set *nft_set_lookup_global(const struct net *net,
3748                                       const struct nft_table *table,
3749                                       const struct nlattr *nla_set_name,
3750                                       const struct nlattr *nla_set_id,
3751                                       u8 genmask)
3752 {
3753         struct nft_set *set;
3754
3755         set = nft_set_lookup(table, nla_set_name, genmask);
3756         if (IS_ERR(set)) {
3757                 if (!nla_set_id)
3758                         return set;
3759
3760                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3761         }
3762         return set;
3763 }
3764 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3765
3766 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3767                                     const char *name)
3768 {
3769         const struct nft_set *i;
3770         const char *p;
3771         unsigned long *inuse;
3772         unsigned int n = 0, min = 0;
3773
3774         p = strchr(name, '%');
3775         if (p != NULL) {
3776                 if (p[1] != 'd' || strchr(p + 2, '%'))
3777                         return -EINVAL;
3778
3779                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3780                 if (inuse == NULL)
3781                         return -ENOMEM;
3782 cont:
3783                 list_for_each_entry(i, &ctx->table->sets, list) {
3784                         int tmp;
3785
3786                         if (!nft_is_active_next(ctx->net, set))
3787                                 continue;
3788                         if (!sscanf(i->name, name, &tmp))
3789                                 continue;
3790                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3791                                 continue;
3792
3793                         set_bit(tmp - min, inuse);
3794                 }
3795
3796                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3797                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3798                         min += BITS_PER_BYTE * PAGE_SIZE;
3799                         memset(inuse, 0, PAGE_SIZE);
3800                         goto cont;
3801                 }
3802                 free_page((unsigned long)inuse);
3803         }
3804
3805         set->name = kasprintf(GFP_KERNEL, name, min + n);
3806         if (!set->name)
3807                 return -ENOMEM;
3808
3809         list_for_each_entry(i, &ctx->table->sets, list) {
3810                 if (!nft_is_active_next(ctx->net, i))
3811                         continue;
3812                 if (!strcmp(set->name, i->name)) {
3813                         kfree(set->name);
3814                         set->name = NULL;
3815                         return -ENFILE;
3816                 }
3817         }
3818         return 0;
3819 }
3820
3821 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3822 {
3823         u64 ms = be64_to_cpu(nla_get_be64(nla));
3824         u64 max = (u64)(~((u64)0));
3825
3826         max = div_u64(max, NSEC_PER_MSEC);
3827         if (ms >= max)
3828                 return -ERANGE;
3829
3830         ms *= NSEC_PER_MSEC;
3831         *result = nsecs_to_jiffies64(ms);
3832         return 0;
3833 }
3834
3835 __be64 nf_jiffies64_to_msecs(u64 input)
3836 {
3837         return cpu_to_be64(jiffies64_to_msecs(input));
3838 }
3839
3840 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3841                                      const struct nft_set *set)
3842 {
3843         struct nlattr *concat, *field;
3844         int i;
3845
3846         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3847         if (!concat)
3848                 return -ENOMEM;
3849
3850         for (i = 0; i < set->field_count; i++) {
3851                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3852                 if (!field)
3853                         return -ENOMEM;
3854
3855                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3856                                  htonl(set->field_len[i])))
3857                         return -ENOMEM;
3858
3859                 nla_nest_end(skb, field);
3860         }
3861
3862         nla_nest_end(skb, concat);
3863
3864         return 0;
3865 }
3866
3867 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3868                               const struct nft_set *set, u16 event, u16 flags)
3869 {
3870         struct nlmsghdr *nlh;
3871         u32 portid = ctx->portid;
3872         struct nlattr *nest;
3873         u32 seq = ctx->seq;
3874         int i;
3875
3876         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3877         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3878                            NFNETLINK_V0, nft_base_seq(ctx->net));
3879         if (!nlh)
3880                 goto nla_put_failure;
3881
3882         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3883                 goto nla_put_failure;
3884         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3885                 goto nla_put_failure;
3886         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3887                          NFTA_SET_PAD))
3888                 goto nla_put_failure;
3889         if (set->flags != 0)
3890                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3891                         goto nla_put_failure;
3892
3893         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3894                 goto nla_put_failure;
3895         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3896                 goto nla_put_failure;
3897         if (set->flags & NFT_SET_MAP) {
3898                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3899                         goto nla_put_failure;
3900                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3901                         goto nla_put_failure;
3902         }
3903         if (set->flags & NFT_SET_OBJECT &&
3904             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3905                 goto nla_put_failure;
3906
3907         if (set->timeout &&
3908             nla_put_be64(skb, NFTA_SET_TIMEOUT,
3909                          nf_jiffies64_to_msecs(set->timeout),
3910                          NFTA_SET_PAD))
3911                 goto nla_put_failure;
3912         if (set->gc_int &&
3913             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3914                 goto nla_put_failure;
3915
3916         if (set->policy != NFT_SET_POL_PERFORMANCE) {
3917                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3918                         goto nla_put_failure;
3919         }
3920
3921         if (set->udata &&
3922             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3923                 goto nla_put_failure;
3924
3925         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3926         if (!nest)
3927                 goto nla_put_failure;
3928         if (set->size &&
3929             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3930                 goto nla_put_failure;
3931
3932         if (set->field_count > 1 &&
3933             nf_tables_fill_set_concat(skb, set))
3934                 goto nla_put_failure;
3935
3936         nla_nest_end(skb, nest);
3937
3938         if (set->num_exprs == 1) {
3939                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3940                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3941                         goto nla_put_failure;
3942
3943                 nla_nest_end(skb, nest);
3944         } else if (set->num_exprs > 1) {
3945                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3946                 if (nest == NULL)
3947                         goto nla_put_failure;
3948
3949                 for (i = 0; i < set->num_exprs; i++) {
3950                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3951                                           set->exprs[i]) < 0)
3952                                 goto nla_put_failure;
3953                 }
3954                 nla_nest_end(skb, nest);
3955         }
3956
3957         nlmsg_end(skb, nlh);
3958         return 0;
3959
3960 nla_put_failure:
3961         nlmsg_trim(skb, nlh);
3962         return -1;
3963 }
3964
3965 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3966                                  const struct nft_set *set, int event,
3967                                  gfp_t gfp_flags)
3968 {
3969         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3970         u32 portid = ctx->portid;
3971         struct sk_buff *skb;
3972         u16 flags = 0;
3973         int err;
3974
3975         if (!ctx->report &&
3976             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3977                 return;
3978
3979         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3980         if (skb == NULL)
3981                 goto err;
3982
3983         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3984                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3985
3986         err = nf_tables_fill_set(skb, ctx, set, event, flags);
3987         if (err < 0) {
3988                 kfree_skb(skb);
3989                 goto err;
3990         }
3991
3992         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3993         return;
3994 err:
3995         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3996 }
3997
3998 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3999 {
4000         const struct nft_set *set;
4001         unsigned int idx, s_idx = cb->args[0];
4002         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4003         struct net *net = sock_net(skb->sk);
4004         struct nft_ctx *ctx = cb->data, ctx_set;
4005         struct nftables_pernet *nft_net;
4006
4007         if (cb->args[1])
4008                 return skb->len;
4009
4010         rcu_read_lock();
4011         nft_net = nft_pernet(net);
4012         cb->seq = nft_net->base_seq;
4013
4014         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4015                 if (ctx->family != NFPROTO_UNSPEC &&
4016                     ctx->family != table->family)
4017                         continue;
4018
4019                 if (ctx->table && ctx->table != table)
4020                         continue;
4021
4022                 if (cur_table) {
4023                         if (cur_table != table)
4024                                 continue;
4025
4026                         cur_table = NULL;
4027                 }
4028                 idx = 0;
4029                 list_for_each_entry_rcu(set, &table->sets, list) {
4030                         if (idx < s_idx)
4031                                 goto cont;
4032                         if (!nft_is_active(net, set))
4033                                 goto cont;
4034
4035                         ctx_set = *ctx;
4036                         ctx_set.table = table;
4037                         ctx_set.family = table->family;
4038
4039                         if (nf_tables_fill_set(skb, &ctx_set, set,
4040                                                NFT_MSG_NEWSET,
4041                                                NLM_F_MULTI) < 0) {
4042                                 cb->args[0] = idx;
4043                                 cb->args[2] = (unsigned long) table;
4044                                 goto done;
4045                         }
4046                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4047 cont:
4048                         idx++;
4049                 }
4050                 if (s_idx)
4051                         s_idx = 0;
4052         }
4053         cb->args[1] = 1;
4054 done:
4055         rcu_read_unlock();
4056         return skb->len;
4057 }
4058
4059 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4060 {
4061         struct nft_ctx *ctx_dump = NULL;
4062
4063         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4064         if (ctx_dump == NULL)
4065                 return -ENOMEM;
4066
4067         cb->data = ctx_dump;
4068         return 0;
4069 }
4070
4071 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4072 {
4073         kfree(cb->data);
4074         return 0;
4075 }
4076
4077 /* called with rcu_read_lock held */
4078 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4079                             const struct nlattr * const nla[])
4080 {
4081         struct netlink_ext_ack *extack = info->extack;
4082         u8 genmask = nft_genmask_cur(info->net);
4083         u8 family = info->nfmsg->nfgen_family;
4084         struct nft_table *table = NULL;
4085         struct net *net = info->net;
4086         const struct nft_set *set;
4087         struct sk_buff *skb2;
4088         struct nft_ctx ctx;
4089         int err;
4090
4091         if (nla[NFTA_SET_TABLE]) {
4092                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4093                                          genmask, 0);
4094                 if (IS_ERR(table)) {
4095                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4096                         return PTR_ERR(table);
4097                 }
4098         }
4099
4100         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4101
4102         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4103                 struct netlink_dump_control c = {
4104                         .start = nf_tables_dump_sets_start,
4105                         .dump = nf_tables_dump_sets,
4106                         .done = nf_tables_dump_sets_done,
4107                         .data = &ctx,
4108                         .module = THIS_MODULE,
4109                 };
4110
4111                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4112         }
4113
4114         /* Only accept unspec with dump */
4115         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4116                 return -EAFNOSUPPORT;
4117         if (!nla[NFTA_SET_TABLE])
4118                 return -EINVAL;
4119
4120         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4121         if (IS_ERR(set))
4122                 return PTR_ERR(set);
4123
4124         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4125         if (skb2 == NULL)
4126                 return -ENOMEM;
4127
4128         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4129         if (err < 0)
4130                 goto err_fill_set_info;
4131
4132         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4133
4134 err_fill_set_info:
4135         kfree_skb(skb2);
4136         return err;
4137 }
4138
4139 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4140         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4141 };
4142
4143 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4144                                      struct nft_set_desc *desc)
4145 {
4146         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4147         u32 len;
4148         int err;
4149
4150         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4151                                           nft_concat_policy, NULL);
4152         if (err < 0)
4153                 return err;
4154
4155         if (!tb[NFTA_SET_FIELD_LEN])
4156                 return -EINVAL;
4157
4158         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4159
4160         if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4161                 return -E2BIG;
4162
4163         desc->field_len[desc->field_count++] = len;
4164
4165         return 0;
4166 }
4167
4168 static int nft_set_desc_concat(struct nft_set_desc *desc,
4169                                const struct nlattr *nla)
4170 {
4171         struct nlattr *attr;
4172         int rem, err;
4173
4174         nla_for_each_nested(attr, nla, rem) {
4175                 if (nla_type(attr) != NFTA_LIST_ELEM)
4176                         return -EINVAL;
4177
4178                 err = nft_set_desc_concat_parse(attr, desc);
4179                 if (err < 0)
4180                         return err;
4181         }
4182
4183         return 0;
4184 }
4185
4186 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4187                                     const struct nlattr *nla)
4188 {
4189         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4190         int err;
4191
4192         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4193                                           nft_set_desc_policy, NULL);
4194         if (err < 0)
4195                 return err;
4196
4197         if (da[NFTA_SET_DESC_SIZE] != NULL)
4198                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4199         if (da[NFTA_SET_DESC_CONCAT])
4200                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4201
4202         return err;
4203 }
4204
4205 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4206                             const struct nlattr * const nla[])
4207 {
4208         u32 ktype, dtype, flags, policy, gc_int, objtype;
4209         struct netlink_ext_ack *extack = info->extack;
4210         u8 genmask = nft_genmask_next(info->net);
4211         u8 family = info->nfmsg->nfgen_family;
4212         const struct nft_set_ops *ops;
4213         struct nft_expr *expr = NULL;
4214         struct net *net = info->net;
4215         struct nft_set_desc desc;
4216         struct nft_table *table;
4217         unsigned char *udata;
4218         struct nft_set *set;
4219         struct nft_ctx ctx;
4220         size_t alloc_size;
4221         u64 timeout;
4222         char *name;
4223         int err, i;
4224         u16 udlen;
4225         u64 size;
4226
4227         if (nla[NFTA_SET_TABLE] == NULL ||
4228             nla[NFTA_SET_NAME] == NULL ||
4229             nla[NFTA_SET_KEY_LEN] == NULL ||
4230             nla[NFTA_SET_ID] == NULL)
4231                 return -EINVAL;
4232
4233         memset(&desc, 0, sizeof(desc));
4234
4235         ktype = NFT_DATA_VALUE;
4236         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4237                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4238                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4239                         return -EINVAL;
4240         }
4241
4242         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4243         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4244                 return -EINVAL;
4245
4246         flags = 0;
4247         if (nla[NFTA_SET_FLAGS] != NULL) {
4248                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4249                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4250                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4251                               NFT_SET_MAP | NFT_SET_EVAL |
4252                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4253                         return -EOPNOTSUPP;
4254                 /* Only one of these operations is supported */
4255                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4256                              (NFT_SET_MAP | NFT_SET_OBJECT))
4257                         return -EOPNOTSUPP;
4258                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4259                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4260                         return -EOPNOTSUPP;
4261         }
4262
4263         dtype = 0;
4264         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4265                 if (!(flags & NFT_SET_MAP))
4266                         return -EINVAL;
4267
4268                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4269                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4270                     dtype != NFT_DATA_VERDICT)
4271                         return -EINVAL;
4272
4273                 if (dtype != NFT_DATA_VERDICT) {
4274                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4275                                 return -EINVAL;
4276                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4277                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4278                                 return -EINVAL;
4279                 } else
4280                         desc.dlen = sizeof(struct nft_verdict);
4281         } else if (flags & NFT_SET_MAP)
4282                 return -EINVAL;
4283
4284         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4285                 if (!(flags & NFT_SET_OBJECT))
4286                         return -EINVAL;
4287
4288                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4289                 if (objtype == NFT_OBJECT_UNSPEC ||
4290                     objtype > NFT_OBJECT_MAX)
4291                         return -EOPNOTSUPP;
4292         } else if (flags & NFT_SET_OBJECT)
4293                 return -EINVAL;
4294         else
4295                 objtype = NFT_OBJECT_UNSPEC;
4296
4297         timeout = 0;
4298         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4299                 if (!(flags & NFT_SET_TIMEOUT))
4300                         return -EINVAL;
4301
4302                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4303                 if (err)
4304                         return err;
4305         }
4306         gc_int = 0;
4307         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4308                 if (!(flags & NFT_SET_TIMEOUT))
4309                         return -EINVAL;
4310                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4311         }
4312
4313         policy = NFT_SET_POL_PERFORMANCE;
4314         if (nla[NFTA_SET_POLICY] != NULL)
4315                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4316
4317         if (nla[NFTA_SET_DESC] != NULL) {
4318                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4319                 if (err < 0)
4320                         return err;
4321         }
4322
4323         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4324                 desc.expr = true;
4325
4326         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4327                                  NETLINK_CB(skb).portid);
4328         if (IS_ERR(table)) {
4329                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4330                 return PTR_ERR(table);
4331         }
4332
4333         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4334
4335         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4336         if (IS_ERR(set)) {
4337                 if (PTR_ERR(set) != -ENOENT) {
4338                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4339                         return PTR_ERR(set);
4340                 }
4341         } else {
4342                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4343                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4344                         return -EEXIST;
4345                 }
4346                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4347                         return -EOPNOTSUPP;
4348
4349                 return 0;
4350         }
4351
4352         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4353                 return -ENOENT;
4354
4355         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4356         if (IS_ERR(ops))
4357                 return PTR_ERR(ops);
4358
4359         udlen = 0;
4360         if (nla[NFTA_SET_USERDATA])
4361                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4362
4363         size = 0;
4364         if (ops->privsize != NULL)
4365                 size = ops->privsize(nla, &desc);
4366         alloc_size = sizeof(*set) + size + udlen;
4367         if (alloc_size < size || alloc_size > INT_MAX)
4368                 return -ENOMEM;
4369         set = kvzalloc(alloc_size, GFP_KERNEL);
4370         if (!set)
4371                 return -ENOMEM;
4372
4373         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4374         if (!name) {
4375                 err = -ENOMEM;
4376                 goto err_set_name;
4377         }
4378
4379         err = nf_tables_set_alloc_name(&ctx, set, name);
4380         kfree(name);
4381         if (err < 0)
4382                 goto err_set_name;
4383
4384         udata = NULL;
4385         if (udlen) {
4386                 udata = set->data + size;
4387                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4388         }
4389
4390         INIT_LIST_HEAD(&set->bindings);
4391         INIT_LIST_HEAD(&set->catchall_list);
4392         set->table = table;
4393         write_pnet(&set->net, net);
4394         set->ops = ops;
4395         set->ktype = ktype;
4396         set->klen = desc.klen;
4397         set->dtype = dtype;
4398         set->objtype = objtype;
4399         set->dlen = desc.dlen;
4400         set->flags = flags;
4401         set->size = desc.size;
4402         set->policy = policy;
4403         set->udlen = udlen;
4404         set->udata = udata;
4405         set->timeout = timeout;
4406         set->gc_int = gc_int;
4407
4408         set->field_count = desc.field_count;
4409         for (i = 0; i < desc.field_count; i++)
4410                 set->field_len[i] = desc.field_len[i];
4411
4412         err = ops->init(set, &desc, nla);
4413         if (err < 0)
4414                 goto err_set_init;
4415
4416         if (nla[NFTA_SET_EXPR]) {
4417                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4418                 if (IS_ERR(expr)) {
4419                         err = PTR_ERR(expr);
4420                         goto err_set_expr_alloc;
4421                 }
4422                 set->exprs[0] = expr;
4423                 set->num_exprs++;
4424         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4425                 struct nft_expr *expr;
4426                 struct nlattr *tmp;
4427                 int left;
4428
4429                 if (!(flags & NFT_SET_EXPR)) {
4430                         err = -EINVAL;
4431                         goto err_set_expr_alloc;
4432                 }
4433                 i = 0;
4434                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4435                         if (i == NFT_SET_EXPR_MAX) {
4436                                 err = -E2BIG;
4437                                 goto err_set_expr_alloc;
4438                         }
4439                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4440                                 err = -EINVAL;
4441                                 goto err_set_expr_alloc;
4442                         }
4443                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4444                         if (IS_ERR(expr)) {
4445                                 err = PTR_ERR(expr);
4446                                 goto err_set_expr_alloc;
4447                         }
4448                         set->exprs[i++] = expr;
4449                         set->num_exprs++;
4450                 }
4451         }
4452
4453         set->handle = nf_tables_alloc_handle(table);
4454
4455         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4456         if (err < 0)
4457                 goto err_set_expr_alloc;
4458
4459         list_add_tail_rcu(&set->list, &table->sets);
4460         table->use++;
4461         return 0;
4462
4463 err_set_expr_alloc:
4464         for (i = 0; i < set->num_exprs; i++)
4465                 nft_expr_destroy(&ctx, set->exprs[i]);
4466
4467         ops->destroy(set);
4468 err_set_init:
4469         kfree(set->name);
4470 err_set_name:
4471         kvfree(set);
4472         return err;
4473 }
4474
4475 struct nft_set_elem_catchall {
4476         struct list_head        list;
4477         struct rcu_head         rcu;
4478         void                    *elem;
4479 };
4480
4481 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4482                                      struct nft_set *set)
4483 {
4484         struct nft_set_elem_catchall *catchall;
4485
4486         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4487                 list_del_rcu(&catchall->list);
4488                 nft_set_elem_destroy(set, catchall->elem, true);
4489                 kfree_rcu(catchall);
4490         }
4491 }
4492
4493 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4494 {
4495         int i;
4496
4497         if (WARN_ON(set->use > 0))
4498                 return;
4499
4500         for (i = 0; i < set->num_exprs; i++)
4501                 nft_expr_destroy(ctx, set->exprs[i]);
4502
4503         set->ops->destroy(set);
4504         nft_set_catchall_destroy(ctx, set);
4505         kfree(set->name);
4506         kvfree(set);
4507 }
4508
4509 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4510                             const struct nlattr * const nla[])
4511 {
4512         struct netlink_ext_ack *extack = info->extack;
4513         u8 genmask = nft_genmask_next(info->net);
4514         u8 family = info->nfmsg->nfgen_family;
4515         struct net *net = info->net;
4516         const struct nlattr *attr;
4517         struct nft_table *table;
4518         struct nft_set *set;
4519         struct nft_ctx ctx;
4520
4521         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4522                 return -EAFNOSUPPORT;
4523
4524         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4525                                  genmask, NETLINK_CB(skb).portid);
4526         if (IS_ERR(table)) {
4527                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4528                 return PTR_ERR(table);
4529         }
4530
4531         if (nla[NFTA_SET_HANDLE]) {
4532                 attr = nla[NFTA_SET_HANDLE];
4533                 set = nft_set_lookup_byhandle(table, attr, genmask);
4534         } else {
4535                 attr = nla[NFTA_SET_NAME];
4536                 set = nft_set_lookup(table, attr, genmask);
4537         }
4538
4539         if (IS_ERR(set)) {
4540                 NL_SET_BAD_ATTR(extack, attr);
4541                 return PTR_ERR(set);
4542         }
4543         if (set->use ||
4544             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4545              atomic_read(&set->nelems) > 0)) {
4546                 NL_SET_BAD_ATTR(extack, attr);
4547                 return -EBUSY;
4548         }
4549
4550         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4551
4552         return nft_delset(&ctx, set);
4553 }
4554
4555 static int nft_validate_register_store(const struct nft_ctx *ctx,
4556                                        enum nft_registers reg,
4557                                        const struct nft_data *data,
4558                                        enum nft_data_types type,
4559                                        unsigned int len);
4560
4561 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4562                                      struct nft_set *set,
4563                                      struct nft_set_elem *elem)
4564 {
4565         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4566         enum nft_registers dreg;
4567
4568         dreg = nft_type_to_reg(set->dtype);
4569         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4570                                            set->dtype == NFT_DATA_VERDICT ?
4571                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4572                                            set->dlen);
4573 }
4574
4575 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4576                                         struct nft_set *set,
4577                                         const struct nft_set_iter *iter,
4578                                         struct nft_set_elem *elem)
4579 {
4580         return nft_setelem_data_validate(ctx, set, elem);
4581 }
4582
4583 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4584                                        struct nft_set *set)
4585 {
4586         u8 genmask = nft_genmask_next(ctx->net);
4587         struct nft_set_elem_catchall *catchall;
4588         struct nft_set_elem elem;
4589         struct nft_set_ext *ext;
4590         int ret = 0;
4591
4592         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4593                 ext = nft_set_elem_ext(set, catchall->elem);
4594                 if (!nft_set_elem_active(ext, genmask))
4595                         continue;
4596
4597                 elem.priv = catchall->elem;
4598                 ret = nft_setelem_data_validate(ctx, set, &elem);
4599                 if (ret < 0)
4600                         break;
4601         }
4602
4603         return ret;
4604 }
4605
4606 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4607                        struct nft_set_binding *binding)
4608 {
4609         struct nft_set_binding *i;
4610         struct nft_set_iter iter;
4611
4612         if (set->use == UINT_MAX)
4613                 return -EOVERFLOW;
4614
4615         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4616                 return -EBUSY;
4617
4618         if (binding->flags & NFT_SET_MAP) {
4619                 /* If the set is already bound to the same chain all
4620                  * jumps are already validated for that chain.
4621                  */
4622                 list_for_each_entry(i, &set->bindings, list) {
4623                         if (i->flags & NFT_SET_MAP &&
4624                             i->chain == binding->chain)
4625                                 goto bind;
4626                 }
4627
4628                 iter.genmask    = nft_genmask_next(ctx->net);
4629                 iter.skip       = 0;
4630                 iter.count      = 0;
4631                 iter.err        = 0;
4632                 iter.fn         = nf_tables_bind_check_setelem;
4633
4634                 set->ops->walk(ctx, set, &iter);
4635                 if (!iter.err)
4636                         iter.err = nft_set_catchall_bind_check(ctx, set);
4637
4638                 if (iter.err < 0)
4639                         return iter.err;
4640         }
4641 bind:
4642         binding->chain = ctx->chain;
4643         list_add_tail_rcu(&binding->list, &set->bindings);
4644         nft_set_trans_bind(ctx, set);
4645         set->use++;
4646
4647         return 0;
4648 }
4649 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4650
4651 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4652                                  struct nft_set_binding *binding, bool event)
4653 {
4654         list_del_rcu(&binding->list);
4655
4656         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4657                 list_del_rcu(&set->list);
4658                 if (event)
4659                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4660                                              GFP_KERNEL);
4661         }
4662 }
4663
4664 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4665                               struct nft_set_binding *binding,
4666                               enum nft_trans_phase phase)
4667 {
4668         switch (phase) {
4669         case NFT_TRANS_PREPARE:
4670                 set->use--;
4671                 return;
4672         case NFT_TRANS_ABORT:
4673         case NFT_TRANS_RELEASE:
4674                 set->use--;
4675                 fallthrough;
4676         default:
4677                 nf_tables_unbind_set(ctx, set, binding,
4678                                      phase == NFT_TRANS_COMMIT);
4679         }
4680 }
4681 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4682
4683 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4684 {
4685         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4686                 nft_set_destroy(ctx, set);
4687 }
4688 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4689
4690 const struct nft_set_ext_type nft_set_ext_types[] = {
4691         [NFT_SET_EXT_KEY]               = {
4692                 .align  = __alignof__(u32),
4693         },
4694         [NFT_SET_EXT_DATA]              = {
4695                 .align  = __alignof__(u32),
4696         },
4697         [NFT_SET_EXT_EXPRESSIONS]       = {
4698                 .align  = __alignof__(struct nft_set_elem_expr),
4699         },
4700         [NFT_SET_EXT_OBJREF]            = {
4701                 .len    = sizeof(struct nft_object *),
4702                 .align  = __alignof__(struct nft_object *),
4703         },
4704         [NFT_SET_EXT_FLAGS]             = {
4705                 .len    = sizeof(u8),
4706                 .align  = __alignof__(u8),
4707         },
4708         [NFT_SET_EXT_TIMEOUT]           = {
4709                 .len    = sizeof(u64),
4710                 .align  = __alignof__(u64),
4711         },
4712         [NFT_SET_EXT_EXPIRATION]        = {
4713                 .len    = sizeof(u64),
4714                 .align  = __alignof__(u64),
4715         },
4716         [NFT_SET_EXT_USERDATA]          = {
4717                 .len    = sizeof(struct nft_userdata),
4718                 .align  = __alignof__(struct nft_userdata),
4719         },
4720         [NFT_SET_EXT_KEY_END]           = {
4721                 .align  = __alignof__(u32),
4722         },
4723 };
4724
4725 /*
4726  * Set elements
4727  */
4728
4729 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4730         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4731         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4732         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4733         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4734         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4735         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4736                                             .len = NFT_USERDATA_MAXLEN },
4737         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4738         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4739                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4740         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4741         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4742 };
4743
4744 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4745         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4746                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4747         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4748                                             .len = NFT_SET_MAXNAMELEN - 1 },
4749         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4750         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4751 };
4752
4753 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4754                                   const struct nft_set *set,
4755                                   const struct nft_set_ext *ext)
4756 {
4757         struct nft_set_elem_expr *elem_expr;
4758         u32 size, num_exprs = 0;
4759         struct nft_expr *expr;
4760         struct nlattr *nest;
4761
4762         elem_expr = nft_set_ext_expr(ext);
4763         nft_setelem_expr_foreach(expr, elem_expr, size)
4764                 num_exprs++;
4765
4766         if (num_exprs == 1) {
4767                 expr = nft_setelem_expr_at(elem_expr, 0);
4768                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4769                         return -1;
4770
4771                 return 0;
4772         } else if (num_exprs > 1) {
4773                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4774                 if (nest == NULL)
4775                         goto nla_put_failure;
4776
4777                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4778                         expr = nft_setelem_expr_at(elem_expr, size);
4779                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4780                                 goto nla_put_failure;
4781                 }
4782                 nla_nest_end(skb, nest);
4783         }
4784         return 0;
4785
4786 nla_put_failure:
4787         return -1;
4788 }
4789
4790 static int nf_tables_fill_setelem(struct sk_buff *skb,
4791                                   const struct nft_set *set,
4792                                   const struct nft_set_elem *elem)
4793 {
4794         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4795         unsigned char *b = skb_tail_pointer(skb);
4796         struct nlattr *nest;
4797
4798         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4799         if (nest == NULL)
4800                 goto nla_put_failure;
4801
4802         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4803             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4804                           NFT_DATA_VALUE, set->klen) < 0)
4805                 goto nla_put_failure;
4806
4807         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4808             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4809                           NFT_DATA_VALUE, set->klen) < 0)
4810                 goto nla_put_failure;
4811
4812         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4813             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4814                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4815                           set->dlen) < 0)
4816                 goto nla_put_failure;
4817
4818         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4819             nft_set_elem_expr_dump(skb, set, ext))
4820                 goto nla_put_failure;
4821
4822         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4823             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4824                            (*nft_set_ext_obj(ext))->key.name) < 0)
4825                 goto nla_put_failure;
4826
4827         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4828             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4829                          htonl(*nft_set_ext_flags(ext))))
4830                 goto nla_put_failure;
4831
4832         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4833             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4834                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4835                          NFTA_SET_ELEM_PAD))
4836                 goto nla_put_failure;
4837
4838         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4839                 u64 expires, now = get_jiffies_64();
4840
4841                 expires = *nft_set_ext_expiration(ext);
4842                 if (time_before64(now, expires))
4843                         expires -= now;
4844                 else
4845                         expires = 0;
4846
4847                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4848                                  nf_jiffies64_to_msecs(expires),
4849                                  NFTA_SET_ELEM_PAD))
4850                         goto nla_put_failure;
4851         }
4852
4853         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4854                 struct nft_userdata *udata;
4855
4856                 udata = nft_set_ext_userdata(ext);
4857                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4858                             udata->len + 1, udata->data))
4859                         goto nla_put_failure;
4860         }
4861
4862         nla_nest_end(skb, nest);
4863         return 0;
4864
4865 nla_put_failure:
4866         nlmsg_trim(skb, b);
4867         return -EMSGSIZE;
4868 }
4869
4870 struct nft_set_dump_args {
4871         const struct netlink_callback   *cb;
4872         struct nft_set_iter             iter;
4873         struct sk_buff                  *skb;
4874 };
4875
4876 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4877                                   struct nft_set *set,
4878                                   const struct nft_set_iter *iter,
4879                                   struct nft_set_elem *elem)
4880 {
4881         struct nft_set_dump_args *args;
4882
4883         args = container_of(iter, struct nft_set_dump_args, iter);
4884         return nf_tables_fill_setelem(args->skb, set, elem);
4885 }
4886
4887 struct nft_set_dump_ctx {
4888         const struct nft_set    *set;
4889         struct nft_ctx          ctx;
4890 };
4891
4892 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4893                                  const struct nft_set *set)
4894 {
4895         struct nft_set_elem_catchall *catchall;
4896         u8 genmask = nft_genmask_cur(net);
4897         struct nft_set_elem elem;
4898         struct nft_set_ext *ext;
4899         int ret = 0;
4900
4901         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4902                 ext = nft_set_elem_ext(set, catchall->elem);
4903                 if (!nft_set_elem_active(ext, genmask) ||
4904                     nft_set_elem_expired(ext))
4905                         continue;
4906
4907                 elem.priv = catchall->elem;
4908                 ret = nf_tables_fill_setelem(skb, set, &elem);
4909                 break;
4910         }
4911
4912         return ret;
4913 }
4914
4915 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4916 {
4917         struct nft_set_dump_ctx *dump_ctx = cb->data;
4918         struct net *net = sock_net(skb->sk);
4919         struct nftables_pernet *nft_net;
4920         struct nft_table *table;
4921         struct nft_set *set;
4922         struct nft_set_dump_args args;
4923         bool set_found = false;
4924         struct nlmsghdr *nlh;
4925         struct nlattr *nest;
4926         u32 portid, seq;
4927         int event;
4928
4929         rcu_read_lock();
4930         nft_net = nft_pernet(net);
4931         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4932                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4933                     dump_ctx->ctx.family != table->family)
4934                         continue;
4935
4936                 if (table != dump_ctx->ctx.table)
4937                         continue;
4938
4939                 list_for_each_entry_rcu(set, &table->sets, list) {
4940                         if (set == dump_ctx->set) {
4941                                 set_found = true;
4942                                 break;
4943                         }
4944                 }
4945                 break;
4946         }
4947
4948         if (!set_found) {
4949                 rcu_read_unlock();
4950                 return -ENOENT;
4951         }
4952
4953         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4954         portid = NETLINK_CB(cb->skb).portid;
4955         seq    = cb->nlh->nlmsg_seq;
4956
4957         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
4958                            table->family, NFNETLINK_V0, nft_base_seq(net));
4959         if (!nlh)
4960                 goto nla_put_failure;
4961
4962         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4963                 goto nla_put_failure;
4964         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4965                 goto nla_put_failure;
4966
4967         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4968         if (nest == NULL)
4969                 goto nla_put_failure;
4970
4971         args.cb                 = cb;
4972         args.skb                = skb;
4973         args.iter.genmask       = nft_genmask_cur(net);
4974         args.iter.skip          = cb->args[0];
4975         args.iter.count         = 0;
4976         args.iter.err           = 0;
4977         args.iter.fn            = nf_tables_dump_setelem;
4978         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4979
4980         if (!args.iter.err && args.iter.count == cb->args[0])
4981                 args.iter.err = nft_set_catchall_dump(net, skb, set);
4982         rcu_read_unlock();
4983
4984         nla_nest_end(skb, nest);
4985         nlmsg_end(skb, nlh);
4986
4987         if (args.iter.err && args.iter.err != -EMSGSIZE)
4988                 return args.iter.err;
4989         if (args.iter.count == cb->args[0])
4990                 return 0;
4991
4992         cb->args[0] = args.iter.count;
4993         return skb->len;
4994
4995 nla_put_failure:
4996         rcu_read_unlock();
4997         return -ENOSPC;
4998 }
4999
5000 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5001 {
5002         struct nft_set_dump_ctx *dump_ctx = cb->data;
5003
5004         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5005
5006         return cb->data ? 0 : -ENOMEM;
5007 }
5008
5009 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5010 {
5011         kfree(cb->data);
5012         return 0;
5013 }
5014
5015 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5016                                        const struct nft_ctx *ctx, u32 seq,
5017                                        u32 portid, int event, u16 flags,
5018                                        const struct nft_set *set,
5019                                        const struct nft_set_elem *elem)
5020 {
5021         struct nlmsghdr *nlh;
5022         struct nlattr *nest;
5023         int err;
5024
5025         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5026         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5027                            NFNETLINK_V0, nft_base_seq(ctx->net));
5028         if (!nlh)
5029                 goto nla_put_failure;
5030
5031         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5032                 goto nla_put_failure;
5033         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5034                 goto nla_put_failure;
5035
5036         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5037         if (nest == NULL)
5038                 goto nla_put_failure;
5039
5040         err = nf_tables_fill_setelem(skb, set, elem);
5041         if (err < 0)
5042                 goto nla_put_failure;
5043
5044         nla_nest_end(skb, nest);
5045
5046         nlmsg_end(skb, nlh);
5047         return 0;
5048
5049 nla_put_failure:
5050         nlmsg_trim(skb, nlh);
5051         return -1;
5052 }
5053
5054 static int nft_setelem_parse_flags(const struct nft_set *set,
5055                                    const struct nlattr *attr, u32 *flags)
5056 {
5057         if (attr == NULL)
5058                 return 0;
5059
5060         *flags = ntohl(nla_get_be32(attr));
5061         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5062                 return -EOPNOTSUPP;
5063         if (!(set->flags & NFT_SET_INTERVAL) &&
5064             *flags & NFT_SET_ELEM_INTERVAL_END)
5065                 return -EINVAL;
5066
5067         return 0;
5068 }
5069
5070 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5071                                  struct nft_data *key, struct nlattr *attr)
5072 {
5073         struct nft_data_desc desc;
5074         int err;
5075
5076         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5077         if (err < 0)
5078                 return err;
5079
5080         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5081                 nft_data_release(key, desc.type);
5082                 return -EINVAL;
5083         }
5084
5085         return 0;
5086 }
5087
5088 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5089                                   struct nft_data_desc *desc,
5090                                   struct nft_data *data,
5091                                   struct nlattr *attr)
5092 {
5093         int err;
5094
5095         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5096         if (err < 0)
5097                 return err;
5098
5099         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
5100                 nft_data_release(data, desc->type);
5101                 return -EINVAL;
5102         }
5103
5104         return 0;
5105 }
5106
5107 static void *nft_setelem_catchall_get(const struct net *net,
5108                                       const struct nft_set *set)
5109 {
5110         struct nft_set_elem_catchall *catchall;
5111         u8 genmask = nft_genmask_cur(net);
5112         struct nft_set_ext *ext;
5113         void *priv = NULL;
5114
5115         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5116                 ext = nft_set_elem_ext(set, catchall->elem);
5117                 if (!nft_set_elem_active(ext, genmask) ||
5118                     nft_set_elem_expired(ext))
5119                         continue;
5120
5121                 priv = catchall->elem;
5122                 break;
5123         }
5124
5125         return priv;
5126 }
5127
5128 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5129                            struct nft_set_elem *elem, u32 flags)
5130 {
5131         void *priv;
5132
5133         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5134                 priv = set->ops->get(ctx->net, set, elem, flags);
5135                 if (IS_ERR(priv))
5136                         return PTR_ERR(priv);
5137         } else {
5138                 priv = nft_setelem_catchall_get(ctx->net, set);
5139                 if (!priv)
5140                         return -ENOENT;
5141         }
5142         elem->priv = priv;
5143
5144         return 0;
5145 }
5146
5147 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5148                             const struct nlattr *attr)
5149 {
5150         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5151         struct nft_set_elem elem;
5152         struct sk_buff *skb;
5153         uint32_t flags = 0;
5154         int err;
5155
5156         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5157                                           nft_set_elem_policy, NULL);
5158         if (err < 0)
5159                 return err;
5160
5161         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5162         if (err < 0)
5163                 return err;
5164
5165         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5166                 return -EINVAL;
5167
5168         if (nla[NFTA_SET_ELEM_KEY]) {
5169                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5170                                             nla[NFTA_SET_ELEM_KEY]);
5171                 if (err < 0)
5172                         return err;
5173         }
5174
5175         if (nla[NFTA_SET_ELEM_KEY_END]) {
5176                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5177                                             nla[NFTA_SET_ELEM_KEY_END]);
5178                 if (err < 0)
5179                         return err;
5180         }
5181
5182         err = nft_setelem_get(ctx, set, &elem, flags);
5183         if (err < 0)
5184                 return err;
5185
5186         err = -ENOMEM;
5187         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5188         if (skb == NULL)
5189                 return err;
5190
5191         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5192                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5193         if (err < 0)
5194                 goto err_fill_setelem;
5195
5196         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5197
5198 err_fill_setelem:
5199         kfree_skb(skb);
5200         return err;
5201 }
5202
5203 /* called with rcu_read_lock held */
5204 static int nf_tables_getsetelem(struct sk_buff *skb,
5205                                 const struct nfnl_info *info,
5206                                 const struct nlattr * const nla[])
5207 {
5208         struct netlink_ext_ack *extack = info->extack;
5209         u8 genmask = nft_genmask_cur(info->net);
5210         u8 family = info->nfmsg->nfgen_family;
5211         struct net *net = info->net;
5212         struct nft_table *table;
5213         struct nft_set *set;
5214         struct nlattr *attr;
5215         struct nft_ctx ctx;
5216         int rem, err = 0;
5217
5218         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5219                                  genmask, NETLINK_CB(skb).portid);
5220         if (IS_ERR(table)) {
5221                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5222                 return PTR_ERR(table);
5223         }
5224
5225         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5226         if (IS_ERR(set))
5227                 return PTR_ERR(set);
5228
5229         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5230
5231         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5232                 struct netlink_dump_control c = {
5233                         .start = nf_tables_dump_set_start,
5234                         .dump = nf_tables_dump_set,
5235                         .done = nf_tables_dump_set_done,
5236                         .module = THIS_MODULE,
5237                 };
5238                 struct nft_set_dump_ctx dump_ctx = {
5239                         .set = set,
5240                         .ctx = ctx,
5241                 };
5242
5243                 c.data = &dump_ctx;
5244                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5245         }
5246
5247         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5248                 return -EINVAL;
5249
5250         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5251                 err = nft_get_set_elem(&ctx, set, attr);
5252                 if (err < 0)
5253                         break;
5254         }
5255
5256         return err;
5257 }
5258
5259 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5260                                      const struct nft_set *set,
5261                                      const struct nft_set_elem *elem,
5262                                      int event)
5263 {
5264         struct nftables_pernet *nft_net;
5265         struct net *net = ctx->net;
5266         u32 portid = ctx->portid;
5267         struct sk_buff *skb;
5268         u16 flags = 0;
5269         int err;
5270
5271         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5272                 return;
5273
5274         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5275         if (skb == NULL)
5276                 goto err;
5277
5278         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5279                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5280
5281         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5282                                           set, elem);
5283         if (err < 0) {
5284                 kfree_skb(skb);
5285                 goto err;
5286         }
5287
5288         nft_net = nft_pernet(net);
5289         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5290         return;
5291 err:
5292         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5293 }
5294
5295 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5296                                               int msg_type,
5297                                               struct nft_set *set)
5298 {
5299         struct nft_trans *trans;
5300
5301         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5302         if (trans == NULL)
5303                 return NULL;
5304
5305         nft_trans_elem_set(trans) = set;
5306         return trans;
5307 }
5308
5309 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5310                                          const struct nft_set *set,
5311                                          const struct nlattr *attr)
5312 {
5313         struct nft_expr *expr;
5314         int err;
5315
5316         expr = nft_expr_init(ctx, attr);
5317         if (IS_ERR(expr))
5318                 return expr;
5319
5320         err = -EOPNOTSUPP;
5321         if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5322                 goto err_set_elem_expr;
5323
5324         if (expr->ops->type->flags & NFT_EXPR_GC) {
5325                 if (set->flags & NFT_SET_TIMEOUT)
5326                         goto err_set_elem_expr;
5327                 if (!set->ops->gc_init)
5328                         goto err_set_elem_expr;
5329                 set->ops->gc_init(set);
5330         }
5331
5332         return expr;
5333
5334 err_set_elem_expr:
5335         nft_expr_destroy(ctx, expr);
5336         return ERR_PTR(err);
5337 }
5338
5339 void *nft_set_elem_init(const struct nft_set *set,
5340                         const struct nft_set_ext_tmpl *tmpl,
5341                         const u32 *key, const u32 *key_end,
5342                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5343 {
5344         struct nft_set_ext *ext;
5345         void *elem;
5346
5347         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5348         if (elem == NULL)
5349                 return NULL;
5350
5351         ext = nft_set_elem_ext(set, elem);
5352         nft_set_ext_init(ext, tmpl);
5353
5354         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5355                 memcpy(nft_set_ext_key(ext), key, set->klen);
5356         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5357                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5358         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5359                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5360         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5361                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5362                 if (expiration == 0)
5363                         *nft_set_ext_expiration(ext) += timeout;
5364         }
5365         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5366                 *nft_set_ext_timeout(ext) = timeout;
5367
5368         return elem;
5369 }
5370
5371 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5372                                         struct nft_expr *expr)
5373 {
5374         if (expr->ops->destroy_clone) {
5375                 expr->ops->destroy_clone(ctx, expr);
5376                 module_put(expr->ops->type->owner);
5377         } else {
5378                 nf_tables_expr_destroy(ctx, expr);
5379         }
5380 }
5381
5382 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5383                                       struct nft_set_elem_expr *elem_expr)
5384 {
5385         struct nft_expr *expr;
5386         u32 size;
5387
5388         nft_setelem_expr_foreach(expr, elem_expr, size)
5389                 __nft_set_elem_expr_destroy(ctx, expr);
5390 }
5391
5392 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5393                           bool destroy_expr)
5394 {
5395         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5396         struct nft_ctx ctx = {
5397                 .net    = read_pnet(&set->net),
5398                 .family = set->table->family,
5399         };
5400
5401         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5402         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5403                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5404         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5405                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5406
5407         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5408                 (*nft_set_ext_obj(ext))->use--;
5409         kfree(elem);
5410 }
5411 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5412
5413 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5414  * with the refcounting from the preparation phase.
5415  */
5416 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5417                                        const struct nft_set *set, void *elem)
5418 {
5419         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5420
5421         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5422                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5423
5424         kfree(elem);
5425 }
5426
5427 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5428                             struct nft_expr *expr_array[])
5429 {
5430         struct nft_expr *expr;
5431         int err, i, k;
5432
5433         for (i = 0; i < set->num_exprs; i++) {
5434                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5435                 if (!expr)
5436                         goto err_expr;
5437
5438                 err = nft_expr_clone(expr, set->exprs[i]);
5439                 if (err < 0) {
5440                         nft_expr_destroy(ctx, expr);
5441                         goto err_expr;
5442                 }
5443                 expr_array[i] = expr;
5444         }
5445
5446         return 0;
5447
5448 err_expr:
5449         for (k = i - 1; k >= 0; k--)
5450                 nft_expr_destroy(ctx, expr_array[k]);
5451
5452         return -ENOMEM;
5453 }
5454
5455 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5456                                    const struct nft_set_ext *ext,
5457                                    struct nft_expr *expr_array[],
5458                                    u32 num_exprs)
5459 {
5460         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5461         struct nft_expr *expr;
5462         int i, err;
5463
5464         for (i = 0; i < num_exprs; i++) {
5465                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5466                 err = nft_expr_clone(expr, expr_array[i]);
5467                 if (err < 0)
5468                         goto err_elem_expr_setup;
5469
5470                 elem_expr->size += expr_array[i]->ops->size;
5471                 nft_expr_destroy(ctx, expr_array[i]);
5472                 expr_array[i] = NULL;
5473         }
5474
5475         return 0;
5476
5477 err_elem_expr_setup:
5478         for (; i < num_exprs; i++) {
5479                 nft_expr_destroy(ctx, expr_array[i]);
5480                 expr_array[i] = NULL;
5481         }
5482
5483         return -ENOMEM;
5484 }
5485
5486 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5487                                             const struct nft_set *set)
5488 {
5489         struct nft_set_elem_catchall *catchall;
5490         u8 genmask = nft_genmask_cur(net);
5491         struct nft_set_ext *ext;
5492
5493         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5494                 ext = nft_set_elem_ext(set, catchall->elem);
5495                 if (nft_set_elem_active(ext, genmask) &&
5496                     !nft_set_elem_expired(ext))
5497                         return ext;
5498         }
5499
5500         return NULL;
5501 }
5502 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5503
5504 void *nft_set_catchall_gc(const struct nft_set *set)
5505 {
5506         struct nft_set_elem_catchall *catchall, *next;
5507         struct nft_set_ext *ext;
5508         void *elem = NULL;
5509
5510         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5511                 ext = nft_set_elem_ext(set, catchall->elem);
5512
5513                 if (!nft_set_elem_expired(ext) ||
5514                     nft_set_elem_mark_busy(ext))
5515                         continue;
5516
5517                 elem = catchall->elem;
5518                 list_del_rcu(&catchall->list);
5519                 kfree_rcu(catchall, rcu);
5520                 break;
5521         }
5522
5523         return elem;
5524 }
5525 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5526
5527 static int nft_setelem_catchall_insert(const struct net *net,
5528                                        struct nft_set *set,
5529                                        const struct nft_set_elem *elem,
5530                                        struct nft_set_ext **pext)
5531 {
5532         struct nft_set_elem_catchall *catchall;
5533         u8 genmask = nft_genmask_next(net);
5534         struct nft_set_ext *ext;
5535
5536         list_for_each_entry(catchall, &set->catchall_list, list) {
5537                 ext = nft_set_elem_ext(set, catchall->elem);
5538                 if (nft_set_elem_active(ext, genmask)) {
5539                         *pext = ext;
5540                         return -EEXIST;
5541                 }
5542         }
5543
5544         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5545         if (!catchall)
5546                 return -ENOMEM;
5547
5548         catchall->elem = elem->priv;
5549         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5550
5551         return 0;
5552 }
5553
5554 static int nft_setelem_insert(const struct net *net,
5555                               struct nft_set *set,
5556                               const struct nft_set_elem *elem,
5557                               struct nft_set_ext **ext, unsigned int flags)
5558 {
5559         int ret;
5560
5561         if (flags & NFT_SET_ELEM_CATCHALL)
5562                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5563         else
5564                 ret = set->ops->insert(net, set, elem, ext);
5565
5566         return ret;
5567 }
5568
5569 static bool nft_setelem_is_catchall(const struct nft_set *set,
5570                                     const struct nft_set_elem *elem)
5571 {
5572         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5573
5574         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5575             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5576                 return true;
5577
5578         return false;
5579 }
5580
5581 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5582                                  struct nft_set_elem *elem)
5583 {
5584         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5585
5586         if (nft_setelem_is_catchall(set, elem)) {
5587                 nft_set_elem_change_active(net, set, ext);
5588                 nft_set_elem_clear_busy(ext);
5589         } else {
5590                 set->ops->activate(net, set, elem);
5591         }
5592 }
5593
5594 static int nft_setelem_catchall_deactivate(const struct net *net,
5595                                            struct nft_set *set,
5596                                            struct nft_set_elem *elem)
5597 {
5598         struct nft_set_elem_catchall *catchall;
5599         struct nft_set_ext *ext;
5600
5601         list_for_each_entry(catchall, &set->catchall_list, list) {
5602                 ext = nft_set_elem_ext(set, catchall->elem);
5603                 if (!nft_is_active(net, ext) ||
5604                     nft_set_elem_mark_busy(ext))
5605                         continue;
5606
5607                 kfree(elem->priv);
5608                 elem->priv = catchall->elem;
5609                 nft_set_elem_change_active(net, set, ext);
5610                 return 0;
5611         }
5612
5613         return -ENOENT;
5614 }
5615
5616 static int __nft_setelem_deactivate(const struct net *net,
5617                                     struct nft_set *set,
5618                                     struct nft_set_elem *elem)
5619 {
5620         void *priv;
5621
5622         priv = set->ops->deactivate(net, set, elem);
5623         if (!priv)
5624                 return -ENOENT;
5625
5626         kfree(elem->priv);
5627         elem->priv = priv;
5628         set->ndeact++;
5629
5630         return 0;
5631 }
5632
5633 static int nft_setelem_deactivate(const struct net *net,
5634                                   struct nft_set *set,
5635                                   struct nft_set_elem *elem, u32 flags)
5636 {
5637         int ret;
5638
5639         if (flags & NFT_SET_ELEM_CATCHALL)
5640                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5641         else
5642                 ret = __nft_setelem_deactivate(net, set, elem);
5643
5644         return ret;
5645 }
5646
5647 static void nft_setelem_catchall_remove(const struct net *net,
5648                                         const struct nft_set *set,
5649                                         const struct nft_set_elem *elem)
5650 {
5651         struct nft_set_elem_catchall *catchall, *next;
5652
5653         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5654                 if (catchall->elem == elem->priv) {
5655                         list_del_rcu(&catchall->list);
5656                         kfree_rcu(catchall);
5657                         break;
5658                 }
5659         }
5660 }
5661
5662 static void nft_setelem_remove(const struct net *net,
5663                                const struct nft_set *set,
5664                                const struct nft_set_elem *elem)
5665 {
5666         if (nft_setelem_is_catchall(set, elem))
5667                 nft_setelem_catchall_remove(net, set, elem);
5668         else
5669                 set->ops->remove(net, set, elem);
5670 }
5671
5672 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5673                             const struct nlattr *attr, u32 nlmsg_flags)
5674 {
5675         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5676         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5677         u8 genmask = nft_genmask_next(ctx->net);
5678         u32 flags = 0, size = 0, num_exprs = 0;
5679         struct nft_set_ext_tmpl tmpl;
5680         struct nft_set_ext *ext, *ext2;
5681         struct nft_set_elem elem;
5682         struct nft_set_binding *binding;
5683         struct nft_object *obj = NULL;
5684         struct nft_userdata *udata;
5685         struct nft_data_desc desc;
5686         enum nft_registers dreg;
5687         struct nft_trans *trans;
5688         u64 timeout;
5689         u64 expiration;
5690         int err, i;
5691         u8 ulen;
5692
5693         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5694                                           nft_set_elem_policy, NULL);
5695         if (err < 0)
5696                 return err;
5697
5698         nft_set_ext_prepare(&tmpl);
5699
5700         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5701         if (err < 0)
5702                 return err;
5703
5704         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5705                 return -EINVAL;
5706
5707         if (flags != 0)
5708                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5709
5710         if (set->flags & NFT_SET_MAP) {
5711                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5712                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5713                         return -EINVAL;
5714         } else {
5715                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5716                         return -EINVAL;
5717         }
5718
5719         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5720              (nla[NFTA_SET_ELEM_DATA] ||
5721               nla[NFTA_SET_ELEM_OBJREF] ||
5722               nla[NFTA_SET_ELEM_TIMEOUT] ||
5723               nla[NFTA_SET_ELEM_EXPIRATION] ||
5724               nla[NFTA_SET_ELEM_USERDATA] ||
5725               nla[NFTA_SET_ELEM_EXPR] ||
5726               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5727                 return -EINVAL;
5728
5729         timeout = 0;
5730         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5731                 if (!(set->flags & NFT_SET_TIMEOUT))
5732                         return -EINVAL;
5733                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5734                                             &timeout);
5735                 if (err)
5736                         return err;
5737         } else if (set->flags & NFT_SET_TIMEOUT) {
5738                 timeout = set->timeout;
5739         }
5740
5741         expiration = 0;
5742         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5743                 if (!(set->flags & NFT_SET_TIMEOUT))
5744                         return -EINVAL;
5745                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5746                                             &expiration);
5747                 if (err)
5748                         return err;
5749         }
5750
5751         if (nla[NFTA_SET_ELEM_EXPR]) {
5752                 struct nft_expr *expr;
5753
5754                 if (set->num_exprs && set->num_exprs != 1)
5755                         return -EOPNOTSUPP;
5756
5757                 expr = nft_set_elem_expr_alloc(ctx, set,
5758                                                nla[NFTA_SET_ELEM_EXPR]);
5759                 if (IS_ERR(expr))
5760                         return PTR_ERR(expr);
5761
5762                 expr_array[0] = expr;
5763                 num_exprs = 1;
5764
5765                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5766                         err = -EOPNOTSUPP;
5767                         goto err_set_elem_expr;
5768                 }
5769         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5770                 struct nft_expr *expr;
5771                 struct nlattr *tmp;
5772                 int left;
5773
5774                 i = 0;
5775                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5776                         if (i == NFT_SET_EXPR_MAX ||
5777                             (set->num_exprs && set->num_exprs == i)) {
5778                                 err = -E2BIG;
5779                                 goto err_set_elem_expr;
5780                         }
5781                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5782                                 err = -EINVAL;
5783                                 goto err_set_elem_expr;
5784                         }
5785                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5786                         if (IS_ERR(expr)) {
5787                                 err = PTR_ERR(expr);
5788                                 goto err_set_elem_expr;
5789                         }
5790                         expr_array[i] = expr;
5791                         num_exprs++;
5792
5793                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5794                                 err = -EOPNOTSUPP;
5795                                 goto err_set_elem_expr;
5796                         }
5797                         i++;
5798                 }
5799                 if (set->num_exprs && set->num_exprs != i) {
5800                         err = -EOPNOTSUPP;
5801                         goto err_set_elem_expr;
5802                 }
5803         } else if (set->num_exprs > 0) {
5804                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5805                 if (err < 0)
5806                         goto err_set_elem_expr_clone;
5807
5808                 num_exprs = set->num_exprs;
5809         }
5810
5811         if (nla[NFTA_SET_ELEM_KEY]) {
5812                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5813                                             nla[NFTA_SET_ELEM_KEY]);
5814                 if (err < 0)
5815                         goto err_set_elem_expr;
5816
5817                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5818         }
5819
5820         if (nla[NFTA_SET_ELEM_KEY_END]) {
5821                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5822                                             nla[NFTA_SET_ELEM_KEY_END]);
5823                 if (err < 0)
5824                         goto err_parse_key;
5825
5826                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5827         }
5828
5829         if (timeout > 0) {
5830                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5831                 if (timeout != set->timeout)
5832                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5833         }
5834
5835         if (num_exprs) {
5836                 for (i = 0; i < num_exprs; i++)
5837                         size += expr_array[i]->ops->size;
5838
5839                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5840                                        sizeof(struct nft_set_elem_expr) +
5841                                        size);
5842         }
5843
5844         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5845                 if (!(set->flags & NFT_SET_OBJECT)) {
5846                         err = -EINVAL;
5847                         goto err_parse_key_end;
5848                 }
5849                 obj = nft_obj_lookup(ctx->net, ctx->table,
5850                                      nla[NFTA_SET_ELEM_OBJREF],
5851                                      set->objtype, genmask);
5852                 if (IS_ERR(obj)) {
5853                         err = PTR_ERR(obj);
5854                         goto err_parse_key_end;
5855                 }
5856                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5857         }
5858
5859         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5860                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5861                                              nla[NFTA_SET_ELEM_DATA]);
5862                 if (err < 0)
5863                         goto err_parse_key_end;
5864
5865                 dreg = nft_type_to_reg(set->dtype);
5866                 list_for_each_entry(binding, &set->bindings, list) {
5867                         struct nft_ctx bind_ctx = {
5868                                 .net    = ctx->net,
5869                                 .family = ctx->family,
5870                                 .table  = ctx->table,
5871                                 .chain  = (struct nft_chain *)binding->chain,
5872                         };
5873
5874                         if (!(binding->flags & NFT_SET_MAP))
5875                                 continue;
5876
5877                         err = nft_validate_register_store(&bind_ctx, dreg,
5878                                                           &elem.data.val,
5879                                                           desc.type, desc.len);
5880                         if (err < 0)
5881                                 goto err_parse_data;
5882
5883                         if (desc.type == NFT_DATA_VERDICT &&
5884                             (elem.data.val.verdict.code == NFT_GOTO ||
5885                              elem.data.val.verdict.code == NFT_JUMP))
5886                                 nft_validate_state_update(ctx->net,
5887                                                           NFT_VALIDATE_NEED);
5888                 }
5889
5890                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5891         }
5892
5893         /* The full maximum length of userdata can exceed the maximum
5894          * offset value (U8_MAX) for following extensions, therefor it
5895          * must be the last extension added.
5896          */
5897         ulen = 0;
5898         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5899                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5900                 if (ulen > 0)
5901                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5902                                                ulen);
5903         }
5904
5905         err = -ENOMEM;
5906         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5907                                       elem.key_end.val.data, elem.data.val.data,
5908                                       timeout, expiration, GFP_KERNEL);
5909         if (elem.priv == NULL)
5910                 goto err_parse_data;
5911
5912         ext = nft_set_elem_ext(set, elem.priv);
5913         if (flags)
5914                 *nft_set_ext_flags(ext) = flags;
5915         if (ulen > 0) {
5916                 udata = nft_set_ext_userdata(ext);
5917                 udata->len = ulen - 1;
5918                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5919         }
5920         if (obj) {
5921                 *nft_set_ext_obj(ext) = obj;
5922                 obj->use++;
5923         }
5924         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5925         if (err < 0)
5926                 goto err_elem_expr;
5927
5928         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5929         if (trans == NULL) {
5930                 err = -ENOMEM;
5931                 goto err_elem_expr;
5932         }
5933
5934         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5935
5936         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
5937         if (err) {
5938                 if (err == -EEXIST) {
5939                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5940                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5941                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5942                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5943                                 goto err_element_clash;
5944                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5945                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5946                              memcmp(nft_set_ext_data(ext),
5947                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
5948                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5949                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5950                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5951                                 goto err_element_clash;
5952                         else if (!(nlmsg_flags & NLM_F_EXCL))
5953                                 err = 0;
5954                 } else if (err == -ENOTEMPTY) {
5955                         /* ENOTEMPTY reports overlapping between this element
5956                          * and an existing one.
5957                          */
5958                         err = -EEXIST;
5959                 }
5960                 goto err_element_clash;
5961         }
5962
5963         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
5964             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5965                 err = -ENFILE;
5966                 goto err_set_full;
5967         }
5968
5969         nft_trans_elem(trans) = elem;
5970         nft_trans_commit_list_add_tail(ctx->net, trans);
5971         return 0;
5972
5973 err_set_full:
5974         nft_setelem_remove(ctx->net, set, &elem);
5975 err_element_clash:
5976         kfree(trans);
5977 err_elem_expr:
5978         if (obj)
5979                 obj->use--;
5980
5981         nf_tables_set_elem_destroy(ctx, set, elem.priv);
5982 err_parse_data:
5983         if (nla[NFTA_SET_ELEM_DATA] != NULL)
5984                 nft_data_release(&elem.data.val, desc.type);
5985 err_parse_key_end:
5986         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5987 err_parse_key:
5988         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5989 err_set_elem_expr:
5990         for (i = 0; i < num_exprs && expr_array[i]; i++)
5991                 nft_expr_destroy(ctx, expr_array[i]);
5992 err_set_elem_expr_clone:
5993         return err;
5994 }
5995
5996 static int nf_tables_newsetelem(struct sk_buff *skb,
5997                                 const struct nfnl_info *info,
5998                                 const struct nlattr * const nla[])
5999 {
6000         struct nftables_pernet *nft_net = nft_pernet(info->net);
6001         struct netlink_ext_ack *extack = info->extack;
6002         u8 genmask = nft_genmask_next(info->net);
6003         u8 family = info->nfmsg->nfgen_family;
6004         struct net *net = info->net;
6005         const struct nlattr *attr;
6006         struct nft_table *table;
6007         struct nft_set *set;
6008         struct nft_ctx ctx;
6009         int rem, err;
6010
6011         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6012                 return -EINVAL;
6013
6014         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6015                                  genmask, NETLINK_CB(skb).portid);
6016         if (IS_ERR(table)) {
6017                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6018                 return PTR_ERR(table);
6019         }
6020
6021         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6022                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6023         if (IS_ERR(set))
6024                 return PTR_ERR(set);
6025
6026         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6027                 return -EBUSY;
6028
6029         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6030
6031         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6032                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6033                 if (err < 0)
6034                         return err;
6035         }
6036
6037         if (nft_net->validate_state == NFT_VALIDATE_DO)
6038                 return nft_table_validate(net, table);
6039
6040         return 0;
6041 }
6042
6043 /**
6044  *      nft_data_hold - hold a nft_data item
6045  *
6046  *      @data: struct nft_data to release
6047  *      @type: type of data
6048  *
6049  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6050  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6051  *      NFT_GOTO verdicts. This function must be called on active data objects
6052  *      from the second phase of the commit protocol.
6053  */
6054 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6055 {
6056         struct nft_chain *chain;
6057         struct nft_rule *rule;
6058
6059         if (type == NFT_DATA_VERDICT) {
6060                 switch (data->verdict.code) {
6061                 case NFT_JUMP:
6062                 case NFT_GOTO:
6063                         chain = data->verdict.chain;
6064                         chain->use++;
6065
6066                         if (!nft_chain_is_bound(chain))
6067                                 break;
6068
6069                         chain->table->use++;
6070                         list_for_each_entry(rule, &chain->rules, list)
6071                                 chain->use++;
6072
6073                         nft_chain_add(chain->table, chain);
6074                         break;
6075                 }
6076         }
6077 }
6078
6079 static void nft_setelem_data_activate(const struct net *net,
6080                                       const struct nft_set *set,
6081                                       struct nft_set_elem *elem)
6082 {
6083         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6084
6085         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6086                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6087         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6088                 (*nft_set_ext_obj(ext))->use++;
6089 }
6090
6091 static void nft_setelem_data_deactivate(const struct net *net,
6092                                         const struct nft_set *set,
6093                                         struct nft_set_elem *elem)
6094 {
6095         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6096
6097         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6098                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6099         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6100                 (*nft_set_ext_obj(ext))->use--;
6101 }
6102
6103 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6104                            const struct nlattr *attr)
6105 {
6106         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6107         struct nft_set_ext_tmpl tmpl;
6108         struct nft_set_elem elem;
6109         struct nft_set_ext *ext;
6110         struct nft_trans *trans;
6111         u32 flags = 0;
6112         int err;
6113
6114         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6115                                           nft_set_elem_policy, NULL);
6116         if (err < 0)
6117                 return err;
6118
6119         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6120         if (err < 0)
6121                 return err;
6122
6123         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6124                 return -EINVAL;
6125
6126         nft_set_ext_prepare(&tmpl);
6127
6128         if (flags != 0)
6129                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6130
6131         if (nla[NFTA_SET_ELEM_KEY]) {
6132                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6133                                             nla[NFTA_SET_ELEM_KEY]);
6134                 if (err < 0)
6135                         return err;
6136
6137                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6138         }
6139
6140         if (nla[NFTA_SET_ELEM_KEY_END]) {
6141                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6142                                             nla[NFTA_SET_ELEM_KEY_END]);
6143                 if (err < 0)
6144                         return err;
6145
6146                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6147         }
6148
6149         err = -ENOMEM;
6150         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6151                                       elem.key_end.val.data, NULL, 0, 0,
6152                                       GFP_KERNEL);
6153         if (elem.priv == NULL)
6154                 goto fail_elem;
6155
6156         ext = nft_set_elem_ext(set, elem.priv);
6157         if (flags)
6158                 *nft_set_ext_flags(ext) = flags;
6159
6160         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6161         if (trans == NULL)
6162                 goto fail_trans;
6163
6164         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6165         if (err < 0)
6166                 goto fail_ops;
6167
6168         nft_setelem_data_deactivate(ctx->net, set, &elem);
6169
6170         nft_trans_elem(trans) = elem;
6171         nft_trans_commit_list_add_tail(ctx->net, trans);
6172         return 0;
6173
6174 fail_ops:
6175         kfree(trans);
6176 fail_trans:
6177         kfree(elem.priv);
6178 fail_elem:
6179         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6180         return err;
6181 }
6182
6183 static int nft_setelem_flush(const struct nft_ctx *ctx,
6184                              struct nft_set *set,
6185                              const struct nft_set_iter *iter,
6186                              struct nft_set_elem *elem)
6187 {
6188         struct nft_trans *trans;
6189         int err;
6190
6191         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6192                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6193         if (!trans)
6194                 return -ENOMEM;
6195
6196         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6197                 err = -ENOENT;
6198                 goto err1;
6199         }
6200         set->ndeact++;
6201
6202         nft_setelem_data_deactivate(ctx->net, set, elem);
6203         nft_trans_elem_set(trans) = set;
6204         nft_trans_elem(trans) = *elem;
6205         nft_trans_commit_list_add_tail(ctx->net, trans);
6206
6207         return 0;
6208 err1:
6209         kfree(trans);
6210         return err;
6211 }
6212
6213 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6214                                     struct nft_set *set,
6215                                     struct nft_set_elem *elem)
6216 {
6217         struct nft_trans *trans;
6218
6219         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6220                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6221         if (!trans)
6222                 return -ENOMEM;
6223
6224         nft_setelem_data_deactivate(ctx->net, set, elem);
6225         nft_trans_elem_set(trans) = set;
6226         nft_trans_elem(trans) = *elem;
6227         nft_trans_commit_list_add_tail(ctx->net, trans);
6228
6229         return 0;
6230 }
6231
6232 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6233                                   struct nft_set *set)
6234 {
6235         u8 genmask = nft_genmask_next(ctx->net);
6236         struct nft_set_elem_catchall *catchall;
6237         struct nft_set_elem elem;
6238         struct nft_set_ext *ext;
6239         int ret = 0;
6240
6241         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6242                 ext = nft_set_elem_ext(set, catchall->elem);
6243                 if (!nft_set_elem_active(ext, genmask) ||
6244                     nft_set_elem_mark_busy(ext))
6245                         continue;
6246
6247                 elem.priv = catchall->elem;
6248                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6249                 if (ret < 0)
6250                         break;
6251         }
6252
6253         return ret;
6254 }
6255
6256 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6257 {
6258         struct nft_set_iter iter = {
6259                 .genmask        = genmask,
6260                 .fn             = nft_setelem_flush,
6261         };
6262
6263         set->ops->walk(ctx, set, &iter);
6264         if (!iter.err)
6265                 iter.err = nft_set_catchall_flush(ctx, set);
6266
6267         return iter.err;
6268 }
6269
6270 static int nf_tables_delsetelem(struct sk_buff *skb,
6271                                 const struct nfnl_info *info,
6272                                 const struct nlattr * const nla[])
6273 {
6274         struct netlink_ext_ack *extack = info->extack;
6275         u8 genmask = nft_genmask_next(info->net);
6276         u8 family = info->nfmsg->nfgen_family;
6277         struct net *net = info->net;
6278         const struct nlattr *attr;
6279         struct nft_table *table;
6280         struct nft_set *set;
6281         struct nft_ctx ctx;
6282         int rem, err = 0;
6283
6284         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6285                                  genmask, NETLINK_CB(skb).portid);
6286         if (IS_ERR(table)) {
6287                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6288                 return PTR_ERR(table);
6289         }
6290
6291         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6292         if (IS_ERR(set))
6293                 return PTR_ERR(set);
6294         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6295                 return -EBUSY;
6296
6297         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6298
6299         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6300                 return nft_set_flush(&ctx, set, genmask);
6301
6302         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6303                 err = nft_del_setelem(&ctx, set, attr);
6304                 if (err < 0)
6305                         break;
6306         }
6307         return err;
6308 }
6309
6310 void nft_set_gc_batch_release(struct rcu_head *rcu)
6311 {
6312         struct nft_set_gc_batch *gcb;
6313         unsigned int i;
6314
6315         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6316         for (i = 0; i < gcb->head.cnt; i++)
6317                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6318         kfree(gcb);
6319 }
6320
6321 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6322                                                 gfp_t gfp)
6323 {
6324         struct nft_set_gc_batch *gcb;
6325
6326         gcb = kzalloc(sizeof(*gcb), gfp);
6327         if (gcb == NULL)
6328                 return gcb;
6329         gcb->head.set = set;
6330         return gcb;
6331 }
6332
6333 /*
6334  * Stateful objects
6335  */
6336
6337 /**
6338  *      nft_register_obj- register nf_tables stateful object type
6339  *      @obj_type: object type
6340  *
6341  *      Registers the object type for use with nf_tables. Returns zero on
6342  *      success or a negative errno code otherwise.
6343  */
6344 int nft_register_obj(struct nft_object_type *obj_type)
6345 {
6346         if (obj_type->type == NFT_OBJECT_UNSPEC)
6347                 return -EINVAL;
6348
6349         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6350         list_add_rcu(&obj_type->list, &nf_tables_objects);
6351         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6352         return 0;
6353 }
6354 EXPORT_SYMBOL_GPL(nft_register_obj);
6355
6356 /**
6357  *      nft_unregister_obj - unregister nf_tables object type
6358  *      @obj_type: object type
6359  *
6360  *      Unregisters the object type for use with nf_tables.
6361  */
6362 void nft_unregister_obj(struct nft_object_type *obj_type)
6363 {
6364         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6365         list_del_rcu(&obj_type->list);
6366         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6367 }
6368 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6369
6370 struct nft_object *nft_obj_lookup(const struct net *net,
6371                                   const struct nft_table *table,
6372                                   const struct nlattr *nla, u32 objtype,
6373                                   u8 genmask)
6374 {
6375         struct nft_object_hash_key k = { .table = table };
6376         char search[NFT_OBJ_MAXNAMELEN];
6377         struct rhlist_head *tmp, *list;
6378         struct nft_object *obj;
6379
6380         nla_strscpy(search, nla, sizeof(search));
6381         k.name = search;
6382
6383         WARN_ON_ONCE(!rcu_read_lock_held() &&
6384                      !lockdep_commit_lock_is_held(net));
6385
6386         rcu_read_lock();
6387         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6388         if (!list)
6389                 goto out;
6390
6391         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6392                 if (objtype == obj->ops->type->type &&
6393                     nft_active_genmask(obj, genmask)) {
6394                         rcu_read_unlock();
6395                         return obj;
6396                 }
6397         }
6398 out:
6399         rcu_read_unlock();
6400         return ERR_PTR(-ENOENT);
6401 }
6402 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6403
6404 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6405                                                   const struct nlattr *nla,
6406                                                   u32 objtype, u8 genmask)
6407 {
6408         struct nft_object *obj;
6409
6410         list_for_each_entry(obj, &table->objects, list) {
6411                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6412                     objtype == obj->ops->type->type &&
6413                     nft_active_genmask(obj, genmask))
6414                         return obj;
6415         }
6416         return ERR_PTR(-ENOENT);
6417 }
6418
6419 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6420         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6421                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6422         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6423                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6424         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6425         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6426         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6427         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6428                                     .len = NFT_USERDATA_MAXLEN },
6429 };
6430
6431 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6432                                        const struct nft_object_type *type,
6433                                        const struct nlattr *attr)
6434 {
6435         struct nlattr **tb;
6436         const struct nft_object_ops *ops;
6437         struct nft_object *obj;
6438         int err = -ENOMEM;
6439
6440         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6441         if (!tb)
6442                 goto err1;
6443
6444         if (attr) {
6445                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6446                                                   type->policy, NULL);
6447                 if (err < 0)
6448                         goto err2;
6449         } else {
6450                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6451         }
6452
6453         if (type->select_ops) {
6454                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6455                 if (IS_ERR(ops)) {
6456                         err = PTR_ERR(ops);
6457                         goto err2;
6458                 }
6459         } else {
6460                 ops = type->ops;
6461         }
6462
6463         err = -ENOMEM;
6464         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6465         if (!obj)
6466                 goto err2;
6467
6468         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6469         if (err < 0)
6470                 goto err3;
6471
6472         obj->ops = ops;
6473
6474         kfree(tb);
6475         return obj;
6476 err3:
6477         kfree(obj);
6478 err2:
6479         kfree(tb);
6480 err1:
6481         return ERR_PTR(err);
6482 }
6483
6484 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6485                            struct nft_object *obj, bool reset)
6486 {
6487         struct nlattr *nest;
6488
6489         nest = nla_nest_start_noflag(skb, attr);
6490         if (!nest)
6491                 goto nla_put_failure;
6492         if (obj->ops->dump(skb, obj, reset) < 0)
6493                 goto nla_put_failure;
6494         nla_nest_end(skb, nest);
6495         return 0;
6496
6497 nla_put_failure:
6498         return -1;
6499 }
6500
6501 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6502 {
6503         const struct nft_object_type *type;
6504
6505         list_for_each_entry(type, &nf_tables_objects, list) {
6506                 if (objtype == type->type)
6507                         return type;
6508         }
6509         return NULL;
6510 }
6511
6512 static const struct nft_object_type *
6513 nft_obj_type_get(struct net *net, u32 objtype)
6514 {
6515         const struct nft_object_type *type;
6516
6517         type = __nft_obj_type_get(objtype);
6518         if (type != NULL && try_module_get(type->owner))
6519                 return type;
6520
6521         lockdep_nfnl_nft_mutex_not_held();
6522 #ifdef CONFIG_MODULES
6523         if (type == NULL) {
6524                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6525                         return ERR_PTR(-EAGAIN);
6526         }
6527 #endif
6528         return ERR_PTR(-ENOENT);
6529 }
6530
6531 static int nf_tables_updobj(const struct nft_ctx *ctx,
6532                             const struct nft_object_type *type,
6533                             const struct nlattr *attr,
6534                             struct nft_object *obj)
6535 {
6536         struct nft_object *newobj;
6537         struct nft_trans *trans;
6538         int err;
6539
6540         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6541                                 sizeof(struct nft_trans_obj));
6542         if (!trans)
6543                 return -ENOMEM;
6544
6545         newobj = nft_obj_init(ctx, type, attr);
6546         if (IS_ERR(newobj)) {
6547                 err = PTR_ERR(newobj);
6548                 goto err_free_trans;
6549         }
6550
6551         nft_trans_obj(trans) = obj;
6552         nft_trans_obj_update(trans) = true;
6553         nft_trans_obj_newobj(trans) = newobj;
6554         nft_trans_commit_list_add_tail(ctx->net, trans);
6555
6556         return 0;
6557
6558 err_free_trans:
6559         kfree(trans);
6560         return err;
6561 }
6562
6563 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6564                             const struct nlattr * const nla[])
6565 {
6566         struct netlink_ext_ack *extack = info->extack;
6567         u8 genmask = nft_genmask_next(info->net);
6568         u8 family = info->nfmsg->nfgen_family;
6569         const struct nft_object_type *type;
6570         struct net *net = info->net;
6571         struct nft_table *table;
6572         struct nft_object *obj;
6573         struct nft_ctx ctx;
6574         u32 objtype;
6575         int err;
6576
6577         if (!nla[NFTA_OBJ_TYPE] ||
6578             !nla[NFTA_OBJ_NAME] ||
6579             !nla[NFTA_OBJ_DATA])
6580                 return -EINVAL;
6581
6582         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6583                                  NETLINK_CB(skb).portid);
6584         if (IS_ERR(table)) {
6585                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6586                 return PTR_ERR(table);
6587         }
6588
6589         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6590         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6591         if (IS_ERR(obj)) {
6592                 err = PTR_ERR(obj);
6593                 if (err != -ENOENT) {
6594                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6595                         return err;
6596                 }
6597         } else {
6598                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6599                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6600                         return -EEXIST;
6601                 }
6602                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6603                         return -EOPNOTSUPP;
6604
6605                 type = __nft_obj_type_get(objtype);
6606                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6607
6608                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6609         }
6610
6611         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6612
6613         type = nft_obj_type_get(net, objtype);
6614         if (IS_ERR(type))
6615                 return PTR_ERR(type);
6616
6617         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6618         if (IS_ERR(obj)) {
6619                 err = PTR_ERR(obj);
6620                 goto err_init;
6621         }
6622         obj->key.table = table;
6623         obj->handle = nf_tables_alloc_handle(table);
6624
6625         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6626         if (!obj->key.name) {
6627                 err = -ENOMEM;
6628                 goto err_strdup;
6629         }
6630
6631         if (nla[NFTA_OBJ_USERDATA]) {
6632                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6633                 if (obj->udata == NULL)
6634                         goto err_userdata;
6635
6636                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6637         }
6638
6639         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6640         if (err < 0)
6641                 goto err_trans;
6642
6643         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6644                               nft_objname_ht_params);
6645         if (err < 0)
6646                 goto err_obj_ht;
6647
6648         list_add_tail_rcu(&obj->list, &table->objects);
6649         table->use++;
6650         return 0;
6651 err_obj_ht:
6652         /* queued in transaction log */
6653         INIT_LIST_HEAD(&obj->list);
6654         return err;
6655 err_trans:
6656         kfree(obj->udata);
6657 err_userdata:
6658         kfree(obj->key.name);
6659 err_strdup:
6660         if (obj->ops->destroy)
6661                 obj->ops->destroy(&ctx, obj);
6662         kfree(obj);
6663 err_init:
6664         module_put(type->owner);
6665         return err;
6666 }
6667
6668 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6669                                    u32 portid, u32 seq, int event, u32 flags,
6670                                    int family, const struct nft_table *table,
6671                                    struct nft_object *obj, bool reset)
6672 {
6673         struct nlmsghdr *nlh;
6674
6675         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6676         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6677                            NFNETLINK_V0, nft_base_seq(net));
6678         if (!nlh)
6679                 goto nla_put_failure;
6680
6681         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6682             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6683             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6684             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6685             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6686             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6687                          NFTA_OBJ_PAD))
6688                 goto nla_put_failure;
6689
6690         if (obj->udata &&
6691             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6692                 goto nla_put_failure;
6693
6694         nlmsg_end(skb, nlh);
6695         return 0;
6696
6697 nla_put_failure:
6698         nlmsg_trim(skb, nlh);
6699         return -1;
6700 }
6701
6702 struct nft_obj_filter {
6703         char            *table;
6704         u32             type;
6705 };
6706
6707 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6708 {
6709         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6710         const struct nft_table *table;
6711         unsigned int idx = 0, s_idx = cb->args[0];
6712         struct nft_obj_filter *filter = cb->data;
6713         struct net *net = sock_net(skb->sk);
6714         int family = nfmsg->nfgen_family;
6715         struct nftables_pernet *nft_net;
6716         struct nft_object *obj;
6717         bool reset = false;
6718
6719         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6720                 reset = true;
6721
6722         rcu_read_lock();
6723         nft_net = nft_pernet(net);
6724         cb->seq = nft_net->base_seq;
6725
6726         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6727                 if (family != NFPROTO_UNSPEC && family != table->family)
6728                         continue;
6729
6730                 list_for_each_entry_rcu(obj, &table->objects, list) {
6731                         if (!nft_is_active(net, obj))
6732                                 goto cont;
6733                         if (idx < s_idx)
6734                                 goto cont;
6735                         if (idx > s_idx)
6736                                 memset(&cb->args[1], 0,
6737                                        sizeof(cb->args) - sizeof(cb->args[0]));
6738                         if (filter && filter->table &&
6739                             strcmp(filter->table, table->name))
6740                                 goto cont;
6741                         if (filter &&
6742                             filter->type != NFT_OBJECT_UNSPEC &&
6743                             obj->ops->type->type != filter->type)
6744                                 goto cont;
6745                         if (reset) {
6746                                 char *buf = kasprintf(GFP_ATOMIC,
6747                                                       "%s:%u",
6748                                                       table->name,
6749                                                       nft_net->base_seq);
6750
6751                                 audit_log_nfcfg(buf,
6752                                                 family,
6753                                                 obj->handle,
6754                                                 AUDIT_NFT_OP_OBJ_RESET,
6755                                                 GFP_ATOMIC);
6756                                 kfree(buf);
6757                         }
6758
6759                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6760                                                     cb->nlh->nlmsg_seq,
6761                                                     NFT_MSG_NEWOBJ,
6762                                                     NLM_F_MULTI | NLM_F_APPEND,
6763                                                     table->family, table,
6764                                                     obj, reset) < 0)
6765                                 goto done;
6766
6767                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6768 cont:
6769                         idx++;
6770                 }
6771         }
6772 done:
6773         rcu_read_unlock();
6774
6775         cb->args[0] = idx;
6776         return skb->len;
6777 }
6778
6779 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6780 {
6781         const struct nlattr * const *nla = cb->data;
6782         struct nft_obj_filter *filter = NULL;
6783
6784         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6785                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6786                 if (!filter)
6787                         return -ENOMEM;
6788
6789                 if (nla[NFTA_OBJ_TABLE]) {
6790                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6791                         if (!filter->table) {
6792                                 kfree(filter);
6793                                 return -ENOMEM;
6794                         }
6795                 }
6796
6797                 if (nla[NFTA_OBJ_TYPE])
6798                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6799         }
6800
6801         cb->data = filter;
6802         return 0;
6803 }
6804
6805 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6806 {
6807         struct nft_obj_filter *filter = cb->data;
6808
6809         if (filter) {
6810                 kfree(filter->table);
6811                 kfree(filter);
6812         }
6813
6814         return 0;
6815 }
6816
6817 /* called with rcu_read_lock held */
6818 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6819                             const struct nlattr * const nla[])
6820 {
6821         struct netlink_ext_ack *extack = info->extack;
6822         u8 genmask = nft_genmask_cur(info->net);
6823         u8 family = info->nfmsg->nfgen_family;
6824         const struct nft_table *table;
6825         struct net *net = info->net;
6826         struct nft_object *obj;
6827         struct sk_buff *skb2;
6828         bool reset = false;
6829         u32 objtype;
6830         int err;
6831
6832         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6833                 struct netlink_dump_control c = {
6834                         .start = nf_tables_dump_obj_start,
6835                         .dump = nf_tables_dump_obj,
6836                         .done = nf_tables_dump_obj_done,
6837                         .module = THIS_MODULE,
6838                         .data = (void *)nla,
6839                 };
6840
6841                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6842         }
6843
6844         if (!nla[NFTA_OBJ_NAME] ||
6845             !nla[NFTA_OBJ_TYPE])
6846                 return -EINVAL;
6847
6848         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6849         if (IS_ERR(table)) {
6850                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6851                 return PTR_ERR(table);
6852         }
6853
6854         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6855         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6856         if (IS_ERR(obj)) {
6857                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6858                 return PTR_ERR(obj);
6859         }
6860
6861         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6862         if (!skb2)
6863                 return -ENOMEM;
6864
6865         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6866                 reset = true;
6867
6868         if (reset) {
6869                 const struct nftables_pernet *nft_net;
6870                 char *buf;
6871
6872                 nft_net = nft_pernet(net);
6873                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
6874
6875                 audit_log_nfcfg(buf,
6876                                 family,
6877                                 obj->handle,
6878                                 AUDIT_NFT_OP_OBJ_RESET,
6879                                 GFP_ATOMIC);
6880                 kfree(buf);
6881         }
6882
6883         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6884                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6885                                       family, table, obj, reset);
6886         if (err < 0)
6887                 goto err_fill_obj_info;
6888
6889         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6890
6891 err_fill_obj_info:
6892         kfree_skb(skb2);
6893         return err;
6894 }
6895
6896 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6897 {
6898         if (obj->ops->destroy)
6899                 obj->ops->destroy(ctx, obj);
6900
6901         module_put(obj->ops->type->owner);
6902         kfree(obj->key.name);
6903         kfree(obj->udata);
6904         kfree(obj);
6905 }
6906
6907 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
6908                             const struct nlattr * const nla[])
6909 {
6910         struct netlink_ext_ack *extack = info->extack;
6911         u8 genmask = nft_genmask_next(info->net);
6912         u8 family = info->nfmsg->nfgen_family;
6913         struct net *net = info->net;
6914         const struct nlattr *attr;
6915         struct nft_table *table;
6916         struct nft_object *obj;
6917         struct nft_ctx ctx;
6918         u32 objtype;
6919
6920         if (!nla[NFTA_OBJ_TYPE] ||
6921             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6922                 return -EINVAL;
6923
6924         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6925                                  NETLINK_CB(skb).portid);
6926         if (IS_ERR(table)) {
6927                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6928                 return PTR_ERR(table);
6929         }
6930
6931         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6932         if (nla[NFTA_OBJ_HANDLE]) {
6933                 attr = nla[NFTA_OBJ_HANDLE];
6934                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6935         } else {
6936                 attr = nla[NFTA_OBJ_NAME];
6937                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6938         }
6939
6940         if (IS_ERR(obj)) {
6941                 NL_SET_BAD_ATTR(extack, attr);
6942                 return PTR_ERR(obj);
6943         }
6944         if (obj->use > 0) {
6945                 NL_SET_BAD_ATTR(extack, attr);
6946                 return -EBUSY;
6947         }
6948
6949         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6950
6951         return nft_delobj(&ctx, obj);
6952 }
6953
6954 void nft_obj_notify(struct net *net, const struct nft_table *table,
6955                     struct nft_object *obj, u32 portid, u32 seq, int event,
6956                     u16 flags, int family, int report, gfp_t gfp)
6957 {
6958         struct nftables_pernet *nft_net = nft_pernet(net);
6959         struct sk_buff *skb;
6960         int err;
6961         char *buf = kasprintf(gfp, "%s:%u",
6962                               table->name, nft_net->base_seq);
6963
6964         audit_log_nfcfg(buf,
6965                         family,
6966                         obj->handle,
6967                         event == NFT_MSG_NEWOBJ ?
6968                                  AUDIT_NFT_OP_OBJ_REGISTER :
6969                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
6970                         gfp);
6971         kfree(buf);
6972
6973         if (!report &&
6974             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6975                 return;
6976
6977         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6978         if (skb == NULL)
6979                 goto err;
6980
6981         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
6982                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
6983                                       family, table, obj, false);
6984         if (err < 0) {
6985                 kfree_skb(skb);
6986                 goto err;
6987         }
6988
6989         nft_notify_enqueue(skb, report, &nft_net->notify_list);
6990         return;
6991 err:
6992         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6993 }
6994 EXPORT_SYMBOL_GPL(nft_obj_notify);
6995
6996 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6997                                  struct nft_object *obj, int event)
6998 {
6999         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7000                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7001 }
7002
7003 /*
7004  * Flow tables
7005  */
7006 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7007 {
7008         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7009         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7010         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7011 }
7012 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7013
7014 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7015 {
7016         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7017         list_del_rcu(&type->list);
7018         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7019 }
7020 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7021
7022 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7023         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7024                                             .len = NFT_NAME_MAXLEN - 1 },
7025         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7026                                             .len = NFT_NAME_MAXLEN - 1 },
7027         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7028         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7029         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7030 };
7031
7032 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7033                                            const struct nlattr *nla, u8 genmask)
7034 {
7035         struct nft_flowtable *flowtable;
7036
7037         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7038                 if (!nla_strcmp(nla, flowtable->name) &&
7039                     nft_active_genmask(flowtable, genmask))
7040                         return flowtable;
7041         }
7042         return ERR_PTR(-ENOENT);
7043 }
7044 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7045
7046 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7047                                     struct nft_flowtable *flowtable,
7048                                     enum nft_trans_phase phase)
7049 {
7050         switch (phase) {
7051         case NFT_TRANS_PREPARE:
7052         case NFT_TRANS_ABORT:
7053         case NFT_TRANS_RELEASE:
7054                 flowtable->use--;
7055                 fallthrough;
7056         default:
7057                 return;
7058         }
7059 }
7060 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7061
7062 static struct nft_flowtable *
7063 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7064                               const struct nlattr *nla, u8 genmask)
7065 {
7066        struct nft_flowtable *flowtable;
7067
7068        list_for_each_entry(flowtable, &table->flowtables, list) {
7069                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7070                    nft_active_genmask(flowtable, genmask))
7071                        return flowtable;
7072        }
7073        return ERR_PTR(-ENOENT);
7074 }
7075
7076 struct nft_flowtable_hook {
7077         u32                     num;
7078         int                     priority;
7079         struct list_head        list;
7080 };
7081
7082 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7083         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7084         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7085         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7086 };
7087
7088 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7089                                     const struct nlattr *attr,
7090                                     struct nft_flowtable_hook *flowtable_hook,
7091                                     struct nft_flowtable *flowtable, bool add)
7092 {
7093         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7094         struct nft_hook *hook;
7095         int hooknum, priority;
7096         int err;
7097
7098         INIT_LIST_HEAD(&flowtable_hook->list);
7099
7100         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7101                                           nft_flowtable_hook_policy, NULL);
7102         if (err < 0)
7103                 return err;
7104
7105         if (add) {
7106                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7107                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7108                         return -EINVAL;
7109
7110                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7111                 if (hooknum != NF_NETDEV_INGRESS)
7112                         return -EOPNOTSUPP;
7113
7114                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7115
7116                 flowtable_hook->priority        = priority;
7117                 flowtable_hook->num             = hooknum;
7118         } else {
7119                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7120                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7121                         if (hooknum != flowtable->hooknum)
7122                                 return -EOPNOTSUPP;
7123                 }
7124
7125                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7126                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7127                         if (priority != flowtable->data.priority)
7128                                 return -EOPNOTSUPP;
7129                 }
7130
7131                 flowtable_hook->priority        = flowtable->data.priority;
7132                 flowtable_hook->num             = flowtable->hooknum;
7133         }
7134
7135         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7136                 err = nf_tables_parse_netdev_hooks(ctx->net,
7137                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7138                                                    &flowtable_hook->list);
7139                 if (err < 0)
7140                         return err;
7141         }
7142
7143         list_for_each_entry(hook, &flowtable_hook->list, list) {
7144                 hook->ops.pf            = NFPROTO_NETDEV;
7145                 hook->ops.hooknum       = flowtable_hook->num;
7146                 hook->ops.priority      = flowtable_hook->priority;
7147                 hook->ops.priv          = &flowtable->data;
7148                 hook->ops.hook          = flowtable->data.type->hook;
7149         }
7150
7151         return err;
7152 }
7153
7154 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7155 {
7156         const struct nf_flowtable_type *type;
7157
7158         list_for_each_entry(type, &nf_tables_flowtables, list) {
7159                 if (family == type->family)
7160                         return type;
7161         }
7162         return NULL;
7163 }
7164
7165 static const struct nf_flowtable_type *
7166 nft_flowtable_type_get(struct net *net, u8 family)
7167 {
7168         const struct nf_flowtable_type *type;
7169
7170         type = __nft_flowtable_type_get(family);
7171         if (type != NULL && try_module_get(type->owner))
7172                 return type;
7173
7174         lockdep_nfnl_nft_mutex_not_held();
7175 #ifdef CONFIG_MODULES
7176         if (type == NULL) {
7177                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7178                         return ERR_PTR(-EAGAIN);
7179         }
7180 #endif
7181         return ERR_PTR(-ENOENT);
7182 }
7183
7184 /* Only called from error and netdev event paths. */
7185 static void nft_unregister_flowtable_hook(struct net *net,
7186                                           struct nft_flowtable *flowtable,
7187                                           struct nft_hook *hook)
7188 {
7189         nf_unregister_net_hook(net, &hook->ops);
7190         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7191                                     FLOW_BLOCK_UNBIND);
7192 }
7193
7194 static void nft_unregister_flowtable_net_hooks(struct net *net,
7195                                                struct list_head *hook_list)
7196 {
7197         struct nft_hook *hook;
7198
7199         list_for_each_entry(hook, hook_list, list)
7200                 nf_unregister_net_hook(net, &hook->ops);
7201 }
7202
7203 static int nft_register_flowtable_net_hooks(struct net *net,
7204                                             struct nft_table *table,
7205                                             struct list_head *hook_list,
7206                                             struct nft_flowtable *flowtable)
7207 {
7208         struct nft_hook *hook, *hook2, *next;
7209         struct nft_flowtable *ft;
7210         int err, i = 0;
7211
7212         list_for_each_entry(hook, hook_list, list) {
7213                 list_for_each_entry(ft, &table->flowtables, list) {
7214                         if (!nft_is_active_next(net, ft))
7215                                 continue;
7216
7217                         list_for_each_entry(hook2, &ft->hook_list, list) {
7218                                 if (hook->ops.dev == hook2->ops.dev &&
7219                                     hook->ops.pf == hook2->ops.pf) {
7220                                         err = -EEXIST;
7221                                         goto err_unregister_net_hooks;
7222                                 }
7223                         }
7224                 }
7225
7226                 err = flowtable->data.type->setup(&flowtable->data,
7227                                                   hook->ops.dev,
7228                                                   FLOW_BLOCK_BIND);
7229                 if (err < 0)
7230                         goto err_unregister_net_hooks;
7231
7232                 err = nf_register_net_hook(net, &hook->ops);
7233                 if (err < 0) {
7234                         flowtable->data.type->setup(&flowtable->data,
7235                                                     hook->ops.dev,
7236                                                     FLOW_BLOCK_UNBIND);
7237                         goto err_unregister_net_hooks;
7238                 }
7239
7240                 i++;
7241         }
7242
7243         return 0;
7244
7245 err_unregister_net_hooks:
7246         list_for_each_entry_safe(hook, next, hook_list, list) {
7247                 if (i-- <= 0)
7248                         break;
7249
7250                 nft_unregister_flowtable_hook(net, flowtable, hook);
7251                 list_del_rcu(&hook->list);
7252                 kfree_rcu(hook, rcu);
7253         }
7254
7255         return err;
7256 }
7257
7258 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7259 {
7260         struct nft_hook *hook, *next;
7261
7262         list_for_each_entry_safe(hook, next, hook_list, list) {
7263                 list_del_rcu(&hook->list);
7264                 kfree_rcu(hook, rcu);
7265         }
7266 }
7267
7268 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7269                                 struct nft_flowtable *flowtable)
7270 {
7271         const struct nlattr * const *nla = ctx->nla;
7272         struct nft_flowtable_hook flowtable_hook;
7273         struct nft_hook *hook, *next;
7274         struct nft_trans *trans;
7275         bool unregister = false;
7276         u32 flags;
7277         int err;
7278
7279         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7280                                        &flowtable_hook, flowtable, false);
7281         if (err < 0)
7282                 return err;
7283
7284         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7285                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7286                         list_del(&hook->list);
7287                         kfree(hook);
7288                 }
7289         }
7290
7291         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7292                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7293                 if (flags & ~NFT_FLOWTABLE_MASK)
7294                         return -EOPNOTSUPP;
7295                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7296                     (flags & NFT_FLOWTABLE_HW_OFFLOAD))
7297                         return -EOPNOTSUPP;
7298         } else {
7299                 flags = flowtable->data.flags;
7300         }
7301
7302         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7303                                                &flowtable_hook.list, flowtable);
7304         if (err < 0)
7305                 goto err_flowtable_update_hook;
7306
7307         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7308                                 sizeof(struct nft_trans_flowtable));
7309         if (!trans) {
7310                 unregister = true;
7311                 err = -ENOMEM;
7312                 goto err_flowtable_update_hook;
7313         }
7314
7315         nft_trans_flowtable_flags(trans) = flags;
7316         nft_trans_flowtable(trans) = flowtable;
7317         nft_trans_flowtable_update(trans) = true;
7318         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7319         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7320
7321         nft_trans_commit_list_add_tail(ctx->net, trans);
7322
7323         return 0;
7324
7325 err_flowtable_update_hook:
7326         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7327                 if (unregister)
7328                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7329                 list_del_rcu(&hook->list);
7330                 kfree_rcu(hook, rcu);
7331         }
7332
7333         return err;
7334
7335 }
7336
7337 static int nf_tables_newflowtable(struct sk_buff *skb,
7338                                   const struct nfnl_info *info,
7339                                   const struct nlattr * const nla[])
7340 {
7341         struct netlink_ext_ack *extack = info->extack;
7342         struct nft_flowtable_hook flowtable_hook;
7343         u8 genmask = nft_genmask_next(info->net);
7344         u8 family = info->nfmsg->nfgen_family;
7345         const struct nf_flowtable_type *type;
7346         struct nft_flowtable *flowtable;
7347         struct nft_hook *hook, *next;
7348         struct net *net = info->net;
7349         struct nft_table *table;
7350         struct nft_ctx ctx;
7351         int err;
7352
7353         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7354             !nla[NFTA_FLOWTABLE_NAME] ||
7355             !nla[NFTA_FLOWTABLE_HOOK])
7356                 return -EINVAL;
7357
7358         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7359                                  genmask, NETLINK_CB(skb).portid);
7360         if (IS_ERR(table)) {
7361                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7362                 return PTR_ERR(table);
7363         }
7364
7365         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7366                                          genmask);
7367         if (IS_ERR(flowtable)) {
7368                 err = PTR_ERR(flowtable);
7369                 if (err != -ENOENT) {
7370                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7371                         return err;
7372                 }
7373         } else {
7374                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7375                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7376                         return -EEXIST;
7377                 }
7378
7379                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7380
7381                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7382         }
7383
7384         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7385
7386         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7387         if (!flowtable)
7388                 return -ENOMEM;
7389
7390         flowtable->table = table;
7391         flowtable->handle = nf_tables_alloc_handle(table);
7392         INIT_LIST_HEAD(&flowtable->hook_list);
7393
7394         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7395         if (!flowtable->name) {
7396                 err = -ENOMEM;
7397                 goto err1;
7398         }
7399
7400         type = nft_flowtable_type_get(net, family);
7401         if (IS_ERR(type)) {
7402                 err = PTR_ERR(type);
7403                 goto err2;
7404         }
7405
7406         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7407                 flowtable->data.flags =
7408                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7409                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7410                         err = -EOPNOTSUPP;
7411                         goto err3;
7412                 }
7413         }
7414
7415         write_pnet(&flowtable->data.net, net);
7416         flowtable->data.type = type;
7417         err = type->init(&flowtable->data);
7418         if (err < 0)
7419                 goto err3;
7420
7421         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7422                                        &flowtable_hook, flowtable, true);
7423         if (err < 0)
7424                 goto err4;
7425
7426         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7427         flowtable->data.priority = flowtable_hook.priority;
7428         flowtable->hooknum = flowtable_hook.num;
7429
7430         err = nft_register_flowtable_net_hooks(ctx.net, table,
7431                                                &flowtable->hook_list,
7432                                                flowtable);
7433         if (err < 0) {
7434                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7435                 goto err4;
7436         }
7437
7438         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7439         if (err < 0)
7440                 goto err5;
7441
7442         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7443         table->use++;
7444
7445         return 0;
7446 err5:
7447         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7448                 nft_unregister_flowtable_hook(net, flowtable, hook);
7449                 list_del_rcu(&hook->list);
7450                 kfree_rcu(hook, rcu);
7451         }
7452 err4:
7453         flowtable->data.type->free(&flowtable->data);
7454 err3:
7455         module_put(type->owner);
7456 err2:
7457         kfree(flowtable->name);
7458 err1:
7459         kfree(flowtable);
7460         return err;
7461 }
7462
7463 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7464 {
7465         struct nft_hook *this, *next;
7466
7467         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7468                 list_del(&this->list);
7469                 kfree(this);
7470         }
7471 }
7472
7473 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7474                                  struct nft_flowtable *flowtable)
7475 {
7476         const struct nlattr * const *nla = ctx->nla;
7477         struct nft_flowtable_hook flowtable_hook;
7478         struct nft_hook *this, *hook;
7479         struct nft_trans *trans;
7480         int err;
7481
7482         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7483                                        &flowtable_hook, flowtable, false);
7484         if (err < 0)
7485                 return err;
7486
7487         list_for_each_entry(this, &flowtable_hook.list, list) {
7488                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7489                 if (!hook) {
7490                         err = -ENOENT;
7491                         goto err_flowtable_del_hook;
7492                 }
7493                 hook->inactive = true;
7494         }
7495
7496         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7497                                 sizeof(struct nft_trans_flowtable));
7498         if (!trans) {
7499                 err = -ENOMEM;
7500                 goto err_flowtable_del_hook;
7501         }
7502
7503         nft_trans_flowtable(trans) = flowtable;
7504         nft_trans_flowtable_update(trans) = true;
7505         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7506         nft_flowtable_hook_release(&flowtable_hook);
7507
7508         nft_trans_commit_list_add_tail(ctx->net, trans);
7509
7510         return 0;
7511
7512 err_flowtable_del_hook:
7513         list_for_each_entry(this, &flowtable_hook.list, list) {
7514                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7515                 if (!hook)
7516                         break;
7517
7518                 hook->inactive = false;
7519         }
7520         nft_flowtable_hook_release(&flowtable_hook);
7521
7522         return err;
7523 }
7524
7525 static int nf_tables_delflowtable(struct sk_buff *skb,
7526                                   const struct nfnl_info *info,
7527                                   const struct nlattr * const nla[])
7528 {
7529         struct netlink_ext_ack *extack = info->extack;
7530         u8 genmask = nft_genmask_next(info->net);
7531         u8 family = info->nfmsg->nfgen_family;
7532         struct nft_flowtable *flowtable;
7533         struct net *net = info->net;
7534         const struct nlattr *attr;
7535         struct nft_table *table;
7536         struct nft_ctx ctx;
7537
7538         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7539             (!nla[NFTA_FLOWTABLE_NAME] &&
7540              !nla[NFTA_FLOWTABLE_HANDLE]))
7541                 return -EINVAL;
7542
7543         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7544                                  genmask, NETLINK_CB(skb).portid);
7545         if (IS_ERR(table)) {
7546                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7547                 return PTR_ERR(table);
7548         }
7549
7550         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7551                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7552                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7553         } else {
7554                 attr = nla[NFTA_FLOWTABLE_NAME];
7555                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7556         }
7557
7558         if (IS_ERR(flowtable)) {
7559                 NL_SET_BAD_ATTR(extack, attr);
7560                 return PTR_ERR(flowtable);
7561         }
7562
7563         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7564
7565         if (nla[NFTA_FLOWTABLE_HOOK])
7566                 return nft_delflowtable_hook(&ctx, flowtable);
7567
7568         if (flowtable->use > 0) {
7569                 NL_SET_BAD_ATTR(extack, attr);
7570                 return -EBUSY;
7571         }
7572
7573         return nft_delflowtable(&ctx, flowtable);
7574 }
7575
7576 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7577                                          u32 portid, u32 seq, int event,
7578                                          u32 flags, int family,
7579                                          struct nft_flowtable *flowtable,
7580                                          struct list_head *hook_list)
7581 {
7582         struct nlattr *nest, *nest_devs;
7583         struct nft_hook *hook;
7584         struct nlmsghdr *nlh;
7585
7586         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7587         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7588                            NFNETLINK_V0, nft_base_seq(net));
7589         if (!nlh)
7590                 goto nla_put_failure;
7591
7592         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7593             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7594             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7595             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7596                          NFTA_FLOWTABLE_PAD) ||
7597             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7598                 goto nla_put_failure;
7599
7600         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7601         if (!nest)
7602                 goto nla_put_failure;
7603         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7604             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7605                 goto nla_put_failure;
7606
7607         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7608         if (!nest_devs)
7609                 goto nla_put_failure;
7610
7611         list_for_each_entry_rcu(hook, hook_list, list) {
7612                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7613                         goto nla_put_failure;
7614         }
7615         nla_nest_end(skb, nest_devs);
7616         nla_nest_end(skb, nest);
7617
7618         nlmsg_end(skb, nlh);
7619         return 0;
7620
7621 nla_put_failure:
7622         nlmsg_trim(skb, nlh);
7623         return -1;
7624 }
7625
7626 struct nft_flowtable_filter {
7627         char            *table;
7628 };
7629
7630 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7631                                     struct netlink_callback *cb)
7632 {
7633         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7634         struct nft_flowtable_filter *filter = cb->data;
7635         unsigned int idx = 0, s_idx = cb->args[0];
7636         struct net *net = sock_net(skb->sk);
7637         int family = nfmsg->nfgen_family;
7638         struct nft_flowtable *flowtable;
7639         struct nftables_pernet *nft_net;
7640         const struct nft_table *table;
7641
7642         rcu_read_lock();
7643         nft_net = nft_pernet(net);
7644         cb->seq = nft_net->base_seq;
7645
7646         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7647                 if (family != NFPROTO_UNSPEC && family != table->family)
7648                         continue;
7649
7650                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7651                         if (!nft_is_active(net, flowtable))
7652                                 goto cont;
7653                         if (idx < s_idx)
7654                                 goto cont;
7655                         if (idx > s_idx)
7656                                 memset(&cb->args[1], 0,
7657                                        sizeof(cb->args) - sizeof(cb->args[0]));
7658                         if (filter && filter->table &&
7659                             strcmp(filter->table, table->name))
7660                                 goto cont;
7661
7662                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7663                                                           cb->nlh->nlmsg_seq,
7664                                                           NFT_MSG_NEWFLOWTABLE,
7665                                                           NLM_F_MULTI | NLM_F_APPEND,
7666                                                           table->family,
7667                                                           flowtable,
7668                                                           &flowtable->hook_list) < 0)
7669                                 goto done;
7670
7671                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7672 cont:
7673                         idx++;
7674                 }
7675         }
7676 done:
7677         rcu_read_unlock();
7678
7679         cb->args[0] = idx;
7680         return skb->len;
7681 }
7682
7683 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7684 {
7685         const struct nlattr * const *nla = cb->data;
7686         struct nft_flowtable_filter *filter = NULL;
7687
7688         if (nla[NFTA_FLOWTABLE_TABLE]) {
7689                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7690                 if (!filter)
7691                         return -ENOMEM;
7692
7693                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7694                                            GFP_ATOMIC);
7695                 if (!filter->table) {
7696                         kfree(filter);
7697                         return -ENOMEM;
7698                 }
7699         }
7700
7701         cb->data = filter;
7702         return 0;
7703 }
7704
7705 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7706 {
7707         struct nft_flowtable_filter *filter = cb->data;
7708
7709         if (!filter)
7710                 return 0;
7711
7712         kfree(filter->table);
7713         kfree(filter);
7714
7715         return 0;
7716 }
7717
7718 /* called with rcu_read_lock held */
7719 static int nf_tables_getflowtable(struct sk_buff *skb,
7720                                   const struct nfnl_info *info,
7721                                   const struct nlattr * const nla[])
7722 {
7723         u8 genmask = nft_genmask_cur(info->net);
7724         u8 family = info->nfmsg->nfgen_family;
7725         struct nft_flowtable *flowtable;
7726         const struct nft_table *table;
7727         struct net *net = info->net;
7728         struct sk_buff *skb2;
7729         int err;
7730
7731         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7732                 struct netlink_dump_control c = {
7733                         .start = nf_tables_dump_flowtable_start,
7734                         .dump = nf_tables_dump_flowtable,
7735                         .done = nf_tables_dump_flowtable_done,
7736                         .module = THIS_MODULE,
7737                         .data = (void *)nla,
7738                 };
7739
7740                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7741         }
7742
7743         if (!nla[NFTA_FLOWTABLE_NAME])
7744                 return -EINVAL;
7745
7746         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7747                                  genmask, 0);
7748         if (IS_ERR(table))
7749                 return PTR_ERR(table);
7750
7751         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7752                                          genmask);
7753         if (IS_ERR(flowtable))
7754                 return PTR_ERR(flowtable);
7755
7756         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7757         if (!skb2)
7758                 return -ENOMEM;
7759
7760         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7761                                             info->nlh->nlmsg_seq,
7762                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7763                                             flowtable, &flowtable->hook_list);
7764         if (err < 0)
7765                 goto err_fill_flowtable_info;
7766
7767         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7768
7769 err_fill_flowtable_info:
7770         kfree_skb(skb2);
7771         return err;
7772 }
7773
7774 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7775                                        struct nft_flowtable *flowtable,
7776                                        struct list_head *hook_list,
7777                                        int event)
7778 {
7779         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7780         struct sk_buff *skb;
7781         u16 flags = 0;
7782         int err;
7783
7784         if (!ctx->report &&
7785             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7786                 return;
7787
7788         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7789         if (skb == NULL)
7790                 goto err;
7791
7792         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7793                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7794
7795         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7796                                             ctx->seq, event, flags,
7797                                             ctx->family, flowtable, hook_list);
7798         if (err < 0) {
7799                 kfree_skb(skb);
7800                 goto err;
7801         }
7802
7803         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7804         return;
7805 err:
7806         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7807 }
7808
7809 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7810 {
7811         struct nft_hook *hook, *next;
7812
7813         flowtable->data.type->free(&flowtable->data);
7814         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7815                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7816                                             FLOW_BLOCK_UNBIND);
7817                 list_del_rcu(&hook->list);
7818                 kfree(hook);
7819         }
7820         kfree(flowtable->name);
7821         module_put(flowtable->data.type->owner);
7822         kfree(flowtable);
7823 }
7824
7825 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7826                                    u32 portid, u32 seq)
7827 {
7828         struct nftables_pernet *nft_net = nft_pernet(net);
7829         struct nlmsghdr *nlh;
7830         char buf[TASK_COMM_LEN];
7831         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7832
7833         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7834                            NFNETLINK_V0, nft_base_seq(net));
7835         if (!nlh)
7836                 goto nla_put_failure;
7837
7838         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7839             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7840             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7841                 goto nla_put_failure;
7842
7843         nlmsg_end(skb, nlh);
7844         return 0;
7845
7846 nla_put_failure:
7847         nlmsg_trim(skb, nlh);
7848         return -EMSGSIZE;
7849 }
7850
7851 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7852                                 struct nft_flowtable *flowtable)
7853 {
7854         struct nft_hook *hook;
7855
7856         list_for_each_entry(hook, &flowtable->hook_list, list) {
7857                 if (hook->ops.dev != dev)
7858                         continue;
7859
7860                 /* flow_offload_netdev_event() cleans up entries for us. */
7861                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7862                 list_del_rcu(&hook->list);
7863                 kfree_rcu(hook, rcu);
7864                 break;
7865         }
7866 }
7867
7868 static int nf_tables_flowtable_event(struct notifier_block *this,
7869                                      unsigned long event, void *ptr)
7870 {
7871         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7872         struct nft_flowtable *flowtable;
7873         struct nftables_pernet *nft_net;
7874         struct nft_table *table;
7875         struct net *net;
7876
7877         if (event != NETDEV_UNREGISTER)
7878                 return 0;
7879
7880         net = dev_net(dev);
7881         nft_net = nft_pernet(net);
7882         mutex_lock(&nft_net->commit_mutex);
7883         list_for_each_entry(table, &nft_net->tables, list) {
7884                 list_for_each_entry(flowtable, &table->flowtables, list) {
7885                         nft_flowtable_event(event, dev, flowtable);
7886                 }
7887         }
7888         mutex_unlock(&nft_net->commit_mutex);
7889
7890         return NOTIFY_DONE;
7891 }
7892
7893 static struct notifier_block nf_tables_flowtable_notifier = {
7894         .notifier_call  = nf_tables_flowtable_event,
7895 };
7896
7897 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7898                                  int event)
7899 {
7900         struct nlmsghdr *nlh = nlmsg_hdr(skb);
7901         struct sk_buff *skb2;
7902         int err;
7903
7904         if (!nlmsg_report(nlh) &&
7905             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7906                 return;
7907
7908         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7909         if (skb2 == NULL)
7910                 goto err;
7911
7912         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7913                                       nlh->nlmsg_seq);
7914         if (err < 0) {
7915                 kfree_skb(skb2);
7916                 goto err;
7917         }
7918
7919         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7920                        nlmsg_report(nlh), GFP_KERNEL);
7921         return;
7922 err:
7923         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7924                           -ENOBUFS);
7925 }
7926
7927 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
7928                             const struct nlattr * const nla[])
7929 {
7930         struct sk_buff *skb2;
7931         int err;
7932
7933         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7934         if (skb2 == NULL)
7935                 return -ENOMEM;
7936
7937         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
7938                                       info->nlh->nlmsg_seq);
7939         if (err < 0)
7940                 goto err_fill_gen_info;
7941
7942         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
7943
7944 err_fill_gen_info:
7945         kfree_skb(skb2);
7946         return err;
7947 }
7948
7949 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7950         [NFT_MSG_NEWTABLE] = {
7951                 .call           = nf_tables_newtable,
7952                 .type           = NFNL_CB_BATCH,
7953                 .attr_count     = NFTA_TABLE_MAX,
7954                 .policy         = nft_table_policy,
7955         },
7956         [NFT_MSG_GETTABLE] = {
7957                 .call           = nf_tables_gettable,
7958                 .type           = NFNL_CB_RCU,
7959                 .attr_count     = NFTA_TABLE_MAX,
7960                 .policy         = nft_table_policy,
7961         },
7962         [NFT_MSG_DELTABLE] = {
7963                 .call           = nf_tables_deltable,
7964                 .type           = NFNL_CB_BATCH,
7965                 .attr_count     = NFTA_TABLE_MAX,
7966                 .policy         = nft_table_policy,
7967         },
7968         [NFT_MSG_NEWCHAIN] = {
7969                 .call           = nf_tables_newchain,
7970                 .type           = NFNL_CB_BATCH,
7971                 .attr_count     = NFTA_CHAIN_MAX,
7972                 .policy         = nft_chain_policy,
7973         },
7974         [NFT_MSG_GETCHAIN] = {
7975                 .call           = nf_tables_getchain,
7976                 .type           = NFNL_CB_RCU,
7977                 .attr_count     = NFTA_CHAIN_MAX,
7978                 .policy         = nft_chain_policy,
7979         },
7980         [NFT_MSG_DELCHAIN] = {
7981                 .call           = nf_tables_delchain,
7982                 .type           = NFNL_CB_BATCH,
7983                 .attr_count     = NFTA_CHAIN_MAX,
7984                 .policy         = nft_chain_policy,
7985         },
7986         [NFT_MSG_NEWRULE] = {
7987                 .call           = nf_tables_newrule,
7988                 .type           = NFNL_CB_BATCH,
7989                 .attr_count     = NFTA_RULE_MAX,
7990                 .policy         = nft_rule_policy,
7991         },
7992         [NFT_MSG_GETRULE] = {
7993                 .call           = nf_tables_getrule,
7994                 .type           = NFNL_CB_RCU,
7995                 .attr_count     = NFTA_RULE_MAX,
7996                 .policy         = nft_rule_policy,
7997         },
7998         [NFT_MSG_DELRULE] = {
7999                 .call           = nf_tables_delrule,
8000                 .type           = NFNL_CB_BATCH,
8001                 .attr_count     = NFTA_RULE_MAX,
8002                 .policy         = nft_rule_policy,
8003         },
8004         [NFT_MSG_NEWSET] = {
8005                 .call           = nf_tables_newset,
8006                 .type           = NFNL_CB_BATCH,
8007                 .attr_count     = NFTA_SET_MAX,
8008                 .policy         = nft_set_policy,
8009         },
8010         [NFT_MSG_GETSET] = {
8011                 .call           = nf_tables_getset,
8012                 .type           = NFNL_CB_RCU,
8013                 .attr_count     = NFTA_SET_MAX,
8014                 .policy         = nft_set_policy,
8015         },
8016         [NFT_MSG_DELSET] = {
8017                 .call           = nf_tables_delset,
8018                 .type           = NFNL_CB_BATCH,
8019                 .attr_count     = NFTA_SET_MAX,
8020                 .policy         = nft_set_policy,
8021         },
8022         [NFT_MSG_NEWSETELEM] = {
8023                 .call           = nf_tables_newsetelem,
8024                 .type           = NFNL_CB_BATCH,
8025                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8026                 .policy         = nft_set_elem_list_policy,
8027         },
8028         [NFT_MSG_GETSETELEM] = {
8029                 .call           = nf_tables_getsetelem,
8030                 .type           = NFNL_CB_RCU,
8031                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8032                 .policy         = nft_set_elem_list_policy,
8033         },
8034         [NFT_MSG_DELSETELEM] = {
8035                 .call           = nf_tables_delsetelem,
8036                 .type           = NFNL_CB_BATCH,
8037                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8038                 .policy         = nft_set_elem_list_policy,
8039         },
8040         [NFT_MSG_GETGEN] = {
8041                 .call           = nf_tables_getgen,
8042                 .type           = NFNL_CB_RCU,
8043         },
8044         [NFT_MSG_NEWOBJ] = {
8045                 .call           = nf_tables_newobj,
8046                 .type           = NFNL_CB_BATCH,
8047                 .attr_count     = NFTA_OBJ_MAX,
8048                 .policy         = nft_obj_policy,
8049         },
8050         [NFT_MSG_GETOBJ] = {
8051                 .call           = nf_tables_getobj,
8052                 .type           = NFNL_CB_RCU,
8053                 .attr_count     = NFTA_OBJ_MAX,
8054                 .policy         = nft_obj_policy,
8055         },
8056         [NFT_MSG_DELOBJ] = {
8057                 .call           = nf_tables_delobj,
8058                 .type           = NFNL_CB_BATCH,
8059                 .attr_count     = NFTA_OBJ_MAX,
8060                 .policy         = nft_obj_policy,
8061         },
8062         [NFT_MSG_GETOBJ_RESET] = {
8063                 .call           = nf_tables_getobj,
8064                 .type           = NFNL_CB_RCU,
8065                 .attr_count     = NFTA_OBJ_MAX,
8066                 .policy         = nft_obj_policy,
8067         },
8068         [NFT_MSG_NEWFLOWTABLE] = {
8069                 .call           = nf_tables_newflowtable,
8070                 .type           = NFNL_CB_BATCH,
8071                 .attr_count     = NFTA_FLOWTABLE_MAX,
8072                 .policy         = nft_flowtable_policy,
8073         },
8074         [NFT_MSG_GETFLOWTABLE] = {
8075                 .call           = nf_tables_getflowtable,
8076                 .type           = NFNL_CB_RCU,
8077                 .attr_count     = NFTA_FLOWTABLE_MAX,
8078                 .policy         = nft_flowtable_policy,
8079         },
8080         [NFT_MSG_DELFLOWTABLE] = {
8081                 .call           = nf_tables_delflowtable,
8082                 .type           = NFNL_CB_BATCH,
8083                 .attr_count     = NFTA_FLOWTABLE_MAX,
8084                 .policy         = nft_flowtable_policy,
8085         },
8086 };
8087
8088 static int nf_tables_validate(struct net *net)
8089 {
8090         struct nftables_pernet *nft_net = nft_pernet(net);
8091         struct nft_table *table;
8092
8093         switch (nft_net->validate_state) {
8094         case NFT_VALIDATE_SKIP:
8095                 break;
8096         case NFT_VALIDATE_NEED:
8097                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8098                 fallthrough;
8099         case NFT_VALIDATE_DO:
8100                 list_for_each_entry(table, &nft_net->tables, list) {
8101                         if (nft_table_validate(net, table) < 0)
8102                                 return -EAGAIN;
8103                 }
8104                 break;
8105         }
8106
8107         return 0;
8108 }
8109
8110 /* a drop policy has to be deferred until all rules have been activated,
8111  * otherwise a large ruleset that contains a drop-policy base chain will
8112  * cause all packets to get dropped until the full transaction has been
8113  * processed.
8114  *
8115  * We defer the drop policy until the transaction has been finalized.
8116  */
8117 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8118 {
8119         struct nft_base_chain *basechain;
8120
8121         if (nft_trans_chain_policy(trans) != NF_DROP)
8122                 return;
8123
8124         if (!nft_is_base_chain(trans->ctx.chain))
8125                 return;
8126
8127         basechain = nft_base_chain(trans->ctx.chain);
8128         basechain->policy = NF_DROP;
8129 }
8130
8131 static void nft_chain_commit_update(struct nft_trans *trans)
8132 {
8133         struct nft_base_chain *basechain;
8134
8135         if (nft_trans_chain_name(trans)) {
8136                 rhltable_remove(&trans->ctx.table->chains_ht,
8137                                 &trans->ctx.chain->rhlhead,
8138                                 nft_chain_ht_params);
8139                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8140                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8141                                     trans->ctx.chain->name,
8142                                     &trans->ctx.chain->rhlhead,
8143                                     nft_chain_ht_params);
8144         }
8145
8146         if (!nft_is_base_chain(trans->ctx.chain))
8147                 return;
8148
8149         nft_chain_stats_replace(trans);
8150
8151         basechain = nft_base_chain(trans->ctx.chain);
8152
8153         switch (nft_trans_chain_policy(trans)) {
8154         case NF_DROP:
8155         case NF_ACCEPT:
8156                 basechain->policy = nft_trans_chain_policy(trans);
8157                 break;
8158         }
8159 }
8160
8161 static void nft_obj_commit_update(struct nft_trans *trans)
8162 {
8163         struct nft_object *newobj;
8164         struct nft_object *obj;
8165
8166         obj = nft_trans_obj(trans);
8167         newobj = nft_trans_obj_newobj(trans);
8168
8169         if (obj->ops->update)
8170                 obj->ops->update(obj, newobj);
8171
8172         kfree(newobj);
8173 }
8174
8175 static void nft_commit_release(struct nft_trans *trans)
8176 {
8177         switch (trans->msg_type) {
8178         case NFT_MSG_DELTABLE:
8179                 nf_tables_table_destroy(&trans->ctx);
8180                 break;
8181         case NFT_MSG_NEWCHAIN:
8182                 free_percpu(nft_trans_chain_stats(trans));
8183                 kfree(nft_trans_chain_name(trans));
8184                 break;
8185         case NFT_MSG_DELCHAIN:
8186                 nf_tables_chain_destroy(&trans->ctx);
8187                 break;
8188         case NFT_MSG_DELRULE:
8189                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8190                 break;
8191         case NFT_MSG_DELSET:
8192                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8193                 break;
8194         case NFT_MSG_DELSETELEM:
8195                 nf_tables_set_elem_destroy(&trans->ctx,
8196                                            nft_trans_elem_set(trans),
8197                                            nft_trans_elem(trans).priv);
8198                 break;
8199         case NFT_MSG_DELOBJ:
8200                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8201                 break;
8202         case NFT_MSG_DELFLOWTABLE:
8203                 if (nft_trans_flowtable_update(trans))
8204                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8205                 else
8206                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8207                 break;
8208         }
8209
8210         if (trans->put_net)
8211                 put_net(trans->ctx.net);
8212
8213         kfree(trans);
8214 }
8215
8216 static void nf_tables_trans_destroy_work(struct work_struct *w)
8217 {
8218         struct nft_trans *trans, *next;
8219         LIST_HEAD(head);
8220
8221         spin_lock(&nf_tables_destroy_list_lock);
8222         list_splice_init(&nf_tables_destroy_list, &head);
8223         spin_unlock(&nf_tables_destroy_list_lock);
8224
8225         if (list_empty(&head))
8226                 return;
8227
8228         synchronize_rcu();
8229
8230         list_for_each_entry_safe(trans, next, &head, list) {
8231                 list_del(&trans->list);
8232                 nft_commit_release(trans);
8233         }
8234 }
8235
8236 void nf_tables_trans_destroy_flush_work(void)
8237 {
8238         flush_work(&trans_destroy_work);
8239 }
8240 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8241
8242 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8243 {
8244         struct nft_rule *rule;
8245         unsigned int alloc = 0;
8246         int i;
8247
8248         /* already handled or inactive chain? */
8249         if (chain->rules_next || !nft_is_active_next(net, chain))
8250                 return 0;
8251
8252         rule = list_entry(&chain->rules, struct nft_rule, list);
8253         i = 0;
8254
8255         list_for_each_entry_continue(rule, &chain->rules, list) {
8256                 if (nft_is_active_next(net, rule))
8257                         alloc++;
8258         }
8259
8260         chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8261         if (!chain->rules_next)
8262                 return -ENOMEM;
8263
8264         list_for_each_entry_continue(rule, &chain->rules, list) {
8265                 if (nft_is_active_next(net, rule))
8266                         chain->rules_next[i++] = rule;
8267         }
8268
8269         chain->rules_next[i] = NULL;
8270         return 0;
8271 }
8272
8273 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8274 {
8275         struct nftables_pernet *nft_net = nft_pernet(net);
8276         struct nft_trans *trans, *next;
8277
8278         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8279                 struct nft_chain *chain = trans->ctx.chain;
8280
8281                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8282                     trans->msg_type == NFT_MSG_DELRULE) {
8283                         kvfree(chain->rules_next);
8284                         chain->rules_next = NULL;
8285                 }
8286         }
8287 }
8288
8289 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8290 {
8291         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8292
8293         kvfree(o->start);
8294 }
8295
8296 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8297 {
8298         struct nft_rule **r = rules;
8299         struct nft_rules_old *old;
8300
8301         while (*r)
8302                 r++;
8303
8304         r++;    /* rcu_head is after end marker */
8305         old = (void *) r;
8306         old->start = rules;
8307
8308         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8309 }
8310
8311 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8312 {
8313         struct nft_rule **g0, **g1;
8314         bool next_genbit;
8315
8316         next_genbit = nft_gencursor_next(net);
8317
8318         g0 = rcu_dereference_protected(chain->rules_gen_0,
8319                                        lockdep_commit_lock_is_held(net));
8320         g1 = rcu_dereference_protected(chain->rules_gen_1,
8321                                        lockdep_commit_lock_is_held(net));
8322
8323         /* No changes to this chain? */
8324         if (chain->rules_next == NULL) {
8325                 /* chain had no change in last or next generation */
8326                 if (g0 == g1)
8327                         return;
8328                 /*
8329                  * chain had no change in this generation; make sure next
8330                  * one uses same rules as current generation.
8331                  */
8332                 if (next_genbit) {
8333                         rcu_assign_pointer(chain->rules_gen_1, g0);
8334                         nf_tables_commit_chain_free_rules_old(g1);
8335                 } else {
8336                         rcu_assign_pointer(chain->rules_gen_0, g1);
8337                         nf_tables_commit_chain_free_rules_old(g0);
8338                 }
8339
8340                 return;
8341         }
8342
8343         if (next_genbit)
8344                 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8345         else
8346                 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8347
8348         chain->rules_next = NULL;
8349
8350         if (g0 == g1)
8351                 return;
8352
8353         if (next_genbit)
8354                 nf_tables_commit_chain_free_rules_old(g1);
8355         else
8356                 nf_tables_commit_chain_free_rules_old(g0);
8357 }
8358
8359 static void nft_obj_del(struct nft_object *obj)
8360 {
8361         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8362         list_del_rcu(&obj->list);
8363 }
8364
8365 void nft_chain_del(struct nft_chain *chain)
8366 {
8367         struct nft_table *table = chain->table;
8368
8369         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8370                                      nft_chain_ht_params));
8371         list_del_rcu(&chain->list);
8372 }
8373
8374 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
8375                                     struct list_head *hook_list)
8376 {
8377         struct nft_hook *hook, *next;
8378
8379         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8380                 if (hook->inactive)
8381                         list_move(&hook->list, hook_list);
8382         }
8383 }
8384
8385 static void nf_tables_module_autoload_cleanup(struct net *net)
8386 {
8387         struct nftables_pernet *nft_net = nft_pernet(net);
8388         struct nft_module_request *req, *next;
8389
8390         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8391         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8392                 WARN_ON_ONCE(!req->done);
8393                 list_del(&req->list);
8394                 kfree(req);
8395         }
8396 }
8397
8398 static void nf_tables_commit_release(struct net *net)
8399 {
8400         struct nftables_pernet *nft_net = nft_pernet(net);
8401         struct nft_trans *trans;
8402
8403         /* all side effects have to be made visible.
8404          * For example, if a chain named 'foo' has been deleted, a
8405          * new transaction must not find it anymore.
8406          *
8407          * Memory reclaim happens asynchronously from work queue
8408          * to prevent expensive synchronize_rcu() in commit phase.
8409          */
8410         if (list_empty(&nft_net->commit_list)) {
8411                 nf_tables_module_autoload_cleanup(net);
8412                 mutex_unlock(&nft_net->commit_mutex);
8413                 return;
8414         }
8415
8416         trans = list_last_entry(&nft_net->commit_list,
8417                                 struct nft_trans, list);
8418         get_net(trans->ctx.net);
8419         WARN_ON_ONCE(trans->put_net);
8420
8421         trans->put_net = true;
8422         spin_lock(&nf_tables_destroy_list_lock);
8423         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8424         spin_unlock(&nf_tables_destroy_list_lock);
8425
8426         nf_tables_module_autoload_cleanup(net);
8427         schedule_work(&trans_destroy_work);
8428
8429         mutex_unlock(&nft_net->commit_mutex);
8430 }
8431
8432 static void nft_commit_notify(struct net *net, u32 portid)
8433 {
8434         struct nftables_pernet *nft_net = nft_pernet(net);
8435         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8436         unsigned char *data;
8437         int len;
8438
8439         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8440                 if (!batch_skb) {
8441 new_batch:
8442                         batch_skb = skb;
8443                         len = NLMSG_GOODSIZE - skb->len;
8444                         list_del(&skb->list);
8445                         continue;
8446                 }
8447                 len -= skb->len;
8448                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8449                         data = skb_put(batch_skb, skb->len);
8450                         memcpy(data, skb->data, skb->len);
8451                         list_del(&skb->list);
8452                         kfree_skb(skb);
8453                         continue;
8454                 }
8455                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8456                                NFT_CB(batch_skb).report, GFP_KERNEL);
8457                 goto new_batch;
8458         }
8459
8460         if (batch_skb) {
8461                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8462                                NFT_CB(batch_skb).report, GFP_KERNEL);
8463         }
8464
8465         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8466 }
8467
8468 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8469                                         struct nft_table *table)
8470 {
8471         struct nft_audit_data *adp;
8472
8473         list_for_each_entry(adp, adl, list) {
8474                 if (adp->table == table)
8475                         return 0;
8476         }
8477         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8478         if (!adp)
8479                 return -ENOMEM;
8480         adp->table = table;
8481         list_add(&adp->list, adl);
8482         return 0;
8483 }
8484
8485 static void nf_tables_commit_audit_free(struct list_head *adl)
8486 {
8487         struct nft_audit_data *adp, *adn;
8488
8489         list_for_each_entry_safe(adp, adn, adl, list) {
8490                 list_del(&adp->list);
8491                 kfree(adp);
8492         }
8493 }
8494
8495 static void nf_tables_commit_audit_collect(struct list_head *adl,
8496                                            struct nft_table *table, u32 op)
8497 {
8498         struct nft_audit_data *adp;
8499
8500         list_for_each_entry(adp, adl, list) {
8501                 if (adp->table == table)
8502                         goto found;
8503         }
8504         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8505         return;
8506 found:
8507         adp->entries++;
8508         if (!adp->op || adp->op > op)
8509                 adp->op = op;
8510 }
8511
8512 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8513
8514 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8515 {
8516         struct nft_audit_data *adp, *adn;
8517         char aubuf[AUNFTABLENAMELEN];
8518
8519         list_for_each_entry_safe(adp, adn, adl, list) {
8520                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8521                          generation);
8522                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8523                                 nft2audit_op[adp->op], GFP_KERNEL);
8524                 list_del(&adp->list);
8525                 kfree(adp);
8526         }
8527 }
8528
8529 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8530 {
8531         struct nftables_pernet *nft_net = nft_pernet(net);
8532         struct nft_trans *trans, *next;
8533         struct nft_trans_elem *te;
8534         struct nft_chain *chain;
8535         struct nft_table *table;
8536         LIST_HEAD(adl);
8537         int err;
8538
8539         if (list_empty(&nft_net->commit_list)) {
8540                 mutex_unlock(&nft_net->commit_mutex);
8541                 return 0;
8542         }
8543
8544         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8545         if (nf_tables_validate(net) < 0)
8546                 return -EAGAIN;
8547
8548         err = nft_flow_rule_offload_commit(net);
8549         if (err < 0)
8550                 return err;
8551
8552         /* 1.  Allocate space for next generation rules_gen_X[] */
8553         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8554                 int ret;
8555
8556                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8557                 if (ret) {
8558                         nf_tables_commit_chain_prepare_cancel(net);
8559                         nf_tables_commit_audit_free(&adl);
8560                         return ret;
8561                 }
8562                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8563                     trans->msg_type == NFT_MSG_DELRULE) {
8564                         chain = trans->ctx.chain;
8565
8566                         ret = nf_tables_commit_chain_prepare(net, chain);
8567                         if (ret < 0) {
8568                                 nf_tables_commit_chain_prepare_cancel(net);
8569                                 nf_tables_commit_audit_free(&adl);
8570                                 return ret;
8571                         }
8572                 }
8573         }
8574
8575         /* step 2.  Make rules_gen_X visible to packet path */
8576         list_for_each_entry(table, &nft_net->tables, list) {
8577                 list_for_each_entry(chain, &table->chains, list)
8578                         nf_tables_commit_chain(net, chain);
8579         }
8580
8581         /*
8582          * Bump generation counter, invalidate any dump in progress.
8583          * Cannot fail after this point.
8584          */
8585         while (++nft_net->base_seq == 0)
8586                 ;
8587
8588         /* step 3. Start new generation, rules_gen_X now in use. */
8589         net->nft.gencursor = nft_gencursor_next(net);
8590
8591         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8592                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8593                                                trans->msg_type);
8594                 switch (trans->msg_type) {
8595                 case NFT_MSG_NEWTABLE:
8596                         if (nft_trans_table_update(trans)) {
8597                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8598                                         nft_trans_destroy(trans);
8599                                         break;
8600                                 }
8601                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8602                                         nf_tables_table_disable(net, trans->ctx.table);
8603
8604                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8605                         } else {
8606                                 nft_clear(net, trans->ctx.table);
8607                         }
8608                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8609                         nft_trans_destroy(trans);
8610                         break;
8611                 case NFT_MSG_DELTABLE:
8612                         list_del_rcu(&trans->ctx.table->list);
8613                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8614                         break;
8615                 case NFT_MSG_NEWCHAIN:
8616                         if (nft_trans_chain_update(trans)) {
8617                                 nft_chain_commit_update(trans);
8618                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8619                                 /* trans destroyed after rcu grace period */
8620                         } else {
8621                                 nft_chain_commit_drop_policy(trans);
8622                                 nft_clear(net, trans->ctx.chain);
8623                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8624                                 nft_trans_destroy(trans);
8625                         }
8626                         break;
8627                 case NFT_MSG_DELCHAIN:
8628                         nft_chain_del(trans->ctx.chain);
8629                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8630                         nf_tables_unregister_hook(trans->ctx.net,
8631                                                   trans->ctx.table,
8632                                                   trans->ctx.chain);
8633                         break;
8634                 case NFT_MSG_NEWRULE:
8635                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8636                         nf_tables_rule_notify(&trans->ctx,
8637                                               nft_trans_rule(trans),
8638                                               NFT_MSG_NEWRULE);
8639                         nft_trans_destroy(trans);
8640                         break;
8641                 case NFT_MSG_DELRULE:
8642                         list_del_rcu(&nft_trans_rule(trans)->list);
8643                         nf_tables_rule_notify(&trans->ctx,
8644                                               nft_trans_rule(trans),
8645                                               NFT_MSG_DELRULE);
8646                         nft_rule_expr_deactivate(&trans->ctx,
8647                                                  nft_trans_rule(trans),
8648                                                  NFT_TRANS_COMMIT);
8649                         break;
8650                 case NFT_MSG_NEWSET:
8651                         nft_clear(net, nft_trans_set(trans));
8652                         /* This avoids hitting -EBUSY when deleting the table
8653                          * from the transaction.
8654                          */
8655                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8656                             !list_empty(&nft_trans_set(trans)->bindings))
8657                                 trans->ctx.table->use--;
8658
8659                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8660                                              NFT_MSG_NEWSET, GFP_KERNEL);
8661                         nft_trans_destroy(trans);
8662                         break;
8663                 case NFT_MSG_DELSET:
8664                         list_del_rcu(&nft_trans_set(trans)->list);
8665                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8666                                              NFT_MSG_DELSET, GFP_KERNEL);
8667                         break;
8668                 case NFT_MSG_NEWSETELEM:
8669                         te = (struct nft_trans_elem *)trans->data;
8670
8671                         nft_setelem_activate(net, te->set, &te->elem);
8672                         nf_tables_setelem_notify(&trans->ctx, te->set,
8673                                                  &te->elem,
8674                                                  NFT_MSG_NEWSETELEM);
8675                         nft_trans_destroy(trans);
8676                         break;
8677                 case NFT_MSG_DELSETELEM:
8678                         te = (struct nft_trans_elem *)trans->data;
8679
8680                         nf_tables_setelem_notify(&trans->ctx, te->set,
8681                                                  &te->elem,
8682                                                  NFT_MSG_DELSETELEM);
8683                         nft_setelem_remove(net, te->set, &te->elem);
8684                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8685                                 atomic_dec(&te->set->nelems);
8686                                 te->set->ndeact--;
8687                         }
8688                         break;
8689                 case NFT_MSG_NEWOBJ:
8690                         if (nft_trans_obj_update(trans)) {
8691                                 nft_obj_commit_update(trans);
8692                                 nf_tables_obj_notify(&trans->ctx,
8693                                                      nft_trans_obj(trans),
8694                                                      NFT_MSG_NEWOBJ);
8695                         } else {
8696                                 nft_clear(net, nft_trans_obj(trans));
8697                                 nf_tables_obj_notify(&trans->ctx,
8698                                                      nft_trans_obj(trans),
8699                                                      NFT_MSG_NEWOBJ);
8700                                 nft_trans_destroy(trans);
8701                         }
8702                         break;
8703                 case NFT_MSG_DELOBJ:
8704                         nft_obj_del(nft_trans_obj(trans));
8705                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8706                                              NFT_MSG_DELOBJ);
8707                         break;
8708                 case NFT_MSG_NEWFLOWTABLE:
8709                         if (nft_trans_flowtable_update(trans)) {
8710                                 nft_trans_flowtable(trans)->data.flags =
8711                                         nft_trans_flowtable_flags(trans);
8712                                 nf_tables_flowtable_notify(&trans->ctx,
8713                                                            nft_trans_flowtable(trans),
8714                                                            &nft_trans_flowtable_hooks(trans),
8715                                                            NFT_MSG_NEWFLOWTABLE);
8716                                 list_splice(&nft_trans_flowtable_hooks(trans),
8717                                             &nft_trans_flowtable(trans)->hook_list);
8718                         } else {
8719                                 nft_clear(net, nft_trans_flowtable(trans));
8720                                 nf_tables_flowtable_notify(&trans->ctx,
8721                                                            nft_trans_flowtable(trans),
8722                                                            &nft_trans_flowtable(trans)->hook_list,
8723                                                            NFT_MSG_NEWFLOWTABLE);
8724                         }
8725                         nft_trans_destroy(trans);
8726                         break;
8727                 case NFT_MSG_DELFLOWTABLE:
8728                         if (nft_trans_flowtable_update(trans)) {
8729                                 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8730                                                         &nft_trans_flowtable_hooks(trans));
8731                                 nf_tables_flowtable_notify(&trans->ctx,
8732                                                            nft_trans_flowtable(trans),
8733                                                            &nft_trans_flowtable_hooks(trans),
8734                                                            NFT_MSG_DELFLOWTABLE);
8735                                 nft_unregister_flowtable_net_hooks(net,
8736                                                                    &nft_trans_flowtable_hooks(trans));
8737                         } else {
8738                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8739                                 nf_tables_flowtable_notify(&trans->ctx,
8740                                                            nft_trans_flowtable(trans),
8741                                                            &nft_trans_flowtable(trans)->hook_list,
8742                                                            NFT_MSG_DELFLOWTABLE);
8743                                 nft_unregister_flowtable_net_hooks(net,
8744                                                 &nft_trans_flowtable(trans)->hook_list);
8745                         }
8746                         break;
8747                 }
8748         }
8749
8750         nft_commit_notify(net, NETLINK_CB(skb).portid);
8751         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8752         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8753         nf_tables_commit_release(net);
8754
8755         return 0;
8756 }
8757
8758 static void nf_tables_module_autoload(struct net *net)
8759 {
8760         struct nftables_pernet *nft_net = nft_pernet(net);
8761         struct nft_module_request *req, *next;
8762         LIST_HEAD(module_list);
8763
8764         list_splice_init(&nft_net->module_list, &module_list);
8765         mutex_unlock(&nft_net->commit_mutex);
8766         list_for_each_entry_safe(req, next, &module_list, list) {
8767                 request_module("%s", req->module);
8768                 req->done = true;
8769         }
8770         mutex_lock(&nft_net->commit_mutex);
8771         list_splice(&module_list, &nft_net->module_list);
8772 }
8773
8774 static void nf_tables_abort_release(struct nft_trans *trans)
8775 {
8776         switch (trans->msg_type) {
8777         case NFT_MSG_NEWTABLE:
8778                 nf_tables_table_destroy(&trans->ctx);
8779                 break;
8780         case NFT_MSG_NEWCHAIN:
8781                 nf_tables_chain_destroy(&trans->ctx);
8782                 break;
8783         case NFT_MSG_NEWRULE:
8784                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8785                 break;
8786         case NFT_MSG_NEWSET:
8787                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8788                 break;
8789         case NFT_MSG_NEWSETELEM:
8790                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8791                                      nft_trans_elem(trans).priv, true);
8792                 break;
8793         case NFT_MSG_NEWOBJ:
8794                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8795                 break;
8796         case NFT_MSG_NEWFLOWTABLE:
8797                 if (nft_trans_flowtable_update(trans))
8798                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8799                 else
8800                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8801                 break;
8802         }
8803         kfree(trans);
8804 }
8805
8806 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8807 {
8808         struct nftables_pernet *nft_net = nft_pernet(net);
8809         struct nft_trans *trans, *next;
8810         struct nft_trans_elem *te;
8811         struct nft_hook *hook;
8812
8813         if (action == NFNL_ABORT_VALIDATE &&
8814             nf_tables_validate(net) < 0)
8815                 return -EAGAIN;
8816
8817         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
8818                                          list) {
8819                 switch (trans->msg_type) {
8820                 case NFT_MSG_NEWTABLE:
8821                         if (nft_trans_table_update(trans)) {
8822                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8823                                         nft_trans_destroy(trans);
8824                                         break;
8825                                 }
8826                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
8827                                         nf_tables_table_disable(net, trans->ctx.table);
8828                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8829                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
8830                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
8831                                 }
8832                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8833                                 nft_trans_destroy(trans);
8834                         } else {
8835                                 list_del_rcu(&trans->ctx.table->list);
8836                         }
8837                         break;
8838                 case NFT_MSG_DELTABLE:
8839                         nft_clear(trans->ctx.net, trans->ctx.table);
8840                         nft_trans_destroy(trans);
8841                         break;
8842                 case NFT_MSG_NEWCHAIN:
8843                         if (nft_trans_chain_update(trans)) {
8844                                 free_percpu(nft_trans_chain_stats(trans));
8845                                 kfree(nft_trans_chain_name(trans));
8846                                 nft_trans_destroy(trans);
8847                         } else {
8848                                 if (nft_chain_is_bound(trans->ctx.chain)) {
8849                                         nft_trans_destroy(trans);
8850                                         break;
8851                                 }
8852                                 trans->ctx.table->use--;
8853                                 nft_chain_del(trans->ctx.chain);
8854                                 nf_tables_unregister_hook(trans->ctx.net,
8855                                                           trans->ctx.table,
8856                                                           trans->ctx.chain);
8857                         }
8858                         break;
8859                 case NFT_MSG_DELCHAIN:
8860                         trans->ctx.table->use++;
8861                         nft_clear(trans->ctx.net, trans->ctx.chain);
8862                         nft_trans_destroy(trans);
8863                         break;
8864                 case NFT_MSG_NEWRULE:
8865                         trans->ctx.chain->use--;
8866                         list_del_rcu(&nft_trans_rule(trans)->list);
8867                         nft_rule_expr_deactivate(&trans->ctx,
8868                                                  nft_trans_rule(trans),
8869                                                  NFT_TRANS_ABORT);
8870                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8871                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8872                         break;
8873                 case NFT_MSG_DELRULE:
8874                         trans->ctx.chain->use++;
8875                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8876                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8877                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8878                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8879
8880                         nft_trans_destroy(trans);
8881                         break;
8882                 case NFT_MSG_NEWSET:
8883                         trans->ctx.table->use--;
8884                         if (nft_trans_set_bound(trans)) {
8885                                 nft_trans_destroy(trans);
8886                                 break;
8887                         }
8888                         list_del_rcu(&nft_trans_set(trans)->list);
8889                         break;
8890                 case NFT_MSG_DELSET:
8891                         trans->ctx.table->use++;
8892                         nft_clear(trans->ctx.net, nft_trans_set(trans));
8893                         nft_trans_destroy(trans);
8894                         break;
8895                 case NFT_MSG_NEWSETELEM:
8896                         if (nft_trans_elem_set_bound(trans)) {
8897                                 nft_trans_destroy(trans);
8898                                 break;
8899                         }
8900                         te = (struct nft_trans_elem *)trans->data;
8901                         nft_setelem_remove(net, te->set, &te->elem);
8902                         if (!nft_setelem_is_catchall(te->set, &te->elem))
8903                                 atomic_dec(&te->set->nelems);
8904                         break;
8905                 case NFT_MSG_DELSETELEM:
8906                         te = (struct nft_trans_elem *)trans->data;
8907
8908                         nft_setelem_data_activate(net, te->set, &te->elem);
8909                         nft_setelem_activate(net, te->set, &te->elem);
8910                         if (!nft_setelem_is_catchall(te->set, &te->elem))
8911                                 te->set->ndeact--;
8912
8913                         nft_trans_destroy(trans);
8914                         break;
8915                 case NFT_MSG_NEWOBJ:
8916                         if (nft_trans_obj_update(trans)) {
8917                                 kfree(nft_trans_obj_newobj(trans));
8918                                 nft_trans_destroy(trans);
8919                         } else {
8920                                 trans->ctx.table->use--;
8921                                 nft_obj_del(nft_trans_obj(trans));
8922                         }
8923                         break;
8924                 case NFT_MSG_DELOBJ:
8925                         trans->ctx.table->use++;
8926                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
8927                         nft_trans_destroy(trans);
8928                         break;
8929                 case NFT_MSG_NEWFLOWTABLE:
8930                         if (nft_trans_flowtable_update(trans)) {
8931                                 nft_unregister_flowtable_net_hooks(net,
8932                                                 &nft_trans_flowtable_hooks(trans));
8933                         } else {
8934                                 trans->ctx.table->use--;
8935                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8936                                 nft_unregister_flowtable_net_hooks(net,
8937                                                 &nft_trans_flowtable(trans)->hook_list);
8938                         }
8939                         break;
8940                 case NFT_MSG_DELFLOWTABLE:
8941                         if (nft_trans_flowtable_update(trans)) {
8942                                 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8943                                         hook->inactive = false;
8944                         } else {
8945                                 trans->ctx.table->use++;
8946                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8947                         }
8948                         nft_trans_destroy(trans);
8949                         break;
8950                 }
8951         }
8952
8953         synchronize_rcu();
8954
8955         list_for_each_entry_safe_reverse(trans, next,
8956                                          &nft_net->commit_list, list) {
8957                 list_del(&trans->list);
8958                 nf_tables_abort_release(trans);
8959         }
8960
8961         if (action == NFNL_ABORT_AUTOLOAD)
8962                 nf_tables_module_autoload(net);
8963         else
8964                 nf_tables_module_autoload_cleanup(net);
8965
8966         return 0;
8967 }
8968
8969 static void nf_tables_cleanup(struct net *net)
8970 {
8971         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8972 }
8973
8974 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8975                            enum nfnl_abort_action action)
8976 {
8977         struct nftables_pernet *nft_net = nft_pernet(net);
8978         int ret = __nf_tables_abort(net, action);
8979
8980         mutex_unlock(&nft_net->commit_mutex);
8981
8982         return ret;
8983 }
8984
8985 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8986 {
8987         struct nftables_pernet *nft_net = nft_pernet(net);
8988         bool genid_ok;
8989
8990         mutex_lock(&nft_net->commit_mutex);
8991
8992         genid_ok = genid == 0 || nft_net->base_seq == genid;
8993         if (!genid_ok)
8994                 mutex_unlock(&nft_net->commit_mutex);
8995
8996         /* else, commit mutex has to be released by commit or abort function */
8997         return genid_ok;
8998 }
8999
9000 static const struct nfnetlink_subsystem nf_tables_subsys = {
9001         .name           = "nf_tables",
9002         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9003         .cb_count       = NFT_MSG_MAX,
9004         .cb             = nf_tables_cb,
9005         .commit         = nf_tables_commit,
9006         .abort          = nf_tables_abort,
9007         .cleanup        = nf_tables_cleanup,
9008         .valid_genid    = nf_tables_valid_genid,
9009         .owner          = THIS_MODULE,
9010 };
9011
9012 int nft_chain_validate_dependency(const struct nft_chain *chain,
9013                                   enum nft_chain_types type)
9014 {
9015         const struct nft_base_chain *basechain;
9016
9017         if (nft_is_base_chain(chain)) {
9018                 basechain = nft_base_chain(chain);
9019                 if (basechain->type->type != type)
9020                         return -EOPNOTSUPP;
9021         }
9022         return 0;
9023 }
9024 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9025
9026 int nft_chain_validate_hooks(const struct nft_chain *chain,
9027                              unsigned int hook_flags)
9028 {
9029         struct nft_base_chain *basechain;
9030
9031         if (nft_is_base_chain(chain)) {
9032                 basechain = nft_base_chain(chain);
9033
9034                 if ((1 << basechain->ops.hooknum) & hook_flags)
9035                         return 0;
9036
9037                 return -EOPNOTSUPP;
9038         }
9039
9040         return 0;
9041 }
9042 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9043
9044 /*
9045  * Loop detection - walk through the ruleset beginning at the destination chain
9046  * of a new jump until either the source chain is reached (loop) or all
9047  * reachable chains have been traversed.
9048  *
9049  * The loop check is performed whenever a new jump verdict is added to an
9050  * expression or verdict map or a verdict map is bound to a new chain.
9051  */
9052
9053 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9054                                  const struct nft_chain *chain);
9055
9056 static int nft_check_loops(const struct nft_ctx *ctx,
9057                            const struct nft_set_ext *ext)
9058 {
9059         const struct nft_data *data;
9060         int ret;
9061
9062         data = nft_set_ext_data(ext);
9063         switch (data->verdict.code) {
9064         case NFT_JUMP:
9065         case NFT_GOTO:
9066                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9067                 break;
9068         default:
9069                 ret = 0;
9070                 break;
9071         }
9072
9073         return ret;
9074 }
9075
9076 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9077                                         struct nft_set *set,
9078                                         const struct nft_set_iter *iter,
9079                                         struct nft_set_elem *elem)
9080 {
9081         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9082
9083         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9084             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9085                 return 0;
9086
9087         return nft_check_loops(ctx, ext);
9088 }
9089
9090 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9091                                   struct nft_set *set)
9092 {
9093         u8 genmask = nft_genmask_next(ctx->net);
9094         struct nft_set_elem_catchall *catchall;
9095         struct nft_set_ext *ext;
9096         int ret = 0;
9097
9098         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9099                 ext = nft_set_elem_ext(set, catchall->elem);
9100                 if (!nft_set_elem_active(ext, genmask))
9101                         continue;
9102
9103                 ret = nft_check_loops(ctx, ext);
9104                 if (ret < 0)
9105                         return ret;
9106         }
9107
9108         return ret;
9109 }
9110
9111 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9112                                  const struct nft_chain *chain)
9113 {
9114         const struct nft_rule *rule;
9115         const struct nft_expr *expr, *last;
9116         struct nft_set *set;
9117         struct nft_set_binding *binding;
9118         struct nft_set_iter iter;
9119
9120         if (ctx->chain == chain)
9121                 return -ELOOP;
9122
9123         list_for_each_entry(rule, &chain->rules, list) {
9124                 nft_rule_for_each_expr(expr, last, rule) {
9125                         struct nft_immediate_expr *priv;
9126                         const struct nft_data *data;
9127                         int err;
9128
9129                         if (strcmp(expr->ops->type->name, "immediate"))
9130                                 continue;
9131
9132                         priv = nft_expr_priv(expr);
9133                         if (priv->dreg != NFT_REG_VERDICT)
9134                                 continue;
9135
9136                         data = &priv->data;
9137                         switch (data->verdict.code) {
9138                         case NFT_JUMP:
9139                         case NFT_GOTO:
9140                                 err = nf_tables_check_loops(ctx,
9141                                                         data->verdict.chain);
9142                                 if (err < 0)
9143                                         return err;
9144                                 break;
9145                         default:
9146                                 break;
9147                         }
9148                 }
9149         }
9150
9151         list_for_each_entry(set, &ctx->table->sets, list) {
9152                 if (!nft_is_active_next(ctx->net, set))
9153                         continue;
9154                 if (!(set->flags & NFT_SET_MAP) ||
9155                     set->dtype != NFT_DATA_VERDICT)
9156                         continue;
9157
9158                 list_for_each_entry(binding, &set->bindings, list) {
9159                         if (!(binding->flags & NFT_SET_MAP) ||
9160                             binding->chain != chain)
9161                                 continue;
9162
9163                         iter.genmask    = nft_genmask_next(ctx->net);
9164                         iter.skip       = 0;
9165                         iter.count      = 0;
9166                         iter.err        = 0;
9167                         iter.fn         = nf_tables_loop_check_setelem;
9168
9169                         set->ops->walk(ctx, set, &iter);
9170                         if (!iter.err)
9171                                 iter.err = nft_set_catchall_loops(ctx, set);
9172
9173                         if (iter.err < 0)
9174                                 return iter.err;
9175                 }
9176         }
9177
9178         return 0;
9179 }
9180
9181 /**
9182  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9183  *
9184  *      @attr: netlink attribute to fetch value from
9185  *      @max: maximum value to be stored in dest
9186  *      @dest: pointer to the variable
9187  *
9188  *      Parse, check and store a given u32 netlink attribute into variable.
9189  *      This function returns -ERANGE if the value goes over maximum value.
9190  *      Otherwise a 0 is returned and the attribute value is stored in the
9191  *      destination variable.
9192  */
9193 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9194 {
9195         u32 val;
9196
9197         val = ntohl(nla_get_be32(attr));
9198         if (val > max)
9199                 return -ERANGE;
9200
9201         *dest = val;
9202         return 0;
9203 }
9204 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9205
9206 static unsigned int nft_parse_register(const struct nlattr *attr)
9207 {
9208         unsigned int reg;
9209
9210         reg = ntohl(nla_get_be32(attr));
9211         switch (reg) {
9212         case NFT_REG_VERDICT...NFT_REG_4:
9213                 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9214         default:
9215                 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9216         }
9217 }
9218
9219 /**
9220  *      nft_dump_register - dump a register value to a netlink attribute
9221  *
9222  *      @skb: socket buffer
9223  *      @attr: attribute number
9224  *      @reg: register number
9225  *
9226  *      Construct a netlink attribute containing the register number. For
9227  *      compatibility reasons, register numbers being a multiple of 4 are
9228  *      translated to the corresponding 128 bit register numbers.
9229  */
9230 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9231 {
9232         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9233                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9234         else
9235                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9236
9237         return nla_put_be32(skb, attr, htonl(reg));
9238 }
9239 EXPORT_SYMBOL_GPL(nft_dump_register);
9240
9241 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9242 {
9243         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9244                 return -EINVAL;
9245         if (len == 0)
9246                 return -EINVAL;
9247         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9248                 return -ERANGE;
9249
9250         return 0;
9251 }
9252
9253 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9254 {
9255         u32 reg;
9256         int err;
9257
9258         reg = nft_parse_register(attr);
9259         err = nft_validate_register_load(reg, len);
9260         if (err < 0)
9261                 return err;
9262
9263         *sreg = reg;
9264         return 0;
9265 }
9266 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9267
9268 static int nft_validate_register_store(const struct nft_ctx *ctx,
9269                                        enum nft_registers reg,
9270                                        const struct nft_data *data,
9271                                        enum nft_data_types type,
9272                                        unsigned int len)
9273 {
9274         int err;
9275
9276         switch (reg) {
9277         case NFT_REG_VERDICT:
9278                 if (type != NFT_DATA_VERDICT)
9279                         return -EINVAL;
9280
9281                 if (data != NULL &&
9282                     (data->verdict.code == NFT_GOTO ||
9283                      data->verdict.code == NFT_JUMP)) {
9284                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9285                         if (err < 0)
9286                                 return err;
9287                 }
9288
9289                 return 0;
9290         default:
9291                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9292                         return -EINVAL;
9293                 if (len == 0)
9294                         return -EINVAL;
9295                 if (reg * NFT_REG32_SIZE + len >
9296                     sizeof_field(struct nft_regs, data))
9297                         return -ERANGE;
9298
9299                 if (data != NULL && type != NFT_DATA_VALUE)
9300                         return -EINVAL;
9301                 return 0;
9302         }
9303 }
9304
9305 int nft_parse_register_store(const struct nft_ctx *ctx,
9306                              const struct nlattr *attr, u8 *dreg,
9307                              const struct nft_data *data,
9308                              enum nft_data_types type, unsigned int len)
9309 {
9310         int err;
9311         u32 reg;
9312
9313         reg = nft_parse_register(attr);
9314         err = nft_validate_register_store(ctx, reg, data, type, len);
9315         if (err < 0)
9316                 return err;
9317
9318         *dreg = reg;
9319         return 0;
9320 }
9321 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9322
9323 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9324         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9325         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9326                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9327         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9328 };
9329
9330 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9331                             struct nft_data_desc *desc, const struct nlattr *nla)
9332 {
9333         u8 genmask = nft_genmask_next(ctx->net);
9334         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9335         struct nft_chain *chain;
9336         int err;
9337
9338         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9339                                           nft_verdict_policy, NULL);
9340         if (err < 0)
9341                 return err;
9342
9343         if (!tb[NFTA_VERDICT_CODE])
9344                 return -EINVAL;
9345         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9346
9347         switch (data->verdict.code) {
9348         default:
9349                 switch (data->verdict.code & NF_VERDICT_MASK) {
9350                 case NF_ACCEPT:
9351                 case NF_DROP:
9352                 case NF_QUEUE:
9353                         break;
9354                 default:
9355                         return -EINVAL;
9356                 }
9357                 fallthrough;
9358         case NFT_CONTINUE:
9359         case NFT_BREAK:
9360         case NFT_RETURN:
9361                 break;
9362         case NFT_JUMP:
9363         case NFT_GOTO:
9364                 if (tb[NFTA_VERDICT_CHAIN]) {
9365                         chain = nft_chain_lookup(ctx->net, ctx->table,
9366                                                  tb[NFTA_VERDICT_CHAIN],
9367                                                  genmask);
9368                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9369                         chain = nft_chain_lookup_byid(ctx->net,
9370                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9371                         if (IS_ERR(chain))
9372                                 return PTR_ERR(chain);
9373                 } else {
9374                         return -EINVAL;
9375                 }
9376
9377                 if (IS_ERR(chain))
9378                         return PTR_ERR(chain);
9379                 if (nft_is_base_chain(chain))
9380                         return -EOPNOTSUPP;
9381
9382                 chain->use++;
9383                 data->verdict.chain = chain;
9384                 break;
9385         }
9386
9387         desc->len = sizeof(data->verdict);
9388         desc->type = NFT_DATA_VERDICT;
9389         return 0;
9390 }
9391
9392 static void nft_verdict_uninit(const struct nft_data *data)
9393 {
9394         struct nft_chain *chain;
9395         struct nft_rule *rule;
9396
9397         switch (data->verdict.code) {
9398         case NFT_JUMP:
9399         case NFT_GOTO:
9400                 chain = data->verdict.chain;
9401                 chain->use--;
9402
9403                 if (!nft_chain_is_bound(chain))
9404                         break;
9405
9406                 chain->table->use--;
9407                 list_for_each_entry(rule, &chain->rules, list)
9408                         chain->use--;
9409
9410                 nft_chain_del(chain);
9411                 break;
9412         }
9413 }
9414
9415 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9416 {
9417         struct nlattr *nest;
9418
9419         nest = nla_nest_start_noflag(skb, type);
9420         if (!nest)
9421                 goto nla_put_failure;
9422
9423         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9424                 goto nla_put_failure;
9425
9426         switch (v->code) {
9427         case NFT_JUMP:
9428         case NFT_GOTO:
9429                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9430                                    v->chain->name))
9431                         goto nla_put_failure;
9432         }
9433         nla_nest_end(skb, nest);
9434         return 0;
9435
9436 nla_put_failure:
9437         return -1;
9438 }
9439
9440 static int nft_value_init(const struct nft_ctx *ctx,
9441                           struct nft_data *data, unsigned int size,
9442                           struct nft_data_desc *desc, const struct nlattr *nla)
9443 {
9444         unsigned int len;
9445
9446         len = nla_len(nla);
9447         if (len == 0)
9448                 return -EINVAL;
9449         if (len > size)
9450                 return -EOVERFLOW;
9451
9452         nla_memcpy(data->data, nla, len);
9453         desc->type = NFT_DATA_VALUE;
9454         desc->len  = len;
9455         return 0;
9456 }
9457
9458 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9459                           unsigned int len)
9460 {
9461         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9462 }
9463
9464 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9465         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9466         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9467 };
9468
9469 /**
9470  *      nft_data_init - parse nf_tables data netlink attributes
9471  *
9472  *      @ctx: context of the expression using the data
9473  *      @data: destination struct nft_data
9474  *      @size: maximum data length
9475  *      @desc: data description
9476  *      @nla: netlink attribute containing data
9477  *
9478  *      Parse the netlink data attributes and initialize a struct nft_data.
9479  *      The type and length of data are returned in the data description.
9480  *
9481  *      The caller can indicate that it only wants to accept data of type
9482  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9483  */
9484 int nft_data_init(const struct nft_ctx *ctx,
9485                   struct nft_data *data, unsigned int size,
9486                   struct nft_data_desc *desc, const struct nlattr *nla)
9487 {
9488         struct nlattr *tb[NFTA_DATA_MAX + 1];
9489         int err;
9490
9491         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9492                                           nft_data_policy, NULL);
9493         if (err < 0)
9494                 return err;
9495
9496         if (tb[NFTA_DATA_VALUE])
9497                 return nft_value_init(ctx, data, size, desc,
9498                                       tb[NFTA_DATA_VALUE]);
9499         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9500                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9501         return -EINVAL;
9502 }
9503 EXPORT_SYMBOL_GPL(nft_data_init);
9504
9505 /**
9506  *      nft_data_release - release a nft_data item
9507  *
9508  *      @data: struct nft_data to release
9509  *      @type: type of data
9510  *
9511  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9512  *      all others need to be released by calling this function.
9513  */
9514 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9515 {
9516         if (type < NFT_DATA_VERDICT)
9517                 return;
9518         switch (type) {
9519         case NFT_DATA_VERDICT:
9520                 return nft_verdict_uninit(data);
9521         default:
9522                 WARN_ON(1);
9523         }
9524 }
9525 EXPORT_SYMBOL_GPL(nft_data_release);
9526
9527 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9528                   enum nft_data_types type, unsigned int len)
9529 {
9530         struct nlattr *nest;
9531         int err;
9532
9533         nest = nla_nest_start_noflag(skb, attr);
9534         if (nest == NULL)
9535                 return -1;
9536
9537         switch (type) {
9538         case NFT_DATA_VALUE:
9539                 err = nft_value_dump(skb, data, len);
9540                 break;
9541         case NFT_DATA_VERDICT:
9542                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9543                 break;
9544         default:
9545                 err = -EINVAL;
9546                 WARN_ON(1);
9547         }
9548
9549         nla_nest_end(skb, nest);
9550         return err;
9551 }
9552 EXPORT_SYMBOL_GPL(nft_data_dump);
9553
9554 int __nft_release_basechain(struct nft_ctx *ctx)
9555 {
9556         struct nft_rule *rule, *nr;
9557
9558         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9559                 return 0;
9560
9561         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9562         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9563                 list_del(&rule->list);
9564                 ctx->chain->use--;
9565                 nf_tables_rule_release(ctx, rule);
9566         }
9567         nft_chain_del(ctx->chain);
9568         ctx->table->use--;
9569         nf_tables_chain_destroy(ctx);
9570
9571         return 0;
9572 }
9573 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9574
9575 static void __nft_release_hook(struct net *net, struct nft_table *table)
9576 {
9577         struct nft_chain *chain;
9578
9579         list_for_each_entry(chain, &table->chains, list)
9580                 nf_tables_unregister_hook(net, table, chain);
9581 }
9582
9583 static void __nft_release_hooks(struct net *net)
9584 {
9585         struct nftables_pernet *nft_net = nft_pernet(net);
9586         struct nft_table *table;
9587
9588         list_for_each_entry(table, &nft_net->tables, list) {
9589                 if (nft_table_has_owner(table))
9590                         continue;
9591
9592                 __nft_release_hook(net, table);
9593         }
9594 }
9595
9596 static void __nft_release_table(struct net *net, struct nft_table *table)
9597 {
9598         struct nft_flowtable *flowtable, *nf;
9599         struct nft_chain *chain, *nc;
9600         struct nft_object *obj, *ne;
9601         struct nft_rule *rule, *nr;
9602         struct nft_set *set, *ns;
9603         struct nft_ctx ctx = {
9604                 .net    = net,
9605                 .family = NFPROTO_NETDEV,
9606         };
9607
9608         ctx.family = table->family;
9609         ctx.table = table;
9610         list_for_each_entry(chain, &table->chains, list) {
9611                 ctx.chain = chain;
9612                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9613                         list_del(&rule->list);
9614                         chain->use--;
9615                         nf_tables_rule_release(&ctx, rule);
9616                 }
9617         }
9618         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9619                 list_del(&flowtable->list);
9620                 table->use--;
9621                 nf_tables_flowtable_destroy(flowtable);
9622         }
9623         list_for_each_entry_safe(set, ns, &table->sets, list) {
9624                 list_del(&set->list);
9625                 table->use--;
9626                 nft_set_destroy(&ctx, set);
9627         }
9628         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9629                 nft_obj_del(obj);
9630                 table->use--;
9631                 nft_obj_destroy(&ctx, obj);
9632         }
9633         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9634                 ctx.chain = chain;
9635                 nft_chain_del(chain);
9636                 table->use--;
9637                 nf_tables_chain_destroy(&ctx);
9638         }
9639         nf_tables_table_destroy(&ctx);
9640 }
9641
9642 static void __nft_release_tables(struct net *net)
9643 {
9644         struct nftables_pernet *nft_net = nft_pernet(net);
9645         struct nft_table *table, *nt;
9646
9647         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9648                 if (nft_table_has_owner(table))
9649                         continue;
9650
9651                 list_del(&table->list);
9652
9653                 __nft_release_table(net, table);
9654         }
9655 }
9656
9657 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9658                             void *ptr)
9659 {
9660         struct nft_table *table, *to_delete[8];
9661         struct nftables_pernet *nft_net;
9662         struct netlink_notify *n = ptr;
9663         struct net *net = n->net;
9664         unsigned int deleted;
9665         bool restart = false;
9666
9667         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9668                 return NOTIFY_DONE;
9669
9670         nft_net = nft_pernet(net);
9671         deleted = 0;
9672         mutex_lock(&nft_net->commit_mutex);
9673 again:
9674         list_for_each_entry(table, &nft_net->tables, list) {
9675                 if (nft_table_has_owner(table) &&
9676                     n->portid == table->nlpid) {
9677                         __nft_release_hook(net, table);
9678                         list_del_rcu(&table->list);
9679                         to_delete[deleted++] = table;
9680                         if (deleted >= ARRAY_SIZE(to_delete))
9681                                 break;
9682                 }
9683         }
9684         if (deleted) {
9685                 restart = deleted >= ARRAY_SIZE(to_delete);
9686                 synchronize_rcu();
9687                 while (deleted)
9688                         __nft_release_table(net, to_delete[--deleted]);
9689
9690                 if (restart)
9691                         goto again;
9692         }
9693         mutex_unlock(&nft_net->commit_mutex);
9694
9695         return NOTIFY_DONE;
9696 }
9697
9698 static struct notifier_block nft_nl_notifier = {
9699         .notifier_call  = nft_rcv_nl_event,
9700 };
9701
9702 static int __net_init nf_tables_init_net(struct net *net)
9703 {
9704         struct nftables_pernet *nft_net = nft_pernet(net);
9705
9706         INIT_LIST_HEAD(&nft_net->tables);
9707         INIT_LIST_HEAD(&nft_net->commit_list);
9708         INIT_LIST_HEAD(&nft_net->module_list);
9709         INIT_LIST_HEAD(&nft_net->notify_list);
9710         mutex_init(&nft_net->commit_mutex);
9711         nft_net->base_seq = 1;
9712         nft_net->validate_state = NFT_VALIDATE_SKIP;
9713
9714         return 0;
9715 }
9716
9717 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9718 {
9719         __nft_release_hooks(net);
9720 }
9721
9722 static void __net_exit nf_tables_exit_net(struct net *net)
9723 {
9724         struct nftables_pernet *nft_net = nft_pernet(net);
9725
9726         mutex_lock(&nft_net->commit_mutex);
9727         if (!list_empty(&nft_net->commit_list))
9728                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9729         __nft_release_tables(net);
9730         mutex_unlock(&nft_net->commit_mutex);
9731         WARN_ON_ONCE(!list_empty(&nft_net->tables));
9732         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9733         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9734 }
9735
9736 static struct pernet_operations nf_tables_net_ops = {
9737         .init           = nf_tables_init_net,
9738         .pre_exit       = nf_tables_pre_exit_net,
9739         .exit           = nf_tables_exit_net,
9740         .id             = &nf_tables_net_id,
9741         .size           = sizeof(struct nftables_pernet),
9742 };
9743
9744 static int __init nf_tables_module_init(void)
9745 {
9746         int err;
9747
9748         err = register_pernet_subsys(&nf_tables_net_ops);
9749         if (err < 0)
9750                 return err;
9751
9752         err = nft_chain_filter_init();
9753         if (err < 0)
9754                 goto err_chain_filter;
9755
9756         err = nf_tables_core_module_init();
9757         if (err < 0)
9758                 goto err_core_module;
9759
9760         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9761         if (err < 0)
9762                 goto err_netdev_notifier;
9763
9764         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9765         if (err < 0)
9766                 goto err_rht_objname;
9767
9768         err = nft_offload_init();
9769         if (err < 0)
9770                 goto err_offload;
9771
9772         err = netlink_register_notifier(&nft_nl_notifier);
9773         if (err < 0)
9774                 goto err_netlink_notifier;
9775
9776         /* must be last */
9777         err = nfnetlink_subsys_register(&nf_tables_subsys);
9778         if (err < 0)
9779                 goto err_nfnl_subsys;
9780
9781         nft_chain_route_init();
9782
9783         return err;
9784
9785 err_nfnl_subsys:
9786         netlink_unregister_notifier(&nft_nl_notifier);
9787 err_netlink_notifier:
9788         nft_offload_exit();
9789 err_offload:
9790         rhltable_destroy(&nft_objname_ht);
9791 err_rht_objname:
9792         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9793 err_netdev_notifier:
9794         nf_tables_core_module_exit();
9795 err_core_module:
9796         nft_chain_filter_fini();
9797 err_chain_filter:
9798         unregister_pernet_subsys(&nf_tables_net_ops);
9799         return err;
9800 }
9801
9802 static void __exit nf_tables_module_exit(void)
9803 {
9804         nfnetlink_subsys_unregister(&nf_tables_subsys);
9805         netlink_unregister_notifier(&nft_nl_notifier);
9806         nft_offload_exit();
9807         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9808         nft_chain_filter_fini();
9809         nft_chain_route_fini();
9810         unregister_pernet_subsys(&nf_tables_net_ops);
9811         cancel_work_sync(&trans_destroy_work);
9812         rcu_barrier();
9813         rhltable_destroy(&nft_objname_ht);
9814         nf_tables_core_module_exit();
9815 }
9816
9817 module_init(nf_tables_module_init);
9818 module_exit(nf_tables_module_exit);
9819
9820 MODULE_LICENSE("GPL");
9821 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9822 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);