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