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 #define NFT_SET_MAX_ANONLEN 16
  28
  29 unsigned int nf_tables_net_id __read_mostly;
  30
  31 static LIST_HEAD(nf_tables_expressions);
  32 static LIST_HEAD(nf_tables_objects);
  33 static LIST_HEAD(nf_tables_flowtables);
  34 static LIST_HEAD(nf_tables_destroy_list);
  35 static LIST_HEAD(nf_tables_gc_list);
  36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
  38
  39 enum {
  40         NFT_VALIDATE_SKIP       = 0,
  41         NFT_VALIDATE_NEED,
  42         NFT_VALIDATE_DO,
  43 };
  44
  45 static struct rhltable nft_objname_ht;
  46
  47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  50
  51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  54
  55 static const struct rhashtable_params nft_chain_ht_params = {
  56         .head_offset            = offsetof(struct nft_chain, rhlhead),
  57         .key_offset             = offsetof(struct nft_chain, name),
  58         .hashfn                 = nft_chain_hash,
  59         .obj_hashfn             = nft_chain_hash_obj,
  60         .obj_cmpfn              = nft_chain_hash_cmp,
  61         .automatic_shrinking    = true,
  62 };
  63
  64 static const struct rhashtable_params nft_objname_ht_params = {
  65         .head_offset            = offsetof(struct nft_object, rhlhead),
  66         .key_offset             = offsetof(struct nft_object, key),
  67         .hashfn                 = nft_objname_hash,
  68         .obj_hashfn             = nft_objname_hash_obj,
  69         .obj_cmpfn              = nft_objname_hash_cmp,
  70         .automatic_shrinking    = true,
  71 };
  72
  73 struct nft_audit_data {
  74         struct nft_table *table;
  75         int entries;
  76         int op;
  77         struct list_head list;
  78 };
  79
  80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  81         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  82         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  84         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  85         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  87         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  88         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  90         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  91         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  93         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  94         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  96         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  97         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
 100         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
 101         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 102         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 103         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 104         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 105         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 106         [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
 107 };
 108
 109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 110 {
 111         switch (table->validate_state) {
 112         case NFT_VALIDATE_SKIP:
 113                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 114                 break;
 115         case NFT_VALIDATE_NEED:
 116                 break;
 117         case NFT_VALIDATE_DO:
 118                 if (new_validate_state == NFT_VALIDATE_NEED)
 119                         return;
 120         }
 121
 122         table->validate_state = new_validate_state;
 123 }
 124 static void nf_tables_trans_destroy_work(struct work_struct *w);
 125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 126
 127 static void nft_trans_gc_work(struct work_struct *work);
 128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
 129
 130 static void nft_ctx_init(struct nft_ctx *ctx,
 131                          struct net *net,
 132                          const struct sk_buff *skb,
 133                          const struct nlmsghdr *nlh,
 134                          u8 family,
 135                          struct nft_table *table,
 136                          struct nft_chain *chain,
 137                          const struct nlattr * const *nla)
 138 {
 139         ctx->net        = net;
 140         ctx->family     = family;
 141         ctx->level      = 0;
 142         ctx->table      = table;
 143         ctx->chain      = chain;
 144         ctx->nla        = nla;
 145         ctx->portid     = NETLINK_CB(skb).portid;
 146         ctx->report     = nlmsg_report(nlh);
 147         ctx->flags      = nlh->nlmsg_flags;
 148         ctx->seq        = nlh->nlmsg_seq;
 149 }
 150
 151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 152                                              int msg_type, u32 size, gfp_t gfp)
 153 {
 154         struct nft_trans *trans;
 155
 156         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 157         if (trans == NULL)
 158                 return NULL;
 159
 160         INIT_LIST_HEAD(&trans->list);
 161         INIT_LIST_HEAD(&trans->binding_list);
 162         trans->msg_type = msg_type;
 163         trans->ctx      = *ctx;
 164
 165         return trans;
 166 }
 167
 168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 169                                          int msg_type, u32 size)
 170 {
 171         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 172 }
 173
 174 static void nft_trans_list_del(struct nft_trans *trans)
 175 {
 176         list_del(&trans->list);
 177         list_del(&trans->binding_list);
 178 }
 179
 180 static void nft_trans_destroy(struct nft_trans *trans)
 181 {
 182         nft_trans_list_del(trans);
 183         kfree(trans);
 184 }
 185
 186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 187                                  bool bind)
 188 {
 189         struct nftables_pernet *nft_net;
 190         struct net *net = ctx->net;
 191         struct nft_trans *trans;
 192
 193         if (!nft_set_is_anonymous(set))
 194                 return;
 195
 196         nft_net = nft_pernet(net);
 197         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 198                 switch (trans->msg_type) {
 199                 case NFT_MSG_NEWSET:
 200                         if (nft_trans_set(trans) == set)
 201                                 nft_trans_set_bound(trans) = bind;
 202                         break;
 203                 case NFT_MSG_NEWSETELEM:
 204                         if (nft_trans_elem_set(trans) == set)
 205                                 nft_trans_elem_set_bound(trans) = bind;
 206                         break;
 207                 }
 208         }
 209 }
 210
 211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 212 {
 213         return __nft_set_trans_bind(ctx, set, true);
 214 }
 215
 216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 217 {
 218         return __nft_set_trans_bind(ctx, set, false);
 219 }
 220
 221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 222                                    struct nft_chain *chain, bool bind)
 223 {
 224         struct nftables_pernet *nft_net;
 225         struct net *net = ctx->net;
 226         struct nft_trans *trans;
 227
 228         if (!nft_chain_binding(chain))
 229                 return;
 230
 231         nft_net = nft_pernet(net);
 232         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 233                 switch (trans->msg_type) {
 234                 case NFT_MSG_NEWCHAIN:
 235                         if (nft_trans_chain(trans) == chain)
 236                                 nft_trans_chain_bound(trans) = bind;
 237                         break;
 238                 case NFT_MSG_NEWRULE:
 239                         if (trans->ctx.chain == chain)
 240                                 nft_trans_rule_bound(trans) = bind;
 241                         break;
 242                 }
 243         }
 244 }
 245
 246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 247                                  struct nft_chain *chain)
 248 {
 249         __nft_chain_trans_bind(ctx, chain, true);
 250 }
 251
 252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 253 {
 254         if (!nft_chain_binding(chain))
 255                 return 0;
 256
 257         if (nft_chain_binding(ctx->chain))
 258                 return -EOPNOTSUPP;
 259
 260         if (chain->bound)
 261                 return -EBUSY;
 262
 263         if (!nft_use_inc(&chain->use))
 264                 return -EMFILE;
 265
 266         chain->bound = true;
 267         nft_chain_trans_bind(ctx, chain);
 268
 269         return 0;
 270 }
 271
 272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 273 {
 274         __nft_chain_trans_bind(ctx, chain, false);
 275 }
 276
 277 static int nft_netdev_register_hooks(struct net *net,
 278                                      struct list_head *hook_list)
 279 {
 280         struct nft_hook *hook;
 281         int err, j;
 282
 283         j = 0;
 284         list_for_each_entry(hook, hook_list, list) {
 285                 err = nf_register_net_hook(net, &hook->ops);
 286                 if (err < 0)
 287                         goto err_register;
 288
 289                 j++;
 290         }
 291         return 0;
 292
 293 err_register:
 294         list_for_each_entry(hook, hook_list, list) {
 295                 if (j-- <= 0)
 296                         break;
 297
 298                 nf_unregister_net_hook(net, &hook->ops);
 299         }
 300         return err;
 301 }
 302
 303 static void nft_netdev_unregister_hooks(struct net *net,
 304                                         struct list_head *hook_list,
 305                                         bool release_netdev)
 306 {
 307         struct nft_hook *hook, *next;
 308
 309         list_for_each_entry_safe(hook, next, hook_list, list) {
 310                 nf_unregister_net_hook(net, &hook->ops);
 311                 if (release_netdev) {
 312                         list_del(&hook->list);
 313                         kfree_rcu(hook, rcu);
 314                 }
 315         }
 316 }
 317
 318 static int nf_tables_register_hook(struct net *net,
 319                                    const struct nft_table *table,
 320                                    struct nft_chain *chain)
 321 {
 322         struct nft_base_chain *basechain;
 323         const struct nf_hook_ops *ops;
 324
 325         if (table->flags & NFT_TABLE_F_DORMANT ||
 326             !nft_is_base_chain(chain))
 327                 return 0;
 328
 329         basechain = nft_base_chain(chain);
 330         ops = &basechain->ops;
 331
 332         if (basechain->type->ops_register)
 333                 return basechain->type->ops_register(net, ops);
 334
 335         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 336                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 337
 338         return nf_register_net_hook(net, &basechain->ops);
 339 }
 340
 341 static void __nf_tables_unregister_hook(struct net *net,
 342                                         const struct nft_table *table,
 343                                         struct nft_chain *chain,
 344                                         bool release_netdev)
 345 {
 346         struct nft_base_chain *basechain;
 347         const struct nf_hook_ops *ops;
 348
 349         if (table->flags & NFT_TABLE_F_DORMANT ||
 350             !nft_is_base_chain(chain))
 351                 return;
 352         basechain = nft_base_chain(chain);
 353         ops = &basechain->ops;
 354
 355         if (basechain->type->ops_unregister)
 356                 return basechain->type->ops_unregister(net, ops);
 357
 358         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 359                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 360                                             release_netdev);
 361         else
 362                 nf_unregister_net_hook(net, &basechain->ops);
 363 }
 364
 365 static void nf_tables_unregister_hook(struct net *net,
 366                                       const struct nft_table *table,
 367                                       struct nft_chain *chain)
 368 {
 369         return __nf_tables_unregister_hook(net, table, chain, false);
 370 }
 371
 372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 373 {
 374         struct nftables_pernet *nft_net = nft_pernet(net);
 375
 376         switch (trans->msg_type) {
 377         case NFT_MSG_NEWSET:
 378                 if (!nft_trans_set_update(trans) &&
 379                     nft_set_is_anonymous(nft_trans_set(trans)))
 380                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 381                 break;
 382         case NFT_MSG_NEWCHAIN:
 383                 if (!nft_trans_chain_update(trans) &&
 384                     nft_chain_binding(nft_trans_chain(trans)))
 385                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 386                 break;
 387         }
 388
 389         list_add_tail(&trans->list, &nft_net->commit_list);
 390 }
 391
 392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 393 {
 394         struct nft_trans *trans;
 395
 396         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 397         if (trans == NULL)
 398                 return -ENOMEM;
 399
 400         if (msg_type == NFT_MSG_NEWTABLE)
 401                 nft_activate_next(ctx->net, ctx->table);
 402
 403         nft_trans_commit_list_add_tail(ctx->net, trans);
 404         return 0;
 405 }
 406
 407 static int nft_deltable(struct nft_ctx *ctx)
 408 {
 409         int err;
 410
 411         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 412         if (err < 0)
 413                 return err;
 414
 415         nft_deactivate_next(ctx->net, ctx->table);
 416         return err;
 417 }
 418
 419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 420 {
 421         struct nft_trans *trans;
 422
 423         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 424         if (trans == NULL)
 425                 return ERR_PTR(-ENOMEM);
 426
 427         if (msg_type == NFT_MSG_NEWCHAIN) {
 428                 nft_activate_next(ctx->net, ctx->chain);
 429
 430                 if (ctx->nla[NFTA_CHAIN_ID]) {
 431                         nft_trans_chain_id(trans) =
 432                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 433                 }
 434         }
 435         nft_trans_chain(trans) = ctx->chain;
 436         nft_trans_commit_list_add_tail(ctx->net, trans);
 437
 438         return trans;
 439 }
 440
 441 static int nft_delchain(struct nft_ctx *ctx)
 442 {
 443         struct nft_trans *trans;
 444
 445         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 446         if (IS_ERR(trans))
 447                 return PTR_ERR(trans);
 448
 449         nft_use_dec(&ctx->table->use);
 450         nft_deactivate_next(ctx->net, ctx->chain);
 451
 452         return 0;
 453 }
 454
 455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 456 {
 457         struct nft_expr *expr;
 458
 459         expr = nft_expr_first(rule);
 460         while (nft_expr_more(rule, expr)) {
 461                 if (expr->ops->activate)
 462                         expr->ops->activate(ctx, expr);
 463
 464                 expr = nft_expr_next(expr);
 465         }
 466 }
 467
 468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 469                               enum nft_trans_phase phase)
 470 {
 471         struct nft_expr *expr;
 472
 473         expr = nft_expr_first(rule);
 474         while (nft_expr_more(rule, expr)) {
 475                 if (expr->ops->deactivate)
 476                         expr->ops->deactivate(ctx, expr, phase);
 477
 478                 expr = nft_expr_next(expr);
 479         }
 480 }
 481
 482 static int
 483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 484 {
 485         /* You cannot delete the same rule twice */
 486         if (nft_is_active_next(ctx->net, rule)) {
 487                 nft_deactivate_next(ctx->net, rule);
 488                 nft_use_dec(&ctx->chain->use);
 489                 return 0;
 490         }
 491         return -ENOENT;
 492 }
 493
 494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 495                                             struct nft_rule *rule)
 496 {
 497         struct nft_trans *trans;
 498
 499         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 500         if (trans == NULL)
 501                 return NULL;
 502
 503         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 504                 nft_trans_rule_id(trans) =
 505                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 506         }
 507         nft_trans_rule(trans) = rule;
 508         nft_trans_commit_list_add_tail(ctx->net, trans);
 509
 510         return trans;
 511 }
 512
 513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 514 {
 515         struct nft_flow_rule *flow;
 516         struct nft_trans *trans;
 517         int err;
 518
 519         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 520         if (trans == NULL)
 521                 return -ENOMEM;
 522
 523         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 524                 flow = nft_flow_rule_create(ctx->net, rule);
 525                 if (IS_ERR(flow)) {
 526                         nft_trans_destroy(trans);
 527                         return PTR_ERR(flow);
 528                 }
 529
 530                 nft_trans_flow_rule(trans) = flow;
 531         }
 532
 533         err = nf_tables_delrule_deactivate(ctx, rule);
 534         if (err < 0) {
 535                 nft_trans_destroy(trans);
 536                 return err;
 537         }
 538         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 539
 540         return 0;
 541 }
 542
 543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 544 {
 545         struct nft_rule *rule;
 546         int err;
 547
 548         list_for_each_entry(rule, &ctx->chain->rules, list) {
 549                 if (!nft_is_active_next(ctx->net, rule))
 550                         continue;
 551
 552                 err = nft_delrule(ctx, rule);
 553                 if (err < 0)
 554                         return err;
 555         }
 556         return 0;
 557 }
 558
 559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 560                                struct nft_set *set,
 561                                const struct nft_set_desc *desc)
 562 {
 563         struct nft_trans *trans;
 564
 565         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 566         if (trans == NULL)
 567                 return -ENOMEM;
 568
 569         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 570                 nft_trans_set_id(trans) =
 571                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 572                 nft_activate_next(ctx->net, set);
 573         }
 574         nft_trans_set(trans) = set;
 575         if (desc) {
 576                 nft_trans_set_update(trans) = true;
 577                 nft_trans_set_gc_int(trans) = desc->gc_int;
 578                 nft_trans_set_timeout(trans) = desc->timeout;
 579                 nft_trans_set_size(trans) = desc->size;
 580         }
 581         nft_trans_commit_list_add_tail(ctx->net, trans);
 582
 583         return 0;
 584 }
 585
 586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 587                              struct nft_set *set)
 588 {
 589         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 590 }
 591
 592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 593                                   struct nft_set *set,
 594                                   const struct nft_set_iter *iter,
 595                                   struct nft_elem_priv *elem_priv)
 596 {
 597         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
 598
 599         return 0;
 600 }
 601
 602 struct nft_set_elem_catchall {
 603         struct list_head        list;
 604         struct rcu_head         rcu;
 605         struct nft_elem_priv    *elem;
 606 };
 607
 608 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 609                                         struct nft_set *set)
 610 {
 611         u8 genmask = nft_genmask_next(ctx->net);
 612         struct nft_set_elem_catchall *catchall;
 613         struct nft_set_ext *ext;
 614
 615         list_for_each_entry(catchall, &set->catchall_list, list) {
 616                 ext = nft_set_elem_ext(set, catchall->elem);
 617                 if (!nft_set_elem_active(ext, genmask))
 618                         continue;
 619
 620                 nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
 621                 break;
 622         }
 623 }
 624
 625 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 626 {
 627         struct nft_set_iter iter = {
 628                 .genmask        = nft_genmask_next(ctx->net),
 629                 .fn             = nft_mapelem_deactivate,
 630         };
 631
 632         set->ops->walk(ctx, set, &iter);
 633         WARN_ON_ONCE(iter.err);
 634
 635         nft_map_catchall_deactivate(ctx, set);
 636 }
 637
 638 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 639 {
 640         int err;
 641
 642         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 643         if (err < 0)
 644                 return err;
 645
 646         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 647                 nft_map_deactivate(ctx, set);
 648
 649         nft_deactivate_next(ctx->net, set);
 650         nft_use_dec(&ctx->table->use);
 651
 652         return err;
 653 }
 654
 655 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 656                              struct nft_object *obj)
 657 {
 658         struct nft_trans *trans;
 659
 660         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 661         if (trans == NULL)
 662                 return -ENOMEM;
 663
 664         if (msg_type == NFT_MSG_NEWOBJ)
 665                 nft_activate_next(ctx->net, obj);
 666
 667         nft_trans_obj(trans) = obj;
 668         nft_trans_commit_list_add_tail(ctx->net, trans);
 669
 670         return 0;
 671 }
 672
 673 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 674 {
 675         int err;
 676
 677         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 678         if (err < 0)
 679                 return err;
 680
 681         nft_deactivate_next(ctx->net, obj);
 682         nft_use_dec(&ctx->table->use);
 683
 684         return err;
 685 }
 686
 687 static struct nft_trans *
 688 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 689                         struct nft_flowtable *flowtable)
 690 {
 691         struct nft_trans *trans;
 692
 693         trans = nft_trans_alloc(ctx, msg_type,
 694                                 sizeof(struct nft_trans_flowtable));
 695         if (trans == NULL)
 696                 return ERR_PTR(-ENOMEM);
 697
 698         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 699                 nft_activate_next(ctx->net, flowtable);
 700
 701         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 702         nft_trans_flowtable(trans) = flowtable;
 703         nft_trans_commit_list_add_tail(ctx->net, trans);
 704
 705         return trans;
 706 }
 707
 708 static int nft_delflowtable(struct nft_ctx *ctx,
 709                             struct nft_flowtable *flowtable)
 710 {
 711         struct nft_trans *trans;
 712
 713         trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 714         if (IS_ERR(trans))
 715                 return PTR_ERR(trans);
 716
 717         nft_deactivate_next(ctx->net, flowtable);
 718         nft_use_dec(&ctx->table->use);
 719
 720         return 0;
 721 }
 722
 723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 724 {
 725         int i;
 726
 727         for (i = track->regs[dreg].num_reg; i > 0; i--)
 728                 __nft_reg_track_cancel(track, dreg - i);
 729 }
 730
 731 static void __nft_reg_track_update(struct nft_regs_track *track,
 732                                    const struct nft_expr *expr,
 733                                    u8 dreg, u8 num_reg)
 734 {
 735         track->regs[dreg].selector = expr;
 736         track->regs[dreg].bitwise = NULL;
 737         track->regs[dreg].num_reg = num_reg;
 738 }
 739
 740 void nft_reg_track_update(struct nft_regs_track *track,
 741                           const struct nft_expr *expr, u8 dreg, u8 len)
 742 {
 743         unsigned int regcount;
 744         int i;
 745
 746         __nft_reg_track_clobber(track, dreg);
 747
 748         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 749         for (i = 0; i < regcount; i++, dreg++)
 750                 __nft_reg_track_update(track, expr, dreg, i);
 751 }
 752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 753
 754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 755 {
 756         unsigned int regcount;
 757         int i;
 758
 759         __nft_reg_track_clobber(track, dreg);
 760
 761         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 762         for (i = 0; i < regcount; i++, dreg++)
 763                 __nft_reg_track_cancel(track, dreg);
 764 }
 765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 766
 767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 768 {
 769         track->regs[dreg].selector = NULL;
 770         track->regs[dreg].bitwise = NULL;
 771         track->regs[dreg].num_reg = 0;
 772 }
 773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 774
 775 /*
 776  * Tables
 777  */
 778
 779 static struct nft_table *nft_table_lookup(const struct net *net,
 780                                           const struct nlattr *nla,
 781                                           u8 family, u8 genmask, u32 nlpid)
 782 {
 783         struct nftables_pernet *nft_net;
 784         struct nft_table *table;
 785
 786         if (nla == NULL)
 787                 return ERR_PTR(-EINVAL);
 788
 789         nft_net = nft_pernet(net);
 790         list_for_each_entry_rcu(table, &nft_net->tables, list,
 791                                 lockdep_is_held(&nft_net->commit_mutex)) {
 792                 if (!nla_strcmp(nla, table->name) &&
 793                     table->family == family &&
 794                     nft_active_genmask(table, genmask)) {
 795                         if (nft_table_has_owner(table) &&
 796                             nlpid && table->nlpid != nlpid)
 797                                 return ERR_PTR(-EPERM);
 798
 799                         return table;
 800                 }
 801         }
 802
 803         return ERR_PTR(-ENOENT);
 804 }
 805
 806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 807                                                    const struct nlattr *nla,
 808                                                    int family, u8 genmask, u32 nlpid)
 809 {
 810         struct nftables_pernet *nft_net;
 811         struct nft_table *table;
 812
 813         nft_net = nft_pernet(net);
 814         list_for_each_entry(table, &nft_net->tables, list) {
 815                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 816                     table->family == family &&
 817                     nft_active_genmask(table, genmask)) {
 818                         if (nft_table_has_owner(table) &&
 819                             nlpid && table->nlpid != nlpid)
 820                                 return ERR_PTR(-EPERM);
 821
 822                         return table;
 823                 }
 824         }
 825
 826         return ERR_PTR(-ENOENT);
 827 }
 828
 829 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 830 {
 831         return ++table->hgenerator;
 832 }
 833
 834 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 835
 836 static const struct nft_chain_type *
 837 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 838 {
 839         if (family >= NFPROTO_NUMPROTO ||
 840             type >= NFT_CHAIN_T_MAX)
 841                 return NULL;
 842
 843         return chain_type[family][type];
 844 }
 845
 846 static const struct nft_chain_type *
 847 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 848 {
 849         const struct nft_chain_type *type;
 850         int i;
 851
 852         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 853                 type = __nft_chain_type_get(family, i);
 854                 if (!type)
 855                         continue;
 856                 if (!nla_strcmp(nla, type->name))
 857                         return type;
 858         }
 859         return NULL;
 860 }
 861
 862 struct nft_module_request {
 863         struct list_head        list;
 864         char                    module[MODULE_NAME_LEN];
 865         bool                    done;
 866 };
 867
 868 #ifdef CONFIG_MODULES
 869 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 870                                       ...)
 871 {
 872         char module_name[MODULE_NAME_LEN];
 873         struct nftables_pernet *nft_net;
 874         struct nft_module_request *req;
 875         va_list args;
 876         int ret;
 877
 878         va_start(args, fmt);
 879         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 880         va_end(args);
 881         if (ret >= MODULE_NAME_LEN)
 882                 return 0;
 883
 884         nft_net = nft_pernet(net);
 885         list_for_each_entry(req, &nft_net->module_list, list) {
 886                 if (!strcmp(req->module, module_name)) {
 887                         if (req->done)
 888                                 return 0;
 889
 890                         /* A request to load this module already exists. */
 891                         return -EAGAIN;
 892                 }
 893         }
 894
 895         req = kmalloc(sizeof(*req), GFP_KERNEL);
 896         if (!req)
 897                 return -ENOMEM;
 898
 899         req->done = false;
 900         strscpy(req->module, module_name, MODULE_NAME_LEN);
 901         list_add_tail(&req->list, &nft_net->module_list);
 902
 903         return -EAGAIN;
 904 }
 905 EXPORT_SYMBOL_GPL(nft_request_module);
 906 #endif
 907
 908 static void lockdep_nfnl_nft_mutex_not_held(void)
 909 {
 910 #ifdef CONFIG_PROVE_LOCKING
 911         if (debug_locks)
 912                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 913 #endif
 914 }
 915
 916 static const struct nft_chain_type *
 917 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 918                             u8 family, bool autoload)
 919 {
 920         const struct nft_chain_type *type;
 921
 922         type = __nf_tables_chain_type_lookup(nla, family);
 923         if (type != NULL)
 924                 return type;
 925
 926         lockdep_nfnl_nft_mutex_not_held();
 927 #ifdef CONFIG_MODULES
 928         if (autoload) {
 929                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 930                                        nla_len(nla),
 931                                        (const char *)nla_data(nla)) == -EAGAIN)
 932                         return ERR_PTR(-EAGAIN);
 933         }
 934 #endif
 935         return ERR_PTR(-ENOENT);
 936 }
 937
 938 static __be16 nft_base_seq(const struct net *net)
 939 {
 940         struct nftables_pernet *nft_net = nft_pernet(net);
 941
 942         return htons(nft_net->base_seq & 0xffff);
 943 }
 944
 945 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 946         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 947                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 948         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 949         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 950         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 951                                     .len = NFT_USERDATA_MAXLEN }
 952 };
 953
 954 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 955                                      u32 portid, u32 seq, int event, u32 flags,
 956                                      int family, const struct nft_table *table)
 957 {
 958         struct nlmsghdr *nlh;
 959
 960         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 961         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 962                            NFNETLINK_V0, nft_base_seq(net));
 963         if (!nlh)
 964                 goto nla_put_failure;
 965
 966         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 967             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 968             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 969                          NFTA_TABLE_PAD))
 970                 goto nla_put_failure;
 971
 972         if (event == NFT_MSG_DELTABLE) {
 973                 nlmsg_end(skb, nlh);
 974                 return 0;
 975         }
 976
 977         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 978                          htonl(table->flags & NFT_TABLE_F_MASK)))
 979                 goto nla_put_failure;
 980
 981         if (nft_table_has_owner(table) &&
 982             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 983                 goto nla_put_failure;
 984
 985         if (table->udata) {
 986                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 987                         goto nla_put_failure;
 988         }
 989
 990         nlmsg_end(skb, nlh);
 991         return 0;
 992
 993 nla_put_failure:
 994         nlmsg_trim(skb, nlh);
 995         return -1;
 996 }
 997
 998 struct nftnl_skb_parms {
 999         bool report;
1000 };
1001 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
1002
1003 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1004                                struct list_head *notify_list)
1005 {
1006         NFT_CB(skb).report = report;
1007         list_add_tail(&skb->list, notify_list);
1008 }
1009
1010 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1011 {
1012         struct nftables_pernet *nft_net;
1013         struct sk_buff *skb;
1014         u16 flags = 0;
1015         int err;
1016
1017         if (!ctx->report &&
1018             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1019                 return;
1020
1021         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1022         if (skb == NULL)
1023                 goto err;
1024
1025         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1026                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1027
1028         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1029                                         event, flags, ctx->family, ctx->table);
1030         if (err < 0) {
1031                 kfree_skb(skb);
1032                 goto err;
1033         }
1034
1035         nft_net = nft_pernet(ctx->net);
1036         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1037         return;
1038 err:
1039         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1040 }
1041
1042 static int nf_tables_dump_tables(struct sk_buff *skb,
1043                                  struct netlink_callback *cb)
1044 {
1045         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1046         struct nftables_pernet *nft_net;
1047         const struct nft_table *table;
1048         unsigned int idx = 0, s_idx = cb->args[0];
1049         struct net *net = sock_net(skb->sk);
1050         int family = nfmsg->nfgen_family;
1051
1052         rcu_read_lock();
1053         nft_net = nft_pernet(net);
1054         cb->seq = READ_ONCE(nft_net->base_seq);
1055
1056         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1057                 if (family != NFPROTO_UNSPEC && family != table->family)
1058                         continue;
1059
1060                 if (idx < s_idx)
1061                         goto cont;
1062                 if (idx > s_idx)
1063                         memset(&cb->args[1], 0,
1064                                sizeof(cb->args) - sizeof(cb->args[0]));
1065                 if (!nft_is_active(net, table))
1066                         continue;
1067                 if (nf_tables_fill_table_info(skb, net,
1068                                               NETLINK_CB(cb->skb).portid,
1069                                               cb->nlh->nlmsg_seq,
1070                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1071                                               table->family, table) < 0)
1072                         goto done;
1073
1074                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1075 cont:
1076                 idx++;
1077         }
1078 done:
1079         rcu_read_unlock();
1080         cb->args[0] = idx;
1081         return skb->len;
1082 }
1083
1084 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1085                                       const struct nlmsghdr *nlh,
1086                                       struct netlink_dump_control *c)
1087 {
1088         int err;
1089
1090         if (!try_module_get(THIS_MODULE))
1091                 return -EINVAL;
1092
1093         rcu_read_unlock();
1094         err = netlink_dump_start(nlsk, skb, nlh, c);
1095         rcu_read_lock();
1096         module_put(THIS_MODULE);
1097
1098         return err;
1099 }
1100
1101 /* called with rcu_read_lock held */
1102 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1103                               const struct nlattr * const nla[])
1104 {
1105         struct netlink_ext_ack *extack = info->extack;
1106         u8 genmask = nft_genmask_cur(info->net);
1107         u8 family = info->nfmsg->nfgen_family;
1108         const struct nft_table *table;
1109         struct net *net = info->net;
1110         struct sk_buff *skb2;
1111         int err;
1112
1113         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1114                 struct netlink_dump_control c = {
1115                         .dump = nf_tables_dump_tables,
1116                         .module = THIS_MODULE,
1117                 };
1118
1119                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1120         }
1121
1122         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1123         if (IS_ERR(table)) {
1124                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1125                 return PTR_ERR(table);
1126         }
1127
1128         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1129         if (!skb2)
1130                 return -ENOMEM;
1131
1132         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1133                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1134                                         0, family, table);
1135         if (err < 0)
1136                 goto err_fill_table_info;
1137
1138         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1139
1140 err_fill_table_info:
1141         kfree_skb(skb2);
1142         return err;
1143 }
1144
1145 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1146 {
1147         struct nft_chain *chain;
1148         u32 i = 0;
1149
1150         list_for_each_entry(chain, &table->chains, list) {
1151                 if (!nft_is_active_next(net, chain))
1152                         continue;
1153                 if (!nft_is_base_chain(chain))
1154                         continue;
1155
1156                 if (cnt && i++ == cnt)
1157                         break;
1158
1159                 nf_tables_unregister_hook(net, table, chain);
1160         }
1161 }
1162
1163 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1164 {
1165         struct nft_chain *chain;
1166         int err, i = 0;
1167
1168         list_for_each_entry(chain, &table->chains, list) {
1169                 if (!nft_is_active_next(net, chain))
1170                         continue;
1171                 if (!nft_is_base_chain(chain))
1172                         continue;
1173
1174                 err = nf_tables_register_hook(net, table, chain);
1175                 if (err < 0)
1176                         goto err_register_hooks;
1177
1178                 i++;
1179         }
1180         return 0;
1181
1182 err_register_hooks:
1183         if (i)
1184                 nft_table_disable(net, table, i);
1185         return err;
1186 }
1187
1188 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1189 {
1190         table->flags &= ~NFT_TABLE_F_DORMANT;
1191         nft_table_disable(net, table, 0);
1192         table->flags |= NFT_TABLE_F_DORMANT;
1193 }
1194
1195 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1196 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1197 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1198 #define __NFT_TABLE_F_WAS_ORPHAN        (__NFT_TABLE_F_INTERNAL << 2)
1199 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1200                                          __NFT_TABLE_F_WAS_AWAKEN | \
1201                                          __NFT_TABLE_F_WAS_ORPHAN)
1202
1203 static int nf_tables_updtable(struct nft_ctx *ctx)
1204 {
1205         struct nft_trans *trans;
1206         u32 flags;
1207         int ret;
1208
1209         if (!ctx->nla[NFTA_TABLE_FLAGS])
1210                 return 0;
1211
1212         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1213         if (flags & ~NFT_TABLE_F_MASK)
1214                 return -EOPNOTSUPP;
1215
1216         if (flags == ctx->table->flags)
1217                 return 0;
1218
1219         if ((nft_table_has_owner(ctx->table) &&
1220              !(flags & NFT_TABLE_F_OWNER)) ||
1221             (flags & NFT_TABLE_F_OWNER &&
1222              !nft_table_is_orphan(ctx->table)))
1223                 return -EOPNOTSUPP;
1224
1225         if ((flags ^ ctx->table->flags) & NFT_TABLE_F_PERSIST)
1226                 return -EOPNOTSUPP;
1227
1228         /* No dormant off/on/off/on games in single transaction */
1229         if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1230                 return -EINVAL;
1231
1232         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1233                                 sizeof(struct nft_trans_table));
1234         if (trans == NULL)
1235                 return -ENOMEM;
1236
1237         if ((flags & NFT_TABLE_F_DORMANT) &&
1238             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1239                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1240                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1241                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1242         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1243                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1244                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1245                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1246                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1247                         if (ret < 0)
1248                                 goto err_register_hooks;
1249
1250                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1251                 }
1252         }
1253
1254         if ((flags & NFT_TABLE_F_OWNER) &&
1255             !nft_table_has_owner(ctx->table)) {
1256                 ctx->table->nlpid = ctx->portid;
1257                 ctx->table->flags |= NFT_TABLE_F_OWNER |
1258                                      __NFT_TABLE_F_WAS_ORPHAN;
1259         }
1260
1261         nft_trans_table_update(trans) = true;
1262         nft_trans_commit_list_add_tail(ctx->net, trans);
1263
1264         return 0;
1265
1266 err_register_hooks:
1267         ctx->table->flags |= NFT_TABLE_F_DORMANT;
1268         nft_trans_destroy(trans);
1269         return ret;
1270 }
1271
1272 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1273 {
1274         const char *name = data;
1275
1276         return jhash(name, strlen(name), seed);
1277 }
1278
1279 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1280 {
1281         const struct nft_chain *chain = data;
1282
1283         return nft_chain_hash(chain->name, 0, seed);
1284 }
1285
1286 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1287                               const void *ptr)
1288 {
1289         const struct nft_chain *chain = ptr;
1290         const char *name = arg->key;
1291
1292         return strcmp(chain->name, name);
1293 }
1294
1295 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1296 {
1297         const struct nft_object_hash_key *k = data;
1298
1299         seed ^= hash_ptr(k->table, 32);
1300
1301         return jhash(k->name, strlen(k->name), seed);
1302 }
1303
1304 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1305 {
1306         const struct nft_object *obj = data;
1307
1308         return nft_objname_hash(&obj->key, 0, seed);
1309 }
1310
1311 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1312                                 const void *ptr)
1313 {
1314         const struct nft_object_hash_key *k = arg->key;
1315         const struct nft_object *obj = ptr;
1316
1317         if (obj->key.table != k->table)
1318                 return -1;
1319
1320         return strcmp(obj->key.name, k->name);
1321 }
1322
1323 static bool nft_supported_family(u8 family)
1324 {
1325         return false
1326 #ifdef CONFIG_NF_TABLES_INET
1327                 || family == NFPROTO_INET
1328 #endif
1329 #ifdef CONFIG_NF_TABLES_IPV4
1330                 || family == NFPROTO_IPV4
1331 #endif
1332 #ifdef CONFIG_NF_TABLES_ARP
1333                 || family == NFPROTO_ARP
1334 #endif
1335 #ifdef CONFIG_NF_TABLES_NETDEV
1336                 || family == NFPROTO_NETDEV
1337 #endif
1338 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1339                 || family == NFPROTO_BRIDGE
1340 #endif
1341 #ifdef CONFIG_NF_TABLES_IPV6
1342                 || family == NFPROTO_IPV6
1343 #endif
1344                 ;
1345 }
1346
1347 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1348                               const struct nlattr * const nla[])
1349 {
1350         struct nftables_pernet *nft_net = nft_pernet(info->net);
1351         struct netlink_ext_ack *extack = info->extack;
1352         u8 genmask = nft_genmask_next(info->net);
1353         u8 family = info->nfmsg->nfgen_family;
1354         struct net *net = info->net;
1355         const struct nlattr *attr;
1356         struct nft_table *table;
1357         struct nft_ctx ctx;
1358         u32 flags = 0;
1359         int err;
1360
1361         if (!nft_supported_family(family))
1362                 return -EOPNOTSUPP;
1363
1364         lockdep_assert_held(&nft_net->commit_mutex);
1365         attr = nla[NFTA_TABLE_NAME];
1366         table = nft_table_lookup(net, attr, family, genmask,
1367                                  NETLINK_CB(skb).portid);
1368         if (IS_ERR(table)) {
1369                 if (PTR_ERR(table) != -ENOENT)
1370                         return PTR_ERR(table);
1371         } else {
1372                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1373                         NL_SET_BAD_ATTR(extack, attr);
1374                         return -EEXIST;
1375                 }
1376                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1377                         return -EOPNOTSUPP;
1378
1379                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1380
1381                 return nf_tables_updtable(&ctx);
1382         }
1383
1384         if (nla[NFTA_TABLE_FLAGS]) {
1385                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1386                 if (flags & ~NFT_TABLE_F_MASK)
1387                         return -EOPNOTSUPP;
1388         }
1389
1390         err = -ENOMEM;
1391         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1392         if (table == NULL)
1393                 goto err_kzalloc;
1394
1395         table->validate_state = nft_net->validate_state;
1396         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1397         if (table->name == NULL)
1398                 goto err_strdup;
1399
1400         if (nla[NFTA_TABLE_USERDATA]) {
1401                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1402                 if (table->udata == NULL)
1403                         goto err_table_udata;
1404
1405                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1406         }
1407
1408         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1409         if (err)
1410                 goto err_chain_ht;
1411
1412         INIT_LIST_HEAD(&table->chains);
1413         INIT_LIST_HEAD(&table->sets);
1414         INIT_LIST_HEAD(&table->objects);
1415         INIT_LIST_HEAD(&table->flowtables);
1416         table->family = family;
1417         table->flags = flags;
1418         table->handle = ++nft_net->table_handle;
1419         if (table->flags & NFT_TABLE_F_OWNER)
1420                 table->nlpid = NETLINK_CB(skb).portid;
1421
1422         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1423         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1424         if (err < 0)
1425                 goto err_trans;
1426
1427         list_add_tail_rcu(&table->list, &nft_net->tables);
1428         return 0;
1429 err_trans:
1430         rhltable_destroy(&table->chains_ht);
1431 err_chain_ht:
1432         kfree(table->udata);
1433 err_table_udata:
1434         kfree(table->name);
1435 err_strdup:
1436         kfree(table);
1437 err_kzalloc:
1438         return err;
1439 }
1440
1441 static int nft_flush_table(struct nft_ctx *ctx)
1442 {
1443         struct nft_flowtable *flowtable, *nft;
1444         struct nft_chain *chain, *nc;
1445         struct nft_object *obj, *ne;
1446         struct nft_set *set, *ns;
1447         int err;
1448
1449         list_for_each_entry(chain, &ctx->table->chains, list) {
1450                 if (!nft_is_active_next(ctx->net, chain))
1451                         continue;
1452
1453                 if (nft_chain_binding(chain))
1454                         continue;
1455
1456                 ctx->chain = chain;
1457
1458                 err = nft_delrule_by_chain(ctx);
1459                 if (err < 0)
1460                         goto out;
1461         }
1462
1463         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1464                 if (!nft_is_active_next(ctx->net, set))
1465                         continue;
1466
1467                 if (nft_set_is_anonymous(set))
1468                         continue;
1469
1470                 err = nft_delset(ctx, set);
1471                 if (err < 0)
1472                         goto out;
1473         }
1474
1475         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1476                 if (!nft_is_active_next(ctx->net, flowtable))
1477                         continue;
1478
1479                 err = nft_delflowtable(ctx, flowtable);
1480                 if (err < 0)
1481                         goto out;
1482         }
1483
1484         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1485                 if (!nft_is_active_next(ctx->net, obj))
1486                         continue;
1487
1488                 err = nft_delobj(ctx, obj);
1489                 if (err < 0)
1490                         goto out;
1491         }
1492
1493         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1494                 if (!nft_is_active_next(ctx->net, chain))
1495                         continue;
1496
1497                 if (nft_chain_binding(chain))
1498                         continue;
1499
1500                 ctx->chain = chain;
1501
1502                 err = nft_delchain(ctx);
1503                 if (err < 0)
1504                         goto out;
1505         }
1506
1507         err = nft_deltable(ctx);
1508 out:
1509         return err;
1510 }
1511
1512 static int nft_flush(struct nft_ctx *ctx, int family)
1513 {
1514         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1515         const struct nlattr * const *nla = ctx->nla;
1516         struct nft_table *table, *nt;
1517         int err = 0;
1518
1519         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1520                 if (family != AF_UNSPEC && table->family != family)
1521                         continue;
1522
1523                 ctx->family = table->family;
1524
1525                 if (!nft_is_active_next(ctx->net, table))
1526                         continue;
1527
1528                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1529                         continue;
1530
1531                 if (nla[NFTA_TABLE_NAME] &&
1532                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1533                         continue;
1534
1535                 ctx->table = table;
1536
1537                 err = nft_flush_table(ctx);
1538                 if (err < 0)
1539                         goto out;
1540         }
1541 out:
1542         return err;
1543 }
1544
1545 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1546                               const struct nlattr * const nla[])
1547 {
1548         struct netlink_ext_ack *extack = info->extack;
1549         u8 genmask = nft_genmask_next(info->net);
1550         u8 family = info->nfmsg->nfgen_family;
1551         struct net *net = info->net;
1552         const struct nlattr *attr;
1553         struct nft_table *table;
1554         struct nft_ctx ctx;
1555
1556         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1557         if (family == AF_UNSPEC ||
1558             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1559                 return nft_flush(&ctx, family);
1560
1561         if (nla[NFTA_TABLE_HANDLE]) {
1562                 attr = nla[NFTA_TABLE_HANDLE];
1563                 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1564                                                   NETLINK_CB(skb).portid);
1565         } else {
1566                 attr = nla[NFTA_TABLE_NAME];
1567                 table = nft_table_lookup(net, attr, family, genmask,
1568                                          NETLINK_CB(skb).portid);
1569         }
1570
1571         if (IS_ERR(table)) {
1572                 if (PTR_ERR(table) == -ENOENT &&
1573                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1574                         return 0;
1575
1576                 NL_SET_BAD_ATTR(extack, attr);
1577                 return PTR_ERR(table);
1578         }
1579
1580         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1581             table->use > 0)
1582                 return -EBUSY;
1583
1584         ctx.family = family;
1585         ctx.table = table;
1586
1587         return nft_flush_table(&ctx);
1588 }
1589
1590 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1591 {
1592         if (WARN_ON(ctx->table->use > 0))
1593                 return;
1594
1595         rhltable_destroy(&ctx->table->chains_ht);
1596         kfree(ctx->table->name);
1597         kfree(ctx->table->udata);
1598         kfree(ctx->table);
1599 }
1600
1601 void nft_register_chain_type(const struct nft_chain_type *ctype)
1602 {
1603         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1604         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1605                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1606                 return;
1607         }
1608         chain_type[ctype->family][ctype->type] = ctype;
1609         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1610 }
1611 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1612
1613 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1614 {
1615         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1616         chain_type[ctype->family][ctype->type] = NULL;
1617         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1618 }
1619 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1620
1621 /*
1622  * Chains
1623  */
1624
1625 static struct nft_chain *
1626 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1627 {
1628         struct nft_chain *chain;
1629
1630         list_for_each_entry(chain, &table->chains, list) {
1631                 if (chain->handle == handle &&
1632                     nft_active_genmask(chain, genmask))
1633                         return chain;
1634         }
1635
1636         return ERR_PTR(-ENOENT);
1637 }
1638
1639 static bool lockdep_commit_lock_is_held(const struct net *net)
1640 {
1641 #ifdef CONFIG_PROVE_LOCKING
1642         struct nftables_pernet *nft_net = nft_pernet(net);
1643
1644         return lockdep_is_held(&nft_net->commit_mutex);
1645 #else
1646         return true;
1647 #endif
1648 }
1649
1650 static struct nft_chain *nft_chain_lookup(struct net *net,
1651                                           struct nft_table *table,
1652                                           const struct nlattr *nla, u8 genmask)
1653 {
1654         char search[NFT_CHAIN_MAXNAMELEN + 1];
1655         struct rhlist_head *tmp, *list;
1656         struct nft_chain *chain;
1657
1658         if (nla == NULL)
1659                 return ERR_PTR(-EINVAL);
1660
1661         nla_strscpy(search, nla, sizeof(search));
1662
1663         WARN_ON(!rcu_read_lock_held() &&
1664                 !lockdep_commit_lock_is_held(net));
1665
1666         chain = ERR_PTR(-ENOENT);
1667         rcu_read_lock();
1668         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1669         if (!list)
1670                 goto out_unlock;
1671
1672         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1673                 if (nft_active_genmask(chain, genmask))
1674                         goto out_unlock;
1675         }
1676         chain = ERR_PTR(-ENOENT);
1677 out_unlock:
1678         rcu_read_unlock();
1679         return chain;
1680 }
1681
1682 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1683         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1684                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1685         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1686         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1687                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1688         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1689         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1690         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1691                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1692         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1693         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1694         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1695         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1696                                     .len = NFT_USERDATA_MAXLEN },
1697 };
1698
1699 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1700         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1701         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1702         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1703                                     .len = IFNAMSIZ - 1 },
1704 };
1705
1706 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1707 {
1708         struct nft_stats *cpu_stats, total;
1709         struct nlattr *nest;
1710         unsigned int seq;
1711         u64 pkts, bytes;
1712         int cpu;
1713
1714         if (!stats)
1715                 return 0;
1716
1717         memset(&total, 0, sizeof(total));
1718         for_each_possible_cpu(cpu) {
1719                 cpu_stats = per_cpu_ptr(stats, cpu);
1720                 do {
1721                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1722                         pkts = cpu_stats->pkts;
1723                         bytes = cpu_stats->bytes;
1724                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1725                 total.pkts += pkts;
1726                 total.bytes += bytes;
1727         }
1728         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1729         if (nest == NULL)
1730                 goto nla_put_failure;
1731
1732         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1733                          NFTA_COUNTER_PAD) ||
1734             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1735                          NFTA_COUNTER_PAD))
1736                 goto nla_put_failure;
1737
1738         nla_nest_end(skb, nest);
1739         return 0;
1740
1741 nla_put_failure:
1742         return -ENOSPC;
1743 }
1744
1745 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1746                                    const struct nft_base_chain *basechain,
1747                                    const struct list_head *hook_list)
1748 {
1749         const struct nf_hook_ops *ops = &basechain->ops;
1750         struct nft_hook *hook, *first = NULL;
1751         struct nlattr *nest, *nest_devs;
1752         int n = 0;
1753
1754         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1755         if (nest == NULL)
1756                 goto nla_put_failure;
1757         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1758                 goto nla_put_failure;
1759         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1760                 goto nla_put_failure;
1761
1762         if (nft_base_chain_netdev(family, ops->hooknum)) {
1763                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1764                 if (!nest_devs)
1765                         goto nla_put_failure;
1766
1767                 if (!hook_list)
1768                         hook_list = &basechain->hook_list;
1769
1770                 list_for_each_entry(hook, hook_list, list) {
1771                         if (!first)
1772                                 first = hook;
1773
1774                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1775                                            hook->ops.dev->name))
1776                                 goto nla_put_failure;
1777                         n++;
1778                 }
1779                 nla_nest_end(skb, nest_devs);
1780
1781                 if (n == 1 &&
1782                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1783                         goto nla_put_failure;
1784         }
1785         nla_nest_end(skb, nest);
1786
1787         return 0;
1788 nla_put_failure:
1789         return -1;
1790 }
1791
1792 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1793                                      u32 portid, u32 seq, int event, u32 flags,
1794                                      int family, const struct nft_table *table,
1795                                      const struct nft_chain *chain,
1796                                      const struct list_head *hook_list)
1797 {
1798         struct nlmsghdr *nlh;
1799
1800         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1801         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1802                            NFNETLINK_V0, nft_base_seq(net));
1803         if (!nlh)
1804                 goto nla_put_failure;
1805
1806         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1807             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1808             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1809                          NFTA_CHAIN_PAD))
1810                 goto nla_put_failure;
1811
1812         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1813                 nlmsg_end(skb, nlh);
1814                 return 0;
1815         }
1816
1817         if (nft_is_base_chain(chain)) {
1818                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1819                 struct nft_stats __percpu *stats;
1820
1821                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1822                         goto nla_put_failure;
1823
1824                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1825                                  htonl(basechain->policy)))
1826                         goto nla_put_failure;
1827
1828                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1829                         goto nla_put_failure;
1830
1831                 stats = rcu_dereference_check(basechain->stats,
1832                                               lockdep_commit_lock_is_held(net));
1833                 if (nft_dump_stats(skb, stats))
1834                         goto nla_put_failure;
1835         }
1836
1837         if (chain->flags &&
1838             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1839                 goto nla_put_failure;
1840
1841         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1842                 goto nla_put_failure;
1843
1844         if (chain->udata &&
1845             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1846                 goto nla_put_failure;
1847
1848         nlmsg_end(skb, nlh);
1849         return 0;
1850
1851 nla_put_failure:
1852         nlmsg_trim(skb, nlh);
1853         return -1;
1854 }
1855
1856 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1857                                    const struct list_head *hook_list)
1858 {
1859         struct nftables_pernet *nft_net;
1860         struct sk_buff *skb;
1861         u16 flags = 0;
1862         int err;
1863
1864         if (!ctx->report &&
1865             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1866                 return;
1867
1868         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1869         if (skb == NULL)
1870                 goto err;
1871
1872         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1873                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1874
1875         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1876                                         event, flags, ctx->family, ctx->table,
1877                                         ctx->chain, hook_list);
1878         if (err < 0) {
1879                 kfree_skb(skb);
1880                 goto err;
1881         }
1882
1883         nft_net = nft_pernet(ctx->net);
1884         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1885         return;
1886 err:
1887         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1888 }
1889
1890 static int nf_tables_dump_chains(struct sk_buff *skb,
1891                                  struct netlink_callback *cb)
1892 {
1893         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1894         unsigned int idx = 0, s_idx = cb->args[0];
1895         struct net *net = sock_net(skb->sk);
1896         int family = nfmsg->nfgen_family;
1897         struct nftables_pernet *nft_net;
1898         const struct nft_table *table;
1899         const struct nft_chain *chain;
1900
1901         rcu_read_lock();
1902         nft_net = nft_pernet(net);
1903         cb->seq = READ_ONCE(nft_net->base_seq);
1904
1905         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1906                 if (family != NFPROTO_UNSPEC && family != table->family)
1907                         continue;
1908
1909                 list_for_each_entry_rcu(chain, &table->chains, list) {
1910                         if (idx < s_idx)
1911                                 goto cont;
1912                         if (idx > s_idx)
1913                                 memset(&cb->args[1], 0,
1914                                        sizeof(cb->args) - sizeof(cb->args[0]));
1915                         if (!nft_is_active(net, chain))
1916                                 continue;
1917                         if (nf_tables_fill_chain_info(skb, net,
1918                                                       NETLINK_CB(cb->skb).portid,
1919                                                       cb->nlh->nlmsg_seq,
1920                                                       NFT_MSG_NEWCHAIN,
1921                                                       NLM_F_MULTI,
1922                                                       table->family, table,
1923                                                       chain, NULL) < 0)
1924                                 goto done;
1925
1926                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1927 cont:
1928                         idx++;
1929                 }
1930         }
1931 done:
1932         rcu_read_unlock();
1933         cb->args[0] = idx;
1934         return skb->len;
1935 }
1936
1937 /* called with rcu_read_lock held */
1938 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1939                               const struct nlattr * const nla[])
1940 {
1941         struct netlink_ext_ack *extack = info->extack;
1942         u8 genmask = nft_genmask_cur(info->net);
1943         u8 family = info->nfmsg->nfgen_family;
1944         const struct nft_chain *chain;
1945         struct net *net = info->net;
1946         struct nft_table *table;
1947         struct sk_buff *skb2;
1948         int err;
1949
1950         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1951                 struct netlink_dump_control c = {
1952                         .dump = nf_tables_dump_chains,
1953                         .module = THIS_MODULE,
1954                 };
1955
1956                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1957         }
1958
1959         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1960         if (IS_ERR(table)) {
1961                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1962                 return PTR_ERR(table);
1963         }
1964
1965         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1966         if (IS_ERR(chain)) {
1967                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1968                 return PTR_ERR(chain);
1969         }
1970
1971         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1972         if (!skb2)
1973                 return -ENOMEM;
1974
1975         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1976                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1977                                         0, family, table, chain, NULL);
1978         if (err < 0)
1979                 goto err_fill_chain_info;
1980
1981         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1982
1983 err_fill_chain_info:
1984         kfree_skb(skb2);
1985         return err;
1986 }
1987
1988 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1989         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1990         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1991 };
1992
1993 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1994 {
1995         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1996         struct nft_stats __percpu *newstats;
1997         struct nft_stats *stats;
1998         int err;
1999
2000         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
2001                                           nft_counter_policy, NULL);
2002         if (err < 0)
2003                 return ERR_PTR(err);
2004
2005         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
2006                 return ERR_PTR(-EINVAL);
2007
2008         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
2009         if (newstats == NULL)
2010                 return ERR_PTR(-ENOMEM);
2011
2012         /* Restore old counters on this cpu, no problem. Per-cpu statistics
2013          * are not exposed to userspace.
2014          */
2015         preempt_disable();
2016         stats = this_cpu_ptr(newstats);
2017         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2018         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2019         preempt_enable();
2020
2021         return newstats;
2022 }
2023
2024 static void nft_chain_stats_replace(struct nft_trans *trans)
2025 {
2026         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2027
2028         if (!nft_trans_chain_stats(trans))
2029                 return;
2030
2031         nft_trans_chain_stats(trans) =
2032                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2033                                     lockdep_commit_lock_is_held(trans->ctx.net));
2034
2035         if (!nft_trans_chain_stats(trans))
2036                 static_branch_inc(&nft_counters_enabled);
2037 }
2038
2039 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2040 {
2041         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2042         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2043
2044         if (g0 != g1)
2045                 kvfree(g1);
2046         kvfree(g0);
2047
2048         /* should be NULL either via abort or via successful commit */
2049         WARN_ON_ONCE(chain->blob_next);
2050         kvfree(chain->blob_next);
2051 }
2052
2053 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2054 {
2055         struct nft_chain *chain = ctx->chain;
2056         struct nft_hook *hook, *next;
2057
2058         if (WARN_ON(chain->use > 0))
2059                 return;
2060
2061         /* no concurrent access possible anymore */
2062         nf_tables_chain_free_chain_rules(chain);
2063
2064         if (nft_is_base_chain(chain)) {
2065                 struct nft_base_chain *basechain = nft_base_chain(chain);
2066
2067                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2068                         list_for_each_entry_safe(hook, next,
2069                                                  &basechain->hook_list, list) {
2070                                 list_del_rcu(&hook->list);
2071                                 kfree_rcu(hook, rcu);
2072                         }
2073                 }
2074                 module_put(basechain->type->owner);
2075                 if (rcu_access_pointer(basechain->stats)) {
2076                         static_branch_dec(&nft_counters_enabled);
2077                         free_percpu(rcu_dereference_raw(basechain->stats));
2078                 }
2079                 kfree(chain->name);
2080                 kfree(chain->udata);
2081                 kfree(basechain);
2082         } else {
2083                 kfree(chain->name);
2084                 kfree(chain->udata);
2085                 kfree(chain);
2086         }
2087 }
2088
2089 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2090                                               const struct nlattr *attr)
2091 {
2092         struct net_device *dev;
2093         char ifname[IFNAMSIZ];
2094         struct nft_hook *hook;
2095         int err;
2096
2097         hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2098         if (!hook) {
2099                 err = -ENOMEM;
2100                 goto err_hook_alloc;
2101         }
2102
2103         nla_strscpy(ifname, attr, IFNAMSIZ);
2104         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2105          * indirectly serializing all the other holders of the commit_mutex with
2106          * the rtnl_mutex.
2107          */
2108         dev = __dev_get_by_name(net, ifname);
2109         if (!dev) {
2110                 err = -ENOENT;
2111                 goto err_hook_dev;
2112         }
2113         hook->ops.dev = dev;
2114
2115         return hook;
2116
2117 err_hook_dev:
2118         kfree(hook);
2119 err_hook_alloc:
2120         return ERR_PTR(err);
2121 }
2122
2123 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2124                                            const struct nft_hook *this)
2125 {
2126         struct nft_hook *hook;
2127
2128         list_for_each_entry(hook, hook_list, list) {
2129                 if (this->ops.dev == hook->ops.dev)
2130                         return hook;
2131         }
2132
2133         return NULL;
2134 }
2135
2136 static int nf_tables_parse_netdev_hooks(struct net *net,
2137                                         const struct nlattr *attr,
2138                                         struct list_head *hook_list,
2139                                         struct netlink_ext_ack *extack)
2140 {
2141         struct nft_hook *hook, *next;
2142         const struct nlattr *tmp;
2143         int rem, n = 0, err;
2144
2145         nla_for_each_nested(tmp, attr, rem) {
2146                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2147                         err = -EINVAL;
2148                         goto err_hook;
2149                 }
2150
2151                 hook = nft_netdev_hook_alloc(net, tmp);
2152                 if (IS_ERR(hook)) {
2153                         NL_SET_BAD_ATTR(extack, tmp);
2154                         err = PTR_ERR(hook);
2155                         goto err_hook;
2156                 }
2157                 if (nft_hook_list_find(hook_list, hook)) {
2158                         NL_SET_BAD_ATTR(extack, tmp);
2159                         kfree(hook);
2160                         err = -EEXIST;
2161                         goto err_hook;
2162                 }
2163                 list_add_tail(&hook->list, hook_list);
2164                 n++;
2165
2166                 if (n == NFT_NETDEVICE_MAX) {
2167                         err = -EFBIG;
2168                         goto err_hook;
2169                 }
2170         }
2171
2172         return 0;
2173
2174 err_hook:
2175         list_for_each_entry_safe(hook, next, hook_list, list) {
2176                 list_del(&hook->list);
2177                 kfree(hook);
2178         }
2179         return err;
2180 }
2181
2182 struct nft_chain_hook {
2183         u32                             num;
2184         s32                             priority;
2185         const struct nft_chain_type     *type;
2186         struct list_head                list;
2187 };
2188
2189 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2190                                   struct list_head *hook_list,
2191                                   struct netlink_ext_ack *extack, u32 flags)
2192 {
2193         struct nft_hook *hook;
2194         int err;
2195
2196         if (tb[NFTA_HOOK_DEV]) {
2197                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2198                 if (IS_ERR(hook)) {
2199                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2200                         return PTR_ERR(hook);
2201                 }
2202
2203                 list_add_tail(&hook->list, hook_list);
2204         } else if (tb[NFTA_HOOK_DEVS]) {
2205                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2206                                                    hook_list, extack);
2207                 if (err < 0)
2208                         return err;
2209
2210         }
2211
2212         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2213             list_empty(hook_list))
2214                 return -EINVAL;
2215
2216         return 0;
2217 }
2218
2219 static int nft_chain_parse_hook(struct net *net,
2220                                 struct nft_base_chain *basechain,
2221                                 const struct nlattr * const nla[],
2222                                 struct nft_chain_hook *hook, u8 family,
2223                                 u32 flags, struct netlink_ext_ack *extack)
2224 {
2225         struct nftables_pernet *nft_net = nft_pernet(net);
2226         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2227         const struct nft_chain_type *type;
2228         int err;
2229
2230         lockdep_assert_held(&nft_net->commit_mutex);
2231         lockdep_nfnl_nft_mutex_not_held();
2232
2233         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2234                                           nla[NFTA_CHAIN_HOOK],
2235                                           nft_hook_policy, NULL);
2236         if (err < 0)
2237                 return err;
2238
2239         if (!basechain) {
2240                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2241                     !ha[NFTA_HOOK_PRIORITY]) {
2242                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2243                         return -ENOENT;
2244                 }
2245
2246                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2247                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2248
2249                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2250                 if (!type)
2251                         return -EOPNOTSUPP;
2252
2253                 if (nla[NFTA_CHAIN_TYPE]) {
2254                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2255                                                            family, true);
2256                         if (IS_ERR(type)) {
2257                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2258                                 return PTR_ERR(type);
2259                         }
2260                 }
2261                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2262                         return -EOPNOTSUPP;
2263
2264                 if (type->type == NFT_CHAIN_T_NAT &&
2265                     hook->priority <= NF_IP_PRI_CONNTRACK)
2266                         return -EOPNOTSUPP;
2267         } else {
2268                 if (ha[NFTA_HOOK_HOOKNUM]) {
2269                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2270                         if (hook->num != basechain->ops.hooknum)
2271                                 return -EOPNOTSUPP;
2272                 }
2273                 if (ha[NFTA_HOOK_PRIORITY]) {
2274                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2275                         if (hook->priority != basechain->ops.priority)
2276                                 return -EOPNOTSUPP;
2277                 }
2278
2279                 if (nla[NFTA_CHAIN_TYPE]) {
2280                         type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2281                                                              family);
2282                         if (!type) {
2283                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2284                                 return -ENOENT;
2285                         }
2286                 } else {
2287                         type = basechain->type;
2288                 }
2289         }
2290
2291         if (!try_module_get(type->owner)) {
2292                 if (nla[NFTA_CHAIN_TYPE])
2293                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2294                 return -ENOENT;
2295         }
2296
2297         hook->type = type;
2298
2299         INIT_LIST_HEAD(&hook->list);
2300         if (nft_base_chain_netdev(family, hook->num)) {
2301                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2302                 if (err < 0) {
2303                         module_put(type->owner);
2304                         return err;
2305                 }
2306         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2307                 module_put(type->owner);
2308                 return -EOPNOTSUPP;
2309         }
2310
2311         return 0;
2312 }
2313
2314 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2315 {
2316         struct nft_hook *h, *next;
2317
2318         list_for_each_entry_safe(h, next, &hook->list, list) {
2319                 list_del(&h->list);
2320                 kfree(h);
2321         }
2322         module_put(hook->type->owner);
2323 }
2324
2325 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2326 {
2327         struct nft_rule_dp_last *lrule;
2328
2329         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2330
2331         lrule = (struct nft_rule_dp_last *)ptr;
2332         lrule->end.is_last = 1;
2333         lrule->chain = chain;
2334         /* blob size does not include the trailer rule */
2335 }
2336
2337 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2338                                                          unsigned int size)
2339 {
2340         struct nft_rule_blob *blob;
2341
2342         if (size > INT_MAX)
2343                 return NULL;
2344
2345         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2346
2347         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2348         if (!blob)
2349                 return NULL;
2350
2351         blob->size = 0;
2352         nft_last_rule(chain, blob->data);
2353
2354         return blob;
2355 }
2356
2357 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2358                                     const struct nft_chain_hook *hook,
2359                                     struct nft_chain *chain)
2360 {
2361         ops->pf                 = family;
2362         ops->hooknum            = hook->num;
2363         ops->priority           = hook->priority;
2364         ops->priv               = chain;
2365         ops->hook               = hook->type->hooks[ops->hooknum];
2366         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2367 }
2368
2369 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2370                               struct nft_chain_hook *hook, u32 flags)
2371 {
2372         struct nft_chain *chain;
2373         struct nft_hook *h;
2374
2375         basechain->type = hook->type;
2376         INIT_LIST_HEAD(&basechain->hook_list);
2377         chain = &basechain->chain;
2378
2379         if (nft_base_chain_netdev(family, hook->num)) {
2380                 list_splice_init(&hook->list, &basechain->hook_list);
2381                 list_for_each_entry(h, &basechain->hook_list, list)
2382                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2383         }
2384         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2385
2386         chain->flags |= NFT_CHAIN_BASE | flags;
2387         basechain->policy = NF_ACCEPT;
2388         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2389             !nft_chain_offload_support(basechain)) {
2390                 list_splice_init(&basechain->hook_list, &hook->list);
2391                 return -EOPNOTSUPP;
2392         }
2393
2394         flow_block_init(&basechain->flow_block);
2395
2396         return 0;
2397 }
2398
2399 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2400 {
2401         int err;
2402
2403         err = rhltable_insert_key(&table->chains_ht, chain->name,
2404                                   &chain->rhlhead, nft_chain_ht_params);
2405         if (err)
2406                 return err;
2407
2408         list_add_tail_rcu(&chain->list, &table->chains);
2409
2410         return 0;
2411 }
2412
2413 static u64 chain_id;
2414
2415 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2416                               u8 policy, u32 flags,
2417                               struct netlink_ext_ack *extack)
2418 {
2419         const struct nlattr * const *nla = ctx->nla;
2420         struct nft_table *table = ctx->table;
2421         struct nft_base_chain *basechain;
2422         struct net *net = ctx->net;
2423         char name[NFT_NAME_MAXLEN];
2424         struct nft_rule_blob *blob;
2425         struct nft_trans *trans;
2426         struct nft_chain *chain;
2427         int err;
2428
2429         if (nla[NFTA_CHAIN_HOOK]) {
2430                 struct nft_stats __percpu *stats = NULL;
2431                 struct nft_chain_hook hook = {};
2432
2433                 if (flags & NFT_CHAIN_BINDING)
2434                         return -EOPNOTSUPP;
2435
2436                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2437                                            extack);
2438                 if (err < 0)
2439                         return err;
2440
2441                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2442                 if (basechain == NULL) {
2443                         nft_chain_release_hook(&hook);
2444                         return -ENOMEM;
2445                 }
2446                 chain = &basechain->chain;
2447
2448                 if (nla[NFTA_CHAIN_COUNTERS]) {
2449                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2450                         if (IS_ERR(stats)) {
2451                                 nft_chain_release_hook(&hook);
2452                                 kfree(basechain);
2453                                 return PTR_ERR(stats);
2454                         }
2455                         rcu_assign_pointer(basechain->stats, stats);
2456                 }
2457
2458                 err = nft_basechain_init(basechain, family, &hook, flags);
2459                 if (err < 0) {
2460                         nft_chain_release_hook(&hook);
2461                         kfree(basechain);
2462                         free_percpu(stats);
2463                         return err;
2464                 }
2465                 if (stats)
2466                         static_branch_inc(&nft_counters_enabled);
2467         } else {
2468                 if (flags & NFT_CHAIN_BASE)
2469                         return -EINVAL;
2470                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2471                         return -EOPNOTSUPP;
2472
2473                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2474                 if (chain == NULL)
2475                         return -ENOMEM;
2476
2477                 chain->flags = flags;
2478         }
2479         ctx->chain = chain;
2480
2481         INIT_LIST_HEAD(&chain->rules);
2482         chain->handle = nf_tables_alloc_handle(table);
2483         chain->table = table;
2484
2485         if (nla[NFTA_CHAIN_NAME]) {
2486                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2487         } else {
2488                 if (!(flags & NFT_CHAIN_BINDING)) {
2489                         err = -EINVAL;
2490                         goto err_destroy_chain;
2491                 }
2492
2493                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2494                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2495         }
2496
2497         if (!chain->name) {
2498                 err = -ENOMEM;
2499                 goto err_destroy_chain;
2500         }
2501
2502         if (nla[NFTA_CHAIN_USERDATA]) {
2503                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2504                 if (chain->udata == NULL) {
2505                         err = -ENOMEM;
2506                         goto err_destroy_chain;
2507                 }
2508                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2509         }
2510
2511         blob = nf_tables_chain_alloc_rules(chain, 0);
2512         if (!blob) {
2513                 err = -ENOMEM;
2514                 goto err_destroy_chain;
2515         }
2516
2517         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2518         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2519
2520         if (!nft_use_inc(&table->use)) {
2521                 err = -EMFILE;
2522                 goto err_destroy_chain;
2523         }
2524
2525         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2526         if (IS_ERR(trans)) {
2527                 err = PTR_ERR(trans);
2528                 goto err_trans;
2529         }
2530
2531         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2532         if (nft_is_base_chain(chain))
2533                 nft_trans_chain_policy(trans) = policy;
2534
2535         err = nft_chain_add(table, chain);
2536         if (err < 0)
2537                 goto err_chain_add;
2538
2539         /* This must be LAST to ensure no packets are walking over this chain. */
2540         err = nf_tables_register_hook(net, table, chain);
2541         if (err < 0)
2542                 goto err_register_hook;
2543
2544         return 0;
2545
2546 err_register_hook:
2547         nft_chain_del(chain);
2548 err_chain_add:
2549         nft_trans_destroy(trans);
2550 err_trans:
2551         nft_use_dec_restore(&table->use);
2552 err_destroy_chain:
2553         nf_tables_chain_destroy(ctx);
2554
2555         return err;
2556 }
2557
2558 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2559                               u32 flags, const struct nlattr *attr,
2560                               struct netlink_ext_ack *extack)
2561 {
2562         const struct nlattr * const *nla = ctx->nla;
2563         struct nft_base_chain *basechain = NULL;
2564         struct nft_table *table = ctx->table;
2565         struct nft_chain *chain = ctx->chain;
2566         struct nft_chain_hook hook = {};
2567         struct nft_stats *stats = NULL;
2568         struct nft_hook *h, *next;
2569         struct nf_hook_ops *ops;
2570         struct nft_trans *trans;
2571         bool unregister = false;
2572         int err;
2573
2574         if (chain->flags ^ flags)
2575                 return -EOPNOTSUPP;
2576
2577         INIT_LIST_HEAD(&hook.list);
2578
2579         if (nla[NFTA_CHAIN_HOOK]) {
2580                 if (!nft_is_base_chain(chain)) {
2581                         NL_SET_BAD_ATTR(extack, attr);
2582                         return -EEXIST;
2583                 }
2584
2585                 basechain = nft_base_chain(chain);
2586                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2587                                            ctx->family, flags, extack);
2588                 if (err < 0)
2589                         return err;
2590
2591                 if (basechain->type != hook.type) {
2592                         nft_chain_release_hook(&hook);
2593                         NL_SET_BAD_ATTR(extack, attr);
2594                         return -EEXIST;
2595                 }
2596
2597                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2598                         list_for_each_entry_safe(h, next, &hook.list, list) {
2599                                 h->ops.pf       = basechain->ops.pf;
2600                                 h->ops.hooknum  = basechain->ops.hooknum;
2601                                 h->ops.priority = basechain->ops.priority;
2602                                 h->ops.priv     = basechain->ops.priv;
2603                                 h->ops.hook     = basechain->ops.hook;
2604
2605                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2606                                         list_del(&h->list);
2607                                         kfree(h);
2608                                 }
2609                         }
2610                 } else {
2611                         ops = &basechain->ops;
2612                         if (ops->hooknum != hook.num ||
2613                             ops->priority != hook.priority) {
2614                                 nft_chain_release_hook(&hook);
2615                                 NL_SET_BAD_ATTR(extack, attr);
2616                                 return -EEXIST;
2617                         }
2618                 }
2619         }
2620
2621         if (nla[NFTA_CHAIN_HANDLE] &&
2622             nla[NFTA_CHAIN_NAME]) {
2623                 struct nft_chain *chain2;
2624
2625                 chain2 = nft_chain_lookup(ctx->net, table,
2626                                           nla[NFTA_CHAIN_NAME], genmask);
2627                 if (!IS_ERR(chain2)) {
2628                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2629                         err = -EEXIST;
2630                         goto err_hooks;
2631                 }
2632         }
2633
2634         if (nla[NFTA_CHAIN_COUNTERS]) {
2635                 if (!nft_is_base_chain(chain)) {
2636                         err = -EOPNOTSUPP;
2637                         goto err_hooks;
2638                 }
2639
2640                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2641                 if (IS_ERR(stats)) {
2642                         err = PTR_ERR(stats);
2643                         goto err_hooks;
2644                 }
2645         }
2646
2647         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2648             nft_is_base_chain(chain) &&
2649             !list_empty(&hook.list)) {
2650                 basechain = nft_base_chain(chain);
2651                 ops = &basechain->ops;
2652
2653                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2654                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2655                         if (err < 0)
2656                                 goto err_hooks;
2657                 }
2658         }
2659
2660         unregister = true;
2661         err = -ENOMEM;
2662         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2663                                 sizeof(struct nft_trans_chain));
2664         if (trans == NULL)
2665                 goto err_trans;
2666
2667         nft_trans_chain_stats(trans) = stats;
2668         nft_trans_chain_update(trans) = true;
2669
2670         if (nla[NFTA_CHAIN_POLICY])
2671                 nft_trans_chain_policy(trans) = policy;
2672         else
2673                 nft_trans_chain_policy(trans) = -1;
2674
2675         if (nla[NFTA_CHAIN_HANDLE] &&
2676             nla[NFTA_CHAIN_NAME]) {
2677                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2678                 struct nft_trans *tmp;
2679                 char *name;
2680
2681                 err = -ENOMEM;
2682                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2683                 if (!name)
2684                         goto err_trans;
2685
2686                 err = -EEXIST;
2687                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2688                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2689                             tmp->ctx.table == table &&
2690                             nft_trans_chain_update(tmp) &&
2691                             nft_trans_chain_name(tmp) &&
2692                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2693                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2694                                 kfree(name);
2695                                 goto err_trans;
2696                         }
2697                 }
2698
2699                 nft_trans_chain_name(trans) = name;
2700         }
2701
2702         nft_trans_basechain(trans) = basechain;
2703         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2704         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2705         if (nla[NFTA_CHAIN_HOOK])
2706                 module_put(hook.type->owner);
2707
2708         nft_trans_commit_list_add_tail(ctx->net, trans);
2709
2710         return 0;
2711
2712 err_trans:
2713         free_percpu(stats);
2714         kfree(trans);
2715 err_hooks:
2716         if (nla[NFTA_CHAIN_HOOK]) {
2717                 list_for_each_entry_safe(h, next, &hook.list, list) {
2718                         if (unregister)
2719                                 nf_unregister_net_hook(ctx->net, &h->ops);
2720                         list_del(&h->list);
2721                         kfree_rcu(h, rcu);
2722                 }
2723                 module_put(hook.type->owner);
2724         }
2725
2726         return err;
2727 }
2728
2729 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2730                                                const struct nft_table *table,
2731                                                const struct nlattr *nla, u8 genmask)
2732 {
2733         struct nftables_pernet *nft_net = nft_pernet(net);
2734         u32 id = ntohl(nla_get_be32(nla));
2735         struct nft_trans *trans;
2736
2737         list_for_each_entry(trans, &nft_net->commit_list, list) {
2738                 struct nft_chain *chain = trans->ctx.chain;
2739
2740                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2741                     chain->table == table &&
2742                     id == nft_trans_chain_id(trans) &&
2743                     nft_active_genmask(chain, genmask))
2744                         return chain;
2745         }
2746         return ERR_PTR(-ENOENT);
2747 }
2748
2749 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2750                               const struct nlattr * const nla[])
2751 {
2752         struct nftables_pernet *nft_net = nft_pernet(info->net);
2753         struct netlink_ext_ack *extack = info->extack;
2754         u8 genmask = nft_genmask_next(info->net);
2755         u8 family = info->nfmsg->nfgen_family;
2756         struct nft_chain *chain = NULL;
2757         struct net *net = info->net;
2758         const struct nlattr *attr;
2759         struct nft_table *table;
2760         u8 policy = NF_ACCEPT;
2761         struct nft_ctx ctx;
2762         u64 handle = 0;
2763         u32 flags = 0;
2764
2765         lockdep_assert_held(&nft_net->commit_mutex);
2766
2767         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2768                                  NETLINK_CB(skb).portid);
2769         if (IS_ERR(table)) {
2770                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2771                 return PTR_ERR(table);
2772         }
2773
2774         chain = NULL;
2775         attr = nla[NFTA_CHAIN_NAME];
2776
2777         if (nla[NFTA_CHAIN_HANDLE]) {
2778                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2779                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2780                 if (IS_ERR(chain)) {
2781                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2782                         return PTR_ERR(chain);
2783                 }
2784                 attr = nla[NFTA_CHAIN_HANDLE];
2785         } else if (nla[NFTA_CHAIN_NAME]) {
2786                 chain = nft_chain_lookup(net, table, attr, genmask);
2787                 if (IS_ERR(chain)) {
2788                         if (PTR_ERR(chain) != -ENOENT) {
2789                                 NL_SET_BAD_ATTR(extack, attr);
2790                                 return PTR_ERR(chain);
2791                         }
2792                         chain = NULL;
2793                 }
2794         } else if (!nla[NFTA_CHAIN_ID]) {
2795                 return -EINVAL;
2796         }
2797
2798         if (nla[NFTA_CHAIN_POLICY]) {
2799                 if (chain != NULL &&
2800                     !nft_is_base_chain(chain)) {
2801                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2802                         return -EOPNOTSUPP;
2803                 }
2804
2805                 if (chain == NULL &&
2806                     nla[NFTA_CHAIN_HOOK] == NULL) {
2807                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2808                         return -EOPNOTSUPP;
2809                 }
2810
2811                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2812                 switch (policy) {
2813                 case NF_DROP:
2814                 case NF_ACCEPT:
2815                         break;
2816                 default:
2817                         return -EINVAL;
2818                 }
2819         }
2820
2821         if (nla[NFTA_CHAIN_FLAGS])
2822                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2823         else if (chain)
2824                 flags = chain->flags;
2825
2826         if (flags & ~NFT_CHAIN_FLAGS)
2827                 return -EOPNOTSUPP;
2828
2829         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2830
2831         if (chain != NULL) {
2832                 if (chain->flags & NFT_CHAIN_BINDING)
2833                         return -EINVAL;
2834
2835                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2836                         NL_SET_BAD_ATTR(extack, attr);
2837                         return -EEXIST;
2838                 }
2839                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2840                         return -EOPNOTSUPP;
2841
2842                 flags |= chain->flags & NFT_CHAIN_BASE;
2843                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2844                                           extack);
2845         }
2846
2847         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2848 }
2849
2850 static int nft_delchain_hook(struct nft_ctx *ctx,
2851                              struct nft_base_chain *basechain,
2852                              struct netlink_ext_ack *extack)
2853 {
2854         const struct nft_chain *chain = &basechain->chain;
2855         const struct nlattr * const *nla = ctx->nla;
2856         struct nft_chain_hook chain_hook = {};
2857         struct nft_hook *this, *hook;
2858         LIST_HEAD(chain_del_list);
2859         struct nft_trans *trans;
2860         int err;
2861
2862         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2863                                    ctx->family, chain->flags, extack);
2864         if (err < 0)
2865                 return err;
2866
2867         list_for_each_entry(this, &chain_hook.list, list) {
2868                 hook = nft_hook_list_find(&basechain->hook_list, this);
2869                 if (!hook) {
2870                         err = -ENOENT;
2871                         goto err_chain_del_hook;
2872                 }
2873                 list_move(&hook->list, &chain_del_list);
2874         }
2875
2876         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2877                                 sizeof(struct nft_trans_chain));
2878         if (!trans) {
2879                 err = -ENOMEM;
2880                 goto err_chain_del_hook;
2881         }
2882
2883         nft_trans_basechain(trans) = basechain;
2884         nft_trans_chain_update(trans) = true;
2885         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2886         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2887         nft_chain_release_hook(&chain_hook);
2888
2889         nft_trans_commit_list_add_tail(ctx->net, trans);
2890
2891         return 0;
2892
2893 err_chain_del_hook:
2894         list_splice(&chain_del_list, &basechain->hook_list);
2895         nft_chain_release_hook(&chain_hook);
2896
2897         return err;
2898 }
2899
2900 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2901                               const struct nlattr * const nla[])
2902 {
2903         struct netlink_ext_ack *extack = info->extack;
2904         u8 genmask = nft_genmask_next(info->net);
2905         u8 family = info->nfmsg->nfgen_family;
2906         struct net *net = info->net;
2907         const struct nlattr *attr;
2908         struct nft_table *table;
2909         struct nft_chain *chain;
2910         struct nft_rule *rule;
2911         struct nft_ctx ctx;
2912         u64 handle;
2913         u32 use;
2914         int err;
2915
2916         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2917                                  NETLINK_CB(skb).portid);
2918         if (IS_ERR(table)) {
2919                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2920                 return PTR_ERR(table);
2921         }
2922
2923         if (nla[NFTA_CHAIN_HANDLE]) {
2924                 attr = nla[NFTA_CHAIN_HANDLE];
2925                 handle = be64_to_cpu(nla_get_be64(attr));
2926                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2927         } else {
2928                 attr = nla[NFTA_CHAIN_NAME];
2929                 chain = nft_chain_lookup(net, table, attr, genmask);
2930         }
2931         if (IS_ERR(chain)) {
2932                 if (PTR_ERR(chain) == -ENOENT &&
2933                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2934                         return 0;
2935
2936                 NL_SET_BAD_ATTR(extack, attr);
2937                 return PTR_ERR(chain);
2938         }
2939
2940         if (nft_chain_binding(chain))
2941                 return -EOPNOTSUPP;
2942
2943         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2944
2945         if (nla[NFTA_CHAIN_HOOK]) {
2946                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2947                         return -EOPNOTSUPP;
2948
2949                 if (nft_is_base_chain(chain)) {
2950                         struct nft_base_chain *basechain = nft_base_chain(chain);
2951
2952                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2953                                 return nft_delchain_hook(&ctx, basechain, extack);
2954                 }
2955         }
2956
2957         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2958             chain->use > 0)
2959                 return -EBUSY;
2960
2961         use = chain->use;
2962         list_for_each_entry(rule, &chain->rules, list) {
2963                 if (!nft_is_active_next(net, rule))
2964                         continue;
2965                 use--;
2966
2967                 err = nft_delrule(&ctx, rule);
2968                 if (err < 0)
2969                         return err;
2970         }
2971
2972         /* There are rules and elements that are still holding references to us,
2973          * we cannot do a recursive removal in this case.
2974          */
2975         if (use > 0) {
2976                 NL_SET_BAD_ATTR(extack, attr);
2977                 return -EBUSY;
2978         }
2979
2980         return nft_delchain(&ctx);
2981 }
2982
2983 /*
2984  * Expressions
2985  */
2986
2987 /**
2988  *      nft_register_expr - register nf_tables expr type
2989  *      @type: expr type
2990  *
2991  *      Registers the expr type for use with nf_tables. Returns zero on
2992  *      success or a negative errno code otherwise.
2993  */
2994 int nft_register_expr(struct nft_expr_type *type)
2995 {
2996         if (WARN_ON_ONCE(type->maxattr > NFT_EXPR_MAXATTR))
2997                 return -ENOMEM;
2998
2999         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3000         if (type->family == NFPROTO_UNSPEC)
3001                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
3002         else
3003                 list_add_rcu(&type->list, &nf_tables_expressions);
3004         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3005         return 0;
3006 }
3007 EXPORT_SYMBOL_GPL(nft_register_expr);
3008
3009 /**
3010  *      nft_unregister_expr - unregister nf_tables expr type
3011  *      @type: expr type
3012  *
3013  *      Unregisters the expr typefor use with nf_tables.
3014  */
3015 void nft_unregister_expr(struct nft_expr_type *type)
3016 {
3017         nfnl_lock(NFNL_SUBSYS_NFTABLES);
3018         list_del_rcu(&type->list);
3019         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3020 }
3021 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3022
3023 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3024                                                        struct nlattr *nla)
3025 {
3026         const struct nft_expr_type *type, *candidate = NULL;
3027
3028         list_for_each_entry(type, &nf_tables_expressions, list) {
3029                 if (!nla_strcmp(nla, type->name)) {
3030                         if (!type->family && !candidate)
3031                                 candidate = type;
3032                         else if (type->family == family)
3033                                 candidate = type;
3034                 }
3035         }
3036         return candidate;
3037 }
3038
3039 #ifdef CONFIG_MODULES
3040 static int nft_expr_type_request_module(struct net *net, u8 family,
3041                                         struct nlattr *nla)
3042 {
3043         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3044                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3045                 return -EAGAIN;
3046
3047         return 0;
3048 }
3049 #endif
3050
3051 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3052                                                      u8 family,
3053                                                      struct nlattr *nla)
3054 {
3055         const struct nft_expr_type *type;
3056
3057         if (nla == NULL)
3058                 return ERR_PTR(-EINVAL);
3059
3060         type = __nft_expr_type_get(family, nla);
3061         if (type != NULL && try_module_get(type->owner))
3062                 return type;
3063
3064         lockdep_nfnl_nft_mutex_not_held();
3065 #ifdef CONFIG_MODULES
3066         if (type == NULL) {
3067                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3068                         return ERR_PTR(-EAGAIN);
3069
3070                 if (nft_request_module(net, "nft-expr-%.*s",
3071                                        nla_len(nla),
3072                                        (char *)nla_data(nla)) == -EAGAIN)
3073                         return ERR_PTR(-EAGAIN);
3074         }
3075 #endif
3076         return ERR_PTR(-ENOENT);
3077 }
3078
3079 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3080         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3081                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3082         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3083 };
3084
3085 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3086                                     const struct nft_expr *expr, bool reset)
3087 {
3088         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3089                 goto nla_put_failure;
3090
3091         if (expr->ops->dump) {
3092                 struct nlattr *data = nla_nest_start_noflag(skb,
3093                                                             NFTA_EXPR_DATA);
3094                 if (data == NULL)
3095                         goto nla_put_failure;
3096                 if (expr->ops->dump(skb, expr, reset) < 0)
3097                         goto nla_put_failure;
3098                 nla_nest_end(skb, data);
3099         }
3100
3101         return skb->len;
3102
3103 nla_put_failure:
3104         return -1;
3105 };
3106
3107 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3108                   const struct nft_expr *expr, bool reset)
3109 {
3110         struct nlattr *nest;
3111
3112         nest = nla_nest_start_noflag(skb, attr);
3113         if (!nest)
3114                 goto nla_put_failure;
3115         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3116                 goto nla_put_failure;
3117         nla_nest_end(skb, nest);
3118         return 0;
3119
3120 nla_put_failure:
3121         return -1;
3122 }
3123
3124 struct nft_expr_info {
3125         const struct nft_expr_ops       *ops;
3126         const struct nlattr             *attr;
3127         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3128 };
3129
3130 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3131                                 const struct nlattr *nla,
3132                                 struct nft_expr_info *info)
3133 {
3134         const struct nft_expr_type *type;
3135         const struct nft_expr_ops *ops;
3136         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3137         int err;
3138
3139         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3140                                           nft_expr_policy, NULL);
3141         if (err < 0)
3142                 return err;
3143
3144         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3145         if (IS_ERR(type))
3146                 return PTR_ERR(type);
3147
3148         if (tb[NFTA_EXPR_DATA]) {
3149                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3150                                                   tb[NFTA_EXPR_DATA],
3151                                                   type->policy, NULL);
3152                 if (err < 0)
3153                         goto err1;
3154         } else
3155                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3156
3157         if (type->select_ops != NULL) {
3158                 ops = type->select_ops(ctx,
3159                                        (const struct nlattr * const *)info->tb);
3160                 if (IS_ERR(ops)) {
3161                         err = PTR_ERR(ops);
3162 #ifdef CONFIG_MODULES
3163                         if (err == -EAGAIN)
3164                                 if (nft_expr_type_request_module(ctx->net,
3165                                                                  ctx->family,
3166                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3167                                         err = -ENOENT;
3168 #endif
3169                         goto err1;
3170                 }
3171         } else
3172                 ops = type->ops;
3173
3174         info->attr = nla;
3175         info->ops = ops;
3176
3177         return 0;
3178
3179 err1:
3180         module_put(type->owner);
3181         return err;
3182 }
3183
3184 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3185                          struct nft_expr_info *info)
3186 {
3187         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3188         const struct nft_expr_type *type;
3189         int err;
3190
3191         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3192                                           nft_expr_policy, NULL);
3193         if (err < 0)
3194                 return err;
3195
3196         if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3197                 return -EINVAL;
3198
3199         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3200         if (!type)
3201                 return -ENOENT;
3202
3203         if (!type->inner_ops)
3204                 return -EOPNOTSUPP;
3205
3206         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3207                                           tb[NFTA_EXPR_DATA],
3208                                           type->policy, NULL);
3209         if (err < 0)
3210                 goto err_nla_parse;
3211
3212         info->attr = nla;
3213         info->ops = type->inner_ops;
3214
3215         return 0;
3216
3217 err_nla_parse:
3218         return err;
3219 }
3220
3221 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3222                              const struct nft_expr_info *expr_info,
3223                              struct nft_expr *expr)
3224 {
3225         const struct nft_expr_ops *ops = expr_info->ops;
3226         int err;
3227
3228         expr->ops = ops;
3229         if (ops->init) {
3230                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3231                 if (err < 0)
3232                         goto err1;
3233         }
3234
3235         return 0;
3236 err1:
3237         expr->ops = NULL;
3238         return err;
3239 }
3240
3241 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3242                                    struct nft_expr *expr)
3243 {
3244         const struct nft_expr_type *type = expr->ops->type;
3245
3246         if (expr->ops->destroy)
3247                 expr->ops->destroy(ctx, expr);
3248         module_put(type->owner);
3249 }
3250
3251 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3252                                       const struct nlattr *nla)
3253 {
3254         struct nft_expr_info expr_info;
3255         struct nft_expr *expr;
3256         struct module *owner;
3257         int err;
3258
3259         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3260         if (err < 0)
3261                 goto err_expr_parse;
3262
3263         err = -EOPNOTSUPP;
3264         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3265                 goto err_expr_stateful;
3266
3267         err = -ENOMEM;
3268         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3269         if (expr == NULL)
3270                 goto err_expr_stateful;
3271
3272         err = nf_tables_newexpr(ctx, &expr_info, expr);
3273         if (err < 0)
3274                 goto err_expr_new;
3275
3276         return expr;
3277 err_expr_new:
3278         kfree(expr);
3279 err_expr_stateful:
3280         owner = expr_info.ops->type->owner;
3281         if (expr_info.ops->type->release_ops)
3282                 expr_info.ops->type->release_ops(expr_info.ops);
3283
3284         module_put(owner);
3285 err_expr_parse:
3286         return ERR_PTR(err);
3287 }
3288
3289 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3290 {
3291         int err;
3292
3293         if (WARN_ON_ONCE(!src->ops->clone))
3294                 return -EINVAL;
3295
3296         dst->ops = src->ops;
3297         err = src->ops->clone(dst, src);
3298         if (err < 0)
3299                 return err;
3300
3301         __module_get(src->ops->type->owner);
3302
3303         return 0;
3304 }
3305
3306 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3307 {
3308         nf_tables_expr_destroy(ctx, expr);
3309         kfree(expr);
3310 }
3311
3312 /*
3313  * Rules
3314  */
3315
3316 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3317                                           u64 handle)
3318 {
3319         struct nft_rule *rule;
3320
3321         // FIXME: this sucks
3322         list_for_each_entry_rcu(rule, &chain->rules, list) {
3323                 if (handle == rule->handle)
3324                         return rule;
3325         }
3326
3327         return ERR_PTR(-ENOENT);
3328 }
3329
3330 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3331                                         const struct nlattr *nla)
3332 {
3333         if (nla == NULL)
3334                 return ERR_PTR(-EINVAL);
3335
3336         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3337 }
3338
3339 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3340         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3341                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3342         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3343                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3344         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3345         [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3346         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3347         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3348         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3349                                     .len = NFT_USERDATA_MAXLEN },
3350         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3351         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3352         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3353 };
3354
3355 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3356                                     u32 portid, u32 seq, int event,
3357                                     u32 flags, int family,
3358                                     const struct nft_table *table,
3359                                     const struct nft_chain *chain,
3360                                     const struct nft_rule *rule, u64 handle,
3361                                     bool reset)
3362 {
3363         struct nlmsghdr *nlh;
3364         const struct nft_expr *expr, *next;
3365         struct nlattr *list;
3366         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3367
3368         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3369                            nft_base_seq(net));
3370         if (!nlh)
3371                 goto nla_put_failure;
3372
3373         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3374                 goto nla_put_failure;
3375         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3376                 goto nla_put_failure;
3377         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3378                          NFTA_RULE_PAD))
3379                 goto nla_put_failure;
3380
3381         if (event != NFT_MSG_DELRULE && handle) {
3382                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3383                                  NFTA_RULE_PAD))
3384                         goto nla_put_failure;
3385         }
3386
3387         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3388                 nft_flow_rule_stats(chain, rule);
3389
3390         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3391         if (list == NULL)
3392                 goto nla_put_failure;
3393         nft_rule_for_each_expr(expr, next, rule) {
3394                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3395                         goto nla_put_failure;
3396         }
3397         nla_nest_end(skb, list);
3398
3399         if (rule->udata) {
3400                 struct nft_userdata *udata = nft_userdata(rule);
3401                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3402                             udata->data) < 0)
3403                         goto nla_put_failure;
3404         }
3405
3406         nlmsg_end(skb, nlh);
3407         return 0;
3408
3409 nla_put_failure:
3410         nlmsg_trim(skb, nlh);
3411         return -1;
3412 }
3413
3414 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3415                                   const struct nft_rule *rule, int event)
3416 {
3417         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3418         const struct nft_rule *prule;
3419         struct sk_buff *skb;
3420         u64 handle = 0;
3421         u16 flags = 0;
3422         int err;
3423
3424         if (!ctx->report &&
3425             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3426                 return;
3427
3428         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3429         if (skb == NULL)
3430                 goto err;
3431
3432         if (event == NFT_MSG_NEWRULE &&
3433             !list_is_first(&rule->list, &ctx->chain->rules) &&
3434             !list_is_last(&rule->list, &ctx->chain->rules)) {
3435                 prule = list_prev_entry(rule, list);
3436                 handle = prule->handle;
3437         }
3438         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3439                 flags |= NLM_F_APPEND;
3440         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3441                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3442
3443         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3444                                        event, flags, ctx->family, ctx->table,
3445                                        ctx->chain, rule, handle, false);
3446         if (err < 0) {
3447                 kfree_skb(skb);
3448                 goto err;
3449         }
3450
3451         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3452         return;
3453 err:
3454         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3455 }
3456
3457 static void audit_log_rule_reset(const struct nft_table *table,
3458                                  unsigned int base_seq,
3459                                  unsigned int nentries)
3460 {
3461         char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3462                               table->name, base_seq);
3463
3464         audit_log_nfcfg(buf, table->family, nentries,
3465                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3466         kfree(buf);
3467 }
3468
3469 struct nft_rule_dump_ctx {
3470         unsigned int s_idx;
3471         char *table;
3472         char *chain;
3473         bool reset;
3474 };
3475
3476 static int __nf_tables_dump_rules(struct sk_buff *skb,
3477                                   unsigned int *idx,
3478                                   struct netlink_callback *cb,
3479                                   const struct nft_table *table,
3480                                   const struct nft_chain *chain)
3481 {
3482         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3483         struct net *net = sock_net(skb->sk);
3484         const struct nft_rule *rule, *prule;
3485         unsigned int entries = 0;
3486         int ret = 0;
3487         u64 handle;
3488
3489         prule = NULL;
3490         list_for_each_entry_rcu(rule, &chain->rules, list) {
3491                 if (!nft_is_active(net, rule))
3492                         goto cont_skip;
3493                 if (*idx < ctx->s_idx)
3494                         goto cont;
3495                 if (prule)
3496                         handle = prule->handle;
3497                 else
3498                         handle = 0;
3499
3500                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3501                                         cb->nlh->nlmsg_seq,
3502                                         NFT_MSG_NEWRULE,
3503                                         NLM_F_MULTI | NLM_F_APPEND,
3504                                         table->family,
3505                                         table, chain, rule, handle, ctx->reset) < 0) {
3506                         ret = 1;
3507                         break;
3508                 }
3509                 entries++;
3510                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3511 cont:
3512                 prule = rule;
3513 cont_skip:
3514                 (*idx)++;
3515         }
3516
3517         if (ctx->reset && entries)
3518                 audit_log_rule_reset(table, cb->seq, entries);
3519
3520         return ret;
3521 }
3522
3523 static int nf_tables_dump_rules(struct sk_buff *skb,
3524                                 struct netlink_callback *cb)
3525 {
3526         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3527         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3528         struct nft_table *table;
3529         const struct nft_chain *chain;
3530         unsigned int idx = 0;
3531         struct net *net = sock_net(skb->sk);
3532         int family = nfmsg->nfgen_family;
3533         struct nftables_pernet *nft_net;
3534
3535         rcu_read_lock();
3536         nft_net = nft_pernet(net);
3537         cb->seq = READ_ONCE(nft_net->base_seq);
3538
3539         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3540                 if (family != NFPROTO_UNSPEC && family != table->family)
3541                         continue;
3542
3543                 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3544                         continue;
3545
3546                 if (ctx->table && ctx->chain) {
3547                         struct rhlist_head *list, *tmp;
3548
3549                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3550                                                nft_chain_ht_params);
3551                         if (!list)
3552                                 goto done;
3553
3554                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3555                                 if (!nft_is_active(net, chain))
3556                                         continue;
3557                                 __nf_tables_dump_rules(skb, &idx,
3558                                                        cb, table, chain);
3559                                 break;
3560                         }
3561                         goto done;
3562                 }
3563
3564                 list_for_each_entry_rcu(chain, &table->chains, list) {
3565                         if (__nf_tables_dump_rules(skb, &idx,
3566                                                    cb, table, chain))
3567                                 goto done;
3568                 }
3569
3570                 if (ctx->table)
3571                         break;
3572         }
3573 done:
3574         rcu_read_unlock();
3575
3576         ctx->s_idx = idx;
3577         return skb->len;
3578 }
3579
3580 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3581                                      struct netlink_callback *cb)
3582 {
3583         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3584         int ret;
3585
3586         /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3587          * do not underrun counters and quotas. The commit_mutex is used for
3588          * the lack a better lock, this is not transaction path.
3589          */
3590         mutex_lock(&nft_net->commit_mutex);
3591         ret = nf_tables_dump_rules(skb, cb);
3592         mutex_unlock(&nft_net->commit_mutex);
3593
3594         return ret;
3595 }
3596
3597 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3598 {
3599         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3600         const struct nlattr * const *nla = cb->data;
3601
3602         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3603
3604         if (nla[NFTA_RULE_TABLE]) {
3605                 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3606                 if (!ctx->table)
3607                         return -ENOMEM;
3608         }
3609         if (nla[NFTA_RULE_CHAIN]) {
3610                 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3611                 if (!ctx->chain) {
3612                         kfree(ctx->table);
3613                         return -ENOMEM;
3614                 }
3615         }
3616         return 0;
3617 }
3618
3619 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3620 {
3621         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3622
3623         ctx->reset = true;
3624
3625         return nf_tables_dump_rules_start(cb);
3626 }
3627
3628 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3629 {
3630         struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3631
3632         kfree(ctx->table);
3633         kfree(ctx->chain);
3634         return 0;
3635 }
3636
3637 /* called with rcu_read_lock held */
3638 static struct sk_buff *
3639 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3640                          const struct nlattr * const nla[], bool reset)
3641 {
3642         struct netlink_ext_ack *extack = info->extack;
3643         u8 genmask = nft_genmask_cur(info->net);
3644         u8 family = info->nfmsg->nfgen_family;
3645         const struct nft_chain *chain;
3646         const struct nft_rule *rule;
3647         struct net *net = info->net;
3648         struct nft_table *table;
3649         struct sk_buff *skb2;
3650         int err;
3651
3652         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3653         if (IS_ERR(table)) {
3654                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3655                 return ERR_CAST(table);
3656         }
3657
3658         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3659         if (IS_ERR(chain)) {
3660                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3661                 return ERR_CAST(chain);
3662         }
3663
3664         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3665         if (IS_ERR(rule)) {
3666                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3667                 return ERR_CAST(rule);
3668         }
3669
3670         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3671         if (!skb2)
3672                 return ERR_PTR(-ENOMEM);
3673
3674         err = nf_tables_fill_rule_info(skb2, net, portid,
3675                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3676                                        family, table, chain, rule, 0, reset);
3677         if (err < 0) {
3678                 kfree_skb(skb2);
3679                 return ERR_PTR(err);
3680         }
3681
3682         return skb2;
3683 }
3684
3685 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3686                              const struct nlattr * const nla[])
3687 {
3688         u32 portid = NETLINK_CB(skb).portid;
3689         struct net *net = info->net;
3690         struct sk_buff *skb2;
3691
3692         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3693                 struct netlink_dump_control c = {
3694                         .start= nf_tables_dump_rules_start,
3695                         .dump = nf_tables_dump_rules,
3696                         .done = nf_tables_dump_rules_done,
3697                         .module = THIS_MODULE,
3698                         .data = (void *)nla,
3699                 };
3700
3701                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3702         }
3703
3704         skb2 = nf_tables_getrule_single(portid, info, nla, false);
3705         if (IS_ERR(skb2))
3706                 return PTR_ERR(skb2);
3707
3708         return nfnetlink_unicast(skb2, net, portid);
3709 }
3710
3711 static int nf_tables_getrule_reset(struct sk_buff *skb,
3712                                    const struct nfnl_info *info,
3713                                    const struct nlattr * const nla[])
3714 {
3715         struct nftables_pernet *nft_net = nft_pernet(info->net);
3716         u32 portid = NETLINK_CB(skb).portid;
3717         struct net *net = info->net;
3718         struct sk_buff *skb2;
3719         char *buf;
3720
3721         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3722                 struct netlink_dump_control c = {
3723                         .start= nf_tables_dumpreset_rules_start,
3724                         .dump = nf_tables_dumpreset_rules,
3725                         .done = nf_tables_dump_rules_done,
3726                         .module = THIS_MODULE,
3727                         .data = (void *)nla,
3728                 };
3729
3730                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3731         }
3732
3733         if (!try_module_get(THIS_MODULE))
3734                 return -EINVAL;
3735         rcu_read_unlock();
3736         mutex_lock(&nft_net->commit_mutex);
3737         skb2 = nf_tables_getrule_single(portid, info, nla, true);
3738         mutex_unlock(&nft_net->commit_mutex);
3739         rcu_read_lock();
3740         module_put(THIS_MODULE);
3741
3742         if (IS_ERR(skb2))
3743                 return PTR_ERR(skb2);
3744
3745         buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3746                         nla_len(nla[NFTA_RULE_TABLE]),
3747                         (char *)nla_data(nla[NFTA_RULE_TABLE]),
3748                         nft_net->base_seq);
3749         audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3750                         AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3751         kfree(buf);
3752
3753         return nfnetlink_unicast(skb2, net, portid);
3754 }
3755
3756 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3757 {
3758         struct nft_expr *expr, *next;
3759
3760         /*
3761          * Careful: some expressions might not be initialized in case this
3762          * is called on error from nf_tables_newrule().
3763          */
3764         expr = nft_expr_first(rule);
3765         while (nft_expr_more(rule, expr)) {
3766                 next = nft_expr_next(expr);
3767                 nf_tables_expr_destroy(ctx, expr);
3768                 expr = next;
3769         }
3770         kfree(rule);
3771 }
3772
3773 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3774 {
3775         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3776         nf_tables_rule_destroy(ctx, rule);
3777 }
3778
3779 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3780 {
3781         struct nft_expr *expr, *last;
3782         const struct nft_data *data;
3783         struct nft_rule *rule;
3784         int err;
3785
3786         if (ctx->level == NFT_JUMP_STACK_SIZE)
3787                 return -EMLINK;
3788
3789         list_for_each_entry(rule, &chain->rules, list) {
3790                 if (fatal_signal_pending(current))
3791                         return -EINTR;
3792
3793                 if (!nft_is_active_next(ctx->net, rule))
3794                         continue;
3795
3796                 nft_rule_for_each_expr(expr, last, rule) {
3797                         if (!expr->ops->validate)
3798                                 continue;
3799
3800                         err = expr->ops->validate(ctx, expr, &data);
3801                         if (err < 0)
3802                                 return err;
3803                 }
3804         }
3805
3806         return 0;
3807 }
3808 EXPORT_SYMBOL_GPL(nft_chain_validate);
3809
3810 static int nft_table_validate(struct net *net, const struct nft_table *table)
3811 {
3812         struct nft_chain *chain;
3813         struct nft_ctx ctx = {
3814                 .net    = net,
3815                 .family = table->family,
3816         };
3817         int err;
3818
3819         list_for_each_entry(chain, &table->chains, list) {
3820                 if (!nft_is_base_chain(chain))
3821                         continue;
3822
3823                 ctx.chain = chain;
3824                 err = nft_chain_validate(&ctx, chain);
3825                 if (err < 0)
3826                         return err;
3827
3828                 cond_resched();
3829         }
3830
3831         return 0;
3832 }
3833
3834 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3835                          const struct nft_set_iter *iter,
3836                          struct nft_elem_priv *elem_priv)
3837 {
3838         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
3839         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3840         const struct nft_data *data;
3841         int err;
3842
3843         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3844             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3845                 return 0;
3846
3847         data = nft_set_ext_data(ext);
3848         switch (data->verdict.code) {
3849         case NFT_JUMP:
3850         case NFT_GOTO:
3851                 pctx->level++;
3852                 err = nft_chain_validate(ctx, data->verdict.chain);
3853                 if (err < 0)
3854                         return err;
3855                 pctx->level--;
3856                 break;
3857         default:
3858                 break;
3859         }
3860
3861         return 0;
3862 }
3863
3864 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3865 {
3866         u8 genmask = nft_genmask_next(ctx->net);
3867         struct nft_set_elem_catchall *catchall;
3868         struct nft_set_ext *ext;
3869         int ret = 0;
3870
3871         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3872                 ext = nft_set_elem_ext(set, catchall->elem);
3873                 if (!nft_set_elem_active(ext, genmask))
3874                         continue;
3875
3876                 ret = nft_setelem_validate(ctx, set, NULL, catchall->elem);
3877                 if (ret < 0)
3878                         return ret;
3879         }
3880
3881         return ret;
3882 }
3883
3884 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3885                                              const struct nft_chain *chain,
3886                                              const struct nlattr *nla);
3887
3888 #define NFT_RULE_MAXEXPRS       128
3889
3890 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3891                              const struct nlattr * const nla[])
3892 {
3893         struct nftables_pernet *nft_net = nft_pernet(info->net);
3894         struct netlink_ext_ack *extack = info->extack;
3895         unsigned int size, i, n, ulen = 0, usize = 0;
3896         u8 genmask = nft_genmask_next(info->net);
3897         struct nft_rule *rule, *old_rule = NULL;
3898         struct nft_expr_info *expr_info = NULL;
3899         u8 family = info->nfmsg->nfgen_family;
3900         struct nft_flow_rule *flow = NULL;
3901         struct net *net = info->net;
3902         struct nft_userdata *udata;
3903         struct nft_table *table;
3904         struct nft_chain *chain;
3905         struct nft_trans *trans;
3906         u64 handle, pos_handle;
3907         struct nft_expr *expr;
3908         struct nft_ctx ctx;
3909         struct nlattr *tmp;
3910         int err, rem;
3911
3912         lockdep_assert_held(&nft_net->commit_mutex);
3913
3914         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3915                                  NETLINK_CB(skb).portid);
3916         if (IS_ERR(table)) {
3917                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3918                 return PTR_ERR(table);
3919         }
3920
3921         if (nla[NFTA_RULE_CHAIN]) {
3922                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3923                                          genmask);
3924                 if (IS_ERR(chain)) {
3925                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3926                         return PTR_ERR(chain);
3927                 }
3928
3929         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3930                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3931                                               genmask);
3932                 if (IS_ERR(chain)) {
3933                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3934                         return PTR_ERR(chain);
3935                 }
3936         } else {
3937                 return -EINVAL;
3938         }
3939
3940         if (nft_chain_is_bound(chain))
3941                 return -EOPNOTSUPP;
3942
3943         if (nla[NFTA_RULE_HANDLE]) {
3944                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3945                 rule = __nft_rule_lookup(chain, handle);
3946                 if (IS_ERR(rule)) {
3947                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3948                         return PTR_ERR(rule);
3949                 }
3950
3951                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3952                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3953                         return -EEXIST;
3954                 }
3955                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3956                         old_rule = rule;
3957                 else
3958                         return -EOPNOTSUPP;
3959         } else {
3960                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3961                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3962                         return -EINVAL;
3963                 handle = nf_tables_alloc_handle(table);
3964
3965                 if (nla[NFTA_RULE_POSITION]) {
3966                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3967                         old_rule = __nft_rule_lookup(chain, pos_handle);
3968                         if (IS_ERR(old_rule)) {
3969                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3970                                 return PTR_ERR(old_rule);
3971                         }
3972                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3973                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3974                         if (IS_ERR(old_rule)) {
3975                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3976                                 return PTR_ERR(old_rule);
3977                         }
3978                 }
3979         }
3980
3981         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3982
3983         n = 0;
3984         size = 0;
3985         if (nla[NFTA_RULE_EXPRESSIONS]) {
3986                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3987                                            sizeof(struct nft_expr_info),
3988                                            GFP_KERNEL);
3989                 if (!expr_info)
3990                         return -ENOMEM;
3991
3992                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3993                         err = -EINVAL;
3994                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3995                                 goto err_release_expr;
3996                         if (n == NFT_RULE_MAXEXPRS)
3997                                 goto err_release_expr;
3998                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3999                         if (err < 0) {
4000                                 NL_SET_BAD_ATTR(extack, tmp);
4001                                 goto err_release_expr;
4002                         }
4003                         size += expr_info[n].ops->size;
4004                         n++;
4005                 }
4006         }
4007         /* Check for overflow of dlen field */
4008         err = -EFBIG;
4009         if (size >= 1 << 12)
4010                 goto err_release_expr;
4011
4012         if (nla[NFTA_RULE_USERDATA]) {
4013                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
4014                 if (ulen > 0)
4015                         usize = sizeof(struct nft_userdata) + ulen;
4016         }
4017
4018         err = -ENOMEM;
4019         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4020         if (rule == NULL)
4021                 goto err_release_expr;
4022
4023         nft_activate_next(net, rule);
4024
4025         rule->handle = handle;
4026         rule->dlen   = size;
4027         rule->udata  = ulen ? 1 : 0;
4028
4029         if (ulen) {
4030                 udata = nft_userdata(rule);
4031                 udata->len = ulen - 1;
4032                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4033         }
4034
4035         expr = nft_expr_first(rule);
4036         for (i = 0; i < n; i++) {
4037                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4038                 if (err < 0) {
4039                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4040                         goto err_release_rule;
4041                 }
4042
4043                 if (expr_info[i].ops->validate)
4044                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
4045
4046                 expr_info[i].ops = NULL;
4047                 expr = nft_expr_next(expr);
4048         }
4049
4050         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4051                 flow = nft_flow_rule_create(net, rule);
4052                 if (IS_ERR(flow)) {
4053                         err = PTR_ERR(flow);
4054                         goto err_release_rule;
4055                 }
4056         }
4057
4058         if (!nft_use_inc(&chain->use)) {
4059                 err = -EMFILE;
4060                 goto err_release_rule;
4061         }
4062
4063         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4064                 if (nft_chain_binding(chain)) {
4065                         err = -EOPNOTSUPP;
4066                         goto err_destroy_flow_rule;
4067                 }
4068
4069                 err = nft_delrule(&ctx, old_rule);
4070                 if (err < 0)
4071                         goto err_destroy_flow_rule;
4072
4073                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4074                 if (trans == NULL) {
4075                         err = -ENOMEM;
4076                         goto err_destroy_flow_rule;
4077                 }
4078                 list_add_tail_rcu(&rule->list, &old_rule->list);
4079         } else {
4080                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4081                 if (!trans) {
4082                         err = -ENOMEM;
4083                         goto err_destroy_flow_rule;
4084                 }
4085
4086                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4087                         if (old_rule)
4088                                 list_add_rcu(&rule->list, &old_rule->list);
4089                         else
4090                                 list_add_tail_rcu(&rule->list, &chain->rules);
4091                  } else {
4092                         if (old_rule)
4093                                 list_add_tail_rcu(&rule->list, &old_rule->list);
4094                         else
4095                                 list_add_rcu(&rule->list, &chain->rules);
4096                 }
4097         }
4098         kvfree(expr_info);
4099
4100         if (flow)
4101                 nft_trans_flow_rule(trans) = flow;
4102
4103         if (table->validate_state == NFT_VALIDATE_DO)
4104                 return nft_table_validate(net, table);
4105
4106         return 0;
4107
4108 err_destroy_flow_rule:
4109         nft_use_dec_restore(&chain->use);
4110         if (flow)
4111                 nft_flow_rule_destroy(flow);
4112 err_release_rule:
4113         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4114         nf_tables_rule_destroy(&ctx, rule);
4115 err_release_expr:
4116         for (i = 0; i < n; i++) {
4117                 if (expr_info[i].ops) {
4118                         module_put(expr_info[i].ops->type->owner);
4119                         if (expr_info[i].ops->type->release_ops)
4120                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4121                 }
4122         }
4123         kvfree(expr_info);
4124
4125         return err;
4126 }
4127
4128 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4129                                              const struct nft_chain *chain,
4130                                              const struct nlattr *nla)
4131 {
4132         struct nftables_pernet *nft_net = nft_pernet(net);
4133         u32 id = ntohl(nla_get_be32(nla));
4134         struct nft_trans *trans;
4135
4136         list_for_each_entry(trans, &nft_net->commit_list, list) {
4137                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4138                     trans->ctx.chain == chain &&
4139                     id == nft_trans_rule_id(trans))
4140                         return nft_trans_rule(trans);
4141         }
4142         return ERR_PTR(-ENOENT);
4143 }
4144
4145 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4146                              const struct nlattr * const nla[])
4147 {
4148         struct netlink_ext_ack *extack = info->extack;
4149         u8 genmask = nft_genmask_next(info->net);
4150         u8 family = info->nfmsg->nfgen_family;
4151         struct nft_chain *chain = NULL;
4152         struct net *net = info->net;
4153         struct nft_table *table;
4154         struct nft_rule *rule;
4155         struct nft_ctx ctx;
4156         int err = 0;
4157
4158         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4159                                  NETLINK_CB(skb).portid);
4160         if (IS_ERR(table)) {
4161                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4162                 return PTR_ERR(table);
4163         }
4164
4165         if (nla[NFTA_RULE_CHAIN]) {
4166                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4167                                          genmask);
4168                 if (IS_ERR(chain)) {
4169                         if (PTR_ERR(chain) == -ENOENT &&
4170                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4171                                 return 0;
4172
4173                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4174                         return PTR_ERR(chain);
4175                 }
4176                 if (nft_chain_binding(chain))
4177                         return -EOPNOTSUPP;
4178         }
4179
4180         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4181
4182         if (chain) {
4183                 if (nla[NFTA_RULE_HANDLE]) {
4184                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4185                         if (IS_ERR(rule)) {
4186                                 if (PTR_ERR(rule) == -ENOENT &&
4187                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4188                                         return 0;
4189
4190                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4191                                 return PTR_ERR(rule);
4192                         }
4193
4194                         err = nft_delrule(&ctx, rule);
4195                 } else if (nla[NFTA_RULE_ID]) {
4196                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4197                         if (IS_ERR(rule)) {
4198                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4199                                 return PTR_ERR(rule);
4200                         }
4201
4202                         err = nft_delrule(&ctx, rule);
4203                 } else {
4204                         err = nft_delrule_by_chain(&ctx);
4205                 }
4206         } else {
4207                 list_for_each_entry(chain, &table->chains, list) {
4208                         if (!nft_is_active_next(net, chain))
4209                                 continue;
4210                         if (nft_chain_binding(chain))
4211                                 continue;
4212
4213                         ctx.chain = chain;
4214                         err = nft_delrule_by_chain(&ctx);
4215                         if (err < 0)
4216                                 break;
4217                 }
4218         }
4219
4220         return err;
4221 }
4222
4223 /*
4224  * Sets
4225  */
4226 static const struct nft_set_type *nft_set_types[] = {
4227         &nft_set_hash_fast_type,
4228         &nft_set_hash_type,
4229         &nft_set_rhash_type,
4230         &nft_set_bitmap_type,
4231         &nft_set_rbtree_type,
4232 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4233         &nft_set_pipapo_avx2_type,
4234 #endif
4235         &nft_set_pipapo_type,
4236 };
4237
4238 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4239                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4240                                  NFT_SET_EVAL)
4241
4242 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4243 {
4244         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4245 }
4246
4247 /*
4248  * Select a set implementation based on the data characteristics and the
4249  * given policy. The total memory use might not be known if no size is
4250  * given, in that case the amount of memory per element is used.
4251  */
4252 static const struct nft_set_ops *
4253 nft_select_set_ops(const struct nft_ctx *ctx, u32 flags,
4254                    const struct nft_set_desc *desc)
4255 {
4256         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4257         const struct nft_set_ops *ops, *bops;
4258         struct nft_set_estimate est, best;
4259         const struct nft_set_type *type;
4260         int i;
4261
4262         lockdep_assert_held(&nft_net->commit_mutex);
4263         lockdep_nfnl_nft_mutex_not_held();
4264
4265         bops        = NULL;
4266         best.size   = ~0;
4267         best.lookup = ~0;
4268         best.space  = ~0;
4269
4270         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4271                 type = nft_set_types[i];
4272                 ops = &type->ops;
4273
4274                 if (!nft_set_ops_candidate(type, flags))
4275                         continue;
4276                 if (!ops->estimate(desc, flags, &est))
4277                         continue;
4278
4279                 switch (desc->policy) {
4280                 case NFT_SET_POL_PERFORMANCE:
4281                         if (est.lookup < best.lookup)
4282                                 break;
4283                         if (est.lookup == best.lookup &&
4284                             est.space < best.space)
4285                                 break;
4286                         continue;
4287                 case NFT_SET_POL_MEMORY:
4288                         if (!desc->size) {
4289                                 if (est.space < best.space)
4290                                         break;
4291                                 if (est.space == best.space &&
4292                                     est.lookup < best.lookup)
4293                                         break;
4294                         } else if (est.size < best.size || !bops) {
4295                                 break;
4296                         }
4297                         continue;
4298                 default:
4299                         break;
4300                 }
4301
4302                 bops = ops;
4303                 best = est;
4304         }
4305
4306         if (bops != NULL)
4307                 return bops;
4308
4309         return ERR_PTR(-EOPNOTSUPP);
4310 }
4311
4312 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4313         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4314                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4315         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4316                                             .len = NFT_SET_MAXNAMELEN - 1 },
4317         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4318         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4319         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4320         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4321         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4322         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4323         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4324         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4325         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4326         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4327         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4328                                             .len  = NFT_USERDATA_MAXLEN },
4329         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4330         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4331         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4332         [NFTA_SET_EXPRESSIONS]          = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4333 };
4334
4335 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4336         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4337 };
4338
4339 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4340         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4341         [NFTA_SET_DESC_CONCAT]          = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4342 };
4343
4344 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4345                                       const struct nlattr *nla, u8 genmask)
4346 {
4347         struct nft_set *set;
4348
4349         if (nla == NULL)
4350                 return ERR_PTR(-EINVAL);
4351
4352         list_for_each_entry_rcu(set, &table->sets, list) {
4353                 if (!nla_strcmp(nla, set->name) &&
4354                     nft_active_genmask(set, genmask))
4355                         return set;
4356         }
4357         return ERR_PTR(-ENOENT);
4358 }
4359
4360 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4361                                                const struct nlattr *nla,
4362                                                u8 genmask)
4363 {
4364         struct nft_set *set;
4365
4366         list_for_each_entry(set, &table->sets, list) {
4367                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4368                     nft_active_genmask(set, genmask))
4369                         return set;
4370         }
4371         return ERR_PTR(-ENOENT);
4372 }
4373
4374 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4375                                            const struct nft_table *table,
4376                                            const struct nlattr *nla, u8 genmask)
4377 {
4378         struct nftables_pernet *nft_net = nft_pernet(net);
4379         u32 id = ntohl(nla_get_be32(nla));
4380         struct nft_trans *trans;
4381
4382         list_for_each_entry(trans, &nft_net->commit_list, list) {
4383                 if (trans->msg_type == NFT_MSG_NEWSET) {
4384                         struct nft_set *set = nft_trans_set(trans);
4385
4386                         if (id == nft_trans_set_id(trans) &&
4387                             set->table == table &&
4388                             nft_active_genmask(set, genmask))
4389                                 return set;
4390                 }
4391         }
4392         return ERR_PTR(-ENOENT);
4393 }
4394
4395 struct nft_set *nft_set_lookup_global(const struct net *net,
4396                                       const struct nft_table *table,
4397                                       const struct nlattr *nla_set_name,
4398                                       const struct nlattr *nla_set_id,
4399                                       u8 genmask)
4400 {
4401         struct nft_set *set;
4402
4403         set = nft_set_lookup(table, nla_set_name, genmask);
4404         if (IS_ERR(set)) {
4405                 if (!nla_set_id)
4406                         return set;
4407
4408                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4409         }
4410         return set;
4411 }
4412 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4413
4414 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4415                                     const char *name)
4416 {
4417         const struct nft_set *i;
4418         const char *p;
4419         unsigned long *inuse;
4420         unsigned int n = 0, min = 0;
4421
4422         p = strchr(name, '%');
4423         if (p != NULL) {
4424                 if (p[1] != 'd' || strchr(p + 2, '%'))
4425                         return -EINVAL;
4426
4427                 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4428                         return -EINVAL;
4429
4430                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4431                 if (inuse == NULL)
4432                         return -ENOMEM;
4433 cont:
4434                 list_for_each_entry(i, &ctx->table->sets, list) {
4435                         int tmp;
4436
4437                         if (!nft_is_active_next(ctx->net, i))
4438                                 continue;
4439                         if (!sscanf(i->name, name, &tmp))
4440                                 continue;
4441                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4442                                 continue;
4443
4444                         set_bit(tmp - min, inuse);
4445                 }
4446
4447                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4448                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4449                         min += BITS_PER_BYTE * PAGE_SIZE;
4450                         memset(inuse, 0, PAGE_SIZE);
4451                         goto cont;
4452                 }
4453                 free_page((unsigned long)inuse);
4454         }
4455
4456         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4457         if (!set->name)
4458                 return -ENOMEM;
4459
4460         list_for_each_entry(i, &ctx->table->sets, list) {
4461                 if (!nft_is_active_next(ctx->net, i))
4462                         continue;
4463                 if (!strcmp(set->name, i->name)) {
4464                         kfree(set->name);
4465                         set->name = NULL;
4466                         return -ENFILE;
4467                 }
4468         }
4469         return 0;
4470 }
4471
4472 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4473 {
4474         u64 ms = be64_to_cpu(nla_get_be64(nla));
4475         u64 max = (u64)(~((u64)0));
4476
4477         max = div_u64(max, NSEC_PER_MSEC);
4478         if (ms >= max)
4479                 return -ERANGE;
4480
4481         ms *= NSEC_PER_MSEC;
4482         *result = nsecs_to_jiffies64(ms);
4483         return 0;
4484 }
4485
4486 __be64 nf_jiffies64_to_msecs(u64 input)
4487 {
4488         return cpu_to_be64(jiffies64_to_msecs(input));
4489 }
4490
4491 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4492                                      const struct nft_set *set)
4493 {
4494         struct nlattr *concat, *field;
4495         int i;
4496
4497         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4498         if (!concat)
4499                 return -ENOMEM;
4500
4501         for (i = 0; i < set->field_count; i++) {
4502                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4503                 if (!field)
4504                         return -ENOMEM;
4505
4506                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4507                                  htonl(set->field_len[i])))
4508                         return -ENOMEM;
4509
4510                 nla_nest_end(skb, field);
4511         }
4512
4513         nla_nest_end(skb, concat);
4514
4515         return 0;
4516 }
4517
4518 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4519                               const struct nft_set *set, u16 event, u16 flags)
4520 {
4521         u64 timeout = READ_ONCE(set->timeout);
4522         u32 gc_int = READ_ONCE(set->gc_int);
4523         u32 portid = ctx->portid;
4524         struct nlmsghdr *nlh;
4525         struct nlattr *nest;
4526         u32 seq = ctx->seq;
4527         int i;
4528
4529         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4530         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4531                            NFNETLINK_V0, nft_base_seq(ctx->net));
4532         if (!nlh)
4533                 goto nla_put_failure;
4534
4535         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4536                 goto nla_put_failure;
4537         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4538                 goto nla_put_failure;
4539         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4540                          NFTA_SET_PAD))
4541                 goto nla_put_failure;
4542
4543         if (event == NFT_MSG_DELSET) {
4544                 nlmsg_end(skb, nlh);
4545                 return 0;
4546         }
4547
4548         if (set->flags != 0)
4549                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4550                         goto nla_put_failure;
4551
4552         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4553                 goto nla_put_failure;
4554         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4555                 goto nla_put_failure;
4556         if (set->flags & NFT_SET_MAP) {
4557                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4558                         goto nla_put_failure;
4559                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4560                         goto nla_put_failure;
4561         }
4562         if (set->flags & NFT_SET_OBJECT &&
4563             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4564                 goto nla_put_failure;
4565
4566         if (timeout &&
4567             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4568                          nf_jiffies64_to_msecs(timeout),
4569                          NFTA_SET_PAD))
4570                 goto nla_put_failure;
4571         if (gc_int &&
4572             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4573                 goto nla_put_failure;
4574
4575         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4576                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4577                         goto nla_put_failure;
4578         }
4579
4580         if (set->udata &&
4581             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4582                 goto nla_put_failure;
4583
4584         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4585         if (!nest)
4586                 goto nla_put_failure;
4587         if (set->size &&
4588             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4589                 goto nla_put_failure;
4590
4591         if (set->field_count > 1 &&
4592             nf_tables_fill_set_concat(skb, set))
4593                 goto nla_put_failure;
4594
4595         nla_nest_end(skb, nest);
4596
4597         if (set->num_exprs == 1) {
4598                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4599                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4600                         goto nla_put_failure;
4601
4602                 nla_nest_end(skb, nest);
4603         } else if (set->num_exprs > 1) {
4604                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4605                 if (nest == NULL)
4606                         goto nla_put_failure;
4607
4608                 for (i = 0; i < set->num_exprs; i++) {
4609                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4610                                           set->exprs[i], false) < 0)
4611                                 goto nla_put_failure;
4612                 }
4613                 nla_nest_end(skb, nest);
4614         }
4615
4616         nlmsg_end(skb, nlh);
4617         return 0;
4618
4619 nla_put_failure:
4620         nlmsg_trim(skb, nlh);
4621         return -1;
4622 }
4623
4624 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4625                                  const struct nft_set *set, int event,
4626                                  gfp_t gfp_flags)
4627 {
4628         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4629         u32 portid = ctx->portid;
4630         struct sk_buff *skb;
4631         u16 flags = 0;
4632         int err;
4633
4634         if (!ctx->report &&
4635             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4636                 return;
4637
4638         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4639         if (skb == NULL)
4640                 goto err;
4641
4642         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4643                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4644
4645         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4646         if (err < 0) {
4647                 kfree_skb(skb);
4648                 goto err;
4649         }
4650
4651         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4652         return;
4653 err:
4654         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4655 }
4656
4657 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4658 {
4659         const struct nft_set *set;
4660         unsigned int idx, s_idx = cb->args[0];
4661         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4662         struct net *net = sock_net(skb->sk);
4663         struct nft_ctx *ctx = cb->data, ctx_set;
4664         struct nftables_pernet *nft_net;
4665
4666         if (cb->args[1])
4667                 return skb->len;
4668
4669         rcu_read_lock();
4670         nft_net = nft_pernet(net);
4671         cb->seq = READ_ONCE(nft_net->base_seq);
4672
4673         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4674                 if (ctx->family != NFPROTO_UNSPEC &&
4675                     ctx->family != table->family)
4676                         continue;
4677
4678                 if (ctx->table && ctx->table != table)
4679                         continue;
4680
4681                 if (cur_table) {
4682                         if (cur_table != table)
4683                                 continue;
4684
4685                         cur_table = NULL;
4686                 }
4687                 idx = 0;
4688                 list_for_each_entry_rcu(set, &table->sets, list) {
4689                         if (idx < s_idx)
4690                                 goto cont;
4691                         if (!nft_is_active(net, set))
4692                                 goto cont;
4693
4694                         ctx_set = *ctx;
4695                         ctx_set.table = table;
4696                         ctx_set.family = table->family;
4697
4698                         if (nf_tables_fill_set(skb, &ctx_set, set,
4699                                                NFT_MSG_NEWSET,
4700                                                NLM_F_MULTI) < 0) {
4701                                 cb->args[0] = idx;
4702                                 cb->args[2] = (unsigned long) table;
4703                                 goto done;
4704                         }
4705                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4706 cont:
4707                         idx++;
4708                 }
4709                 if (s_idx)
4710                         s_idx = 0;
4711         }
4712         cb->args[1] = 1;
4713 done:
4714         rcu_read_unlock();
4715         return skb->len;
4716 }
4717
4718 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4719 {
4720         struct nft_ctx *ctx_dump = NULL;
4721
4722         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4723         if (ctx_dump == NULL)
4724                 return -ENOMEM;
4725
4726         cb->data = ctx_dump;
4727         return 0;
4728 }
4729
4730 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4731 {
4732         kfree(cb->data);
4733         return 0;
4734 }
4735
4736 /* called with rcu_read_lock held */
4737 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4738                             const struct nlattr * const nla[])
4739 {
4740         struct netlink_ext_ack *extack = info->extack;
4741         u8 genmask = nft_genmask_cur(info->net);
4742         u8 family = info->nfmsg->nfgen_family;
4743         struct nft_table *table = NULL;
4744         struct net *net = info->net;
4745         const struct nft_set *set;
4746         struct sk_buff *skb2;
4747         struct nft_ctx ctx;
4748         int err;
4749
4750         if (nla[NFTA_SET_TABLE]) {
4751                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4752                                          genmask, 0);
4753                 if (IS_ERR(table)) {
4754                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4755                         return PTR_ERR(table);
4756                 }
4757         }
4758
4759         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4760
4761         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4762                 struct netlink_dump_control c = {
4763                         .start = nf_tables_dump_sets_start,
4764                         .dump = nf_tables_dump_sets,
4765                         .done = nf_tables_dump_sets_done,
4766                         .data = &ctx,
4767                         .module = THIS_MODULE,
4768                 };
4769
4770                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4771         }
4772
4773         /* Only accept unspec with dump */
4774         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4775                 return -EAFNOSUPPORT;
4776         if (!nla[NFTA_SET_TABLE])
4777                 return -EINVAL;
4778
4779         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4780         if (IS_ERR(set)) {
4781                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4782                 return PTR_ERR(set);
4783         }
4784
4785         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4786         if (skb2 == NULL)
4787                 return -ENOMEM;
4788
4789         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4790         if (err < 0)
4791                 goto err_fill_set_info;
4792
4793         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4794
4795 err_fill_set_info:
4796         kfree_skb(skb2);
4797         return err;
4798 }
4799
4800 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4801                                      struct nft_set_desc *desc)
4802 {
4803         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4804         u32 len;
4805         int err;
4806
4807         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4808                 return -E2BIG;
4809
4810         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4811                                           nft_concat_policy, NULL);
4812         if (err < 0)
4813                 return err;
4814
4815         if (!tb[NFTA_SET_FIELD_LEN])
4816                 return -EINVAL;
4817
4818         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4819         if (!len || len > U8_MAX)
4820                 return -EINVAL;
4821
4822         desc->field_len[desc->field_count++] = len;
4823
4824         return 0;
4825 }
4826
4827 static int nft_set_desc_concat(struct nft_set_desc *desc,
4828                                const struct nlattr *nla)
4829 {
4830         u32 num_regs = 0, key_num_regs = 0;
4831         struct nlattr *attr;
4832         int rem, err, i;
4833
4834         nla_for_each_nested(attr, nla, rem) {
4835                 if (nla_type(attr) != NFTA_LIST_ELEM)
4836                         return -EINVAL;
4837
4838                 err = nft_set_desc_concat_parse(attr, desc);
4839                 if (err < 0)
4840                         return err;
4841         }
4842
4843         for (i = 0; i < desc->field_count; i++)
4844                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4845
4846         key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4847         if (key_num_regs != num_regs)
4848                 return -EINVAL;
4849
4850         if (num_regs > NFT_REG32_COUNT)
4851                 return -E2BIG;
4852
4853         return 0;
4854 }
4855
4856 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4857                                     const struct nlattr *nla)
4858 {
4859         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4860         int err;
4861
4862         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4863                                           nft_set_desc_policy, NULL);
4864         if (err < 0)
4865                 return err;
4866
4867         if (da[NFTA_SET_DESC_SIZE] != NULL)
4868                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4869         if (da[NFTA_SET_DESC_CONCAT])
4870                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4871
4872         return err;
4873 }
4874
4875 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4876                               const struct nlattr * const *nla,
4877                               struct nft_expr **exprs, int *num_exprs,
4878                               u32 flags)
4879 {
4880         struct nft_expr *expr;
4881         int err, i;
4882
4883         if (nla[NFTA_SET_EXPR]) {
4884                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4885                 if (IS_ERR(expr)) {
4886                         err = PTR_ERR(expr);
4887                         goto err_set_expr_alloc;
4888                 }
4889                 exprs[0] = expr;
4890                 (*num_exprs)++;
4891         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4892                 struct nlattr *tmp;
4893                 int left;
4894
4895                 if (!(flags & NFT_SET_EXPR)) {
4896                         err = -EINVAL;
4897                         goto err_set_expr_alloc;
4898                 }
4899                 i = 0;
4900                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4901                         if (i == NFT_SET_EXPR_MAX) {
4902                                 err = -E2BIG;
4903                                 goto err_set_expr_alloc;
4904                         }
4905                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4906                                 err = -EINVAL;
4907                                 goto err_set_expr_alloc;
4908                         }
4909                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4910                         if (IS_ERR(expr)) {
4911                                 err = PTR_ERR(expr);
4912                                 goto err_set_expr_alloc;
4913                         }
4914                         exprs[i++] = expr;
4915                         (*num_exprs)++;
4916                 }
4917         }
4918
4919         return 0;
4920
4921 err_set_expr_alloc:
4922         for (i = 0; i < *num_exprs; i++)
4923                 nft_expr_destroy(ctx, exprs[i]);
4924
4925         return err;
4926 }
4927
4928 static bool nft_set_is_same(const struct nft_set *set,
4929                             const struct nft_set_desc *desc,
4930                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4931 {
4932         int i;
4933
4934         if (set->ktype != desc->ktype ||
4935             set->dtype != desc->dtype ||
4936             set->flags != flags ||
4937             set->klen != desc->klen ||
4938             set->dlen != desc->dlen ||
4939             set->field_count != desc->field_count ||
4940             set->num_exprs != num_exprs)
4941                 return false;
4942
4943         for (i = 0; i < desc->field_count; i++) {
4944                 if (set->field_len[i] != desc->field_len[i])
4945                         return false;
4946         }
4947
4948         for (i = 0; i < num_exprs; i++) {
4949                 if (set->exprs[i]->ops != exprs[i]->ops)
4950                         return false;
4951         }
4952
4953         return true;
4954 }
4955
4956 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4957                             const struct nlattr * const nla[])
4958 {
4959         struct netlink_ext_ack *extack = info->extack;
4960         u8 genmask = nft_genmask_next(info->net);
4961         u8 family = info->nfmsg->nfgen_family;
4962         const struct nft_set_ops *ops;
4963         struct net *net = info->net;
4964         struct nft_set_desc desc;
4965         struct nft_table *table;
4966         unsigned char *udata;
4967         struct nft_set *set;
4968         struct nft_ctx ctx;
4969         size_t alloc_size;
4970         int num_exprs = 0;
4971         char *name;
4972         int err, i;
4973         u16 udlen;
4974         u32 flags;
4975         u64 size;
4976
4977         if (nla[NFTA_SET_TABLE] == NULL ||
4978             nla[NFTA_SET_NAME] == NULL ||
4979             nla[NFTA_SET_KEY_LEN] == NULL ||
4980             nla[NFTA_SET_ID] == NULL)
4981                 return -EINVAL;
4982
4983         memset(&desc, 0, sizeof(desc));
4984
4985         desc.ktype = NFT_DATA_VALUE;
4986         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4987                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4988                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4989                         return -EINVAL;
4990         }
4991
4992         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4993         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4994                 return -EINVAL;
4995
4996         flags = 0;
4997         if (nla[NFTA_SET_FLAGS] != NULL) {
4998                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4999                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
5000                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
5001                               NFT_SET_MAP | NFT_SET_EVAL |
5002                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
5003                         return -EOPNOTSUPP;
5004                 /* Only one of these operations is supported */
5005                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
5006                              (NFT_SET_MAP | NFT_SET_OBJECT))
5007                         return -EOPNOTSUPP;
5008                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
5009                              (NFT_SET_EVAL | NFT_SET_OBJECT))
5010                         return -EOPNOTSUPP;
5011                 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
5012                              (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
5013                         return -EOPNOTSUPP;
5014                 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5015                              (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5016                         return -EOPNOTSUPP;
5017         }
5018
5019         desc.dtype = 0;
5020         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5021                 if (!(flags & NFT_SET_MAP))
5022                         return -EINVAL;
5023
5024                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5025                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5026                     desc.dtype != NFT_DATA_VERDICT)
5027                         return -EINVAL;
5028
5029                 if (desc.dtype != NFT_DATA_VERDICT) {
5030                         if (nla[NFTA_SET_DATA_LEN] == NULL)
5031                                 return -EINVAL;
5032                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5033                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5034                                 return -EINVAL;
5035                 } else
5036                         desc.dlen = sizeof(struct nft_verdict);
5037         } else if (flags & NFT_SET_MAP)
5038                 return -EINVAL;
5039
5040         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5041                 if (!(flags & NFT_SET_OBJECT))
5042                         return -EINVAL;
5043
5044                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5045                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5046                     desc.objtype > NFT_OBJECT_MAX)
5047                         return -EOPNOTSUPP;
5048         } else if (flags & NFT_SET_OBJECT)
5049                 return -EINVAL;
5050         else
5051                 desc.objtype = NFT_OBJECT_UNSPEC;
5052
5053         desc.timeout = 0;
5054         if (nla[NFTA_SET_TIMEOUT] != NULL) {
5055                 if (!(flags & NFT_SET_TIMEOUT))
5056                         return -EINVAL;
5057
5058                 if (flags & NFT_SET_ANONYMOUS)
5059                         return -EOPNOTSUPP;
5060
5061                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5062                 if (err)
5063                         return err;
5064         }
5065         desc.gc_int = 0;
5066         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5067                 if (!(flags & NFT_SET_TIMEOUT))
5068                         return -EINVAL;
5069
5070                 if (flags & NFT_SET_ANONYMOUS)
5071                         return -EOPNOTSUPP;
5072
5073                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5074         }
5075
5076         desc.policy = NFT_SET_POL_PERFORMANCE;
5077         if (nla[NFTA_SET_POLICY] != NULL) {
5078                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5079                 switch (desc.policy) {
5080                 case NFT_SET_POL_PERFORMANCE:
5081                 case NFT_SET_POL_MEMORY:
5082                         break;
5083                 default:
5084                         return -EOPNOTSUPP;
5085                 }
5086         }
5087
5088         if (nla[NFTA_SET_DESC] != NULL) {
5089                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5090                 if (err < 0)
5091                         return err;
5092
5093                 if (desc.field_count > 1) {
5094                         if (!(flags & NFT_SET_CONCAT))
5095                                 return -EINVAL;
5096                 } else if (flags & NFT_SET_CONCAT) {
5097                         return -EINVAL;
5098                 }
5099         } else if (flags & NFT_SET_CONCAT) {
5100                 return -EINVAL;
5101         }
5102
5103         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5104                 desc.expr = true;
5105
5106         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5107                                  NETLINK_CB(skb).portid);
5108         if (IS_ERR(table)) {
5109                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5110                 return PTR_ERR(table);
5111         }
5112
5113         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5114
5115         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5116         if (IS_ERR(set)) {
5117                 if (PTR_ERR(set) != -ENOENT) {
5118                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5119                         return PTR_ERR(set);
5120                 }
5121         } else {
5122                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5123
5124                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5125                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5126                         return -EEXIST;
5127                 }
5128                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5129                         return -EOPNOTSUPP;
5130
5131                 if (nft_set_is_anonymous(set))
5132                         return -EOPNOTSUPP;
5133
5134                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5135                 if (err < 0)
5136                         return err;
5137
5138                 err = 0;
5139                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5140                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5141                         err = -EEXIST;
5142                 }
5143
5144                 for (i = 0; i < num_exprs; i++)
5145                         nft_expr_destroy(&ctx, exprs[i]);
5146
5147                 if (err < 0)
5148                         return err;
5149
5150                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5151         }
5152
5153         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5154                 return -ENOENT;
5155
5156         ops = nft_select_set_ops(&ctx, flags, &desc);
5157         if (IS_ERR(ops))
5158                 return PTR_ERR(ops);
5159
5160         udlen = 0;
5161         if (nla[NFTA_SET_USERDATA])
5162                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5163
5164         size = 0;
5165         if (ops->privsize != NULL)
5166                 size = ops->privsize(nla, &desc);
5167         alloc_size = sizeof(*set) + size + udlen;
5168         if (alloc_size < size || alloc_size > INT_MAX)
5169                 return -ENOMEM;
5170
5171         if (!nft_use_inc(&table->use))
5172                 return -EMFILE;
5173
5174         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5175         if (!set) {
5176                 err = -ENOMEM;
5177                 goto err_alloc;
5178         }
5179
5180         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5181         if (!name) {
5182                 err = -ENOMEM;
5183                 goto err_set_name;
5184         }
5185
5186         err = nf_tables_set_alloc_name(&ctx, set, name);
5187         kfree(name);
5188         if (err < 0)
5189                 goto err_set_name;
5190
5191         udata = NULL;
5192         if (udlen) {
5193                 udata = set->data + size;
5194                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5195         }
5196
5197         INIT_LIST_HEAD(&set->bindings);
5198         INIT_LIST_HEAD(&set->catchall_list);
5199         refcount_set(&set->refs, 1);
5200         set->table = table;
5201         write_pnet(&set->net, net);
5202         set->ops = ops;
5203         set->ktype = desc.ktype;
5204         set->klen = desc.klen;
5205         set->dtype = desc.dtype;
5206         set->objtype = desc.objtype;
5207         set->dlen = desc.dlen;
5208         set->flags = flags;
5209         set->size = desc.size;
5210         set->policy = desc.policy;
5211         set->udlen = udlen;
5212         set->udata = udata;
5213         set->timeout = desc.timeout;
5214         set->gc_int = desc.gc_int;
5215
5216         set->field_count = desc.field_count;
5217         for (i = 0; i < desc.field_count; i++)
5218                 set->field_len[i] = desc.field_len[i];
5219
5220         err = ops->init(set, &desc, nla);
5221         if (err < 0)
5222                 goto err_set_init;
5223
5224         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5225         if (err < 0)
5226                 goto err_set_destroy;
5227
5228         set->num_exprs = num_exprs;
5229         set->handle = nf_tables_alloc_handle(table);
5230         INIT_LIST_HEAD(&set->pending_update);
5231
5232         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5233         if (err < 0)
5234                 goto err_set_expr_alloc;
5235
5236         list_add_tail_rcu(&set->list, &table->sets);
5237
5238         return 0;
5239
5240 err_set_expr_alloc:
5241         for (i = 0; i < set->num_exprs; i++)
5242                 nft_expr_destroy(&ctx, set->exprs[i]);
5243 err_set_destroy:
5244         ops->destroy(&ctx, set);
5245 err_set_init:
5246         kfree(set->name);
5247 err_set_name:
5248         kvfree(set);
5249 err_alloc:
5250         nft_use_dec_restore(&table->use);
5251
5252         return err;
5253 }
5254
5255 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5256                                      struct nft_set *set)
5257 {
5258         struct nft_set_elem_catchall *next, *catchall;
5259
5260         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5261                 list_del_rcu(&catchall->list);
5262                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5263                 kfree_rcu(catchall, rcu);
5264         }
5265 }
5266
5267 static void nft_set_put(struct nft_set *set)
5268 {
5269         if (refcount_dec_and_test(&set->refs)) {
5270                 kfree(set->name);
5271                 kvfree(set);
5272         }
5273 }
5274
5275 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5276 {
5277         int i;
5278
5279         if (WARN_ON(set->use > 0))
5280                 return;
5281
5282         for (i = 0; i < set->num_exprs; i++)
5283                 nft_expr_destroy(ctx, set->exprs[i]);
5284
5285         set->ops->destroy(ctx, set);
5286         nft_set_catchall_destroy(ctx, set);
5287         nft_set_put(set);
5288 }
5289
5290 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5291                             const struct nlattr * const nla[])
5292 {
5293         struct netlink_ext_ack *extack = info->extack;
5294         u8 genmask = nft_genmask_next(info->net);
5295         u8 family = info->nfmsg->nfgen_family;
5296         struct net *net = info->net;
5297         const struct nlattr *attr;
5298         struct nft_table *table;
5299         struct nft_set *set;
5300         struct nft_ctx ctx;
5301
5302         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5303                 return -EAFNOSUPPORT;
5304
5305         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5306                                  genmask, NETLINK_CB(skb).portid);
5307         if (IS_ERR(table)) {
5308                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5309                 return PTR_ERR(table);
5310         }
5311
5312         if (nla[NFTA_SET_HANDLE]) {
5313                 attr = nla[NFTA_SET_HANDLE];
5314                 set = nft_set_lookup_byhandle(table, attr, genmask);
5315         } else {
5316                 attr = nla[NFTA_SET_NAME];
5317                 set = nft_set_lookup(table, attr, genmask);
5318         }
5319
5320         if (IS_ERR(set)) {
5321                 if (PTR_ERR(set) == -ENOENT &&
5322                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5323                         return 0;
5324
5325                 NL_SET_BAD_ATTR(extack, attr);
5326                 return PTR_ERR(set);
5327         }
5328         if (set->use ||
5329             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5330              atomic_read(&set->nelems) > 0)) {
5331                 NL_SET_BAD_ATTR(extack, attr);
5332                 return -EBUSY;
5333         }
5334
5335         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5336
5337         return nft_delset(&ctx, set);
5338 }
5339
5340 static int nft_validate_register_store(const struct nft_ctx *ctx,
5341                                        enum nft_registers reg,
5342                                        const struct nft_data *data,
5343                                        enum nft_data_types type,
5344                                        unsigned int len);
5345
5346 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5347                                      struct nft_set *set,
5348                                      struct nft_elem_priv *elem_priv)
5349 {
5350         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5351         enum nft_registers dreg;
5352
5353         dreg = nft_type_to_reg(set->dtype);
5354         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5355                                            set->dtype == NFT_DATA_VERDICT ?
5356                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5357                                            set->dlen);
5358 }
5359
5360 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5361                                         struct nft_set *set,
5362                                         const struct nft_set_iter *iter,
5363                                         struct nft_elem_priv *elem_priv)
5364 {
5365         return nft_setelem_data_validate(ctx, set, elem_priv);
5366 }
5367
5368 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5369                                        struct nft_set *set)
5370 {
5371         u8 genmask = nft_genmask_next(ctx->net);
5372         struct nft_set_elem_catchall *catchall;
5373         struct nft_set_ext *ext;
5374         int ret = 0;
5375
5376         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5377                 ext = nft_set_elem_ext(set, catchall->elem);
5378                 if (!nft_set_elem_active(ext, genmask))
5379                         continue;
5380
5381                 ret = nft_setelem_data_validate(ctx, set, catchall->elem);
5382                 if (ret < 0)
5383                         break;
5384         }
5385
5386         return ret;
5387 }
5388
5389 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5390                        struct nft_set_binding *binding)
5391 {
5392         struct nft_set_binding *i;
5393         struct nft_set_iter iter;
5394
5395         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5396                 return -EBUSY;
5397
5398         if (binding->flags & NFT_SET_MAP) {
5399                 /* If the set is already bound to the same chain all
5400                  * jumps are already validated for that chain.
5401                  */
5402                 list_for_each_entry(i, &set->bindings, list) {
5403                         if (i->flags & NFT_SET_MAP &&
5404                             i->chain == binding->chain)
5405                                 goto bind;
5406                 }
5407
5408                 iter.genmask    = nft_genmask_next(ctx->net);
5409                 iter.skip       = 0;
5410                 iter.count      = 0;
5411                 iter.err        = 0;
5412                 iter.fn         = nf_tables_bind_check_setelem;
5413
5414                 set->ops->walk(ctx, set, &iter);
5415                 if (!iter.err)
5416                         iter.err = nft_set_catchall_bind_check(ctx, set);
5417
5418                 if (iter.err < 0)
5419                         return iter.err;
5420         }
5421 bind:
5422         if (!nft_use_inc(&set->use))
5423                 return -EMFILE;
5424
5425         binding->chain = ctx->chain;
5426         list_add_tail_rcu(&binding->list, &set->bindings);
5427         nft_set_trans_bind(ctx, set);
5428
5429         return 0;
5430 }
5431 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5432
5433 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5434                                  struct nft_set_binding *binding, bool event)
5435 {
5436         list_del_rcu(&binding->list);
5437
5438         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5439                 list_del_rcu(&set->list);
5440                 set->dead = 1;
5441                 if (event)
5442                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5443                                              GFP_KERNEL);
5444         }
5445 }
5446
5447 static void nft_setelem_data_activate(const struct net *net,
5448                                       const struct nft_set *set,
5449                                       struct nft_elem_priv *elem_priv);
5450
5451 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5452                                 struct nft_set *set,
5453                                 const struct nft_set_iter *iter,
5454                                 struct nft_elem_priv *elem_priv)
5455 {
5456         nft_setelem_data_activate(ctx->net, set, elem_priv);
5457
5458         return 0;
5459 }
5460
5461 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5462                                       struct nft_set *set)
5463 {
5464         u8 genmask = nft_genmask_next(ctx->net);
5465         struct nft_set_elem_catchall *catchall;
5466         struct nft_set_ext *ext;
5467
5468         list_for_each_entry(catchall, &set->catchall_list, list) {
5469                 ext = nft_set_elem_ext(set, catchall->elem);
5470                 if (!nft_set_elem_active(ext, genmask))
5471                         continue;
5472
5473                 nft_setelem_data_activate(ctx->net, set, catchall->elem);
5474                 break;
5475         }
5476 }
5477
5478 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5479 {
5480         struct nft_set_iter iter = {
5481                 .genmask        = nft_genmask_next(ctx->net),
5482                 .fn             = nft_mapelem_activate,
5483         };
5484
5485         set->ops->walk(ctx, set, &iter);
5486         WARN_ON_ONCE(iter.err);
5487
5488         nft_map_catchall_activate(ctx, set);
5489 }
5490
5491 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5492 {
5493         if (nft_set_is_anonymous(set)) {
5494                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5495                         nft_map_activate(ctx, set);
5496
5497                 nft_clear(ctx->net, set);
5498         }
5499
5500         nft_use_inc_restore(&set->use);
5501 }
5502 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5503
5504 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5505                               struct nft_set_binding *binding,
5506                               enum nft_trans_phase phase)
5507 {
5508         switch (phase) {
5509         case NFT_TRANS_PREPARE_ERROR:
5510                 nft_set_trans_unbind(ctx, set);
5511                 if (nft_set_is_anonymous(set))
5512                         nft_deactivate_next(ctx->net, set);
5513                 else
5514                         list_del_rcu(&binding->list);
5515
5516                 nft_use_dec(&set->use);
5517                 break;
5518         case NFT_TRANS_PREPARE:
5519                 if (nft_set_is_anonymous(set)) {
5520                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5521                                 nft_map_deactivate(ctx, set);
5522
5523                         nft_deactivate_next(ctx->net, set);
5524                 }
5525                 nft_use_dec(&set->use);
5526                 return;
5527         case NFT_TRANS_ABORT:
5528         case NFT_TRANS_RELEASE:
5529                 if (nft_set_is_anonymous(set) &&
5530                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5531                         nft_map_deactivate(ctx, set);
5532
5533                 nft_use_dec(&set->use);
5534                 fallthrough;
5535         default:
5536                 nf_tables_unbind_set(ctx, set, binding,
5537                                      phase == NFT_TRANS_COMMIT);
5538         }
5539 }
5540 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5541
5542 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5543 {
5544         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5545                 nft_set_destroy(ctx, set);
5546 }
5547 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5548
5549 const struct nft_set_ext_type nft_set_ext_types[] = {
5550         [NFT_SET_EXT_KEY]               = {
5551                 .align  = __alignof__(u32),
5552         },
5553         [NFT_SET_EXT_DATA]              = {
5554                 .align  = __alignof__(u32),
5555         },
5556         [NFT_SET_EXT_EXPRESSIONS]       = {
5557                 .align  = __alignof__(struct nft_set_elem_expr),
5558         },
5559         [NFT_SET_EXT_OBJREF]            = {
5560                 .len    = sizeof(struct nft_object *),
5561                 .align  = __alignof__(struct nft_object *),
5562         },
5563         [NFT_SET_EXT_FLAGS]             = {
5564                 .len    = sizeof(u8),
5565                 .align  = __alignof__(u8),
5566         },
5567         [NFT_SET_EXT_TIMEOUT]           = {
5568                 .len    = sizeof(u64),
5569                 .align  = __alignof__(u64),
5570         },
5571         [NFT_SET_EXT_EXPIRATION]        = {
5572                 .len    = sizeof(u64),
5573                 .align  = __alignof__(u64),
5574         },
5575         [NFT_SET_EXT_USERDATA]          = {
5576                 .len    = sizeof(struct nft_userdata),
5577                 .align  = __alignof__(struct nft_userdata),
5578         },
5579         [NFT_SET_EXT_KEY_END]           = {
5580                 .align  = __alignof__(u32),
5581         },
5582 };
5583
5584 /*
5585  * Set elements
5586  */
5587
5588 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5589         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5590         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5591         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5592         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5593         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5594         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5595                                             .len = NFT_USERDATA_MAXLEN },
5596         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5597         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5598                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5599         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5600         [NFTA_SET_ELEM_EXPRESSIONS]     = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5601 };
5602
5603 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5604         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5605                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5606         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5607                                             .len = NFT_SET_MAXNAMELEN - 1 },
5608         [NFTA_SET_ELEM_LIST_ELEMENTS]   = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5609         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5610 };
5611
5612 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5613                                   const struct nft_set *set,
5614                                   const struct nft_set_ext *ext,
5615                                   bool reset)
5616 {
5617         struct nft_set_elem_expr *elem_expr;
5618         u32 size, num_exprs = 0;
5619         struct nft_expr *expr;
5620         struct nlattr *nest;
5621
5622         elem_expr = nft_set_ext_expr(ext);
5623         nft_setelem_expr_foreach(expr, elem_expr, size)
5624                 num_exprs++;
5625
5626         if (num_exprs == 1) {
5627                 expr = nft_setelem_expr_at(elem_expr, 0);
5628                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5629                         return -1;
5630
5631                 return 0;
5632         } else if (num_exprs > 1) {
5633                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5634                 if (nest == NULL)
5635                         goto nla_put_failure;
5636
5637                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5638                         expr = nft_setelem_expr_at(elem_expr, size);
5639                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5640                                 goto nla_put_failure;
5641                 }
5642                 nla_nest_end(skb, nest);
5643         }
5644         return 0;
5645
5646 nla_put_failure:
5647         return -1;
5648 }
5649
5650 static int nf_tables_fill_setelem(struct sk_buff *skb,
5651                                   const struct nft_set *set,
5652                                   const struct nft_elem_priv *elem_priv,
5653                                   bool reset)
5654 {
5655         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5656         unsigned char *b = skb_tail_pointer(skb);
5657         struct nlattr *nest;
5658
5659         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5660         if (nest == NULL)
5661                 goto nla_put_failure;
5662
5663         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5664             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5665                           NFT_DATA_VALUE, set->klen) < 0)
5666                 goto nla_put_failure;
5667
5668         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5669             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5670                           NFT_DATA_VALUE, set->klen) < 0)
5671                 goto nla_put_failure;
5672
5673         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5674             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5675                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5676                           set->dlen) < 0)
5677                 goto nla_put_failure;
5678
5679         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5680             nft_set_elem_expr_dump(skb, set, ext, reset))
5681                 goto nla_put_failure;
5682
5683         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5684             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5685                            (*nft_set_ext_obj(ext))->key.name) < 0)
5686                 goto nla_put_failure;
5687
5688         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5689             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5690                          htonl(*nft_set_ext_flags(ext))))
5691                 goto nla_put_failure;
5692
5693         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5694             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5695                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5696                          NFTA_SET_ELEM_PAD))
5697                 goto nla_put_failure;
5698
5699         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5700                 u64 expires, now = get_jiffies_64();
5701
5702                 expires = *nft_set_ext_expiration(ext);
5703                 if (time_before64(now, expires))
5704                         expires -= now;
5705                 else
5706                         expires = 0;
5707
5708                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5709                                  nf_jiffies64_to_msecs(expires),
5710                                  NFTA_SET_ELEM_PAD))
5711                         goto nla_put_failure;
5712         }
5713
5714         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5715                 struct nft_userdata *udata;
5716
5717                 udata = nft_set_ext_userdata(ext);
5718                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5719                             udata->len + 1, udata->data))
5720                         goto nla_put_failure;
5721         }
5722
5723         nla_nest_end(skb, nest);
5724         return 0;
5725
5726 nla_put_failure:
5727         nlmsg_trim(skb, b);
5728         return -EMSGSIZE;
5729 }
5730
5731 struct nft_set_dump_args {
5732         const struct netlink_callback   *cb;
5733         struct nft_set_iter             iter;
5734         struct sk_buff                  *skb;
5735         bool                            reset;
5736 };
5737
5738 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5739                                   struct nft_set *set,
5740                                   const struct nft_set_iter *iter,
5741                                   struct nft_elem_priv *elem_priv)
5742 {
5743         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5744         struct nft_set_dump_args *args;
5745
5746         if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5747                 return 0;
5748
5749         args = container_of(iter, struct nft_set_dump_args, iter);
5750         return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
5751 }
5752
5753 static void audit_log_nft_set_reset(const struct nft_table *table,
5754                                     unsigned int base_seq,
5755                                     unsigned int nentries)
5756 {
5757         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5758
5759         audit_log_nfcfg(buf, table->family, nentries,
5760                         AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5761         kfree(buf);
5762 }
5763
5764 struct nft_set_dump_ctx {
5765         const struct nft_set    *set;
5766         struct nft_ctx          ctx;
5767         bool                    reset;
5768 };
5769
5770 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5771                                  const struct nft_set *set, bool reset,
5772                                  unsigned int base_seq)
5773 {
5774         struct nft_set_elem_catchall *catchall;
5775         u8 genmask = nft_genmask_cur(net);
5776         struct nft_set_ext *ext;
5777         int ret = 0;
5778
5779         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5780                 ext = nft_set_elem_ext(set, catchall->elem);
5781                 if (!nft_set_elem_active(ext, genmask) ||
5782                     nft_set_elem_expired(ext))
5783                         continue;
5784
5785                 ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
5786                 if (reset && !ret)
5787                         audit_log_nft_set_reset(set->table, base_seq, 1);
5788                 break;
5789         }
5790
5791         return ret;
5792 }
5793
5794 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5795 {
5796         struct nft_set_dump_ctx *dump_ctx = cb->data;
5797         struct net *net = sock_net(skb->sk);
5798         struct nftables_pernet *nft_net;
5799         struct nft_table *table;
5800         struct nft_set *set;
5801         struct nft_set_dump_args args;
5802         bool set_found = false;
5803         struct nlmsghdr *nlh;
5804         struct nlattr *nest;
5805         u32 portid, seq;
5806         int event;
5807
5808         rcu_read_lock();
5809         nft_net = nft_pernet(net);
5810         cb->seq = READ_ONCE(nft_net->base_seq);
5811
5812         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5813                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5814                     dump_ctx->ctx.family != table->family)
5815                         continue;
5816
5817                 if (table != dump_ctx->ctx.table)
5818                         continue;
5819
5820                 list_for_each_entry_rcu(set, &table->sets, list) {
5821                         if (set == dump_ctx->set) {
5822                                 set_found = true;
5823                                 break;
5824                         }
5825                 }
5826                 break;
5827         }
5828
5829         if (!set_found) {
5830                 rcu_read_unlock();
5831                 return -ENOENT;
5832         }
5833
5834         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5835         portid = NETLINK_CB(cb->skb).portid;
5836         seq    = cb->nlh->nlmsg_seq;
5837
5838         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5839                            table->family, NFNETLINK_V0, nft_base_seq(net));
5840         if (!nlh)
5841                 goto nla_put_failure;
5842
5843         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5844                 goto nla_put_failure;
5845         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5846                 goto nla_put_failure;
5847
5848         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5849         if (nest == NULL)
5850                 goto nla_put_failure;
5851
5852         args.cb                 = cb;
5853         args.skb                = skb;
5854         args.reset              = dump_ctx->reset;
5855         args.iter.genmask       = nft_genmask_cur(net);
5856         args.iter.skip          = cb->args[0];
5857         args.iter.count         = 0;
5858         args.iter.err           = 0;
5859         args.iter.fn            = nf_tables_dump_setelem;
5860         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5861
5862         if (!args.iter.err && args.iter.count == cb->args[0])
5863                 args.iter.err = nft_set_catchall_dump(net, skb, set,
5864                                                       dump_ctx->reset, cb->seq);
5865         nla_nest_end(skb, nest);
5866         nlmsg_end(skb, nlh);
5867
5868         rcu_read_unlock();
5869
5870         if (args.iter.err && args.iter.err != -EMSGSIZE)
5871                 return args.iter.err;
5872         if (args.iter.count == cb->args[0])
5873                 return 0;
5874
5875         cb->args[0] = args.iter.count;
5876         return skb->len;
5877
5878 nla_put_failure:
5879         rcu_read_unlock();
5880         return -ENOSPC;
5881 }
5882
5883 static int nf_tables_dumpreset_set(struct sk_buff *skb,
5884                                    struct netlink_callback *cb)
5885 {
5886         struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
5887         struct nft_set_dump_ctx *dump_ctx = cb->data;
5888         int ret, skip = cb->args[0];
5889
5890         mutex_lock(&nft_net->commit_mutex);
5891
5892         ret = nf_tables_dump_set(skb, cb);
5893
5894         if (cb->args[0] > skip)
5895                 audit_log_nft_set_reset(dump_ctx->ctx.table, cb->seq,
5896                                         cb->args[0] - skip);
5897
5898         mutex_unlock(&nft_net->commit_mutex);
5899
5900         return ret;
5901 }
5902
5903 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5904 {
5905         struct nft_set_dump_ctx *dump_ctx = cb->data;
5906
5907         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5908
5909         return cb->data ? 0 : -ENOMEM;
5910 }
5911
5912 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5913 {
5914         kfree(cb->data);
5915         return 0;
5916 }
5917
5918 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5919                                        const struct nft_ctx *ctx, u32 seq,
5920                                        u32 portid, int event, u16 flags,
5921                                        const struct nft_set *set,
5922                                        const struct nft_elem_priv *elem_priv,
5923                                        bool reset)
5924 {
5925         struct nlmsghdr *nlh;
5926         struct nlattr *nest;
5927         int err;
5928
5929         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5930         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5931                            NFNETLINK_V0, nft_base_seq(ctx->net));
5932         if (!nlh)
5933                 goto nla_put_failure;
5934
5935         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5936                 goto nla_put_failure;
5937         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5938                 goto nla_put_failure;
5939
5940         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5941         if (nest == NULL)
5942                 goto nla_put_failure;
5943
5944         err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
5945         if (err < 0)
5946                 goto nla_put_failure;
5947
5948         nla_nest_end(skb, nest);
5949
5950         nlmsg_end(skb, nlh);
5951         return 0;
5952
5953 nla_put_failure:
5954         nlmsg_trim(skb, nlh);
5955         return -1;
5956 }
5957
5958 static int nft_setelem_parse_flags(const struct nft_set *set,
5959                                    const struct nlattr *attr, u32 *flags)
5960 {
5961         if (attr == NULL)
5962                 return 0;
5963
5964         *flags = ntohl(nla_get_be32(attr));
5965         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5966                 return -EOPNOTSUPP;
5967         if (!(set->flags & NFT_SET_INTERVAL) &&
5968             *flags & NFT_SET_ELEM_INTERVAL_END)
5969                 return -EINVAL;
5970         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5971             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5972                 return -EINVAL;
5973
5974         return 0;
5975 }
5976
5977 static int nft_setelem_parse_key(struct nft_ctx *ctx, const struct nft_set *set,
5978                                  struct nft_data *key, struct nlattr *attr)
5979 {
5980         struct nft_data_desc desc = {
5981                 .type   = NFT_DATA_VALUE,
5982                 .size   = NFT_DATA_VALUE_MAXLEN,
5983                 .len    = set->klen,
5984         };
5985
5986         return nft_data_init(ctx, key, &desc, attr);
5987 }
5988
5989 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5990                                   struct nft_data_desc *desc,
5991                                   struct nft_data *data,
5992                                   struct nlattr *attr)
5993 {
5994         u32 dtype;
5995
5996         if (set->dtype == NFT_DATA_VERDICT)
5997                 dtype = NFT_DATA_VERDICT;
5998         else
5999                 dtype = NFT_DATA_VALUE;
6000
6001         desc->type = dtype;
6002         desc->size = NFT_DATA_VALUE_MAXLEN;
6003         desc->len = set->dlen;
6004         desc->flags = NFT_DATA_DESC_SETELEM;
6005
6006         return nft_data_init(ctx, data, desc, attr);
6007 }
6008
6009 static void *nft_setelem_catchall_get(const struct net *net,
6010                                       const struct nft_set *set)
6011 {
6012         struct nft_set_elem_catchall *catchall;
6013         u8 genmask = nft_genmask_cur(net);
6014         struct nft_set_ext *ext;
6015         void *priv = NULL;
6016
6017         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6018                 ext = nft_set_elem_ext(set, catchall->elem);
6019                 if (!nft_set_elem_active(ext, genmask) ||
6020                     nft_set_elem_expired(ext))
6021                         continue;
6022
6023                 priv = catchall->elem;
6024                 break;
6025         }
6026
6027         return priv;
6028 }
6029
6030 static int nft_setelem_get(struct nft_ctx *ctx, const struct nft_set *set,
6031                            struct nft_set_elem *elem, u32 flags)
6032 {
6033         void *priv;
6034
6035         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6036                 priv = set->ops->get(ctx->net, set, elem, flags);
6037                 if (IS_ERR(priv))
6038                         return PTR_ERR(priv);
6039         } else {
6040                 priv = nft_setelem_catchall_get(ctx->net, set);
6041                 if (!priv)
6042                         return -ENOENT;
6043         }
6044         elem->priv = priv;
6045
6046         return 0;
6047 }
6048
6049 static int nft_get_set_elem(struct nft_ctx *ctx, const struct nft_set *set,
6050                             const struct nlattr *attr, bool reset)
6051 {
6052         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6053         struct nft_set_elem elem;
6054         struct sk_buff *skb;
6055         uint32_t flags = 0;
6056         int err;
6057
6058         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6059                                           nft_set_elem_policy, NULL);
6060         if (err < 0)
6061                 return err;
6062
6063         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6064         if (err < 0)
6065                 return err;
6066
6067         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6068                 return -EINVAL;
6069
6070         if (nla[NFTA_SET_ELEM_KEY]) {
6071                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6072                                             nla[NFTA_SET_ELEM_KEY]);
6073                 if (err < 0)
6074                         return err;
6075         }
6076
6077         if (nla[NFTA_SET_ELEM_KEY_END]) {
6078                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6079                                             nla[NFTA_SET_ELEM_KEY_END]);
6080                 if (err < 0)
6081                         return err;
6082         }
6083
6084         err = nft_setelem_get(ctx, set, &elem, flags);
6085         if (err < 0)
6086                 return err;
6087
6088         err = -ENOMEM;
6089         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6090         if (skb == NULL)
6091                 return err;
6092
6093         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6094                                           NFT_MSG_NEWSETELEM, 0, set, elem.priv,
6095                                           reset);
6096         if (err < 0)
6097                 goto err_fill_setelem;
6098
6099         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6100
6101 err_fill_setelem:
6102         kfree_skb(skb);
6103         return err;
6104 }
6105
6106 static int nft_set_dump_ctx_init(struct nft_set_dump_ctx *dump_ctx,
6107                                  const struct sk_buff *skb,
6108                                  const struct nfnl_info *info,
6109                                  const struct nlattr * const nla[],
6110                                  bool reset)
6111 {
6112         struct netlink_ext_ack *extack = info->extack;
6113         u8 genmask = nft_genmask_cur(info->net);
6114         u8 family = info->nfmsg->nfgen_family;
6115         struct net *net = info->net;
6116         struct nft_table *table;
6117         struct nft_set *set;
6118
6119         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6120                                  genmask, 0);
6121         if (IS_ERR(table)) {
6122                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6123                 return PTR_ERR(table);
6124         }
6125
6126         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6127         if (IS_ERR(set)) {
6128                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6129                 return PTR_ERR(set);
6130         }
6131
6132         nft_ctx_init(&dump_ctx->ctx, net, skb,
6133                      info->nlh, family, table, NULL, nla);
6134         dump_ctx->set = set;
6135         dump_ctx->reset = reset;
6136         return 0;
6137 }
6138
6139 /* called with rcu_read_lock held */
6140 static int nf_tables_getsetelem(struct sk_buff *skb,
6141                                 const struct nfnl_info *info,
6142                                 const struct nlattr * const nla[])
6143 {
6144         struct netlink_ext_ack *extack = info->extack;
6145         struct nft_set_dump_ctx dump_ctx;
6146         struct nlattr *attr;
6147         int rem, err = 0;
6148
6149         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6150                 struct netlink_dump_control c = {
6151                         .start = nf_tables_dump_set_start,
6152                         .dump = nf_tables_dump_set,
6153                         .done = nf_tables_dump_set_done,
6154                         .module = THIS_MODULE,
6155                 };
6156
6157                 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6158                 if (err)
6159                         return err;
6160
6161                 c.data = &dump_ctx;
6162                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6163         }
6164
6165         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6166                 return -EINVAL;
6167
6168         err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6169         if (err)
6170                 return err;
6171
6172         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6173                 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, false);
6174                 if (err < 0) {
6175                         NL_SET_BAD_ATTR(extack, attr);
6176                         break;
6177                 }
6178         }
6179
6180         return err;
6181 }
6182
6183 static int nf_tables_getsetelem_reset(struct sk_buff *skb,
6184                                       const struct nfnl_info *info,
6185                                       const struct nlattr * const nla[])
6186 {
6187         struct nftables_pernet *nft_net = nft_pernet(info->net);
6188         struct netlink_ext_ack *extack = info->extack;
6189         struct nft_set_dump_ctx dump_ctx;
6190         int rem, err = 0, nelems = 0;
6191         struct nlattr *attr;
6192
6193         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6194                 struct netlink_dump_control c = {
6195                         .start = nf_tables_dump_set_start,
6196                         .dump = nf_tables_dumpreset_set,
6197                         .done = nf_tables_dump_set_done,
6198                         .module = THIS_MODULE,
6199                 };
6200
6201                 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6202                 if (err)
6203                         return err;
6204
6205                 c.data = &dump_ctx;
6206                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6207         }
6208
6209         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6210                 return -EINVAL;
6211
6212         if (!try_module_get(THIS_MODULE))
6213                 return -EINVAL;
6214         rcu_read_unlock();
6215         mutex_lock(&nft_net->commit_mutex);
6216         rcu_read_lock();
6217
6218         err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6219         if (err)
6220                 goto out_unlock;
6221
6222         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6223                 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, true);
6224                 if (err < 0) {
6225                         NL_SET_BAD_ATTR(extack, attr);
6226                         break;
6227                 }
6228                 nelems++;
6229         }
6230         audit_log_nft_set_reset(dump_ctx.ctx.table, nft_net->base_seq, nelems);
6231
6232 out_unlock:
6233         rcu_read_unlock();
6234         mutex_unlock(&nft_net->commit_mutex);
6235         rcu_read_lock();
6236         module_put(THIS_MODULE);
6237
6238         return err;
6239 }
6240
6241 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6242                                      const struct nft_set *set,
6243                                      const struct nft_elem_priv *elem_priv,
6244                                      int event)
6245 {
6246         struct nftables_pernet *nft_net;
6247         struct net *net = ctx->net;
6248         u32 portid = ctx->portid;
6249         struct sk_buff *skb;
6250         u16 flags = 0;
6251         int err;
6252
6253         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6254                 return;
6255
6256         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6257         if (skb == NULL)
6258                 goto err;
6259
6260         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6261                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6262
6263         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6264                                           set, elem_priv, false);
6265         if (err < 0) {
6266                 kfree_skb(skb);
6267                 goto err;
6268         }
6269
6270         nft_net = nft_pernet(net);
6271         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6272         return;
6273 err:
6274         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6275 }
6276
6277 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6278                                               int msg_type,
6279                                               struct nft_set *set)
6280 {
6281         struct nft_trans *trans;
6282
6283         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6284         if (trans == NULL)
6285                 return NULL;
6286
6287         nft_trans_elem_set(trans) = set;
6288         return trans;
6289 }
6290
6291 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6292                                          const struct nft_set *set,
6293                                          const struct nlattr *attr)
6294 {
6295         struct nft_expr *expr;
6296         int err;
6297
6298         expr = nft_expr_init(ctx, attr);
6299         if (IS_ERR(expr))
6300                 return expr;
6301
6302         err = -EOPNOTSUPP;
6303         if (expr->ops->type->flags & NFT_EXPR_GC) {
6304                 if (set->flags & NFT_SET_TIMEOUT)
6305                         goto err_set_elem_expr;
6306                 if (!set->ops->gc_init)
6307                         goto err_set_elem_expr;
6308                 set->ops->gc_init(set);
6309         }
6310
6311         return expr;
6312
6313 err_set_elem_expr:
6314         nft_expr_destroy(ctx, expr);
6315         return ERR_PTR(err);
6316 }
6317
6318 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6319 {
6320         len += nft_set_ext_types[id].len;
6321         if (len > tmpl->ext_len[id] ||
6322             len > U8_MAX)
6323                 return -1;
6324
6325         return 0;
6326 }
6327
6328 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6329                               void *to, const void *from, u32 len)
6330 {
6331         if (nft_set_ext_check(tmpl, id, len) < 0)
6332                 return -1;
6333
6334         memcpy(to, from, len);
6335
6336         return 0;
6337 }
6338
6339 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
6340                                         const struct nft_set_ext_tmpl *tmpl,
6341                                         const u32 *key, const u32 *key_end,
6342                                         const u32 *data,
6343                                         u64 timeout, u64 expiration, gfp_t gfp)
6344 {
6345         struct nft_set_ext *ext;
6346         void *elem;
6347
6348         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6349         if (elem == NULL)
6350                 return ERR_PTR(-ENOMEM);
6351
6352         ext = nft_set_elem_ext(set, elem);
6353         nft_set_ext_init(ext, tmpl);
6354
6355         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6356             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6357                                nft_set_ext_key(ext), key, set->klen) < 0)
6358                 goto err_ext_check;
6359
6360         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6361             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6362                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6363                 goto err_ext_check;
6364
6365         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6366             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6367                                nft_set_ext_data(ext), data, set->dlen) < 0)
6368                 goto err_ext_check;
6369
6370         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6371                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6372                 if (expiration == 0)
6373                         *nft_set_ext_expiration(ext) += timeout;
6374         }
6375         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6376                 *nft_set_ext_timeout(ext) = timeout;
6377
6378         return elem;
6379
6380 err_ext_check:
6381         kfree(elem);
6382
6383         return ERR_PTR(-EINVAL);
6384 }
6385
6386 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6387                                         struct nft_expr *expr)
6388 {
6389         if (expr->ops->destroy_clone) {
6390                 expr->ops->destroy_clone(ctx, expr);
6391                 module_put(expr->ops->type->owner);
6392         } else {
6393                 nf_tables_expr_destroy(ctx, expr);
6394         }
6395 }
6396
6397 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6398                                       struct nft_set_elem_expr *elem_expr)
6399 {
6400         struct nft_expr *expr;
6401         u32 size;
6402
6403         nft_setelem_expr_foreach(expr, elem_expr, size)
6404                 __nft_set_elem_expr_destroy(ctx, expr);
6405 }
6406
6407 /* Drop references and destroy. Called from gc, dynset and abort path. */
6408 void nft_set_elem_destroy(const struct nft_set *set,
6409                           const struct nft_elem_priv *elem_priv,
6410                           bool destroy_expr)
6411 {
6412         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6413         struct nft_ctx ctx = {
6414                 .net    = read_pnet(&set->net),
6415                 .family = set->table->family,
6416         };
6417
6418         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6419         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6420                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6421         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6422                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6423         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6424                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6425
6426         kfree(elem_priv);
6427 }
6428 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6429
6430 /* Destroy element. References have been already dropped in the preparation
6431  * path via nft_setelem_data_deactivate().
6432  */
6433 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6434                                 const struct nft_set *set,
6435                                 const struct nft_elem_priv *elem_priv)
6436 {
6437         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6438
6439         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6440                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6441
6442         kfree(elem_priv);
6443 }
6444
6445 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6446                             struct nft_expr *expr_array[])
6447 {
6448         struct nft_expr *expr;
6449         int err, i, k;
6450
6451         for (i = 0; i < set->num_exprs; i++) {
6452                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6453                 if (!expr)
6454                         goto err_expr;
6455
6456                 err = nft_expr_clone(expr, set->exprs[i]);
6457                 if (err < 0) {
6458                         kfree(expr);
6459                         goto err_expr;
6460                 }
6461                 expr_array[i] = expr;
6462         }
6463
6464         return 0;
6465
6466 err_expr:
6467         for (k = i - 1; k >= 0; k--)
6468                 nft_expr_destroy(ctx, expr_array[k]);
6469
6470         return -ENOMEM;
6471 }
6472
6473 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6474                                    const struct nft_set_ext_tmpl *tmpl,
6475                                    const struct nft_set_ext *ext,
6476                                    struct nft_expr *expr_array[],
6477                                    u32 num_exprs)
6478 {
6479         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6480         u32 len = sizeof(struct nft_set_elem_expr);
6481         struct nft_expr *expr;
6482         int i, err;
6483
6484         if (num_exprs == 0)
6485                 return 0;
6486
6487         for (i = 0; i < num_exprs; i++)
6488                 len += expr_array[i]->ops->size;
6489
6490         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6491                 return -EINVAL;
6492
6493         for (i = 0; i < num_exprs; i++) {
6494                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6495                 err = nft_expr_clone(expr, expr_array[i]);
6496                 if (err < 0)
6497                         goto err_elem_expr_setup;
6498
6499                 elem_expr->size += expr_array[i]->ops->size;
6500                 nft_expr_destroy(ctx, expr_array[i]);
6501                 expr_array[i] = NULL;
6502         }
6503
6504         return 0;
6505
6506 err_elem_expr_setup:
6507         for (; i < num_exprs; i++) {
6508                 nft_expr_destroy(ctx, expr_array[i]);
6509                 expr_array[i] = NULL;
6510         }
6511
6512         return -ENOMEM;
6513 }
6514
6515 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6516                                             const struct nft_set *set)
6517 {
6518         struct nft_set_elem_catchall *catchall;
6519         u8 genmask = nft_genmask_cur(net);
6520         struct nft_set_ext *ext;
6521
6522         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6523                 ext = nft_set_elem_ext(set, catchall->elem);
6524                 if (nft_set_elem_active(ext, genmask) &&
6525                     !nft_set_elem_expired(ext) &&
6526                     !nft_set_elem_is_dead(ext))
6527                         return ext;
6528         }
6529
6530         return NULL;
6531 }
6532 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6533
6534 static int nft_setelem_catchall_insert(const struct net *net,
6535                                        struct nft_set *set,
6536                                        const struct nft_set_elem *elem,
6537                                        struct nft_elem_priv **priv)
6538 {
6539         struct nft_set_elem_catchall *catchall;
6540         u8 genmask = nft_genmask_next(net);
6541         struct nft_set_ext *ext;
6542
6543         list_for_each_entry(catchall, &set->catchall_list, list) {
6544                 ext = nft_set_elem_ext(set, catchall->elem);
6545                 if (nft_set_elem_active(ext, genmask)) {
6546                         *priv = catchall->elem;
6547                         return -EEXIST;
6548                 }
6549         }
6550
6551         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6552         if (!catchall)
6553                 return -ENOMEM;
6554
6555         catchall->elem = elem->priv;
6556         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6557
6558         return 0;
6559 }
6560
6561 static int nft_setelem_insert(const struct net *net,
6562                               struct nft_set *set,
6563                               const struct nft_set_elem *elem,
6564                               struct nft_elem_priv **elem_priv,
6565                               unsigned int flags)
6566 {
6567         int ret;
6568
6569         if (flags & NFT_SET_ELEM_CATCHALL)
6570                 ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
6571         else
6572                 ret = set->ops->insert(net, set, elem, elem_priv);
6573
6574         return ret;
6575 }
6576
6577 static bool nft_setelem_is_catchall(const struct nft_set *set,
6578                                     const struct nft_elem_priv *elem_priv)
6579 {
6580         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6581
6582         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6583             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6584                 return true;
6585
6586         return false;
6587 }
6588
6589 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6590                                  struct nft_elem_priv *elem_priv)
6591 {
6592         struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6593
6594         if (nft_setelem_is_catchall(set, elem_priv)) {
6595                 nft_set_elem_change_active(net, set, ext);
6596         } else {
6597                 set->ops->activate(net, set, elem_priv);
6598         }
6599 }
6600
6601 static int nft_setelem_catchall_deactivate(const struct net *net,
6602                                            struct nft_set *set,
6603                                            struct nft_set_elem *elem)
6604 {
6605         struct nft_set_elem_catchall *catchall;
6606         struct nft_set_ext *ext;
6607
6608         list_for_each_entry(catchall, &set->catchall_list, list) {
6609                 ext = nft_set_elem_ext(set, catchall->elem);
6610                 if (!nft_is_active_next(net, ext))
6611                         continue;
6612
6613                 kfree(elem->priv);
6614                 elem->priv = catchall->elem;
6615                 nft_set_elem_change_active(net, set, ext);
6616                 return 0;
6617         }
6618
6619         return -ENOENT;
6620 }
6621
6622 static int __nft_setelem_deactivate(const struct net *net,
6623                                     struct nft_set *set,
6624                                     struct nft_set_elem *elem)
6625 {
6626         void *priv;
6627
6628         priv = set->ops->deactivate(net, set, elem);
6629         if (!priv)
6630                 return -ENOENT;
6631
6632         kfree(elem->priv);
6633         elem->priv = priv;
6634         set->ndeact++;
6635
6636         return 0;
6637 }
6638
6639 static int nft_setelem_deactivate(const struct net *net,
6640                                   struct nft_set *set,
6641                                   struct nft_set_elem *elem, u32 flags)
6642 {
6643         int ret;
6644
6645         if (flags & NFT_SET_ELEM_CATCHALL)
6646                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6647         else
6648                 ret = __nft_setelem_deactivate(net, set, elem);
6649
6650         return ret;
6651 }
6652
6653 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6654 {
6655         list_del_rcu(&catchall->list);
6656         kfree_rcu(catchall, rcu);
6657 }
6658
6659 static void nft_setelem_catchall_remove(const struct net *net,
6660                                         const struct nft_set *set,
6661                                         struct nft_elem_priv *elem_priv)
6662 {
6663         struct nft_set_elem_catchall *catchall, *next;
6664
6665         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6666                 if (catchall->elem == elem_priv) {
6667                         nft_setelem_catchall_destroy(catchall);
6668                         break;
6669                 }
6670         }
6671 }
6672
6673 static void nft_setelem_remove(const struct net *net,
6674                                const struct nft_set *set,
6675                                struct nft_elem_priv *elem_priv)
6676 {
6677         if (nft_setelem_is_catchall(set, elem_priv))
6678                 nft_setelem_catchall_remove(net, set, elem_priv);
6679         else
6680                 set->ops->remove(net, set, elem_priv);
6681 }
6682
6683 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6684                                       struct nlattr **nla, u32 flags)
6685 {
6686         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6687                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6688                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6689                         return false;
6690
6691                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6692                     flags & NFT_SET_ELEM_CATCHALL)
6693                         return false;
6694         } else {
6695                 if (nla[NFTA_SET_ELEM_KEY_END])
6696                         return false;
6697         }
6698
6699         return true;
6700 }
6701
6702 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6703                             const struct nlattr *attr, u32 nlmsg_flags)
6704 {
6705         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6706         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6707         u8 genmask = nft_genmask_next(ctx->net);
6708         u32 flags = 0, size = 0, num_exprs = 0;
6709         struct nft_set_ext_tmpl tmpl;
6710         struct nft_set_ext *ext, *ext2;
6711         struct nft_set_elem elem;
6712         struct nft_set_binding *binding;
6713         struct nft_elem_priv *elem_priv;
6714         struct nft_object *obj = NULL;
6715         struct nft_userdata *udata;
6716         struct nft_data_desc desc;
6717         enum nft_registers dreg;
6718         struct nft_trans *trans;
6719         u64 expiration;
6720         u64 timeout;
6721         int err, i;
6722         u8 ulen;
6723
6724         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6725                                           nft_set_elem_policy, NULL);
6726         if (err < 0)
6727                 return err;
6728
6729         nft_set_ext_prepare(&tmpl);
6730
6731         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6732         if (err < 0)
6733                 return err;
6734
6735         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6736             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6737                 return -EINVAL;
6738
6739         if (flags != 0) {
6740                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6741                 if (err < 0)
6742                         return err;
6743         }
6744
6745         if (set->flags & NFT_SET_MAP) {
6746                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6747                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6748                         return -EINVAL;
6749         } else {
6750                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6751                         return -EINVAL;
6752         }
6753
6754         if (set->flags & NFT_SET_OBJECT) {
6755                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6756                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6757                         return -EINVAL;
6758         } else {
6759                 if (nla[NFTA_SET_ELEM_OBJREF])
6760                         return -EINVAL;
6761         }
6762
6763         if (!nft_setelem_valid_key_end(set, nla, flags))
6764                 return -EINVAL;
6765
6766         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6767              (nla[NFTA_SET_ELEM_DATA] ||
6768               nla[NFTA_SET_ELEM_OBJREF] ||
6769               nla[NFTA_SET_ELEM_TIMEOUT] ||
6770               nla[NFTA_SET_ELEM_EXPIRATION] ||
6771               nla[NFTA_SET_ELEM_USERDATA] ||
6772               nla[NFTA_SET_ELEM_EXPR] ||
6773               nla[NFTA_SET_ELEM_KEY_END] ||
6774               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6775                 return -EINVAL;
6776
6777         timeout = 0;
6778         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6779                 if (!(set->flags & NFT_SET_TIMEOUT))
6780                         return -EINVAL;
6781                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6782                                             &timeout);
6783                 if (err)
6784                         return err;
6785         } else if (set->flags & NFT_SET_TIMEOUT &&
6786                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6787                 timeout = READ_ONCE(set->timeout);
6788         }
6789
6790         expiration = 0;
6791         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6792                 if (!(set->flags & NFT_SET_TIMEOUT))
6793                         return -EINVAL;
6794                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6795                                             &expiration);
6796                 if (err)
6797                         return err;
6798         }
6799
6800         if (nla[NFTA_SET_ELEM_EXPR]) {
6801                 struct nft_expr *expr;
6802
6803                 if (set->num_exprs && set->num_exprs != 1)
6804                         return -EOPNOTSUPP;
6805
6806                 expr = nft_set_elem_expr_alloc(ctx, set,
6807                                                nla[NFTA_SET_ELEM_EXPR]);
6808                 if (IS_ERR(expr))
6809                         return PTR_ERR(expr);
6810
6811                 expr_array[0] = expr;
6812                 num_exprs = 1;
6813
6814                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6815                         err = -EOPNOTSUPP;
6816                         goto err_set_elem_expr;
6817                 }
6818         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6819                 struct nft_expr *expr;
6820                 struct nlattr *tmp;
6821                 int left;
6822
6823                 i = 0;
6824                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6825                         if (i == NFT_SET_EXPR_MAX ||
6826                             (set->num_exprs && set->num_exprs == i)) {
6827                                 err = -E2BIG;
6828                                 goto err_set_elem_expr;
6829                         }
6830                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6831                                 err = -EINVAL;
6832                                 goto err_set_elem_expr;
6833                         }
6834                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6835                         if (IS_ERR(expr)) {
6836                                 err = PTR_ERR(expr);
6837                                 goto err_set_elem_expr;
6838                         }
6839                         expr_array[i] = expr;
6840                         num_exprs++;
6841
6842                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6843                                 err = -EOPNOTSUPP;
6844                                 goto err_set_elem_expr;
6845                         }
6846                         i++;
6847                 }
6848                 if (set->num_exprs && set->num_exprs != i) {
6849                         err = -EOPNOTSUPP;
6850                         goto err_set_elem_expr;
6851                 }
6852         } else if (set->num_exprs > 0 &&
6853                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6854                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6855                 if (err < 0)
6856                         goto err_set_elem_expr_clone;
6857
6858                 num_exprs = set->num_exprs;
6859         }
6860
6861         if (nla[NFTA_SET_ELEM_KEY]) {
6862                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6863                                             nla[NFTA_SET_ELEM_KEY]);
6864                 if (err < 0)
6865                         goto err_set_elem_expr;
6866
6867                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6868                 if (err < 0)
6869                         goto err_parse_key;
6870         }
6871
6872         if (nla[NFTA_SET_ELEM_KEY_END]) {
6873                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6874                                             nla[NFTA_SET_ELEM_KEY_END]);
6875                 if (err < 0)
6876                         goto err_parse_key;
6877
6878                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6879                 if (err < 0)
6880                         goto err_parse_key_end;
6881         }
6882
6883         if (timeout > 0) {
6884                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6885                 if (err < 0)
6886                         goto err_parse_key_end;
6887
6888                 if (timeout != READ_ONCE(set->timeout)) {
6889                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6890                         if (err < 0)
6891                                 goto err_parse_key_end;
6892                 }
6893         }
6894
6895         if (num_exprs) {
6896                 for (i = 0; i < num_exprs; i++)
6897                         size += expr_array[i]->ops->size;
6898
6899                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6900                                              sizeof(struct nft_set_elem_expr) + size);
6901                 if (err < 0)
6902                         goto err_parse_key_end;
6903         }
6904
6905         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6906                 obj = nft_obj_lookup(ctx->net, ctx->table,
6907                                      nla[NFTA_SET_ELEM_OBJREF],
6908                                      set->objtype, genmask);
6909                 if (IS_ERR(obj)) {
6910                         err = PTR_ERR(obj);
6911                         obj = NULL;
6912                         goto err_parse_key_end;
6913                 }
6914
6915                 if (!nft_use_inc(&obj->use)) {
6916                         err = -EMFILE;
6917                         obj = NULL;
6918                         goto err_parse_key_end;
6919                 }
6920
6921                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6922                 if (err < 0)
6923                         goto err_parse_key_end;
6924         }
6925
6926         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6927                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6928                                              nla[NFTA_SET_ELEM_DATA]);
6929                 if (err < 0)
6930                         goto err_parse_key_end;
6931
6932                 dreg = nft_type_to_reg(set->dtype);
6933                 list_for_each_entry(binding, &set->bindings, list) {
6934                         struct nft_ctx bind_ctx = {
6935                                 .net    = ctx->net,
6936                                 .family = ctx->family,
6937                                 .table  = ctx->table,
6938                                 .chain  = (struct nft_chain *)binding->chain,
6939                         };
6940
6941                         if (!(binding->flags & NFT_SET_MAP))
6942                                 continue;
6943
6944                         err = nft_validate_register_store(&bind_ctx, dreg,
6945                                                           &elem.data.val,
6946                                                           desc.type, desc.len);
6947                         if (err < 0)
6948                                 goto err_parse_data;
6949
6950                         if (desc.type == NFT_DATA_VERDICT &&
6951                             (elem.data.val.verdict.code == NFT_GOTO ||
6952                              elem.data.val.verdict.code == NFT_JUMP))
6953                                 nft_validate_state_update(ctx->table,
6954                                                           NFT_VALIDATE_NEED);
6955                 }
6956
6957                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6958                 if (err < 0)
6959                         goto err_parse_data;
6960         }
6961
6962         /* The full maximum length of userdata can exceed the maximum
6963          * offset value (U8_MAX) for following extensions, therefor it
6964          * must be the last extension added.
6965          */
6966         ulen = 0;
6967         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6968                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6969                 if (ulen > 0) {
6970                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6971                                                      ulen);
6972                         if (err < 0)
6973                                 goto err_parse_data;
6974                 }
6975         }
6976
6977         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6978                                       elem.key_end.val.data, elem.data.val.data,
6979                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6980         if (IS_ERR(elem.priv)) {
6981                 err = PTR_ERR(elem.priv);
6982                 goto err_parse_data;
6983         }
6984
6985         ext = nft_set_elem_ext(set, elem.priv);
6986         if (flags)
6987                 *nft_set_ext_flags(ext) = flags;
6988
6989         if (obj)
6990                 *nft_set_ext_obj(ext) = obj;
6991
6992         if (ulen > 0) {
6993                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6994                         err = -EINVAL;
6995                         goto err_elem_free;
6996                 }
6997                 udata = nft_set_ext_userdata(ext);
6998                 udata->len = ulen - 1;
6999                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
7000         }
7001         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
7002         if (err < 0)
7003                 goto err_elem_free;
7004
7005         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
7006         if (trans == NULL) {
7007                 err = -ENOMEM;
7008                 goto err_elem_free;
7009         }
7010
7011         ext->genmask = nft_genmask_cur(ctx->net);
7012
7013         err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
7014         if (err) {
7015                 if (err == -EEXIST) {
7016                         ext2 = nft_set_elem_ext(set, elem_priv);
7017                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
7018                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
7019                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
7020                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7021                                 goto err_element_clash;
7022                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
7023                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
7024                              memcmp(nft_set_ext_data(ext),
7025                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
7026                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
7027                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
7028                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
7029                                 goto err_element_clash;
7030                         else if (!(nlmsg_flags & NLM_F_EXCL))
7031                                 err = 0;
7032                 } else if (err == -ENOTEMPTY) {
7033                         /* ENOTEMPTY reports overlapping between this element
7034                          * and an existing one.
7035                          */
7036                         err = -EEXIST;
7037                 }
7038                 goto err_element_clash;
7039         }
7040
7041         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
7042                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
7043
7044                 if (!atomic_add_unless(&set->nelems, 1, max)) {
7045                         err = -ENFILE;
7046                         goto err_set_full;
7047                 }
7048         }
7049
7050         nft_trans_elem_priv(trans) = elem.priv;
7051         nft_trans_commit_list_add_tail(ctx->net, trans);
7052         return 0;
7053
7054 err_set_full:
7055         nft_setelem_remove(ctx->net, set, elem.priv);
7056 err_element_clash:
7057         kfree(trans);
7058 err_elem_free:
7059         nf_tables_set_elem_destroy(ctx, set, elem.priv);
7060 err_parse_data:
7061         if (nla[NFTA_SET_ELEM_DATA] != NULL)
7062                 nft_data_release(&elem.data.val, desc.type);
7063 err_parse_key_end:
7064         if (obj)
7065                 nft_use_dec_restore(&obj->use);
7066
7067         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7068 err_parse_key:
7069         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7070 err_set_elem_expr:
7071         for (i = 0; i < num_exprs && expr_array[i]; i++)
7072                 nft_expr_destroy(ctx, expr_array[i]);
7073 err_set_elem_expr_clone:
7074         return err;
7075 }
7076
7077 static int nf_tables_newsetelem(struct sk_buff *skb,
7078                                 const struct nfnl_info *info,
7079                                 const struct nlattr * const nla[])
7080 {
7081         struct netlink_ext_ack *extack = info->extack;
7082         u8 genmask = nft_genmask_next(info->net);
7083         u8 family = info->nfmsg->nfgen_family;
7084         struct net *net = info->net;
7085         const struct nlattr *attr;
7086         struct nft_table *table;
7087         struct nft_set *set;
7088         struct nft_ctx ctx;
7089         int rem, err;
7090
7091         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
7092                 return -EINVAL;
7093
7094         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7095                                  genmask, NETLINK_CB(skb).portid);
7096         if (IS_ERR(table)) {
7097                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7098                 return PTR_ERR(table);
7099         }
7100
7101         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7102                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7103         if (IS_ERR(set)) {
7104                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7105                 return PTR_ERR(set);
7106         }
7107
7108         if (!list_empty(&set->bindings) &&
7109             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7110                 return -EBUSY;
7111
7112         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7113
7114         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7115                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7116                 if (err < 0) {
7117                         NL_SET_BAD_ATTR(extack, attr);
7118                         return err;
7119                 }
7120         }
7121
7122         if (table->validate_state == NFT_VALIDATE_DO)
7123                 return nft_table_validate(net, table);
7124
7125         return 0;
7126 }
7127
7128 /**
7129  *      nft_data_hold - hold a nft_data item
7130  *
7131  *      @data: struct nft_data to release
7132  *      @type: type of data
7133  *
7134  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7135  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7136  *      NFT_GOTO verdicts. This function must be called on active data objects
7137  *      from the second phase of the commit protocol.
7138  */
7139 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7140 {
7141         struct nft_chain *chain;
7142
7143         if (type == NFT_DATA_VERDICT) {
7144                 switch (data->verdict.code) {
7145                 case NFT_JUMP:
7146                 case NFT_GOTO:
7147                         chain = data->verdict.chain;
7148                         nft_use_inc_restore(&chain->use);
7149                         break;
7150                 }
7151         }
7152 }
7153
7154 static void nft_setelem_data_activate(const struct net *net,
7155                                       const struct nft_set *set,
7156                                       struct nft_elem_priv *elem_priv)
7157 {
7158         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7159
7160         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7161                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7162         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7163                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7164 }
7165
7166 void nft_setelem_data_deactivate(const struct net *net,
7167                                  const struct nft_set *set,
7168                                  struct nft_elem_priv *elem_priv)
7169 {
7170         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7171
7172         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7173                 nft_data_release(nft_set_ext_data(ext), set->dtype);
7174         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7175                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7176 }
7177
7178 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7179                            const struct nlattr *attr)
7180 {
7181         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7182         struct nft_set_ext_tmpl tmpl;
7183         struct nft_set_elem elem;
7184         struct nft_set_ext *ext;
7185         struct nft_trans *trans;
7186         u32 flags = 0;
7187         int err;
7188
7189         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7190                                           nft_set_elem_policy, NULL);
7191         if (err < 0)
7192                 return err;
7193
7194         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7195         if (err < 0)
7196                 return err;
7197
7198         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7199                 return -EINVAL;
7200
7201         if (!nft_setelem_valid_key_end(set, nla, flags))
7202                 return -EINVAL;
7203
7204         nft_set_ext_prepare(&tmpl);
7205
7206         if (flags != 0) {
7207                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7208                 if (err < 0)
7209                         return err;
7210         }
7211
7212         if (nla[NFTA_SET_ELEM_KEY]) {
7213                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7214                                             nla[NFTA_SET_ELEM_KEY]);
7215                 if (err < 0)
7216                         return err;
7217
7218                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7219                 if (err < 0)
7220                         goto fail_elem;
7221         }
7222
7223         if (nla[NFTA_SET_ELEM_KEY_END]) {
7224                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7225                                             nla[NFTA_SET_ELEM_KEY_END]);
7226                 if (err < 0)
7227                         goto fail_elem;
7228
7229                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7230                 if (err < 0)
7231                         goto fail_elem_key_end;
7232         }
7233
7234         err = -ENOMEM;
7235         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7236                                       elem.key_end.val.data, NULL, 0, 0,
7237                                       GFP_KERNEL_ACCOUNT);
7238         if (IS_ERR(elem.priv)) {
7239                 err = PTR_ERR(elem.priv);
7240                 goto fail_elem_key_end;
7241         }
7242
7243         ext = nft_set_elem_ext(set, elem.priv);
7244         if (flags)
7245                 *nft_set_ext_flags(ext) = flags;
7246
7247         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7248         if (trans == NULL)
7249                 goto fail_trans;
7250
7251         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7252         if (err < 0)
7253                 goto fail_ops;
7254
7255         nft_setelem_data_deactivate(ctx->net, set, elem.priv);
7256
7257         nft_trans_elem_priv(trans) = elem.priv;
7258         nft_trans_commit_list_add_tail(ctx->net, trans);
7259         return 0;
7260
7261 fail_ops:
7262         kfree(trans);
7263 fail_trans:
7264         kfree(elem.priv);
7265 fail_elem_key_end:
7266         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7267 fail_elem:
7268         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7269         return err;
7270 }
7271
7272 static int nft_setelem_flush(const struct nft_ctx *ctx,
7273                              struct nft_set *set,
7274                              const struct nft_set_iter *iter,
7275                              struct nft_elem_priv *elem_priv)
7276 {
7277         struct nft_trans *trans;
7278
7279         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7280                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7281         if (!trans)
7282                 return -ENOMEM;
7283
7284         set->ops->flush(ctx->net, set, elem_priv);
7285         set->ndeact++;
7286
7287         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7288         nft_trans_elem_set(trans) = set;
7289         nft_trans_elem_priv(trans) = elem_priv;
7290         nft_trans_commit_list_add_tail(ctx->net, trans);
7291
7292         return 0;
7293 }
7294
7295 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7296                                     struct nft_set *set,
7297                                     struct nft_elem_priv *elem_priv)
7298 {
7299         struct nft_trans *trans;
7300
7301         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7302                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7303         if (!trans)
7304                 return -ENOMEM;
7305
7306         nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7307         nft_trans_elem_set(trans) = set;
7308         nft_trans_elem_priv(trans) = elem_priv;
7309         nft_trans_commit_list_add_tail(ctx->net, trans);
7310
7311         return 0;
7312 }
7313
7314 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7315                                   struct nft_set *set)
7316 {
7317         u8 genmask = nft_genmask_next(ctx->net);
7318         struct nft_set_elem_catchall *catchall;
7319         struct nft_set_ext *ext;
7320         int ret = 0;
7321
7322         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7323                 ext = nft_set_elem_ext(set, catchall->elem);
7324                 if (!nft_set_elem_active(ext, genmask))
7325                         continue;
7326
7327                 ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
7328                 if (ret < 0)
7329                         break;
7330                 nft_set_elem_change_active(ctx->net, set, ext);
7331         }
7332
7333         return ret;
7334 }
7335
7336 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7337 {
7338         struct nft_set_iter iter = {
7339                 .genmask        = genmask,
7340                 .fn             = nft_setelem_flush,
7341         };
7342
7343         set->ops->walk(ctx, set, &iter);
7344         if (!iter.err)
7345                 iter.err = nft_set_catchall_flush(ctx, set);
7346
7347         return iter.err;
7348 }
7349
7350 static int nf_tables_delsetelem(struct sk_buff *skb,
7351                                 const struct nfnl_info *info,
7352                                 const struct nlattr * const nla[])
7353 {
7354         struct netlink_ext_ack *extack = info->extack;
7355         u8 genmask = nft_genmask_next(info->net);
7356         u8 family = info->nfmsg->nfgen_family;
7357         struct net *net = info->net;
7358         const struct nlattr *attr;
7359         struct nft_table *table;
7360         struct nft_set *set;
7361         struct nft_ctx ctx;
7362         int rem, err = 0;
7363
7364         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7365                                  genmask, NETLINK_CB(skb).portid);
7366         if (IS_ERR(table)) {
7367                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7368                 return PTR_ERR(table);
7369         }
7370
7371         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7372         if (IS_ERR(set)) {
7373                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7374                 return PTR_ERR(set);
7375         }
7376
7377         if (nft_set_is_anonymous(set))
7378                 return -EOPNOTSUPP;
7379
7380         if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7381                 return -EBUSY;
7382
7383         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7384
7385         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7386                 return nft_set_flush(&ctx, set, genmask);
7387
7388         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7389                 err = nft_del_setelem(&ctx, set, attr);
7390                 if (err == -ENOENT &&
7391                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7392                         continue;
7393
7394                 if (err < 0) {
7395                         NL_SET_BAD_ATTR(extack, attr);
7396                         return err;
7397                 }
7398         }
7399
7400         return 0;
7401 }
7402
7403 /*
7404  * Stateful objects
7405  */
7406
7407 /**
7408  *      nft_register_obj- register nf_tables stateful object type
7409  *      @obj_type: object type
7410  *
7411  *      Registers the object type for use with nf_tables. Returns zero on
7412  *      success or a negative errno code otherwise.
7413  */
7414 int nft_register_obj(struct nft_object_type *obj_type)
7415 {
7416         if (obj_type->type == NFT_OBJECT_UNSPEC)
7417                 return -EINVAL;
7418
7419         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7420         list_add_rcu(&obj_type->list, &nf_tables_objects);
7421         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7422         return 0;
7423 }
7424 EXPORT_SYMBOL_GPL(nft_register_obj);
7425
7426 /**
7427  *      nft_unregister_obj - unregister nf_tables object type
7428  *      @obj_type: object type
7429  *
7430  *      Unregisters the object type for use with nf_tables.
7431  */
7432 void nft_unregister_obj(struct nft_object_type *obj_type)
7433 {
7434         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7435         list_del_rcu(&obj_type->list);
7436         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7437 }
7438 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7439
7440 struct nft_object *nft_obj_lookup(const struct net *net,
7441                                   const struct nft_table *table,
7442                                   const struct nlattr *nla, u32 objtype,
7443                                   u8 genmask)
7444 {
7445         struct nft_object_hash_key k = { .table = table };
7446         char search[NFT_OBJ_MAXNAMELEN];
7447         struct rhlist_head *tmp, *list;
7448         struct nft_object *obj;
7449
7450         nla_strscpy(search, nla, sizeof(search));
7451         k.name = search;
7452
7453         WARN_ON_ONCE(!rcu_read_lock_held() &&
7454                      !lockdep_commit_lock_is_held(net));
7455
7456         rcu_read_lock();
7457         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7458         if (!list)
7459                 goto out;
7460
7461         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7462                 if (objtype == obj->ops->type->type &&
7463                     nft_active_genmask(obj, genmask)) {
7464                         rcu_read_unlock();
7465                         return obj;
7466                 }
7467         }
7468 out:
7469         rcu_read_unlock();
7470         return ERR_PTR(-ENOENT);
7471 }
7472 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7473
7474 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7475                                                   const struct nlattr *nla,
7476                                                   u32 objtype, u8 genmask)
7477 {
7478         struct nft_object *obj;
7479
7480         list_for_each_entry(obj, &table->objects, list) {
7481                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7482                     objtype == obj->ops->type->type &&
7483                     nft_active_genmask(obj, genmask))
7484                         return obj;
7485         }
7486         return ERR_PTR(-ENOENT);
7487 }
7488
7489 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7490         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7491                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7492         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7493                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7494         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7495         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7496         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7497         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7498                                     .len = NFT_USERDATA_MAXLEN },
7499 };
7500
7501 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7502                                        const struct nft_object_type *type,
7503                                        const struct nlattr *attr)
7504 {
7505         struct nlattr **tb;
7506         const struct nft_object_ops *ops;
7507         struct nft_object *obj;
7508         int err = -ENOMEM;
7509
7510         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7511         if (!tb)
7512                 goto err1;
7513
7514         if (attr) {
7515                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7516                                                   type->policy, NULL);
7517                 if (err < 0)
7518                         goto err2;
7519         } else {
7520                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7521         }
7522
7523         if (type->select_ops) {
7524                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7525                 if (IS_ERR(ops)) {
7526                         err = PTR_ERR(ops);
7527                         goto err2;
7528                 }
7529         } else {
7530                 ops = type->ops;
7531         }
7532
7533         err = -ENOMEM;
7534         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7535         if (!obj)
7536                 goto err2;
7537
7538         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7539         if (err < 0)
7540                 goto err3;
7541
7542         obj->ops = ops;
7543
7544         kfree(tb);
7545         return obj;
7546 err3:
7547         kfree(obj);
7548 err2:
7549         kfree(tb);
7550 err1:
7551         return ERR_PTR(err);
7552 }
7553
7554 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7555                            struct nft_object *obj, bool reset)
7556 {
7557         struct nlattr *nest;
7558
7559         nest = nla_nest_start_noflag(skb, attr);
7560         if (!nest)
7561                 goto nla_put_failure;
7562         if (obj->ops->dump(skb, obj, reset) < 0)
7563                 goto nla_put_failure;
7564         nla_nest_end(skb, nest);
7565         return 0;
7566
7567 nla_put_failure:
7568         return -1;
7569 }
7570
7571 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7572 {
7573         const struct nft_object_type *type;
7574
7575         list_for_each_entry(type, &nf_tables_objects, list) {
7576                 if (type->family != NFPROTO_UNSPEC &&
7577                     type->family != family)
7578                         continue;
7579
7580                 if (objtype == type->type)
7581                         return type;
7582         }
7583         return NULL;
7584 }
7585
7586 static const struct nft_object_type *
7587 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7588 {
7589         const struct nft_object_type *type;
7590
7591         type = __nft_obj_type_get(objtype, family);
7592         if (type != NULL && try_module_get(type->owner))
7593                 return type;
7594
7595         lockdep_nfnl_nft_mutex_not_held();
7596 #ifdef CONFIG_MODULES
7597         if (type == NULL) {
7598                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7599                         return ERR_PTR(-EAGAIN);
7600         }
7601 #endif
7602         return ERR_PTR(-ENOENT);
7603 }
7604
7605 static int nf_tables_updobj(const struct nft_ctx *ctx,
7606                             const struct nft_object_type *type,
7607                             const struct nlattr *attr,
7608                             struct nft_object *obj)
7609 {
7610         struct nft_object *newobj;
7611         struct nft_trans *trans;
7612         int err = -ENOMEM;
7613
7614         if (!try_module_get(type->owner))
7615                 return -ENOENT;
7616
7617         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7618                                 sizeof(struct nft_trans_obj));
7619         if (!trans)
7620                 goto err_trans;
7621
7622         newobj = nft_obj_init(ctx, type, attr);
7623         if (IS_ERR(newobj)) {
7624                 err = PTR_ERR(newobj);
7625                 goto err_free_trans;
7626         }
7627
7628         nft_trans_obj(trans) = obj;
7629         nft_trans_obj_update(trans) = true;
7630         nft_trans_obj_newobj(trans) = newobj;
7631         nft_trans_commit_list_add_tail(ctx->net, trans);
7632
7633         return 0;
7634
7635 err_free_trans:
7636         kfree(trans);
7637 err_trans:
7638         module_put(type->owner);
7639         return err;
7640 }
7641
7642 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7643                             const struct nlattr * const nla[])
7644 {
7645         struct netlink_ext_ack *extack = info->extack;
7646         u8 genmask = nft_genmask_next(info->net);
7647         u8 family = info->nfmsg->nfgen_family;
7648         const struct nft_object_type *type;
7649         struct net *net = info->net;
7650         struct nft_table *table;
7651         struct nft_object *obj;
7652         struct nft_ctx ctx;
7653         u32 objtype;
7654         int err;
7655
7656         if (!nla[NFTA_OBJ_TYPE] ||
7657             !nla[NFTA_OBJ_NAME] ||
7658             !nla[NFTA_OBJ_DATA])
7659                 return -EINVAL;
7660
7661         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7662                                  NETLINK_CB(skb).portid);
7663         if (IS_ERR(table)) {
7664                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7665                 return PTR_ERR(table);
7666         }
7667
7668         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7669         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7670         if (IS_ERR(obj)) {
7671                 err = PTR_ERR(obj);
7672                 if (err != -ENOENT) {
7673                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7674                         return err;
7675                 }
7676         } else {
7677                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7678                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7679                         return -EEXIST;
7680                 }
7681                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7682                         return -EOPNOTSUPP;
7683
7684                 type = __nft_obj_type_get(objtype, family);
7685                 if (WARN_ON_ONCE(!type))
7686                         return -ENOENT;
7687
7688                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7689
7690                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7691         }
7692
7693         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7694
7695         if (!nft_use_inc(&table->use))
7696                 return -EMFILE;
7697
7698         type = nft_obj_type_get(net, objtype, family);
7699         if (IS_ERR(type)) {
7700                 err = PTR_ERR(type);
7701                 goto err_type;
7702         }
7703
7704         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7705         if (IS_ERR(obj)) {
7706                 err = PTR_ERR(obj);
7707                 goto err_init;
7708         }
7709         obj->key.table = table;
7710         obj->handle = nf_tables_alloc_handle(table);
7711
7712         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7713         if (!obj->key.name) {
7714                 err = -ENOMEM;
7715                 goto err_strdup;
7716         }
7717
7718         if (nla[NFTA_OBJ_USERDATA]) {
7719                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7720                 if (obj->udata == NULL)
7721                         goto err_userdata;
7722
7723                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7724         }
7725
7726         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7727         if (err < 0)
7728                 goto err_trans;
7729
7730         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7731                               nft_objname_ht_params);
7732         if (err < 0)
7733                 goto err_obj_ht;
7734
7735         list_add_tail_rcu(&obj->list, &table->objects);
7736
7737         return 0;
7738 err_obj_ht:
7739         /* queued in transaction log */
7740         INIT_LIST_HEAD(&obj->list);
7741         return err;
7742 err_trans:
7743         kfree(obj->udata);
7744 err_userdata:
7745         kfree(obj->key.name);
7746 err_strdup:
7747         if (obj->ops->destroy)
7748                 obj->ops->destroy(&ctx, obj);
7749         kfree(obj);
7750 err_init:
7751         module_put(type->owner);
7752 err_type:
7753         nft_use_dec_restore(&table->use);
7754
7755         return err;
7756 }
7757
7758 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7759                                    u32 portid, u32 seq, int event, u32 flags,
7760                                    int family, const struct nft_table *table,
7761                                    struct nft_object *obj, bool reset)
7762 {
7763         struct nlmsghdr *nlh;
7764
7765         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7766         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7767                            NFNETLINK_V0, nft_base_seq(net));
7768         if (!nlh)
7769                 goto nla_put_failure;
7770
7771         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7772             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7773             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7774                          NFTA_OBJ_PAD))
7775                 goto nla_put_failure;
7776
7777         if (event == NFT_MSG_DELOBJ) {
7778                 nlmsg_end(skb, nlh);
7779                 return 0;
7780         }
7781
7782         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7783             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7784             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7785                 goto nla_put_failure;
7786
7787         if (obj->udata &&
7788             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7789                 goto nla_put_failure;
7790
7791         nlmsg_end(skb, nlh);
7792         return 0;
7793
7794 nla_put_failure:
7795         nlmsg_trim(skb, nlh);
7796         return -1;
7797 }
7798
7799 static void audit_log_obj_reset(const struct nft_table *table,
7800                                 unsigned int base_seq, unsigned int nentries)
7801 {
7802         char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7803
7804         audit_log_nfcfg(buf, table->family, nentries,
7805                         AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7806         kfree(buf);
7807 }
7808
7809 struct nft_obj_dump_ctx {
7810         unsigned int    s_idx;
7811         char            *table;
7812         u32             type;
7813         bool            reset;
7814 };
7815
7816 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7817 {
7818         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7819         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7820         struct net *net = sock_net(skb->sk);
7821         int family = nfmsg->nfgen_family;
7822         struct nftables_pernet *nft_net;
7823         const struct nft_table *table;
7824         unsigned int entries = 0;
7825         struct nft_object *obj;
7826         unsigned int idx = 0;
7827         int rc = 0;
7828
7829         rcu_read_lock();
7830         nft_net = nft_pernet(net);
7831         cb->seq = READ_ONCE(nft_net->base_seq);
7832
7833         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7834                 if (family != NFPROTO_UNSPEC && family != table->family)
7835                         continue;
7836
7837                 entries = 0;
7838                 list_for_each_entry_rcu(obj, &table->objects, list) {
7839                         if (!nft_is_active(net, obj))
7840                                 goto cont;
7841                         if (idx < ctx->s_idx)
7842                                 goto cont;
7843                         if (ctx->table && strcmp(ctx->table, table->name))
7844                                 goto cont;
7845                         if (ctx->type != NFT_OBJECT_UNSPEC &&
7846                             obj->ops->type->type != ctx->type)
7847                                 goto cont;
7848
7849                         rc = nf_tables_fill_obj_info(skb, net,
7850                                                      NETLINK_CB(cb->skb).portid,
7851                                                      cb->nlh->nlmsg_seq,
7852                                                      NFT_MSG_NEWOBJ,
7853                                                      NLM_F_MULTI | NLM_F_APPEND,
7854                                                      table->family, table,
7855                                                      obj, ctx->reset);
7856                         if (rc < 0)
7857                                 break;
7858
7859                         entries++;
7860                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7861 cont:
7862                         idx++;
7863                 }
7864                 if (ctx->reset && entries)
7865                         audit_log_obj_reset(table, nft_net->base_seq, entries);
7866                 if (rc < 0)
7867                         break;
7868         }
7869         rcu_read_unlock();
7870
7871         ctx->s_idx = idx;
7872         return skb->len;
7873 }
7874
7875 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7876 {
7877         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7878         const struct nlattr * const *nla = cb->data;
7879
7880         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7881
7882         if (nla[NFTA_OBJ_TABLE]) {
7883                 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7884                 if (!ctx->table)
7885                         return -ENOMEM;
7886         }
7887
7888         if (nla[NFTA_OBJ_TYPE])
7889                 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7890
7891         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7892                 ctx->reset = true;
7893
7894         return 0;
7895 }
7896
7897 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7898 {
7899         struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7900
7901         kfree(ctx->table);
7902
7903         return 0;
7904 }
7905
7906 /* called with rcu_read_lock held */
7907 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7908                             const struct nlattr * const nla[])
7909 {
7910         struct netlink_ext_ack *extack = info->extack;
7911         u8 genmask = nft_genmask_cur(info->net);
7912         u8 family = info->nfmsg->nfgen_family;
7913         const struct nft_table *table;
7914         struct net *net = info->net;
7915         struct nft_object *obj;
7916         struct sk_buff *skb2;
7917         bool reset = false;
7918         u32 objtype;
7919         int err;
7920
7921         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7922                 struct netlink_dump_control c = {
7923                         .start = nf_tables_dump_obj_start,
7924                         .dump = nf_tables_dump_obj,
7925                         .done = nf_tables_dump_obj_done,
7926                         .module = THIS_MODULE,
7927                         .data = (void *)nla,
7928                 };
7929
7930                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7931         }
7932
7933         if (!nla[NFTA_OBJ_NAME] ||
7934             !nla[NFTA_OBJ_TYPE])
7935                 return -EINVAL;
7936
7937         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7938         if (IS_ERR(table)) {
7939                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7940                 return PTR_ERR(table);
7941         }
7942
7943         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7944         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7945         if (IS_ERR(obj)) {
7946                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7947                 return PTR_ERR(obj);
7948         }
7949
7950         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7951         if (!skb2)
7952                 return -ENOMEM;
7953
7954         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7955                 reset = true;
7956
7957         if (reset) {
7958                 const struct nftables_pernet *nft_net;
7959                 char *buf;
7960
7961                 nft_net = nft_pernet(net);
7962                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7963
7964                 audit_log_nfcfg(buf,
7965                                 family,
7966                                 1,
7967                                 AUDIT_NFT_OP_OBJ_RESET,
7968                                 GFP_ATOMIC);
7969                 kfree(buf);
7970         }
7971
7972         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7973                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7974                                       family, table, obj, reset);
7975         if (err < 0)
7976                 goto err_fill_obj_info;
7977
7978         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7979
7980 err_fill_obj_info:
7981         kfree_skb(skb2);
7982         return err;
7983 }
7984
7985 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7986 {
7987         if (obj->ops->destroy)
7988                 obj->ops->destroy(ctx, obj);
7989
7990         module_put(obj->ops->type->owner);
7991         kfree(obj->key.name);
7992         kfree(obj->udata);
7993         kfree(obj);
7994 }
7995
7996 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7997                             const struct nlattr * const nla[])
7998 {
7999         struct netlink_ext_ack *extack = info->extack;
8000         u8 genmask = nft_genmask_next(info->net);
8001         u8 family = info->nfmsg->nfgen_family;
8002         struct net *net = info->net;
8003         const struct nlattr *attr;
8004         struct nft_table *table;
8005         struct nft_object *obj;
8006         struct nft_ctx ctx;
8007         u32 objtype;
8008
8009         if (!nla[NFTA_OBJ_TYPE] ||
8010             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
8011                 return -EINVAL;
8012
8013         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
8014                                  NETLINK_CB(skb).portid);
8015         if (IS_ERR(table)) {
8016                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8017                 return PTR_ERR(table);
8018         }
8019
8020         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8021         if (nla[NFTA_OBJ_HANDLE]) {
8022                 attr = nla[NFTA_OBJ_HANDLE];
8023                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
8024         } else {
8025                 attr = nla[NFTA_OBJ_NAME];
8026                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8027         }
8028
8029         if (IS_ERR(obj)) {
8030                 if (PTR_ERR(obj) == -ENOENT &&
8031                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8032                         return 0;
8033
8034                 NL_SET_BAD_ATTR(extack, attr);
8035                 return PTR_ERR(obj);
8036         }
8037         if (obj->use > 0) {
8038                 NL_SET_BAD_ATTR(extack, attr);
8039                 return -EBUSY;
8040         }
8041
8042         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8043
8044         return nft_delobj(&ctx, obj);
8045 }
8046
8047 static void
8048 __nft_obj_notify(struct net *net, const struct nft_table *table,
8049                  struct nft_object *obj, u32 portid, u32 seq, int event,
8050                  u16 flags, int family, int report, gfp_t gfp)
8051 {
8052         struct nftables_pernet *nft_net = nft_pernet(net);
8053         struct sk_buff *skb;
8054         int err;
8055
8056         if (!report &&
8057             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8058                 return;
8059
8060         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8061         if (skb == NULL)
8062                 goto err;
8063
8064         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8065                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
8066                                       family, table, obj, false);
8067         if (err < 0) {
8068                 kfree_skb(skb);
8069                 goto err;
8070         }
8071
8072         nft_notify_enqueue(skb, report, &nft_net->notify_list);
8073         return;
8074 err:
8075         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8076 }
8077
8078 void nft_obj_notify(struct net *net, const struct nft_table *table,
8079                     struct nft_object *obj, u32 portid, u32 seq, int event,
8080                     u16 flags, int family, int report, gfp_t gfp)
8081 {
8082         struct nftables_pernet *nft_net = nft_pernet(net);
8083         char *buf = kasprintf(gfp, "%s:%u",
8084                               table->name, nft_net->base_seq);
8085
8086         audit_log_nfcfg(buf,
8087                         family,
8088                         obj->handle,
8089                         event == NFT_MSG_NEWOBJ ?
8090                                  AUDIT_NFT_OP_OBJ_REGISTER :
8091                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
8092                         gfp);
8093         kfree(buf);
8094
8095         __nft_obj_notify(net, table, obj, portid, seq, event,
8096                          flags, family, report, gfp);
8097 }
8098 EXPORT_SYMBOL_GPL(nft_obj_notify);
8099
8100 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8101                                  struct nft_object *obj, int event)
8102 {
8103         __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8104                          ctx->seq, event, ctx->flags, ctx->family,
8105                          ctx->report, GFP_KERNEL);
8106 }
8107
8108 /*
8109  * Flow tables
8110  */
8111 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8112 {
8113         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8114         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8115         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8116 }
8117 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8118
8119 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8120 {
8121         nfnl_lock(NFNL_SUBSYS_NFTABLES);
8122         list_del_rcu(&type->list);
8123         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8124 }
8125 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8126
8127 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8128         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
8129                                             .len = NFT_NAME_MAXLEN - 1 },
8130         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
8131                                             .len = NFT_NAME_MAXLEN - 1 },
8132         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
8133         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
8134         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
8135 };
8136
8137 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8138                                            const struct nlattr *nla, u8 genmask)
8139 {
8140         struct nft_flowtable *flowtable;
8141
8142         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8143                 if (!nla_strcmp(nla, flowtable->name) &&
8144                     nft_active_genmask(flowtable, genmask))
8145                         return flowtable;
8146         }
8147         return ERR_PTR(-ENOENT);
8148 }
8149 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8150
8151 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8152                                     struct nft_flowtable *flowtable,
8153                                     enum nft_trans_phase phase)
8154 {
8155         switch (phase) {
8156         case NFT_TRANS_PREPARE_ERROR:
8157         case NFT_TRANS_PREPARE:
8158         case NFT_TRANS_ABORT:
8159         case NFT_TRANS_RELEASE:
8160                 nft_use_dec(&flowtable->use);
8161                 fallthrough;
8162         default:
8163                 return;
8164         }
8165 }
8166 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8167
8168 static struct nft_flowtable *
8169 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8170                               const struct nlattr *nla, u8 genmask)
8171 {
8172        struct nft_flowtable *flowtable;
8173
8174        list_for_each_entry(flowtable, &table->flowtables, list) {
8175                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8176                    nft_active_genmask(flowtable, genmask))
8177                        return flowtable;
8178        }
8179        return ERR_PTR(-ENOENT);
8180 }
8181
8182 struct nft_flowtable_hook {
8183         u32                     num;
8184         int                     priority;
8185         struct list_head        list;
8186 };
8187
8188 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8189         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
8190         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
8191         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
8192 };
8193
8194 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8195                                     const struct nlattr * const nla[],
8196                                     struct nft_flowtable_hook *flowtable_hook,
8197                                     struct nft_flowtable *flowtable,
8198                                     struct netlink_ext_ack *extack, bool add)
8199 {
8200         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8201         struct nft_hook *hook;
8202         int hooknum, priority;
8203         int err;
8204
8205         INIT_LIST_HEAD(&flowtable_hook->list);
8206
8207         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8208                                           nla[NFTA_FLOWTABLE_HOOK],
8209                                           nft_flowtable_hook_policy, NULL);
8210         if (err < 0)
8211                 return err;
8212
8213         if (add) {
8214                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8215                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8216                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8217                         return -ENOENT;
8218                 }
8219
8220                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8221                 if (hooknum != NF_NETDEV_INGRESS)
8222                         return -EOPNOTSUPP;
8223
8224                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8225
8226                 flowtable_hook->priority        = priority;
8227                 flowtable_hook->num             = hooknum;
8228         } else {
8229                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8230                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8231                         if (hooknum != flowtable->hooknum)
8232                                 return -EOPNOTSUPP;
8233                 }
8234
8235                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8236                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8237                         if (priority != flowtable->data.priority)
8238                                 return -EOPNOTSUPP;
8239                 }
8240
8241                 flowtable_hook->priority        = flowtable->data.priority;
8242                 flowtable_hook->num             = flowtable->hooknum;
8243         }
8244
8245         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8246                 err = nf_tables_parse_netdev_hooks(ctx->net,
8247                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8248                                                    &flowtable_hook->list,
8249                                                    extack);
8250                 if (err < 0)
8251                         return err;
8252         }
8253
8254         list_for_each_entry(hook, &flowtable_hook->list, list) {
8255                 hook->ops.pf            = NFPROTO_NETDEV;
8256                 hook->ops.hooknum       = flowtable_hook->num;
8257                 hook->ops.priority      = flowtable_hook->priority;
8258                 hook->ops.priv          = &flowtable->data;
8259                 hook->ops.hook          = flowtable->data.type->hook;
8260         }
8261
8262         return err;
8263 }
8264
8265 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8266 {
8267         const struct nf_flowtable_type *type;
8268
8269         list_for_each_entry(type, &nf_tables_flowtables, list) {
8270                 if (family == type->family)
8271                         return type;
8272         }
8273         return NULL;
8274 }
8275
8276 static const struct nf_flowtable_type *
8277 nft_flowtable_type_get(struct net *net, u8 family)
8278 {
8279         const struct nf_flowtable_type *type;
8280
8281         type = __nft_flowtable_type_get(family);
8282         if (type != NULL && try_module_get(type->owner))
8283                 return type;
8284
8285         lockdep_nfnl_nft_mutex_not_held();
8286 #ifdef CONFIG_MODULES
8287         if (type == NULL) {
8288                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8289                         return ERR_PTR(-EAGAIN);
8290         }
8291 #endif
8292         return ERR_PTR(-ENOENT);
8293 }
8294
8295 /* Only called from error and netdev event paths. */
8296 static void nft_unregister_flowtable_hook(struct net *net,
8297                                           struct nft_flowtable *flowtable,
8298                                           struct nft_hook *hook)
8299 {
8300         nf_unregister_net_hook(net, &hook->ops);
8301         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8302                                     FLOW_BLOCK_UNBIND);
8303 }
8304
8305 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8306                                                  struct list_head *hook_list,
8307                                                  bool release_netdev)
8308 {
8309         struct nft_hook *hook, *next;
8310
8311         list_for_each_entry_safe(hook, next, hook_list, list) {
8312                 nf_unregister_net_hook(net, &hook->ops);
8313                 if (release_netdev) {
8314                         list_del(&hook->list);
8315                         kfree_rcu(hook, rcu);
8316                 }
8317         }
8318 }
8319
8320 static void nft_unregister_flowtable_net_hooks(struct net *net,
8321                                                struct list_head *hook_list)
8322 {
8323         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8324 }
8325
8326 static int nft_register_flowtable_net_hooks(struct net *net,
8327                                             struct nft_table *table,
8328                                             struct list_head *hook_list,
8329                                             struct nft_flowtable *flowtable)
8330 {
8331         struct nft_hook *hook, *hook2, *next;
8332         struct nft_flowtable *ft;
8333         int err, i = 0;
8334
8335         list_for_each_entry(hook, hook_list, list) {
8336                 list_for_each_entry(ft, &table->flowtables, list) {
8337                         if (!nft_is_active_next(net, ft))
8338                                 continue;
8339
8340                         list_for_each_entry(hook2, &ft->hook_list, list) {
8341                                 if (hook->ops.dev == hook2->ops.dev &&
8342                                     hook->ops.pf == hook2->ops.pf) {
8343                                         err = -EEXIST;
8344                                         goto err_unregister_net_hooks;
8345                                 }
8346                         }
8347                 }
8348
8349                 err = flowtable->data.type->setup(&flowtable->data,
8350                                                   hook->ops.dev,
8351                                                   FLOW_BLOCK_BIND);
8352                 if (err < 0)
8353                         goto err_unregister_net_hooks;
8354
8355                 err = nf_register_net_hook(net, &hook->ops);
8356                 if (err < 0) {
8357                         flowtable->data.type->setup(&flowtable->data,
8358                                                     hook->ops.dev,
8359                                                     FLOW_BLOCK_UNBIND);
8360                         goto err_unregister_net_hooks;
8361                 }
8362
8363                 i++;
8364         }
8365
8366         return 0;
8367
8368 err_unregister_net_hooks:
8369         list_for_each_entry_safe(hook, next, hook_list, list) {
8370                 if (i-- <= 0)
8371                         break;
8372
8373                 nft_unregister_flowtable_hook(net, flowtable, hook);
8374                 list_del_rcu(&hook->list);
8375                 kfree_rcu(hook, rcu);
8376         }
8377
8378         return err;
8379 }
8380
8381 static void nft_hooks_destroy(struct list_head *hook_list)
8382 {
8383         struct nft_hook *hook, *next;
8384
8385         list_for_each_entry_safe(hook, next, hook_list, list) {
8386                 list_del_rcu(&hook->list);
8387                 kfree_rcu(hook, rcu);
8388         }
8389 }
8390
8391 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8392                                 struct nft_flowtable *flowtable,
8393                                 struct netlink_ext_ack *extack)
8394 {
8395         const struct nlattr * const *nla = ctx->nla;
8396         struct nft_flowtable_hook flowtable_hook;
8397         struct nft_hook *hook, *next;
8398         struct nft_trans *trans;
8399         bool unregister = false;
8400         u32 flags;
8401         int err;
8402
8403         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8404                                        extack, false);
8405         if (err < 0)
8406                 return err;
8407
8408         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8409                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8410                         list_del(&hook->list);
8411                         kfree(hook);
8412                 }
8413         }
8414
8415         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8416                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8417                 if (flags & ~NFT_FLOWTABLE_MASK) {
8418                         err = -EOPNOTSUPP;
8419                         goto err_flowtable_update_hook;
8420                 }
8421                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8422                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8423                         err = -EOPNOTSUPP;
8424                         goto err_flowtable_update_hook;
8425                 }
8426         } else {
8427                 flags = flowtable->data.flags;
8428         }
8429
8430         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8431                                                &flowtable_hook.list, flowtable);
8432         if (err < 0)
8433                 goto err_flowtable_update_hook;
8434
8435         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8436                                 sizeof(struct nft_trans_flowtable));
8437         if (!trans) {
8438                 unregister = true;
8439                 err = -ENOMEM;
8440                 goto err_flowtable_update_hook;
8441         }
8442
8443         nft_trans_flowtable_flags(trans) = flags;
8444         nft_trans_flowtable(trans) = flowtable;
8445         nft_trans_flowtable_update(trans) = true;
8446         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8447         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8448
8449         nft_trans_commit_list_add_tail(ctx->net, trans);
8450
8451         return 0;
8452
8453 err_flowtable_update_hook:
8454         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8455                 if (unregister)
8456                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8457                 list_del_rcu(&hook->list);
8458                 kfree_rcu(hook, rcu);
8459         }
8460
8461         return err;
8462
8463 }
8464
8465 static int nf_tables_newflowtable(struct sk_buff *skb,
8466                                   const struct nfnl_info *info,
8467                                   const struct nlattr * const nla[])
8468 {
8469         struct netlink_ext_ack *extack = info->extack;
8470         struct nft_flowtable_hook flowtable_hook;
8471         u8 genmask = nft_genmask_next(info->net);
8472         u8 family = info->nfmsg->nfgen_family;
8473         const struct nf_flowtable_type *type;
8474         struct nft_flowtable *flowtable;
8475         struct net *net = info->net;
8476         struct nft_table *table;
8477         struct nft_trans *trans;
8478         struct nft_ctx ctx;
8479         int err;
8480
8481         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8482             !nla[NFTA_FLOWTABLE_NAME] ||
8483             !nla[NFTA_FLOWTABLE_HOOK])
8484                 return -EINVAL;
8485
8486         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8487                                  genmask, NETLINK_CB(skb).portid);
8488         if (IS_ERR(table)) {
8489                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8490                 return PTR_ERR(table);
8491         }
8492
8493         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8494                                          genmask);
8495         if (IS_ERR(flowtable)) {
8496                 err = PTR_ERR(flowtable);
8497                 if (err != -ENOENT) {
8498                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8499                         return err;
8500                 }
8501         } else {
8502                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8503                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8504                         return -EEXIST;
8505                 }
8506
8507                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8508
8509                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8510         }
8511
8512         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8513
8514         if (!nft_use_inc(&table->use))
8515                 return -EMFILE;
8516
8517         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8518         if (!flowtable) {
8519                 err = -ENOMEM;
8520                 goto flowtable_alloc;
8521         }
8522
8523         flowtable->table = table;
8524         flowtable->handle = nf_tables_alloc_handle(table);
8525         INIT_LIST_HEAD(&flowtable->hook_list);
8526
8527         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8528         if (!flowtable->name) {
8529                 err = -ENOMEM;
8530                 goto err1;
8531         }
8532
8533         type = nft_flowtable_type_get(net, family);
8534         if (IS_ERR(type)) {
8535                 err = PTR_ERR(type);
8536                 goto err2;
8537         }
8538
8539         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8540                 flowtable->data.flags =
8541                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8542                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8543                         err = -EOPNOTSUPP;
8544                         goto err3;
8545                 }
8546         }
8547
8548         write_pnet(&flowtable->data.net, net);
8549         flowtable->data.type = type;
8550         err = type->init(&flowtable->data);
8551         if (err < 0)
8552                 goto err3;
8553
8554         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8555                                        extack, true);
8556         if (err < 0)
8557                 goto err_flowtable_parse_hooks;
8558
8559         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8560         flowtable->data.priority = flowtable_hook.priority;
8561         flowtable->hooknum = flowtable_hook.num;
8562
8563         trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8564         if (IS_ERR(trans)) {
8565                 err = PTR_ERR(trans);
8566                 goto err_flowtable_trans;
8567         }
8568
8569         /* This must be LAST to ensure no packets are walking over this flowtable. */
8570         err = nft_register_flowtable_net_hooks(ctx.net, table,
8571                                                &flowtable->hook_list,
8572                                                flowtable);
8573         if (err < 0)
8574                 goto err_flowtable_hooks;
8575
8576         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8577
8578         return 0;
8579
8580 err_flowtable_hooks:
8581         nft_trans_destroy(trans);
8582 err_flowtable_trans:
8583         nft_hooks_destroy(&flowtable->hook_list);
8584 err_flowtable_parse_hooks:
8585         flowtable->data.type->free(&flowtable->data);
8586 err3:
8587         module_put(type->owner);
8588 err2:
8589         kfree(flowtable->name);
8590 err1:
8591         kfree(flowtable);
8592 flowtable_alloc:
8593         nft_use_dec_restore(&table->use);
8594
8595         return err;
8596 }
8597
8598 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8599 {
8600         struct nft_hook *this, *next;
8601
8602         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8603                 list_del(&this->list);
8604                 kfree(this);
8605         }
8606 }
8607
8608 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8609                                  struct nft_flowtable *flowtable,
8610                                  struct netlink_ext_ack *extack)
8611 {
8612         const struct nlattr * const *nla = ctx->nla;
8613         struct nft_flowtable_hook flowtable_hook;
8614         LIST_HEAD(flowtable_del_list);
8615         struct nft_hook *this, *hook;
8616         struct nft_trans *trans;
8617         int err;
8618
8619         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8620                                        extack, false);
8621         if (err < 0)
8622                 return err;
8623
8624         list_for_each_entry(this, &flowtable_hook.list, list) {
8625                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8626                 if (!hook) {
8627                         err = -ENOENT;
8628                         goto err_flowtable_del_hook;
8629                 }
8630                 list_move(&hook->list, &flowtable_del_list);
8631         }
8632
8633         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8634                                 sizeof(struct nft_trans_flowtable));
8635         if (!trans) {
8636                 err = -ENOMEM;
8637                 goto err_flowtable_del_hook;
8638         }
8639
8640         nft_trans_flowtable(trans) = flowtable;
8641         nft_trans_flowtable_update(trans) = true;
8642         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8643         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8644         nft_flowtable_hook_release(&flowtable_hook);
8645
8646         nft_trans_commit_list_add_tail(ctx->net, trans);
8647
8648         return 0;
8649
8650 err_flowtable_del_hook:
8651         list_splice(&flowtable_del_list, &flowtable->hook_list);
8652         nft_flowtable_hook_release(&flowtable_hook);
8653
8654         return err;
8655 }
8656
8657 static int nf_tables_delflowtable(struct sk_buff *skb,
8658                                   const struct nfnl_info *info,
8659                                   const struct nlattr * const nla[])
8660 {
8661         struct netlink_ext_ack *extack = info->extack;
8662         u8 genmask = nft_genmask_next(info->net);
8663         u8 family = info->nfmsg->nfgen_family;
8664         struct nft_flowtable *flowtable;
8665         struct net *net = info->net;
8666         const struct nlattr *attr;
8667         struct nft_table *table;
8668         struct nft_ctx ctx;
8669
8670         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8671             (!nla[NFTA_FLOWTABLE_NAME] &&
8672              !nla[NFTA_FLOWTABLE_HANDLE]))
8673                 return -EINVAL;
8674
8675         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8676                                  genmask, NETLINK_CB(skb).portid);
8677         if (IS_ERR(table)) {
8678                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8679                 return PTR_ERR(table);
8680         }
8681
8682         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8683                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8684                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8685         } else {
8686                 attr = nla[NFTA_FLOWTABLE_NAME];
8687                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8688         }
8689
8690         if (IS_ERR(flowtable)) {
8691                 if (PTR_ERR(flowtable) == -ENOENT &&
8692                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8693                         return 0;
8694
8695                 NL_SET_BAD_ATTR(extack, attr);
8696                 return PTR_ERR(flowtable);
8697         }
8698
8699         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8700
8701         if (nla[NFTA_FLOWTABLE_HOOK])
8702                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8703
8704         if (flowtable->use > 0) {
8705                 NL_SET_BAD_ATTR(extack, attr);
8706                 return -EBUSY;
8707         }
8708
8709         return nft_delflowtable(&ctx, flowtable);
8710 }
8711
8712 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8713                                          u32 portid, u32 seq, int event,
8714                                          u32 flags, int family,
8715                                          struct nft_flowtable *flowtable,
8716                                          struct list_head *hook_list)
8717 {
8718         struct nlattr *nest, *nest_devs;
8719         struct nft_hook *hook;
8720         struct nlmsghdr *nlh;
8721
8722         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8723         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8724                            NFNETLINK_V0, nft_base_seq(net));
8725         if (!nlh)
8726                 goto nla_put_failure;
8727
8728         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8729             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8730             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8731                          NFTA_FLOWTABLE_PAD))
8732                 goto nla_put_failure;
8733
8734         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8735                 nlmsg_end(skb, nlh);
8736                 return 0;
8737         }
8738
8739         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8740             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8741                 goto nla_put_failure;
8742
8743         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8744         if (!nest)
8745                 goto nla_put_failure;
8746         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8747             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8748                 goto nla_put_failure;
8749
8750         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8751         if (!nest_devs)
8752                 goto nla_put_failure;
8753
8754         if (!hook_list)
8755                 hook_list = &flowtable->hook_list;
8756
8757         list_for_each_entry_rcu(hook, hook_list, list) {
8758                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8759                         goto nla_put_failure;
8760         }
8761         nla_nest_end(skb, nest_devs);
8762         nla_nest_end(skb, nest);
8763
8764         nlmsg_end(skb, nlh);
8765         return 0;
8766
8767 nla_put_failure:
8768         nlmsg_trim(skb, nlh);
8769         return -1;
8770 }
8771
8772 struct nft_flowtable_filter {
8773         char            *table;
8774 };
8775
8776 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8777                                     struct netlink_callback *cb)
8778 {
8779         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8780         struct nft_flowtable_filter *filter = cb->data;
8781         unsigned int idx = 0, s_idx = cb->args[0];
8782         struct net *net = sock_net(skb->sk);
8783         int family = nfmsg->nfgen_family;
8784         struct nft_flowtable *flowtable;
8785         struct nftables_pernet *nft_net;
8786         const struct nft_table *table;
8787
8788         rcu_read_lock();
8789         nft_net = nft_pernet(net);
8790         cb->seq = READ_ONCE(nft_net->base_seq);
8791
8792         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8793                 if (family != NFPROTO_UNSPEC && family != table->family)
8794                         continue;
8795
8796                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8797                         if (!nft_is_active(net, flowtable))
8798                                 goto cont;
8799                         if (idx < s_idx)
8800                                 goto cont;
8801                         if (idx > s_idx)
8802                                 memset(&cb->args[1], 0,
8803                                        sizeof(cb->args) - sizeof(cb->args[0]));
8804                         if (filter && filter->table &&
8805                             strcmp(filter->table, table->name))
8806                                 goto cont;
8807
8808                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8809                                                           cb->nlh->nlmsg_seq,
8810                                                           NFT_MSG_NEWFLOWTABLE,
8811                                                           NLM_F_MULTI | NLM_F_APPEND,
8812                                                           table->family,
8813                                                           flowtable, NULL) < 0)
8814                                 goto done;
8815
8816                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8817 cont:
8818                         idx++;
8819                 }
8820         }
8821 done:
8822         rcu_read_unlock();
8823
8824         cb->args[0] = idx;
8825         return skb->len;
8826 }
8827
8828 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8829 {
8830         const struct nlattr * const *nla = cb->data;
8831         struct nft_flowtable_filter *filter = NULL;
8832
8833         if (nla[NFTA_FLOWTABLE_TABLE]) {
8834                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8835                 if (!filter)
8836                         return -ENOMEM;
8837
8838                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8839                                            GFP_ATOMIC);
8840                 if (!filter->table) {
8841                         kfree(filter);
8842                         return -ENOMEM;
8843                 }
8844         }
8845
8846         cb->data = filter;
8847         return 0;
8848 }
8849
8850 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8851 {
8852         struct nft_flowtable_filter *filter = cb->data;
8853
8854         if (!filter)
8855                 return 0;
8856
8857         kfree(filter->table);
8858         kfree(filter);
8859
8860         return 0;
8861 }
8862
8863 /* called with rcu_read_lock held */
8864 static int nf_tables_getflowtable(struct sk_buff *skb,
8865                                   const struct nfnl_info *info,
8866                                   const struct nlattr * const nla[])
8867 {
8868         struct netlink_ext_ack *extack = info->extack;
8869         u8 genmask = nft_genmask_cur(info->net);
8870         u8 family = info->nfmsg->nfgen_family;
8871         struct nft_flowtable *flowtable;
8872         const struct nft_table *table;
8873         struct net *net = info->net;
8874         struct sk_buff *skb2;
8875         int err;
8876
8877         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8878                 struct netlink_dump_control c = {
8879                         .start = nf_tables_dump_flowtable_start,
8880                         .dump = nf_tables_dump_flowtable,
8881                         .done = nf_tables_dump_flowtable_done,
8882                         .module = THIS_MODULE,
8883                         .data = (void *)nla,
8884                 };
8885
8886                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8887         }
8888
8889         if (!nla[NFTA_FLOWTABLE_NAME])
8890                 return -EINVAL;
8891
8892         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8893                                  genmask, 0);
8894         if (IS_ERR(table)) {
8895                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8896                 return PTR_ERR(table);
8897         }
8898
8899         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8900                                          genmask);
8901         if (IS_ERR(flowtable)) {
8902                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8903                 return PTR_ERR(flowtable);
8904         }
8905
8906         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8907         if (!skb2)
8908                 return -ENOMEM;
8909
8910         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8911                                             info->nlh->nlmsg_seq,
8912                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8913                                             flowtable, NULL);
8914         if (err < 0)
8915                 goto err_fill_flowtable_info;
8916
8917         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8918
8919 err_fill_flowtable_info:
8920         kfree_skb(skb2);
8921         return err;
8922 }
8923
8924 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8925                                        struct nft_flowtable *flowtable,
8926                                        struct list_head *hook_list, int event)
8927 {
8928         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8929         struct sk_buff *skb;
8930         u16 flags = 0;
8931         int err;
8932
8933         if (!ctx->report &&
8934             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8935                 return;
8936
8937         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8938         if (skb == NULL)
8939                 goto err;
8940
8941         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8942                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8943
8944         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8945                                             ctx->seq, event, flags,
8946                                             ctx->family, flowtable, hook_list);
8947         if (err < 0) {
8948                 kfree_skb(skb);
8949                 goto err;
8950         }
8951
8952         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8953         return;
8954 err:
8955         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8956 }
8957
8958 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8959 {
8960         struct nft_hook *hook, *next;
8961
8962         flowtable->data.type->free(&flowtable->data);
8963         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8964                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8965                                             FLOW_BLOCK_UNBIND);
8966                 list_del_rcu(&hook->list);
8967                 kfree(hook);
8968         }
8969         kfree(flowtable->name);
8970         module_put(flowtable->data.type->owner);
8971         kfree(flowtable);
8972 }
8973
8974 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8975                                    u32 portid, u32 seq)
8976 {
8977         struct nftables_pernet *nft_net = nft_pernet(net);
8978         struct nlmsghdr *nlh;
8979         char buf[TASK_COMM_LEN];
8980         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8981
8982         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8983                            NFNETLINK_V0, nft_base_seq(net));
8984         if (!nlh)
8985                 goto nla_put_failure;
8986
8987         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8988             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8989             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8990                 goto nla_put_failure;
8991
8992         nlmsg_end(skb, nlh);
8993         return 0;
8994
8995 nla_put_failure:
8996         nlmsg_trim(skb, nlh);
8997         return -EMSGSIZE;
8998 }
8999
9000 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
9001                                 struct nft_flowtable *flowtable)
9002 {
9003         struct nft_hook *hook;
9004
9005         list_for_each_entry(hook, &flowtable->hook_list, list) {
9006                 if (hook->ops.dev != dev)
9007                         continue;
9008
9009                 /* flow_offload_netdev_event() cleans up entries for us. */
9010                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
9011                 list_del_rcu(&hook->list);
9012                 kfree_rcu(hook, rcu);
9013                 break;
9014         }
9015 }
9016
9017 static int nf_tables_flowtable_event(struct notifier_block *this,
9018                                      unsigned long event, void *ptr)
9019 {
9020         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
9021         struct nft_flowtable *flowtable;
9022         struct nftables_pernet *nft_net;
9023         struct nft_table *table;
9024         struct net *net;
9025
9026         if (event != NETDEV_UNREGISTER)
9027                 return 0;
9028
9029         net = dev_net(dev);
9030         nft_net = nft_pernet(net);
9031         mutex_lock(&nft_net->commit_mutex);
9032         list_for_each_entry(table, &nft_net->tables, list) {
9033                 list_for_each_entry(flowtable, &table->flowtables, list) {
9034                         nft_flowtable_event(event, dev, flowtable);
9035                 }
9036         }
9037         mutex_unlock(&nft_net->commit_mutex);
9038
9039         return NOTIFY_DONE;
9040 }
9041
9042 static struct notifier_block nf_tables_flowtable_notifier = {
9043         .notifier_call  = nf_tables_flowtable_event,
9044 };
9045
9046 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9047                                  int event)
9048 {
9049         struct nlmsghdr *nlh = nlmsg_hdr(skb);
9050         struct sk_buff *skb2;
9051         int err;
9052
9053         if (!nlmsg_report(nlh) &&
9054             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9055                 return;
9056
9057         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9058         if (skb2 == NULL)
9059                 goto err;
9060
9061         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9062                                       nlh->nlmsg_seq);
9063         if (err < 0) {
9064                 kfree_skb(skb2);
9065                 goto err;
9066         }
9067
9068         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9069                        nlmsg_report(nlh), GFP_KERNEL);
9070         return;
9071 err:
9072         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9073                           -ENOBUFS);
9074 }
9075
9076 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9077                             const struct nlattr * const nla[])
9078 {
9079         struct sk_buff *skb2;
9080         int err;
9081
9082         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9083         if (skb2 == NULL)
9084                 return -ENOMEM;
9085
9086         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9087                                       info->nlh->nlmsg_seq);
9088         if (err < 0)
9089                 goto err_fill_gen_info;
9090
9091         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9092
9093 err_fill_gen_info:
9094         kfree_skb(skb2);
9095         return err;
9096 }
9097
9098 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9099         [NFT_MSG_NEWTABLE] = {
9100                 .call           = nf_tables_newtable,
9101                 .type           = NFNL_CB_BATCH,
9102                 .attr_count     = NFTA_TABLE_MAX,
9103                 .policy         = nft_table_policy,
9104         },
9105         [NFT_MSG_GETTABLE] = {
9106                 .call           = nf_tables_gettable,
9107                 .type           = NFNL_CB_RCU,
9108                 .attr_count     = NFTA_TABLE_MAX,
9109                 .policy         = nft_table_policy,
9110         },
9111         [NFT_MSG_DELTABLE] = {
9112                 .call           = nf_tables_deltable,
9113                 .type           = NFNL_CB_BATCH,
9114                 .attr_count     = NFTA_TABLE_MAX,
9115                 .policy         = nft_table_policy,
9116         },
9117         [NFT_MSG_DESTROYTABLE] = {
9118                 .call           = nf_tables_deltable,
9119                 .type           = NFNL_CB_BATCH,
9120                 .attr_count     = NFTA_TABLE_MAX,
9121                 .policy         = nft_table_policy,
9122         },
9123         [NFT_MSG_NEWCHAIN] = {
9124                 .call           = nf_tables_newchain,
9125                 .type           = NFNL_CB_BATCH,
9126                 .attr_count     = NFTA_CHAIN_MAX,
9127                 .policy         = nft_chain_policy,
9128         },
9129         [NFT_MSG_GETCHAIN] = {
9130                 .call           = nf_tables_getchain,
9131                 .type           = NFNL_CB_RCU,
9132                 .attr_count     = NFTA_CHAIN_MAX,
9133                 .policy         = nft_chain_policy,
9134         },
9135         [NFT_MSG_DELCHAIN] = {
9136                 .call           = nf_tables_delchain,
9137                 .type           = NFNL_CB_BATCH,
9138                 .attr_count     = NFTA_CHAIN_MAX,
9139                 .policy         = nft_chain_policy,
9140         },
9141         [NFT_MSG_DESTROYCHAIN] = {
9142                 .call           = nf_tables_delchain,
9143                 .type           = NFNL_CB_BATCH,
9144                 .attr_count     = NFTA_CHAIN_MAX,
9145                 .policy         = nft_chain_policy,
9146         },
9147         [NFT_MSG_NEWRULE] = {
9148                 .call           = nf_tables_newrule,
9149                 .type           = NFNL_CB_BATCH,
9150                 .attr_count     = NFTA_RULE_MAX,
9151                 .policy         = nft_rule_policy,
9152         },
9153         [NFT_MSG_GETRULE] = {
9154                 .call           = nf_tables_getrule,
9155                 .type           = NFNL_CB_RCU,
9156                 .attr_count     = NFTA_RULE_MAX,
9157                 .policy         = nft_rule_policy,
9158         },
9159         [NFT_MSG_GETRULE_RESET] = {
9160                 .call           = nf_tables_getrule_reset,
9161                 .type           = NFNL_CB_RCU,
9162                 .attr_count     = NFTA_RULE_MAX,
9163                 .policy         = nft_rule_policy,
9164         },
9165         [NFT_MSG_DELRULE] = {
9166                 .call           = nf_tables_delrule,
9167                 .type           = NFNL_CB_BATCH,
9168                 .attr_count     = NFTA_RULE_MAX,
9169                 .policy         = nft_rule_policy,
9170         },
9171         [NFT_MSG_DESTROYRULE] = {
9172                 .call           = nf_tables_delrule,
9173                 .type           = NFNL_CB_BATCH,
9174                 .attr_count     = NFTA_RULE_MAX,
9175                 .policy         = nft_rule_policy,
9176         },
9177         [NFT_MSG_NEWSET] = {
9178                 .call           = nf_tables_newset,
9179                 .type           = NFNL_CB_BATCH,
9180                 .attr_count     = NFTA_SET_MAX,
9181                 .policy         = nft_set_policy,
9182         },
9183         [NFT_MSG_GETSET] = {
9184                 .call           = nf_tables_getset,
9185                 .type           = NFNL_CB_RCU,
9186                 .attr_count     = NFTA_SET_MAX,
9187                 .policy         = nft_set_policy,
9188         },
9189         [NFT_MSG_DELSET] = {
9190                 .call           = nf_tables_delset,
9191                 .type           = NFNL_CB_BATCH,
9192                 .attr_count     = NFTA_SET_MAX,
9193                 .policy         = nft_set_policy,
9194         },
9195         [NFT_MSG_DESTROYSET] = {
9196                 .call           = nf_tables_delset,
9197                 .type           = NFNL_CB_BATCH,
9198                 .attr_count     = NFTA_SET_MAX,
9199                 .policy         = nft_set_policy,
9200         },
9201         [NFT_MSG_NEWSETELEM] = {
9202                 .call           = nf_tables_newsetelem,
9203                 .type           = NFNL_CB_BATCH,
9204                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9205                 .policy         = nft_set_elem_list_policy,
9206         },
9207         [NFT_MSG_GETSETELEM] = {
9208                 .call           = nf_tables_getsetelem,
9209                 .type           = NFNL_CB_RCU,
9210                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9211                 .policy         = nft_set_elem_list_policy,
9212         },
9213         [NFT_MSG_GETSETELEM_RESET] = {
9214                 .call           = nf_tables_getsetelem_reset,
9215                 .type           = NFNL_CB_RCU,
9216                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9217                 .policy         = nft_set_elem_list_policy,
9218         },
9219         [NFT_MSG_DELSETELEM] = {
9220                 .call           = nf_tables_delsetelem,
9221                 .type           = NFNL_CB_BATCH,
9222                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9223                 .policy         = nft_set_elem_list_policy,
9224         },
9225         [NFT_MSG_DESTROYSETELEM] = {
9226                 .call           = nf_tables_delsetelem,
9227                 .type           = NFNL_CB_BATCH,
9228                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9229                 .policy         = nft_set_elem_list_policy,
9230         },
9231         [NFT_MSG_GETGEN] = {
9232                 .call           = nf_tables_getgen,
9233                 .type           = NFNL_CB_RCU,
9234         },
9235         [NFT_MSG_NEWOBJ] = {
9236                 .call           = nf_tables_newobj,
9237                 .type           = NFNL_CB_BATCH,
9238                 .attr_count     = NFTA_OBJ_MAX,
9239                 .policy         = nft_obj_policy,
9240         },
9241         [NFT_MSG_GETOBJ] = {
9242                 .call           = nf_tables_getobj,
9243                 .type           = NFNL_CB_RCU,
9244                 .attr_count     = NFTA_OBJ_MAX,
9245                 .policy         = nft_obj_policy,
9246         },
9247         [NFT_MSG_DELOBJ] = {
9248                 .call           = nf_tables_delobj,
9249                 .type           = NFNL_CB_BATCH,
9250                 .attr_count     = NFTA_OBJ_MAX,
9251                 .policy         = nft_obj_policy,
9252         },
9253         [NFT_MSG_DESTROYOBJ] = {
9254                 .call           = nf_tables_delobj,
9255                 .type           = NFNL_CB_BATCH,
9256                 .attr_count     = NFTA_OBJ_MAX,
9257                 .policy         = nft_obj_policy,
9258         },
9259         [NFT_MSG_GETOBJ_RESET] = {
9260                 .call           = nf_tables_getobj,
9261                 .type           = NFNL_CB_RCU,
9262                 .attr_count     = NFTA_OBJ_MAX,
9263                 .policy         = nft_obj_policy,
9264         },
9265         [NFT_MSG_NEWFLOWTABLE] = {
9266                 .call           = nf_tables_newflowtable,
9267                 .type           = NFNL_CB_BATCH,
9268                 .attr_count     = NFTA_FLOWTABLE_MAX,
9269                 .policy         = nft_flowtable_policy,
9270         },
9271         [NFT_MSG_GETFLOWTABLE] = {
9272                 .call           = nf_tables_getflowtable,
9273                 .type           = NFNL_CB_RCU,
9274                 .attr_count     = NFTA_FLOWTABLE_MAX,
9275                 .policy         = nft_flowtable_policy,
9276         },
9277         [NFT_MSG_DELFLOWTABLE] = {
9278                 .call           = nf_tables_delflowtable,
9279                 .type           = NFNL_CB_BATCH,
9280                 .attr_count     = NFTA_FLOWTABLE_MAX,
9281                 .policy         = nft_flowtable_policy,
9282         },
9283         [NFT_MSG_DESTROYFLOWTABLE] = {
9284                 .call           = nf_tables_delflowtable,
9285                 .type           = NFNL_CB_BATCH,
9286                 .attr_count     = NFTA_FLOWTABLE_MAX,
9287                 .policy         = nft_flowtable_policy,
9288         },
9289 };
9290
9291 static int nf_tables_validate(struct net *net)
9292 {
9293         struct nftables_pernet *nft_net = nft_pernet(net);
9294         struct nft_table *table;
9295
9296         list_for_each_entry(table, &nft_net->tables, list) {
9297                 switch (table->validate_state) {
9298                 case NFT_VALIDATE_SKIP:
9299                         continue;
9300                 case NFT_VALIDATE_NEED:
9301                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9302                         fallthrough;
9303                 case NFT_VALIDATE_DO:
9304                         if (nft_table_validate(net, table) < 0)
9305                                 return -EAGAIN;
9306
9307                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9308                         break;
9309                 }
9310         }
9311
9312         return 0;
9313 }
9314
9315 /* a drop policy has to be deferred until all rules have been activated,
9316  * otherwise a large ruleset that contains a drop-policy base chain will
9317  * cause all packets to get dropped until the full transaction has been
9318  * processed.
9319  *
9320  * We defer the drop policy until the transaction has been finalized.
9321  */
9322 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9323 {
9324         struct nft_base_chain *basechain;
9325
9326         if (nft_trans_chain_policy(trans) != NF_DROP)
9327                 return;
9328
9329         if (!nft_is_base_chain(trans->ctx.chain))
9330                 return;
9331
9332         basechain = nft_base_chain(trans->ctx.chain);
9333         basechain->policy = NF_DROP;
9334 }
9335
9336 static void nft_chain_commit_update(struct nft_trans *trans)
9337 {
9338         struct nft_base_chain *basechain;
9339
9340         if (nft_trans_chain_name(trans)) {
9341                 rhltable_remove(&trans->ctx.table->chains_ht,
9342                                 &trans->ctx.chain->rhlhead,
9343                                 nft_chain_ht_params);
9344                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9345                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9346                                     trans->ctx.chain->name,
9347                                     &trans->ctx.chain->rhlhead,
9348                                     nft_chain_ht_params);
9349         }
9350
9351         if (!nft_is_base_chain(trans->ctx.chain))
9352                 return;
9353
9354         nft_chain_stats_replace(trans);
9355
9356         basechain = nft_base_chain(trans->ctx.chain);
9357
9358         switch (nft_trans_chain_policy(trans)) {
9359         case NF_DROP:
9360         case NF_ACCEPT:
9361                 basechain->policy = nft_trans_chain_policy(trans);
9362                 break;
9363         }
9364 }
9365
9366 static void nft_obj_commit_update(struct nft_trans *trans)
9367 {
9368         struct nft_object *newobj;
9369         struct nft_object *obj;
9370
9371         obj = nft_trans_obj(trans);
9372         newobj = nft_trans_obj_newobj(trans);
9373
9374         if (obj->ops->update)
9375                 obj->ops->update(obj, newobj);
9376
9377         nft_obj_destroy(&trans->ctx, newobj);
9378 }
9379
9380 static void nft_commit_release(struct nft_trans *trans)
9381 {
9382         switch (trans->msg_type) {
9383         case NFT_MSG_DELTABLE:
9384         case NFT_MSG_DESTROYTABLE:
9385                 nf_tables_table_destroy(&trans->ctx);
9386                 break;
9387         case NFT_MSG_NEWCHAIN:
9388                 free_percpu(nft_trans_chain_stats(trans));
9389                 kfree(nft_trans_chain_name(trans));
9390                 break;
9391         case NFT_MSG_DELCHAIN:
9392         case NFT_MSG_DESTROYCHAIN:
9393                 if (nft_trans_chain_update(trans))
9394                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9395                 else
9396                         nf_tables_chain_destroy(&trans->ctx);
9397                 break;
9398         case NFT_MSG_DELRULE:
9399         case NFT_MSG_DESTROYRULE:
9400                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9401                 break;
9402         case NFT_MSG_DELSET:
9403         case NFT_MSG_DESTROYSET:
9404                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9405                 break;
9406         case NFT_MSG_DELSETELEM:
9407         case NFT_MSG_DESTROYSETELEM:
9408                 nf_tables_set_elem_destroy(&trans->ctx,
9409                                            nft_trans_elem_set(trans),
9410                                            nft_trans_elem_priv(trans));
9411                 break;
9412         case NFT_MSG_DELOBJ:
9413         case NFT_MSG_DESTROYOBJ:
9414                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9415                 break;
9416         case NFT_MSG_DELFLOWTABLE:
9417         case NFT_MSG_DESTROYFLOWTABLE:
9418                 if (nft_trans_flowtable_update(trans))
9419                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9420                 else
9421                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9422                 break;
9423         }
9424
9425         if (trans->put_net)
9426                 put_net(trans->ctx.net);
9427
9428         kfree(trans);
9429 }
9430
9431 static void nf_tables_trans_destroy_work(struct work_struct *w)
9432 {
9433         struct nft_trans *trans, *next;
9434         LIST_HEAD(head);
9435
9436         spin_lock(&nf_tables_destroy_list_lock);
9437         list_splice_init(&nf_tables_destroy_list, &head);
9438         spin_unlock(&nf_tables_destroy_list_lock);
9439
9440         if (list_empty(&head))
9441                 return;
9442
9443         synchronize_rcu();
9444
9445         list_for_each_entry_safe(trans, next, &head, list) {
9446                 nft_trans_list_del(trans);
9447                 nft_commit_release(trans);
9448         }
9449 }
9450
9451 void nf_tables_trans_destroy_flush_work(void)
9452 {
9453         flush_work(&trans_destroy_work);
9454 }
9455 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9456
9457 static bool nft_expr_reduce(struct nft_regs_track *track,
9458                             const struct nft_expr *expr)
9459 {
9460         return false;
9461 }
9462
9463 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9464 {
9465         const struct nft_expr *expr, *last;
9466         struct nft_regs_track track = {};
9467         unsigned int size, data_size;
9468         void *data, *data_boundary;
9469         struct nft_rule_dp *prule;
9470         struct nft_rule *rule;
9471
9472         /* already handled or inactive chain? */
9473         if (chain->blob_next || !nft_is_active_next(net, chain))
9474                 return 0;
9475
9476         data_size = 0;
9477         list_for_each_entry(rule, &chain->rules, list) {
9478                 if (nft_is_active_next(net, rule)) {
9479                         data_size += sizeof(*prule) + rule->dlen;
9480                         if (data_size > INT_MAX)
9481                                 return -ENOMEM;
9482                 }
9483         }
9484
9485         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9486         if (!chain->blob_next)
9487                 return -ENOMEM;
9488
9489         data = (void *)chain->blob_next->data;
9490         data_boundary = data + data_size;
9491         size = 0;
9492
9493         list_for_each_entry(rule, &chain->rules, list) {
9494                 if (!nft_is_active_next(net, rule))
9495                         continue;
9496
9497                 prule = (struct nft_rule_dp *)data;
9498                 data += offsetof(struct nft_rule_dp, data);
9499                 if (WARN_ON_ONCE(data > data_boundary))
9500                         return -ENOMEM;
9501
9502                 size = 0;
9503                 track.last = nft_expr_last(rule);
9504                 nft_rule_for_each_expr(expr, last, rule) {
9505                         track.cur = expr;
9506
9507                         if (nft_expr_reduce(&track, expr)) {
9508                                 expr = track.cur;
9509                                 continue;
9510                         }
9511
9512                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9513                                 return -ENOMEM;
9514
9515                         memcpy(data + size, expr, expr->ops->size);
9516                         size += expr->ops->size;
9517                 }
9518                 if (WARN_ON_ONCE(size >= 1 << 12))
9519                         return -ENOMEM;
9520
9521                 prule->handle = rule->handle;
9522                 prule->dlen = size;
9523                 prule->is_last = 0;
9524
9525                 data += size;
9526                 size = 0;
9527                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9528         }
9529
9530         if (WARN_ON_ONCE(data > data_boundary))
9531                 return -ENOMEM;
9532
9533         prule = (struct nft_rule_dp *)data;
9534         nft_last_rule(chain, prule);
9535
9536         return 0;
9537 }
9538
9539 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9540 {
9541         struct nftables_pernet *nft_net = nft_pernet(net);
9542         struct nft_trans *trans, *next;
9543
9544         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9545                 struct nft_chain *chain = trans->ctx.chain;
9546
9547                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9548                     trans->msg_type == NFT_MSG_DELRULE) {
9549                         kvfree(chain->blob_next);
9550                         chain->blob_next = NULL;
9551                 }
9552         }
9553 }
9554
9555 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9556 {
9557         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9558
9559         kvfree(l->blob);
9560 }
9561
9562 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9563 {
9564         struct nft_rule_dp_last *last;
9565
9566         /* last rule trailer is after end marker */
9567         last = (void *)blob + sizeof(*blob) + blob->size;
9568         last->blob = blob;
9569
9570         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9571 }
9572
9573 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9574 {
9575         struct nft_rule_blob *g0, *g1;
9576         bool next_genbit;
9577
9578         next_genbit = nft_gencursor_next(net);
9579
9580         g0 = rcu_dereference_protected(chain->blob_gen_0,
9581                                        lockdep_commit_lock_is_held(net));
9582         g1 = rcu_dereference_protected(chain->blob_gen_1,
9583                                        lockdep_commit_lock_is_held(net));
9584
9585         /* No changes to this chain? */
9586         if (chain->blob_next == NULL) {
9587                 /* chain had no change in last or next generation */
9588                 if (g0 == g1)
9589                         return;
9590                 /*
9591                  * chain had no change in this generation; make sure next
9592                  * one uses same rules as current generation.
9593                  */
9594                 if (next_genbit) {
9595                         rcu_assign_pointer(chain->blob_gen_1, g0);
9596                         nf_tables_commit_chain_free_rules_old(g1);
9597                 } else {
9598                         rcu_assign_pointer(chain->blob_gen_0, g1);
9599                         nf_tables_commit_chain_free_rules_old(g0);
9600                 }
9601
9602                 return;
9603         }
9604
9605         if (next_genbit)
9606                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9607         else
9608                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9609
9610         chain->blob_next = NULL;
9611
9612         if (g0 == g1)
9613                 return;
9614
9615         if (next_genbit)
9616                 nf_tables_commit_chain_free_rules_old(g1);
9617         else
9618                 nf_tables_commit_chain_free_rules_old(g0);
9619 }
9620
9621 static void nft_obj_del(struct nft_object *obj)
9622 {
9623         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9624         list_del_rcu(&obj->list);
9625 }
9626
9627 void nft_chain_del(struct nft_chain *chain)
9628 {
9629         struct nft_table *table = chain->table;
9630
9631         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9632                                      nft_chain_ht_params));
9633         list_del_rcu(&chain->list);
9634 }
9635
9636 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9637                                         struct nft_trans_gc *trans)
9638 {
9639         struct nft_elem_priv **priv = trans->priv;
9640         unsigned int i;
9641
9642         for (i = 0; i < trans->count; i++) {
9643                 nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
9644                 nft_setelem_remove(ctx->net, trans->set, priv[i]);
9645         }
9646 }
9647
9648 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9649 {
9650         nft_set_put(trans->set);
9651         put_net(trans->net);
9652         kfree(trans);
9653 }
9654
9655 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9656 {
9657         struct nft_elem_priv *elem_priv;
9658         struct nft_trans_gc *trans;
9659         struct nft_ctx ctx = {};
9660         unsigned int i;
9661
9662         trans = container_of(rcu, struct nft_trans_gc, rcu);
9663         ctx.net = read_pnet(&trans->set->net);
9664
9665         for (i = 0; i < trans->count; i++) {
9666                 elem_priv = trans->priv[i];
9667                 if (!nft_setelem_is_catchall(trans->set, elem_priv))
9668                         atomic_dec(&trans->set->nelems);
9669
9670                 nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
9671         }
9672
9673         nft_trans_gc_destroy(trans);
9674 }
9675
9676 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9677 {
9678         struct nftables_pernet *nft_net;
9679         struct nft_ctx ctx = {};
9680
9681         nft_net = nft_pernet(trans->net);
9682
9683         mutex_lock(&nft_net->commit_mutex);
9684
9685         /* Check for race with transaction, otherwise this batch refers to
9686          * stale objects that might not be there anymore. Skip transaction if
9687          * set has been destroyed from control plane transaction in case gc
9688          * worker loses race.
9689          */
9690         if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9691                 mutex_unlock(&nft_net->commit_mutex);
9692                 return false;
9693         }
9694
9695         ctx.net = trans->net;
9696         ctx.table = trans->set->table;
9697
9698         nft_trans_gc_setelem_remove(&ctx, trans);
9699         mutex_unlock(&nft_net->commit_mutex);
9700
9701         return true;
9702 }
9703
9704 static void nft_trans_gc_work(struct work_struct *work)
9705 {
9706         struct nft_trans_gc *trans, *next;
9707         LIST_HEAD(trans_gc_list);
9708
9709         spin_lock(&nf_tables_gc_list_lock);
9710         list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9711         spin_unlock(&nf_tables_gc_list_lock);
9712
9713         list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9714                 list_del(&trans->list);
9715                 if (!nft_trans_gc_work_done(trans)) {
9716                         nft_trans_gc_destroy(trans);
9717                         continue;
9718                 }
9719                 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9720         }
9721 }
9722
9723 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9724                                         unsigned int gc_seq, gfp_t gfp)
9725 {
9726         struct net *net = read_pnet(&set->net);
9727         struct nft_trans_gc *trans;
9728
9729         trans = kzalloc(sizeof(*trans), gfp);
9730         if (!trans)
9731                 return NULL;
9732
9733         trans->net = maybe_get_net(net);
9734         if (!trans->net) {
9735                 kfree(trans);
9736                 return NULL;
9737         }
9738
9739         refcount_inc(&set->refs);
9740         trans->set = set;
9741         trans->seq = gc_seq;
9742
9743         return trans;
9744 }
9745
9746 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9747 {
9748         trans->priv[trans->count++] = priv;
9749 }
9750
9751 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9752 {
9753         spin_lock(&nf_tables_gc_list_lock);
9754         list_add_tail(&trans->list, &nf_tables_gc_list);
9755         spin_unlock(&nf_tables_gc_list_lock);
9756
9757         schedule_work(&trans_gc_work);
9758 }
9759
9760 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9761 {
9762         return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9763 }
9764
9765 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9766                                               unsigned int gc_seq, gfp_t gfp)
9767 {
9768         struct nft_set *set;
9769
9770         if (nft_trans_gc_space(gc))
9771                 return gc;
9772
9773         set = gc->set;
9774         nft_trans_gc_queue_work(gc);
9775
9776         return nft_trans_gc_alloc(set, gc_seq, gfp);
9777 }
9778
9779 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9780 {
9781         if (trans->count == 0) {
9782                 nft_trans_gc_destroy(trans);
9783                 return;
9784         }
9785
9786         nft_trans_gc_queue_work(trans);
9787 }
9788
9789 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9790 {
9791         struct nft_set *set;
9792
9793         if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9794                 return NULL;
9795
9796         if (nft_trans_gc_space(gc))
9797                 return gc;
9798
9799         set = gc->set;
9800         call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9801
9802         return nft_trans_gc_alloc(set, 0, gfp);
9803 }
9804
9805 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9806 {
9807         WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9808
9809         if (trans->count == 0) {
9810                 nft_trans_gc_destroy(trans);
9811                 return;
9812         }
9813
9814         call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9815 }
9816
9817 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9818                                                  unsigned int gc_seq)
9819 {
9820         struct nft_set_elem_catchall *catchall;
9821         const struct nft_set *set = gc->set;
9822         struct nft_set_ext *ext;
9823
9824         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9825                 ext = nft_set_elem_ext(set, catchall->elem);
9826
9827                 if (!nft_set_elem_expired(ext))
9828                         continue;
9829                 if (nft_set_elem_is_dead(ext))
9830                         goto dead_elem;
9831
9832                 nft_set_elem_dead(ext);
9833 dead_elem:
9834                 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9835                 if (!gc)
9836                         return NULL;
9837
9838                 nft_trans_gc_elem_add(gc, catchall->elem);
9839         }
9840
9841         return gc;
9842 }
9843
9844 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9845 {
9846         struct nft_set_elem_catchall *catchall, *next;
9847         u64 tstamp = nft_net_tstamp(gc->net);
9848         const struct nft_set *set = gc->set;
9849         struct nft_elem_priv *elem_priv;
9850         struct nft_set_ext *ext;
9851
9852         WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9853
9854         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9855                 ext = nft_set_elem_ext(set, catchall->elem);
9856
9857                 if (!__nft_set_elem_expired(ext, tstamp))
9858                         continue;
9859
9860                 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9861                 if (!gc)
9862                         return NULL;
9863
9864                 elem_priv = catchall->elem;
9865                 nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
9866                 nft_setelem_catchall_destroy(catchall);
9867                 nft_trans_gc_elem_add(gc, elem_priv);
9868         }
9869
9870         return gc;
9871 }
9872
9873 static void nf_tables_module_autoload_cleanup(struct net *net)
9874 {
9875         struct nftables_pernet *nft_net = nft_pernet(net);
9876         struct nft_module_request *req, *next;
9877
9878         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9879         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9880                 WARN_ON_ONCE(!req->done);
9881                 list_del(&req->list);
9882                 kfree(req);
9883         }
9884 }
9885
9886 static void nf_tables_commit_release(struct net *net)
9887 {
9888         struct nftables_pernet *nft_net = nft_pernet(net);
9889         struct nft_trans *trans;
9890
9891         /* all side effects have to be made visible.
9892          * For example, if a chain named 'foo' has been deleted, a
9893          * new transaction must not find it anymore.
9894          *
9895          * Memory reclaim happens asynchronously from work queue
9896          * to prevent expensive synchronize_rcu() in commit phase.
9897          */
9898         if (list_empty(&nft_net->commit_list)) {
9899                 nf_tables_module_autoload_cleanup(net);
9900                 mutex_unlock(&nft_net->commit_mutex);
9901                 return;
9902         }
9903
9904         trans = list_last_entry(&nft_net->commit_list,
9905                                 struct nft_trans, list);
9906         get_net(trans->ctx.net);
9907         WARN_ON_ONCE(trans->put_net);
9908
9909         trans->put_net = true;
9910         spin_lock(&nf_tables_destroy_list_lock);
9911         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9912         spin_unlock(&nf_tables_destroy_list_lock);
9913
9914         nf_tables_module_autoload_cleanup(net);
9915         schedule_work(&trans_destroy_work);
9916
9917         mutex_unlock(&nft_net->commit_mutex);
9918 }
9919
9920 static void nft_commit_notify(struct net *net, u32 portid)
9921 {
9922         struct nftables_pernet *nft_net = nft_pernet(net);
9923         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9924         unsigned char *data;
9925         int len;
9926
9927         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9928                 if (!batch_skb) {
9929 new_batch:
9930                         batch_skb = skb;
9931                         len = NLMSG_GOODSIZE - skb->len;
9932                         list_del(&skb->list);
9933                         continue;
9934                 }
9935                 len -= skb->len;
9936                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9937                         data = skb_put(batch_skb, skb->len);
9938                         memcpy(data, skb->data, skb->len);
9939                         list_del(&skb->list);
9940                         kfree_skb(skb);
9941                         continue;
9942                 }
9943                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9944                                NFT_CB(batch_skb).report, GFP_KERNEL);
9945                 goto new_batch;
9946         }
9947
9948         if (batch_skb) {
9949                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9950                                NFT_CB(batch_skb).report, GFP_KERNEL);
9951         }
9952
9953         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9954 }
9955
9956 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9957                                         struct nft_table *table)
9958 {
9959         struct nft_audit_data *adp;
9960
9961         list_for_each_entry(adp, adl, list) {
9962                 if (adp->table == table)
9963                         return 0;
9964         }
9965         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9966         if (!adp)
9967                 return -ENOMEM;
9968         adp->table = table;
9969         list_add(&adp->list, adl);
9970         return 0;
9971 }
9972
9973 static void nf_tables_commit_audit_free(struct list_head *adl)
9974 {
9975         struct nft_audit_data *adp, *adn;
9976
9977         list_for_each_entry_safe(adp, adn, adl, list) {
9978                 list_del(&adp->list);
9979                 kfree(adp);
9980         }
9981 }
9982
9983 static void nf_tables_commit_audit_collect(struct list_head *adl,
9984                                            struct nft_table *table, u32 op)
9985 {
9986         struct nft_audit_data *adp;
9987
9988         list_for_each_entry(adp, adl, list) {
9989                 if (adp->table == table)
9990                         goto found;
9991         }
9992         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9993         return;
9994 found:
9995         adp->entries++;
9996         if (!adp->op || adp->op > op)
9997                 adp->op = op;
9998 }
9999
10000 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
10001
10002 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
10003 {
10004         struct nft_audit_data *adp, *adn;
10005         char aubuf[AUNFTABLENAMELEN];
10006
10007         list_for_each_entry_safe(adp, adn, adl, list) {
10008                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
10009                          generation);
10010                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
10011                                 nft2audit_op[adp->op], GFP_KERNEL);
10012                 list_del(&adp->list);
10013                 kfree(adp);
10014         }
10015 }
10016
10017 static void nft_set_commit_update(struct list_head *set_update_list)
10018 {
10019         struct nft_set *set, *next;
10020
10021         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10022                 list_del_init(&set->pending_update);
10023
10024                 if (!set->ops->commit || set->dead)
10025                         continue;
10026
10027                 set->ops->commit(set);
10028         }
10029 }
10030
10031 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10032 {
10033         unsigned int gc_seq;
10034
10035         /* Bump gc counter, it becomes odd, this is the busy mark. */
10036         gc_seq = READ_ONCE(nft_net->gc_seq);
10037         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10038
10039         return gc_seq;
10040 }
10041
10042 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10043 {
10044         WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10045 }
10046
10047 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10048 {
10049         struct nftables_pernet *nft_net = nft_pernet(net);
10050         struct nft_trans *trans, *next;
10051         unsigned int base_seq, gc_seq;
10052         LIST_HEAD(set_update_list);
10053         struct nft_trans_elem *te;
10054         struct nft_chain *chain;
10055         struct nft_table *table;
10056         LIST_HEAD(adl);
10057         int err;
10058
10059         if (list_empty(&nft_net->commit_list)) {
10060                 mutex_unlock(&nft_net->commit_mutex);
10061                 return 0;
10062         }
10063
10064         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10065                 switch (trans->msg_type) {
10066                 case NFT_MSG_NEWSET:
10067                         if (!nft_trans_set_update(trans) &&
10068                             nft_set_is_anonymous(nft_trans_set(trans)) &&
10069                             !nft_trans_set_bound(trans)) {
10070                                 pr_warn_once("nftables ruleset with unbound set\n");
10071                                 return -EINVAL;
10072                         }
10073                         break;
10074                 case NFT_MSG_NEWCHAIN:
10075                         if (!nft_trans_chain_update(trans) &&
10076                             nft_chain_binding(nft_trans_chain(trans)) &&
10077                             !nft_trans_chain_bound(trans)) {
10078                                 pr_warn_once("nftables ruleset with unbound chain\n");
10079                                 return -EINVAL;
10080                         }
10081                         break;
10082                 }
10083         }
10084
10085         /* 0. Validate ruleset, otherwise roll back for error reporting. */
10086         if (nf_tables_validate(net) < 0) {
10087                 nft_net->validate_state = NFT_VALIDATE_DO;
10088                 return -EAGAIN;
10089         }
10090
10091         err = nft_flow_rule_offload_commit(net);
10092         if (err < 0)
10093                 return err;
10094
10095         /* 1.  Allocate space for next generation rules_gen_X[] */
10096         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10097                 int ret;
10098
10099                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10100                 if (ret) {
10101                         nf_tables_commit_chain_prepare_cancel(net);
10102                         nf_tables_commit_audit_free(&adl);
10103                         return ret;
10104                 }
10105                 if (trans->msg_type == NFT_MSG_NEWRULE ||
10106                     trans->msg_type == NFT_MSG_DELRULE) {
10107                         chain = trans->ctx.chain;
10108
10109                         ret = nf_tables_commit_chain_prepare(net, chain);
10110                         if (ret < 0) {
10111                                 nf_tables_commit_chain_prepare_cancel(net);
10112                                 nf_tables_commit_audit_free(&adl);
10113                                 return ret;
10114                         }
10115                 }
10116         }
10117
10118         /* step 2.  Make rules_gen_X visible to packet path */
10119         list_for_each_entry(table, &nft_net->tables, list) {
10120                 list_for_each_entry(chain, &table->chains, list)
10121                         nf_tables_commit_chain(net, chain);
10122         }
10123
10124         /*
10125          * Bump generation counter, invalidate any dump in progress.
10126          * Cannot fail after this point.
10127          */
10128         base_seq = READ_ONCE(nft_net->base_seq);
10129         while (++base_seq == 0)
10130                 ;
10131
10132         WRITE_ONCE(nft_net->base_seq, base_seq);
10133
10134         gc_seq = nft_gc_seq_begin(nft_net);
10135
10136         /* step 3. Start new generation, rules_gen_X now in use. */
10137         net->nft.gencursor = nft_gencursor_next(net);
10138
10139         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10140                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10141                                                trans->msg_type);
10142                 switch (trans->msg_type) {
10143                 case NFT_MSG_NEWTABLE:
10144                         if (nft_trans_table_update(trans)) {
10145                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10146                                         nft_trans_destroy(trans);
10147                                         break;
10148                                 }
10149                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10150                                         nf_tables_table_disable(net, trans->ctx.table);
10151
10152                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10153                         } else {
10154                                 nft_clear(net, trans->ctx.table);
10155                         }
10156                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10157                         nft_trans_destroy(trans);
10158                         break;
10159                 case NFT_MSG_DELTABLE:
10160                 case NFT_MSG_DESTROYTABLE:
10161                         list_del_rcu(&trans->ctx.table->list);
10162                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
10163                         break;
10164                 case NFT_MSG_NEWCHAIN:
10165                         if (nft_trans_chain_update(trans)) {
10166                                 nft_chain_commit_update(trans);
10167                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10168                                                        &nft_trans_chain_hooks(trans));
10169                                 list_splice(&nft_trans_chain_hooks(trans),
10170                                             &nft_trans_basechain(trans)->hook_list);
10171                                 /* trans destroyed after rcu grace period */
10172                         } else {
10173                                 nft_chain_commit_drop_policy(trans);
10174                                 nft_clear(net, trans->ctx.chain);
10175                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10176                                 nft_trans_destroy(trans);
10177                         }
10178                         break;
10179                 case NFT_MSG_DELCHAIN:
10180                 case NFT_MSG_DESTROYCHAIN:
10181                         if (nft_trans_chain_update(trans)) {
10182                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10183                                                        &nft_trans_chain_hooks(trans));
10184                                 nft_netdev_unregister_hooks(net,
10185                                                             &nft_trans_chain_hooks(trans),
10186                                                             true);
10187                         } else {
10188                                 nft_chain_del(trans->ctx.chain);
10189                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10190                                                        NULL);
10191                                 nf_tables_unregister_hook(trans->ctx.net,
10192                                                           trans->ctx.table,
10193                                                           trans->ctx.chain);
10194                         }
10195                         break;
10196                 case NFT_MSG_NEWRULE:
10197                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10198                         nf_tables_rule_notify(&trans->ctx,
10199                                               nft_trans_rule(trans),
10200                                               NFT_MSG_NEWRULE);
10201                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10202                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10203
10204                         nft_trans_destroy(trans);
10205                         break;
10206                 case NFT_MSG_DELRULE:
10207                 case NFT_MSG_DESTROYRULE:
10208                         list_del_rcu(&nft_trans_rule(trans)->list);
10209                         nf_tables_rule_notify(&trans->ctx,
10210                                               nft_trans_rule(trans),
10211                                               trans->msg_type);
10212                         nft_rule_expr_deactivate(&trans->ctx,
10213                                                  nft_trans_rule(trans),
10214                                                  NFT_TRANS_COMMIT);
10215
10216                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10217                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10218                         break;
10219                 case NFT_MSG_NEWSET:
10220                         if (nft_trans_set_update(trans)) {
10221                                 struct nft_set *set = nft_trans_set(trans);
10222
10223                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10224                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10225
10226                                 if (nft_trans_set_size(trans))
10227                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
10228                         } else {
10229                                 nft_clear(net, nft_trans_set(trans));
10230                                 /* This avoids hitting -EBUSY when deleting the table
10231                                  * from the transaction.
10232                                  */
10233                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10234                                     !list_empty(&nft_trans_set(trans)->bindings))
10235                                         nft_use_dec(&trans->ctx.table->use);
10236                         }
10237                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10238                                              NFT_MSG_NEWSET, GFP_KERNEL);
10239                         nft_trans_destroy(trans);
10240                         break;
10241                 case NFT_MSG_DELSET:
10242                 case NFT_MSG_DESTROYSET:
10243                         nft_trans_set(trans)->dead = 1;
10244                         list_del_rcu(&nft_trans_set(trans)->list);
10245                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10246                                              trans->msg_type, GFP_KERNEL);
10247                         break;
10248                 case NFT_MSG_NEWSETELEM:
10249                         te = (struct nft_trans_elem *)trans->data;
10250
10251                         nft_setelem_activate(net, te->set, te->elem_priv);
10252                         nf_tables_setelem_notify(&trans->ctx, te->set,
10253                                                  te->elem_priv,
10254                                                  NFT_MSG_NEWSETELEM);
10255                         if (te->set->ops->commit &&
10256                             list_empty(&te->set->pending_update)) {
10257                                 list_add_tail(&te->set->pending_update,
10258                                               &set_update_list);
10259                         }
10260                         nft_trans_destroy(trans);
10261                         break;
10262                 case NFT_MSG_DELSETELEM:
10263                 case NFT_MSG_DESTROYSETELEM:
10264                         te = (struct nft_trans_elem *)trans->data;
10265
10266                         nf_tables_setelem_notify(&trans->ctx, te->set,
10267                                                  te->elem_priv,
10268                                                  trans->msg_type);
10269                         nft_setelem_remove(net, te->set, te->elem_priv);
10270                         if (!nft_setelem_is_catchall(te->set, te->elem_priv)) {
10271                                 atomic_dec(&te->set->nelems);
10272                                 te->set->ndeact--;
10273                         }
10274                         if (te->set->ops->commit &&
10275                             list_empty(&te->set->pending_update)) {
10276                                 list_add_tail(&te->set->pending_update,
10277                                               &set_update_list);
10278                         }
10279                         break;
10280                 case NFT_MSG_NEWOBJ:
10281                         if (nft_trans_obj_update(trans)) {
10282                                 nft_obj_commit_update(trans);
10283                                 nf_tables_obj_notify(&trans->ctx,
10284                                                      nft_trans_obj(trans),
10285                                                      NFT_MSG_NEWOBJ);
10286                         } else {
10287                                 nft_clear(net, nft_trans_obj(trans));
10288                                 nf_tables_obj_notify(&trans->ctx,
10289                                                      nft_trans_obj(trans),
10290                                                      NFT_MSG_NEWOBJ);
10291                                 nft_trans_destroy(trans);
10292                         }
10293                         break;
10294                 case NFT_MSG_DELOBJ:
10295                 case NFT_MSG_DESTROYOBJ:
10296                         nft_obj_del(nft_trans_obj(trans));
10297                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10298                                              trans->msg_type);
10299                         break;
10300                 case NFT_MSG_NEWFLOWTABLE:
10301                         if (nft_trans_flowtable_update(trans)) {
10302                                 nft_trans_flowtable(trans)->data.flags =
10303                                         nft_trans_flowtable_flags(trans);
10304                                 nf_tables_flowtable_notify(&trans->ctx,
10305                                                            nft_trans_flowtable(trans),
10306                                                            &nft_trans_flowtable_hooks(trans),
10307                                                            NFT_MSG_NEWFLOWTABLE);
10308                                 list_splice(&nft_trans_flowtable_hooks(trans),
10309                                             &nft_trans_flowtable(trans)->hook_list);
10310                         } else {
10311                                 nft_clear(net, nft_trans_flowtable(trans));
10312                                 nf_tables_flowtable_notify(&trans->ctx,
10313                                                            nft_trans_flowtable(trans),
10314                                                            NULL,
10315                                                            NFT_MSG_NEWFLOWTABLE);
10316                         }
10317                         nft_trans_destroy(trans);
10318                         break;
10319                 case NFT_MSG_DELFLOWTABLE:
10320                 case NFT_MSG_DESTROYFLOWTABLE:
10321                         if (nft_trans_flowtable_update(trans)) {
10322                                 nf_tables_flowtable_notify(&trans->ctx,
10323                                                            nft_trans_flowtable(trans),
10324                                                            &nft_trans_flowtable_hooks(trans),
10325                                                            trans->msg_type);
10326                                 nft_unregister_flowtable_net_hooks(net,
10327                                                                    &nft_trans_flowtable_hooks(trans));
10328                         } else {
10329                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10330                                 nf_tables_flowtable_notify(&trans->ctx,
10331                                                            nft_trans_flowtable(trans),
10332                                                            NULL,
10333                                                            trans->msg_type);
10334                                 nft_unregister_flowtable_net_hooks(net,
10335                                                 &nft_trans_flowtable(trans)->hook_list);
10336                         }
10337                         break;
10338                 }
10339         }
10340
10341         nft_set_commit_update(&set_update_list);
10342
10343         nft_commit_notify(net, NETLINK_CB(skb).portid);
10344         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10345         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10346
10347         nft_gc_seq_end(nft_net, gc_seq);
10348         nft_net->validate_state = NFT_VALIDATE_SKIP;
10349         nf_tables_commit_release(net);
10350
10351         return 0;
10352 }
10353
10354 static void nf_tables_module_autoload(struct net *net)
10355 {
10356         struct nftables_pernet *nft_net = nft_pernet(net);
10357         struct nft_module_request *req, *next;
10358         LIST_HEAD(module_list);
10359
10360         list_splice_init(&nft_net->module_list, &module_list);
10361         mutex_unlock(&nft_net->commit_mutex);
10362         list_for_each_entry_safe(req, next, &module_list, list) {
10363                 request_module("%s", req->module);
10364                 req->done = true;
10365         }
10366         mutex_lock(&nft_net->commit_mutex);
10367         list_splice(&module_list, &nft_net->module_list);
10368 }
10369
10370 static void nf_tables_abort_release(struct nft_trans *trans)
10371 {
10372         switch (trans->msg_type) {
10373         case NFT_MSG_NEWTABLE:
10374                 nf_tables_table_destroy(&trans->ctx);
10375                 break;
10376         case NFT_MSG_NEWCHAIN:
10377                 if (nft_trans_chain_update(trans))
10378                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10379                 else
10380                         nf_tables_chain_destroy(&trans->ctx);
10381                 break;
10382         case NFT_MSG_NEWRULE:
10383                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10384                 break;
10385         case NFT_MSG_NEWSET:
10386                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10387                 break;
10388         case NFT_MSG_NEWSETELEM:
10389                 nft_set_elem_destroy(nft_trans_elem_set(trans),
10390                                      nft_trans_elem_priv(trans), true);
10391                 break;
10392         case NFT_MSG_NEWOBJ:
10393                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10394                 break;
10395         case NFT_MSG_NEWFLOWTABLE:
10396                 if (nft_trans_flowtable_update(trans))
10397                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10398                 else
10399                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10400                 break;
10401         }
10402         kfree(trans);
10403 }
10404
10405 static void nft_set_abort_update(struct list_head *set_update_list)
10406 {
10407         struct nft_set *set, *next;
10408
10409         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10410                 list_del_init(&set->pending_update);
10411
10412                 if (!set->ops->abort)
10413                         continue;
10414
10415                 set->ops->abort(set);
10416         }
10417 }
10418
10419 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10420 {
10421         struct nftables_pernet *nft_net = nft_pernet(net);
10422         struct nft_trans *trans, *next;
10423         LIST_HEAD(set_update_list);
10424         struct nft_trans_elem *te;
10425
10426         if (action == NFNL_ABORT_VALIDATE &&
10427             nf_tables_validate(net) < 0)
10428                 return -EAGAIN;
10429
10430         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10431                                          list) {
10432                 switch (trans->msg_type) {
10433                 case NFT_MSG_NEWTABLE:
10434                         if (nft_trans_table_update(trans)) {
10435                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10436                                         nft_trans_destroy(trans);
10437                                         break;
10438                                 }
10439                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10440                                         nf_tables_table_disable(net, trans->ctx.table);
10441                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10442                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10443                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10444                                 }
10445                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_ORPHAN) {
10446                                         trans->ctx.table->flags &= ~NFT_TABLE_F_OWNER;
10447                                         trans->ctx.table->nlpid = 0;
10448                                 }
10449                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10450                                 nft_trans_destroy(trans);
10451                         } else {
10452                                 list_del_rcu(&trans->ctx.table->list);
10453                         }
10454                         break;
10455                 case NFT_MSG_DELTABLE:
10456                 case NFT_MSG_DESTROYTABLE:
10457                         nft_clear(trans->ctx.net, trans->ctx.table);
10458                         nft_trans_destroy(trans);
10459                         break;
10460                 case NFT_MSG_NEWCHAIN:
10461                         if (nft_trans_chain_update(trans)) {
10462                                 nft_netdev_unregister_hooks(net,
10463                                                             &nft_trans_chain_hooks(trans),
10464                                                             true);
10465                                 free_percpu(nft_trans_chain_stats(trans));
10466                                 kfree(nft_trans_chain_name(trans));
10467                                 nft_trans_destroy(trans);
10468                         } else {
10469                                 if (nft_trans_chain_bound(trans)) {
10470                                         nft_trans_destroy(trans);
10471                                         break;
10472                                 }
10473                                 nft_use_dec_restore(&trans->ctx.table->use);
10474                                 nft_chain_del(trans->ctx.chain);
10475                                 nf_tables_unregister_hook(trans->ctx.net,
10476                                                           trans->ctx.table,
10477                                                           trans->ctx.chain);
10478                         }
10479                         break;
10480                 case NFT_MSG_DELCHAIN:
10481                 case NFT_MSG_DESTROYCHAIN:
10482                         if (nft_trans_chain_update(trans)) {
10483                                 list_splice(&nft_trans_chain_hooks(trans),
10484                                             &nft_trans_basechain(trans)->hook_list);
10485                         } else {
10486                                 nft_use_inc_restore(&trans->ctx.table->use);
10487                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10488                         }
10489                         nft_trans_destroy(trans);
10490                         break;
10491                 case NFT_MSG_NEWRULE:
10492                         if (nft_trans_rule_bound(trans)) {
10493                                 nft_trans_destroy(trans);
10494                                 break;
10495                         }
10496                         nft_use_dec_restore(&trans->ctx.chain->use);
10497                         list_del_rcu(&nft_trans_rule(trans)->list);
10498                         nft_rule_expr_deactivate(&trans->ctx,
10499                                                  nft_trans_rule(trans),
10500                                                  NFT_TRANS_ABORT);
10501                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10502                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10503                         break;
10504                 case NFT_MSG_DELRULE:
10505                 case NFT_MSG_DESTROYRULE:
10506                         nft_use_inc_restore(&trans->ctx.chain->use);
10507                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10508                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10509                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10510                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10511
10512                         nft_trans_destroy(trans);
10513                         break;
10514                 case NFT_MSG_NEWSET:
10515                         if (nft_trans_set_update(trans)) {
10516                                 nft_trans_destroy(trans);
10517                                 break;
10518                         }
10519                         nft_use_dec_restore(&trans->ctx.table->use);
10520                         if (nft_trans_set_bound(trans)) {
10521                                 nft_trans_destroy(trans);
10522                                 break;
10523                         }
10524                         nft_trans_set(trans)->dead = 1;
10525                         list_del_rcu(&nft_trans_set(trans)->list);
10526                         break;
10527                 case NFT_MSG_DELSET:
10528                 case NFT_MSG_DESTROYSET:
10529                         nft_use_inc_restore(&trans->ctx.table->use);
10530                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10531                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10532                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10533
10534                         nft_trans_destroy(trans);
10535                         break;
10536                 case NFT_MSG_NEWSETELEM:
10537                         if (nft_trans_elem_set_bound(trans)) {
10538                                 nft_trans_destroy(trans);
10539                                 break;
10540                         }
10541                         te = (struct nft_trans_elem *)trans->data;
10542                         nft_setelem_remove(net, te->set, te->elem_priv);
10543                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10544                                 atomic_dec(&te->set->nelems);
10545
10546                         if (te->set->ops->abort &&
10547                             list_empty(&te->set->pending_update)) {
10548                                 list_add_tail(&te->set->pending_update,
10549                                               &set_update_list);
10550                         }
10551                         break;
10552                 case NFT_MSG_DELSETELEM:
10553                 case NFT_MSG_DESTROYSETELEM:
10554                         te = (struct nft_trans_elem *)trans->data;
10555
10556                         nft_setelem_data_activate(net, te->set, te->elem_priv);
10557                         nft_setelem_activate(net, te->set, te->elem_priv);
10558                         if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10559                                 te->set->ndeact--;
10560
10561                         if (te->set->ops->abort &&
10562                             list_empty(&te->set->pending_update)) {
10563                                 list_add_tail(&te->set->pending_update,
10564                                               &set_update_list);
10565                         }
10566                         nft_trans_destroy(trans);
10567                         break;
10568                 case NFT_MSG_NEWOBJ:
10569                         if (nft_trans_obj_update(trans)) {
10570                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10571                                 nft_trans_destroy(trans);
10572                         } else {
10573                                 nft_use_dec_restore(&trans->ctx.table->use);
10574                                 nft_obj_del(nft_trans_obj(trans));
10575                         }
10576                         break;
10577                 case NFT_MSG_DELOBJ:
10578                 case NFT_MSG_DESTROYOBJ:
10579                         nft_use_inc_restore(&trans->ctx.table->use);
10580                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10581                         nft_trans_destroy(trans);
10582                         break;
10583                 case NFT_MSG_NEWFLOWTABLE:
10584                         if (nft_trans_flowtable_update(trans)) {
10585                                 nft_unregister_flowtable_net_hooks(net,
10586                                                 &nft_trans_flowtable_hooks(trans));
10587                         } else {
10588                                 nft_use_dec_restore(&trans->ctx.table->use);
10589                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10590                                 nft_unregister_flowtable_net_hooks(net,
10591                                                 &nft_trans_flowtable(trans)->hook_list);
10592                         }
10593                         break;
10594                 case NFT_MSG_DELFLOWTABLE:
10595                 case NFT_MSG_DESTROYFLOWTABLE:
10596                         if (nft_trans_flowtable_update(trans)) {
10597                                 list_splice(&nft_trans_flowtable_hooks(trans),
10598                                             &nft_trans_flowtable(trans)->hook_list);
10599                         } else {
10600                                 nft_use_inc_restore(&trans->ctx.table->use);
10601                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10602                         }
10603                         nft_trans_destroy(trans);
10604                         break;
10605                 }
10606         }
10607
10608         nft_set_abort_update(&set_update_list);
10609
10610         synchronize_rcu();
10611
10612         list_for_each_entry_safe_reverse(trans, next,
10613                                          &nft_net->commit_list, list) {
10614                 nft_trans_list_del(trans);
10615                 nf_tables_abort_release(trans);
10616         }
10617
10618         if (action == NFNL_ABORT_AUTOLOAD)
10619                 nf_tables_module_autoload(net);
10620         else
10621                 nf_tables_module_autoload_cleanup(net);
10622
10623         return 0;
10624 }
10625
10626 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10627                            enum nfnl_abort_action action)
10628 {
10629         struct nftables_pernet *nft_net = nft_pernet(net);
10630         unsigned int gc_seq;
10631         int ret;
10632
10633         gc_seq = nft_gc_seq_begin(nft_net);
10634         ret = __nf_tables_abort(net, action);
10635         nft_gc_seq_end(nft_net, gc_seq);
10636         mutex_unlock(&nft_net->commit_mutex);
10637
10638         return ret;
10639 }
10640
10641 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10642 {
10643         struct nftables_pernet *nft_net = nft_pernet(net);
10644         bool genid_ok;
10645
10646         mutex_lock(&nft_net->commit_mutex);
10647         nft_net->tstamp = get_jiffies_64();
10648
10649         genid_ok = genid == 0 || nft_net->base_seq == genid;
10650         if (!genid_ok)
10651                 mutex_unlock(&nft_net->commit_mutex);
10652
10653         /* else, commit mutex has to be released by commit or abort function */
10654         return genid_ok;
10655 }
10656
10657 static const struct nfnetlink_subsystem nf_tables_subsys = {
10658         .name           = "nf_tables",
10659         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10660         .cb_count       = NFT_MSG_MAX,
10661         .cb             = nf_tables_cb,
10662         .commit         = nf_tables_commit,
10663         .abort          = nf_tables_abort,
10664         .valid_genid    = nf_tables_valid_genid,
10665         .owner          = THIS_MODULE,
10666 };
10667
10668 int nft_chain_validate_dependency(const struct nft_chain *chain,
10669                                   enum nft_chain_types type)
10670 {
10671         const struct nft_base_chain *basechain;
10672
10673         if (nft_is_base_chain(chain)) {
10674                 basechain = nft_base_chain(chain);
10675                 if (basechain->type->type != type)
10676                         return -EOPNOTSUPP;
10677         }
10678         return 0;
10679 }
10680 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10681
10682 int nft_chain_validate_hooks(const struct nft_chain *chain,
10683                              unsigned int hook_flags)
10684 {
10685         struct nft_base_chain *basechain;
10686
10687         if (nft_is_base_chain(chain)) {
10688                 basechain = nft_base_chain(chain);
10689
10690                 if ((1 << basechain->ops.hooknum) & hook_flags)
10691                         return 0;
10692
10693                 return -EOPNOTSUPP;
10694         }
10695
10696         return 0;
10697 }
10698 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10699
10700 /*
10701  * Loop detection - walk through the ruleset beginning at the destination chain
10702  * of a new jump until either the source chain is reached (loop) or all
10703  * reachable chains have been traversed.
10704  *
10705  * The loop check is performed whenever a new jump verdict is added to an
10706  * expression or verdict map or a verdict map is bound to a new chain.
10707  */
10708
10709 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10710                                  const struct nft_chain *chain);
10711
10712 static int nft_check_loops(const struct nft_ctx *ctx,
10713                            const struct nft_set_ext *ext)
10714 {
10715         const struct nft_data *data;
10716         int ret;
10717
10718         data = nft_set_ext_data(ext);
10719         switch (data->verdict.code) {
10720         case NFT_JUMP:
10721         case NFT_GOTO:
10722                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10723                 break;
10724         default:
10725                 ret = 0;
10726                 break;
10727         }
10728
10729         return ret;
10730 }
10731
10732 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10733                                         struct nft_set *set,
10734                                         const struct nft_set_iter *iter,
10735                                         struct nft_elem_priv *elem_priv)
10736 {
10737         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
10738
10739         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10740             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10741                 return 0;
10742
10743         return nft_check_loops(ctx, ext);
10744 }
10745
10746 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10747                                   struct nft_set *set)
10748 {
10749         u8 genmask = nft_genmask_next(ctx->net);
10750         struct nft_set_elem_catchall *catchall;
10751         struct nft_set_ext *ext;
10752         int ret = 0;
10753
10754         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10755                 ext = nft_set_elem_ext(set, catchall->elem);
10756                 if (!nft_set_elem_active(ext, genmask))
10757                         continue;
10758
10759                 ret = nft_check_loops(ctx, ext);
10760                 if (ret < 0)
10761                         return ret;
10762         }
10763
10764         return ret;
10765 }
10766
10767 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10768                                  const struct nft_chain *chain)
10769 {
10770         const struct nft_rule *rule;
10771         const struct nft_expr *expr, *last;
10772         struct nft_set *set;
10773         struct nft_set_binding *binding;
10774         struct nft_set_iter iter;
10775
10776         if (ctx->chain == chain)
10777                 return -ELOOP;
10778
10779         if (fatal_signal_pending(current))
10780                 return -EINTR;
10781
10782         list_for_each_entry(rule, &chain->rules, list) {
10783                 nft_rule_for_each_expr(expr, last, rule) {
10784                         struct nft_immediate_expr *priv;
10785                         const struct nft_data *data;
10786                         int err;
10787
10788                         if (strcmp(expr->ops->type->name, "immediate"))
10789                                 continue;
10790
10791                         priv = nft_expr_priv(expr);
10792                         if (priv->dreg != NFT_REG_VERDICT)
10793                                 continue;
10794
10795                         data = &priv->data;
10796                         switch (data->verdict.code) {
10797                         case NFT_JUMP:
10798                         case NFT_GOTO:
10799                                 err = nf_tables_check_loops(ctx,
10800                                                         data->verdict.chain);
10801                                 if (err < 0)
10802                                         return err;
10803                                 break;
10804                         default:
10805                                 break;
10806                         }
10807                 }
10808         }
10809
10810         list_for_each_entry(set, &ctx->table->sets, list) {
10811                 if (!nft_is_active_next(ctx->net, set))
10812                         continue;
10813                 if (!(set->flags & NFT_SET_MAP) ||
10814                     set->dtype != NFT_DATA_VERDICT)
10815                         continue;
10816
10817                 list_for_each_entry(binding, &set->bindings, list) {
10818                         if (!(binding->flags & NFT_SET_MAP) ||
10819                             binding->chain != chain)
10820                                 continue;
10821
10822                         iter.genmask    = nft_genmask_next(ctx->net);
10823                         iter.skip       = 0;
10824                         iter.count      = 0;
10825                         iter.err        = 0;
10826                         iter.fn         = nf_tables_loop_check_setelem;
10827
10828                         set->ops->walk(ctx, set, &iter);
10829                         if (!iter.err)
10830                                 iter.err = nft_set_catchall_loops(ctx, set);
10831
10832                         if (iter.err < 0)
10833                                 return iter.err;
10834                 }
10835         }
10836
10837         return 0;
10838 }
10839
10840 /**
10841  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10842  *
10843  *      @attr: netlink attribute to fetch value from
10844  *      @max: maximum value to be stored in dest
10845  *      @dest: pointer to the variable
10846  *
10847  *      Parse, check and store a given u32 netlink attribute into variable.
10848  *      This function returns -ERANGE if the value goes over maximum value.
10849  *      Otherwise a 0 is returned and the attribute value is stored in the
10850  *      destination variable.
10851  */
10852 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10853 {
10854         u32 val;
10855
10856         val = ntohl(nla_get_be32(attr));
10857         if (val > max)
10858                 return -ERANGE;
10859
10860         *dest = val;
10861         return 0;
10862 }
10863 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10864
10865 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10866 {
10867         unsigned int reg;
10868
10869         reg = ntohl(nla_get_be32(attr));
10870         switch (reg) {
10871         case NFT_REG_VERDICT...NFT_REG_4:
10872                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10873                 break;
10874         case NFT_REG32_00...NFT_REG32_15:
10875                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10876                 break;
10877         default:
10878                 return -ERANGE;
10879         }
10880
10881         return 0;
10882 }
10883
10884 /**
10885  *      nft_dump_register - dump a register value to a netlink attribute
10886  *
10887  *      @skb: socket buffer
10888  *      @attr: attribute number
10889  *      @reg: register number
10890  *
10891  *      Construct a netlink attribute containing the register number. For
10892  *      compatibility reasons, register numbers being a multiple of 4 are
10893  *      translated to the corresponding 128 bit register numbers.
10894  */
10895 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10896 {
10897         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10898                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10899         else
10900                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10901
10902         return nla_put_be32(skb, attr, htonl(reg));
10903 }
10904 EXPORT_SYMBOL_GPL(nft_dump_register);
10905
10906 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10907 {
10908         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10909                 return -EINVAL;
10910         if (len == 0)
10911                 return -EINVAL;
10912         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10913                 return -ERANGE;
10914
10915         return 0;
10916 }
10917
10918 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10919 {
10920         u32 reg;
10921         int err;
10922
10923         err = nft_parse_register(attr, &reg);
10924         if (err < 0)
10925                 return err;
10926
10927         err = nft_validate_register_load(reg, len);
10928         if (err < 0)
10929                 return err;
10930
10931         *sreg = reg;
10932         return 0;
10933 }
10934 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10935
10936 static int nft_validate_register_store(const struct nft_ctx *ctx,
10937                                        enum nft_registers reg,
10938                                        const struct nft_data *data,
10939                                        enum nft_data_types type,
10940                                        unsigned int len)
10941 {
10942         int err;
10943
10944         switch (reg) {
10945         case NFT_REG_VERDICT:
10946                 if (type != NFT_DATA_VERDICT)
10947                         return -EINVAL;
10948
10949                 if (data != NULL &&
10950                     (data->verdict.code == NFT_GOTO ||
10951                      data->verdict.code == NFT_JUMP)) {
10952                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10953                         if (err < 0)
10954                                 return err;
10955                 }
10956
10957                 return 0;
10958         default:
10959                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10960                         return -EINVAL;
10961                 if (len == 0)
10962                         return -EINVAL;
10963                 if (reg * NFT_REG32_SIZE + len >
10964                     sizeof_field(struct nft_regs, data))
10965                         return -ERANGE;
10966
10967                 if (data != NULL && type != NFT_DATA_VALUE)
10968                         return -EINVAL;
10969                 return 0;
10970         }
10971 }
10972
10973 int nft_parse_register_store(const struct nft_ctx *ctx,
10974                              const struct nlattr *attr, u8 *dreg,
10975                              const struct nft_data *data,
10976                              enum nft_data_types type, unsigned int len)
10977 {
10978         int err;
10979         u32 reg;
10980
10981         err = nft_parse_register(attr, &reg);
10982         if (err < 0)
10983                 return err;
10984
10985         err = nft_validate_register_store(ctx, reg, data, type, len);
10986         if (err < 0)
10987                 return err;
10988
10989         *dreg = reg;
10990         return 0;
10991 }
10992 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10993
10994 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10995         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10996         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10997                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10998         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10999 };
11000
11001 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
11002                             struct nft_data_desc *desc, const struct nlattr *nla)
11003 {
11004         u8 genmask = nft_genmask_next(ctx->net);
11005         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
11006         struct nft_chain *chain;
11007         int err;
11008
11009         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
11010                                           nft_verdict_policy, NULL);
11011         if (err < 0)
11012                 return err;
11013
11014         if (!tb[NFTA_VERDICT_CODE])
11015                 return -EINVAL;
11016
11017         /* zero padding hole for memcmp */
11018         memset(data, 0, sizeof(*data));
11019         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
11020
11021         switch (data->verdict.code) {
11022         case NF_ACCEPT:
11023         case NF_DROP:
11024         case NF_QUEUE:
11025                 break;
11026         case NFT_CONTINUE:
11027         case NFT_BREAK:
11028         case NFT_RETURN:
11029                 break;
11030         case NFT_JUMP:
11031         case NFT_GOTO:
11032                 if (tb[NFTA_VERDICT_CHAIN]) {
11033                         chain = nft_chain_lookup(ctx->net, ctx->table,
11034                                                  tb[NFTA_VERDICT_CHAIN],
11035                                                  genmask);
11036                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
11037                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
11038                                                       tb[NFTA_VERDICT_CHAIN_ID],
11039                                                       genmask);
11040                         if (IS_ERR(chain))
11041                                 return PTR_ERR(chain);
11042                 } else {
11043                         return -EINVAL;
11044                 }
11045
11046                 if (IS_ERR(chain))
11047                         return PTR_ERR(chain);
11048                 if (nft_is_base_chain(chain))
11049                         return -EOPNOTSUPP;
11050                 if (nft_chain_is_bound(chain))
11051                         return -EINVAL;
11052                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
11053                     chain->flags & NFT_CHAIN_BINDING)
11054                         return -EINVAL;
11055                 if (!nft_use_inc(&chain->use))
11056                         return -EMFILE;
11057
11058                 data->verdict.chain = chain;
11059                 break;
11060         default:
11061                 return -EINVAL;
11062         }
11063
11064         desc->len = sizeof(data->verdict);
11065
11066         return 0;
11067 }
11068
11069 static void nft_verdict_uninit(const struct nft_data *data)
11070 {
11071         struct nft_chain *chain;
11072
11073         switch (data->verdict.code) {
11074         case NFT_JUMP:
11075         case NFT_GOTO:
11076                 chain = data->verdict.chain;
11077                 nft_use_dec(&chain->use);
11078                 break;
11079         }
11080 }
11081
11082 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11083 {
11084         struct nlattr *nest;
11085
11086         nest = nla_nest_start_noflag(skb, type);
11087         if (!nest)
11088                 goto nla_put_failure;
11089
11090         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11091                 goto nla_put_failure;
11092
11093         switch (v->code) {
11094         case NFT_JUMP:
11095         case NFT_GOTO:
11096                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11097                                    v->chain->name))
11098                         goto nla_put_failure;
11099         }
11100         nla_nest_end(skb, nest);
11101         return 0;
11102
11103 nla_put_failure:
11104         return -1;
11105 }
11106
11107 static int nft_value_init(const struct nft_ctx *ctx,
11108                           struct nft_data *data, struct nft_data_desc *desc,
11109                           const struct nlattr *nla)
11110 {
11111         unsigned int len;
11112
11113         len = nla_len(nla);
11114         if (len == 0)
11115                 return -EINVAL;
11116         if (len > desc->size)
11117                 return -EOVERFLOW;
11118         if (desc->len) {
11119                 if (len != desc->len)
11120                         return -EINVAL;
11121         } else {
11122                 desc->len = len;
11123         }
11124
11125         nla_memcpy(data->data, nla, len);
11126
11127         return 0;
11128 }
11129
11130 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11131                           unsigned int len)
11132 {
11133         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11134 }
11135
11136 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11137         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
11138         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
11139 };
11140
11141 /**
11142  *      nft_data_init - parse nf_tables data netlink attributes
11143  *
11144  *      @ctx: context of the expression using the data
11145  *      @data: destination struct nft_data
11146  *      @desc: data description
11147  *      @nla: netlink attribute containing data
11148  *
11149  *      Parse the netlink data attributes and initialize a struct nft_data.
11150  *      The type and length of data are returned in the data description.
11151  *
11152  *      The caller can indicate that it only wants to accept data of type
11153  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
11154  */
11155 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11156                   struct nft_data_desc *desc, const struct nlattr *nla)
11157 {
11158         struct nlattr *tb[NFTA_DATA_MAX + 1];
11159         int err;
11160
11161         if (WARN_ON_ONCE(!desc->size))
11162                 return -EINVAL;
11163
11164         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11165                                           nft_data_policy, NULL);
11166         if (err < 0)
11167                 return err;
11168
11169         if (tb[NFTA_DATA_VALUE]) {
11170                 if (desc->type != NFT_DATA_VALUE)
11171                         return -EINVAL;
11172
11173                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11174         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11175                 if (desc->type != NFT_DATA_VERDICT)
11176                         return -EINVAL;
11177
11178                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11179         } else {
11180                 err = -EINVAL;
11181         }
11182
11183         return err;
11184 }
11185 EXPORT_SYMBOL_GPL(nft_data_init);
11186
11187 /**
11188  *      nft_data_release - release a nft_data item
11189  *
11190  *      @data: struct nft_data to release
11191  *      @type: type of data
11192  *
11193  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11194  *      all others need to be released by calling this function.
11195  */
11196 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11197 {
11198         if (type < NFT_DATA_VERDICT)
11199                 return;
11200         switch (type) {
11201         case NFT_DATA_VERDICT:
11202                 return nft_verdict_uninit(data);
11203         default:
11204                 WARN_ON(1);
11205         }
11206 }
11207 EXPORT_SYMBOL_GPL(nft_data_release);
11208
11209 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11210                   enum nft_data_types type, unsigned int len)
11211 {
11212         struct nlattr *nest;
11213         int err;
11214
11215         nest = nla_nest_start_noflag(skb, attr);
11216         if (nest == NULL)
11217                 return -1;
11218
11219         switch (type) {
11220         case NFT_DATA_VALUE:
11221                 err = nft_value_dump(skb, data, len);
11222                 break;
11223         case NFT_DATA_VERDICT:
11224                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11225                 break;
11226         default:
11227                 err = -EINVAL;
11228                 WARN_ON(1);
11229         }
11230
11231         nla_nest_end(skb, nest);
11232         return err;
11233 }
11234 EXPORT_SYMBOL_GPL(nft_data_dump);
11235
11236 int __nft_release_basechain(struct nft_ctx *ctx)
11237 {
11238         struct nft_rule *rule, *nr;
11239
11240         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11241                 return 0;
11242
11243         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11244         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11245                 list_del(&rule->list);
11246                 nft_use_dec(&ctx->chain->use);
11247                 nf_tables_rule_release(ctx, rule);
11248         }
11249         nft_chain_del(ctx->chain);
11250         nft_use_dec(&ctx->table->use);
11251         nf_tables_chain_destroy(ctx);
11252
11253         return 0;
11254 }
11255 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11256
11257 static void __nft_release_hook(struct net *net, struct nft_table *table)
11258 {
11259         struct nft_flowtable *flowtable;
11260         struct nft_chain *chain;
11261
11262         list_for_each_entry(chain, &table->chains, list)
11263                 __nf_tables_unregister_hook(net, table, chain, true);
11264         list_for_each_entry(flowtable, &table->flowtables, list)
11265                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11266                                                      true);
11267 }
11268
11269 static void __nft_release_hooks(struct net *net)
11270 {
11271         struct nftables_pernet *nft_net = nft_pernet(net);
11272         struct nft_table *table;
11273
11274         list_for_each_entry(table, &nft_net->tables, list) {
11275                 if (nft_table_has_owner(table))
11276                         continue;
11277
11278                 __nft_release_hook(net, table);
11279         }
11280 }
11281
11282 static void __nft_release_table(struct net *net, struct nft_table *table)
11283 {
11284         struct nft_flowtable *flowtable, *nf;
11285         struct nft_chain *chain, *nc;
11286         struct nft_object *obj, *ne;
11287         struct nft_rule *rule, *nr;
11288         struct nft_set *set, *ns;
11289         struct nft_ctx ctx = {
11290                 .net    = net,
11291                 .family = NFPROTO_NETDEV,
11292         };
11293
11294         ctx.family = table->family;
11295         ctx.table = table;
11296         list_for_each_entry(chain, &table->chains, list) {
11297                 if (nft_chain_binding(chain))
11298                         continue;
11299
11300                 ctx.chain = chain;
11301                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11302                         list_del(&rule->list);
11303                         nft_use_dec(&chain->use);
11304                         nf_tables_rule_release(&ctx, rule);
11305                 }
11306         }
11307         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11308                 list_del(&flowtable->list);
11309                 nft_use_dec(&table->use);
11310                 nf_tables_flowtable_destroy(flowtable);
11311         }
11312         list_for_each_entry_safe(set, ns, &table->sets, list) {
11313                 list_del(&set->list);
11314                 nft_use_dec(&table->use);
11315                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11316                         nft_map_deactivate(&ctx, set);
11317
11318                 nft_set_destroy(&ctx, set);
11319         }
11320         list_for_each_entry_safe(obj, ne, &table->objects, list) {
11321                 nft_obj_del(obj);
11322                 nft_use_dec(&table->use);
11323                 nft_obj_destroy(&ctx, obj);
11324         }
11325         list_for_each_entry_safe(chain, nc, &table->chains, list) {
11326                 ctx.chain = chain;
11327                 nft_chain_del(chain);
11328                 nft_use_dec(&table->use);
11329                 nf_tables_chain_destroy(&ctx);
11330         }
11331         nf_tables_table_destroy(&ctx);
11332 }
11333
11334 static void __nft_release_tables(struct net *net)
11335 {
11336         struct nftables_pernet *nft_net = nft_pernet(net);
11337         struct nft_table *table, *nt;
11338
11339         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11340                 if (nft_table_has_owner(table))
11341                         continue;
11342
11343                 list_del(&table->list);
11344
11345                 __nft_release_table(net, table);
11346         }
11347 }
11348
11349 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11350                             void *ptr)
11351 {
11352         struct nft_table *table, *to_delete[8];
11353         struct nftables_pernet *nft_net;
11354         struct netlink_notify *n = ptr;
11355         struct net *net = n->net;
11356         unsigned int deleted;
11357         bool restart = false;
11358         unsigned int gc_seq;
11359
11360         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11361                 return NOTIFY_DONE;
11362
11363         nft_net = nft_pernet(net);
11364         deleted = 0;
11365         mutex_lock(&nft_net->commit_mutex);
11366
11367         gc_seq = nft_gc_seq_begin(nft_net);
11368
11369         if (!list_empty(&nf_tables_destroy_list))
11370                 nf_tables_trans_destroy_flush_work();
11371 again:
11372         list_for_each_entry(table, &nft_net->tables, list) {
11373                 if (nft_table_has_owner(table) &&
11374                     n->portid == table->nlpid) {
11375                         if (table->flags & NFT_TABLE_F_PERSIST) {
11376                                 table->flags &= ~NFT_TABLE_F_OWNER;
11377                                 continue;
11378                         }
11379                         __nft_release_hook(net, table);
11380                         list_del_rcu(&table->list);
11381                         to_delete[deleted++] = table;
11382                         if (deleted >= ARRAY_SIZE(to_delete))
11383                                 break;
11384                 }
11385         }
11386         if (deleted) {
11387                 restart = deleted >= ARRAY_SIZE(to_delete);
11388                 synchronize_rcu();
11389                 while (deleted)
11390                         __nft_release_table(net, to_delete[--deleted]);
11391
11392                 if (restart)
11393                         goto again;
11394         }
11395         nft_gc_seq_end(nft_net, gc_seq);
11396
11397         mutex_unlock(&nft_net->commit_mutex);
11398
11399         return NOTIFY_DONE;
11400 }
11401
11402 static struct notifier_block nft_nl_notifier = {
11403         .notifier_call  = nft_rcv_nl_event,
11404 };
11405
11406 static int __net_init nf_tables_init_net(struct net *net)
11407 {
11408         struct nftables_pernet *nft_net = nft_pernet(net);
11409
11410         INIT_LIST_HEAD(&nft_net->tables);
11411         INIT_LIST_HEAD(&nft_net->commit_list);
11412         INIT_LIST_HEAD(&nft_net->binding_list);
11413         INIT_LIST_HEAD(&nft_net->module_list);
11414         INIT_LIST_HEAD(&nft_net->notify_list);
11415         mutex_init(&nft_net->commit_mutex);
11416         nft_net->base_seq = 1;
11417         nft_net->gc_seq = 0;
11418         nft_net->validate_state = NFT_VALIDATE_SKIP;
11419
11420         return 0;
11421 }
11422
11423 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11424 {
11425         struct nftables_pernet *nft_net = nft_pernet(net);
11426
11427         mutex_lock(&nft_net->commit_mutex);
11428         __nft_release_hooks(net);
11429         mutex_unlock(&nft_net->commit_mutex);
11430 }
11431
11432 static void __net_exit nf_tables_exit_net(struct net *net)
11433 {
11434         struct nftables_pernet *nft_net = nft_pernet(net);
11435         unsigned int gc_seq;
11436
11437         mutex_lock(&nft_net->commit_mutex);
11438
11439         gc_seq = nft_gc_seq_begin(nft_net);
11440
11441         if (!list_empty(&nft_net->commit_list) ||
11442             !list_empty(&nft_net->module_list))
11443                 __nf_tables_abort(net, NFNL_ABORT_NONE);
11444
11445         __nft_release_tables(net);
11446
11447         nft_gc_seq_end(nft_net, gc_seq);
11448
11449         mutex_unlock(&nft_net->commit_mutex);
11450         WARN_ON_ONCE(!list_empty(&nft_net->tables));
11451         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11452         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11453 }
11454
11455 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11456 {
11457         flush_work(&trans_gc_work);
11458 }
11459
11460 static struct pernet_operations nf_tables_net_ops = {
11461         .init           = nf_tables_init_net,
11462         .pre_exit       = nf_tables_pre_exit_net,
11463         .exit           = nf_tables_exit_net,
11464         .exit_batch     = nf_tables_exit_batch,
11465         .id             = &nf_tables_net_id,
11466         .size           = sizeof(struct nftables_pernet),
11467 };
11468
11469 static int __init nf_tables_module_init(void)
11470 {
11471         int err;
11472
11473         err = register_pernet_subsys(&nf_tables_net_ops);
11474         if (err < 0)
11475                 return err;
11476
11477         err = nft_chain_filter_init();
11478         if (err < 0)
11479                 goto err_chain_filter;
11480
11481         err = nf_tables_core_module_init();
11482         if (err < 0)
11483                 goto err_core_module;
11484
11485         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11486         if (err < 0)
11487                 goto err_netdev_notifier;
11488
11489         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11490         if (err < 0)
11491                 goto err_rht_objname;
11492
11493         err = nft_offload_init();
11494         if (err < 0)
11495                 goto err_offload;
11496
11497         err = netlink_register_notifier(&nft_nl_notifier);
11498         if (err < 0)
11499                 goto err_netlink_notifier;
11500
11501         /* must be last */
11502         err = nfnetlink_subsys_register(&nf_tables_subsys);
11503         if (err < 0)
11504                 goto err_nfnl_subsys;
11505
11506         nft_chain_route_init();
11507
11508         return err;
11509
11510 err_nfnl_subsys:
11511         netlink_unregister_notifier(&nft_nl_notifier);
11512 err_netlink_notifier:
11513         nft_offload_exit();
11514 err_offload:
11515         rhltable_destroy(&nft_objname_ht);
11516 err_rht_objname:
11517         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11518 err_netdev_notifier:
11519         nf_tables_core_module_exit();
11520 err_core_module:
11521         nft_chain_filter_fini();
11522 err_chain_filter:
11523         unregister_pernet_subsys(&nf_tables_net_ops);
11524         return err;
11525 }
11526
11527 static void __exit nf_tables_module_exit(void)
11528 {
11529         nfnetlink_subsys_unregister(&nf_tables_subsys);
11530         netlink_unregister_notifier(&nft_nl_notifier);
11531         nft_offload_exit();
11532         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11533         nft_chain_filter_fini();
11534         nft_chain_route_fini();
11535         unregister_pernet_subsys(&nf_tables_net_ops);
11536         cancel_work_sync(&trans_gc_work);
11537         cancel_work_sync(&trans_destroy_work);
11538         rcu_barrier();
11539         rhltable_destroy(&nft_objname_ht);
11540         nf_tables_core_module_exit();
11541 }
11542
11543 module_init(nf_tables_module_init);
11544 module_exit(nf_tables_module_exit);
11545
11546 MODULE_LICENSE("GPL");
11547 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11548 MODULE_DESCRIPTION("Framework for packet filtering and classification");
11549 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);