net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
 106 {
 107         switch (table->validate_state) {
 108         case NFT_VALIDATE_SKIP:
 109                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 110                 break;
 111         case NFT_VALIDATE_NEED:
 112                 break;
 113         case NFT_VALIDATE_DO:
 114                 if (new_validate_state == NFT_VALIDATE_NEED)
 115                         return;
 116         }
 117
 118         table->validate_state = new_validate_state;
 119 }
 120 static void nf_tables_trans_destroy_work(struct work_struct *w);
 121 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 122
 123 static void nft_ctx_init(struct nft_ctx *ctx,
 124                          struct net *net,
 125                          const struct sk_buff *skb,
 126                          const struct nlmsghdr *nlh,
 127                          u8 family,
 128                          struct nft_table *table,
 129                          struct nft_chain *chain,
 130                          const struct nlattr * const *nla)
 131 {
 132         ctx->net        = net;
 133         ctx->family     = family;
 134         ctx->level      = 0;
 135         ctx->table      = table;
 136         ctx->chain      = chain;
 137         ctx->nla        = nla;
 138         ctx->portid     = NETLINK_CB(skb).portid;
 139         ctx->report     = nlmsg_report(nlh);
 140         ctx->flags      = nlh->nlmsg_flags;
 141         ctx->seq        = nlh->nlmsg_seq;
 142 }
 143
 144 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 145                                              int msg_type, u32 size, gfp_t gfp)
 146 {
 147         struct nft_trans *trans;
 148
 149         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 150         if (trans == NULL)
 151                 return NULL;
 152
 153         INIT_LIST_HEAD(&trans->list);
 154         INIT_LIST_HEAD(&trans->binding_list);
 155         trans->msg_type = msg_type;
 156         trans->ctx      = *ctx;
 157
 158         return trans;
 159 }
 160
 161 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 162                                          int msg_type, u32 size)
 163 {
 164         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 165 }
 166
 167 static void nft_trans_list_del(struct nft_trans *trans)
 168 {
 169         list_del(&trans->list);
 170         list_del(&trans->binding_list);
 171 }
 172
 173 static void nft_trans_destroy(struct nft_trans *trans)
 174 {
 175         nft_trans_list_del(trans);
 176         kfree(trans);
 177 }
 178
 179 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
 180                                  bool bind)
 181 {
 182         struct nftables_pernet *nft_net;
 183         struct net *net = ctx->net;
 184         struct nft_trans *trans;
 185
 186         if (!nft_set_is_anonymous(set))
 187                 return;
 188
 189         nft_net = nft_pernet(net);
 190         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 191                 switch (trans->msg_type) {
 192                 case NFT_MSG_NEWSET:
 193                         if (nft_trans_set(trans) == set)
 194                                 nft_trans_set_bound(trans) = bind;
 195                         break;
 196                 case NFT_MSG_NEWSETELEM:
 197                         if (nft_trans_elem_set(trans) == set)
 198                                 nft_trans_elem_set_bound(trans) = bind;
 199                         break;
 200                 }
 201         }
 202 }
 203
 204 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 205 {
 206         return __nft_set_trans_bind(ctx, set, true);
 207 }
 208
 209 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
 210 {
 211         return __nft_set_trans_bind(ctx, set, false);
 212 }
 213
 214 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
 215                                    struct nft_chain *chain, bool bind)
 216 {
 217         struct nftables_pernet *nft_net;
 218         struct net *net = ctx->net;
 219         struct nft_trans *trans;
 220
 221         if (!nft_chain_binding(chain))
 222                 return;
 223
 224         nft_net = nft_pernet(net);
 225         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 226                 switch (trans->msg_type) {
 227                 case NFT_MSG_NEWCHAIN:
 228                         if (nft_trans_chain(trans) == chain)
 229                                 nft_trans_chain_bound(trans) = bind;
 230                         break;
 231                 case NFT_MSG_NEWRULE:
 232                         if (trans->ctx.chain == chain)
 233                                 nft_trans_rule_bound(trans) = bind;
 234                         break;
 235                 }
 236         }
 237 }
 238
 239 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
 240                                  struct nft_chain *chain)
 241 {
 242         __nft_chain_trans_bind(ctx, chain, true);
 243 }
 244
 245 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 246 {
 247         if (!nft_chain_binding(chain))
 248                 return 0;
 249
 250         if (nft_chain_binding(ctx->chain))
 251                 return -EOPNOTSUPP;
 252
 253         if (chain->bound)
 254                 return -EBUSY;
 255
 256         if (!nft_use_inc(&chain->use))
 257                 return -EMFILE;
 258
 259         chain->bound = true;
 260         nft_chain_trans_bind(ctx, chain);
 261
 262         return 0;
 263 }
 264
 265 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
 266 {
 267         __nft_chain_trans_bind(ctx, chain, false);
 268 }
 269
 270 static int nft_netdev_register_hooks(struct net *net,
 271                                      struct list_head *hook_list)
 272 {
 273         struct nft_hook *hook;
 274         int err, j;
 275
 276         j = 0;
 277         list_for_each_entry(hook, hook_list, list) {
 278                 err = nf_register_net_hook(net, &hook->ops);
 279                 if (err < 0)
 280                         goto err_register;
 281
 282                 j++;
 283         }
 284         return 0;
 285
 286 err_register:
 287         list_for_each_entry(hook, hook_list, list) {
 288                 if (j-- <= 0)
 289                         break;
 290
 291                 nf_unregister_net_hook(net, &hook->ops);
 292         }
 293         return err;
 294 }
 295
 296 static void nft_netdev_unregister_hooks(struct net *net,
 297                                         struct list_head *hook_list,
 298                                         bool release_netdev)
 299 {
 300         struct nft_hook *hook, *next;
 301
 302         list_for_each_entry_safe(hook, next, hook_list, list) {
 303                 nf_unregister_net_hook(net, &hook->ops);
 304                 if (release_netdev) {
 305                         list_del(&hook->list);
 306                         kfree_rcu(hook, rcu);
 307                 }
 308         }
 309 }
 310
 311 static int nf_tables_register_hook(struct net *net,
 312                                    const struct nft_table *table,
 313                                    struct nft_chain *chain)
 314 {
 315         struct nft_base_chain *basechain;
 316         const struct nf_hook_ops *ops;
 317
 318         if (table->flags & NFT_TABLE_F_DORMANT ||
 319             !nft_is_base_chain(chain))
 320                 return 0;
 321
 322         basechain = nft_base_chain(chain);
 323         ops = &basechain->ops;
 324
 325         if (basechain->type->ops_register)
 326                 return basechain->type->ops_register(net, ops);
 327
 328         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 329                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 330
 331         return nf_register_net_hook(net, &basechain->ops);
 332 }
 333
 334 static void __nf_tables_unregister_hook(struct net *net,
 335                                         const struct nft_table *table,
 336                                         struct nft_chain *chain,
 337                                         bool release_netdev)
 338 {
 339         struct nft_base_chain *basechain;
 340         const struct nf_hook_ops *ops;
 341
 342         if (table->flags & NFT_TABLE_F_DORMANT ||
 343             !nft_is_base_chain(chain))
 344                 return;
 345         basechain = nft_base_chain(chain);
 346         ops = &basechain->ops;
 347
 348         if (basechain->type->ops_unregister)
 349                 return basechain->type->ops_unregister(net, ops);
 350
 351         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 352                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 353                                             release_netdev);
 354         else
 355                 nf_unregister_net_hook(net, &basechain->ops);
 356 }
 357
 358 static void nf_tables_unregister_hook(struct net *net,
 359                                       const struct nft_table *table,
 360                                       struct nft_chain *chain)
 361 {
 362         return __nf_tables_unregister_hook(net, table, chain, false);
 363 }
 364
 365 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 366 {
 367         struct nftables_pernet *nft_net = nft_pernet(net);
 368
 369         switch (trans->msg_type) {
 370         case NFT_MSG_NEWSET:
 371                 if (!nft_trans_set_update(trans) &&
 372                     nft_set_is_anonymous(nft_trans_set(trans)))
 373                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 374                 break;
 375         case NFT_MSG_NEWCHAIN:
 376                 if (!nft_trans_chain_update(trans) &&
 377                     nft_chain_binding(nft_trans_chain(trans)))
 378                         list_add_tail(&trans->binding_list, &nft_net->binding_list);
 379                 break;
 380         }
 381
 382         list_add_tail(&trans->list, &nft_net->commit_list);
 383 }
 384
 385 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 386 {
 387         struct nft_trans *trans;
 388
 389         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 390         if (trans == NULL)
 391                 return -ENOMEM;
 392
 393         if (msg_type == NFT_MSG_NEWTABLE)
 394                 nft_activate_next(ctx->net, ctx->table);
 395
 396         nft_trans_commit_list_add_tail(ctx->net, trans);
 397         return 0;
 398 }
 399
 400 static int nft_deltable(struct nft_ctx *ctx)
 401 {
 402         int err;
 403
 404         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 405         if (err < 0)
 406                 return err;
 407
 408         nft_deactivate_next(ctx->net, ctx->table);
 409         return err;
 410 }
 411
 412 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 413 {
 414         struct nft_trans *trans;
 415
 416         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 417         if (trans == NULL)
 418                 return ERR_PTR(-ENOMEM);
 419
 420         if (msg_type == NFT_MSG_NEWCHAIN) {
 421                 nft_activate_next(ctx->net, ctx->chain);
 422
 423                 if (ctx->nla[NFTA_CHAIN_ID]) {
 424                         nft_trans_chain_id(trans) =
 425                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 426                 }
 427         }
 428         nft_trans_chain(trans) = ctx->chain;
 429         nft_trans_commit_list_add_tail(ctx->net, trans);
 430
 431         return trans;
 432 }
 433
 434 static int nft_delchain(struct nft_ctx *ctx)
 435 {
 436         struct nft_trans *trans;
 437
 438         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 439         if (IS_ERR(trans))
 440                 return PTR_ERR(trans);
 441
 442         nft_use_dec(&ctx->table->use);
 443         nft_deactivate_next(ctx->net, ctx->chain);
 444
 445         return 0;
 446 }
 447
 448 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
 449 {
 450         struct nft_expr *expr;
 451
 452         expr = nft_expr_first(rule);
 453         while (nft_expr_more(rule, expr)) {
 454                 if (expr->ops->activate)
 455                         expr->ops->activate(ctx, expr);
 456
 457                 expr = nft_expr_next(expr);
 458         }
 459 }
 460
 461 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
 462                               enum nft_trans_phase phase)
 463 {
 464         struct nft_expr *expr;
 465
 466         expr = nft_expr_first(rule);
 467         while (nft_expr_more(rule, expr)) {
 468                 if (expr->ops->deactivate)
 469                         expr->ops->deactivate(ctx, expr, phase);
 470
 471                 expr = nft_expr_next(expr);
 472         }
 473 }
 474
 475 static int
 476 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 477 {
 478         /* You cannot delete the same rule twice */
 479         if (nft_is_active_next(ctx->net, rule)) {
 480                 nft_deactivate_next(ctx->net, rule);
 481                 nft_use_dec(&ctx->chain->use);
 482                 return 0;
 483         }
 484         return -ENOENT;
 485 }
 486
 487 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 488                                             struct nft_rule *rule)
 489 {
 490         struct nft_trans *trans;
 491
 492         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 493         if (trans == NULL)
 494                 return NULL;
 495
 496         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 497                 nft_trans_rule_id(trans) =
 498                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 499         }
 500         nft_trans_rule(trans) = rule;
 501         nft_trans_commit_list_add_tail(ctx->net, trans);
 502
 503         return trans;
 504 }
 505
 506 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 507 {
 508         struct nft_flow_rule *flow;
 509         struct nft_trans *trans;
 510         int err;
 511
 512         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 513         if (trans == NULL)
 514                 return -ENOMEM;
 515
 516         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 517                 flow = nft_flow_rule_create(ctx->net, rule);
 518                 if (IS_ERR(flow)) {
 519                         nft_trans_destroy(trans);
 520                         return PTR_ERR(flow);
 521                 }
 522
 523                 nft_trans_flow_rule(trans) = flow;
 524         }
 525
 526         err = nf_tables_delrule_deactivate(ctx, rule);
 527         if (err < 0) {
 528                 nft_trans_destroy(trans);
 529                 return err;
 530         }
 531         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 532
 533         return 0;
 534 }
 535
 536 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 537 {
 538         struct nft_rule *rule;
 539         int err;
 540
 541         list_for_each_entry(rule, &ctx->chain->rules, list) {
 542                 if (!nft_is_active_next(ctx->net, rule))
 543                         continue;
 544
 545                 err = nft_delrule(ctx, rule);
 546                 if (err < 0)
 547                         return err;
 548         }
 549         return 0;
 550 }
 551
 552 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 553                                struct nft_set *set,
 554                                const struct nft_set_desc *desc)
 555 {
 556         struct nft_trans *trans;
 557
 558         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 559         if (trans == NULL)
 560                 return -ENOMEM;
 561
 562         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
 563                 nft_trans_set_id(trans) =
 564                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 565                 nft_activate_next(ctx->net, set);
 566         }
 567         nft_trans_set(trans) = set;
 568         if (desc) {
 569                 nft_trans_set_update(trans) = true;
 570                 nft_trans_set_gc_int(trans) = desc->gc_int;
 571                 nft_trans_set_timeout(trans) = desc->timeout;
 572                 nft_trans_set_size(trans) = desc->size;
 573         }
 574         nft_trans_commit_list_add_tail(ctx->net, trans);
 575
 576         return 0;
 577 }
 578
 579 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 580                              struct nft_set *set)
 581 {
 582         return __nft_trans_set_add(ctx, msg_type, set, NULL);
 583 }
 584
 585 static void nft_setelem_data_deactivate(const struct net *net,
 586                                         const struct nft_set *set,
 587                                         struct nft_set_elem *elem);
 588
 589 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
 590                                   struct nft_set *set,
 591                                   const struct nft_set_iter *iter,
 592                                   struct nft_set_elem *elem)
 593 {
 594         nft_setelem_data_deactivate(ctx->net, set, elem);
 595
 596         return 0;
 597 }
 598
 599 struct nft_set_elem_catchall {
 600         struct list_head        list;
 601         struct rcu_head         rcu;
 602         void                    *elem;
 603 };
 604
 605 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
 606                                         struct nft_set *set)
 607 {
 608         u8 genmask = nft_genmask_next(ctx->net);
 609         struct nft_set_elem_catchall *catchall;
 610         struct nft_set_elem elem;
 611         struct nft_set_ext *ext;
 612
 613         list_for_each_entry(catchall, &set->catchall_list, list) {
 614                 ext = nft_set_elem_ext(set, catchall->elem);
 615                 if (!nft_set_elem_active(ext, genmask))
 616                         continue;
 617
 618                 elem.priv = catchall->elem;
 619                 nft_setelem_data_deactivate(ctx->net, set, &elem);
 620                 break;
 621         }
 622 }
 623
 624 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
 625 {
 626         struct nft_set_iter iter = {
 627                 .genmask        = nft_genmask_next(ctx->net),
 628                 .fn             = nft_mapelem_deactivate,
 629         };
 630
 631         set->ops->walk(ctx, set, &iter);
 632         WARN_ON_ONCE(iter.err);
 633
 634         nft_map_catchall_deactivate(ctx, set);
 635 }
 636
 637 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 638 {
 639         int err;
 640
 641         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 642         if (err < 0)
 643                 return err;
 644
 645         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
 646                 nft_map_deactivate(ctx, set);
 647
 648         nft_deactivate_next(ctx->net, set);
 649         nft_use_dec(&ctx->table->use);
 650
 651         return err;
 652 }
 653
 654 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 655                              struct nft_object *obj)
 656 {
 657         struct nft_trans *trans;
 658
 659         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 660         if (trans == NULL)
 661                 return -ENOMEM;
 662
 663         if (msg_type == NFT_MSG_NEWOBJ)
 664                 nft_activate_next(ctx->net, obj);
 665
 666         nft_trans_obj(trans) = obj;
 667         nft_trans_commit_list_add_tail(ctx->net, trans);
 668
 669         return 0;
 670 }
 671
 672 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 673 {
 674         int err;
 675
 676         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 677         if (err < 0)
 678                 return err;
 679
 680         nft_deactivate_next(ctx->net, obj);
 681         nft_use_dec(&ctx->table->use);
 682
 683         return err;
 684 }
 685
 686 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 687                                    struct nft_flowtable *flowtable)
 688 {
 689         struct nft_trans *trans;
 690
 691         trans = nft_trans_alloc(ctx, msg_type,
 692                                 sizeof(struct nft_trans_flowtable));
 693         if (trans == NULL)
 694                 return -ENOMEM;
 695
 696         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 697                 nft_activate_next(ctx->net, flowtable);
 698
 699         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 700         nft_trans_flowtable(trans) = flowtable;
 701         nft_trans_commit_list_add_tail(ctx->net, trans);
 702
 703         return 0;
 704 }
 705
 706 static int nft_delflowtable(struct nft_ctx *ctx,
 707                             struct nft_flowtable *flowtable)
 708 {
 709         int err;
 710
 711         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 712         if (err < 0)
 713                 return err;
 714
 715         nft_deactivate_next(ctx->net, flowtable);
 716         nft_use_dec(&ctx->table->use);
 717
 718         return err;
 719 }
 720
 721 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 722 {
 723         int i;
 724
 725         for (i = track->regs[dreg].num_reg; i > 0; i--)
 726                 __nft_reg_track_cancel(track, dreg - i);
 727 }
 728
 729 static void __nft_reg_track_update(struct nft_regs_track *track,
 730                                    const struct nft_expr *expr,
 731                                    u8 dreg, u8 num_reg)
 732 {
 733         track->regs[dreg].selector = expr;
 734         track->regs[dreg].bitwise = NULL;
 735         track->regs[dreg].num_reg = num_reg;
 736 }
 737
 738 void nft_reg_track_update(struct nft_regs_track *track,
 739                           const struct nft_expr *expr, u8 dreg, u8 len)
 740 {
 741         unsigned int regcount;
 742         int i;
 743
 744         __nft_reg_track_clobber(track, dreg);
 745
 746         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 747         for (i = 0; i < regcount; i++, dreg++)
 748                 __nft_reg_track_update(track, expr, dreg, i);
 749 }
 750 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 751
 752 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 753 {
 754         unsigned int regcount;
 755         int i;
 756
 757         __nft_reg_track_clobber(track, dreg);
 758
 759         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 760         for (i = 0; i < regcount; i++, dreg++)
 761                 __nft_reg_track_cancel(track, dreg);
 762 }
 763 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 764
 765 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 766 {
 767         track->regs[dreg].selector = NULL;
 768         track->regs[dreg].bitwise = NULL;
 769         track->regs[dreg].num_reg = 0;
 770 }
 771 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 772
 773 /*
 774  * Tables
 775  */
 776
 777 static struct nft_table *nft_table_lookup(const struct net *net,
 778                                           const struct nlattr *nla,
 779                                           u8 family, u8 genmask, u32 nlpid)
 780 {
 781         struct nftables_pernet *nft_net;
 782         struct nft_table *table;
 783
 784         if (nla == NULL)
 785                 return ERR_PTR(-EINVAL);
 786
 787         nft_net = nft_pernet(net);
 788         list_for_each_entry_rcu(table, &nft_net->tables, list,
 789                                 lockdep_is_held(&nft_net->commit_mutex)) {
 790                 if (!nla_strcmp(nla, table->name) &&
 791                     table->family == family &&
 792                     nft_active_genmask(table, genmask)) {
 793                         if (nft_table_has_owner(table) &&
 794                             nlpid && table->nlpid != nlpid)
 795                                 return ERR_PTR(-EPERM);
 796
 797                         return table;
 798                 }
 799         }
 800
 801         return ERR_PTR(-ENOENT);
 802 }
 803
 804 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 805                                                    const struct nlattr *nla,
 806                                                    u8 genmask, u32 nlpid)
 807 {
 808         struct nftables_pernet *nft_net;
 809         struct nft_table *table;
 810
 811         nft_net = nft_pernet(net);
 812         list_for_each_entry(table, &nft_net->tables, list) {
 813                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 814                     nft_active_genmask(table, genmask)) {
 815                         if (nft_table_has_owner(table) &&
 816                             nlpid && table->nlpid != nlpid)
 817                                 return ERR_PTR(-EPERM);
 818
 819                         return table;
 820                 }
 821         }
 822
 823         return ERR_PTR(-ENOENT);
 824 }
 825
 826 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 827 {
 828         return ++table->hgenerator;
 829 }
 830
 831 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 832
 833 static const struct nft_chain_type *
 834 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 835 {
 836         if (family >= NFPROTO_NUMPROTO ||
 837             type >= NFT_CHAIN_T_MAX)
 838                 return NULL;
 839
 840         return chain_type[family][type];
 841 }
 842
 843 static const struct nft_chain_type *
 844 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 845 {
 846         const struct nft_chain_type *type;
 847         int i;
 848
 849         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 850                 type = __nft_chain_type_get(family, i);
 851                 if (!type)
 852                         continue;
 853                 if (!nla_strcmp(nla, type->name))
 854                         return type;
 855         }
 856         return NULL;
 857 }
 858
 859 struct nft_module_request {
 860         struct list_head        list;
 861         char                    module[MODULE_NAME_LEN];
 862         bool                    done;
 863 };
 864
 865 #ifdef CONFIG_MODULES
 866 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 867                                       ...)
 868 {
 869         char module_name[MODULE_NAME_LEN];
 870         struct nftables_pernet *nft_net;
 871         struct nft_module_request *req;
 872         va_list args;
 873         int ret;
 874
 875         va_start(args, fmt);
 876         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 877         va_end(args);
 878         if (ret >= MODULE_NAME_LEN)
 879                 return 0;
 880
 881         nft_net = nft_pernet(net);
 882         list_for_each_entry(req, &nft_net->module_list, list) {
 883                 if (!strcmp(req->module, module_name)) {
 884                         if (req->done)
 885                                 return 0;
 886
 887                         /* A request to load this module already exists. */
 888                         return -EAGAIN;
 889                 }
 890         }
 891
 892         req = kmalloc(sizeof(*req), GFP_KERNEL);
 893         if (!req)
 894                 return -ENOMEM;
 895
 896         req->done = false;
 897         strscpy(req->module, module_name, MODULE_NAME_LEN);
 898         list_add_tail(&req->list, &nft_net->module_list);
 899
 900         return -EAGAIN;
 901 }
 902 EXPORT_SYMBOL_GPL(nft_request_module);
 903 #endif
 904
 905 static void lockdep_nfnl_nft_mutex_not_held(void)
 906 {
 907 #ifdef CONFIG_PROVE_LOCKING
 908         if (debug_locks)
 909                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 910 #endif
 911 }
 912
 913 static const struct nft_chain_type *
 914 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 915                             u8 family, bool autoload)
 916 {
 917         const struct nft_chain_type *type;
 918
 919         type = __nf_tables_chain_type_lookup(nla, family);
 920         if (type != NULL)
 921                 return type;
 922
 923         lockdep_nfnl_nft_mutex_not_held();
 924 #ifdef CONFIG_MODULES
 925         if (autoload) {
 926                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 927                                        nla_len(nla),
 928                                        (const char *)nla_data(nla)) == -EAGAIN)
 929                         return ERR_PTR(-EAGAIN);
 930         }
 931 #endif
 932         return ERR_PTR(-ENOENT);
 933 }
 934
 935 static __be16 nft_base_seq(const struct net *net)
 936 {
 937         struct nftables_pernet *nft_net = nft_pernet(net);
 938
 939         return htons(nft_net->base_seq & 0xffff);
 940 }
 941
 942 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 943         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 944                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 945         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 946         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 947         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 948                                     .len = NFT_USERDATA_MAXLEN }
 949 };
 950
 951 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 952                                      u32 portid, u32 seq, int event, u32 flags,
 953                                      int family, const struct nft_table *table)
 954 {
 955         struct nlmsghdr *nlh;
 956
 957         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 958         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 959                            NFNETLINK_V0, nft_base_seq(net));
 960         if (!nlh)
 961                 goto nla_put_failure;
 962
 963         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 964             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 965             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 966                          NFTA_TABLE_PAD))
 967                 goto nla_put_failure;
 968
 969         if (event == NFT_MSG_DELTABLE) {
 970                 nlmsg_end(skb, nlh);
 971                 return 0;
 972         }
 973
 974         if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
 975                          htonl(table->flags & NFT_TABLE_F_MASK)))
 976                 goto nla_put_failure;
 977
 978         if (nft_table_has_owner(table) &&
 979             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 980                 goto nla_put_failure;
 981
 982         if (table->udata) {
 983                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 984                         goto nla_put_failure;
 985         }
 986
 987         nlmsg_end(skb, nlh);
 988         return 0;
 989
 990 nla_put_failure:
 991         nlmsg_trim(skb, nlh);
 992         return -1;
 993 }
 994
 995 struct nftnl_skb_parms {
 996         bool report;
 997 };
 998 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 999
1000 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1001                                struct list_head *notify_list)
1002 {
1003         NFT_CB(skb).report = report;
1004         list_add_tail(&skb->list, notify_list);
1005 }
1006
1007 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1008 {
1009         struct nftables_pernet *nft_net;
1010         struct sk_buff *skb;
1011         u16 flags = 0;
1012         int err;
1013
1014         if (!ctx->report &&
1015             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1016                 return;
1017
1018         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1019         if (skb == NULL)
1020                 goto err;
1021
1022         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1023                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1024
1025         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1026                                         event, flags, ctx->family, ctx->table);
1027         if (err < 0) {
1028                 kfree_skb(skb);
1029                 goto err;
1030         }
1031
1032         nft_net = nft_pernet(ctx->net);
1033         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1034         return;
1035 err:
1036         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1037 }
1038
1039 static int nf_tables_dump_tables(struct sk_buff *skb,
1040                                  struct netlink_callback *cb)
1041 {
1042         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1043         struct nftables_pernet *nft_net;
1044         const struct nft_table *table;
1045         unsigned int idx = 0, s_idx = cb->args[0];
1046         struct net *net = sock_net(skb->sk);
1047         int family = nfmsg->nfgen_family;
1048
1049         rcu_read_lock();
1050         nft_net = nft_pernet(net);
1051         cb->seq = READ_ONCE(nft_net->base_seq);
1052
1053         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1054                 if (family != NFPROTO_UNSPEC && family != table->family)
1055                         continue;
1056
1057                 if (idx < s_idx)
1058                         goto cont;
1059                 if (idx > s_idx)
1060                         memset(&cb->args[1], 0,
1061                                sizeof(cb->args) - sizeof(cb->args[0]));
1062                 if (!nft_is_active(net, table))
1063                         continue;
1064                 if (nf_tables_fill_table_info(skb, net,
1065                                               NETLINK_CB(cb->skb).portid,
1066                                               cb->nlh->nlmsg_seq,
1067                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
1068                                               table->family, table) < 0)
1069                         goto done;
1070
1071                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1072 cont:
1073                 idx++;
1074         }
1075 done:
1076         rcu_read_unlock();
1077         cb->args[0] = idx;
1078         return skb->len;
1079 }
1080
1081 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1082                                       const struct nlmsghdr *nlh,
1083                                       struct netlink_dump_control *c)
1084 {
1085         int err;
1086
1087         if (!try_module_get(THIS_MODULE))
1088                 return -EINVAL;
1089
1090         rcu_read_unlock();
1091         err = netlink_dump_start(nlsk, skb, nlh, c);
1092         rcu_read_lock();
1093         module_put(THIS_MODULE);
1094
1095         return err;
1096 }
1097
1098 /* called with rcu_read_lock held */
1099 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1100                               const struct nlattr * const nla[])
1101 {
1102         struct netlink_ext_ack *extack = info->extack;
1103         u8 genmask = nft_genmask_cur(info->net);
1104         u8 family = info->nfmsg->nfgen_family;
1105         const struct nft_table *table;
1106         struct net *net = info->net;
1107         struct sk_buff *skb2;
1108         int err;
1109
1110         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1111                 struct netlink_dump_control c = {
1112                         .dump = nf_tables_dump_tables,
1113                         .module = THIS_MODULE,
1114                 };
1115
1116                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1117         }
1118
1119         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1120         if (IS_ERR(table)) {
1121                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1122                 return PTR_ERR(table);
1123         }
1124
1125         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1126         if (!skb2)
1127                 return -ENOMEM;
1128
1129         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1130                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1131                                         0, family, table);
1132         if (err < 0)
1133                 goto err_fill_table_info;
1134
1135         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1136
1137 err_fill_table_info:
1138         kfree_skb(skb2);
1139         return err;
1140 }
1141
1142 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1143 {
1144         struct nft_chain *chain;
1145         u32 i = 0;
1146
1147         list_for_each_entry(chain, &table->chains, list) {
1148                 if (!nft_is_active_next(net, chain))
1149                         continue;
1150                 if (!nft_is_base_chain(chain))
1151                         continue;
1152
1153                 if (cnt && i++ == cnt)
1154                         break;
1155
1156                 nf_tables_unregister_hook(net, table, chain);
1157         }
1158 }
1159
1160 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1161 {
1162         struct nft_chain *chain;
1163         int err, i = 0;
1164
1165         list_for_each_entry(chain, &table->chains, list) {
1166                 if (!nft_is_active_next(net, chain))
1167                         continue;
1168                 if (!nft_is_base_chain(chain))
1169                         continue;
1170
1171                 err = nf_tables_register_hook(net, table, chain);
1172                 if (err < 0)
1173                         goto err_register_hooks;
1174
1175                 i++;
1176         }
1177         return 0;
1178
1179 err_register_hooks:
1180         if (i)
1181                 nft_table_disable(net, table, i);
1182         return err;
1183 }
1184
1185 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1186 {
1187         table->flags &= ~NFT_TABLE_F_DORMANT;
1188         nft_table_disable(net, table, 0);
1189         table->flags |= NFT_TABLE_F_DORMANT;
1190 }
1191
1192 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1193 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1194 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1195 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1196                                          __NFT_TABLE_F_WAS_AWAKEN)
1197
1198 static int nf_tables_updtable(struct nft_ctx *ctx)
1199 {
1200         struct nft_trans *trans;
1201         u32 flags;
1202         int ret;
1203
1204         if (!ctx->nla[NFTA_TABLE_FLAGS])
1205                 return 0;
1206
1207         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1208         if (flags & ~NFT_TABLE_F_MASK)
1209                 return -EOPNOTSUPP;
1210
1211         if (flags == ctx->table->flags)
1212                 return 0;
1213
1214         if ((nft_table_has_owner(ctx->table) &&
1215              !(flags & NFT_TABLE_F_OWNER)) ||
1216             (!nft_table_has_owner(ctx->table) &&
1217              flags & NFT_TABLE_F_OWNER))
1218                 return -EOPNOTSUPP;
1219
1220         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1221                                 sizeof(struct nft_trans_table));
1222         if (trans == NULL)
1223                 return -ENOMEM;
1224
1225         if ((flags & NFT_TABLE_F_DORMANT) &&
1226             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1227                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1228                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1229                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1230         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1231                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1232                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1233                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1234                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1235                         if (ret < 0)
1236                                 goto err_register_hooks;
1237
1238                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1239                 }
1240         }
1241
1242         nft_trans_table_update(trans) = true;
1243         nft_trans_commit_list_add_tail(ctx->net, trans);
1244
1245         return 0;
1246
1247 err_register_hooks:
1248         nft_trans_destroy(trans);
1249         return ret;
1250 }
1251
1252 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1253 {
1254         const char *name = data;
1255
1256         return jhash(name, strlen(name), seed);
1257 }
1258
1259 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1260 {
1261         const struct nft_chain *chain = data;
1262
1263         return nft_chain_hash(chain->name, 0, seed);
1264 }
1265
1266 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1267                               const void *ptr)
1268 {
1269         const struct nft_chain *chain = ptr;
1270         const char *name = arg->key;
1271
1272         return strcmp(chain->name, name);
1273 }
1274
1275 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1276 {
1277         const struct nft_object_hash_key *k = data;
1278
1279         seed ^= hash_ptr(k->table, 32);
1280
1281         return jhash(k->name, strlen(k->name), seed);
1282 }
1283
1284 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1285 {
1286         const struct nft_object *obj = data;
1287
1288         return nft_objname_hash(&obj->key, 0, seed);
1289 }
1290
1291 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1292                                 const void *ptr)
1293 {
1294         const struct nft_object_hash_key *k = arg->key;
1295         const struct nft_object *obj = ptr;
1296
1297         if (obj->key.table != k->table)
1298                 return -1;
1299
1300         return strcmp(obj->key.name, k->name);
1301 }
1302
1303 static bool nft_supported_family(u8 family)
1304 {
1305         return false
1306 #ifdef CONFIG_NF_TABLES_INET
1307                 || family == NFPROTO_INET
1308 #endif
1309 #ifdef CONFIG_NF_TABLES_IPV4
1310                 || family == NFPROTO_IPV4
1311 #endif
1312 #ifdef CONFIG_NF_TABLES_ARP
1313                 || family == NFPROTO_ARP
1314 #endif
1315 #ifdef CONFIG_NF_TABLES_NETDEV
1316                 || family == NFPROTO_NETDEV
1317 #endif
1318 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1319                 || family == NFPROTO_BRIDGE
1320 #endif
1321 #ifdef CONFIG_NF_TABLES_IPV6
1322                 || family == NFPROTO_IPV6
1323 #endif
1324                 ;
1325 }
1326
1327 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1328                               const struct nlattr * const nla[])
1329 {
1330         struct nftables_pernet *nft_net = nft_pernet(info->net);
1331         struct netlink_ext_ack *extack = info->extack;
1332         u8 genmask = nft_genmask_next(info->net);
1333         u8 family = info->nfmsg->nfgen_family;
1334         struct net *net = info->net;
1335         const struct nlattr *attr;
1336         struct nft_table *table;
1337         struct nft_ctx ctx;
1338         u32 flags = 0;
1339         int err;
1340
1341         if (!nft_supported_family(family))
1342                 return -EOPNOTSUPP;
1343
1344         lockdep_assert_held(&nft_net->commit_mutex);
1345         attr = nla[NFTA_TABLE_NAME];
1346         table = nft_table_lookup(net, attr, family, genmask,
1347                                  NETLINK_CB(skb).portid);
1348         if (IS_ERR(table)) {
1349                 if (PTR_ERR(table) != -ENOENT)
1350                         return PTR_ERR(table);
1351         } else {
1352                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1353                         NL_SET_BAD_ATTR(extack, attr);
1354                         return -EEXIST;
1355                 }
1356                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1357                         return -EOPNOTSUPP;
1358
1359                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1360
1361                 return nf_tables_updtable(&ctx);
1362         }
1363
1364         if (nla[NFTA_TABLE_FLAGS]) {
1365                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1366                 if (flags & ~NFT_TABLE_F_MASK)
1367                         return -EOPNOTSUPP;
1368         }
1369
1370         err = -ENOMEM;
1371         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1372         if (table == NULL)
1373                 goto err_kzalloc;
1374
1375         table->validate_state = NFT_VALIDATE_SKIP;
1376         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1377         if (table->name == NULL)
1378                 goto err_strdup;
1379
1380         if (nla[NFTA_TABLE_USERDATA]) {
1381                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1382                 if (table->udata == NULL)
1383                         goto err_table_udata;
1384
1385                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1386         }
1387
1388         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1389         if (err)
1390                 goto err_chain_ht;
1391
1392         INIT_LIST_HEAD(&table->chains);
1393         INIT_LIST_HEAD(&table->sets);
1394         INIT_LIST_HEAD(&table->objects);
1395         INIT_LIST_HEAD(&table->flowtables);
1396         table->family = family;
1397         table->flags = flags;
1398         table->handle = ++nft_net->table_handle;
1399         if (table->flags & NFT_TABLE_F_OWNER)
1400                 table->nlpid = NETLINK_CB(skb).portid;
1401
1402         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1403         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1404         if (err < 0)
1405                 goto err_trans;
1406
1407         list_add_tail_rcu(&table->list, &nft_net->tables);
1408         return 0;
1409 err_trans:
1410         rhltable_destroy(&table->chains_ht);
1411 err_chain_ht:
1412         kfree(table->udata);
1413 err_table_udata:
1414         kfree(table->name);
1415 err_strdup:
1416         kfree(table);
1417 err_kzalloc:
1418         return err;
1419 }
1420
1421 static int nft_flush_table(struct nft_ctx *ctx)
1422 {
1423         struct nft_flowtable *flowtable, *nft;
1424         struct nft_chain *chain, *nc;
1425         struct nft_object *obj, *ne;
1426         struct nft_set *set, *ns;
1427         int err;
1428
1429         list_for_each_entry(chain, &ctx->table->chains, list) {
1430                 if (!nft_is_active_next(ctx->net, chain))
1431                         continue;
1432
1433                 if (nft_chain_is_bound(chain))
1434                         continue;
1435
1436                 ctx->chain = chain;
1437
1438                 err = nft_delrule_by_chain(ctx);
1439                 if (err < 0)
1440                         goto out;
1441         }
1442
1443         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1444                 if (!nft_is_active_next(ctx->net, set))
1445                         continue;
1446
1447                 if (nft_set_is_anonymous(set) &&
1448                     !list_empty(&set->bindings))
1449                         continue;
1450
1451                 err = nft_delset(ctx, set);
1452                 if (err < 0)
1453                         goto out;
1454         }
1455
1456         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1457                 if (!nft_is_active_next(ctx->net, flowtable))
1458                         continue;
1459
1460                 err = nft_delflowtable(ctx, flowtable);
1461                 if (err < 0)
1462                         goto out;
1463         }
1464
1465         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1466                 if (!nft_is_active_next(ctx->net, obj))
1467                         continue;
1468
1469                 err = nft_delobj(ctx, obj);
1470                 if (err < 0)
1471                         goto out;
1472         }
1473
1474         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1475                 if (!nft_is_active_next(ctx->net, chain))
1476                         continue;
1477
1478                 if (nft_chain_is_bound(chain))
1479                         continue;
1480
1481                 ctx->chain = chain;
1482
1483                 err = nft_delchain(ctx);
1484                 if (err < 0)
1485                         goto out;
1486         }
1487
1488         err = nft_deltable(ctx);
1489 out:
1490         return err;
1491 }
1492
1493 static int nft_flush(struct nft_ctx *ctx, int family)
1494 {
1495         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1496         const struct nlattr * const *nla = ctx->nla;
1497         struct nft_table *table, *nt;
1498         int err = 0;
1499
1500         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1501                 if (family != AF_UNSPEC && table->family != family)
1502                         continue;
1503
1504                 ctx->family = table->family;
1505
1506                 if (!nft_is_active_next(ctx->net, table))
1507                         continue;
1508
1509                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1510                         continue;
1511
1512                 if (nla[NFTA_TABLE_NAME] &&
1513                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1514                         continue;
1515
1516                 ctx->table = table;
1517
1518                 err = nft_flush_table(ctx);
1519                 if (err < 0)
1520                         goto out;
1521         }
1522 out:
1523         return err;
1524 }
1525
1526 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1527                               const struct nlattr * const nla[])
1528 {
1529         struct netlink_ext_ack *extack = info->extack;
1530         u8 genmask = nft_genmask_next(info->net);
1531         u8 family = info->nfmsg->nfgen_family;
1532         struct net *net = info->net;
1533         const struct nlattr *attr;
1534         struct nft_table *table;
1535         struct nft_ctx ctx;
1536
1537         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1538         if (family == AF_UNSPEC ||
1539             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1540                 return nft_flush(&ctx, family);
1541
1542         if (nla[NFTA_TABLE_HANDLE]) {
1543                 attr = nla[NFTA_TABLE_HANDLE];
1544                 table = nft_table_lookup_byhandle(net, attr, genmask,
1545                                                   NETLINK_CB(skb).portid);
1546         } else {
1547                 attr = nla[NFTA_TABLE_NAME];
1548                 table = nft_table_lookup(net, attr, family, genmask,
1549                                          NETLINK_CB(skb).portid);
1550         }
1551
1552         if (IS_ERR(table)) {
1553                 if (PTR_ERR(table) == -ENOENT &&
1554                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1555                         return 0;
1556
1557                 NL_SET_BAD_ATTR(extack, attr);
1558                 return PTR_ERR(table);
1559         }
1560
1561         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1562             table->use > 0)
1563                 return -EBUSY;
1564
1565         ctx.family = family;
1566         ctx.table = table;
1567
1568         return nft_flush_table(&ctx);
1569 }
1570
1571 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1572 {
1573         if (WARN_ON(ctx->table->use > 0))
1574                 return;
1575
1576         rhltable_destroy(&ctx->table->chains_ht);
1577         kfree(ctx->table->name);
1578         kfree(ctx->table->udata);
1579         kfree(ctx->table);
1580 }
1581
1582 void nft_register_chain_type(const struct nft_chain_type *ctype)
1583 {
1584         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1585         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1586                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1587                 return;
1588         }
1589         chain_type[ctype->family][ctype->type] = ctype;
1590         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1591 }
1592 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1593
1594 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1595 {
1596         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1597         chain_type[ctype->family][ctype->type] = NULL;
1598         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1599 }
1600 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1601
1602 /*
1603  * Chains
1604  */
1605
1606 static struct nft_chain *
1607 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1608 {
1609         struct nft_chain *chain;
1610
1611         list_for_each_entry(chain, &table->chains, list) {
1612                 if (chain->handle == handle &&
1613                     nft_active_genmask(chain, genmask))
1614                         return chain;
1615         }
1616
1617         return ERR_PTR(-ENOENT);
1618 }
1619
1620 static bool lockdep_commit_lock_is_held(const struct net *net)
1621 {
1622 #ifdef CONFIG_PROVE_LOCKING
1623         struct nftables_pernet *nft_net = nft_pernet(net);
1624
1625         return lockdep_is_held(&nft_net->commit_mutex);
1626 #else
1627         return true;
1628 #endif
1629 }
1630
1631 static struct nft_chain *nft_chain_lookup(struct net *net,
1632                                           struct nft_table *table,
1633                                           const struct nlattr *nla, u8 genmask)
1634 {
1635         char search[NFT_CHAIN_MAXNAMELEN + 1];
1636         struct rhlist_head *tmp, *list;
1637         struct nft_chain *chain;
1638
1639         if (nla == NULL)
1640                 return ERR_PTR(-EINVAL);
1641
1642         nla_strscpy(search, nla, sizeof(search));
1643
1644         WARN_ON(!rcu_read_lock_held() &&
1645                 !lockdep_commit_lock_is_held(net));
1646
1647         chain = ERR_PTR(-ENOENT);
1648         rcu_read_lock();
1649         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1650         if (!list)
1651                 goto out_unlock;
1652
1653         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1654                 if (nft_active_genmask(chain, genmask))
1655                         goto out_unlock;
1656         }
1657         chain = ERR_PTR(-ENOENT);
1658 out_unlock:
1659         rcu_read_unlock();
1660         return chain;
1661 }
1662
1663 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1664         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1665                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1666         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1667         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1668                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1669         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1670         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1671         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1672                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1673         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1674         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1675         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1676         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1677                                     .len = NFT_USERDATA_MAXLEN },
1678 };
1679
1680 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1681         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1682         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1683         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1684                                     .len = IFNAMSIZ - 1 },
1685 };
1686
1687 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1688 {
1689         struct nft_stats *cpu_stats, total;
1690         struct nlattr *nest;
1691         unsigned int seq;
1692         u64 pkts, bytes;
1693         int cpu;
1694
1695         if (!stats)
1696                 return 0;
1697
1698         memset(&total, 0, sizeof(total));
1699         for_each_possible_cpu(cpu) {
1700                 cpu_stats = per_cpu_ptr(stats, cpu);
1701                 do {
1702                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1703                         pkts = cpu_stats->pkts;
1704                         bytes = cpu_stats->bytes;
1705                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1706                 total.pkts += pkts;
1707                 total.bytes += bytes;
1708         }
1709         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1710         if (nest == NULL)
1711                 goto nla_put_failure;
1712
1713         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1714                          NFTA_COUNTER_PAD) ||
1715             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1716                          NFTA_COUNTER_PAD))
1717                 goto nla_put_failure;
1718
1719         nla_nest_end(skb, nest);
1720         return 0;
1721
1722 nla_put_failure:
1723         return -ENOSPC;
1724 }
1725
1726 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1727                                    const struct nft_base_chain *basechain,
1728                                    const struct list_head *hook_list)
1729 {
1730         const struct nf_hook_ops *ops = &basechain->ops;
1731         struct nft_hook *hook, *first = NULL;
1732         struct nlattr *nest, *nest_devs;
1733         int n = 0;
1734
1735         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1736         if (nest == NULL)
1737                 goto nla_put_failure;
1738         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1739                 goto nla_put_failure;
1740         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1741                 goto nla_put_failure;
1742
1743         if (nft_base_chain_netdev(family, ops->hooknum)) {
1744                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1745                 if (!nest_devs)
1746                         goto nla_put_failure;
1747
1748                 if (!hook_list)
1749                         hook_list = &basechain->hook_list;
1750
1751                 list_for_each_entry(hook, hook_list, list) {
1752                         if (!first)
1753                                 first = hook;
1754
1755                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1756                                            hook->ops.dev->name))
1757                                 goto nla_put_failure;
1758                         n++;
1759                 }
1760                 nla_nest_end(skb, nest_devs);
1761
1762                 if (n == 1 &&
1763                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1764                         goto nla_put_failure;
1765         }
1766         nla_nest_end(skb, nest);
1767
1768         return 0;
1769 nla_put_failure:
1770         return -1;
1771 }
1772
1773 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1774                                      u32 portid, u32 seq, int event, u32 flags,
1775                                      int family, const struct nft_table *table,
1776                                      const struct nft_chain *chain,
1777                                      const struct list_head *hook_list)
1778 {
1779         struct nlmsghdr *nlh;
1780
1781         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1782         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1783                            NFNETLINK_V0, nft_base_seq(net));
1784         if (!nlh)
1785                 goto nla_put_failure;
1786
1787         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1788             nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1789             nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1790                          NFTA_CHAIN_PAD))
1791                 goto nla_put_failure;
1792
1793         if (event == NFT_MSG_DELCHAIN && !hook_list) {
1794                 nlmsg_end(skb, nlh);
1795                 return 0;
1796         }
1797
1798         if (nft_is_base_chain(chain)) {
1799                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1800                 struct nft_stats __percpu *stats;
1801
1802                 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1803                         goto nla_put_failure;
1804
1805                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1806                                  htonl(basechain->policy)))
1807                         goto nla_put_failure;
1808
1809                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1810                         goto nla_put_failure;
1811
1812                 stats = rcu_dereference_check(basechain->stats,
1813                                               lockdep_commit_lock_is_held(net));
1814                 if (nft_dump_stats(skb, stats))
1815                         goto nla_put_failure;
1816         }
1817
1818         if (chain->flags &&
1819             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1820                 goto nla_put_failure;
1821
1822         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1823                 goto nla_put_failure;
1824
1825         if (chain->udata &&
1826             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1827                 goto nla_put_failure;
1828
1829         nlmsg_end(skb, nlh);
1830         return 0;
1831
1832 nla_put_failure:
1833         nlmsg_trim(skb, nlh);
1834         return -1;
1835 }
1836
1837 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1838                                    const struct list_head *hook_list)
1839 {
1840         struct nftables_pernet *nft_net;
1841         struct sk_buff *skb;
1842         u16 flags = 0;
1843         int err;
1844
1845         if (!ctx->report &&
1846             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1847                 return;
1848
1849         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1850         if (skb == NULL)
1851                 goto err;
1852
1853         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1854                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1855
1856         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1857                                         event, flags, ctx->family, ctx->table,
1858                                         ctx->chain, hook_list);
1859         if (err < 0) {
1860                 kfree_skb(skb);
1861                 goto err;
1862         }
1863
1864         nft_net = nft_pernet(ctx->net);
1865         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1866         return;
1867 err:
1868         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1869 }
1870
1871 static int nf_tables_dump_chains(struct sk_buff *skb,
1872                                  struct netlink_callback *cb)
1873 {
1874         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1875         unsigned int idx = 0, s_idx = cb->args[0];
1876         struct net *net = sock_net(skb->sk);
1877         int family = nfmsg->nfgen_family;
1878         struct nftables_pernet *nft_net;
1879         const struct nft_table *table;
1880         const struct nft_chain *chain;
1881
1882         rcu_read_lock();
1883         nft_net = nft_pernet(net);
1884         cb->seq = READ_ONCE(nft_net->base_seq);
1885
1886         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1887                 if (family != NFPROTO_UNSPEC && family != table->family)
1888                         continue;
1889
1890                 list_for_each_entry_rcu(chain, &table->chains, list) {
1891                         if (idx < s_idx)
1892                                 goto cont;
1893                         if (idx > s_idx)
1894                                 memset(&cb->args[1], 0,
1895                                        sizeof(cb->args) - sizeof(cb->args[0]));
1896                         if (!nft_is_active(net, chain))
1897                                 continue;
1898                         if (nf_tables_fill_chain_info(skb, net,
1899                                                       NETLINK_CB(cb->skb).portid,
1900                                                       cb->nlh->nlmsg_seq,
1901                                                       NFT_MSG_NEWCHAIN,
1902                                                       NLM_F_MULTI,
1903                                                       table->family, table,
1904                                                       chain, NULL) < 0)
1905                                 goto done;
1906
1907                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1908 cont:
1909                         idx++;
1910                 }
1911         }
1912 done:
1913         rcu_read_unlock();
1914         cb->args[0] = idx;
1915         return skb->len;
1916 }
1917
1918 /* called with rcu_read_lock held */
1919 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1920                               const struct nlattr * const nla[])
1921 {
1922         struct netlink_ext_ack *extack = info->extack;
1923         u8 genmask = nft_genmask_cur(info->net);
1924         u8 family = info->nfmsg->nfgen_family;
1925         const struct nft_chain *chain;
1926         struct net *net = info->net;
1927         struct nft_table *table;
1928         struct sk_buff *skb2;
1929         int err;
1930
1931         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1932                 struct netlink_dump_control c = {
1933                         .dump = nf_tables_dump_chains,
1934                         .module = THIS_MODULE,
1935                 };
1936
1937                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1938         }
1939
1940         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1941         if (IS_ERR(table)) {
1942                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1943                 return PTR_ERR(table);
1944         }
1945
1946         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1947         if (IS_ERR(chain)) {
1948                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1949                 return PTR_ERR(chain);
1950         }
1951
1952         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1953         if (!skb2)
1954                 return -ENOMEM;
1955
1956         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1957                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1958                                         0, family, table, chain, NULL);
1959         if (err < 0)
1960                 goto err_fill_chain_info;
1961
1962         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1963
1964 err_fill_chain_info:
1965         kfree_skb(skb2);
1966         return err;
1967 }
1968
1969 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1970         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1971         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1972 };
1973
1974 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1975 {
1976         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1977         struct nft_stats __percpu *newstats;
1978         struct nft_stats *stats;
1979         int err;
1980
1981         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1982                                           nft_counter_policy, NULL);
1983         if (err < 0)
1984                 return ERR_PTR(err);
1985
1986         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1987                 return ERR_PTR(-EINVAL);
1988
1989         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1990         if (newstats == NULL)
1991                 return ERR_PTR(-ENOMEM);
1992
1993         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1994          * are not exposed to userspace.
1995          */
1996         preempt_disable();
1997         stats = this_cpu_ptr(newstats);
1998         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1999         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2000         preempt_enable();
2001
2002         return newstats;
2003 }
2004
2005 static void nft_chain_stats_replace(struct nft_trans *trans)
2006 {
2007         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2008
2009         if (!nft_trans_chain_stats(trans))
2010                 return;
2011
2012         nft_trans_chain_stats(trans) =
2013                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2014                                     lockdep_commit_lock_is_held(trans->ctx.net));
2015
2016         if (!nft_trans_chain_stats(trans))
2017                 static_branch_inc(&nft_counters_enabled);
2018 }
2019
2020 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2021 {
2022         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2023         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2024
2025         if (g0 != g1)
2026                 kvfree(g1);
2027         kvfree(g0);
2028
2029         /* should be NULL either via abort or via successful commit */
2030         WARN_ON_ONCE(chain->blob_next);
2031         kvfree(chain->blob_next);
2032 }
2033
2034 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2035 {
2036         struct nft_chain *chain = ctx->chain;
2037         struct nft_hook *hook, *next;
2038
2039         if (WARN_ON(chain->use > 0))
2040                 return;
2041
2042         /* no concurrent access possible anymore */
2043         nf_tables_chain_free_chain_rules(chain);
2044
2045         if (nft_is_base_chain(chain)) {
2046                 struct nft_base_chain *basechain = nft_base_chain(chain);
2047
2048                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2049                         list_for_each_entry_safe(hook, next,
2050                                                  &basechain->hook_list, list) {
2051                                 list_del_rcu(&hook->list);
2052                                 kfree_rcu(hook, rcu);
2053                         }
2054                 }
2055                 module_put(basechain->type->owner);
2056                 if (rcu_access_pointer(basechain->stats)) {
2057                         static_branch_dec(&nft_counters_enabled);
2058                         free_percpu(rcu_dereference_raw(basechain->stats));
2059                 }
2060                 kfree(chain->name);
2061                 kfree(chain->udata);
2062                 kfree(basechain);
2063         } else {
2064                 kfree(chain->name);
2065                 kfree(chain->udata);
2066                 kfree(chain);
2067         }
2068 }
2069
2070 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2071                                               const struct nlattr *attr)
2072 {
2073         struct net_device *dev;
2074         char ifname[IFNAMSIZ];
2075         struct nft_hook *hook;
2076         int err;
2077
2078         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2079         if (!hook) {
2080                 err = -ENOMEM;
2081                 goto err_hook_alloc;
2082         }
2083
2084         nla_strscpy(ifname, attr, IFNAMSIZ);
2085         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2086          * indirectly serializing all the other holders of the commit_mutex with
2087          * the rtnl_mutex.
2088          */
2089         dev = __dev_get_by_name(net, ifname);
2090         if (!dev) {
2091                 err = -ENOENT;
2092                 goto err_hook_dev;
2093         }
2094         hook->ops.dev = dev;
2095
2096         return hook;
2097
2098 err_hook_dev:
2099         kfree(hook);
2100 err_hook_alloc:
2101         return ERR_PTR(err);
2102 }
2103
2104 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2105                                            const struct nft_hook *this)
2106 {
2107         struct nft_hook *hook;
2108
2109         list_for_each_entry(hook, hook_list, list) {
2110                 if (this->ops.dev == hook->ops.dev)
2111                         return hook;
2112         }
2113
2114         return NULL;
2115 }
2116
2117 static int nf_tables_parse_netdev_hooks(struct net *net,
2118                                         const struct nlattr *attr,
2119                                         struct list_head *hook_list,
2120                                         struct netlink_ext_ack *extack)
2121 {
2122         struct nft_hook *hook, *next;
2123         const struct nlattr *tmp;
2124         int rem, n = 0, err;
2125
2126         nla_for_each_nested(tmp, attr, rem) {
2127                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2128                         err = -EINVAL;
2129                         goto err_hook;
2130                 }
2131
2132                 hook = nft_netdev_hook_alloc(net, tmp);
2133                 if (IS_ERR(hook)) {
2134                         NL_SET_BAD_ATTR(extack, tmp);
2135                         err = PTR_ERR(hook);
2136                         goto err_hook;
2137                 }
2138                 if (nft_hook_list_find(hook_list, hook)) {
2139                         NL_SET_BAD_ATTR(extack, tmp);
2140                         kfree(hook);
2141                         err = -EEXIST;
2142                         goto err_hook;
2143                 }
2144                 list_add_tail(&hook->list, hook_list);
2145                 n++;
2146
2147                 if (n == NFT_NETDEVICE_MAX) {
2148                         err = -EFBIG;
2149                         goto err_hook;
2150                 }
2151         }
2152
2153         return 0;
2154
2155 err_hook:
2156         list_for_each_entry_safe(hook, next, hook_list, list) {
2157                 list_del(&hook->list);
2158                 kfree(hook);
2159         }
2160         return err;
2161 }
2162
2163 struct nft_chain_hook {
2164         u32                             num;
2165         s32                             priority;
2166         const struct nft_chain_type     *type;
2167         struct list_head                list;
2168 };
2169
2170 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2171                                   struct list_head *hook_list,
2172                                   struct netlink_ext_ack *extack, u32 flags)
2173 {
2174         struct nft_hook *hook;
2175         int err;
2176
2177         if (tb[NFTA_HOOK_DEV]) {
2178                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2179                 if (IS_ERR(hook)) {
2180                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2181                         return PTR_ERR(hook);
2182                 }
2183
2184                 list_add_tail(&hook->list, hook_list);
2185         } else if (tb[NFTA_HOOK_DEVS]) {
2186                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2187                                                    hook_list, extack);
2188                 if (err < 0)
2189                         return err;
2190
2191         }
2192
2193         if (flags & NFT_CHAIN_HW_OFFLOAD &&
2194             list_empty(hook_list))
2195                 return -EINVAL;
2196
2197         return 0;
2198 }
2199
2200 static int nft_chain_parse_hook(struct net *net,
2201                                 struct nft_base_chain *basechain,
2202                                 const struct nlattr * const nla[],
2203                                 struct nft_chain_hook *hook, u8 family,
2204                                 u32 flags, struct netlink_ext_ack *extack)
2205 {
2206         struct nftables_pernet *nft_net = nft_pernet(net);
2207         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2208         const struct nft_chain_type *type;
2209         int err;
2210
2211         lockdep_assert_held(&nft_net->commit_mutex);
2212         lockdep_nfnl_nft_mutex_not_held();
2213
2214         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2215                                           nla[NFTA_CHAIN_HOOK],
2216                                           nft_hook_policy, NULL);
2217         if (err < 0)
2218                 return err;
2219
2220         if (!basechain) {
2221                 if (!ha[NFTA_HOOK_HOOKNUM] ||
2222                     !ha[NFTA_HOOK_PRIORITY]) {
2223                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2224                         return -ENOENT;
2225                 }
2226
2227                 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2228                 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2229
2230                 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2231                 if (!type)
2232                         return -EOPNOTSUPP;
2233
2234                 if (nla[NFTA_CHAIN_TYPE]) {
2235                         type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2236                                                            family, true);
2237                         if (IS_ERR(type)) {
2238                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2239                                 return PTR_ERR(type);
2240                         }
2241                 }
2242                 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2243                         return -EOPNOTSUPP;
2244
2245                 if (type->type == NFT_CHAIN_T_NAT &&
2246                     hook->priority <= NF_IP_PRI_CONNTRACK)
2247                         return -EOPNOTSUPP;
2248         } else {
2249                 if (ha[NFTA_HOOK_HOOKNUM]) {
2250                         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2251                         if (hook->num != basechain->ops.hooknum)
2252                                 return -EOPNOTSUPP;
2253                 }
2254                 if (ha[NFTA_HOOK_PRIORITY]) {
2255                         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2256                         if (hook->priority != basechain->ops.priority)
2257                                 return -EOPNOTSUPP;
2258                 }
2259
2260                 type = basechain->type;
2261         }
2262
2263         if (!try_module_get(type->owner)) {
2264                 if (nla[NFTA_CHAIN_TYPE])
2265                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2266                 return -ENOENT;
2267         }
2268
2269         hook->type = type;
2270
2271         INIT_LIST_HEAD(&hook->list);
2272         if (nft_base_chain_netdev(family, hook->num)) {
2273                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2274                 if (err < 0) {
2275                         module_put(type->owner);
2276                         return err;
2277                 }
2278         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2279                 module_put(type->owner);
2280                 return -EOPNOTSUPP;
2281         }
2282
2283         return 0;
2284 }
2285
2286 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2287 {
2288         struct nft_hook *h, *next;
2289
2290         list_for_each_entry_safe(h, next, &hook->list, list) {
2291                 list_del(&h->list);
2292                 kfree(h);
2293         }
2294         module_put(hook->type->owner);
2295 }
2296
2297 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2298 {
2299         struct nft_rule_dp_last *lrule;
2300
2301         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2302
2303         lrule = (struct nft_rule_dp_last *)ptr;
2304         lrule->end.is_last = 1;
2305         lrule->chain = chain;
2306         /* blob size does not include the trailer rule */
2307 }
2308
2309 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2310                                                          unsigned int size)
2311 {
2312         struct nft_rule_blob *blob;
2313
2314         if (size > INT_MAX)
2315                 return NULL;
2316
2317         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2318
2319         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2320         if (!blob)
2321                 return NULL;
2322
2323         blob->size = 0;
2324         nft_last_rule(chain, blob->data);
2325
2326         return blob;
2327 }
2328
2329 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2330                                     const struct nft_chain_hook *hook,
2331                                     struct nft_chain *chain)
2332 {
2333         ops->pf                 = family;
2334         ops->hooknum            = hook->num;
2335         ops->priority           = hook->priority;
2336         ops->priv               = chain;
2337         ops->hook               = hook->type->hooks[ops->hooknum];
2338         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2339 }
2340
2341 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2342                               struct nft_chain_hook *hook, u32 flags)
2343 {
2344         struct nft_chain *chain;
2345         struct nft_hook *h;
2346
2347         basechain->type = hook->type;
2348         INIT_LIST_HEAD(&basechain->hook_list);
2349         chain = &basechain->chain;
2350
2351         if (nft_base_chain_netdev(family, hook->num)) {
2352                 list_splice_init(&hook->list, &basechain->hook_list);
2353                 list_for_each_entry(h, &basechain->hook_list, list)
2354                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2355         }
2356         nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2357
2358         chain->flags |= NFT_CHAIN_BASE | flags;
2359         basechain->policy = NF_ACCEPT;
2360         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2361             !nft_chain_offload_support(basechain)) {
2362                 list_splice_init(&basechain->hook_list, &hook->list);
2363                 return -EOPNOTSUPP;
2364         }
2365
2366         flow_block_init(&basechain->flow_block);
2367
2368         return 0;
2369 }
2370
2371 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2372 {
2373         int err;
2374
2375         err = rhltable_insert_key(&table->chains_ht, chain->name,
2376                                   &chain->rhlhead, nft_chain_ht_params);
2377         if (err)
2378                 return err;
2379
2380         list_add_tail_rcu(&chain->list, &table->chains);
2381
2382         return 0;
2383 }
2384
2385 static u64 chain_id;
2386
2387 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2388                               u8 policy, u32 flags,
2389                               struct netlink_ext_ack *extack)
2390 {
2391         const struct nlattr * const *nla = ctx->nla;
2392         struct nft_table *table = ctx->table;
2393         struct nft_base_chain *basechain;
2394         struct net *net = ctx->net;
2395         char name[NFT_NAME_MAXLEN];
2396         struct nft_rule_blob *blob;
2397         struct nft_trans *trans;
2398         struct nft_chain *chain;
2399         int err;
2400
2401         if (nla[NFTA_CHAIN_HOOK]) {
2402                 struct nft_stats __percpu *stats = NULL;
2403                 struct nft_chain_hook hook = {};
2404
2405                 if (flags & NFT_CHAIN_BINDING)
2406                         return -EOPNOTSUPP;
2407
2408                 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2409                                            extack);
2410                 if (err < 0)
2411                         return err;
2412
2413                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2414                 if (basechain == NULL) {
2415                         nft_chain_release_hook(&hook);
2416                         return -ENOMEM;
2417                 }
2418                 chain = &basechain->chain;
2419
2420                 if (nla[NFTA_CHAIN_COUNTERS]) {
2421                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2422                         if (IS_ERR(stats)) {
2423                                 nft_chain_release_hook(&hook);
2424                                 kfree(basechain);
2425                                 return PTR_ERR(stats);
2426                         }
2427                         rcu_assign_pointer(basechain->stats, stats);
2428                 }
2429
2430                 err = nft_basechain_init(basechain, family, &hook, flags);
2431                 if (err < 0) {
2432                         nft_chain_release_hook(&hook);
2433                         kfree(basechain);
2434                         free_percpu(stats);
2435                         return err;
2436                 }
2437                 if (stats)
2438                         static_branch_inc(&nft_counters_enabled);
2439         } else {
2440                 if (flags & NFT_CHAIN_BASE)
2441                         return -EINVAL;
2442                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2443                         return -EOPNOTSUPP;
2444
2445                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2446                 if (chain == NULL)
2447                         return -ENOMEM;
2448
2449                 chain->flags = flags;
2450         }
2451         ctx->chain = chain;
2452
2453         INIT_LIST_HEAD(&chain->rules);
2454         chain->handle = nf_tables_alloc_handle(table);
2455         chain->table = table;
2456
2457         if (nla[NFTA_CHAIN_NAME]) {
2458                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2459         } else {
2460                 if (!(flags & NFT_CHAIN_BINDING)) {
2461                         err = -EINVAL;
2462                         goto err_destroy_chain;
2463                 }
2464
2465                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2466                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2467         }
2468
2469         if (!chain->name) {
2470                 err = -ENOMEM;
2471                 goto err_destroy_chain;
2472         }
2473
2474         if (nla[NFTA_CHAIN_USERDATA]) {
2475                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2476                 if (chain->udata == NULL) {
2477                         err = -ENOMEM;
2478                         goto err_destroy_chain;
2479                 }
2480                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2481         }
2482
2483         blob = nf_tables_chain_alloc_rules(chain, 0);
2484         if (!blob) {
2485                 err = -ENOMEM;
2486                 goto err_destroy_chain;
2487         }
2488
2489         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2490         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2491
2492         err = nf_tables_register_hook(net, table, chain);
2493         if (err < 0)
2494                 goto err_destroy_chain;
2495
2496         if (!nft_use_inc(&table->use)) {
2497                 err = -EMFILE;
2498                 goto err_use;
2499         }
2500
2501         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2502         if (IS_ERR(trans)) {
2503                 err = PTR_ERR(trans);
2504                 goto err_unregister_hook;
2505         }
2506
2507         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2508         if (nft_is_base_chain(chain))
2509                 nft_trans_chain_policy(trans) = policy;
2510
2511         err = nft_chain_add(table, chain);
2512         if (err < 0) {
2513                 nft_trans_destroy(trans);
2514                 goto err_unregister_hook;
2515         }
2516
2517         return 0;
2518
2519 err_unregister_hook:
2520         nft_use_dec_restore(&table->use);
2521 err_use:
2522         nf_tables_unregister_hook(net, table, chain);
2523 err_destroy_chain:
2524         nf_tables_chain_destroy(ctx);
2525
2526         return err;
2527 }
2528
2529 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2530                               u32 flags, const struct nlattr *attr,
2531                               struct netlink_ext_ack *extack)
2532 {
2533         const struct nlattr * const *nla = ctx->nla;
2534         struct nft_base_chain *basechain = NULL;
2535         struct nft_table *table = ctx->table;
2536         struct nft_chain *chain = ctx->chain;
2537         struct nft_chain_hook hook = {};
2538         struct nft_stats *stats = NULL;
2539         struct nft_hook *h, *next;
2540         struct nf_hook_ops *ops;
2541         struct nft_trans *trans;
2542         bool unregister = false;
2543         int err;
2544
2545         if (chain->flags ^ flags)
2546                 return -EOPNOTSUPP;
2547
2548         INIT_LIST_HEAD(&hook.list);
2549
2550         if (nla[NFTA_CHAIN_HOOK]) {
2551                 if (!nft_is_base_chain(chain)) {
2552                         NL_SET_BAD_ATTR(extack, attr);
2553                         return -EEXIST;
2554                 }
2555
2556                 basechain = nft_base_chain(chain);
2557                 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2558                                            ctx->family, flags, extack);
2559                 if (err < 0)
2560                         return err;
2561
2562                 if (basechain->type != hook.type) {
2563                         nft_chain_release_hook(&hook);
2564                         NL_SET_BAD_ATTR(extack, attr);
2565                         return -EEXIST;
2566                 }
2567
2568                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2569                         list_for_each_entry_safe(h, next, &hook.list, list) {
2570                                 h->ops.pf       = basechain->ops.pf;
2571                                 h->ops.hooknum  = basechain->ops.hooknum;
2572                                 h->ops.priority = basechain->ops.priority;
2573                                 h->ops.priv     = basechain->ops.priv;
2574                                 h->ops.hook     = basechain->ops.hook;
2575
2576                                 if (nft_hook_list_find(&basechain->hook_list, h)) {
2577                                         list_del(&h->list);
2578                                         kfree(h);
2579                                 }
2580                         }
2581                 } else {
2582                         ops = &basechain->ops;
2583                         if (ops->hooknum != hook.num ||
2584                             ops->priority != hook.priority) {
2585                                 nft_chain_release_hook(&hook);
2586                                 NL_SET_BAD_ATTR(extack, attr);
2587                                 return -EEXIST;
2588                         }
2589                 }
2590         }
2591
2592         if (nla[NFTA_CHAIN_HANDLE] &&
2593             nla[NFTA_CHAIN_NAME]) {
2594                 struct nft_chain *chain2;
2595
2596                 chain2 = nft_chain_lookup(ctx->net, table,
2597                                           nla[NFTA_CHAIN_NAME], genmask);
2598                 if (!IS_ERR(chain2)) {
2599                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2600                         err = -EEXIST;
2601                         goto err_hooks;
2602                 }
2603         }
2604
2605         if (nla[NFTA_CHAIN_COUNTERS]) {
2606                 if (!nft_is_base_chain(chain)) {
2607                         err = -EOPNOTSUPP;
2608                         goto err_hooks;
2609                 }
2610
2611                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2612                 if (IS_ERR(stats)) {
2613                         err = PTR_ERR(stats);
2614                         goto err_hooks;
2615                 }
2616         }
2617
2618         if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2619             nft_is_base_chain(chain) &&
2620             !list_empty(&hook.list)) {
2621                 basechain = nft_base_chain(chain);
2622                 ops = &basechain->ops;
2623
2624                 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2625                         err = nft_netdev_register_hooks(ctx->net, &hook.list);
2626                         if (err < 0)
2627                                 goto err_hooks;
2628                 }
2629         }
2630
2631         unregister = true;
2632         err = -ENOMEM;
2633         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2634                                 sizeof(struct nft_trans_chain));
2635         if (trans == NULL)
2636                 goto err_trans;
2637
2638         nft_trans_chain_stats(trans) = stats;
2639         nft_trans_chain_update(trans) = true;
2640
2641         if (nla[NFTA_CHAIN_POLICY])
2642                 nft_trans_chain_policy(trans) = policy;
2643         else
2644                 nft_trans_chain_policy(trans) = -1;
2645
2646         if (nla[NFTA_CHAIN_HANDLE] &&
2647             nla[NFTA_CHAIN_NAME]) {
2648                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2649                 struct nft_trans *tmp;
2650                 char *name;
2651
2652                 err = -ENOMEM;
2653                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2654                 if (!name)
2655                         goto err_trans;
2656
2657                 err = -EEXIST;
2658                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2659                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2660                             tmp->ctx.table == table &&
2661                             nft_trans_chain_update(tmp) &&
2662                             nft_trans_chain_name(tmp) &&
2663                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2664                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2665                                 kfree(name);
2666                                 goto err_trans;
2667                         }
2668                 }
2669
2670                 nft_trans_chain_name(trans) = name;
2671         }
2672
2673         nft_trans_basechain(trans) = basechain;
2674         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2675         list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2676         if (nla[NFTA_CHAIN_HOOK])
2677                 module_put(hook.type->owner);
2678
2679         nft_trans_commit_list_add_tail(ctx->net, trans);
2680
2681         return 0;
2682
2683 err_trans:
2684         free_percpu(stats);
2685         kfree(trans);
2686 err_hooks:
2687         if (nla[NFTA_CHAIN_HOOK]) {
2688                 list_for_each_entry_safe(h, next, &hook.list, list) {
2689                         if (unregister)
2690                                 nf_unregister_net_hook(ctx->net, &h->ops);
2691                         list_del(&h->list);
2692                         kfree_rcu(h, rcu);
2693                 }
2694                 module_put(hook.type->owner);
2695         }
2696
2697         return err;
2698 }
2699
2700 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2701                                                const struct nft_table *table,
2702                                                const struct nlattr *nla, u8 genmask)
2703 {
2704         struct nftables_pernet *nft_net = nft_pernet(net);
2705         u32 id = ntohl(nla_get_be32(nla));
2706         struct nft_trans *trans;
2707
2708         list_for_each_entry(trans, &nft_net->commit_list, list) {
2709                 struct nft_chain *chain = trans->ctx.chain;
2710
2711                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2712                     chain->table == table &&
2713                     id == nft_trans_chain_id(trans) &&
2714                     nft_active_genmask(chain, genmask))
2715                         return chain;
2716         }
2717         return ERR_PTR(-ENOENT);
2718 }
2719
2720 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2721                               const struct nlattr * const nla[])
2722 {
2723         struct nftables_pernet *nft_net = nft_pernet(info->net);
2724         struct netlink_ext_ack *extack = info->extack;
2725         u8 genmask = nft_genmask_next(info->net);
2726         u8 family = info->nfmsg->nfgen_family;
2727         struct nft_chain *chain = NULL;
2728         struct net *net = info->net;
2729         const struct nlattr *attr;
2730         struct nft_table *table;
2731         u8 policy = NF_ACCEPT;
2732         struct nft_ctx ctx;
2733         u64 handle = 0;
2734         u32 flags = 0;
2735
2736         lockdep_assert_held(&nft_net->commit_mutex);
2737
2738         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2739                                  NETLINK_CB(skb).portid);
2740         if (IS_ERR(table)) {
2741                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2742                 return PTR_ERR(table);
2743         }
2744
2745         chain = NULL;
2746         attr = nla[NFTA_CHAIN_NAME];
2747
2748         if (nla[NFTA_CHAIN_HANDLE]) {
2749                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2750                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2751                 if (IS_ERR(chain)) {
2752                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2753                         return PTR_ERR(chain);
2754                 }
2755                 attr = nla[NFTA_CHAIN_HANDLE];
2756         } else if (nla[NFTA_CHAIN_NAME]) {
2757                 chain = nft_chain_lookup(net, table, attr, genmask);
2758                 if (IS_ERR(chain)) {
2759                         if (PTR_ERR(chain) != -ENOENT) {
2760                                 NL_SET_BAD_ATTR(extack, attr);
2761                                 return PTR_ERR(chain);
2762                         }
2763                         chain = NULL;
2764                 }
2765         } else if (!nla[NFTA_CHAIN_ID]) {
2766                 return -EINVAL;
2767         }
2768
2769         if (nla[NFTA_CHAIN_POLICY]) {
2770                 if (chain != NULL &&
2771                     !nft_is_base_chain(chain)) {
2772                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2773                         return -EOPNOTSUPP;
2774                 }
2775
2776                 if (chain == NULL &&
2777                     nla[NFTA_CHAIN_HOOK] == NULL) {
2778                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2779                         return -EOPNOTSUPP;
2780                 }
2781
2782                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2783                 switch (policy) {
2784                 case NF_DROP:
2785                 case NF_ACCEPT:
2786                         break;
2787                 default:
2788                         return -EINVAL;
2789                 }
2790         }
2791
2792         if (nla[NFTA_CHAIN_FLAGS])
2793                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2794         else if (chain)
2795                 flags = chain->flags;
2796
2797         if (flags & ~NFT_CHAIN_FLAGS)
2798                 return -EOPNOTSUPP;
2799
2800         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2801
2802         if (chain != NULL) {
2803                 if (chain->flags & NFT_CHAIN_BINDING)
2804                         return -EINVAL;
2805
2806                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2807                         NL_SET_BAD_ATTR(extack, attr);
2808                         return -EEXIST;
2809                 }
2810                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2811                         return -EOPNOTSUPP;
2812
2813                 flags |= chain->flags & NFT_CHAIN_BASE;
2814                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2815                                           extack);
2816         }
2817
2818         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2819 }
2820
2821 static int nft_delchain_hook(struct nft_ctx *ctx,
2822                              struct nft_base_chain *basechain,
2823                              struct netlink_ext_ack *extack)
2824 {
2825         const struct nft_chain *chain = &basechain->chain;
2826         const struct nlattr * const *nla = ctx->nla;
2827         struct nft_chain_hook chain_hook = {};
2828         struct nft_hook *this, *hook;
2829         LIST_HEAD(chain_del_list);
2830         struct nft_trans *trans;
2831         int err;
2832
2833         err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2834                                    ctx->family, chain->flags, extack);
2835         if (err < 0)
2836                 return err;
2837
2838         list_for_each_entry(this, &chain_hook.list, list) {
2839                 hook = nft_hook_list_find(&basechain->hook_list, this);
2840                 if (!hook) {
2841                         err = -ENOENT;
2842                         goto err_chain_del_hook;
2843                 }
2844                 list_move(&hook->list, &chain_del_list);
2845         }
2846
2847         trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2848                                 sizeof(struct nft_trans_chain));
2849         if (!trans) {
2850                 err = -ENOMEM;
2851                 goto err_chain_del_hook;
2852         }
2853
2854         nft_trans_basechain(trans) = basechain;
2855         nft_trans_chain_update(trans) = true;
2856         INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2857         list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2858         nft_chain_release_hook(&chain_hook);
2859
2860         nft_trans_commit_list_add_tail(ctx->net, trans);
2861
2862         return 0;
2863
2864 err_chain_del_hook:
2865         list_splice(&chain_del_list, &basechain->hook_list);
2866         nft_chain_release_hook(&chain_hook);
2867
2868         return err;
2869 }
2870
2871 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2872                               const struct nlattr * const nla[])
2873 {
2874         struct netlink_ext_ack *extack = info->extack;
2875         u8 genmask = nft_genmask_next(info->net);
2876         u8 family = info->nfmsg->nfgen_family;
2877         struct net *net = info->net;
2878         const struct nlattr *attr;
2879         struct nft_table *table;
2880         struct nft_chain *chain;
2881         struct nft_rule *rule;
2882         struct nft_ctx ctx;
2883         u64 handle;
2884         u32 use;
2885         int err;
2886
2887         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2888                                  NETLINK_CB(skb).portid);
2889         if (IS_ERR(table)) {
2890                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2891                 return PTR_ERR(table);
2892         }
2893
2894         if (nla[NFTA_CHAIN_HANDLE]) {
2895                 attr = nla[NFTA_CHAIN_HANDLE];
2896                 handle = be64_to_cpu(nla_get_be64(attr));
2897                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2898         } else {
2899                 attr = nla[NFTA_CHAIN_NAME];
2900                 chain = nft_chain_lookup(net, table, attr, genmask);
2901         }
2902         if (IS_ERR(chain)) {
2903                 if (PTR_ERR(chain) == -ENOENT &&
2904                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2905                         return 0;
2906
2907                 NL_SET_BAD_ATTR(extack, attr);
2908                 return PTR_ERR(chain);
2909         }
2910
2911         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2912
2913         if (nla[NFTA_CHAIN_HOOK]) {
2914                 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2915                         return -EOPNOTSUPP;
2916
2917                 if (nft_is_base_chain(chain)) {
2918                         struct nft_base_chain *basechain = nft_base_chain(chain);
2919
2920                         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2921                                 return nft_delchain_hook(&ctx, basechain, extack);
2922                 }
2923         }
2924
2925         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2926             chain->use > 0)
2927                 return -EBUSY;
2928
2929         use = chain->use;
2930         list_for_each_entry(rule, &chain->rules, list) {
2931                 if (!nft_is_active_next(net, rule))
2932                         continue;
2933                 use--;
2934
2935                 err = nft_delrule(&ctx, rule);
2936                 if (err < 0)
2937                         return err;
2938         }
2939
2940         /* There are rules and elements that are still holding references to us,
2941          * we cannot do a recursive removal in this case.
2942          */
2943         if (use > 0) {
2944                 NL_SET_BAD_ATTR(extack, attr);
2945                 return -EBUSY;
2946         }
2947
2948         return nft_delchain(&ctx);
2949 }
2950
2951 /*
2952  * Expressions
2953  */
2954
2955 /**
2956  *      nft_register_expr - register nf_tables expr type
2957  *      @type: expr type
2958  *
2959  *      Registers the expr type for use with nf_tables. Returns zero on
2960  *      success or a negative errno code otherwise.
2961  */
2962 int nft_register_expr(struct nft_expr_type *type)
2963 {
2964         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2965         if (type->family == NFPROTO_UNSPEC)
2966                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2967         else
2968                 list_add_rcu(&type->list, &nf_tables_expressions);
2969         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2970         return 0;
2971 }
2972 EXPORT_SYMBOL_GPL(nft_register_expr);
2973
2974 /**
2975  *      nft_unregister_expr - unregister nf_tables expr type
2976  *      @type: expr type
2977  *
2978  *      Unregisters the expr typefor use with nf_tables.
2979  */
2980 void nft_unregister_expr(struct nft_expr_type *type)
2981 {
2982         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2983         list_del_rcu(&type->list);
2984         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2985 }
2986 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2987
2988 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2989                                                        struct nlattr *nla)
2990 {
2991         const struct nft_expr_type *type, *candidate = NULL;
2992
2993         list_for_each_entry(type, &nf_tables_expressions, list) {
2994                 if (!nla_strcmp(nla, type->name)) {
2995                         if (!type->family && !candidate)
2996                                 candidate = type;
2997                         else if (type->family == family)
2998                                 candidate = type;
2999                 }
3000         }
3001         return candidate;
3002 }
3003
3004 #ifdef CONFIG_MODULES
3005 static int nft_expr_type_request_module(struct net *net, u8 family,
3006                                         struct nlattr *nla)
3007 {
3008         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3009                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3010                 return -EAGAIN;
3011
3012         return 0;
3013 }
3014 #endif
3015
3016 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3017                                                      u8 family,
3018                                                      struct nlattr *nla)
3019 {
3020         const struct nft_expr_type *type;
3021
3022         if (nla == NULL)
3023                 return ERR_PTR(-EINVAL);
3024
3025         type = __nft_expr_type_get(family, nla);
3026         if (type != NULL && try_module_get(type->owner))
3027                 return type;
3028
3029         lockdep_nfnl_nft_mutex_not_held();
3030 #ifdef CONFIG_MODULES
3031         if (type == NULL) {
3032                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3033                         return ERR_PTR(-EAGAIN);
3034
3035                 if (nft_request_module(net, "nft-expr-%.*s",
3036                                        nla_len(nla),
3037                                        (char *)nla_data(nla)) == -EAGAIN)
3038                         return ERR_PTR(-EAGAIN);
3039         }
3040 #endif
3041         return ERR_PTR(-ENOENT);
3042 }
3043
3044 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3045         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
3046                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
3047         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
3048 };
3049
3050 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3051                                     const struct nft_expr *expr, bool reset)
3052 {
3053         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3054                 goto nla_put_failure;
3055
3056         if (expr->ops->dump) {
3057                 struct nlattr *data = nla_nest_start_noflag(skb,
3058                                                             NFTA_EXPR_DATA);
3059                 if (data == NULL)
3060                         goto nla_put_failure;
3061                 if (expr->ops->dump(skb, expr, reset) < 0)
3062                         goto nla_put_failure;
3063                 nla_nest_end(skb, data);
3064         }
3065
3066         return skb->len;
3067
3068 nla_put_failure:
3069         return -1;
3070 };
3071
3072 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3073                   const struct nft_expr *expr, bool reset)
3074 {
3075         struct nlattr *nest;
3076
3077         nest = nla_nest_start_noflag(skb, attr);
3078         if (!nest)
3079                 goto nla_put_failure;
3080         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3081                 goto nla_put_failure;
3082         nla_nest_end(skb, nest);
3083         return 0;
3084
3085 nla_put_failure:
3086         return -1;
3087 }
3088
3089 struct nft_expr_info {
3090         const struct nft_expr_ops       *ops;
3091         const struct nlattr             *attr;
3092         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
3093 };
3094
3095 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3096                                 const struct nlattr *nla,
3097                                 struct nft_expr_info *info)
3098 {
3099         const struct nft_expr_type *type;
3100         const struct nft_expr_ops *ops;
3101         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3102         int err;
3103
3104         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3105                                           nft_expr_policy, NULL);
3106         if (err < 0)
3107                 return err;
3108
3109         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3110         if (IS_ERR(type))
3111                 return PTR_ERR(type);
3112
3113         if (tb[NFTA_EXPR_DATA]) {
3114                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3115                                                   tb[NFTA_EXPR_DATA],
3116                                                   type->policy, NULL);
3117                 if (err < 0)
3118                         goto err1;
3119         } else
3120                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3121
3122         if (type->select_ops != NULL) {
3123                 ops = type->select_ops(ctx,
3124                                        (const struct nlattr * const *)info->tb);
3125                 if (IS_ERR(ops)) {
3126                         err = PTR_ERR(ops);
3127 #ifdef CONFIG_MODULES
3128                         if (err == -EAGAIN)
3129                                 if (nft_expr_type_request_module(ctx->net,
3130                                                                  ctx->family,
3131                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
3132                                         err = -ENOENT;
3133 #endif
3134                         goto err1;
3135                 }
3136         } else
3137                 ops = type->ops;
3138
3139         info->attr = nla;
3140         info->ops = ops;
3141
3142         return 0;
3143
3144 err1:
3145         module_put(type->owner);
3146         return err;
3147 }
3148
3149 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3150                          struct nft_expr_info *info)
3151 {
3152         struct nlattr *tb[NFTA_EXPR_MAX + 1];
3153         const struct nft_expr_type *type;
3154         int err;
3155
3156         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3157                                           nft_expr_policy, NULL);
3158         if (err < 0)
3159                 return err;
3160
3161         if (!tb[NFTA_EXPR_DATA])
3162                 return -EINVAL;
3163
3164         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3165         if (!type)
3166                 return -ENOENT;
3167
3168         if (!type->inner_ops)
3169                 return -EOPNOTSUPP;
3170
3171         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3172                                           tb[NFTA_EXPR_DATA],
3173                                           type->policy, NULL);
3174         if (err < 0)
3175                 goto err_nla_parse;
3176
3177         info->attr = nla;
3178         info->ops = type->inner_ops;
3179
3180         return 0;
3181
3182 err_nla_parse:
3183         return err;
3184 }
3185
3186 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3187                              const struct nft_expr_info *expr_info,
3188                              struct nft_expr *expr)
3189 {
3190         const struct nft_expr_ops *ops = expr_info->ops;
3191         int err;
3192
3193         expr->ops = ops;
3194         if (ops->init) {
3195                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3196                 if (err < 0)
3197                         goto err1;
3198         }
3199
3200         return 0;
3201 err1:
3202         expr->ops = NULL;
3203         return err;
3204 }
3205
3206 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3207                                    struct nft_expr *expr)
3208 {
3209         const struct nft_expr_type *type = expr->ops->type;
3210
3211         if (expr->ops->destroy)
3212                 expr->ops->destroy(ctx, expr);
3213         module_put(type->owner);
3214 }
3215
3216 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3217                                       const struct nlattr *nla)
3218 {
3219         struct nft_expr_info expr_info;
3220         struct nft_expr *expr;
3221         struct module *owner;
3222         int err;
3223
3224         err = nf_tables_expr_parse(ctx, nla, &expr_info);
3225         if (err < 0)
3226                 goto err_expr_parse;
3227
3228         err = -EOPNOTSUPP;
3229         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3230                 goto err_expr_stateful;
3231
3232         err = -ENOMEM;
3233         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3234         if (expr == NULL)
3235                 goto err_expr_stateful;
3236
3237         err = nf_tables_newexpr(ctx, &expr_info, expr);
3238         if (err < 0)
3239                 goto err_expr_new;
3240
3241         return expr;
3242 err_expr_new:
3243         kfree(expr);
3244 err_expr_stateful:
3245         owner = expr_info.ops->type->owner;
3246         if (expr_info.ops->type->release_ops)
3247                 expr_info.ops->type->release_ops(expr_info.ops);
3248
3249         module_put(owner);
3250 err_expr_parse:
3251         return ERR_PTR(err);
3252 }
3253
3254 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3255 {
3256         int err;
3257
3258         if (src->ops->clone) {
3259                 dst->ops = src->ops;
3260                 err = src->ops->clone(dst, src);
3261                 if (err < 0)
3262                         return err;
3263         } else {
3264                 memcpy(dst, src, src->ops->size);
3265         }
3266
3267         __module_get(src->ops->type->owner);
3268
3269         return 0;
3270 }
3271
3272 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3273 {
3274         nf_tables_expr_destroy(ctx, expr);
3275         kfree(expr);
3276 }
3277
3278 /*
3279  * Rules
3280  */
3281
3282 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3283                                           u64 handle)
3284 {
3285         struct nft_rule *rule;
3286
3287         // FIXME: this sucks
3288         list_for_each_entry_rcu(rule, &chain->rules, list) {
3289                 if (handle == rule->handle)
3290                         return rule;
3291         }
3292
3293         return ERR_PTR(-ENOENT);
3294 }
3295
3296 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3297                                         const struct nlattr *nla)
3298 {
3299         if (nla == NULL)
3300                 return ERR_PTR(-EINVAL);
3301
3302         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3303 }
3304
3305 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3306         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3307                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3308         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3309                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3310         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3311         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3312         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3313         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3314         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3315                                     .len = NFT_USERDATA_MAXLEN },
3316         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3317         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3318         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3319 };
3320
3321 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3322                                     u32 portid, u32 seq, int event,
3323                                     u32 flags, int family,
3324                                     const struct nft_table *table,
3325                                     const struct nft_chain *chain,
3326                                     const struct nft_rule *rule, u64 handle,
3327                                     bool reset)
3328 {
3329         struct nlmsghdr *nlh;
3330         const struct nft_expr *expr, *next;
3331         struct nlattr *list;
3332         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3333
3334         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3335                            nft_base_seq(net));
3336         if (!nlh)
3337                 goto nla_put_failure;
3338
3339         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3340                 goto nla_put_failure;
3341         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3342                 goto nla_put_failure;
3343         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3344                          NFTA_RULE_PAD))
3345                 goto nla_put_failure;
3346
3347         if (event != NFT_MSG_DELRULE && handle) {
3348                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3349                                  NFTA_RULE_PAD))
3350                         goto nla_put_failure;
3351         }
3352
3353         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3354                 nft_flow_rule_stats(chain, rule);
3355
3356         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3357         if (list == NULL)
3358                 goto nla_put_failure;
3359         nft_rule_for_each_expr(expr, next, rule) {
3360                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3361                         goto nla_put_failure;
3362         }
3363         nla_nest_end(skb, list);
3364
3365         if (rule->udata) {
3366                 struct nft_userdata *udata = nft_userdata(rule);
3367                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3368                             udata->data) < 0)
3369                         goto nla_put_failure;
3370         }
3371
3372         nlmsg_end(skb, nlh);
3373         return 0;
3374
3375 nla_put_failure:
3376         nlmsg_trim(skb, nlh);
3377         return -1;
3378 }
3379
3380 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3381                                   const struct nft_rule *rule, int event)
3382 {
3383         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3384         const struct nft_rule *prule;
3385         struct sk_buff *skb;
3386         u64 handle = 0;
3387         u16 flags = 0;
3388         int err;
3389
3390         if (!ctx->report &&
3391             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3392                 return;
3393
3394         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3395         if (skb == NULL)
3396                 goto err;
3397
3398         if (event == NFT_MSG_NEWRULE &&
3399             !list_is_first(&rule->list, &ctx->chain->rules) &&
3400             !list_is_last(&rule->list, &ctx->chain->rules)) {
3401                 prule = list_prev_entry(rule, list);
3402                 handle = prule->handle;
3403         }
3404         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3405                 flags |= NLM_F_APPEND;
3406         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3407                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3408
3409         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3410                                        event, flags, ctx->family, ctx->table,
3411                                        ctx->chain, rule, handle, false);
3412         if (err < 0) {
3413                 kfree_skb(skb);
3414                 goto err;
3415         }
3416
3417         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3418         return;
3419 err:
3420         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3421 }
3422
3423 struct nft_rule_dump_ctx {
3424         char *table;
3425         char *chain;
3426 };
3427
3428 static int __nf_tables_dump_rules(struct sk_buff *skb,
3429                                   unsigned int *idx,
3430                                   struct netlink_callback *cb,
3431                                   const struct nft_table *table,
3432                                   const struct nft_chain *chain,
3433                                   bool reset)
3434 {
3435         struct net *net = sock_net(skb->sk);
3436         const struct nft_rule *rule, *prule;
3437         unsigned int s_idx = cb->args[0];
3438         u64 handle;
3439
3440         prule = NULL;
3441         list_for_each_entry_rcu(rule, &chain->rules, list) {
3442                 if (!nft_is_active(net, rule))
3443                         goto cont_skip;
3444                 if (*idx < s_idx)
3445                         goto cont;
3446                 if (*idx > s_idx) {
3447                         memset(&cb->args[1], 0,
3448                                         sizeof(cb->args) - sizeof(cb->args[0]));
3449                 }
3450                 if (prule)
3451                         handle = prule->handle;
3452                 else
3453                         handle = 0;
3454
3455                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3456                                         cb->nlh->nlmsg_seq,
3457                                         NFT_MSG_NEWRULE,
3458                                         NLM_F_MULTI | NLM_F_APPEND,
3459                                         table->family,
3460                                         table, chain, rule, handle, reset) < 0)
3461                         return 1;
3462
3463                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3464 cont:
3465                 prule = rule;
3466 cont_skip:
3467                 (*idx)++;
3468         }
3469         return 0;
3470 }
3471
3472 static int nf_tables_dump_rules(struct sk_buff *skb,
3473                                 struct netlink_callback *cb)
3474 {
3475         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3476         const struct nft_rule_dump_ctx *ctx = cb->data;
3477         struct nft_table *table;
3478         const struct nft_chain *chain;
3479         unsigned int idx = 0;
3480         struct net *net = sock_net(skb->sk);
3481         int family = nfmsg->nfgen_family;
3482         struct nftables_pernet *nft_net;
3483         bool reset = false;
3484
3485         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3486                 reset = true;
3487
3488         rcu_read_lock();
3489         nft_net = nft_pernet(net);
3490         cb->seq = READ_ONCE(nft_net->base_seq);
3491
3492         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3493                 if (family != NFPROTO_UNSPEC && family != table->family)
3494                         continue;
3495
3496                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3497                         continue;
3498
3499                 if (ctx && ctx->table && ctx->chain) {
3500                         struct rhlist_head *list, *tmp;
3501
3502                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3503                                                nft_chain_ht_params);
3504                         if (!list)
3505                                 goto done;
3506
3507                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3508                                 if (!nft_is_active(net, chain))
3509                                         continue;
3510                                 __nf_tables_dump_rules(skb, &idx,
3511                                                        cb, table, chain, reset);
3512                                 break;
3513                         }
3514                         goto done;
3515                 }
3516
3517                 list_for_each_entry_rcu(chain, &table->chains, list) {
3518                         if (__nf_tables_dump_rules(skb, &idx,
3519                                                    cb, table, chain, reset))
3520                                 goto done;
3521                 }
3522
3523                 if (ctx && ctx->table)
3524                         break;
3525         }
3526 done:
3527         rcu_read_unlock();
3528
3529         cb->args[0] = idx;
3530         return skb->len;
3531 }
3532
3533 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3534 {
3535         const struct nlattr * const *nla = cb->data;
3536         struct nft_rule_dump_ctx *ctx = NULL;
3537
3538         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3539                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3540                 if (!ctx)
3541                         return -ENOMEM;
3542
3543                 if (nla[NFTA_RULE_TABLE]) {
3544                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3545                                                         GFP_ATOMIC);
3546                         if (!ctx->table) {
3547                                 kfree(ctx);
3548                                 return -ENOMEM;
3549                         }
3550                 }
3551                 if (nla[NFTA_RULE_CHAIN]) {
3552                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3553                                                 GFP_ATOMIC);
3554                         if (!ctx->chain) {
3555                                 kfree(ctx->table);
3556                                 kfree(ctx);
3557                                 return -ENOMEM;
3558                         }
3559                 }
3560         }
3561
3562         cb->data = ctx;
3563         return 0;
3564 }
3565
3566 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3567 {
3568         struct nft_rule_dump_ctx *ctx = cb->data;
3569
3570         if (ctx) {
3571                 kfree(ctx->table);
3572                 kfree(ctx->chain);
3573                 kfree(ctx);
3574         }
3575         return 0;
3576 }
3577
3578 /* called with rcu_read_lock held */
3579 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3580                              const struct nlattr * const nla[])
3581 {
3582         struct netlink_ext_ack *extack = info->extack;
3583         u8 genmask = nft_genmask_cur(info->net);
3584         u8 family = info->nfmsg->nfgen_family;
3585         const struct nft_chain *chain;
3586         const struct nft_rule *rule;
3587         struct net *net = info->net;
3588         struct nft_table *table;
3589         struct sk_buff *skb2;
3590         bool reset = false;
3591         int err;
3592
3593         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3594                 struct netlink_dump_control c = {
3595                         .start= nf_tables_dump_rules_start,
3596                         .dump = nf_tables_dump_rules,
3597                         .done = nf_tables_dump_rules_done,
3598                         .module = THIS_MODULE,
3599                         .data = (void *)nla,
3600                 };
3601
3602                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3603         }
3604
3605         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3606         if (IS_ERR(table)) {
3607                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3608                 return PTR_ERR(table);
3609         }
3610
3611         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3612         if (IS_ERR(chain)) {
3613                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3614                 return PTR_ERR(chain);
3615         }
3616
3617         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3618         if (IS_ERR(rule)) {
3619                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3620                 return PTR_ERR(rule);
3621         }
3622
3623         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3624         if (!skb2)
3625                 return -ENOMEM;
3626
3627         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3628                 reset = true;
3629
3630         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3631                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3632                                        family, table, chain, rule, 0, reset);
3633         if (err < 0)
3634                 goto err_fill_rule_info;
3635
3636         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3637
3638 err_fill_rule_info:
3639         kfree_skb(skb2);
3640         return err;
3641 }
3642
3643 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3644 {
3645         struct nft_expr *expr, *next;
3646
3647         /*
3648          * Careful: some expressions might not be initialized in case this
3649          * is called on error from nf_tables_newrule().
3650          */
3651         expr = nft_expr_first(rule);
3652         while (nft_expr_more(rule, expr)) {
3653                 next = nft_expr_next(expr);
3654                 nf_tables_expr_destroy(ctx, expr);
3655                 expr = next;
3656         }
3657         kfree(rule);
3658 }
3659
3660 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3661 {
3662         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3663         nf_tables_rule_destroy(ctx, rule);
3664 }
3665
3666 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3667 {
3668         struct nft_expr *expr, *last;
3669         const struct nft_data *data;
3670         struct nft_rule *rule;
3671         int err;
3672
3673         if (ctx->level == NFT_JUMP_STACK_SIZE)
3674                 return -EMLINK;
3675
3676         list_for_each_entry(rule, &chain->rules, list) {
3677                 if (!nft_is_active_next(ctx->net, rule))
3678                         continue;
3679
3680                 nft_rule_for_each_expr(expr, last, rule) {
3681                         if (!expr->ops->validate)
3682                                 continue;
3683
3684                         err = expr->ops->validate(ctx, expr, &data);
3685                         if (err < 0)
3686                                 return err;
3687                 }
3688
3689                 cond_resched();
3690         }
3691
3692         return 0;
3693 }
3694 EXPORT_SYMBOL_GPL(nft_chain_validate);
3695
3696 static int nft_table_validate(struct net *net, const struct nft_table *table)
3697 {
3698         struct nft_chain *chain;
3699         struct nft_ctx ctx = {
3700                 .net    = net,
3701                 .family = table->family,
3702         };
3703         int err;
3704
3705         list_for_each_entry(chain, &table->chains, list) {
3706                 if (!nft_is_base_chain(chain))
3707                         continue;
3708
3709                 ctx.chain = chain;
3710                 err = nft_chain_validate(&ctx, chain);
3711                 if (err < 0)
3712                         return err;
3713         }
3714
3715         return 0;
3716 }
3717
3718 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3719                          const struct nft_set_iter *iter,
3720                          struct nft_set_elem *elem)
3721 {
3722         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3723         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3724         const struct nft_data *data;
3725         int err;
3726
3727         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3728             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3729                 return 0;
3730
3731         data = nft_set_ext_data(ext);
3732         switch (data->verdict.code) {
3733         case NFT_JUMP:
3734         case NFT_GOTO:
3735                 pctx->level++;
3736                 err = nft_chain_validate(ctx, data->verdict.chain);
3737                 if (err < 0)
3738                         return err;
3739                 pctx->level--;
3740                 break;
3741         default:
3742                 break;
3743         }
3744
3745         return 0;
3746 }
3747
3748 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3749 {
3750         u8 genmask = nft_genmask_next(ctx->net);
3751         struct nft_set_elem_catchall *catchall;
3752         struct nft_set_elem elem;
3753         struct nft_set_ext *ext;
3754         int ret = 0;
3755
3756         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3757                 ext = nft_set_elem_ext(set, catchall->elem);
3758                 if (!nft_set_elem_active(ext, genmask))
3759                         continue;
3760
3761                 elem.priv = catchall->elem;
3762                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3763                 if (ret < 0)
3764                         return ret;
3765         }
3766
3767         return ret;
3768 }
3769
3770 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3771                                              const struct nft_chain *chain,
3772                                              const struct nlattr *nla);
3773
3774 #define NFT_RULE_MAXEXPRS       128
3775
3776 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3777                              const struct nlattr * const nla[])
3778 {
3779         struct nftables_pernet *nft_net = nft_pernet(info->net);
3780         struct netlink_ext_ack *extack = info->extack;
3781         unsigned int size, i, n, ulen = 0, usize = 0;
3782         u8 genmask = nft_genmask_next(info->net);
3783         struct nft_rule *rule, *old_rule = NULL;
3784         struct nft_expr_info *expr_info = NULL;
3785         u8 family = info->nfmsg->nfgen_family;
3786         struct nft_flow_rule *flow = NULL;
3787         struct net *net = info->net;
3788         struct nft_userdata *udata;
3789         struct nft_table *table;
3790         struct nft_chain *chain;
3791         struct nft_trans *trans;
3792         u64 handle, pos_handle;
3793         struct nft_expr *expr;
3794         struct nft_ctx ctx;
3795         struct nlattr *tmp;
3796         int err, rem;
3797
3798         lockdep_assert_held(&nft_net->commit_mutex);
3799
3800         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3801                                  NETLINK_CB(skb).portid);
3802         if (IS_ERR(table)) {
3803                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3804                 return PTR_ERR(table);
3805         }
3806
3807         if (nla[NFTA_RULE_CHAIN]) {
3808                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3809                                          genmask);
3810                 if (IS_ERR(chain)) {
3811                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3812                         return PTR_ERR(chain);
3813                 }
3814                 if (nft_chain_is_bound(chain))
3815                         return -EOPNOTSUPP;
3816
3817         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3818                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3819                                               genmask);
3820                 if (IS_ERR(chain)) {
3821                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3822                         return PTR_ERR(chain);
3823                 }
3824         } else {
3825                 return -EINVAL;
3826         }
3827
3828         if (nla[NFTA_RULE_HANDLE]) {
3829                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3830                 rule = __nft_rule_lookup(chain, handle);
3831                 if (IS_ERR(rule)) {
3832                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3833                         return PTR_ERR(rule);
3834                 }
3835
3836                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3837                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3838                         return -EEXIST;
3839                 }
3840                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3841                         old_rule = rule;
3842                 else
3843                         return -EOPNOTSUPP;
3844         } else {
3845                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3846                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3847                         return -EINVAL;
3848                 handle = nf_tables_alloc_handle(table);
3849
3850                 if (nla[NFTA_RULE_POSITION]) {
3851                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3852                         old_rule = __nft_rule_lookup(chain, pos_handle);
3853                         if (IS_ERR(old_rule)) {
3854                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3855                                 return PTR_ERR(old_rule);
3856                         }
3857                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3858                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3859                         if (IS_ERR(old_rule)) {
3860                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3861                                 return PTR_ERR(old_rule);
3862                         }
3863                 }
3864         }
3865
3866         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3867
3868         n = 0;
3869         size = 0;
3870         if (nla[NFTA_RULE_EXPRESSIONS]) {
3871                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3872                                            sizeof(struct nft_expr_info),
3873                                            GFP_KERNEL);
3874                 if (!expr_info)
3875                         return -ENOMEM;
3876
3877                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3878                         err = -EINVAL;
3879                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3880                                 goto err_release_expr;
3881                         if (n == NFT_RULE_MAXEXPRS)
3882                                 goto err_release_expr;
3883                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3884                         if (err < 0) {
3885                                 NL_SET_BAD_ATTR(extack, tmp);
3886                                 goto err_release_expr;
3887                         }
3888                         size += expr_info[n].ops->size;
3889                         n++;
3890                 }
3891         }
3892         /* Check for overflow of dlen field */
3893         err = -EFBIG;
3894         if (size >= 1 << 12)
3895                 goto err_release_expr;
3896
3897         if (nla[NFTA_RULE_USERDATA]) {
3898                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3899                 if (ulen > 0)
3900                         usize = sizeof(struct nft_userdata) + ulen;
3901         }
3902
3903         err = -ENOMEM;
3904         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3905         if (rule == NULL)
3906                 goto err_release_expr;
3907
3908         nft_activate_next(net, rule);
3909
3910         rule->handle = handle;
3911         rule->dlen   = size;
3912         rule->udata  = ulen ? 1 : 0;
3913
3914         if (ulen) {
3915                 udata = nft_userdata(rule);
3916                 udata->len = ulen - 1;
3917                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3918         }
3919
3920         expr = nft_expr_first(rule);
3921         for (i = 0; i < n; i++) {
3922                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3923                 if (err < 0) {
3924                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3925                         goto err_release_rule;
3926                 }
3927
3928                 if (expr_info[i].ops->validate)
3929                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3930
3931                 expr_info[i].ops = NULL;
3932                 expr = nft_expr_next(expr);
3933         }
3934
3935         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3936                 flow = nft_flow_rule_create(net, rule);
3937                 if (IS_ERR(flow)) {
3938                         err = PTR_ERR(flow);
3939                         goto err_release_rule;
3940                 }
3941         }
3942
3943         if (!nft_use_inc(&chain->use)) {
3944                 err = -EMFILE;
3945                 goto err_release_rule;
3946         }
3947
3948         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3949                 err = nft_delrule(&ctx, old_rule);
3950                 if (err < 0)
3951                         goto err_destroy_flow_rule;
3952
3953                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3954                 if (trans == NULL) {
3955                         err = -ENOMEM;
3956                         goto err_destroy_flow_rule;
3957                 }
3958                 list_add_tail_rcu(&rule->list, &old_rule->list);
3959         } else {
3960                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3961                 if (!trans) {
3962                         err = -ENOMEM;
3963                         goto err_destroy_flow_rule;
3964                 }
3965
3966                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3967                         if (old_rule)
3968                                 list_add_rcu(&rule->list, &old_rule->list);
3969                         else
3970                                 list_add_tail_rcu(&rule->list, &chain->rules);
3971                  } else {
3972                         if (old_rule)
3973                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3974                         else
3975                                 list_add_rcu(&rule->list, &chain->rules);
3976                 }
3977         }
3978         kvfree(expr_info);
3979
3980         if (flow)
3981                 nft_trans_flow_rule(trans) = flow;
3982
3983         if (table->validate_state == NFT_VALIDATE_DO)
3984                 return nft_table_validate(net, table);
3985
3986         return 0;
3987
3988 err_destroy_flow_rule:
3989         nft_use_dec_restore(&chain->use);
3990         if (flow)
3991                 nft_flow_rule_destroy(flow);
3992 err_release_rule:
3993         nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
3994         nf_tables_rule_destroy(&ctx, rule);
3995 err_release_expr:
3996         for (i = 0; i < n; i++) {
3997                 if (expr_info[i].ops) {
3998                         module_put(expr_info[i].ops->type->owner);
3999                         if (expr_info[i].ops->type->release_ops)
4000                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4001                 }
4002         }
4003         kvfree(expr_info);
4004
4005         return err;
4006 }
4007
4008 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4009                                              const struct nft_chain *chain,
4010                                              const struct nlattr *nla)
4011 {
4012         struct nftables_pernet *nft_net = nft_pernet(net);
4013         u32 id = ntohl(nla_get_be32(nla));
4014         struct nft_trans *trans;
4015
4016         list_for_each_entry(trans, &nft_net->commit_list, list) {
4017                 if (trans->msg_type == NFT_MSG_NEWRULE &&
4018                     trans->ctx.chain == chain &&
4019                     id == nft_trans_rule_id(trans))
4020                         return nft_trans_rule(trans);
4021         }
4022         return ERR_PTR(-ENOENT);
4023 }
4024
4025 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4026                              const struct nlattr * const nla[])
4027 {
4028         struct netlink_ext_ack *extack = info->extack;
4029         u8 genmask = nft_genmask_next(info->net);
4030         u8 family = info->nfmsg->nfgen_family;
4031         struct nft_chain *chain = NULL;
4032         struct net *net = info->net;
4033         struct nft_table *table;
4034         struct nft_rule *rule;
4035         struct nft_ctx ctx;
4036         int err = 0;
4037
4038         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4039                                  NETLINK_CB(skb).portid);
4040         if (IS_ERR(table)) {
4041                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4042                 return PTR_ERR(table);
4043         }
4044
4045         if (nla[NFTA_RULE_CHAIN]) {
4046                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4047                                          genmask);
4048                 if (IS_ERR(chain)) {
4049                         if (PTR_ERR(chain) == -ENOENT &&
4050                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4051                                 return 0;
4052
4053                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4054                         return PTR_ERR(chain);
4055                 }
4056                 if (nft_chain_is_bound(chain))
4057                         return -EOPNOTSUPP;
4058         }
4059
4060         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4061
4062         if (chain) {
4063                 if (nla[NFTA_RULE_HANDLE]) {
4064                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4065                         if (IS_ERR(rule)) {
4066                                 if (PTR_ERR(rule) == -ENOENT &&
4067                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4068                                         return 0;
4069
4070                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4071                                 return PTR_ERR(rule);
4072                         }
4073
4074                         err = nft_delrule(&ctx, rule);
4075                 } else if (nla[NFTA_RULE_ID]) {
4076                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4077                         if (IS_ERR(rule)) {
4078                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4079                                 return PTR_ERR(rule);
4080                         }
4081
4082                         err = nft_delrule(&ctx, rule);
4083                 } else {
4084                         err = nft_delrule_by_chain(&ctx);
4085                 }
4086         } else {
4087                 list_for_each_entry(chain, &table->chains, list) {
4088                         if (!nft_is_active_next(net, chain))
4089                                 continue;
4090
4091                         ctx.chain = chain;
4092                         err = nft_delrule_by_chain(&ctx);
4093                         if (err < 0)
4094                                 break;
4095                 }
4096         }
4097
4098         return err;
4099 }
4100
4101 /*
4102  * Sets
4103  */
4104 static const struct nft_set_type *nft_set_types[] = {
4105         &nft_set_hash_fast_type,
4106         &nft_set_hash_type,
4107         &nft_set_rhash_type,
4108         &nft_set_bitmap_type,
4109         &nft_set_rbtree_type,
4110 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4111         &nft_set_pipapo_avx2_type,
4112 #endif
4113         &nft_set_pipapo_type,
4114 };
4115
4116 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
4117                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4118                                  NFT_SET_EVAL)
4119
4120 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4121 {
4122         return (flags & type->features) == (flags & NFT_SET_FEATURES);
4123 }
4124
4125 /*
4126  * Select a set implementation based on the data characteristics and the
4127  * given policy. The total memory use might not be known if no size is
4128  * given, in that case the amount of memory per element is used.
4129  */
4130 static const struct nft_set_ops *
4131 nft_select_set_ops(const struct nft_ctx *ctx,
4132                    const struct nlattr * const nla[],
4133                    const struct nft_set_desc *desc)
4134 {
4135         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4136         const struct nft_set_ops *ops, *bops;
4137         struct nft_set_estimate est, best;
4138         const struct nft_set_type *type;
4139         u32 flags = 0;
4140         int i;
4141
4142         lockdep_assert_held(&nft_net->commit_mutex);
4143         lockdep_nfnl_nft_mutex_not_held();
4144
4145         if (nla[NFTA_SET_FLAGS] != NULL)
4146                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4147
4148         bops        = NULL;
4149         best.size   = ~0;
4150         best.lookup = ~0;
4151         best.space  = ~0;
4152
4153         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4154                 type = nft_set_types[i];
4155                 ops = &type->ops;
4156
4157                 if (!nft_set_ops_candidate(type, flags))
4158                         continue;
4159                 if (!ops->estimate(desc, flags, &est))
4160                         continue;
4161
4162                 switch (desc->policy) {
4163                 case NFT_SET_POL_PERFORMANCE:
4164                         if (est.lookup < best.lookup)
4165                                 break;
4166                         if (est.lookup == best.lookup &&
4167                             est.space < best.space)
4168                                 break;
4169                         continue;
4170                 case NFT_SET_POL_MEMORY:
4171                         if (!desc->size) {
4172                                 if (est.space < best.space)
4173                                         break;
4174                                 if (est.space == best.space &&
4175                                     est.lookup < best.lookup)
4176                                         break;
4177                         } else if (est.size < best.size || !bops) {
4178                                 break;
4179                         }
4180                         continue;
4181                 default:
4182                         break;
4183                 }
4184
4185                 bops = ops;
4186                 best = est;
4187         }
4188
4189         if (bops != NULL)
4190                 return bops;
4191
4192         return ERR_PTR(-EOPNOTSUPP);
4193 }
4194
4195 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4196         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4197                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4198         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4199                                             .len = NFT_SET_MAXNAMELEN - 1 },
4200         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4201         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4202         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4203         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4204         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4205         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4206         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4207         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4208         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4209         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4210         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4211                                             .len  = NFT_USERDATA_MAXLEN },
4212         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4213         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4214         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4215         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4216 };
4217
4218 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4219         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4220         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4221 };
4222
4223 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4224                                       const struct nlattr *nla, u8 genmask)
4225 {
4226         struct nft_set *set;
4227
4228         if (nla == NULL)
4229                 return ERR_PTR(-EINVAL);
4230
4231         list_for_each_entry_rcu(set, &table->sets, list) {
4232                 if (!nla_strcmp(nla, set->name) &&
4233                     nft_active_genmask(set, genmask))
4234                         return set;
4235         }
4236         return ERR_PTR(-ENOENT);
4237 }
4238
4239 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4240                                                const struct nlattr *nla,
4241                                                u8 genmask)
4242 {
4243         struct nft_set *set;
4244
4245         list_for_each_entry(set, &table->sets, list) {
4246                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4247                     nft_active_genmask(set, genmask))
4248                         return set;
4249         }
4250         return ERR_PTR(-ENOENT);
4251 }
4252
4253 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4254                                            const struct nft_table *table,
4255                                            const struct nlattr *nla, u8 genmask)
4256 {
4257         struct nftables_pernet *nft_net = nft_pernet(net);
4258         u32 id = ntohl(nla_get_be32(nla));
4259         struct nft_trans *trans;
4260
4261         list_for_each_entry(trans, &nft_net->commit_list, list) {
4262                 if (trans->msg_type == NFT_MSG_NEWSET) {
4263                         struct nft_set *set = nft_trans_set(trans);
4264
4265                         if (id == nft_trans_set_id(trans) &&
4266                             set->table == table &&
4267                             nft_active_genmask(set, genmask))
4268                                 return set;
4269                 }
4270         }
4271         return ERR_PTR(-ENOENT);
4272 }
4273
4274 struct nft_set *nft_set_lookup_global(const struct net *net,
4275                                       const struct nft_table *table,
4276                                       const struct nlattr *nla_set_name,
4277                                       const struct nlattr *nla_set_id,
4278                                       u8 genmask)
4279 {
4280         struct nft_set *set;
4281
4282         set = nft_set_lookup(table, nla_set_name, genmask);
4283         if (IS_ERR(set)) {
4284                 if (!nla_set_id)
4285                         return set;
4286
4287                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4288         }
4289         return set;
4290 }
4291 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4292
4293 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4294                                     const char *name)
4295 {
4296         const struct nft_set *i;
4297         const char *p;
4298         unsigned long *inuse;
4299         unsigned int n = 0, min = 0;
4300
4301         p = strchr(name, '%');
4302         if (p != NULL) {
4303                 if (p[1] != 'd' || strchr(p + 2, '%'))
4304                         return -EINVAL;
4305
4306                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4307                 if (inuse == NULL)
4308                         return -ENOMEM;
4309 cont:
4310                 list_for_each_entry(i, &ctx->table->sets, list) {
4311                         int tmp;
4312
4313                         if (!nft_is_active_next(ctx->net, i))
4314                                 continue;
4315                         if (!sscanf(i->name, name, &tmp))
4316                                 continue;
4317                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4318                                 continue;
4319
4320                         set_bit(tmp - min, inuse);
4321                 }
4322
4323                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4324                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4325                         min += BITS_PER_BYTE * PAGE_SIZE;
4326                         memset(inuse, 0, PAGE_SIZE);
4327                         goto cont;
4328                 }
4329                 free_page((unsigned long)inuse);
4330         }
4331
4332         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4333         if (!set->name)
4334                 return -ENOMEM;
4335
4336         list_for_each_entry(i, &ctx->table->sets, list) {
4337                 if (!nft_is_active_next(ctx->net, i))
4338                         continue;
4339                 if (!strcmp(set->name, i->name)) {
4340                         kfree(set->name);
4341                         set->name = NULL;
4342                         return -ENFILE;
4343                 }
4344         }
4345         return 0;
4346 }
4347
4348 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4349 {
4350         u64 ms = be64_to_cpu(nla_get_be64(nla));
4351         u64 max = (u64)(~((u64)0));
4352
4353         max = div_u64(max, NSEC_PER_MSEC);
4354         if (ms >= max)
4355                 return -ERANGE;
4356
4357         ms *= NSEC_PER_MSEC;
4358         *result = nsecs_to_jiffies64(ms);
4359         return 0;
4360 }
4361
4362 __be64 nf_jiffies64_to_msecs(u64 input)
4363 {
4364         return cpu_to_be64(jiffies64_to_msecs(input));
4365 }
4366
4367 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4368                                      const struct nft_set *set)
4369 {
4370         struct nlattr *concat, *field;
4371         int i;
4372
4373         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4374         if (!concat)
4375                 return -ENOMEM;
4376
4377         for (i = 0; i < set->field_count; i++) {
4378                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4379                 if (!field)
4380                         return -ENOMEM;
4381
4382                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4383                                  htonl(set->field_len[i])))
4384                         return -ENOMEM;
4385
4386                 nla_nest_end(skb, field);
4387         }
4388
4389         nla_nest_end(skb, concat);
4390
4391         return 0;
4392 }
4393
4394 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4395                               const struct nft_set *set, u16 event, u16 flags)
4396 {
4397         u64 timeout = READ_ONCE(set->timeout);
4398         u32 gc_int = READ_ONCE(set->gc_int);
4399         u32 portid = ctx->portid;
4400         struct nlmsghdr *nlh;
4401         struct nlattr *nest;
4402         u32 seq = ctx->seq;
4403         int i;
4404
4405         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4406         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4407                            NFNETLINK_V0, nft_base_seq(ctx->net));
4408         if (!nlh)
4409                 goto nla_put_failure;
4410
4411         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4412                 goto nla_put_failure;
4413         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4414                 goto nla_put_failure;
4415         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4416                          NFTA_SET_PAD))
4417                 goto nla_put_failure;
4418
4419         if (event == NFT_MSG_DELSET) {
4420                 nlmsg_end(skb, nlh);
4421                 return 0;
4422         }
4423
4424         if (set->flags != 0)
4425                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4426                         goto nla_put_failure;
4427
4428         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4429                 goto nla_put_failure;
4430         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4431                 goto nla_put_failure;
4432         if (set->flags & NFT_SET_MAP) {
4433                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4434                         goto nla_put_failure;
4435                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4436                         goto nla_put_failure;
4437         }
4438         if (set->flags & NFT_SET_OBJECT &&
4439             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4440                 goto nla_put_failure;
4441
4442         if (timeout &&
4443             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4444                          nf_jiffies64_to_msecs(timeout),
4445                          NFTA_SET_PAD))
4446                 goto nla_put_failure;
4447         if (gc_int &&
4448             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4449                 goto nla_put_failure;
4450
4451         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4452                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4453                         goto nla_put_failure;
4454         }
4455
4456         if (set->udata &&
4457             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4458                 goto nla_put_failure;
4459
4460         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4461         if (!nest)
4462                 goto nla_put_failure;
4463         if (set->size &&
4464             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4465                 goto nla_put_failure;
4466
4467         if (set->field_count > 1 &&
4468             nf_tables_fill_set_concat(skb, set))
4469                 goto nla_put_failure;
4470
4471         nla_nest_end(skb, nest);
4472
4473         if (set->num_exprs == 1) {
4474                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4475                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4476                         goto nla_put_failure;
4477
4478                 nla_nest_end(skb, nest);
4479         } else if (set->num_exprs > 1) {
4480                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4481                 if (nest == NULL)
4482                         goto nla_put_failure;
4483
4484                 for (i = 0; i < set->num_exprs; i++) {
4485                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4486                                           set->exprs[i], false) < 0)
4487                                 goto nla_put_failure;
4488                 }
4489                 nla_nest_end(skb, nest);
4490         }
4491
4492         nlmsg_end(skb, nlh);
4493         return 0;
4494
4495 nla_put_failure:
4496         nlmsg_trim(skb, nlh);
4497         return -1;
4498 }
4499
4500 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4501                                  const struct nft_set *set, int event,
4502                                  gfp_t gfp_flags)
4503 {
4504         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4505         u32 portid = ctx->portid;
4506         struct sk_buff *skb;
4507         u16 flags = 0;
4508         int err;
4509
4510         if (!ctx->report &&
4511             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4512                 return;
4513
4514         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4515         if (skb == NULL)
4516                 goto err;
4517
4518         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4519                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4520
4521         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4522         if (err < 0) {
4523                 kfree_skb(skb);
4524                 goto err;
4525         }
4526
4527         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4528         return;
4529 err:
4530         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4531 }
4532
4533 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4534 {
4535         const struct nft_set *set;
4536         unsigned int idx, s_idx = cb->args[0];
4537         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4538         struct net *net = sock_net(skb->sk);
4539         struct nft_ctx *ctx = cb->data, ctx_set;
4540         struct nftables_pernet *nft_net;
4541
4542         if (cb->args[1])
4543                 return skb->len;
4544
4545         rcu_read_lock();
4546         nft_net = nft_pernet(net);
4547         cb->seq = READ_ONCE(nft_net->base_seq);
4548
4549         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4550                 if (ctx->family != NFPROTO_UNSPEC &&
4551                     ctx->family != table->family)
4552                         continue;
4553
4554                 if (ctx->table && ctx->table != table)
4555                         continue;
4556
4557                 if (cur_table) {
4558                         if (cur_table != table)
4559                                 continue;
4560
4561                         cur_table = NULL;
4562                 }
4563                 idx = 0;
4564                 list_for_each_entry_rcu(set, &table->sets, list) {
4565                         if (idx < s_idx)
4566                                 goto cont;
4567                         if (!nft_is_active(net, set))
4568                                 goto cont;
4569
4570                         ctx_set = *ctx;
4571                         ctx_set.table = table;
4572                         ctx_set.family = table->family;
4573
4574                         if (nf_tables_fill_set(skb, &ctx_set, set,
4575                                                NFT_MSG_NEWSET,
4576                                                NLM_F_MULTI) < 0) {
4577                                 cb->args[0] = idx;
4578                                 cb->args[2] = (unsigned long) table;
4579                                 goto done;
4580                         }
4581                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4582 cont:
4583                         idx++;
4584                 }
4585                 if (s_idx)
4586                         s_idx = 0;
4587         }
4588         cb->args[1] = 1;
4589 done:
4590         rcu_read_unlock();
4591         return skb->len;
4592 }
4593
4594 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4595 {
4596         struct nft_ctx *ctx_dump = NULL;
4597
4598         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4599         if (ctx_dump == NULL)
4600                 return -ENOMEM;
4601
4602         cb->data = ctx_dump;
4603         return 0;
4604 }
4605
4606 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4607 {
4608         kfree(cb->data);
4609         return 0;
4610 }
4611
4612 /* called with rcu_read_lock held */
4613 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4614                             const struct nlattr * const nla[])
4615 {
4616         struct netlink_ext_ack *extack = info->extack;
4617         u8 genmask = nft_genmask_cur(info->net);
4618         u8 family = info->nfmsg->nfgen_family;
4619         struct nft_table *table = NULL;
4620         struct net *net = info->net;
4621         const struct nft_set *set;
4622         struct sk_buff *skb2;
4623         struct nft_ctx ctx;
4624         int err;
4625
4626         if (nla[NFTA_SET_TABLE]) {
4627                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4628                                          genmask, 0);
4629                 if (IS_ERR(table)) {
4630                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4631                         return PTR_ERR(table);
4632                 }
4633         }
4634
4635         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4636
4637         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4638                 struct netlink_dump_control c = {
4639                         .start = nf_tables_dump_sets_start,
4640                         .dump = nf_tables_dump_sets,
4641                         .done = nf_tables_dump_sets_done,
4642                         .data = &ctx,
4643                         .module = THIS_MODULE,
4644                 };
4645
4646                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4647         }
4648
4649         /* Only accept unspec with dump */
4650         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4651                 return -EAFNOSUPPORT;
4652         if (!nla[NFTA_SET_TABLE])
4653                 return -EINVAL;
4654
4655         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4656         if (IS_ERR(set))
4657                 return PTR_ERR(set);
4658
4659         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4660         if (skb2 == NULL)
4661                 return -ENOMEM;
4662
4663         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4664         if (err < 0)
4665                 goto err_fill_set_info;
4666
4667         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4668
4669 err_fill_set_info:
4670         kfree_skb(skb2);
4671         return err;
4672 }
4673
4674 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4675         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4676 };
4677
4678 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4679                                      struct nft_set_desc *desc)
4680 {
4681         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4682         u32 len;
4683         int err;
4684
4685         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4686                 return -E2BIG;
4687
4688         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4689                                           nft_concat_policy, NULL);
4690         if (err < 0)
4691                 return err;
4692
4693         if (!tb[NFTA_SET_FIELD_LEN])
4694                 return -EINVAL;
4695
4696         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4697         if (!len || len > U8_MAX)
4698                 return -EINVAL;
4699
4700         desc->field_len[desc->field_count++] = len;
4701
4702         return 0;
4703 }
4704
4705 static int nft_set_desc_concat(struct nft_set_desc *desc,
4706                                const struct nlattr *nla)
4707 {
4708         struct nlattr *attr;
4709         u32 num_regs = 0;
4710         int rem, err, i;
4711
4712         nla_for_each_nested(attr, nla, rem) {
4713                 if (nla_type(attr) != NFTA_LIST_ELEM)
4714                         return -EINVAL;
4715
4716                 err = nft_set_desc_concat_parse(attr, desc);
4717                 if (err < 0)
4718                         return err;
4719         }
4720
4721         for (i = 0; i < desc->field_count; i++)
4722                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4723
4724         if (num_regs > NFT_REG32_COUNT)
4725                 return -E2BIG;
4726
4727         return 0;
4728 }
4729
4730 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4731                                     const struct nlattr *nla)
4732 {
4733         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4734         int err;
4735
4736         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4737                                           nft_set_desc_policy, NULL);
4738         if (err < 0)
4739                 return err;
4740
4741         if (da[NFTA_SET_DESC_SIZE] != NULL)
4742                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4743         if (da[NFTA_SET_DESC_CONCAT])
4744                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4745
4746         return err;
4747 }
4748
4749 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4750                               const struct nlattr * const *nla,
4751                               struct nft_expr **exprs, int *num_exprs,
4752                               u32 flags)
4753 {
4754         struct nft_expr *expr;
4755         int err, i;
4756
4757         if (nla[NFTA_SET_EXPR]) {
4758                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4759                 if (IS_ERR(expr)) {
4760                         err = PTR_ERR(expr);
4761                         goto err_set_expr_alloc;
4762                 }
4763                 exprs[0] = expr;
4764                 (*num_exprs)++;
4765         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4766                 struct nlattr *tmp;
4767                 int left;
4768
4769                 if (!(flags & NFT_SET_EXPR)) {
4770                         err = -EINVAL;
4771                         goto err_set_expr_alloc;
4772                 }
4773                 i = 0;
4774                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4775                         if (i == NFT_SET_EXPR_MAX) {
4776                                 err = -E2BIG;
4777                                 goto err_set_expr_alloc;
4778                         }
4779                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4780                                 err = -EINVAL;
4781                                 goto err_set_expr_alloc;
4782                         }
4783                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4784                         if (IS_ERR(expr)) {
4785                                 err = PTR_ERR(expr);
4786                                 goto err_set_expr_alloc;
4787                         }
4788                         exprs[i++] = expr;
4789                         (*num_exprs)++;
4790                 }
4791         }
4792
4793         return 0;
4794
4795 err_set_expr_alloc:
4796         for (i = 0; i < *num_exprs; i++)
4797                 nft_expr_destroy(ctx, exprs[i]);
4798
4799         return err;
4800 }
4801
4802 static bool nft_set_is_same(const struct nft_set *set,
4803                             const struct nft_set_desc *desc,
4804                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4805 {
4806         int i;
4807
4808         if (set->ktype != desc->ktype ||
4809             set->dtype != desc->dtype ||
4810             set->flags != flags ||
4811             set->klen != desc->klen ||
4812             set->dlen != desc->dlen ||
4813             set->field_count != desc->field_count ||
4814             set->num_exprs != num_exprs)
4815                 return false;
4816
4817         for (i = 0; i < desc->field_count; i++) {
4818                 if (set->field_len[i] != desc->field_len[i])
4819                         return false;
4820         }
4821
4822         for (i = 0; i < num_exprs; i++) {
4823                 if (set->exprs[i]->ops != exprs[i]->ops)
4824                         return false;
4825         }
4826
4827         return true;
4828 }
4829
4830 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4831                             const struct nlattr * const nla[])
4832 {
4833         struct netlink_ext_ack *extack = info->extack;
4834         u8 genmask = nft_genmask_next(info->net);
4835         u8 family = info->nfmsg->nfgen_family;
4836         const struct nft_set_ops *ops;
4837         struct net *net = info->net;
4838         struct nft_set_desc desc;
4839         struct nft_table *table;
4840         unsigned char *udata;
4841         struct nft_set *set;
4842         struct nft_ctx ctx;
4843         size_t alloc_size;
4844         int num_exprs = 0;
4845         char *name;
4846         int err, i;
4847         u16 udlen;
4848         u32 flags;
4849         u64 size;
4850
4851         if (nla[NFTA_SET_TABLE] == NULL ||
4852             nla[NFTA_SET_NAME] == NULL ||
4853             nla[NFTA_SET_KEY_LEN] == NULL ||
4854             nla[NFTA_SET_ID] == NULL)
4855                 return -EINVAL;
4856
4857         memset(&desc, 0, sizeof(desc));
4858
4859         desc.ktype = NFT_DATA_VALUE;
4860         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4861                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4862                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4863                         return -EINVAL;
4864         }
4865
4866         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4867         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4868                 return -EINVAL;
4869
4870         flags = 0;
4871         if (nla[NFTA_SET_FLAGS] != NULL) {
4872                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4873                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4874                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4875                               NFT_SET_MAP | NFT_SET_EVAL |
4876                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4877                         return -EOPNOTSUPP;
4878                 /* Only one of these operations is supported */
4879                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4880                              (NFT_SET_MAP | NFT_SET_OBJECT))
4881                         return -EOPNOTSUPP;
4882                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4883                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4884                         return -EOPNOTSUPP;
4885         }
4886
4887         desc.dtype = 0;
4888         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4889                 if (!(flags & NFT_SET_MAP))
4890                         return -EINVAL;
4891
4892                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4893                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4894                     desc.dtype != NFT_DATA_VERDICT)
4895                         return -EINVAL;
4896
4897                 if (desc.dtype != NFT_DATA_VERDICT) {
4898                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4899                                 return -EINVAL;
4900                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4901                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4902                                 return -EINVAL;
4903                 } else
4904                         desc.dlen = sizeof(struct nft_verdict);
4905         } else if (flags & NFT_SET_MAP)
4906                 return -EINVAL;
4907
4908         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4909                 if (!(flags & NFT_SET_OBJECT))
4910                         return -EINVAL;
4911
4912                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4913                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4914                     desc.objtype > NFT_OBJECT_MAX)
4915                         return -EOPNOTSUPP;
4916         } else if (flags & NFT_SET_OBJECT)
4917                 return -EINVAL;
4918         else
4919                 desc.objtype = NFT_OBJECT_UNSPEC;
4920
4921         desc.timeout = 0;
4922         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4923                 if (!(flags & NFT_SET_TIMEOUT))
4924                         return -EINVAL;
4925
4926                 if (flags & NFT_SET_ANONYMOUS)
4927                         return -EOPNOTSUPP;
4928
4929                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4930                 if (err)
4931                         return err;
4932         }
4933         desc.gc_int = 0;
4934         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4935                 if (!(flags & NFT_SET_TIMEOUT))
4936                         return -EINVAL;
4937
4938                 if (flags & NFT_SET_ANONYMOUS)
4939                         return -EOPNOTSUPP;
4940
4941                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4942         }
4943
4944         desc.policy = NFT_SET_POL_PERFORMANCE;
4945         if (nla[NFTA_SET_POLICY] != NULL)
4946                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4947
4948         if (nla[NFTA_SET_DESC] != NULL) {
4949                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4950                 if (err < 0)
4951                         return err;
4952
4953                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4954                         return -EINVAL;
4955         } else if (flags & NFT_SET_CONCAT) {
4956                 return -EINVAL;
4957         }
4958
4959         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4960                 desc.expr = true;
4961
4962         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4963                                  NETLINK_CB(skb).portid);
4964         if (IS_ERR(table)) {
4965                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4966                 return PTR_ERR(table);
4967         }
4968
4969         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4970
4971         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4972         if (IS_ERR(set)) {
4973                 if (PTR_ERR(set) != -ENOENT) {
4974                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4975                         return PTR_ERR(set);
4976                 }
4977         } else {
4978                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4979
4980                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4981                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4982                         return -EEXIST;
4983                 }
4984                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4985                         return -EOPNOTSUPP;
4986
4987                 if (nft_set_is_anonymous(set))
4988                         return -EOPNOTSUPP;
4989
4990                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4991                 if (err < 0)
4992                         return err;
4993
4994                 err = 0;
4995                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4996                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4997                         err = -EEXIST;
4998                 }
4999
5000                 for (i = 0; i < num_exprs; i++)
5001                         nft_expr_destroy(&ctx, exprs[i]);
5002
5003                 if (err < 0)
5004                         return err;
5005
5006                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5007         }
5008
5009         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5010                 return -ENOENT;
5011
5012         ops = nft_select_set_ops(&ctx, nla, &desc);
5013         if (IS_ERR(ops))
5014                 return PTR_ERR(ops);
5015
5016         udlen = 0;
5017         if (nla[NFTA_SET_USERDATA])
5018                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5019
5020         size = 0;
5021         if (ops->privsize != NULL)
5022                 size = ops->privsize(nla, &desc);
5023         alloc_size = sizeof(*set) + size + udlen;
5024         if (alloc_size < size || alloc_size > INT_MAX)
5025                 return -ENOMEM;
5026
5027         if (!nft_use_inc(&table->use))
5028                 return -EMFILE;
5029
5030         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5031         if (!set) {
5032                 err = -ENOMEM;
5033                 goto err_alloc;
5034         }
5035
5036         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5037         if (!name) {
5038                 err = -ENOMEM;
5039                 goto err_set_name;
5040         }
5041
5042         err = nf_tables_set_alloc_name(&ctx, set, name);
5043         kfree(name);
5044         if (err < 0)
5045                 goto err_set_name;
5046
5047         udata = NULL;
5048         if (udlen) {
5049                 udata = set->data + size;
5050                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5051         }
5052
5053         INIT_LIST_HEAD(&set->bindings);
5054         INIT_LIST_HEAD(&set->catchall_list);
5055         set->table = table;
5056         write_pnet(&set->net, net);
5057         set->ops = ops;
5058         set->ktype = desc.ktype;
5059         set->klen = desc.klen;
5060         set->dtype = desc.dtype;
5061         set->objtype = desc.objtype;
5062         set->dlen = desc.dlen;
5063         set->flags = flags;
5064         set->size = desc.size;
5065         set->policy = desc.policy;
5066         set->udlen = udlen;
5067         set->udata = udata;
5068         set->timeout = desc.timeout;
5069         set->gc_int = desc.gc_int;
5070
5071         set->field_count = desc.field_count;
5072         for (i = 0; i < desc.field_count; i++)
5073                 set->field_len[i] = desc.field_len[i];
5074
5075         err = ops->init(set, &desc, nla);
5076         if (err < 0)
5077                 goto err_set_init;
5078
5079         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5080         if (err < 0)
5081                 goto err_set_destroy;
5082
5083         set->num_exprs = num_exprs;
5084         set->handle = nf_tables_alloc_handle(table);
5085         INIT_LIST_HEAD(&set->pending_update);
5086
5087         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5088         if (err < 0)
5089                 goto err_set_expr_alloc;
5090
5091         list_add_tail_rcu(&set->list, &table->sets);
5092
5093         return 0;
5094
5095 err_set_expr_alloc:
5096         for (i = 0; i < set->num_exprs; i++)
5097                 nft_expr_destroy(&ctx, set->exprs[i]);
5098 err_set_destroy:
5099         ops->destroy(&ctx, set);
5100 err_set_init:
5101         kfree(set->name);
5102 err_set_name:
5103         kvfree(set);
5104 err_alloc:
5105         nft_use_dec_restore(&table->use);
5106
5107         return err;
5108 }
5109
5110 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5111                                      struct nft_set *set)
5112 {
5113         struct nft_set_elem_catchall *next, *catchall;
5114
5115         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5116                 list_del_rcu(&catchall->list);
5117                 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5118                 kfree_rcu(catchall, rcu);
5119         }
5120 }
5121
5122 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5123 {
5124         int i;
5125
5126         if (WARN_ON(set->use > 0))
5127                 return;
5128
5129         for (i = 0; i < set->num_exprs; i++)
5130                 nft_expr_destroy(ctx, set->exprs[i]);
5131
5132         set->ops->destroy(ctx, set);
5133         nft_set_catchall_destroy(ctx, set);
5134         kfree(set->name);
5135         kvfree(set);
5136 }
5137
5138 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5139                             const struct nlattr * const nla[])
5140 {
5141         struct netlink_ext_ack *extack = info->extack;
5142         u8 genmask = nft_genmask_next(info->net);
5143         u8 family = info->nfmsg->nfgen_family;
5144         struct net *net = info->net;
5145         const struct nlattr *attr;
5146         struct nft_table *table;
5147         struct nft_set *set;
5148         struct nft_ctx ctx;
5149
5150         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5151                 return -EAFNOSUPPORT;
5152
5153         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5154                                  genmask, NETLINK_CB(skb).portid);
5155         if (IS_ERR(table)) {
5156                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5157                 return PTR_ERR(table);
5158         }
5159
5160         if (nla[NFTA_SET_HANDLE]) {
5161                 attr = nla[NFTA_SET_HANDLE];
5162                 set = nft_set_lookup_byhandle(table, attr, genmask);
5163         } else {
5164                 attr = nla[NFTA_SET_NAME];
5165                 set = nft_set_lookup(table, attr, genmask);
5166         }
5167
5168         if (IS_ERR(set)) {
5169                 if (PTR_ERR(set) == -ENOENT &&
5170                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5171                         return 0;
5172
5173                 NL_SET_BAD_ATTR(extack, attr);
5174                 return PTR_ERR(set);
5175         }
5176         if (set->use ||
5177             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5178              atomic_read(&set->nelems) > 0)) {
5179                 NL_SET_BAD_ATTR(extack, attr);
5180                 return -EBUSY;
5181         }
5182
5183         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5184
5185         return nft_delset(&ctx, set);
5186 }
5187
5188 static int nft_validate_register_store(const struct nft_ctx *ctx,
5189                                        enum nft_registers reg,
5190                                        const struct nft_data *data,
5191                                        enum nft_data_types type,
5192                                        unsigned int len);
5193
5194 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5195                                      struct nft_set *set,
5196                                      struct nft_set_elem *elem)
5197 {
5198         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5199         enum nft_registers dreg;
5200
5201         dreg = nft_type_to_reg(set->dtype);
5202         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5203                                            set->dtype == NFT_DATA_VERDICT ?
5204                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5205                                            set->dlen);
5206 }
5207
5208 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5209                                         struct nft_set *set,
5210                                         const struct nft_set_iter *iter,
5211                                         struct nft_set_elem *elem)
5212 {
5213         return nft_setelem_data_validate(ctx, set, elem);
5214 }
5215
5216 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5217                                        struct nft_set *set)
5218 {
5219         u8 genmask = nft_genmask_next(ctx->net);
5220         struct nft_set_elem_catchall *catchall;
5221         struct nft_set_elem elem;
5222         struct nft_set_ext *ext;
5223         int ret = 0;
5224
5225         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5226                 ext = nft_set_elem_ext(set, catchall->elem);
5227                 if (!nft_set_elem_active(ext, genmask))
5228                         continue;
5229
5230                 elem.priv = catchall->elem;
5231                 ret = nft_setelem_data_validate(ctx, set, &elem);
5232                 if (ret < 0)
5233                         break;
5234         }
5235
5236         return ret;
5237 }
5238
5239 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5240                        struct nft_set_binding *binding)
5241 {
5242         struct nft_set_binding *i;
5243         struct nft_set_iter iter;
5244
5245         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5246                 return -EBUSY;
5247
5248         if (binding->flags & NFT_SET_MAP) {
5249                 /* If the set is already bound to the same chain all
5250                  * jumps are already validated for that chain.
5251                  */
5252                 list_for_each_entry(i, &set->bindings, list) {
5253                         if (i->flags & NFT_SET_MAP &&
5254                             i->chain == binding->chain)
5255                                 goto bind;
5256                 }
5257
5258                 iter.genmask    = nft_genmask_next(ctx->net);
5259                 iter.skip       = 0;
5260                 iter.count      = 0;
5261                 iter.err        = 0;
5262                 iter.fn         = nf_tables_bind_check_setelem;
5263
5264                 set->ops->walk(ctx, set, &iter);
5265                 if (!iter.err)
5266                         iter.err = nft_set_catchall_bind_check(ctx, set);
5267
5268                 if (iter.err < 0)
5269                         return iter.err;
5270         }
5271 bind:
5272         if (!nft_use_inc(&set->use))
5273                 return -EMFILE;
5274
5275         binding->chain = ctx->chain;
5276         list_add_tail_rcu(&binding->list, &set->bindings);
5277         nft_set_trans_bind(ctx, set);
5278
5279         return 0;
5280 }
5281 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5282
5283 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5284                                  struct nft_set_binding *binding, bool event)
5285 {
5286         list_del_rcu(&binding->list);
5287
5288         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5289                 list_del_rcu(&set->list);
5290                 if (event)
5291                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5292                                              GFP_KERNEL);
5293         }
5294 }
5295
5296 static void nft_setelem_data_activate(const struct net *net,
5297                                       const struct nft_set *set,
5298                                       struct nft_set_elem *elem);
5299
5300 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5301                                 struct nft_set *set,
5302                                 const struct nft_set_iter *iter,
5303                                 struct nft_set_elem *elem)
5304 {
5305         nft_setelem_data_activate(ctx->net, set, elem);
5306
5307         return 0;
5308 }
5309
5310 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5311                                       struct nft_set *set)
5312 {
5313         u8 genmask = nft_genmask_next(ctx->net);
5314         struct nft_set_elem_catchall *catchall;
5315         struct nft_set_elem elem;
5316         struct nft_set_ext *ext;
5317
5318         list_for_each_entry(catchall, &set->catchall_list, list) {
5319                 ext = nft_set_elem_ext(set, catchall->elem);
5320                 if (!nft_set_elem_active(ext, genmask))
5321                         continue;
5322
5323                 elem.priv = catchall->elem;
5324                 nft_setelem_data_activate(ctx->net, set, &elem);
5325                 break;
5326         }
5327 }
5328
5329 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5330 {
5331         struct nft_set_iter iter = {
5332                 .genmask        = nft_genmask_next(ctx->net),
5333                 .fn             = nft_mapelem_activate,
5334         };
5335
5336         set->ops->walk(ctx, set, &iter);
5337         WARN_ON_ONCE(iter.err);
5338
5339         nft_map_catchall_activate(ctx, set);
5340 }
5341
5342 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5343 {
5344         if (nft_set_is_anonymous(set)) {
5345                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5346                         nft_map_activate(ctx, set);
5347
5348                 nft_clear(ctx->net, set);
5349         }
5350
5351         nft_use_inc_restore(&set->use);
5352 }
5353 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5354
5355 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5356                               struct nft_set_binding *binding,
5357                               enum nft_trans_phase phase)
5358 {
5359         switch (phase) {
5360         case NFT_TRANS_PREPARE_ERROR:
5361                 nft_set_trans_unbind(ctx, set);
5362                 if (nft_set_is_anonymous(set))
5363                         nft_deactivate_next(ctx->net, set);
5364                 else
5365                         list_del_rcu(&binding->list);
5366
5367                 nft_use_dec(&set->use);
5368                 break;
5369         case NFT_TRANS_PREPARE:
5370                 if (nft_set_is_anonymous(set)) {
5371                         if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5372                                 nft_map_deactivate(ctx, set);
5373
5374                         nft_deactivate_next(ctx->net, set);
5375                 }
5376                 nft_use_dec(&set->use);
5377                 return;
5378         case NFT_TRANS_ABORT:
5379         case NFT_TRANS_RELEASE:
5380                 if (nft_set_is_anonymous(set) &&
5381                     set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5382                         nft_map_deactivate(ctx, set);
5383
5384                 nft_use_dec(&set->use);
5385                 fallthrough;
5386         default:
5387                 nf_tables_unbind_set(ctx, set, binding,
5388                                      phase == NFT_TRANS_COMMIT);
5389         }
5390 }
5391 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5392
5393 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5394 {
5395         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5396                 nft_set_destroy(ctx, set);
5397 }
5398 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5399
5400 const struct nft_set_ext_type nft_set_ext_types[] = {
5401         [NFT_SET_EXT_KEY]               = {
5402                 .align  = __alignof__(u32),
5403         },
5404         [NFT_SET_EXT_DATA]              = {
5405                 .align  = __alignof__(u32),
5406         },
5407         [NFT_SET_EXT_EXPRESSIONS]       = {
5408                 .align  = __alignof__(struct nft_set_elem_expr),
5409         },
5410         [NFT_SET_EXT_OBJREF]            = {
5411                 .len    = sizeof(struct nft_object *),
5412                 .align  = __alignof__(struct nft_object *),
5413         },
5414         [NFT_SET_EXT_FLAGS]             = {
5415                 .len    = sizeof(u8),
5416                 .align  = __alignof__(u8),
5417         },
5418         [NFT_SET_EXT_TIMEOUT]           = {
5419                 .len    = sizeof(u64),
5420                 .align  = __alignof__(u64),
5421         },
5422         [NFT_SET_EXT_EXPIRATION]        = {
5423                 .len    = sizeof(u64),
5424                 .align  = __alignof__(u64),
5425         },
5426         [NFT_SET_EXT_USERDATA]          = {
5427                 .len    = sizeof(struct nft_userdata),
5428                 .align  = __alignof__(struct nft_userdata),
5429         },
5430         [NFT_SET_EXT_KEY_END]           = {
5431                 .align  = __alignof__(u32),
5432         },
5433 };
5434
5435 /*
5436  * Set elements
5437  */
5438
5439 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5440         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5441         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5442         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5443         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5444         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5445         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5446                                             .len = NFT_USERDATA_MAXLEN },
5447         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5448         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5449                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5450         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5451         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5452 };
5453
5454 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5455         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5456                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5457         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5458                                             .len = NFT_SET_MAXNAMELEN - 1 },
5459         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5460         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5461 };
5462
5463 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5464                                   const struct nft_set *set,
5465                                   const struct nft_set_ext *ext,
5466                                   bool reset)
5467 {
5468         struct nft_set_elem_expr *elem_expr;
5469         u32 size, num_exprs = 0;
5470         struct nft_expr *expr;
5471         struct nlattr *nest;
5472
5473         elem_expr = nft_set_ext_expr(ext);
5474         nft_setelem_expr_foreach(expr, elem_expr, size)
5475                 num_exprs++;
5476
5477         if (num_exprs == 1) {
5478                 expr = nft_setelem_expr_at(elem_expr, 0);
5479                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5480                         return -1;
5481
5482                 return 0;
5483         } else if (num_exprs > 1) {
5484                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5485                 if (nest == NULL)
5486                         goto nla_put_failure;
5487
5488                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5489                         expr = nft_setelem_expr_at(elem_expr, size);
5490                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5491                                 goto nla_put_failure;
5492                 }
5493                 nla_nest_end(skb, nest);
5494         }
5495         return 0;
5496
5497 nla_put_failure:
5498         return -1;
5499 }
5500
5501 static int nf_tables_fill_setelem(struct sk_buff *skb,
5502                                   const struct nft_set *set,
5503                                   const struct nft_set_elem *elem,
5504                                   bool reset)
5505 {
5506         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5507         unsigned char *b = skb_tail_pointer(skb);
5508         struct nlattr *nest;
5509         u64 timeout = 0;
5510
5511         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5512         if (nest == NULL)
5513                 goto nla_put_failure;
5514
5515         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5516             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5517                           NFT_DATA_VALUE, set->klen) < 0)
5518                 goto nla_put_failure;
5519
5520         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5521             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5522                           NFT_DATA_VALUE, set->klen) < 0)
5523                 goto nla_put_failure;
5524
5525         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5526             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5527                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5528                           set->dlen) < 0)
5529                 goto nla_put_failure;
5530
5531         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5532             nft_set_elem_expr_dump(skb, set, ext, reset))
5533                 goto nla_put_failure;
5534
5535         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5536             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5537                            (*nft_set_ext_obj(ext))->key.name) < 0)
5538                 goto nla_put_failure;
5539
5540         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5541             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5542                          htonl(*nft_set_ext_flags(ext))))
5543                 goto nla_put_failure;
5544
5545         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) {
5546                 timeout = *nft_set_ext_timeout(ext);
5547                 if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5548                                  nf_jiffies64_to_msecs(timeout),
5549                                  NFTA_SET_ELEM_PAD))
5550                         goto nla_put_failure;
5551         } else if (set->flags & NFT_SET_TIMEOUT) {
5552                 timeout = READ_ONCE(set->timeout);
5553         }
5554
5555         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5556                 u64 expires, now = get_jiffies_64();
5557
5558                 expires = *nft_set_ext_expiration(ext);
5559                 if (time_before64(now, expires))
5560                         expires -= now;
5561                 else
5562                         expires = 0;
5563
5564                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5565                                  nf_jiffies64_to_msecs(expires),
5566                                  NFTA_SET_ELEM_PAD))
5567                         goto nla_put_failure;
5568
5569                 if (reset)
5570                         *nft_set_ext_expiration(ext) = now + timeout;
5571         }
5572
5573         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5574                 struct nft_userdata *udata;
5575
5576                 udata = nft_set_ext_userdata(ext);
5577                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5578                             udata->len + 1, udata->data))
5579                         goto nla_put_failure;
5580         }
5581
5582         nla_nest_end(skb, nest);
5583         return 0;
5584
5585 nla_put_failure:
5586         nlmsg_trim(skb, b);
5587         return -EMSGSIZE;
5588 }
5589
5590 struct nft_set_dump_args {
5591         const struct netlink_callback   *cb;
5592         struct nft_set_iter             iter;
5593         struct sk_buff                  *skb;
5594         bool                            reset;
5595 };
5596
5597 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5598                                   struct nft_set *set,
5599                                   const struct nft_set_iter *iter,
5600                                   struct nft_set_elem *elem)
5601 {
5602         struct nft_set_dump_args *args;
5603
5604         args = container_of(iter, struct nft_set_dump_args, iter);
5605         return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5606 }
5607
5608 struct nft_set_dump_ctx {
5609         const struct nft_set    *set;
5610         struct nft_ctx          ctx;
5611 };
5612
5613 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5614                                  const struct nft_set *set, bool reset)
5615 {
5616         struct nft_set_elem_catchall *catchall;
5617         u8 genmask = nft_genmask_cur(net);
5618         struct nft_set_elem elem;
5619         struct nft_set_ext *ext;
5620         int ret = 0;
5621
5622         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5623                 ext = nft_set_elem_ext(set, catchall->elem);
5624                 if (!nft_set_elem_active(ext, genmask) ||
5625                     nft_set_elem_expired(ext))
5626                         continue;
5627
5628                 elem.priv = catchall->elem;
5629                 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5630                 break;
5631         }
5632
5633         return ret;
5634 }
5635
5636 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5637 {
5638         struct nft_set_dump_ctx *dump_ctx = cb->data;
5639         struct net *net = sock_net(skb->sk);
5640         struct nftables_pernet *nft_net;
5641         struct nft_table *table;
5642         struct nft_set *set;
5643         struct nft_set_dump_args args;
5644         bool set_found = false;
5645         struct nlmsghdr *nlh;
5646         struct nlattr *nest;
5647         bool reset = false;
5648         u32 portid, seq;
5649         int event;
5650
5651         rcu_read_lock();
5652         nft_net = nft_pernet(net);
5653         cb->seq = READ_ONCE(nft_net->base_seq);
5654
5655         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5656                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5657                     dump_ctx->ctx.family != table->family)
5658                         continue;
5659
5660                 if (table != dump_ctx->ctx.table)
5661                         continue;
5662
5663                 list_for_each_entry_rcu(set, &table->sets, list) {
5664                         if (set == dump_ctx->set) {
5665                                 set_found = true;
5666                                 break;
5667                         }
5668                 }
5669                 break;
5670         }
5671
5672         if (!set_found) {
5673                 rcu_read_unlock();
5674                 return -ENOENT;
5675         }
5676
5677         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5678         portid = NETLINK_CB(cb->skb).portid;
5679         seq    = cb->nlh->nlmsg_seq;
5680
5681         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5682                            table->family, NFNETLINK_V0, nft_base_seq(net));
5683         if (!nlh)
5684                 goto nla_put_failure;
5685
5686         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5687                 goto nla_put_failure;
5688         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5689                 goto nla_put_failure;
5690
5691         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5692         if (nest == NULL)
5693                 goto nla_put_failure;
5694
5695         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5696                 reset = true;
5697
5698         args.cb                 = cb;
5699         args.skb                = skb;
5700         args.reset              = reset;
5701         args.iter.genmask       = nft_genmask_cur(net);
5702         args.iter.skip          = cb->args[0];
5703         args.iter.count         = 0;
5704         args.iter.err           = 0;
5705         args.iter.fn            = nf_tables_dump_setelem;
5706         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5707
5708         if (!args.iter.err && args.iter.count == cb->args[0])
5709                 args.iter.err = nft_set_catchall_dump(net, skb, set, reset);
5710         rcu_read_unlock();
5711
5712         nla_nest_end(skb, nest);
5713         nlmsg_end(skb, nlh);
5714
5715         if (args.iter.err && args.iter.err != -EMSGSIZE)
5716                 return args.iter.err;
5717         if (args.iter.count == cb->args[0])
5718                 return 0;
5719
5720         cb->args[0] = args.iter.count;
5721         return skb->len;
5722
5723 nla_put_failure:
5724         rcu_read_unlock();
5725         return -ENOSPC;
5726 }
5727
5728 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5729 {
5730         struct nft_set_dump_ctx *dump_ctx = cb->data;
5731
5732         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5733
5734         return cb->data ? 0 : -ENOMEM;
5735 }
5736
5737 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5738 {
5739         kfree(cb->data);
5740         return 0;
5741 }
5742
5743 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5744                                        const struct nft_ctx *ctx, u32 seq,
5745                                        u32 portid, int event, u16 flags,
5746                                        const struct nft_set *set,
5747                                        const struct nft_set_elem *elem,
5748                                        bool reset)
5749 {
5750         struct nlmsghdr *nlh;
5751         struct nlattr *nest;
5752         int err;
5753
5754         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5755         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5756                            NFNETLINK_V0, nft_base_seq(ctx->net));
5757         if (!nlh)
5758                 goto nla_put_failure;
5759
5760         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5761                 goto nla_put_failure;
5762         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5763                 goto nla_put_failure;
5764
5765         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5766         if (nest == NULL)
5767                 goto nla_put_failure;
5768
5769         err = nf_tables_fill_setelem(skb, set, elem, reset);
5770         if (err < 0)
5771                 goto nla_put_failure;
5772
5773         nla_nest_end(skb, nest);
5774
5775         nlmsg_end(skb, nlh);
5776         return 0;
5777
5778 nla_put_failure:
5779         nlmsg_trim(skb, nlh);
5780         return -1;
5781 }
5782
5783 static int nft_setelem_parse_flags(const struct nft_set *set,
5784                                    const struct nlattr *attr, u32 *flags)
5785 {
5786         if (attr == NULL)
5787                 return 0;
5788
5789         *flags = ntohl(nla_get_be32(attr));
5790         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5791                 return -EOPNOTSUPP;
5792         if (!(set->flags & NFT_SET_INTERVAL) &&
5793             *flags & NFT_SET_ELEM_INTERVAL_END)
5794                 return -EINVAL;
5795         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5796             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5797                 return -EINVAL;
5798
5799         return 0;
5800 }
5801
5802 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5803                                  struct nft_data *key, struct nlattr *attr)
5804 {
5805         struct nft_data_desc desc = {
5806                 .type   = NFT_DATA_VALUE,
5807                 .size   = NFT_DATA_VALUE_MAXLEN,
5808                 .len    = set->klen,
5809         };
5810
5811         return nft_data_init(ctx, key, &desc, attr);
5812 }
5813
5814 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5815                                   struct nft_data_desc *desc,
5816                                   struct nft_data *data,
5817                                   struct nlattr *attr)
5818 {
5819         u32 dtype;
5820
5821         if (set->dtype == NFT_DATA_VERDICT)
5822                 dtype = NFT_DATA_VERDICT;
5823         else
5824                 dtype = NFT_DATA_VALUE;
5825
5826         desc->type = dtype;
5827         desc->size = NFT_DATA_VALUE_MAXLEN;
5828         desc->len = set->dlen;
5829         desc->flags = NFT_DATA_DESC_SETELEM;
5830
5831         return nft_data_init(ctx, data, desc, attr);
5832 }
5833
5834 static void *nft_setelem_catchall_get(const struct net *net,
5835                                       const struct nft_set *set)
5836 {
5837         struct nft_set_elem_catchall *catchall;
5838         u8 genmask = nft_genmask_cur(net);
5839         struct nft_set_ext *ext;
5840         void *priv = NULL;
5841
5842         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5843                 ext = nft_set_elem_ext(set, catchall->elem);
5844                 if (!nft_set_elem_active(ext, genmask) ||
5845                     nft_set_elem_expired(ext))
5846                         continue;
5847
5848                 priv = catchall->elem;
5849                 break;
5850         }
5851
5852         return priv;
5853 }
5854
5855 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5856                            struct nft_set_elem *elem, u32 flags)
5857 {
5858         void *priv;
5859
5860         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5861                 priv = set->ops->get(ctx->net, set, elem, flags);
5862                 if (IS_ERR(priv))
5863                         return PTR_ERR(priv);
5864         } else {
5865                 priv = nft_setelem_catchall_get(ctx->net, set);
5866                 if (!priv)
5867                         return -ENOENT;
5868         }
5869         elem->priv = priv;
5870
5871         return 0;
5872 }
5873
5874 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5875                             const struct nlattr *attr, bool reset)
5876 {
5877         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5878         struct nft_set_elem elem;
5879         struct sk_buff *skb;
5880         uint32_t flags = 0;
5881         int err;
5882
5883         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5884                                           nft_set_elem_policy, NULL);
5885         if (err < 0)
5886                 return err;
5887
5888         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5889         if (err < 0)
5890                 return err;
5891
5892         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5893                 return -EINVAL;
5894
5895         if (nla[NFTA_SET_ELEM_KEY]) {
5896                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5897                                             nla[NFTA_SET_ELEM_KEY]);
5898                 if (err < 0)
5899                         return err;
5900         }
5901
5902         if (nla[NFTA_SET_ELEM_KEY_END]) {
5903                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5904                                             nla[NFTA_SET_ELEM_KEY_END]);
5905                 if (err < 0)
5906                         return err;
5907         }
5908
5909         err = nft_setelem_get(ctx, set, &elem, flags);
5910         if (err < 0)
5911                 return err;
5912
5913         err = -ENOMEM;
5914         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5915         if (skb == NULL)
5916                 return err;
5917
5918         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5919                                           NFT_MSG_NEWSETELEM, 0, set, &elem,
5920                                           reset);
5921         if (err < 0)
5922                 goto err_fill_setelem;
5923
5924         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5925
5926 err_fill_setelem:
5927         kfree_skb(skb);
5928         return err;
5929 }
5930
5931 /* called with rcu_read_lock held */
5932 static int nf_tables_getsetelem(struct sk_buff *skb,
5933                                 const struct nfnl_info *info,
5934                                 const struct nlattr * const nla[])
5935 {
5936         struct netlink_ext_ack *extack = info->extack;
5937         u8 genmask = nft_genmask_cur(info->net);
5938         u8 family = info->nfmsg->nfgen_family;
5939         struct net *net = info->net;
5940         struct nft_table *table;
5941         struct nft_set *set;
5942         struct nlattr *attr;
5943         struct nft_ctx ctx;
5944         bool reset = false;
5945         int rem, err = 0;
5946
5947         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5948                                  genmask, 0);
5949         if (IS_ERR(table)) {
5950                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5951                 return PTR_ERR(table);
5952         }
5953
5954         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5955         if (IS_ERR(set))
5956                 return PTR_ERR(set);
5957
5958         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5959
5960         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5961                 struct netlink_dump_control c = {
5962                         .start = nf_tables_dump_set_start,
5963                         .dump = nf_tables_dump_set,
5964                         .done = nf_tables_dump_set_done,
5965                         .module = THIS_MODULE,
5966                 };
5967                 struct nft_set_dump_ctx dump_ctx = {
5968                         .set = set,
5969                         .ctx = ctx,
5970                 };
5971
5972                 c.data = &dump_ctx;
5973                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5974         }
5975
5976         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5977                 return -EINVAL;
5978
5979         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5980                 reset = true;
5981
5982         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5983                 err = nft_get_set_elem(&ctx, set, attr, reset);
5984                 if (err < 0) {
5985                         NL_SET_BAD_ATTR(extack, attr);
5986                         break;
5987                 }
5988         }
5989
5990         return err;
5991 }
5992
5993 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5994                                      const struct nft_set *set,
5995                                      const struct nft_set_elem *elem,
5996                                      int event)
5997 {
5998         struct nftables_pernet *nft_net;
5999         struct net *net = ctx->net;
6000         u32 portid = ctx->portid;
6001         struct sk_buff *skb;
6002         u16 flags = 0;
6003         int err;
6004
6005         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6006                 return;
6007
6008         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6009         if (skb == NULL)
6010                 goto err;
6011
6012         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6013                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6014
6015         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6016                                           set, elem, false);
6017         if (err < 0) {
6018                 kfree_skb(skb);
6019                 goto err;
6020         }
6021
6022         nft_net = nft_pernet(net);
6023         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6024         return;
6025 err:
6026         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6027 }
6028
6029 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6030                                               int msg_type,
6031                                               struct nft_set *set)
6032 {
6033         struct nft_trans *trans;
6034
6035         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6036         if (trans == NULL)
6037                 return NULL;
6038
6039         nft_trans_elem_set(trans) = set;
6040         return trans;
6041 }
6042
6043 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6044                                          const struct nft_set *set,
6045                                          const struct nlattr *attr)
6046 {
6047         struct nft_expr *expr;
6048         int err;
6049
6050         expr = nft_expr_init(ctx, attr);
6051         if (IS_ERR(expr))
6052                 return expr;
6053
6054         err = -EOPNOTSUPP;
6055         if (expr->ops->type->flags & NFT_EXPR_GC) {
6056                 if (set->flags & NFT_SET_TIMEOUT)
6057                         goto err_set_elem_expr;
6058                 if (!set->ops->gc_init)
6059                         goto err_set_elem_expr;
6060                 set->ops->gc_init(set);
6061         }
6062
6063         return expr;
6064
6065 err_set_elem_expr:
6066         nft_expr_destroy(ctx, expr);
6067         return ERR_PTR(err);
6068 }
6069
6070 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6071 {
6072         len += nft_set_ext_types[id].len;
6073         if (len > tmpl->ext_len[id] ||
6074             len > U8_MAX)
6075                 return -1;
6076
6077         return 0;
6078 }
6079
6080 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6081                               void *to, const void *from, u32 len)
6082 {
6083         if (nft_set_ext_check(tmpl, id, len) < 0)
6084                 return -1;
6085
6086         memcpy(to, from, len);
6087
6088         return 0;
6089 }
6090
6091 void *nft_set_elem_init(const struct nft_set *set,
6092                         const struct nft_set_ext_tmpl *tmpl,
6093                         const u32 *key, const u32 *key_end,
6094                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6095 {
6096         struct nft_set_ext *ext;
6097         void *elem;
6098
6099         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6100         if (elem == NULL)
6101                 return ERR_PTR(-ENOMEM);
6102
6103         ext = nft_set_elem_ext(set, elem);
6104         nft_set_ext_init(ext, tmpl);
6105
6106         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6107             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6108                                nft_set_ext_key(ext), key, set->klen) < 0)
6109                 goto err_ext_check;
6110
6111         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6112             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6113                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6114                 goto err_ext_check;
6115
6116         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6117             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6118                                nft_set_ext_data(ext), data, set->dlen) < 0)
6119                 goto err_ext_check;
6120
6121         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6122                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6123                 if (expiration == 0)
6124                         *nft_set_ext_expiration(ext) += timeout;
6125         }
6126         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6127                 *nft_set_ext_timeout(ext) = timeout;
6128
6129         return elem;
6130
6131 err_ext_check:
6132         kfree(elem);
6133
6134         return ERR_PTR(-EINVAL);
6135 }
6136
6137 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6138                                         struct nft_expr *expr)
6139 {
6140         if (expr->ops->destroy_clone) {
6141                 expr->ops->destroy_clone(ctx, expr);
6142                 module_put(expr->ops->type->owner);
6143         } else {
6144                 nf_tables_expr_destroy(ctx, expr);
6145         }
6146 }
6147
6148 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6149                                       struct nft_set_elem_expr *elem_expr)
6150 {
6151         struct nft_expr *expr;
6152         u32 size;
6153
6154         nft_setelem_expr_foreach(expr, elem_expr, size)
6155                 __nft_set_elem_expr_destroy(ctx, expr);
6156 }
6157
6158 /* Drop references and destroy. Called from gc, dynset and abort path. */
6159 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6160                           bool destroy_expr)
6161 {
6162         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6163         struct nft_ctx ctx = {
6164                 .net    = read_pnet(&set->net),
6165                 .family = set->table->family,
6166         };
6167
6168         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6169         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6170                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6171         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6172                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6173
6174         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6175                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6176         kfree(elem);
6177 }
6178 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6179
6180 /* Destroy element. References have been already dropped in the preparation
6181  * path via nft_setelem_data_deactivate().
6182  */
6183 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6184                                 const struct nft_set *set, void *elem)
6185 {
6186         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6187
6188         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6189                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6190
6191         kfree(elem);
6192 }
6193
6194 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6195                             struct nft_expr *expr_array[])
6196 {
6197         struct nft_expr *expr;
6198         int err, i, k;
6199
6200         for (i = 0; i < set->num_exprs; i++) {
6201                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6202                 if (!expr)
6203                         goto err_expr;
6204
6205                 err = nft_expr_clone(expr, set->exprs[i]);
6206                 if (err < 0) {
6207                         kfree(expr);
6208                         goto err_expr;
6209                 }
6210                 expr_array[i] = expr;
6211         }
6212
6213         return 0;
6214
6215 err_expr:
6216         for (k = i - 1; k >= 0; k--)
6217                 nft_expr_destroy(ctx, expr_array[k]);
6218
6219         return -ENOMEM;
6220 }
6221
6222 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6223                                    const struct nft_set_ext_tmpl *tmpl,
6224                                    const struct nft_set_ext *ext,
6225                                    struct nft_expr *expr_array[],
6226                                    u32 num_exprs)
6227 {
6228         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6229         u32 len = sizeof(struct nft_set_elem_expr);
6230         struct nft_expr *expr;
6231         int i, err;
6232
6233         if (num_exprs == 0)
6234                 return 0;
6235
6236         for (i = 0; i < num_exprs; i++)
6237                 len += expr_array[i]->ops->size;
6238
6239         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6240                 return -EINVAL;
6241
6242         for (i = 0; i < num_exprs; i++) {
6243                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6244                 err = nft_expr_clone(expr, expr_array[i]);
6245                 if (err < 0)
6246                         goto err_elem_expr_setup;
6247
6248                 elem_expr->size += expr_array[i]->ops->size;
6249                 nft_expr_destroy(ctx, expr_array[i]);
6250                 expr_array[i] = NULL;
6251         }
6252
6253         return 0;
6254
6255 err_elem_expr_setup:
6256         for (; i < num_exprs; i++) {
6257                 nft_expr_destroy(ctx, expr_array[i]);
6258                 expr_array[i] = NULL;
6259         }
6260
6261         return -ENOMEM;
6262 }
6263
6264 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6265                                             const struct nft_set *set)
6266 {
6267         struct nft_set_elem_catchall *catchall;
6268         u8 genmask = nft_genmask_cur(net);
6269         struct nft_set_ext *ext;
6270
6271         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6272                 ext = nft_set_elem_ext(set, catchall->elem);
6273                 if (nft_set_elem_active(ext, genmask) &&
6274                     !nft_set_elem_expired(ext))
6275                         return ext;
6276         }
6277
6278         return NULL;
6279 }
6280 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6281
6282 void *nft_set_catchall_gc(const struct nft_set *set)
6283 {
6284         struct nft_set_elem_catchall *catchall, *next;
6285         struct nft_set_ext *ext;
6286         void *elem = NULL;
6287
6288         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6289                 ext = nft_set_elem_ext(set, catchall->elem);
6290
6291                 if (!nft_set_elem_expired(ext) ||
6292                     nft_set_elem_mark_busy(ext))
6293                         continue;
6294
6295                 elem = catchall->elem;
6296                 list_del_rcu(&catchall->list);
6297                 kfree_rcu(catchall, rcu);
6298                 break;
6299         }
6300
6301         return elem;
6302 }
6303 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6304
6305 static int nft_setelem_catchall_insert(const struct net *net,
6306                                        struct nft_set *set,
6307                                        const struct nft_set_elem *elem,
6308                                        struct nft_set_ext **pext)
6309 {
6310         struct nft_set_elem_catchall *catchall;
6311         u8 genmask = nft_genmask_next(net);
6312         struct nft_set_ext *ext;
6313
6314         list_for_each_entry(catchall, &set->catchall_list, list) {
6315                 ext = nft_set_elem_ext(set, catchall->elem);
6316                 if (nft_set_elem_active(ext, genmask)) {
6317                         *pext = ext;
6318                         return -EEXIST;
6319                 }
6320         }
6321
6322         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6323         if (!catchall)
6324                 return -ENOMEM;
6325
6326         catchall->elem = elem->priv;
6327         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6328
6329         return 0;
6330 }
6331
6332 static int nft_setelem_insert(const struct net *net,
6333                               struct nft_set *set,
6334                               const struct nft_set_elem *elem,
6335                               struct nft_set_ext **ext, unsigned int flags)
6336 {
6337         int ret;
6338
6339         if (flags & NFT_SET_ELEM_CATCHALL)
6340                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6341         else
6342                 ret = set->ops->insert(net, set, elem, ext);
6343
6344         return ret;
6345 }
6346
6347 static bool nft_setelem_is_catchall(const struct nft_set *set,
6348                                     const struct nft_set_elem *elem)
6349 {
6350         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6351
6352         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6353             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6354                 return true;
6355
6356         return false;
6357 }
6358
6359 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6360                                  struct nft_set_elem *elem)
6361 {
6362         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6363
6364         if (nft_setelem_is_catchall(set, elem)) {
6365                 nft_set_elem_change_active(net, set, ext);
6366                 nft_set_elem_clear_busy(ext);
6367         } else {
6368                 set->ops->activate(net, set, elem);
6369         }
6370 }
6371
6372 static int nft_setelem_catchall_deactivate(const struct net *net,
6373                                            struct nft_set *set,
6374                                            struct nft_set_elem *elem)
6375 {
6376         struct nft_set_elem_catchall *catchall;
6377         struct nft_set_ext *ext;
6378
6379         list_for_each_entry(catchall, &set->catchall_list, list) {
6380                 ext = nft_set_elem_ext(set, catchall->elem);
6381                 if (!nft_is_active(net, ext) ||
6382                     nft_set_elem_mark_busy(ext))
6383                         continue;
6384
6385                 kfree(elem->priv);
6386                 elem->priv = catchall->elem;
6387                 nft_set_elem_change_active(net, set, ext);
6388                 return 0;
6389         }
6390
6391         return -ENOENT;
6392 }
6393
6394 static int __nft_setelem_deactivate(const struct net *net,
6395                                     struct nft_set *set,
6396                                     struct nft_set_elem *elem)
6397 {
6398         void *priv;
6399
6400         priv = set->ops->deactivate(net, set, elem);
6401         if (!priv)
6402                 return -ENOENT;
6403
6404         kfree(elem->priv);
6405         elem->priv = priv;
6406         set->ndeact++;
6407
6408         return 0;
6409 }
6410
6411 static int nft_setelem_deactivate(const struct net *net,
6412                                   struct nft_set *set,
6413                                   struct nft_set_elem *elem, u32 flags)
6414 {
6415         int ret;
6416
6417         if (flags & NFT_SET_ELEM_CATCHALL)
6418                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6419         else
6420                 ret = __nft_setelem_deactivate(net, set, elem);
6421
6422         return ret;
6423 }
6424
6425 static void nft_setelem_catchall_remove(const struct net *net,
6426                                         const struct nft_set *set,
6427                                         const struct nft_set_elem *elem)
6428 {
6429         struct nft_set_elem_catchall *catchall, *next;
6430
6431         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6432                 if (catchall->elem == elem->priv) {
6433                         list_del_rcu(&catchall->list);
6434                         kfree_rcu(catchall, rcu);
6435                         break;
6436                 }
6437         }
6438 }
6439
6440 static void nft_setelem_remove(const struct net *net,
6441                                const struct nft_set *set,
6442                                const struct nft_set_elem *elem)
6443 {
6444         if (nft_setelem_is_catchall(set, elem))
6445                 nft_setelem_catchall_remove(net, set, elem);
6446         else
6447                 set->ops->remove(net, set, elem);
6448 }
6449
6450 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6451                                       struct nlattr **nla, u32 flags)
6452 {
6453         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6454                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6455                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6456                         return false;
6457
6458                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6459                     flags & NFT_SET_ELEM_CATCHALL)
6460                         return false;
6461         } else {
6462                 if (nla[NFTA_SET_ELEM_KEY_END])
6463                         return false;
6464         }
6465
6466         return true;
6467 }
6468
6469 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6470                             const struct nlattr *attr, u32 nlmsg_flags)
6471 {
6472         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6473         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6474         u8 genmask = nft_genmask_next(ctx->net);
6475         u32 flags = 0, size = 0, num_exprs = 0;
6476         struct nft_set_ext_tmpl tmpl;
6477         struct nft_set_ext *ext, *ext2;
6478         struct nft_set_elem elem;
6479         struct nft_set_binding *binding;
6480         struct nft_object *obj = NULL;
6481         struct nft_userdata *udata;
6482         struct nft_data_desc desc;
6483         enum nft_registers dreg;
6484         struct nft_trans *trans;
6485         u64 timeout;
6486         u64 expiration;
6487         int err, i;
6488         u8 ulen;
6489
6490         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6491                                           nft_set_elem_policy, NULL);
6492         if (err < 0)
6493                 return err;
6494
6495         nft_set_ext_prepare(&tmpl);
6496
6497         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6498         if (err < 0)
6499                 return err;
6500
6501         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6502             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6503                 return -EINVAL;
6504
6505         if (flags != 0) {
6506                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6507                 if (err < 0)
6508                         return err;
6509         }
6510
6511         if (set->flags & NFT_SET_MAP) {
6512                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6513                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6514                         return -EINVAL;
6515         } else {
6516                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6517                         return -EINVAL;
6518         }
6519
6520         if (set->flags & NFT_SET_OBJECT) {
6521                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6522                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6523                         return -EINVAL;
6524         } else {
6525                 if (nla[NFTA_SET_ELEM_OBJREF])
6526                         return -EINVAL;
6527         }
6528
6529         if (!nft_setelem_valid_key_end(set, nla, flags))
6530                 return -EINVAL;
6531
6532         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6533              (nla[NFTA_SET_ELEM_DATA] ||
6534               nla[NFTA_SET_ELEM_OBJREF] ||
6535               nla[NFTA_SET_ELEM_TIMEOUT] ||
6536               nla[NFTA_SET_ELEM_EXPIRATION] ||
6537               nla[NFTA_SET_ELEM_USERDATA] ||
6538               nla[NFTA_SET_ELEM_EXPR] ||
6539               nla[NFTA_SET_ELEM_KEY_END] ||
6540               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6541                 return -EINVAL;
6542
6543         timeout = 0;
6544         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6545                 if (!(set->flags & NFT_SET_TIMEOUT))
6546                         return -EINVAL;
6547                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6548                                             &timeout);
6549                 if (err)
6550                         return err;
6551         } else if (set->flags & NFT_SET_TIMEOUT &&
6552                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6553                 timeout = READ_ONCE(set->timeout);
6554         }
6555
6556         expiration = 0;
6557         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6558                 if (!(set->flags & NFT_SET_TIMEOUT))
6559                         return -EINVAL;
6560                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6561                                             &expiration);
6562                 if (err)
6563                         return err;
6564         }
6565
6566         if (nla[NFTA_SET_ELEM_EXPR]) {
6567                 struct nft_expr *expr;
6568
6569                 if (set->num_exprs && set->num_exprs != 1)
6570                         return -EOPNOTSUPP;
6571
6572                 expr = nft_set_elem_expr_alloc(ctx, set,
6573                                                nla[NFTA_SET_ELEM_EXPR]);
6574                 if (IS_ERR(expr))
6575                         return PTR_ERR(expr);
6576
6577                 expr_array[0] = expr;
6578                 num_exprs = 1;
6579
6580                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6581                         err = -EOPNOTSUPP;
6582                         goto err_set_elem_expr;
6583                 }
6584         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6585                 struct nft_expr *expr;
6586                 struct nlattr *tmp;
6587                 int left;
6588
6589                 i = 0;
6590                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6591                         if (i == NFT_SET_EXPR_MAX ||
6592                             (set->num_exprs && set->num_exprs == i)) {
6593                                 err = -E2BIG;
6594                                 goto err_set_elem_expr;
6595                         }
6596                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6597                                 err = -EINVAL;
6598                                 goto err_set_elem_expr;
6599                         }
6600                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6601                         if (IS_ERR(expr)) {
6602                                 err = PTR_ERR(expr);
6603                                 goto err_set_elem_expr;
6604                         }
6605                         expr_array[i] = expr;
6606                         num_exprs++;
6607
6608                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6609                                 err = -EOPNOTSUPP;
6610                                 goto err_set_elem_expr;
6611                         }
6612                         i++;
6613                 }
6614                 if (set->num_exprs && set->num_exprs != i) {
6615                         err = -EOPNOTSUPP;
6616                         goto err_set_elem_expr;
6617                 }
6618         } else if (set->num_exprs > 0 &&
6619                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6620                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6621                 if (err < 0)
6622                         goto err_set_elem_expr_clone;
6623
6624                 num_exprs = set->num_exprs;
6625         }
6626
6627         if (nla[NFTA_SET_ELEM_KEY]) {
6628                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6629                                             nla[NFTA_SET_ELEM_KEY]);
6630                 if (err < 0)
6631                         goto err_set_elem_expr;
6632
6633                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6634                 if (err < 0)
6635                         goto err_parse_key;
6636         }
6637
6638         if (nla[NFTA_SET_ELEM_KEY_END]) {
6639                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6640                                             nla[NFTA_SET_ELEM_KEY_END]);
6641                 if (err < 0)
6642                         goto err_parse_key;
6643
6644                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6645                 if (err < 0)
6646                         goto err_parse_key_end;
6647         }
6648
6649         if (timeout > 0) {
6650                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6651                 if (err < 0)
6652                         goto err_parse_key_end;
6653
6654                 if (timeout != READ_ONCE(set->timeout)) {
6655                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6656                         if (err < 0)
6657                                 goto err_parse_key_end;
6658                 }
6659         }
6660
6661         if (num_exprs) {
6662                 for (i = 0; i < num_exprs; i++)
6663                         size += expr_array[i]->ops->size;
6664
6665                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6666                                              sizeof(struct nft_set_elem_expr) + size);
6667                 if (err < 0)
6668                         goto err_parse_key_end;
6669         }
6670
6671         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6672                 obj = nft_obj_lookup(ctx->net, ctx->table,
6673                                      nla[NFTA_SET_ELEM_OBJREF],
6674                                      set->objtype, genmask);
6675                 if (IS_ERR(obj)) {
6676                         err = PTR_ERR(obj);
6677                         obj = NULL;
6678                         goto err_parse_key_end;
6679                 }
6680
6681                 if (!nft_use_inc(&obj->use)) {
6682                         err = -EMFILE;
6683                         obj = NULL;
6684                         goto err_parse_key_end;
6685                 }
6686
6687                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6688                 if (err < 0)
6689                         goto err_parse_key_end;
6690         }
6691
6692         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6693                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6694                                              nla[NFTA_SET_ELEM_DATA]);
6695                 if (err < 0)
6696                         goto err_parse_key_end;
6697
6698                 dreg = nft_type_to_reg(set->dtype);
6699                 list_for_each_entry(binding, &set->bindings, list) {
6700                         struct nft_ctx bind_ctx = {
6701                                 .net    = ctx->net,
6702                                 .family = ctx->family,
6703                                 .table  = ctx->table,
6704                                 .chain  = (struct nft_chain *)binding->chain,
6705                         };
6706
6707                         if (!(binding->flags & NFT_SET_MAP))
6708                                 continue;
6709
6710                         err = nft_validate_register_store(&bind_ctx, dreg,
6711                                                           &elem.data.val,
6712                                                           desc.type, desc.len);
6713                         if (err < 0)
6714                                 goto err_parse_data;
6715
6716                         if (desc.type == NFT_DATA_VERDICT &&
6717                             (elem.data.val.verdict.code == NFT_GOTO ||
6718                              elem.data.val.verdict.code == NFT_JUMP))
6719                                 nft_validate_state_update(ctx->table,
6720                                                           NFT_VALIDATE_NEED);
6721                 }
6722
6723                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6724                 if (err < 0)
6725                         goto err_parse_data;
6726         }
6727
6728         /* The full maximum length of userdata can exceed the maximum
6729          * offset value (U8_MAX) for following extensions, therefor it
6730          * must be the last extension added.
6731          */
6732         ulen = 0;
6733         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6734                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6735                 if (ulen > 0) {
6736                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6737                                                      ulen);
6738                         if (err < 0)
6739                                 goto err_parse_data;
6740                 }
6741         }
6742
6743         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6744                                       elem.key_end.val.data, elem.data.val.data,
6745                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6746         if (IS_ERR(elem.priv)) {
6747                 err = PTR_ERR(elem.priv);
6748                 goto err_parse_data;
6749         }
6750
6751         ext = nft_set_elem_ext(set, elem.priv);
6752         if (flags)
6753                 *nft_set_ext_flags(ext) = flags;
6754
6755         if (obj)
6756                 *nft_set_ext_obj(ext) = obj;
6757
6758         if (ulen > 0) {
6759                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6760                         err = -EINVAL;
6761                         goto err_elem_free;
6762                 }
6763                 udata = nft_set_ext_userdata(ext);
6764                 udata->len = ulen - 1;
6765                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6766         }
6767         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6768         if (err < 0)
6769                 goto err_elem_free;
6770
6771         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6772         if (trans == NULL) {
6773                 err = -ENOMEM;
6774                 goto err_elem_free;
6775         }
6776
6777         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6778
6779         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6780         if (err) {
6781                 if (err == -EEXIST) {
6782                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6783                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6784                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6785                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6786                                 goto err_element_clash;
6787                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6788                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6789                              memcmp(nft_set_ext_data(ext),
6790                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6791                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6792                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6793                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6794                                 goto err_element_clash;
6795                         else if (!(nlmsg_flags & NLM_F_EXCL))
6796                                 err = 0;
6797                 } else if (err == -ENOTEMPTY) {
6798                         /* ENOTEMPTY reports overlapping between this element
6799                          * and an existing one.
6800                          */
6801                         err = -EEXIST;
6802                 }
6803                 goto err_element_clash;
6804         }
6805
6806         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6807                 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6808
6809                 if (!atomic_add_unless(&set->nelems, 1, max)) {
6810                         err = -ENFILE;
6811                         goto err_set_full;
6812                 }
6813         }
6814
6815         nft_trans_elem(trans) = elem;
6816         nft_trans_commit_list_add_tail(ctx->net, trans);
6817         return 0;
6818
6819 err_set_full:
6820         nft_setelem_remove(ctx->net, set, &elem);
6821 err_element_clash:
6822         kfree(trans);
6823 err_elem_free:
6824         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6825 err_parse_data:
6826         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6827                 nft_data_release(&elem.data.val, desc.type);
6828 err_parse_key_end:
6829         if (obj)
6830                 nft_use_dec_restore(&obj->use);
6831
6832         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6833 err_parse_key:
6834         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6835 err_set_elem_expr:
6836         for (i = 0; i < num_exprs && expr_array[i]; i++)
6837                 nft_expr_destroy(ctx, expr_array[i]);
6838 err_set_elem_expr_clone:
6839         return err;
6840 }
6841
6842 static int nf_tables_newsetelem(struct sk_buff *skb,
6843                                 const struct nfnl_info *info,
6844                                 const struct nlattr * const nla[])
6845 {
6846         struct netlink_ext_ack *extack = info->extack;
6847         u8 genmask = nft_genmask_next(info->net);
6848         u8 family = info->nfmsg->nfgen_family;
6849         struct net *net = info->net;
6850         const struct nlattr *attr;
6851         struct nft_table *table;
6852         struct nft_set *set;
6853         struct nft_ctx ctx;
6854         int rem, err;
6855
6856         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6857                 return -EINVAL;
6858
6859         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6860                                  genmask, NETLINK_CB(skb).portid);
6861         if (IS_ERR(table)) {
6862                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6863                 return PTR_ERR(table);
6864         }
6865
6866         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6867                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6868         if (IS_ERR(set))
6869                 return PTR_ERR(set);
6870
6871         if (!list_empty(&set->bindings) &&
6872             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6873                 return -EBUSY;
6874
6875         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6876
6877         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6878                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6879                 if (err < 0) {
6880                         NL_SET_BAD_ATTR(extack, attr);
6881                         return err;
6882                 }
6883         }
6884
6885         if (table->validate_state == NFT_VALIDATE_DO)
6886                 return nft_table_validate(net, table);
6887
6888         return 0;
6889 }
6890
6891 /**
6892  *      nft_data_hold - hold a nft_data item
6893  *
6894  *      @data: struct nft_data to release
6895  *      @type: type of data
6896  *
6897  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6898  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6899  *      NFT_GOTO verdicts. This function must be called on active data objects
6900  *      from the second phase of the commit protocol.
6901  */
6902 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6903 {
6904         struct nft_chain *chain;
6905
6906         if (type == NFT_DATA_VERDICT) {
6907                 switch (data->verdict.code) {
6908                 case NFT_JUMP:
6909                 case NFT_GOTO:
6910                         chain = data->verdict.chain;
6911                         nft_use_inc_restore(&chain->use);
6912                         break;
6913                 }
6914         }
6915 }
6916
6917 static void nft_setelem_data_activate(const struct net *net,
6918                                       const struct nft_set *set,
6919                                       struct nft_set_elem *elem)
6920 {
6921         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6922
6923         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6924                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6925         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6926                 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6927 }
6928
6929 static void nft_setelem_data_deactivate(const struct net *net,
6930                                         const struct nft_set *set,
6931                                         struct nft_set_elem *elem)
6932 {
6933         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6934
6935         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6936                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6937         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6938                 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6939 }
6940
6941 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6942                            const struct nlattr *attr)
6943 {
6944         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6945         struct nft_set_ext_tmpl tmpl;
6946         struct nft_set_elem elem;
6947         struct nft_set_ext *ext;
6948         struct nft_trans *trans;
6949         u32 flags = 0;
6950         int err;
6951
6952         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6953                                           nft_set_elem_policy, NULL);
6954         if (err < 0)
6955                 return err;
6956
6957         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6958         if (err < 0)
6959                 return err;
6960
6961         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6962                 return -EINVAL;
6963
6964         if (!nft_setelem_valid_key_end(set, nla, flags))
6965                 return -EINVAL;
6966
6967         nft_set_ext_prepare(&tmpl);
6968
6969         if (flags != 0) {
6970                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6971                 if (err < 0)
6972                         return err;
6973         }
6974
6975         if (nla[NFTA_SET_ELEM_KEY]) {
6976                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6977                                             nla[NFTA_SET_ELEM_KEY]);
6978                 if (err < 0)
6979                         return err;
6980
6981                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6982                 if (err < 0)
6983                         goto fail_elem;
6984         }
6985
6986         if (nla[NFTA_SET_ELEM_KEY_END]) {
6987                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6988                                             nla[NFTA_SET_ELEM_KEY_END]);
6989                 if (err < 0)
6990                         goto fail_elem;
6991
6992                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6993                 if (err < 0)
6994                         goto fail_elem_key_end;
6995         }
6996
6997         err = -ENOMEM;
6998         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6999                                       elem.key_end.val.data, NULL, 0, 0,
7000                                       GFP_KERNEL_ACCOUNT);
7001         if (IS_ERR(elem.priv)) {
7002                 err = PTR_ERR(elem.priv);
7003                 goto fail_elem_key_end;
7004         }
7005
7006         ext = nft_set_elem_ext(set, elem.priv);
7007         if (flags)
7008                 *nft_set_ext_flags(ext) = flags;
7009
7010         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7011         if (trans == NULL)
7012                 goto fail_trans;
7013
7014         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7015         if (err < 0)
7016                 goto fail_ops;
7017
7018         nft_setelem_data_deactivate(ctx->net, set, &elem);
7019
7020         nft_trans_elem(trans) = elem;
7021         nft_trans_commit_list_add_tail(ctx->net, trans);
7022         return 0;
7023
7024 fail_ops:
7025         kfree(trans);
7026 fail_trans:
7027         kfree(elem.priv);
7028 fail_elem_key_end:
7029         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7030 fail_elem:
7031         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7032         return err;
7033 }
7034
7035 static int nft_setelem_flush(const struct nft_ctx *ctx,
7036                              struct nft_set *set,
7037                              const struct nft_set_iter *iter,
7038                              struct nft_set_elem *elem)
7039 {
7040         struct nft_trans *trans;
7041         int err;
7042
7043         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7044                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
7045         if (!trans)
7046                 return -ENOMEM;
7047
7048         if (!set->ops->flush(ctx->net, set, elem->priv)) {
7049                 err = -ENOENT;
7050                 goto err1;
7051         }
7052         set->ndeact++;
7053
7054         nft_setelem_data_deactivate(ctx->net, set, elem);
7055         nft_trans_elem_set(trans) = set;
7056         nft_trans_elem(trans) = *elem;
7057         nft_trans_commit_list_add_tail(ctx->net, trans);
7058
7059         return 0;
7060 err1:
7061         kfree(trans);
7062         return err;
7063 }
7064
7065 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7066                                     struct nft_set *set,
7067                                     struct nft_set_elem *elem)
7068 {
7069         struct nft_trans *trans;
7070
7071         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7072                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
7073         if (!trans)
7074                 return -ENOMEM;
7075
7076         nft_setelem_data_deactivate(ctx->net, set, elem);
7077         nft_trans_elem_set(trans) = set;
7078         nft_trans_elem(trans) = *elem;
7079         nft_trans_commit_list_add_tail(ctx->net, trans);
7080
7081         return 0;
7082 }
7083
7084 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7085                                   struct nft_set *set)
7086 {
7087         u8 genmask = nft_genmask_next(ctx->net);
7088         struct nft_set_elem_catchall *catchall;
7089         struct nft_set_elem elem;
7090         struct nft_set_ext *ext;
7091         int ret = 0;
7092
7093         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7094                 ext = nft_set_elem_ext(set, catchall->elem);
7095                 if (!nft_set_elem_active(ext, genmask) ||
7096                     nft_set_elem_mark_busy(ext))
7097                         continue;
7098
7099                 elem.priv = catchall->elem;
7100                 ret = __nft_set_catchall_flush(ctx, set, &elem);
7101                 if (ret < 0)
7102                         break;
7103         }
7104
7105         return ret;
7106 }
7107
7108 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7109 {
7110         struct nft_set_iter iter = {
7111                 .genmask        = genmask,
7112                 .fn             = nft_setelem_flush,
7113         };
7114
7115         set->ops->walk(ctx, set, &iter);
7116         if (!iter.err)
7117                 iter.err = nft_set_catchall_flush(ctx, set);
7118
7119         return iter.err;
7120 }
7121
7122 static int nf_tables_delsetelem(struct sk_buff *skb,
7123                                 const struct nfnl_info *info,
7124                                 const struct nlattr * const nla[])
7125 {
7126         struct netlink_ext_ack *extack = info->extack;
7127         u8 genmask = nft_genmask_next(info->net);
7128         u8 family = info->nfmsg->nfgen_family;
7129         struct net *net = info->net;
7130         const struct nlattr *attr;
7131         struct nft_table *table;
7132         struct nft_set *set;
7133         struct nft_ctx ctx;
7134         int rem, err = 0;
7135
7136         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7137                                  genmask, NETLINK_CB(skb).portid);
7138         if (IS_ERR(table)) {
7139                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7140                 return PTR_ERR(table);
7141         }
7142
7143         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7144         if (IS_ERR(set))
7145                 return PTR_ERR(set);
7146
7147         if (!list_empty(&set->bindings) &&
7148             (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7149                 return -EBUSY;
7150
7151         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7152
7153         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7154                 return nft_set_flush(&ctx, set, genmask);
7155
7156         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7157                 err = nft_del_setelem(&ctx, set, attr);
7158                 if (err == -ENOENT &&
7159                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7160                         continue;
7161
7162                 if (err < 0) {
7163                         NL_SET_BAD_ATTR(extack, attr);
7164                         break;
7165                 }
7166         }
7167         return err;
7168 }
7169
7170 void nft_set_gc_batch_release(struct rcu_head *rcu)
7171 {
7172         struct nft_set_gc_batch *gcb;
7173         unsigned int i;
7174
7175         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
7176         for (i = 0; i < gcb->head.cnt; i++)
7177                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
7178         kfree(gcb);
7179 }
7180
7181 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
7182                                                 gfp_t gfp)
7183 {
7184         struct nft_set_gc_batch *gcb;
7185
7186         gcb = kzalloc(sizeof(*gcb), gfp);
7187         if (gcb == NULL)
7188                 return gcb;
7189         gcb->head.set = set;
7190         return gcb;
7191 }
7192
7193 /*
7194  * Stateful objects
7195  */
7196
7197 /**
7198  *      nft_register_obj- register nf_tables stateful object type
7199  *      @obj_type: object type
7200  *
7201  *      Registers the object type for use with nf_tables. Returns zero on
7202  *      success or a negative errno code otherwise.
7203  */
7204 int nft_register_obj(struct nft_object_type *obj_type)
7205 {
7206         if (obj_type->type == NFT_OBJECT_UNSPEC)
7207                 return -EINVAL;
7208
7209         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7210         list_add_rcu(&obj_type->list, &nf_tables_objects);
7211         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7212         return 0;
7213 }
7214 EXPORT_SYMBOL_GPL(nft_register_obj);
7215
7216 /**
7217  *      nft_unregister_obj - unregister nf_tables object type
7218  *      @obj_type: object type
7219  *
7220  *      Unregisters the object type for use with nf_tables.
7221  */
7222 void nft_unregister_obj(struct nft_object_type *obj_type)
7223 {
7224         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7225         list_del_rcu(&obj_type->list);
7226         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7227 }
7228 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7229
7230 struct nft_object *nft_obj_lookup(const struct net *net,
7231                                   const struct nft_table *table,
7232                                   const struct nlattr *nla, u32 objtype,
7233                                   u8 genmask)
7234 {
7235         struct nft_object_hash_key k = { .table = table };
7236         char search[NFT_OBJ_MAXNAMELEN];
7237         struct rhlist_head *tmp, *list;
7238         struct nft_object *obj;
7239
7240         nla_strscpy(search, nla, sizeof(search));
7241         k.name = search;
7242
7243         WARN_ON_ONCE(!rcu_read_lock_held() &&
7244                      !lockdep_commit_lock_is_held(net));
7245
7246         rcu_read_lock();
7247         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7248         if (!list)
7249                 goto out;
7250
7251         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7252                 if (objtype == obj->ops->type->type &&
7253                     nft_active_genmask(obj, genmask)) {
7254                         rcu_read_unlock();
7255                         return obj;
7256                 }
7257         }
7258 out:
7259         rcu_read_unlock();
7260         return ERR_PTR(-ENOENT);
7261 }
7262 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7263
7264 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7265                                                   const struct nlattr *nla,
7266                                                   u32 objtype, u8 genmask)
7267 {
7268         struct nft_object *obj;
7269
7270         list_for_each_entry(obj, &table->objects, list) {
7271                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7272                     objtype == obj->ops->type->type &&
7273                     nft_active_genmask(obj, genmask))
7274                         return obj;
7275         }
7276         return ERR_PTR(-ENOENT);
7277 }
7278
7279 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7280         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7281                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7282         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7283                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7284         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7285         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7286         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7287         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7288                                     .len = NFT_USERDATA_MAXLEN },
7289 };
7290
7291 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7292                                        const struct nft_object_type *type,
7293                                        const struct nlattr *attr)
7294 {
7295         struct nlattr **tb;
7296         const struct nft_object_ops *ops;
7297         struct nft_object *obj;
7298         int err = -ENOMEM;
7299
7300         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7301         if (!tb)
7302                 goto err1;
7303
7304         if (attr) {
7305                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7306                                                   type->policy, NULL);
7307                 if (err < 0)
7308                         goto err2;
7309         } else {
7310                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7311         }
7312
7313         if (type->select_ops) {
7314                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7315                 if (IS_ERR(ops)) {
7316                         err = PTR_ERR(ops);
7317                         goto err2;
7318                 }
7319         } else {
7320                 ops = type->ops;
7321         }
7322
7323         err = -ENOMEM;
7324         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7325         if (!obj)
7326                 goto err2;
7327
7328         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7329         if (err < 0)
7330                 goto err3;
7331
7332         obj->ops = ops;
7333
7334         kfree(tb);
7335         return obj;
7336 err3:
7337         kfree(obj);
7338 err2:
7339         kfree(tb);
7340 err1:
7341         return ERR_PTR(err);
7342 }
7343
7344 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7345                            struct nft_object *obj, bool reset)
7346 {
7347         struct nlattr *nest;
7348
7349         nest = nla_nest_start_noflag(skb, attr);
7350         if (!nest)
7351                 goto nla_put_failure;
7352         if (obj->ops->dump(skb, obj, reset) < 0)
7353                 goto nla_put_failure;
7354         nla_nest_end(skb, nest);
7355         return 0;
7356
7357 nla_put_failure:
7358         return -1;
7359 }
7360
7361 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7362 {
7363         const struct nft_object_type *type;
7364
7365         list_for_each_entry(type, &nf_tables_objects, list) {
7366                 if (objtype == type->type)
7367                         return type;
7368         }
7369         return NULL;
7370 }
7371
7372 static const struct nft_object_type *
7373 nft_obj_type_get(struct net *net, u32 objtype)
7374 {
7375         const struct nft_object_type *type;
7376
7377         type = __nft_obj_type_get(objtype);
7378         if (type != NULL && try_module_get(type->owner))
7379                 return type;
7380
7381         lockdep_nfnl_nft_mutex_not_held();
7382 #ifdef CONFIG_MODULES
7383         if (type == NULL) {
7384                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7385                         return ERR_PTR(-EAGAIN);
7386         }
7387 #endif
7388         return ERR_PTR(-ENOENT);
7389 }
7390
7391 static int nf_tables_updobj(const struct nft_ctx *ctx,
7392                             const struct nft_object_type *type,
7393                             const struct nlattr *attr,
7394                             struct nft_object *obj)
7395 {
7396         struct nft_object *newobj;
7397         struct nft_trans *trans;
7398         int err = -ENOMEM;
7399
7400         if (!try_module_get(type->owner))
7401                 return -ENOENT;
7402
7403         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7404                                 sizeof(struct nft_trans_obj));
7405         if (!trans)
7406                 goto err_trans;
7407
7408         newobj = nft_obj_init(ctx, type, attr);
7409         if (IS_ERR(newobj)) {
7410                 err = PTR_ERR(newobj);
7411                 goto err_free_trans;
7412         }
7413
7414         nft_trans_obj(trans) = obj;
7415         nft_trans_obj_update(trans) = true;
7416         nft_trans_obj_newobj(trans) = newobj;
7417         nft_trans_commit_list_add_tail(ctx->net, trans);
7418
7419         return 0;
7420
7421 err_free_trans:
7422         kfree(trans);
7423 err_trans:
7424         module_put(type->owner);
7425         return err;
7426 }
7427
7428 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7429                             const struct nlattr * const nla[])
7430 {
7431         struct netlink_ext_ack *extack = info->extack;
7432         u8 genmask = nft_genmask_next(info->net);
7433         u8 family = info->nfmsg->nfgen_family;
7434         const struct nft_object_type *type;
7435         struct net *net = info->net;
7436         struct nft_table *table;
7437         struct nft_object *obj;
7438         struct nft_ctx ctx;
7439         u32 objtype;
7440         int err;
7441
7442         if (!nla[NFTA_OBJ_TYPE] ||
7443             !nla[NFTA_OBJ_NAME] ||
7444             !nla[NFTA_OBJ_DATA])
7445                 return -EINVAL;
7446
7447         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7448                                  NETLINK_CB(skb).portid);
7449         if (IS_ERR(table)) {
7450                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7451                 return PTR_ERR(table);
7452         }
7453
7454         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7455         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7456         if (IS_ERR(obj)) {
7457                 err = PTR_ERR(obj);
7458                 if (err != -ENOENT) {
7459                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7460                         return err;
7461                 }
7462         } else {
7463                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7464                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7465                         return -EEXIST;
7466                 }
7467                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7468                         return -EOPNOTSUPP;
7469
7470                 type = __nft_obj_type_get(objtype);
7471                 if (WARN_ON_ONCE(!type))
7472                         return -ENOENT;
7473
7474                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7475
7476                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7477         }
7478
7479         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7480
7481         if (!nft_use_inc(&table->use))
7482                 return -EMFILE;
7483
7484         type = nft_obj_type_get(net, objtype);
7485         if (IS_ERR(type)) {
7486                 err = PTR_ERR(type);
7487                 goto err_type;
7488         }
7489
7490         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7491         if (IS_ERR(obj)) {
7492                 err = PTR_ERR(obj);
7493                 goto err_init;
7494         }
7495         obj->key.table = table;
7496         obj->handle = nf_tables_alloc_handle(table);
7497
7498         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7499         if (!obj->key.name) {
7500                 err = -ENOMEM;
7501                 goto err_strdup;
7502         }
7503
7504         if (nla[NFTA_OBJ_USERDATA]) {
7505                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7506                 if (obj->udata == NULL)
7507                         goto err_userdata;
7508
7509                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7510         }
7511
7512         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7513         if (err < 0)
7514                 goto err_trans;
7515
7516         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7517                               nft_objname_ht_params);
7518         if (err < 0)
7519                 goto err_obj_ht;
7520
7521         list_add_tail_rcu(&obj->list, &table->objects);
7522
7523         return 0;
7524 err_obj_ht:
7525         /* queued in transaction log */
7526         INIT_LIST_HEAD(&obj->list);
7527         return err;
7528 err_trans:
7529         kfree(obj->udata);
7530 err_userdata:
7531         kfree(obj->key.name);
7532 err_strdup:
7533         if (obj->ops->destroy)
7534                 obj->ops->destroy(&ctx, obj);
7535         kfree(obj);
7536 err_init:
7537         module_put(type->owner);
7538 err_type:
7539         nft_use_dec_restore(&table->use);
7540
7541         return err;
7542 }
7543
7544 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7545                                    u32 portid, u32 seq, int event, u32 flags,
7546                                    int family, const struct nft_table *table,
7547                                    struct nft_object *obj, bool reset)
7548 {
7549         struct nlmsghdr *nlh;
7550
7551         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7552         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7553                            NFNETLINK_V0, nft_base_seq(net));
7554         if (!nlh)
7555                 goto nla_put_failure;
7556
7557         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7558             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7559             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7560                          NFTA_OBJ_PAD))
7561                 goto nla_put_failure;
7562
7563         if (event == NFT_MSG_DELOBJ) {
7564                 nlmsg_end(skb, nlh);
7565                 return 0;
7566         }
7567
7568         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7569             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7570             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7571                 goto nla_put_failure;
7572
7573         if (obj->udata &&
7574             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7575                 goto nla_put_failure;
7576
7577         nlmsg_end(skb, nlh);
7578         return 0;
7579
7580 nla_put_failure:
7581         nlmsg_trim(skb, nlh);
7582         return -1;
7583 }
7584
7585 struct nft_obj_filter {
7586         char            *table;
7587         u32             type;
7588 };
7589
7590 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7591 {
7592         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7593         const struct nft_table *table;
7594         unsigned int idx = 0, s_idx = cb->args[0];
7595         struct nft_obj_filter *filter = cb->data;
7596         struct net *net = sock_net(skb->sk);
7597         int family = nfmsg->nfgen_family;
7598         struct nftables_pernet *nft_net;
7599         struct nft_object *obj;
7600         bool reset = false;
7601
7602         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7603                 reset = true;
7604
7605         rcu_read_lock();
7606         nft_net = nft_pernet(net);
7607         cb->seq = READ_ONCE(nft_net->base_seq);
7608
7609         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7610                 if (family != NFPROTO_UNSPEC && family != table->family)
7611                         continue;
7612
7613                 list_for_each_entry_rcu(obj, &table->objects, list) {
7614                         if (!nft_is_active(net, obj))
7615                                 goto cont;
7616                         if (idx < s_idx)
7617                                 goto cont;
7618                         if (idx > s_idx)
7619                                 memset(&cb->args[1], 0,
7620                                        sizeof(cb->args) - sizeof(cb->args[0]));
7621                         if (filter && filter->table &&
7622                             strcmp(filter->table, table->name))
7623                                 goto cont;
7624                         if (filter &&
7625                             filter->type != NFT_OBJECT_UNSPEC &&
7626                             obj->ops->type->type != filter->type)
7627                                 goto cont;
7628                         if (reset) {
7629                                 char *buf = kasprintf(GFP_ATOMIC,
7630                                                       "%s:%u",
7631                                                       table->name,
7632                                                       nft_net->base_seq);
7633
7634                                 audit_log_nfcfg(buf,
7635                                                 family,
7636                                                 obj->handle,
7637                                                 AUDIT_NFT_OP_OBJ_RESET,
7638                                                 GFP_ATOMIC);
7639                                 kfree(buf);
7640                         }
7641
7642                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7643                                                     cb->nlh->nlmsg_seq,
7644                                                     NFT_MSG_NEWOBJ,
7645                                                     NLM_F_MULTI | NLM_F_APPEND,
7646                                                     table->family, table,
7647                                                     obj, reset) < 0)
7648                                 goto done;
7649
7650                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7651 cont:
7652                         idx++;
7653                 }
7654         }
7655 done:
7656         rcu_read_unlock();
7657
7658         cb->args[0] = idx;
7659         return skb->len;
7660 }
7661
7662 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7663 {
7664         const struct nlattr * const *nla = cb->data;
7665         struct nft_obj_filter *filter = NULL;
7666
7667         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7668                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7669                 if (!filter)
7670                         return -ENOMEM;
7671
7672                 if (nla[NFTA_OBJ_TABLE]) {
7673                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7674                         if (!filter->table) {
7675                                 kfree(filter);
7676                                 return -ENOMEM;
7677                         }
7678                 }
7679
7680                 if (nla[NFTA_OBJ_TYPE])
7681                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7682         }
7683
7684         cb->data = filter;
7685         return 0;
7686 }
7687
7688 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7689 {
7690         struct nft_obj_filter *filter = cb->data;
7691
7692         if (filter) {
7693                 kfree(filter->table);
7694                 kfree(filter);
7695         }
7696
7697         return 0;
7698 }
7699
7700 /* called with rcu_read_lock held */
7701 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7702                             const struct nlattr * const nla[])
7703 {
7704         struct netlink_ext_ack *extack = info->extack;
7705         u8 genmask = nft_genmask_cur(info->net);
7706         u8 family = info->nfmsg->nfgen_family;
7707         const struct nft_table *table;
7708         struct net *net = info->net;
7709         struct nft_object *obj;
7710         struct sk_buff *skb2;
7711         bool reset = false;
7712         u32 objtype;
7713         int err;
7714
7715         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7716                 struct netlink_dump_control c = {
7717                         .start = nf_tables_dump_obj_start,
7718                         .dump = nf_tables_dump_obj,
7719                         .done = nf_tables_dump_obj_done,
7720                         .module = THIS_MODULE,
7721                         .data = (void *)nla,
7722                 };
7723
7724                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7725         }
7726
7727         if (!nla[NFTA_OBJ_NAME] ||
7728             !nla[NFTA_OBJ_TYPE])
7729                 return -EINVAL;
7730
7731         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7732         if (IS_ERR(table)) {
7733                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7734                 return PTR_ERR(table);
7735         }
7736
7737         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7738         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7739         if (IS_ERR(obj)) {
7740                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7741                 return PTR_ERR(obj);
7742         }
7743
7744         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7745         if (!skb2)
7746                 return -ENOMEM;
7747
7748         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7749                 reset = true;
7750
7751         if (reset) {
7752                 const struct nftables_pernet *nft_net;
7753                 char *buf;
7754
7755                 nft_net = nft_pernet(net);
7756                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7757
7758                 audit_log_nfcfg(buf,
7759                                 family,
7760                                 obj->handle,
7761                                 AUDIT_NFT_OP_OBJ_RESET,
7762                                 GFP_ATOMIC);
7763                 kfree(buf);
7764         }
7765
7766         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7767                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7768                                       family, table, obj, reset);
7769         if (err < 0)
7770                 goto err_fill_obj_info;
7771
7772         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7773
7774 err_fill_obj_info:
7775         kfree_skb(skb2);
7776         return err;
7777 }
7778
7779 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7780 {
7781         if (obj->ops->destroy)
7782                 obj->ops->destroy(ctx, obj);
7783
7784         module_put(obj->ops->type->owner);
7785         kfree(obj->key.name);
7786         kfree(obj->udata);
7787         kfree(obj);
7788 }
7789
7790 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7791                             const struct nlattr * const nla[])
7792 {
7793         struct netlink_ext_ack *extack = info->extack;
7794         u8 genmask = nft_genmask_next(info->net);
7795         u8 family = info->nfmsg->nfgen_family;
7796         struct net *net = info->net;
7797         const struct nlattr *attr;
7798         struct nft_table *table;
7799         struct nft_object *obj;
7800         struct nft_ctx ctx;
7801         u32 objtype;
7802
7803         if (!nla[NFTA_OBJ_TYPE] ||
7804             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7805                 return -EINVAL;
7806
7807         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7808                                  NETLINK_CB(skb).portid);
7809         if (IS_ERR(table)) {
7810                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7811                 return PTR_ERR(table);
7812         }
7813
7814         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7815         if (nla[NFTA_OBJ_HANDLE]) {
7816                 attr = nla[NFTA_OBJ_HANDLE];
7817                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7818         } else {
7819                 attr = nla[NFTA_OBJ_NAME];
7820                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7821         }
7822
7823         if (IS_ERR(obj)) {
7824                 if (PTR_ERR(obj) == -ENOENT &&
7825                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7826                         return 0;
7827
7828                 NL_SET_BAD_ATTR(extack, attr);
7829                 return PTR_ERR(obj);
7830         }
7831         if (obj->use > 0) {
7832                 NL_SET_BAD_ATTR(extack, attr);
7833                 return -EBUSY;
7834         }
7835
7836         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7837
7838         return nft_delobj(&ctx, obj);
7839 }
7840
7841 void nft_obj_notify(struct net *net, const struct nft_table *table,
7842                     struct nft_object *obj, u32 portid, u32 seq, int event,
7843                     u16 flags, int family, int report, gfp_t gfp)
7844 {
7845         struct nftables_pernet *nft_net = nft_pernet(net);
7846         struct sk_buff *skb;
7847         int err;
7848         char *buf = kasprintf(gfp, "%s:%u",
7849                               table->name, nft_net->base_seq);
7850
7851         audit_log_nfcfg(buf,
7852                         family,
7853                         obj->handle,
7854                         event == NFT_MSG_NEWOBJ ?
7855                                  AUDIT_NFT_OP_OBJ_REGISTER :
7856                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7857                         gfp);
7858         kfree(buf);
7859
7860         if (!report &&
7861             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7862                 return;
7863
7864         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7865         if (skb == NULL)
7866                 goto err;
7867
7868         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7869                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7870                                       family, table, obj, false);
7871         if (err < 0) {
7872                 kfree_skb(skb);
7873                 goto err;
7874         }
7875
7876         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7877         return;
7878 err:
7879         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7880 }
7881 EXPORT_SYMBOL_GPL(nft_obj_notify);
7882
7883 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7884                                  struct nft_object *obj, int event)
7885 {
7886         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7887                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7888 }
7889
7890 /*
7891  * Flow tables
7892  */
7893 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7894 {
7895         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7896         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7897         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7898 }
7899 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7900
7901 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7902 {
7903         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7904         list_del_rcu(&type->list);
7905         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7906 }
7907 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7908
7909 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7910         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7911                                             .len = NFT_NAME_MAXLEN - 1 },
7912         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7913                                             .len = NFT_NAME_MAXLEN - 1 },
7914         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7915         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7916         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7917 };
7918
7919 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7920                                            const struct nlattr *nla, u8 genmask)
7921 {
7922         struct nft_flowtable *flowtable;
7923
7924         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7925                 if (!nla_strcmp(nla, flowtable->name) &&
7926                     nft_active_genmask(flowtable, genmask))
7927                         return flowtable;
7928         }
7929         return ERR_PTR(-ENOENT);
7930 }
7931 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7932
7933 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7934                                     struct nft_flowtable *flowtable,
7935                                     enum nft_trans_phase phase)
7936 {
7937         switch (phase) {
7938         case NFT_TRANS_PREPARE_ERROR:
7939         case NFT_TRANS_PREPARE:
7940         case NFT_TRANS_ABORT:
7941         case NFT_TRANS_RELEASE:
7942                 nft_use_dec(&flowtable->use);
7943                 fallthrough;
7944         default:
7945                 return;
7946         }
7947 }
7948 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7949
7950 static struct nft_flowtable *
7951 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7952                               const struct nlattr *nla, u8 genmask)
7953 {
7954        struct nft_flowtable *flowtable;
7955
7956        list_for_each_entry(flowtable, &table->flowtables, list) {
7957                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7958                    nft_active_genmask(flowtable, genmask))
7959                        return flowtable;
7960        }
7961        return ERR_PTR(-ENOENT);
7962 }
7963
7964 struct nft_flowtable_hook {
7965         u32                     num;
7966         int                     priority;
7967         struct list_head        list;
7968 };
7969
7970 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7971         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7972         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7973         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7974 };
7975
7976 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7977                                     const struct nlattr * const nla[],
7978                                     struct nft_flowtable_hook *flowtable_hook,
7979                                     struct nft_flowtable *flowtable,
7980                                     struct netlink_ext_ack *extack, bool add)
7981 {
7982         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7983         struct nft_hook *hook;
7984         int hooknum, priority;
7985         int err;
7986
7987         INIT_LIST_HEAD(&flowtable_hook->list);
7988
7989         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
7990                                           nla[NFTA_FLOWTABLE_HOOK],
7991                                           nft_flowtable_hook_policy, NULL);
7992         if (err < 0)
7993                 return err;
7994
7995         if (add) {
7996                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7997                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7998                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7999                         return -ENOENT;
8000                 }
8001
8002                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8003                 if (hooknum != NF_NETDEV_INGRESS)
8004                         return -EOPNOTSUPP;
8005
8006                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8007
8008                 flowtable_hook->priority        = priority;
8009                 flowtable_hook->num             = hooknum;
8010         } else {
8011                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8012                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8013                         if (hooknum != flowtable->hooknum)
8014                                 return -EOPNOTSUPP;
8015                 }
8016
8017                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8018                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8019                         if (priority != flowtable->data.priority)
8020                                 return -EOPNOTSUPP;
8021                 }
8022
8023                 flowtable_hook->priority        = flowtable->data.priority;
8024                 flowtable_hook->num             = flowtable->hooknum;
8025         }
8026
8027         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8028                 err = nf_tables_parse_netdev_hooks(ctx->net,
8029                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
8030                                                    &flowtable_hook->list,
8031                                                    extack);
8032                 if (err < 0)
8033                         return err;
8034         }
8035
8036         list_for_each_entry(hook, &flowtable_hook->list, list) {
8037                 hook->ops.pf            = NFPROTO_NETDEV;
8038                 hook->ops.hooknum       = flowtable_hook->num;
8039                 hook->ops.priority      = flowtable_hook->priority;
8040                 hook->ops.priv          = &flowtable->data;
8041                 hook->ops.hook          = flowtable->data.type->hook;
8042         }
8043
8044         return err;
8045 }
8046
8047 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8048 {
8049         const struct nf_flowtable_type *type;
8050
8051         list_for_each_entry(type, &nf_tables_flowtables, list) {
8052                 if (family == type->family)
8053                         return type;
8054         }
8055         return NULL;
8056 }
8057
8058 static const struct nf_flowtable_type *
8059 nft_flowtable_type_get(struct net *net, u8 family)
8060 {
8061         const struct nf_flowtable_type *type;
8062
8063         type = __nft_flowtable_type_get(family);
8064         if (type != NULL && try_module_get(type->owner))
8065                 return type;
8066
8067         lockdep_nfnl_nft_mutex_not_held();
8068 #ifdef CONFIG_MODULES
8069         if (type == NULL) {
8070                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8071                         return ERR_PTR(-EAGAIN);
8072         }
8073 #endif
8074         return ERR_PTR(-ENOENT);
8075 }
8076
8077 /* Only called from error and netdev event paths. */
8078 static void nft_unregister_flowtable_hook(struct net *net,
8079                                           struct nft_flowtable *flowtable,
8080                                           struct nft_hook *hook)
8081 {
8082         nf_unregister_net_hook(net, &hook->ops);
8083         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8084                                     FLOW_BLOCK_UNBIND);
8085 }
8086
8087 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8088                                                  struct list_head *hook_list,
8089                                                  bool release_netdev)
8090 {
8091         struct nft_hook *hook, *next;
8092
8093         list_for_each_entry_safe(hook, next, hook_list, list) {
8094                 nf_unregister_net_hook(net, &hook->ops);
8095                 if (release_netdev) {
8096                         list_del(&hook->list);
8097                         kfree_rcu(hook, rcu);
8098                 }
8099         }
8100 }
8101
8102 static void nft_unregister_flowtable_net_hooks(struct net *net,
8103                                                struct list_head *hook_list)
8104 {
8105         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8106 }
8107
8108 static int nft_register_flowtable_net_hooks(struct net *net,
8109                                             struct nft_table *table,
8110                                             struct list_head *hook_list,
8111                                             struct nft_flowtable *flowtable)
8112 {
8113         struct nft_hook *hook, *hook2, *next;
8114         struct nft_flowtable *ft;
8115         int err, i = 0;
8116
8117         list_for_each_entry(hook, hook_list, list) {
8118                 list_for_each_entry(ft, &table->flowtables, list) {
8119                         if (!nft_is_active_next(net, ft))
8120                                 continue;
8121
8122                         list_for_each_entry(hook2, &ft->hook_list, list) {
8123                                 if (hook->ops.dev == hook2->ops.dev &&
8124                                     hook->ops.pf == hook2->ops.pf) {
8125                                         err = -EEXIST;
8126                                         goto err_unregister_net_hooks;
8127                                 }
8128                         }
8129                 }
8130
8131                 err = flowtable->data.type->setup(&flowtable->data,
8132                                                   hook->ops.dev,
8133                                                   FLOW_BLOCK_BIND);
8134                 if (err < 0)
8135                         goto err_unregister_net_hooks;
8136
8137                 err = nf_register_net_hook(net, &hook->ops);
8138                 if (err < 0) {
8139                         flowtable->data.type->setup(&flowtable->data,
8140                                                     hook->ops.dev,
8141                                                     FLOW_BLOCK_UNBIND);
8142                         goto err_unregister_net_hooks;
8143                 }
8144
8145                 i++;
8146         }
8147
8148         return 0;
8149
8150 err_unregister_net_hooks:
8151         list_for_each_entry_safe(hook, next, hook_list, list) {
8152                 if (i-- <= 0)
8153                         break;
8154
8155                 nft_unregister_flowtable_hook(net, flowtable, hook);
8156                 list_del_rcu(&hook->list);
8157                 kfree_rcu(hook, rcu);
8158         }
8159
8160         return err;
8161 }
8162
8163 static void nft_hooks_destroy(struct list_head *hook_list)
8164 {
8165         struct nft_hook *hook, *next;
8166
8167         list_for_each_entry_safe(hook, next, hook_list, list) {
8168                 list_del_rcu(&hook->list);
8169                 kfree_rcu(hook, rcu);
8170         }
8171 }
8172
8173 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8174                                 struct nft_flowtable *flowtable,
8175                                 struct netlink_ext_ack *extack)
8176 {
8177         const struct nlattr * const *nla = ctx->nla;
8178         struct nft_flowtable_hook flowtable_hook;
8179         struct nft_hook *hook, *next;
8180         struct nft_trans *trans;
8181         bool unregister = false;
8182         u32 flags;
8183         int err;
8184
8185         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8186                                        extack, false);
8187         if (err < 0)
8188                 return err;
8189
8190         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8191                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8192                         list_del(&hook->list);
8193                         kfree(hook);
8194                 }
8195         }
8196
8197         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8198                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8199                 if (flags & ~NFT_FLOWTABLE_MASK) {
8200                         err = -EOPNOTSUPP;
8201                         goto err_flowtable_update_hook;
8202                 }
8203                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8204                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8205                         err = -EOPNOTSUPP;
8206                         goto err_flowtable_update_hook;
8207                 }
8208         } else {
8209                 flags = flowtable->data.flags;
8210         }
8211
8212         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8213                                                &flowtable_hook.list, flowtable);
8214         if (err < 0)
8215                 goto err_flowtable_update_hook;
8216
8217         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8218                                 sizeof(struct nft_trans_flowtable));
8219         if (!trans) {
8220                 unregister = true;
8221                 err = -ENOMEM;
8222                 goto err_flowtable_update_hook;
8223         }
8224
8225         nft_trans_flowtable_flags(trans) = flags;
8226         nft_trans_flowtable(trans) = flowtable;
8227         nft_trans_flowtable_update(trans) = true;
8228         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8229         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8230
8231         nft_trans_commit_list_add_tail(ctx->net, trans);
8232
8233         return 0;
8234
8235 err_flowtable_update_hook:
8236         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8237                 if (unregister)
8238                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8239                 list_del_rcu(&hook->list);
8240                 kfree_rcu(hook, rcu);
8241         }
8242
8243         return err;
8244
8245 }
8246
8247 static int nf_tables_newflowtable(struct sk_buff *skb,
8248                                   const struct nfnl_info *info,
8249                                   const struct nlattr * const nla[])
8250 {
8251         struct netlink_ext_ack *extack = info->extack;
8252         struct nft_flowtable_hook flowtable_hook;
8253         u8 genmask = nft_genmask_next(info->net);
8254         u8 family = info->nfmsg->nfgen_family;
8255         const struct nf_flowtable_type *type;
8256         struct nft_flowtable *flowtable;
8257         struct nft_hook *hook, *next;
8258         struct net *net = info->net;
8259         struct nft_table *table;
8260         struct nft_ctx ctx;
8261         int err;
8262
8263         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8264             !nla[NFTA_FLOWTABLE_NAME] ||
8265             !nla[NFTA_FLOWTABLE_HOOK])
8266                 return -EINVAL;
8267
8268         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8269                                  genmask, NETLINK_CB(skb).portid);
8270         if (IS_ERR(table)) {
8271                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8272                 return PTR_ERR(table);
8273         }
8274
8275         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8276                                          genmask);
8277         if (IS_ERR(flowtable)) {
8278                 err = PTR_ERR(flowtable);
8279                 if (err != -ENOENT) {
8280                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8281                         return err;
8282                 }
8283         } else {
8284                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8285                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8286                         return -EEXIST;
8287                 }
8288
8289                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8290
8291                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8292         }
8293
8294         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8295
8296         if (!nft_use_inc(&table->use))
8297                 return -EMFILE;
8298
8299         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8300         if (!flowtable) {
8301                 err = -ENOMEM;
8302                 goto flowtable_alloc;
8303         }
8304
8305         flowtable->table = table;
8306         flowtable->handle = nf_tables_alloc_handle(table);
8307         INIT_LIST_HEAD(&flowtable->hook_list);
8308
8309         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8310         if (!flowtable->name) {
8311                 err = -ENOMEM;
8312                 goto err1;
8313         }
8314
8315         type = nft_flowtable_type_get(net, family);
8316         if (IS_ERR(type)) {
8317                 err = PTR_ERR(type);
8318                 goto err2;
8319         }
8320
8321         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8322                 flowtable->data.flags =
8323                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8324                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8325                         err = -EOPNOTSUPP;
8326                         goto err3;
8327                 }
8328         }
8329
8330         write_pnet(&flowtable->data.net, net);
8331         flowtable->data.type = type;
8332         err = type->init(&flowtable->data);
8333         if (err < 0)
8334                 goto err3;
8335
8336         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8337                                        extack, true);
8338         if (err < 0)
8339                 goto err4;
8340
8341         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8342         flowtable->data.priority = flowtable_hook.priority;
8343         flowtable->hooknum = flowtable_hook.num;
8344
8345         err = nft_register_flowtable_net_hooks(ctx.net, table,
8346                                                &flowtable->hook_list,
8347                                                flowtable);
8348         if (err < 0) {
8349                 nft_hooks_destroy(&flowtable->hook_list);
8350                 goto err4;
8351         }
8352
8353         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8354         if (err < 0)
8355                 goto err5;
8356
8357         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8358
8359         return 0;
8360 err5:
8361         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8362                 nft_unregister_flowtable_hook(net, flowtable, hook);
8363                 list_del_rcu(&hook->list);
8364                 kfree_rcu(hook, rcu);
8365         }
8366 err4:
8367         flowtable->data.type->free(&flowtable->data);
8368 err3:
8369         module_put(type->owner);
8370 err2:
8371         kfree(flowtable->name);
8372 err1:
8373         kfree(flowtable);
8374 flowtable_alloc:
8375         nft_use_dec_restore(&table->use);
8376
8377         return err;
8378 }
8379
8380 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8381 {
8382         struct nft_hook *this, *next;
8383
8384         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8385                 list_del(&this->list);
8386                 kfree(this);
8387         }
8388 }
8389
8390 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8391                                  struct nft_flowtable *flowtable,
8392                                  struct netlink_ext_ack *extack)
8393 {
8394         const struct nlattr * const *nla = ctx->nla;
8395         struct nft_flowtable_hook flowtable_hook;
8396         LIST_HEAD(flowtable_del_list);
8397         struct nft_hook *this, *hook;
8398         struct nft_trans *trans;
8399         int err;
8400
8401         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8402                                        extack, false);
8403         if (err < 0)
8404                 return err;
8405
8406         list_for_each_entry(this, &flowtable_hook.list, list) {
8407                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8408                 if (!hook) {
8409                         err = -ENOENT;
8410                         goto err_flowtable_del_hook;
8411                 }
8412                 list_move(&hook->list, &flowtable_del_list);
8413         }
8414
8415         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8416                                 sizeof(struct nft_trans_flowtable));
8417         if (!trans) {
8418                 err = -ENOMEM;
8419                 goto err_flowtable_del_hook;
8420         }
8421
8422         nft_trans_flowtable(trans) = flowtable;
8423         nft_trans_flowtable_update(trans) = true;
8424         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8425         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8426         nft_flowtable_hook_release(&flowtable_hook);
8427
8428         nft_trans_commit_list_add_tail(ctx->net, trans);
8429
8430         return 0;
8431
8432 err_flowtable_del_hook:
8433         list_splice(&flowtable_del_list, &flowtable->hook_list);
8434         nft_flowtable_hook_release(&flowtable_hook);
8435
8436         return err;
8437 }
8438
8439 static int nf_tables_delflowtable(struct sk_buff *skb,
8440                                   const struct nfnl_info *info,
8441                                   const struct nlattr * const nla[])
8442 {
8443         struct netlink_ext_ack *extack = info->extack;
8444         u8 genmask = nft_genmask_next(info->net);
8445         u8 family = info->nfmsg->nfgen_family;
8446         struct nft_flowtable *flowtable;
8447         struct net *net = info->net;
8448         const struct nlattr *attr;
8449         struct nft_table *table;
8450         struct nft_ctx ctx;
8451
8452         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8453             (!nla[NFTA_FLOWTABLE_NAME] &&
8454              !nla[NFTA_FLOWTABLE_HANDLE]))
8455                 return -EINVAL;
8456
8457         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8458                                  genmask, NETLINK_CB(skb).portid);
8459         if (IS_ERR(table)) {
8460                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8461                 return PTR_ERR(table);
8462         }
8463
8464         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8465                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8466                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8467         } else {
8468                 attr = nla[NFTA_FLOWTABLE_NAME];
8469                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8470         }
8471
8472         if (IS_ERR(flowtable)) {
8473                 if (PTR_ERR(flowtable) == -ENOENT &&
8474                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8475                         return 0;
8476
8477                 NL_SET_BAD_ATTR(extack, attr);
8478                 return PTR_ERR(flowtable);
8479         }
8480
8481         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8482
8483         if (nla[NFTA_FLOWTABLE_HOOK])
8484                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8485
8486         if (flowtable->use > 0) {
8487                 NL_SET_BAD_ATTR(extack, attr);
8488                 return -EBUSY;
8489         }
8490
8491         return nft_delflowtable(&ctx, flowtable);
8492 }
8493
8494 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8495                                          u32 portid, u32 seq, int event,
8496                                          u32 flags, int family,
8497                                          struct nft_flowtable *flowtable,
8498                                          struct list_head *hook_list)
8499 {
8500         struct nlattr *nest, *nest_devs;
8501         struct nft_hook *hook;
8502         struct nlmsghdr *nlh;
8503
8504         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8505         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8506                            NFNETLINK_V0, nft_base_seq(net));
8507         if (!nlh)
8508                 goto nla_put_failure;
8509
8510         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8511             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8512             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8513                          NFTA_FLOWTABLE_PAD))
8514                 goto nla_put_failure;
8515
8516         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8517                 nlmsg_end(skb, nlh);
8518                 return 0;
8519         }
8520
8521         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8522             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8523                 goto nla_put_failure;
8524
8525         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8526         if (!nest)
8527                 goto nla_put_failure;
8528         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8529             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8530                 goto nla_put_failure;
8531
8532         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8533         if (!nest_devs)
8534                 goto nla_put_failure;
8535
8536         if (!hook_list)
8537                 hook_list = &flowtable->hook_list;
8538
8539         list_for_each_entry_rcu(hook, hook_list, list) {
8540                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8541                         goto nla_put_failure;
8542         }
8543         nla_nest_end(skb, nest_devs);
8544         nla_nest_end(skb, nest);
8545
8546         nlmsg_end(skb, nlh);
8547         return 0;
8548
8549 nla_put_failure:
8550         nlmsg_trim(skb, nlh);
8551         return -1;
8552 }
8553
8554 struct nft_flowtable_filter {
8555         char            *table;
8556 };
8557
8558 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8559                                     struct netlink_callback *cb)
8560 {
8561         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8562         struct nft_flowtable_filter *filter = cb->data;
8563         unsigned int idx = 0, s_idx = cb->args[0];
8564         struct net *net = sock_net(skb->sk);
8565         int family = nfmsg->nfgen_family;
8566         struct nft_flowtable *flowtable;
8567         struct nftables_pernet *nft_net;
8568         const struct nft_table *table;
8569
8570         rcu_read_lock();
8571         nft_net = nft_pernet(net);
8572         cb->seq = READ_ONCE(nft_net->base_seq);
8573
8574         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8575                 if (family != NFPROTO_UNSPEC && family != table->family)
8576                         continue;
8577
8578                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8579                         if (!nft_is_active(net, flowtable))
8580                                 goto cont;
8581                         if (idx < s_idx)
8582                                 goto cont;
8583                         if (idx > s_idx)
8584                                 memset(&cb->args[1], 0,
8585                                        sizeof(cb->args) - sizeof(cb->args[0]));
8586                         if (filter && filter->table &&
8587                             strcmp(filter->table, table->name))
8588                                 goto cont;
8589
8590                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8591                                                           cb->nlh->nlmsg_seq,
8592                                                           NFT_MSG_NEWFLOWTABLE,
8593                                                           NLM_F_MULTI | NLM_F_APPEND,
8594                                                           table->family,
8595                                                           flowtable, NULL) < 0)
8596                                 goto done;
8597
8598                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8599 cont:
8600                         idx++;
8601                 }
8602         }
8603 done:
8604         rcu_read_unlock();
8605
8606         cb->args[0] = idx;
8607         return skb->len;
8608 }
8609
8610 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8611 {
8612         const struct nlattr * const *nla = cb->data;
8613         struct nft_flowtable_filter *filter = NULL;
8614
8615         if (nla[NFTA_FLOWTABLE_TABLE]) {
8616                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8617                 if (!filter)
8618                         return -ENOMEM;
8619
8620                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8621                                            GFP_ATOMIC);
8622                 if (!filter->table) {
8623                         kfree(filter);
8624                         return -ENOMEM;
8625                 }
8626         }
8627
8628         cb->data = filter;
8629         return 0;
8630 }
8631
8632 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8633 {
8634         struct nft_flowtable_filter *filter = cb->data;
8635
8636         if (!filter)
8637                 return 0;
8638
8639         kfree(filter->table);
8640         kfree(filter);
8641
8642         return 0;
8643 }
8644
8645 /* called with rcu_read_lock held */
8646 static int nf_tables_getflowtable(struct sk_buff *skb,
8647                                   const struct nfnl_info *info,
8648                                   const struct nlattr * const nla[])
8649 {
8650         u8 genmask = nft_genmask_cur(info->net);
8651         u8 family = info->nfmsg->nfgen_family;
8652         struct nft_flowtable *flowtable;
8653         const struct nft_table *table;
8654         struct net *net = info->net;
8655         struct sk_buff *skb2;
8656         int err;
8657
8658         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8659                 struct netlink_dump_control c = {
8660                         .start = nf_tables_dump_flowtable_start,
8661                         .dump = nf_tables_dump_flowtable,
8662                         .done = nf_tables_dump_flowtable_done,
8663                         .module = THIS_MODULE,
8664                         .data = (void *)nla,
8665                 };
8666
8667                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8668         }
8669
8670         if (!nla[NFTA_FLOWTABLE_NAME])
8671                 return -EINVAL;
8672
8673         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8674                                  genmask, 0);
8675         if (IS_ERR(table))
8676                 return PTR_ERR(table);
8677
8678         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8679                                          genmask);
8680         if (IS_ERR(flowtable))
8681                 return PTR_ERR(flowtable);
8682
8683         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8684         if (!skb2)
8685                 return -ENOMEM;
8686
8687         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8688                                             info->nlh->nlmsg_seq,
8689                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8690                                             flowtable, NULL);
8691         if (err < 0)
8692                 goto err_fill_flowtable_info;
8693
8694         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8695
8696 err_fill_flowtable_info:
8697         kfree_skb(skb2);
8698         return err;
8699 }
8700
8701 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8702                                        struct nft_flowtable *flowtable,
8703                                        struct list_head *hook_list, int event)
8704 {
8705         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8706         struct sk_buff *skb;
8707         u16 flags = 0;
8708         int err;
8709
8710         if (!ctx->report &&
8711             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8712                 return;
8713
8714         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8715         if (skb == NULL)
8716                 goto err;
8717
8718         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8719                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8720
8721         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8722                                             ctx->seq, event, flags,
8723                                             ctx->family, flowtable, hook_list);
8724         if (err < 0) {
8725                 kfree_skb(skb);
8726                 goto err;
8727         }
8728
8729         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8730         return;
8731 err:
8732         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8733 }
8734
8735 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8736 {
8737         struct nft_hook *hook, *next;
8738
8739         flowtable->data.type->free(&flowtable->data);
8740         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8741                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8742                                             FLOW_BLOCK_UNBIND);
8743                 list_del_rcu(&hook->list);
8744                 kfree(hook);
8745         }
8746         kfree(flowtable->name);
8747         module_put(flowtable->data.type->owner);
8748         kfree(flowtable);
8749 }
8750
8751 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8752                                    u32 portid, u32 seq)
8753 {
8754         struct nftables_pernet *nft_net = nft_pernet(net);
8755         struct nlmsghdr *nlh;
8756         char buf[TASK_COMM_LEN];
8757         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8758
8759         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8760                            NFNETLINK_V0, nft_base_seq(net));
8761         if (!nlh)
8762                 goto nla_put_failure;
8763
8764         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8765             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8766             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8767                 goto nla_put_failure;
8768
8769         nlmsg_end(skb, nlh);
8770         return 0;
8771
8772 nla_put_failure:
8773         nlmsg_trim(skb, nlh);
8774         return -EMSGSIZE;
8775 }
8776
8777 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8778                                 struct nft_flowtable *flowtable)
8779 {
8780         struct nft_hook *hook;
8781
8782         list_for_each_entry(hook, &flowtable->hook_list, list) {
8783                 if (hook->ops.dev != dev)
8784                         continue;
8785
8786                 /* flow_offload_netdev_event() cleans up entries for us. */
8787                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8788                 list_del_rcu(&hook->list);
8789                 kfree_rcu(hook, rcu);
8790                 break;
8791         }
8792 }
8793
8794 static int nf_tables_flowtable_event(struct notifier_block *this,
8795                                      unsigned long event, void *ptr)
8796 {
8797         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8798         struct nft_flowtable *flowtable;
8799         struct nftables_pernet *nft_net;
8800         struct nft_table *table;
8801         struct net *net;
8802
8803         if (event != NETDEV_UNREGISTER)
8804                 return 0;
8805
8806         net = dev_net(dev);
8807         nft_net = nft_pernet(net);
8808         mutex_lock(&nft_net->commit_mutex);
8809         list_for_each_entry(table, &nft_net->tables, list) {
8810                 list_for_each_entry(flowtable, &table->flowtables, list) {
8811                         nft_flowtable_event(event, dev, flowtable);
8812                 }
8813         }
8814         mutex_unlock(&nft_net->commit_mutex);
8815
8816         return NOTIFY_DONE;
8817 }
8818
8819 static struct notifier_block nf_tables_flowtable_notifier = {
8820         .notifier_call  = nf_tables_flowtable_event,
8821 };
8822
8823 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8824                                  int event)
8825 {
8826         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8827         struct sk_buff *skb2;
8828         int err;
8829
8830         if (!nlmsg_report(nlh) &&
8831             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8832                 return;
8833
8834         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8835         if (skb2 == NULL)
8836                 goto err;
8837
8838         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8839                                       nlh->nlmsg_seq);
8840         if (err < 0) {
8841                 kfree_skb(skb2);
8842                 goto err;
8843         }
8844
8845         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8846                        nlmsg_report(nlh), GFP_KERNEL);
8847         return;
8848 err:
8849         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8850                           -ENOBUFS);
8851 }
8852
8853 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8854                             const struct nlattr * const nla[])
8855 {
8856         struct sk_buff *skb2;
8857         int err;
8858
8859         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8860         if (skb2 == NULL)
8861                 return -ENOMEM;
8862
8863         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8864                                       info->nlh->nlmsg_seq);
8865         if (err < 0)
8866                 goto err_fill_gen_info;
8867
8868         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8869
8870 err_fill_gen_info:
8871         kfree_skb(skb2);
8872         return err;
8873 }
8874
8875 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8876         [NFT_MSG_NEWTABLE] = {
8877                 .call           = nf_tables_newtable,
8878                 .type           = NFNL_CB_BATCH,
8879                 .attr_count     = NFTA_TABLE_MAX,
8880                 .policy         = nft_table_policy,
8881         },
8882         [NFT_MSG_GETTABLE] = {
8883                 .call           = nf_tables_gettable,
8884                 .type           = NFNL_CB_RCU,
8885                 .attr_count     = NFTA_TABLE_MAX,
8886                 .policy         = nft_table_policy,
8887         },
8888         [NFT_MSG_DELTABLE] = {
8889                 .call           = nf_tables_deltable,
8890                 .type           = NFNL_CB_BATCH,
8891                 .attr_count     = NFTA_TABLE_MAX,
8892                 .policy         = nft_table_policy,
8893         },
8894         [NFT_MSG_DESTROYTABLE] = {
8895                 .call           = nf_tables_deltable,
8896                 .type           = NFNL_CB_BATCH,
8897                 .attr_count     = NFTA_TABLE_MAX,
8898                 .policy         = nft_table_policy,
8899         },
8900         [NFT_MSG_NEWCHAIN] = {
8901                 .call           = nf_tables_newchain,
8902                 .type           = NFNL_CB_BATCH,
8903                 .attr_count     = NFTA_CHAIN_MAX,
8904                 .policy         = nft_chain_policy,
8905         },
8906         [NFT_MSG_GETCHAIN] = {
8907                 .call           = nf_tables_getchain,
8908                 .type           = NFNL_CB_RCU,
8909                 .attr_count     = NFTA_CHAIN_MAX,
8910                 .policy         = nft_chain_policy,
8911         },
8912         [NFT_MSG_DELCHAIN] = {
8913                 .call           = nf_tables_delchain,
8914                 .type           = NFNL_CB_BATCH,
8915                 .attr_count     = NFTA_CHAIN_MAX,
8916                 .policy         = nft_chain_policy,
8917         },
8918         [NFT_MSG_DESTROYCHAIN] = {
8919                 .call           = nf_tables_delchain,
8920                 .type           = NFNL_CB_BATCH,
8921                 .attr_count     = NFTA_CHAIN_MAX,
8922                 .policy         = nft_chain_policy,
8923         },
8924         [NFT_MSG_NEWRULE] = {
8925                 .call           = nf_tables_newrule,
8926                 .type           = NFNL_CB_BATCH,
8927                 .attr_count     = NFTA_RULE_MAX,
8928                 .policy         = nft_rule_policy,
8929         },
8930         [NFT_MSG_GETRULE] = {
8931                 .call           = nf_tables_getrule,
8932                 .type           = NFNL_CB_RCU,
8933                 .attr_count     = NFTA_RULE_MAX,
8934                 .policy         = nft_rule_policy,
8935         },
8936         [NFT_MSG_GETRULE_RESET] = {
8937                 .call           = nf_tables_getrule,
8938                 .type           = NFNL_CB_RCU,
8939                 .attr_count     = NFTA_RULE_MAX,
8940                 .policy         = nft_rule_policy,
8941         },
8942         [NFT_MSG_DELRULE] = {
8943                 .call           = nf_tables_delrule,
8944                 .type           = NFNL_CB_BATCH,
8945                 .attr_count     = NFTA_RULE_MAX,
8946                 .policy         = nft_rule_policy,
8947         },
8948         [NFT_MSG_DESTROYRULE] = {
8949                 .call           = nf_tables_delrule,
8950                 .type           = NFNL_CB_BATCH,
8951                 .attr_count     = NFTA_RULE_MAX,
8952                 .policy         = nft_rule_policy,
8953         },
8954         [NFT_MSG_NEWSET] = {
8955                 .call           = nf_tables_newset,
8956                 .type           = NFNL_CB_BATCH,
8957                 .attr_count     = NFTA_SET_MAX,
8958                 .policy         = nft_set_policy,
8959         },
8960         [NFT_MSG_GETSET] = {
8961                 .call           = nf_tables_getset,
8962                 .type           = NFNL_CB_RCU,
8963                 .attr_count     = NFTA_SET_MAX,
8964                 .policy         = nft_set_policy,
8965         },
8966         [NFT_MSG_DELSET] = {
8967                 .call           = nf_tables_delset,
8968                 .type           = NFNL_CB_BATCH,
8969                 .attr_count     = NFTA_SET_MAX,
8970                 .policy         = nft_set_policy,
8971         },
8972         [NFT_MSG_DESTROYSET] = {
8973                 .call           = nf_tables_delset,
8974                 .type           = NFNL_CB_BATCH,
8975                 .attr_count     = NFTA_SET_MAX,
8976                 .policy         = nft_set_policy,
8977         },
8978         [NFT_MSG_NEWSETELEM] = {
8979                 .call           = nf_tables_newsetelem,
8980                 .type           = NFNL_CB_BATCH,
8981                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8982                 .policy         = nft_set_elem_list_policy,
8983         },
8984         [NFT_MSG_GETSETELEM] = {
8985                 .call           = nf_tables_getsetelem,
8986                 .type           = NFNL_CB_RCU,
8987                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8988                 .policy         = nft_set_elem_list_policy,
8989         },
8990         [NFT_MSG_GETSETELEM_RESET] = {
8991                 .call           = nf_tables_getsetelem,
8992                 .type           = NFNL_CB_RCU,
8993                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8994                 .policy         = nft_set_elem_list_policy,
8995         },
8996         [NFT_MSG_DELSETELEM] = {
8997                 .call           = nf_tables_delsetelem,
8998                 .type           = NFNL_CB_BATCH,
8999                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9000                 .policy         = nft_set_elem_list_policy,
9001         },
9002         [NFT_MSG_DESTROYSETELEM] = {
9003                 .call           = nf_tables_delsetelem,
9004                 .type           = NFNL_CB_BATCH,
9005                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
9006                 .policy         = nft_set_elem_list_policy,
9007         },
9008         [NFT_MSG_GETGEN] = {
9009                 .call           = nf_tables_getgen,
9010                 .type           = NFNL_CB_RCU,
9011         },
9012         [NFT_MSG_NEWOBJ] = {
9013                 .call           = nf_tables_newobj,
9014                 .type           = NFNL_CB_BATCH,
9015                 .attr_count     = NFTA_OBJ_MAX,
9016                 .policy         = nft_obj_policy,
9017         },
9018         [NFT_MSG_GETOBJ] = {
9019                 .call           = nf_tables_getobj,
9020                 .type           = NFNL_CB_RCU,
9021                 .attr_count     = NFTA_OBJ_MAX,
9022                 .policy         = nft_obj_policy,
9023         },
9024         [NFT_MSG_DELOBJ] = {
9025                 .call           = nf_tables_delobj,
9026                 .type           = NFNL_CB_BATCH,
9027                 .attr_count     = NFTA_OBJ_MAX,
9028                 .policy         = nft_obj_policy,
9029         },
9030         [NFT_MSG_DESTROYOBJ] = {
9031                 .call           = nf_tables_delobj,
9032                 .type           = NFNL_CB_BATCH,
9033                 .attr_count     = NFTA_OBJ_MAX,
9034                 .policy         = nft_obj_policy,
9035         },
9036         [NFT_MSG_GETOBJ_RESET] = {
9037                 .call           = nf_tables_getobj,
9038                 .type           = NFNL_CB_RCU,
9039                 .attr_count     = NFTA_OBJ_MAX,
9040                 .policy         = nft_obj_policy,
9041         },
9042         [NFT_MSG_NEWFLOWTABLE] = {
9043                 .call           = nf_tables_newflowtable,
9044                 .type           = NFNL_CB_BATCH,
9045                 .attr_count     = NFTA_FLOWTABLE_MAX,
9046                 .policy         = nft_flowtable_policy,
9047         },
9048         [NFT_MSG_GETFLOWTABLE] = {
9049                 .call           = nf_tables_getflowtable,
9050                 .type           = NFNL_CB_RCU,
9051                 .attr_count     = NFTA_FLOWTABLE_MAX,
9052                 .policy         = nft_flowtable_policy,
9053         },
9054         [NFT_MSG_DELFLOWTABLE] = {
9055                 .call           = nf_tables_delflowtable,
9056                 .type           = NFNL_CB_BATCH,
9057                 .attr_count     = NFTA_FLOWTABLE_MAX,
9058                 .policy         = nft_flowtable_policy,
9059         },
9060         [NFT_MSG_DESTROYFLOWTABLE] = {
9061                 .call           = nf_tables_delflowtable,
9062                 .type           = NFNL_CB_BATCH,
9063                 .attr_count     = NFTA_FLOWTABLE_MAX,
9064                 .policy         = nft_flowtable_policy,
9065         },
9066 };
9067
9068 static int nf_tables_validate(struct net *net)
9069 {
9070         struct nftables_pernet *nft_net = nft_pernet(net);
9071         struct nft_table *table;
9072
9073         list_for_each_entry(table, &nft_net->tables, list) {
9074                 switch (table->validate_state) {
9075                 case NFT_VALIDATE_SKIP:
9076                         continue;
9077                 case NFT_VALIDATE_NEED:
9078                         nft_validate_state_update(table, NFT_VALIDATE_DO);
9079                         fallthrough;
9080                 case NFT_VALIDATE_DO:
9081                         if (nft_table_validate(net, table) < 0)
9082                                 return -EAGAIN;
9083
9084                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9085                 }
9086
9087                 break;
9088         }
9089
9090         return 0;
9091 }
9092
9093 /* a drop policy has to be deferred until all rules have been activated,
9094  * otherwise a large ruleset that contains a drop-policy base chain will
9095  * cause all packets to get dropped until the full transaction has been
9096  * processed.
9097  *
9098  * We defer the drop policy until the transaction has been finalized.
9099  */
9100 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9101 {
9102         struct nft_base_chain *basechain;
9103
9104         if (nft_trans_chain_policy(trans) != NF_DROP)
9105                 return;
9106
9107         if (!nft_is_base_chain(trans->ctx.chain))
9108                 return;
9109
9110         basechain = nft_base_chain(trans->ctx.chain);
9111         basechain->policy = NF_DROP;
9112 }
9113
9114 static void nft_chain_commit_update(struct nft_trans *trans)
9115 {
9116         struct nft_base_chain *basechain;
9117
9118         if (nft_trans_chain_name(trans)) {
9119                 rhltable_remove(&trans->ctx.table->chains_ht,
9120                                 &trans->ctx.chain->rhlhead,
9121                                 nft_chain_ht_params);
9122                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9123                 rhltable_insert_key(&trans->ctx.table->chains_ht,
9124                                     trans->ctx.chain->name,
9125                                     &trans->ctx.chain->rhlhead,
9126                                     nft_chain_ht_params);
9127         }
9128
9129         if (!nft_is_base_chain(trans->ctx.chain))
9130                 return;
9131
9132         nft_chain_stats_replace(trans);
9133
9134         basechain = nft_base_chain(trans->ctx.chain);
9135
9136         switch (nft_trans_chain_policy(trans)) {
9137         case NF_DROP:
9138         case NF_ACCEPT:
9139                 basechain->policy = nft_trans_chain_policy(trans);
9140                 break;
9141         }
9142 }
9143
9144 static void nft_obj_commit_update(struct nft_trans *trans)
9145 {
9146         struct nft_object *newobj;
9147         struct nft_object *obj;
9148
9149         obj = nft_trans_obj(trans);
9150         newobj = nft_trans_obj_newobj(trans);
9151
9152         if (obj->ops->update)
9153                 obj->ops->update(obj, newobj);
9154
9155         nft_obj_destroy(&trans->ctx, newobj);
9156 }
9157
9158 static void nft_commit_release(struct nft_trans *trans)
9159 {
9160         switch (trans->msg_type) {
9161         case NFT_MSG_DELTABLE:
9162         case NFT_MSG_DESTROYTABLE:
9163                 nf_tables_table_destroy(&trans->ctx);
9164                 break;
9165         case NFT_MSG_NEWCHAIN:
9166                 free_percpu(nft_trans_chain_stats(trans));
9167                 kfree(nft_trans_chain_name(trans));
9168                 break;
9169         case NFT_MSG_DELCHAIN:
9170         case NFT_MSG_DESTROYCHAIN:
9171                 if (nft_trans_chain_update(trans))
9172                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9173                 else
9174                         nf_tables_chain_destroy(&trans->ctx);
9175                 break;
9176         case NFT_MSG_DELRULE:
9177         case NFT_MSG_DESTROYRULE:
9178                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9179                 break;
9180         case NFT_MSG_DELSET:
9181         case NFT_MSG_DESTROYSET:
9182                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9183                 break;
9184         case NFT_MSG_DELSETELEM:
9185         case NFT_MSG_DESTROYSETELEM:
9186                 nf_tables_set_elem_destroy(&trans->ctx,
9187                                            nft_trans_elem_set(trans),
9188                                            nft_trans_elem(trans).priv);
9189                 break;
9190         case NFT_MSG_DELOBJ:
9191         case NFT_MSG_DESTROYOBJ:
9192                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9193                 break;
9194         case NFT_MSG_DELFLOWTABLE:
9195         case NFT_MSG_DESTROYFLOWTABLE:
9196                 if (nft_trans_flowtable_update(trans))
9197                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9198                 else
9199                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9200                 break;
9201         }
9202
9203         if (trans->put_net)
9204                 put_net(trans->ctx.net);
9205
9206         kfree(trans);
9207 }
9208
9209 static void nf_tables_trans_destroy_work(struct work_struct *w)
9210 {
9211         struct nft_trans *trans, *next;
9212         LIST_HEAD(head);
9213
9214         spin_lock(&nf_tables_destroy_list_lock);
9215         list_splice_init(&nf_tables_destroy_list, &head);
9216         spin_unlock(&nf_tables_destroy_list_lock);
9217
9218         if (list_empty(&head))
9219                 return;
9220
9221         synchronize_rcu();
9222
9223         list_for_each_entry_safe(trans, next, &head, list) {
9224                 nft_trans_list_del(trans);
9225                 nft_commit_release(trans);
9226         }
9227 }
9228
9229 void nf_tables_trans_destroy_flush_work(void)
9230 {
9231         flush_work(&trans_destroy_work);
9232 }
9233 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9234
9235 static bool nft_expr_reduce(struct nft_regs_track *track,
9236                             const struct nft_expr *expr)
9237 {
9238         return false;
9239 }
9240
9241 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9242 {
9243         const struct nft_expr *expr, *last;
9244         struct nft_regs_track track = {};
9245         unsigned int size, data_size;
9246         void *data, *data_boundary;
9247         struct nft_rule_dp *prule;
9248         struct nft_rule *rule;
9249
9250         /* already handled or inactive chain? */
9251         if (chain->blob_next || !nft_is_active_next(net, chain))
9252                 return 0;
9253
9254         data_size = 0;
9255         list_for_each_entry(rule, &chain->rules, list) {
9256                 if (nft_is_active_next(net, rule)) {
9257                         data_size += sizeof(*prule) + rule->dlen;
9258                         if (data_size > INT_MAX)
9259                                 return -ENOMEM;
9260                 }
9261         }
9262
9263         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9264         if (!chain->blob_next)
9265                 return -ENOMEM;
9266
9267         data = (void *)chain->blob_next->data;
9268         data_boundary = data + data_size;
9269         size = 0;
9270
9271         list_for_each_entry(rule, &chain->rules, list) {
9272                 if (!nft_is_active_next(net, rule))
9273                         continue;
9274
9275                 prule = (struct nft_rule_dp *)data;
9276                 data += offsetof(struct nft_rule_dp, data);
9277                 if (WARN_ON_ONCE(data > data_boundary))
9278                         return -ENOMEM;
9279
9280                 size = 0;
9281                 track.last = nft_expr_last(rule);
9282                 nft_rule_for_each_expr(expr, last, rule) {
9283                         track.cur = expr;
9284
9285                         if (nft_expr_reduce(&track, expr)) {
9286                                 expr = track.cur;
9287                                 continue;
9288                         }
9289
9290                         if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9291                                 return -ENOMEM;
9292
9293                         memcpy(data + size, expr, expr->ops->size);
9294                         size += expr->ops->size;
9295                 }
9296                 if (WARN_ON_ONCE(size >= 1 << 12))
9297                         return -ENOMEM;
9298
9299                 prule->handle = rule->handle;
9300                 prule->dlen = size;
9301                 prule->is_last = 0;
9302
9303                 data += size;
9304                 size = 0;
9305                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9306         }
9307
9308         if (WARN_ON_ONCE(data > data_boundary))
9309                 return -ENOMEM;
9310
9311         prule = (struct nft_rule_dp *)data;
9312         nft_last_rule(chain, prule);
9313
9314         return 0;
9315 }
9316
9317 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9318 {
9319         struct nftables_pernet *nft_net = nft_pernet(net);
9320         struct nft_trans *trans, *next;
9321
9322         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9323                 struct nft_chain *chain = trans->ctx.chain;
9324
9325                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9326                     trans->msg_type == NFT_MSG_DELRULE) {
9327                         kvfree(chain->blob_next);
9328                         chain->blob_next = NULL;
9329                 }
9330         }
9331 }
9332
9333 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9334 {
9335         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9336
9337         kvfree(l->blob);
9338 }
9339
9340 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9341 {
9342         struct nft_rule_dp_last *last;
9343
9344         /* last rule trailer is after end marker */
9345         last = (void *)blob + sizeof(*blob) + blob->size;
9346         last->blob = blob;
9347
9348         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9349 }
9350
9351 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9352 {
9353         struct nft_rule_blob *g0, *g1;
9354         bool next_genbit;
9355
9356         next_genbit = nft_gencursor_next(net);
9357
9358         g0 = rcu_dereference_protected(chain->blob_gen_0,
9359                                        lockdep_commit_lock_is_held(net));
9360         g1 = rcu_dereference_protected(chain->blob_gen_1,
9361                                        lockdep_commit_lock_is_held(net));
9362
9363         /* No changes to this chain? */
9364         if (chain->blob_next == NULL) {
9365                 /* chain had no change in last or next generation */
9366                 if (g0 == g1)
9367                         return;
9368                 /*
9369                  * chain had no change in this generation; make sure next
9370                  * one uses same rules as current generation.
9371                  */
9372                 if (next_genbit) {
9373                         rcu_assign_pointer(chain->blob_gen_1, g0);
9374                         nf_tables_commit_chain_free_rules_old(g1);
9375                 } else {
9376                         rcu_assign_pointer(chain->blob_gen_0, g1);
9377                         nf_tables_commit_chain_free_rules_old(g0);
9378                 }
9379
9380                 return;
9381         }
9382
9383         if (next_genbit)
9384                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9385         else
9386                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9387
9388         chain->blob_next = NULL;
9389
9390         if (g0 == g1)
9391                 return;
9392
9393         if (next_genbit)
9394                 nf_tables_commit_chain_free_rules_old(g1);
9395         else
9396                 nf_tables_commit_chain_free_rules_old(g0);
9397 }
9398
9399 static void nft_obj_del(struct nft_object *obj)
9400 {
9401         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9402         list_del_rcu(&obj->list);
9403 }
9404
9405 void nft_chain_del(struct nft_chain *chain)
9406 {
9407         struct nft_table *table = chain->table;
9408
9409         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9410                                      nft_chain_ht_params));
9411         list_del_rcu(&chain->list);
9412 }
9413
9414 static void nf_tables_module_autoload_cleanup(struct net *net)
9415 {
9416         struct nftables_pernet *nft_net = nft_pernet(net);
9417         struct nft_module_request *req, *next;
9418
9419         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9420         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9421                 WARN_ON_ONCE(!req->done);
9422                 list_del(&req->list);
9423                 kfree(req);
9424         }
9425 }
9426
9427 static void nf_tables_commit_release(struct net *net)
9428 {
9429         struct nftables_pernet *nft_net = nft_pernet(net);
9430         struct nft_trans *trans;
9431
9432         /* all side effects have to be made visible.
9433          * For example, if a chain named 'foo' has been deleted, a
9434          * new transaction must not find it anymore.
9435          *
9436          * Memory reclaim happens asynchronously from work queue
9437          * to prevent expensive synchronize_rcu() in commit phase.
9438          */
9439         if (list_empty(&nft_net->commit_list)) {
9440                 nf_tables_module_autoload_cleanup(net);
9441                 mutex_unlock(&nft_net->commit_mutex);
9442                 return;
9443         }
9444
9445         trans = list_last_entry(&nft_net->commit_list,
9446                                 struct nft_trans, list);
9447         get_net(trans->ctx.net);
9448         WARN_ON_ONCE(trans->put_net);
9449
9450         trans->put_net = true;
9451         spin_lock(&nf_tables_destroy_list_lock);
9452         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9453         spin_unlock(&nf_tables_destroy_list_lock);
9454
9455         nf_tables_module_autoload_cleanup(net);
9456         schedule_work(&trans_destroy_work);
9457
9458         mutex_unlock(&nft_net->commit_mutex);
9459 }
9460
9461 static void nft_commit_notify(struct net *net, u32 portid)
9462 {
9463         struct nftables_pernet *nft_net = nft_pernet(net);
9464         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9465         unsigned char *data;
9466         int len;
9467
9468         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9469                 if (!batch_skb) {
9470 new_batch:
9471                         batch_skb = skb;
9472                         len = NLMSG_GOODSIZE - skb->len;
9473                         list_del(&skb->list);
9474                         continue;
9475                 }
9476                 len -= skb->len;
9477                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9478                         data = skb_put(batch_skb, skb->len);
9479                         memcpy(data, skb->data, skb->len);
9480                         list_del(&skb->list);
9481                         kfree_skb(skb);
9482                         continue;
9483                 }
9484                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9485                                NFT_CB(batch_skb).report, GFP_KERNEL);
9486                 goto new_batch;
9487         }
9488
9489         if (batch_skb) {
9490                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9491                                NFT_CB(batch_skb).report, GFP_KERNEL);
9492         }
9493
9494         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9495 }
9496
9497 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9498                                         struct nft_table *table)
9499 {
9500         struct nft_audit_data *adp;
9501
9502         list_for_each_entry(adp, adl, list) {
9503                 if (adp->table == table)
9504                         return 0;
9505         }
9506         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9507         if (!adp)
9508                 return -ENOMEM;
9509         adp->table = table;
9510         list_add(&adp->list, adl);
9511         return 0;
9512 }
9513
9514 static void nf_tables_commit_audit_free(struct list_head *adl)
9515 {
9516         struct nft_audit_data *adp, *adn;
9517
9518         list_for_each_entry_safe(adp, adn, adl, list) {
9519                 list_del(&adp->list);
9520                 kfree(adp);
9521         }
9522 }
9523
9524 static void nf_tables_commit_audit_collect(struct list_head *adl,
9525                                            struct nft_table *table, u32 op)
9526 {
9527         struct nft_audit_data *adp;
9528
9529         list_for_each_entry(adp, adl, list) {
9530                 if (adp->table == table)
9531                         goto found;
9532         }
9533         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9534         return;
9535 found:
9536         adp->entries++;
9537         if (!adp->op || adp->op > op)
9538                 adp->op = op;
9539 }
9540
9541 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9542
9543 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9544 {
9545         struct nft_audit_data *adp, *adn;
9546         char aubuf[AUNFTABLENAMELEN];
9547
9548         list_for_each_entry_safe(adp, adn, adl, list) {
9549                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9550                          generation);
9551                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9552                                 nft2audit_op[adp->op], GFP_KERNEL);
9553                 list_del(&adp->list);
9554                 kfree(adp);
9555         }
9556 }
9557
9558 static void nft_set_commit_update(struct list_head *set_update_list)
9559 {
9560         struct nft_set *set, *next;
9561
9562         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9563                 list_del_init(&set->pending_update);
9564
9565                 if (!set->ops->commit)
9566                         continue;
9567
9568                 set->ops->commit(set);
9569         }
9570 }
9571
9572 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9573 {
9574         struct nftables_pernet *nft_net = nft_pernet(net);
9575         struct nft_trans *trans, *next;
9576         LIST_HEAD(set_update_list);
9577         struct nft_trans_elem *te;
9578         struct nft_chain *chain;
9579         struct nft_table *table;
9580         unsigned int base_seq;
9581         LIST_HEAD(adl);
9582         int err;
9583
9584         if (list_empty(&nft_net->commit_list)) {
9585                 mutex_unlock(&nft_net->commit_mutex);
9586                 return 0;
9587         }
9588
9589         list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9590                 switch (trans->msg_type) {
9591                 case NFT_MSG_NEWSET:
9592                         if (!nft_trans_set_update(trans) &&
9593                             nft_set_is_anonymous(nft_trans_set(trans)) &&
9594                             !nft_trans_set_bound(trans)) {
9595                                 pr_warn_once("nftables ruleset with unbound set\n");
9596                                 return -EINVAL;
9597                         }
9598                         break;
9599                 case NFT_MSG_NEWCHAIN:
9600                         if (!nft_trans_chain_update(trans) &&
9601                             nft_chain_binding(nft_trans_chain(trans)) &&
9602                             !nft_trans_chain_bound(trans)) {
9603                                 pr_warn_once("nftables ruleset with unbound chain\n");
9604                                 return -EINVAL;
9605                         }
9606                         break;
9607                 }
9608         }
9609
9610         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9611         if (nf_tables_validate(net) < 0)
9612                 return -EAGAIN;
9613
9614         err = nft_flow_rule_offload_commit(net);
9615         if (err < 0)
9616                 return err;
9617
9618         /* 1.  Allocate space for next generation rules_gen_X[] */
9619         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9620                 int ret;
9621
9622                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9623                 if (ret) {
9624                         nf_tables_commit_chain_prepare_cancel(net);
9625                         nf_tables_commit_audit_free(&adl);
9626                         return ret;
9627                 }
9628                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9629                     trans->msg_type == NFT_MSG_DELRULE) {
9630                         chain = trans->ctx.chain;
9631
9632                         ret = nf_tables_commit_chain_prepare(net, chain);
9633                         if (ret < 0) {
9634                                 nf_tables_commit_chain_prepare_cancel(net);
9635                                 nf_tables_commit_audit_free(&adl);
9636                                 return ret;
9637                         }
9638                 }
9639         }
9640
9641         /* step 2.  Make rules_gen_X visible to packet path */
9642         list_for_each_entry(table, &nft_net->tables, list) {
9643                 list_for_each_entry(chain, &table->chains, list)
9644                         nf_tables_commit_chain(net, chain);
9645         }
9646
9647         /*
9648          * Bump generation counter, invalidate any dump in progress.
9649          * Cannot fail after this point.
9650          */
9651         base_seq = READ_ONCE(nft_net->base_seq);
9652         while (++base_seq == 0)
9653                 ;
9654
9655         WRITE_ONCE(nft_net->base_seq, base_seq);
9656
9657         /* step 3. Start new generation, rules_gen_X now in use. */
9658         net->nft.gencursor = nft_gencursor_next(net);
9659
9660         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9661                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9662                                                trans->msg_type);
9663                 switch (trans->msg_type) {
9664                 case NFT_MSG_NEWTABLE:
9665                         if (nft_trans_table_update(trans)) {
9666                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9667                                         nft_trans_destroy(trans);
9668                                         break;
9669                                 }
9670                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9671                                         nf_tables_table_disable(net, trans->ctx.table);
9672
9673                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9674                         } else {
9675                                 nft_clear(net, trans->ctx.table);
9676                         }
9677                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9678                         nft_trans_destroy(trans);
9679                         break;
9680                 case NFT_MSG_DELTABLE:
9681                 case NFT_MSG_DESTROYTABLE:
9682                         list_del_rcu(&trans->ctx.table->list);
9683                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9684                         break;
9685                 case NFT_MSG_NEWCHAIN:
9686                         if (nft_trans_chain_update(trans)) {
9687                                 nft_chain_commit_update(trans);
9688                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9689                                                        &nft_trans_chain_hooks(trans));
9690                                 list_splice(&nft_trans_chain_hooks(trans),
9691                                             &nft_trans_basechain(trans)->hook_list);
9692                                 /* trans destroyed after rcu grace period */
9693                         } else {
9694                                 nft_chain_commit_drop_policy(trans);
9695                                 nft_clear(net, trans->ctx.chain);
9696                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9697                                 nft_trans_destroy(trans);
9698                         }
9699                         break;
9700                 case NFT_MSG_DELCHAIN:
9701                 case NFT_MSG_DESTROYCHAIN:
9702                         if (nft_trans_chain_update(trans)) {
9703                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9704                                                        &nft_trans_chain_hooks(trans));
9705                                 nft_netdev_unregister_hooks(net,
9706                                                             &nft_trans_chain_hooks(trans),
9707                                                             true);
9708                         } else {
9709                                 nft_chain_del(trans->ctx.chain);
9710                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9711                                                        NULL);
9712                                 nf_tables_unregister_hook(trans->ctx.net,
9713                                                           trans->ctx.table,
9714                                                           trans->ctx.chain);
9715                         }
9716                         break;
9717                 case NFT_MSG_NEWRULE:
9718                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9719                         nf_tables_rule_notify(&trans->ctx,
9720                                               nft_trans_rule(trans),
9721                                               NFT_MSG_NEWRULE);
9722                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9723                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9724
9725                         nft_trans_destroy(trans);
9726                         break;
9727                 case NFT_MSG_DELRULE:
9728                 case NFT_MSG_DESTROYRULE:
9729                         list_del_rcu(&nft_trans_rule(trans)->list);
9730                         nf_tables_rule_notify(&trans->ctx,
9731                                               nft_trans_rule(trans),
9732                                               trans->msg_type);
9733                         nft_rule_expr_deactivate(&trans->ctx,
9734                                                  nft_trans_rule(trans),
9735                                                  NFT_TRANS_COMMIT);
9736
9737                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9738                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9739                         break;
9740                 case NFT_MSG_NEWSET:
9741                         if (nft_trans_set_update(trans)) {
9742                                 struct nft_set *set = nft_trans_set(trans);
9743
9744                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9745                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9746
9747                                 if (nft_trans_set_size(trans))
9748                                         WRITE_ONCE(set->size, nft_trans_set_size(trans));
9749                         } else {
9750                                 nft_clear(net, nft_trans_set(trans));
9751                                 /* This avoids hitting -EBUSY when deleting the table
9752                                  * from the transaction.
9753                                  */
9754                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9755                                     !list_empty(&nft_trans_set(trans)->bindings))
9756                                         nft_use_dec(&trans->ctx.table->use);
9757                         }
9758                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9759                                              NFT_MSG_NEWSET, GFP_KERNEL);
9760                         nft_trans_destroy(trans);
9761                         break;
9762                 case NFT_MSG_DELSET:
9763                 case NFT_MSG_DESTROYSET:
9764                         list_del_rcu(&nft_trans_set(trans)->list);
9765                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9766                                              trans->msg_type, GFP_KERNEL);
9767                         break;
9768                 case NFT_MSG_NEWSETELEM:
9769                         te = (struct nft_trans_elem *)trans->data;
9770
9771                         nft_setelem_activate(net, te->set, &te->elem);
9772                         nf_tables_setelem_notify(&trans->ctx, te->set,
9773                                                  &te->elem,
9774                                                  NFT_MSG_NEWSETELEM);
9775                         if (te->set->ops->commit &&
9776                             list_empty(&te->set->pending_update)) {
9777                                 list_add_tail(&te->set->pending_update,
9778                                               &set_update_list);
9779                         }
9780                         nft_trans_destroy(trans);
9781                         break;
9782                 case NFT_MSG_DELSETELEM:
9783                 case NFT_MSG_DESTROYSETELEM:
9784                         te = (struct nft_trans_elem *)trans->data;
9785
9786                         nf_tables_setelem_notify(&trans->ctx, te->set,
9787                                                  &te->elem,
9788                                                  trans->msg_type);
9789                         nft_setelem_remove(net, te->set, &te->elem);
9790                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9791                                 atomic_dec(&te->set->nelems);
9792                                 te->set->ndeact--;
9793                         }
9794                         if (te->set->ops->commit &&
9795                             list_empty(&te->set->pending_update)) {
9796                                 list_add_tail(&te->set->pending_update,
9797                                               &set_update_list);
9798                         }
9799                         break;
9800                 case NFT_MSG_NEWOBJ:
9801                         if (nft_trans_obj_update(trans)) {
9802                                 nft_obj_commit_update(trans);
9803                                 nf_tables_obj_notify(&trans->ctx,
9804                                                      nft_trans_obj(trans),
9805                                                      NFT_MSG_NEWOBJ);
9806                         } else {
9807                                 nft_clear(net, nft_trans_obj(trans));
9808                                 nf_tables_obj_notify(&trans->ctx,
9809                                                      nft_trans_obj(trans),
9810                                                      NFT_MSG_NEWOBJ);
9811                                 nft_trans_destroy(trans);
9812                         }
9813                         break;
9814                 case NFT_MSG_DELOBJ:
9815                 case NFT_MSG_DESTROYOBJ:
9816                         nft_obj_del(nft_trans_obj(trans));
9817                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9818                                              trans->msg_type);
9819                         break;
9820                 case NFT_MSG_NEWFLOWTABLE:
9821                         if (nft_trans_flowtable_update(trans)) {
9822                                 nft_trans_flowtable(trans)->data.flags =
9823                                         nft_trans_flowtable_flags(trans);
9824                                 nf_tables_flowtable_notify(&trans->ctx,
9825                                                            nft_trans_flowtable(trans),
9826                                                            &nft_trans_flowtable_hooks(trans),
9827                                                            NFT_MSG_NEWFLOWTABLE);
9828                                 list_splice(&nft_trans_flowtable_hooks(trans),
9829                                             &nft_trans_flowtable(trans)->hook_list);
9830                         } else {
9831                                 nft_clear(net, nft_trans_flowtable(trans));
9832                                 nf_tables_flowtable_notify(&trans->ctx,
9833                                                            nft_trans_flowtable(trans),
9834                                                            NULL,
9835                                                            NFT_MSG_NEWFLOWTABLE);
9836                         }
9837                         nft_trans_destroy(trans);
9838                         break;
9839                 case NFT_MSG_DELFLOWTABLE:
9840                 case NFT_MSG_DESTROYFLOWTABLE:
9841                         if (nft_trans_flowtable_update(trans)) {
9842                                 nf_tables_flowtable_notify(&trans->ctx,
9843                                                            nft_trans_flowtable(trans),
9844                                                            &nft_trans_flowtable_hooks(trans),
9845                                                            trans->msg_type);
9846                                 nft_unregister_flowtable_net_hooks(net,
9847                                                                    &nft_trans_flowtable_hooks(trans));
9848                         } else {
9849                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9850                                 nf_tables_flowtable_notify(&trans->ctx,
9851                                                            nft_trans_flowtable(trans),
9852                                                            NULL,
9853                                                            trans->msg_type);
9854                                 nft_unregister_flowtable_net_hooks(net,
9855                                                 &nft_trans_flowtable(trans)->hook_list);
9856                         }
9857                         break;
9858                 }
9859         }
9860
9861         nft_set_commit_update(&set_update_list);
9862
9863         nft_commit_notify(net, NETLINK_CB(skb).portid);
9864         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9865         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9866         nf_tables_commit_release(net);
9867
9868         return 0;
9869 }
9870
9871 static void nf_tables_module_autoload(struct net *net)
9872 {
9873         struct nftables_pernet *nft_net = nft_pernet(net);
9874         struct nft_module_request *req, *next;
9875         LIST_HEAD(module_list);
9876
9877         list_splice_init(&nft_net->module_list, &module_list);
9878         mutex_unlock(&nft_net->commit_mutex);
9879         list_for_each_entry_safe(req, next, &module_list, list) {
9880                 request_module("%s", req->module);
9881                 req->done = true;
9882         }
9883         mutex_lock(&nft_net->commit_mutex);
9884         list_splice(&module_list, &nft_net->module_list);
9885 }
9886
9887 static void nf_tables_abort_release(struct nft_trans *trans)
9888 {
9889         switch (trans->msg_type) {
9890         case NFT_MSG_NEWTABLE:
9891                 nf_tables_table_destroy(&trans->ctx);
9892                 break;
9893         case NFT_MSG_NEWCHAIN:
9894                 if (nft_trans_chain_update(trans))
9895                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9896                 else
9897                         nf_tables_chain_destroy(&trans->ctx);
9898                 break;
9899         case NFT_MSG_NEWRULE:
9900                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9901                 break;
9902         case NFT_MSG_NEWSET:
9903                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9904                 break;
9905         case NFT_MSG_NEWSETELEM:
9906                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9907                                      nft_trans_elem(trans).priv, true);
9908                 break;
9909         case NFT_MSG_NEWOBJ:
9910                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9911                 break;
9912         case NFT_MSG_NEWFLOWTABLE:
9913                 if (nft_trans_flowtable_update(trans))
9914                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9915                 else
9916                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9917                 break;
9918         }
9919         kfree(trans);
9920 }
9921
9922 static void nft_set_abort_update(struct list_head *set_update_list)
9923 {
9924         struct nft_set *set, *next;
9925
9926         list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9927                 list_del_init(&set->pending_update);
9928
9929                 if (!set->ops->abort)
9930                         continue;
9931
9932                 set->ops->abort(set);
9933         }
9934 }
9935
9936 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9937 {
9938         struct nftables_pernet *nft_net = nft_pernet(net);
9939         struct nft_trans *trans, *next;
9940         LIST_HEAD(set_update_list);
9941         struct nft_trans_elem *te;
9942
9943         if (action == NFNL_ABORT_VALIDATE &&
9944             nf_tables_validate(net) < 0)
9945                 return -EAGAIN;
9946
9947         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9948                                          list) {
9949                 switch (trans->msg_type) {
9950                 case NFT_MSG_NEWTABLE:
9951                         if (nft_trans_table_update(trans)) {
9952                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9953                                         nft_trans_destroy(trans);
9954                                         break;
9955                                 }
9956                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9957                                         nf_tables_table_disable(net, trans->ctx.table);
9958                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9959                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9960                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9961                                 }
9962                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9963                                 nft_trans_destroy(trans);
9964                         } else {
9965                                 list_del_rcu(&trans->ctx.table->list);
9966                         }
9967                         break;
9968                 case NFT_MSG_DELTABLE:
9969                 case NFT_MSG_DESTROYTABLE:
9970                         nft_clear(trans->ctx.net, trans->ctx.table);
9971                         nft_trans_destroy(trans);
9972                         break;
9973                 case NFT_MSG_NEWCHAIN:
9974                         if (nft_trans_chain_update(trans)) {
9975                                 nft_netdev_unregister_hooks(net,
9976                                                             &nft_trans_chain_hooks(trans),
9977                                                             true);
9978                                 free_percpu(nft_trans_chain_stats(trans));
9979                                 kfree(nft_trans_chain_name(trans));
9980                                 nft_trans_destroy(trans);
9981                         } else {
9982                                 if (nft_trans_chain_bound(trans)) {
9983                                         nft_trans_destroy(trans);
9984                                         break;
9985                                 }
9986                                 nft_use_dec_restore(&trans->ctx.table->use);
9987                                 nft_chain_del(trans->ctx.chain);
9988                                 nf_tables_unregister_hook(trans->ctx.net,
9989                                                           trans->ctx.table,
9990                                                           trans->ctx.chain);
9991                         }
9992                         break;
9993                 case NFT_MSG_DELCHAIN:
9994                 case NFT_MSG_DESTROYCHAIN:
9995                         if (nft_trans_chain_update(trans)) {
9996                                 list_splice(&nft_trans_chain_hooks(trans),
9997                                             &nft_trans_basechain(trans)->hook_list);
9998                         } else {
9999                                 nft_use_inc_restore(&trans->ctx.table->use);
10000                                 nft_clear(trans->ctx.net, trans->ctx.chain);
10001                         }
10002                         nft_trans_destroy(trans);
10003                         break;
10004                 case NFT_MSG_NEWRULE:
10005                         if (nft_trans_rule_bound(trans)) {
10006                                 nft_trans_destroy(trans);
10007                                 break;
10008                         }
10009                         nft_use_dec_restore(&trans->ctx.chain->use);
10010                         list_del_rcu(&nft_trans_rule(trans)->list);
10011                         nft_rule_expr_deactivate(&trans->ctx,
10012                                                  nft_trans_rule(trans),
10013                                                  NFT_TRANS_ABORT);
10014                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10015                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10016                         break;
10017                 case NFT_MSG_DELRULE:
10018                 case NFT_MSG_DESTROYRULE:
10019                         nft_use_inc_restore(&trans->ctx.chain->use);
10020                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
10021                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10022                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10023                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10024
10025                         nft_trans_destroy(trans);
10026                         break;
10027                 case NFT_MSG_NEWSET:
10028                         if (nft_trans_set_update(trans)) {
10029                                 nft_trans_destroy(trans);
10030                                 break;
10031                         }
10032                         nft_use_dec_restore(&trans->ctx.table->use);
10033                         if (nft_trans_set_bound(trans)) {
10034                                 nft_trans_destroy(trans);
10035                                 break;
10036                         }
10037                         list_del_rcu(&nft_trans_set(trans)->list);
10038                         break;
10039                 case NFT_MSG_DELSET:
10040                 case NFT_MSG_DESTROYSET:
10041                         nft_use_inc_restore(&trans->ctx.table->use);
10042                         nft_clear(trans->ctx.net, nft_trans_set(trans));
10043                         if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10044                                 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10045
10046                         nft_trans_destroy(trans);
10047                         break;
10048                 case NFT_MSG_NEWSETELEM:
10049                         if (nft_trans_elem_set_bound(trans)) {
10050                                 nft_trans_destroy(trans);
10051                                 break;
10052                         }
10053                         te = (struct nft_trans_elem *)trans->data;
10054                         nft_setelem_remove(net, te->set, &te->elem);
10055                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10056                                 atomic_dec(&te->set->nelems);
10057
10058                         if (te->set->ops->abort &&
10059                             list_empty(&te->set->pending_update)) {
10060                                 list_add_tail(&te->set->pending_update,
10061                                               &set_update_list);
10062                         }
10063                         break;
10064                 case NFT_MSG_DELSETELEM:
10065                 case NFT_MSG_DESTROYSETELEM:
10066                         te = (struct nft_trans_elem *)trans->data;
10067
10068                         nft_setelem_data_activate(net, te->set, &te->elem);
10069                         nft_setelem_activate(net, te->set, &te->elem);
10070                         if (!nft_setelem_is_catchall(te->set, &te->elem))
10071                                 te->set->ndeact--;
10072
10073                         if (te->set->ops->abort &&
10074                             list_empty(&te->set->pending_update)) {
10075                                 list_add_tail(&te->set->pending_update,
10076                                               &set_update_list);
10077                         }
10078                         nft_trans_destroy(trans);
10079                         break;
10080                 case NFT_MSG_NEWOBJ:
10081                         if (nft_trans_obj_update(trans)) {
10082                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10083                                 nft_trans_destroy(trans);
10084                         } else {
10085                                 nft_use_dec_restore(&trans->ctx.table->use);
10086                                 nft_obj_del(nft_trans_obj(trans));
10087                         }
10088                         break;
10089                 case NFT_MSG_DELOBJ:
10090                 case NFT_MSG_DESTROYOBJ:
10091                         nft_use_inc_restore(&trans->ctx.table->use);
10092                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
10093                         nft_trans_destroy(trans);
10094                         break;
10095                 case NFT_MSG_NEWFLOWTABLE:
10096                         if (nft_trans_flowtable_update(trans)) {
10097                                 nft_unregister_flowtable_net_hooks(net,
10098                                                 &nft_trans_flowtable_hooks(trans));
10099                         } else {
10100                                 nft_use_dec_restore(&trans->ctx.table->use);
10101                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
10102                                 nft_unregister_flowtable_net_hooks(net,
10103                                                 &nft_trans_flowtable(trans)->hook_list);
10104                         }
10105                         break;
10106                 case NFT_MSG_DELFLOWTABLE:
10107                 case NFT_MSG_DESTROYFLOWTABLE:
10108                         if (nft_trans_flowtable_update(trans)) {
10109                                 list_splice(&nft_trans_flowtable_hooks(trans),
10110                                             &nft_trans_flowtable(trans)->hook_list);
10111                         } else {
10112                                 nft_use_inc_restore(&trans->ctx.table->use);
10113                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10114                         }
10115                         nft_trans_destroy(trans);
10116                         break;
10117                 }
10118         }
10119
10120         nft_set_abort_update(&set_update_list);
10121
10122         synchronize_rcu();
10123
10124         list_for_each_entry_safe_reverse(trans, next,
10125                                          &nft_net->commit_list, list) {
10126                 nft_trans_list_del(trans);
10127                 nf_tables_abort_release(trans);
10128         }
10129
10130         if (action == NFNL_ABORT_AUTOLOAD)
10131                 nf_tables_module_autoload(net);
10132         else
10133                 nf_tables_module_autoload_cleanup(net);
10134
10135         return 0;
10136 }
10137
10138 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10139                            enum nfnl_abort_action action)
10140 {
10141         struct nftables_pernet *nft_net = nft_pernet(net);
10142         int ret = __nf_tables_abort(net, action);
10143
10144         mutex_unlock(&nft_net->commit_mutex);
10145
10146         return ret;
10147 }
10148
10149 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10150 {
10151         struct nftables_pernet *nft_net = nft_pernet(net);
10152         bool genid_ok;
10153
10154         mutex_lock(&nft_net->commit_mutex);
10155
10156         genid_ok = genid == 0 || nft_net->base_seq == genid;
10157         if (!genid_ok)
10158                 mutex_unlock(&nft_net->commit_mutex);
10159
10160         /* else, commit mutex has to be released by commit or abort function */
10161         return genid_ok;
10162 }
10163
10164 static const struct nfnetlink_subsystem nf_tables_subsys = {
10165         .name           = "nf_tables",
10166         .subsys_id      = NFNL_SUBSYS_NFTABLES,
10167         .cb_count       = NFT_MSG_MAX,
10168         .cb             = nf_tables_cb,
10169         .commit         = nf_tables_commit,
10170         .abort          = nf_tables_abort,
10171         .valid_genid    = nf_tables_valid_genid,
10172         .owner          = THIS_MODULE,
10173 };
10174
10175 int nft_chain_validate_dependency(const struct nft_chain *chain,
10176                                   enum nft_chain_types type)
10177 {
10178         const struct nft_base_chain *basechain;
10179
10180         if (nft_is_base_chain(chain)) {
10181                 basechain = nft_base_chain(chain);
10182                 if (basechain->type->type != type)
10183                         return -EOPNOTSUPP;
10184         }
10185         return 0;
10186 }
10187 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10188
10189 int nft_chain_validate_hooks(const struct nft_chain *chain,
10190                              unsigned int hook_flags)
10191 {
10192         struct nft_base_chain *basechain;
10193
10194         if (nft_is_base_chain(chain)) {
10195                 basechain = nft_base_chain(chain);
10196
10197                 if ((1 << basechain->ops.hooknum) & hook_flags)
10198                         return 0;
10199
10200                 return -EOPNOTSUPP;
10201         }
10202
10203         return 0;
10204 }
10205 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10206
10207 /*
10208  * Loop detection - walk through the ruleset beginning at the destination chain
10209  * of a new jump until either the source chain is reached (loop) or all
10210  * reachable chains have been traversed.
10211  *
10212  * The loop check is performed whenever a new jump verdict is added to an
10213  * expression or verdict map or a verdict map is bound to a new chain.
10214  */
10215
10216 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10217                                  const struct nft_chain *chain);
10218
10219 static int nft_check_loops(const struct nft_ctx *ctx,
10220                            const struct nft_set_ext *ext)
10221 {
10222         const struct nft_data *data;
10223         int ret;
10224
10225         data = nft_set_ext_data(ext);
10226         switch (data->verdict.code) {
10227         case NFT_JUMP:
10228         case NFT_GOTO:
10229                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10230                 break;
10231         default:
10232                 ret = 0;
10233                 break;
10234         }
10235
10236         return ret;
10237 }
10238
10239 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10240                                         struct nft_set *set,
10241                                         const struct nft_set_iter *iter,
10242                                         struct nft_set_elem *elem)
10243 {
10244         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10245
10246         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10247             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10248                 return 0;
10249
10250         return nft_check_loops(ctx, ext);
10251 }
10252
10253 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10254                                   struct nft_set *set)
10255 {
10256         u8 genmask = nft_genmask_next(ctx->net);
10257         struct nft_set_elem_catchall *catchall;
10258         struct nft_set_ext *ext;
10259         int ret = 0;
10260
10261         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10262                 ext = nft_set_elem_ext(set, catchall->elem);
10263                 if (!nft_set_elem_active(ext, genmask))
10264                         continue;
10265
10266                 ret = nft_check_loops(ctx, ext);
10267                 if (ret < 0)
10268                         return ret;
10269         }
10270
10271         return ret;
10272 }
10273
10274 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10275                                  const struct nft_chain *chain)
10276 {
10277         const struct nft_rule *rule;
10278         const struct nft_expr *expr, *last;
10279         struct nft_set *set;
10280         struct nft_set_binding *binding;
10281         struct nft_set_iter iter;
10282
10283         if (ctx->chain == chain)
10284                 return -ELOOP;
10285
10286         list_for_each_entry(rule, &chain->rules, list) {
10287                 nft_rule_for_each_expr(expr, last, rule) {
10288                         struct nft_immediate_expr *priv;
10289                         const struct nft_data *data;
10290                         int err;
10291
10292                         if (strcmp(expr->ops->type->name, "immediate"))
10293                                 continue;
10294
10295                         priv = nft_expr_priv(expr);
10296                         if (priv->dreg != NFT_REG_VERDICT)
10297                                 continue;
10298
10299                         data = &priv->data;
10300                         switch (data->verdict.code) {
10301                         case NFT_JUMP:
10302                         case NFT_GOTO:
10303                                 err = nf_tables_check_loops(ctx,
10304                                                         data->verdict.chain);
10305                                 if (err < 0)
10306                                         return err;
10307                                 break;
10308                         default:
10309                                 break;
10310                         }
10311                 }
10312         }
10313
10314         list_for_each_entry(set, &ctx->table->sets, list) {
10315                 if (!nft_is_active_next(ctx->net, set))
10316                         continue;
10317                 if (!(set->flags & NFT_SET_MAP) ||
10318                     set->dtype != NFT_DATA_VERDICT)
10319                         continue;
10320
10321                 list_for_each_entry(binding, &set->bindings, list) {
10322                         if (!(binding->flags & NFT_SET_MAP) ||
10323                             binding->chain != chain)
10324                                 continue;
10325
10326                         iter.genmask    = nft_genmask_next(ctx->net);
10327                         iter.skip       = 0;
10328                         iter.count      = 0;
10329                         iter.err        = 0;
10330                         iter.fn         = nf_tables_loop_check_setelem;
10331
10332                         set->ops->walk(ctx, set, &iter);
10333                         if (!iter.err)
10334                                 iter.err = nft_set_catchall_loops(ctx, set);
10335
10336                         if (iter.err < 0)
10337                                 return iter.err;
10338                 }
10339         }
10340
10341         return 0;
10342 }
10343
10344 /**
10345  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
10346  *
10347  *      @attr: netlink attribute to fetch value from
10348  *      @max: maximum value to be stored in dest
10349  *      @dest: pointer to the variable
10350  *
10351  *      Parse, check and store a given u32 netlink attribute into variable.
10352  *      This function returns -ERANGE if the value goes over maximum value.
10353  *      Otherwise a 0 is returned and the attribute value is stored in the
10354  *      destination variable.
10355  */
10356 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10357 {
10358         u32 val;
10359
10360         val = ntohl(nla_get_be32(attr));
10361         if (val > max)
10362                 return -ERANGE;
10363
10364         *dest = val;
10365         return 0;
10366 }
10367 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10368
10369 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10370 {
10371         unsigned int reg;
10372
10373         reg = ntohl(nla_get_be32(attr));
10374         switch (reg) {
10375         case NFT_REG_VERDICT...NFT_REG_4:
10376                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10377                 break;
10378         case NFT_REG32_00...NFT_REG32_15:
10379                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10380                 break;
10381         default:
10382                 return -ERANGE;
10383         }
10384
10385         return 0;
10386 }
10387
10388 /**
10389  *      nft_dump_register - dump a register value to a netlink attribute
10390  *
10391  *      @skb: socket buffer
10392  *      @attr: attribute number
10393  *      @reg: register number
10394  *
10395  *      Construct a netlink attribute containing the register number. For
10396  *      compatibility reasons, register numbers being a multiple of 4 are
10397  *      translated to the corresponding 128 bit register numbers.
10398  */
10399 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10400 {
10401         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10402                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10403         else
10404                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10405
10406         return nla_put_be32(skb, attr, htonl(reg));
10407 }
10408 EXPORT_SYMBOL_GPL(nft_dump_register);
10409
10410 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10411 {
10412         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10413                 return -EINVAL;
10414         if (len == 0)
10415                 return -EINVAL;
10416         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10417                 return -ERANGE;
10418
10419         return 0;
10420 }
10421
10422 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10423 {
10424         u32 reg;
10425         int err;
10426
10427         err = nft_parse_register(attr, &reg);
10428         if (err < 0)
10429                 return err;
10430
10431         err = nft_validate_register_load(reg, len);
10432         if (err < 0)
10433                 return err;
10434
10435         *sreg = reg;
10436         return 0;
10437 }
10438 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10439
10440 static int nft_validate_register_store(const struct nft_ctx *ctx,
10441                                        enum nft_registers reg,
10442                                        const struct nft_data *data,
10443                                        enum nft_data_types type,
10444                                        unsigned int len)
10445 {
10446         int err;
10447
10448         switch (reg) {
10449         case NFT_REG_VERDICT:
10450                 if (type != NFT_DATA_VERDICT)
10451                         return -EINVAL;
10452
10453                 if (data != NULL &&
10454                     (data->verdict.code == NFT_GOTO ||
10455                      data->verdict.code == NFT_JUMP)) {
10456                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10457                         if (err < 0)
10458                                 return err;
10459                 }
10460
10461                 return 0;
10462         default:
10463                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10464                         return -EINVAL;
10465                 if (len == 0)
10466                         return -EINVAL;
10467                 if (reg * NFT_REG32_SIZE + len >
10468                     sizeof_field(struct nft_regs, data))
10469                         return -ERANGE;
10470
10471                 if (data != NULL && type != NFT_DATA_VALUE)
10472                         return -EINVAL;
10473                 return 0;
10474         }
10475 }
10476
10477 int nft_parse_register_store(const struct nft_ctx *ctx,
10478                              const struct nlattr *attr, u8 *dreg,
10479                              const struct nft_data *data,
10480                              enum nft_data_types type, unsigned int len)
10481 {
10482         int err;
10483         u32 reg;
10484
10485         err = nft_parse_register(attr, &reg);
10486         if (err < 0)
10487                 return err;
10488
10489         err = nft_validate_register_store(ctx, reg, data, type, len);
10490         if (err < 0)
10491                 return err;
10492
10493         *dreg = reg;
10494         return 0;
10495 }
10496 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10497
10498 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10499         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10500         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10501                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10502         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10503 };
10504
10505 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10506                             struct nft_data_desc *desc, const struct nlattr *nla)
10507 {
10508         u8 genmask = nft_genmask_next(ctx->net);
10509         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10510         struct nft_chain *chain;
10511         int err;
10512
10513         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10514                                           nft_verdict_policy, NULL);
10515         if (err < 0)
10516                 return err;
10517
10518         if (!tb[NFTA_VERDICT_CODE])
10519                 return -EINVAL;
10520
10521         /* zero padding hole for memcmp */
10522         memset(data, 0, sizeof(*data));
10523         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10524
10525         switch (data->verdict.code) {
10526         default:
10527                 switch (data->verdict.code & NF_VERDICT_MASK) {
10528                 case NF_ACCEPT:
10529                 case NF_DROP:
10530                 case NF_QUEUE:
10531                         break;
10532                 default:
10533                         return -EINVAL;
10534                 }
10535                 fallthrough;
10536         case NFT_CONTINUE:
10537         case NFT_BREAK:
10538         case NFT_RETURN:
10539                 break;
10540         case NFT_JUMP:
10541         case NFT_GOTO:
10542                 if (tb[NFTA_VERDICT_CHAIN]) {
10543                         chain = nft_chain_lookup(ctx->net, ctx->table,
10544                                                  tb[NFTA_VERDICT_CHAIN],
10545                                                  genmask);
10546                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10547                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10548                                                       tb[NFTA_VERDICT_CHAIN_ID],
10549                                                       genmask);
10550                         if (IS_ERR(chain))
10551                                 return PTR_ERR(chain);
10552                 } else {
10553                         return -EINVAL;
10554                 }
10555
10556                 if (IS_ERR(chain))
10557                         return PTR_ERR(chain);
10558                 if (nft_is_base_chain(chain))
10559                         return -EOPNOTSUPP;
10560                 if (nft_chain_is_bound(chain))
10561                         return -EINVAL;
10562                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10563                     chain->flags & NFT_CHAIN_BINDING)
10564                         return -EINVAL;
10565                 if (!nft_use_inc(&chain->use))
10566                         return -EMFILE;
10567
10568                 data->verdict.chain = chain;
10569                 break;
10570         }
10571
10572         desc->len = sizeof(data->verdict);
10573
10574         return 0;
10575 }
10576
10577 static void nft_verdict_uninit(const struct nft_data *data)
10578 {
10579         struct nft_chain *chain;
10580
10581         switch (data->verdict.code) {
10582         case NFT_JUMP:
10583         case NFT_GOTO:
10584                 chain = data->verdict.chain;
10585                 nft_use_dec(&chain->use);
10586                 break;
10587         }
10588 }
10589
10590 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10591 {
10592         struct nlattr *nest;
10593
10594         nest = nla_nest_start_noflag(skb, type);
10595         if (!nest)
10596                 goto nla_put_failure;
10597
10598         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10599                 goto nla_put_failure;
10600
10601         switch (v->code) {
10602         case NFT_JUMP:
10603         case NFT_GOTO:
10604                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10605                                    v->chain->name))
10606                         goto nla_put_failure;
10607         }
10608         nla_nest_end(skb, nest);
10609         return 0;
10610
10611 nla_put_failure:
10612         return -1;
10613 }
10614
10615 static int nft_value_init(const struct nft_ctx *ctx,
10616                           struct nft_data *data, struct nft_data_desc *desc,
10617                           const struct nlattr *nla)
10618 {
10619         unsigned int len;
10620
10621         len = nla_len(nla);
10622         if (len == 0)
10623                 return -EINVAL;
10624         if (len > desc->size)
10625                 return -EOVERFLOW;
10626         if (desc->len) {
10627                 if (len != desc->len)
10628                         return -EINVAL;
10629         } else {
10630                 desc->len = len;
10631         }
10632
10633         nla_memcpy(data->data, nla, len);
10634
10635         return 0;
10636 }
10637
10638 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10639                           unsigned int len)
10640 {
10641         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10642 }
10643
10644 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10645         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10646         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10647 };
10648
10649 /**
10650  *      nft_data_init - parse nf_tables data netlink attributes
10651  *
10652  *      @ctx: context of the expression using the data
10653  *      @data: destination struct nft_data
10654  *      @desc: data description
10655  *      @nla: netlink attribute containing data
10656  *
10657  *      Parse the netlink data attributes and initialize a struct nft_data.
10658  *      The type and length of data are returned in the data description.
10659  *
10660  *      The caller can indicate that it only wants to accept data of type
10661  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10662  */
10663 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10664                   struct nft_data_desc *desc, const struct nlattr *nla)
10665 {
10666         struct nlattr *tb[NFTA_DATA_MAX + 1];
10667         int err;
10668
10669         if (WARN_ON_ONCE(!desc->size))
10670                 return -EINVAL;
10671
10672         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10673                                           nft_data_policy, NULL);
10674         if (err < 0)
10675                 return err;
10676
10677         if (tb[NFTA_DATA_VALUE]) {
10678                 if (desc->type != NFT_DATA_VALUE)
10679                         return -EINVAL;
10680
10681                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10682         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10683                 if (desc->type != NFT_DATA_VERDICT)
10684                         return -EINVAL;
10685
10686                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10687         } else {
10688                 err = -EINVAL;
10689         }
10690
10691         return err;
10692 }
10693 EXPORT_SYMBOL_GPL(nft_data_init);
10694
10695 /**
10696  *      nft_data_release - release a nft_data item
10697  *
10698  *      @data: struct nft_data to release
10699  *      @type: type of data
10700  *
10701  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10702  *      all others need to be released by calling this function.
10703  */
10704 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10705 {
10706         if (type < NFT_DATA_VERDICT)
10707                 return;
10708         switch (type) {
10709         case NFT_DATA_VERDICT:
10710                 return nft_verdict_uninit(data);
10711         default:
10712                 WARN_ON(1);
10713         }
10714 }
10715 EXPORT_SYMBOL_GPL(nft_data_release);
10716
10717 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10718                   enum nft_data_types type, unsigned int len)
10719 {
10720         struct nlattr *nest;
10721         int err;
10722
10723         nest = nla_nest_start_noflag(skb, attr);
10724         if (nest == NULL)
10725                 return -1;
10726
10727         switch (type) {
10728         case NFT_DATA_VALUE:
10729                 err = nft_value_dump(skb, data, len);
10730                 break;
10731         case NFT_DATA_VERDICT:
10732                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10733                 break;
10734         default:
10735                 err = -EINVAL;
10736                 WARN_ON(1);
10737         }
10738
10739         nla_nest_end(skb, nest);
10740         return err;
10741 }
10742 EXPORT_SYMBOL_GPL(nft_data_dump);
10743
10744 int __nft_release_basechain(struct nft_ctx *ctx)
10745 {
10746         struct nft_rule *rule, *nr;
10747
10748         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10749                 return 0;
10750
10751         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10752         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10753                 list_del(&rule->list);
10754                 nft_use_dec(&ctx->chain->use);
10755                 nf_tables_rule_release(ctx, rule);
10756         }
10757         nft_chain_del(ctx->chain);
10758         nft_use_dec(&ctx->table->use);
10759         nf_tables_chain_destroy(ctx);
10760
10761         return 0;
10762 }
10763 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10764
10765 static void __nft_release_hook(struct net *net, struct nft_table *table)
10766 {
10767         struct nft_flowtable *flowtable;
10768         struct nft_chain *chain;
10769
10770         list_for_each_entry(chain, &table->chains, list)
10771                 __nf_tables_unregister_hook(net, table, chain, true);
10772         list_for_each_entry(flowtable, &table->flowtables, list)
10773                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10774                                                      true);
10775 }
10776
10777 static void __nft_release_hooks(struct net *net)
10778 {
10779         struct nftables_pernet *nft_net = nft_pernet(net);
10780         struct nft_table *table;
10781
10782         list_for_each_entry(table, &nft_net->tables, list) {
10783                 if (nft_table_has_owner(table))
10784                         continue;
10785
10786                 __nft_release_hook(net, table);
10787         }
10788 }
10789
10790 static void __nft_release_table(struct net *net, struct nft_table *table)
10791 {
10792         struct nft_flowtable *flowtable, *nf;
10793         struct nft_chain *chain, *nc;
10794         struct nft_object *obj, *ne;
10795         struct nft_rule *rule, *nr;
10796         struct nft_set *set, *ns;
10797         struct nft_ctx ctx = {
10798                 .net    = net,
10799                 .family = NFPROTO_NETDEV,
10800         };
10801
10802         ctx.family = table->family;
10803         ctx.table = table;
10804         list_for_each_entry(chain, &table->chains, list) {
10805                 ctx.chain = chain;
10806                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10807                         list_del(&rule->list);
10808                         nft_use_dec(&chain->use);
10809                         nf_tables_rule_release(&ctx, rule);
10810                 }
10811         }
10812         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10813                 list_del(&flowtable->list);
10814                 nft_use_dec(&table->use);
10815                 nf_tables_flowtable_destroy(flowtable);
10816         }
10817         list_for_each_entry_safe(set, ns, &table->sets, list) {
10818                 list_del(&set->list);
10819                 nft_use_dec(&table->use);
10820                 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10821                         nft_map_deactivate(&ctx, set);
10822
10823                 nft_set_destroy(&ctx, set);
10824         }
10825         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10826                 nft_obj_del(obj);
10827                 nft_use_dec(&table->use);
10828                 nft_obj_destroy(&ctx, obj);
10829         }
10830         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10831                 ctx.chain = chain;
10832                 nft_chain_del(chain);
10833                 nft_use_dec(&table->use);
10834                 nf_tables_chain_destroy(&ctx);
10835         }
10836         nf_tables_table_destroy(&ctx);
10837 }
10838
10839 static void __nft_release_tables(struct net *net)
10840 {
10841         struct nftables_pernet *nft_net = nft_pernet(net);
10842         struct nft_table *table, *nt;
10843
10844         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10845                 if (nft_table_has_owner(table))
10846                         continue;
10847
10848                 list_del(&table->list);
10849
10850                 __nft_release_table(net, table);
10851         }
10852 }
10853
10854 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10855                             void *ptr)
10856 {
10857         struct nft_table *table, *to_delete[8];
10858         struct nftables_pernet *nft_net;
10859         struct netlink_notify *n = ptr;
10860         struct net *net = n->net;
10861         unsigned int deleted;
10862         bool restart = false;
10863
10864         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10865                 return NOTIFY_DONE;
10866
10867         nft_net = nft_pernet(net);
10868         deleted = 0;
10869         mutex_lock(&nft_net->commit_mutex);
10870         if (!list_empty(&nf_tables_destroy_list))
10871                 rcu_barrier();
10872 again:
10873         list_for_each_entry(table, &nft_net->tables, list) {
10874                 if (nft_table_has_owner(table) &&
10875                     n->portid == table->nlpid) {
10876                         __nft_release_hook(net, table);
10877                         list_del_rcu(&table->list);
10878                         to_delete[deleted++] = table;
10879                         if (deleted >= ARRAY_SIZE(to_delete))
10880                                 break;
10881                 }
10882         }
10883         if (deleted) {
10884                 restart = deleted >= ARRAY_SIZE(to_delete);
10885                 synchronize_rcu();
10886                 while (deleted)
10887                         __nft_release_table(net, to_delete[--deleted]);
10888
10889                 if (restart)
10890                         goto again;
10891         }
10892         mutex_unlock(&nft_net->commit_mutex);
10893
10894         return NOTIFY_DONE;
10895 }
10896
10897 static struct notifier_block nft_nl_notifier = {
10898         .notifier_call  = nft_rcv_nl_event,
10899 };
10900
10901 static int __net_init nf_tables_init_net(struct net *net)
10902 {
10903         struct nftables_pernet *nft_net = nft_pernet(net);
10904
10905         INIT_LIST_HEAD(&nft_net->tables);
10906         INIT_LIST_HEAD(&nft_net->commit_list);
10907         INIT_LIST_HEAD(&nft_net->binding_list);
10908         INIT_LIST_HEAD(&nft_net->module_list);
10909         INIT_LIST_HEAD(&nft_net->notify_list);
10910         mutex_init(&nft_net->commit_mutex);
10911         nft_net->base_seq = 1;
10912
10913         return 0;
10914 }
10915
10916 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10917 {
10918         struct nftables_pernet *nft_net = nft_pernet(net);
10919
10920         mutex_lock(&nft_net->commit_mutex);
10921         __nft_release_hooks(net);
10922         mutex_unlock(&nft_net->commit_mutex);
10923 }
10924
10925 static void __net_exit nf_tables_exit_net(struct net *net)
10926 {
10927         struct nftables_pernet *nft_net = nft_pernet(net);
10928
10929         mutex_lock(&nft_net->commit_mutex);
10930         if (!list_empty(&nft_net->commit_list) ||
10931             !list_empty(&nft_net->module_list))
10932                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10933         __nft_release_tables(net);
10934         mutex_unlock(&nft_net->commit_mutex);
10935         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10936         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10937         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10938 }
10939
10940 static struct pernet_operations nf_tables_net_ops = {
10941         .init           = nf_tables_init_net,
10942         .pre_exit       = nf_tables_pre_exit_net,
10943         .exit           = nf_tables_exit_net,
10944         .id             = &nf_tables_net_id,
10945         .size           = sizeof(struct nftables_pernet),
10946 };
10947
10948 static int __init nf_tables_module_init(void)
10949 {
10950         int err;
10951
10952         err = register_pernet_subsys(&nf_tables_net_ops);
10953         if (err < 0)
10954                 return err;
10955
10956         err = nft_chain_filter_init();
10957         if (err < 0)
10958                 goto err_chain_filter;
10959
10960         err = nf_tables_core_module_init();
10961         if (err < 0)
10962                 goto err_core_module;
10963
10964         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10965         if (err < 0)
10966                 goto err_netdev_notifier;
10967
10968         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10969         if (err < 0)
10970                 goto err_rht_objname;
10971
10972         err = nft_offload_init();
10973         if (err < 0)
10974                 goto err_offload;
10975
10976         err = netlink_register_notifier(&nft_nl_notifier);
10977         if (err < 0)
10978                 goto err_netlink_notifier;
10979
10980         /* must be last */
10981         err = nfnetlink_subsys_register(&nf_tables_subsys);
10982         if (err < 0)
10983                 goto err_nfnl_subsys;
10984
10985         nft_chain_route_init();
10986
10987         return err;
10988
10989 err_nfnl_subsys:
10990         netlink_unregister_notifier(&nft_nl_notifier);
10991 err_netlink_notifier:
10992         nft_offload_exit();
10993 err_offload:
10994         rhltable_destroy(&nft_objname_ht);
10995 err_rht_objname:
10996         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10997 err_netdev_notifier:
10998         nf_tables_core_module_exit();
10999 err_core_module:
11000         nft_chain_filter_fini();
11001 err_chain_filter:
11002         unregister_pernet_subsys(&nf_tables_net_ops);
11003         return err;
11004 }
11005
11006 static void __exit nf_tables_module_exit(void)
11007 {
11008         nfnetlink_subsys_unregister(&nf_tables_subsys);
11009         netlink_unregister_notifier(&nft_nl_notifier);
11010         nft_offload_exit();
11011         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11012         nft_chain_filter_fini();
11013         nft_chain_route_fini();
11014         unregister_pernet_subsys(&nf_tables_net_ops);
11015         cancel_work_sync(&trans_destroy_work);
11016         rcu_barrier();
11017         rhltable_destroy(&nft_objname_ht);
11018         nf_tables_core_module_exit();
11019 }
11020
11021 module_init(nf_tables_module_init);
11022 module_exit(nf_tables_module_exit);
11023
11024 MODULE_LICENSE("GPL");
11025 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11026 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);