net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35 static u64 table_handle;
  36
  37 enum {
  38         NFT_VALIDATE_SKIP       = 0,
  39         NFT_VALIDATE_NEED,
  40         NFT_VALIDATE_DO,
  41 };
  42
  43 static struct rhltable nft_objname_ht;
  44
  45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  48
  49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  52
  53 static const struct rhashtable_params nft_chain_ht_params = {
  54         .head_offset            = offsetof(struct nft_chain, rhlhead),
  55         .key_offset             = offsetof(struct nft_chain, name),
  56         .hashfn                 = nft_chain_hash,
  57         .obj_hashfn             = nft_chain_hash_obj,
  58         .obj_cmpfn              = nft_chain_hash_cmp,
  59         .automatic_shrinking    = true,
  60 };
  61
  62 static const struct rhashtable_params nft_objname_ht_params = {
  63         .head_offset            = offsetof(struct nft_object, rhlhead),
  64         .key_offset             = offsetof(struct nft_object, key),
  65         .hashfn                 = nft_objname_hash,
  66         .obj_hashfn             = nft_objname_hash_obj,
  67         .obj_cmpfn              = nft_objname_hash_cmp,
  68         .automatic_shrinking    = true,
  69 };
  70
  71 struct nft_audit_data {
  72         struct nft_table *table;
  73         int entries;
  74         int op;
  75         struct list_head list;
  76 };
  77
  78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  79         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  80         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  81         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  82         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  83         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  84         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  85         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  86         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  87         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  88         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  89         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  90         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  91         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  92         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  93         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  94         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  95         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  97         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  98         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  99         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
 100         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 101         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 102         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 103         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 104 };
 105
 106 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 107 {
 108         struct nftables_pernet *nft_net = nft_pernet(net);
 109
 110         switch (nft_net->validate_state) {
 111         case NFT_VALIDATE_SKIP:
 112                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 113                 break;
 114         case NFT_VALIDATE_NEED:
 115                 break;
 116         case NFT_VALIDATE_DO:
 117                 if (new_validate_state == NFT_VALIDATE_NEED)
 118                         return;
 119         }
 120
 121         nft_net->validate_state = new_validate_state;
 122 }
 123 static void nf_tables_trans_destroy_work(struct work_struct *w);
 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 125
 126 static void nft_ctx_init(struct nft_ctx *ctx,
 127                          struct net *net,
 128                          const struct sk_buff *skb,
 129                          const struct nlmsghdr *nlh,
 130                          u8 family,
 131                          struct nft_table *table,
 132                          struct nft_chain *chain,
 133                          const struct nlattr * const *nla)
 134 {
 135         ctx->net        = net;
 136         ctx->family     = family;
 137         ctx->level      = 0;
 138         ctx->table      = table;
 139         ctx->chain      = chain;
 140         ctx->nla        = nla;
 141         ctx->portid     = NETLINK_CB(skb).portid;
 142         ctx->report     = nlmsg_report(nlh);
 143         ctx->flags      = nlh->nlmsg_flags;
 144         ctx->seq        = nlh->nlmsg_seq;
 145 }
 146
 147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 148                                              int msg_type, u32 size, gfp_t gfp)
 149 {
 150         struct nft_trans *trans;
 151
 152         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 153         if (trans == NULL)
 154                 return NULL;
 155
 156         trans->msg_type = msg_type;
 157         trans->ctx      = *ctx;
 158
 159         return trans;
 160 }
 161
 162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
 163                                          int msg_type, u32 size)
 164 {
 165         return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
 166 }
 167
 168 static void nft_trans_destroy(struct nft_trans *trans)
 169 {
 170         list_del(&trans->list);
 171         kfree(trans);
 172 }
 173
 174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
 175 {
 176         struct nftables_pernet *nft_net;
 177         struct net *net = ctx->net;
 178         struct nft_trans *trans;
 179
 180         if (!nft_set_is_anonymous(set))
 181                 return;
 182
 183         nft_net = nft_pernet(net);
 184         list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
 185                 switch (trans->msg_type) {
 186                 case NFT_MSG_NEWSET:
 187                         if (nft_trans_set(trans) == set)
 188                                 nft_trans_set_bound(trans) = true;
 189                         break;
 190                 case NFT_MSG_NEWSETELEM:
 191                         if (nft_trans_elem_set(trans) == set)
 192                                 nft_trans_elem_set_bound(trans) = true;
 193                         break;
 194                 }
 195         }
 196 }
 197
 198 static int nft_netdev_register_hooks(struct net *net,
 199                                      struct list_head *hook_list)
 200 {
 201         struct nft_hook *hook;
 202         int err, j;
 203
 204         j = 0;
 205         list_for_each_entry(hook, hook_list, list) {
 206                 err = nf_register_net_hook(net, &hook->ops);
 207                 if (err < 0)
 208                         goto err_register;
 209
 210                 j++;
 211         }
 212         return 0;
 213
 214 err_register:
 215         list_for_each_entry(hook, hook_list, list) {
 216                 if (j-- <= 0)
 217                         break;
 218
 219                 nf_unregister_net_hook(net, &hook->ops);
 220         }
 221         return err;
 222 }
 223
 224 static void nft_netdev_unregister_hooks(struct net *net,
 225                                         struct list_head *hook_list,
 226                                         bool release_netdev)
 227 {
 228         struct nft_hook *hook, *next;
 229
 230         list_for_each_entry_safe(hook, next, hook_list, list) {
 231                 nf_unregister_net_hook(net, &hook->ops);
 232                 if (release_netdev) {
 233                         list_del(&hook->list);
 234                         kfree_rcu(hook, rcu);
 235                 }
 236         }
 237 }
 238
 239 static int nf_tables_register_hook(struct net *net,
 240                                    const struct nft_table *table,
 241                                    struct nft_chain *chain)
 242 {
 243         struct nft_base_chain *basechain;
 244         const struct nf_hook_ops *ops;
 245
 246         if (table->flags & NFT_TABLE_F_DORMANT ||
 247             !nft_is_base_chain(chain))
 248                 return 0;
 249
 250         basechain = nft_base_chain(chain);
 251         ops = &basechain->ops;
 252
 253         if (basechain->type->ops_register)
 254                 return basechain->type->ops_register(net, ops);
 255
 256         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 257                 return nft_netdev_register_hooks(net, &basechain->hook_list);
 258
 259         return nf_register_net_hook(net, &basechain->ops);
 260 }
 261
 262 static void __nf_tables_unregister_hook(struct net *net,
 263                                         const struct nft_table *table,
 264                                         struct nft_chain *chain,
 265                                         bool release_netdev)
 266 {
 267         struct nft_base_chain *basechain;
 268         const struct nf_hook_ops *ops;
 269
 270         if (table->flags & NFT_TABLE_F_DORMANT ||
 271             !nft_is_base_chain(chain))
 272                 return;
 273         basechain = nft_base_chain(chain);
 274         ops = &basechain->ops;
 275
 276         if (basechain->type->ops_unregister)
 277                 return basechain->type->ops_unregister(net, ops);
 278
 279         if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
 280                 nft_netdev_unregister_hooks(net, &basechain->hook_list,
 281                                             release_netdev);
 282         else
 283                 nf_unregister_net_hook(net, &basechain->ops);
 284 }
 285
 286 static void nf_tables_unregister_hook(struct net *net,
 287                                       const struct nft_table *table,
 288                                       struct nft_chain *chain)
 289 {
 290         return __nf_tables_unregister_hook(net, table, chain, false);
 291 }
 292
 293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
 294 {
 295         struct nftables_pernet *nft_net = nft_pernet(net);
 296
 297         list_add_tail(&trans->list, &nft_net->commit_list);
 298 }
 299
 300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
 301 {
 302         struct nft_trans *trans;
 303
 304         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
 305         if (trans == NULL)
 306                 return -ENOMEM;
 307
 308         if (msg_type == NFT_MSG_NEWTABLE)
 309                 nft_activate_next(ctx->net, ctx->table);
 310
 311         nft_trans_commit_list_add_tail(ctx->net, trans);
 312         return 0;
 313 }
 314
 315 static int nft_deltable(struct nft_ctx *ctx)
 316 {
 317         int err;
 318
 319         err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
 320         if (err < 0)
 321                 return err;
 322
 323         nft_deactivate_next(ctx->net, ctx->table);
 324         return err;
 325 }
 326
 327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
 328 {
 329         struct nft_trans *trans;
 330
 331         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
 332         if (trans == NULL)
 333                 return ERR_PTR(-ENOMEM);
 334
 335         if (msg_type == NFT_MSG_NEWCHAIN) {
 336                 nft_activate_next(ctx->net, ctx->chain);
 337
 338                 if (ctx->nla[NFTA_CHAIN_ID]) {
 339                         nft_trans_chain_id(trans) =
 340                                 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
 341                 }
 342         }
 343
 344         nft_trans_commit_list_add_tail(ctx->net, trans);
 345         return trans;
 346 }
 347
 348 static int nft_delchain(struct nft_ctx *ctx)
 349 {
 350         struct nft_trans *trans;
 351
 352         trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
 353         if (IS_ERR(trans))
 354                 return PTR_ERR(trans);
 355
 356         ctx->table->use--;
 357         nft_deactivate_next(ctx->net, ctx->chain);
 358
 359         return 0;
 360 }
 361
 362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
 363                                    struct nft_rule *rule)
 364 {
 365         struct nft_expr *expr;
 366
 367         expr = nft_expr_first(rule);
 368         while (nft_expr_more(rule, expr)) {
 369                 if (expr->ops->activate)
 370                         expr->ops->activate(ctx, expr);
 371
 372                 expr = nft_expr_next(expr);
 373         }
 374 }
 375
 376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
 377                                      struct nft_rule *rule,
 378                                      enum nft_trans_phase phase)
 379 {
 380         struct nft_expr *expr;
 381
 382         expr = nft_expr_first(rule);
 383         while (nft_expr_more(rule, expr)) {
 384                 if (expr->ops->deactivate)
 385                         expr->ops->deactivate(ctx, expr, phase);
 386
 387                 expr = nft_expr_next(expr);
 388         }
 389 }
 390
 391 static int
 392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
 393 {
 394         /* You cannot delete the same rule twice */
 395         if (nft_is_active_next(ctx->net, rule)) {
 396                 nft_deactivate_next(ctx->net, rule);
 397                 ctx->chain->use--;
 398                 return 0;
 399         }
 400         return -ENOENT;
 401 }
 402
 403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
 404                                             struct nft_rule *rule)
 405 {
 406         struct nft_trans *trans;
 407
 408         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
 409         if (trans == NULL)
 410                 return NULL;
 411
 412         if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
 413                 nft_trans_rule_id(trans) =
 414                         ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
 415         }
 416         nft_trans_rule(trans) = rule;
 417         nft_trans_commit_list_add_tail(ctx->net, trans);
 418
 419         return trans;
 420 }
 421
 422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
 423 {
 424         struct nft_flow_rule *flow;
 425         struct nft_trans *trans;
 426         int err;
 427
 428         trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
 429         if (trans == NULL)
 430                 return -ENOMEM;
 431
 432         if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
 433                 flow = nft_flow_rule_create(ctx->net, rule);
 434                 if (IS_ERR(flow)) {
 435                         nft_trans_destroy(trans);
 436                         return PTR_ERR(flow);
 437                 }
 438
 439                 nft_trans_flow_rule(trans) = flow;
 440         }
 441
 442         err = nf_tables_delrule_deactivate(ctx, rule);
 443         if (err < 0) {
 444                 nft_trans_destroy(trans);
 445                 return err;
 446         }
 447         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
 448
 449         return 0;
 450 }
 451
 452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
 453 {
 454         struct nft_rule *rule;
 455         int err;
 456
 457         list_for_each_entry(rule, &ctx->chain->rules, list) {
 458                 if (!nft_is_active_next(ctx->net, rule))
 459                         continue;
 460
 461                 err = nft_delrule(ctx, rule);
 462                 if (err < 0)
 463                         return err;
 464         }
 465         return 0;
 466 }
 467
 468 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
 469                              struct nft_set *set)
 470 {
 471         struct nft_trans *trans;
 472
 473         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
 474         if (trans == NULL)
 475                 return -ENOMEM;
 476
 477         if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
 478                 nft_trans_set_id(trans) =
 479                         ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
 480                 nft_activate_next(ctx->net, set);
 481         }
 482         nft_trans_set(trans) = set;
 483         nft_trans_commit_list_add_tail(ctx->net, trans);
 484
 485         return 0;
 486 }
 487
 488 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
 489 {
 490         int err;
 491
 492         err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
 493         if (err < 0)
 494                 return err;
 495
 496         nft_deactivate_next(ctx->net, set);
 497         ctx->table->use--;
 498
 499         return err;
 500 }
 501
 502 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
 503                              struct nft_object *obj)
 504 {
 505         struct nft_trans *trans;
 506
 507         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
 508         if (trans == NULL)
 509                 return -ENOMEM;
 510
 511         if (msg_type == NFT_MSG_NEWOBJ)
 512                 nft_activate_next(ctx->net, obj);
 513
 514         nft_trans_obj(trans) = obj;
 515         nft_trans_commit_list_add_tail(ctx->net, trans);
 516
 517         return 0;
 518 }
 519
 520 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
 521 {
 522         int err;
 523
 524         err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
 525         if (err < 0)
 526                 return err;
 527
 528         nft_deactivate_next(ctx->net, obj);
 529         ctx->table->use--;
 530
 531         return err;
 532 }
 533
 534 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
 535                                    struct nft_flowtable *flowtable)
 536 {
 537         struct nft_trans *trans;
 538
 539         trans = nft_trans_alloc(ctx, msg_type,
 540                                 sizeof(struct nft_trans_flowtable));
 541         if (trans == NULL)
 542                 return -ENOMEM;
 543
 544         if (msg_type == NFT_MSG_NEWFLOWTABLE)
 545                 nft_activate_next(ctx->net, flowtable);
 546
 547         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
 548         nft_trans_flowtable(trans) = flowtable;
 549         nft_trans_commit_list_add_tail(ctx->net, trans);
 550
 551         return 0;
 552 }
 553
 554 static int nft_delflowtable(struct nft_ctx *ctx,
 555                             struct nft_flowtable *flowtable)
 556 {
 557         int err;
 558
 559         err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
 560         if (err < 0)
 561                 return err;
 562
 563         nft_deactivate_next(ctx->net, flowtable);
 564         ctx->table->use--;
 565
 566         return err;
 567 }
 568
 569 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
 570 {
 571         int i;
 572
 573         for (i = track->regs[dreg].num_reg; i > 0; i--)
 574                 __nft_reg_track_cancel(track, dreg - i);
 575 }
 576
 577 static void __nft_reg_track_update(struct nft_regs_track *track,
 578                                    const struct nft_expr *expr,
 579                                    u8 dreg, u8 num_reg)
 580 {
 581         track->regs[dreg].selector = expr;
 582         track->regs[dreg].bitwise = NULL;
 583         track->regs[dreg].num_reg = num_reg;
 584 }
 585
 586 void nft_reg_track_update(struct nft_regs_track *track,
 587                           const struct nft_expr *expr, u8 dreg, u8 len)
 588 {
 589         unsigned int regcount;
 590         int i;
 591
 592         __nft_reg_track_clobber(track, dreg);
 593
 594         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 595         for (i = 0; i < regcount; i++, dreg++)
 596                 __nft_reg_track_update(track, expr, dreg, i);
 597 }
 598 EXPORT_SYMBOL_GPL(nft_reg_track_update);
 599
 600 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
 601 {
 602         unsigned int regcount;
 603         int i;
 604
 605         __nft_reg_track_clobber(track, dreg);
 606
 607         regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
 608         for (i = 0; i < regcount; i++, dreg++)
 609                 __nft_reg_track_cancel(track, dreg);
 610 }
 611 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
 612
 613 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
 614 {
 615         track->regs[dreg].selector = NULL;
 616         track->regs[dreg].bitwise = NULL;
 617         track->regs[dreg].num_reg = 0;
 618 }
 619 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
 620
 621 /*
 622  * Tables
 623  */
 624
 625 static struct nft_table *nft_table_lookup(const struct net *net,
 626                                           const struct nlattr *nla,
 627                                           u8 family, u8 genmask, u32 nlpid)
 628 {
 629         struct nftables_pernet *nft_net;
 630         struct nft_table *table;
 631
 632         if (nla == NULL)
 633                 return ERR_PTR(-EINVAL);
 634
 635         nft_net = nft_pernet(net);
 636         list_for_each_entry_rcu(table, &nft_net->tables, list,
 637                                 lockdep_is_held(&nft_net->commit_mutex)) {
 638                 if (!nla_strcmp(nla, table->name) &&
 639                     table->family == family &&
 640                     nft_active_genmask(table, genmask)) {
 641                         if (nft_table_has_owner(table) &&
 642                             nlpid && table->nlpid != nlpid)
 643                                 return ERR_PTR(-EPERM);
 644
 645                         return table;
 646                 }
 647         }
 648
 649         return ERR_PTR(-ENOENT);
 650 }
 651
 652 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
 653                                                    const struct nlattr *nla,
 654                                                    u8 genmask, u32 nlpid)
 655 {
 656         struct nftables_pernet *nft_net;
 657         struct nft_table *table;
 658
 659         nft_net = nft_pernet(net);
 660         list_for_each_entry(table, &nft_net->tables, list) {
 661                 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
 662                     nft_active_genmask(table, genmask)) {
 663                         if (nft_table_has_owner(table) &&
 664                             nlpid && table->nlpid != nlpid)
 665                                 return ERR_PTR(-EPERM);
 666
 667                         return table;
 668                 }
 669         }
 670
 671         return ERR_PTR(-ENOENT);
 672 }
 673
 674 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
 675 {
 676         return ++table->hgenerator;
 677 }
 678
 679 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
 680
 681 static const struct nft_chain_type *
 682 __nft_chain_type_get(u8 family, enum nft_chain_types type)
 683 {
 684         if (family >= NFPROTO_NUMPROTO ||
 685             type >= NFT_CHAIN_T_MAX)
 686                 return NULL;
 687
 688         return chain_type[family][type];
 689 }
 690
 691 static const struct nft_chain_type *
 692 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
 693 {
 694         const struct nft_chain_type *type;
 695         int i;
 696
 697         for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
 698                 type = __nft_chain_type_get(family, i);
 699                 if (!type)
 700                         continue;
 701                 if (!nla_strcmp(nla, type->name))
 702                         return type;
 703         }
 704         return NULL;
 705 }
 706
 707 struct nft_module_request {
 708         struct list_head        list;
 709         char                    module[MODULE_NAME_LEN];
 710         bool                    done;
 711 };
 712
 713 #ifdef CONFIG_MODULES
 714 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 715                                       ...)
 716 {
 717         char module_name[MODULE_NAME_LEN];
 718         struct nftables_pernet *nft_net;
 719         struct nft_module_request *req;
 720         va_list args;
 721         int ret;
 722
 723         va_start(args, fmt);
 724         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
 725         va_end(args);
 726         if (ret >= MODULE_NAME_LEN)
 727                 return 0;
 728
 729         nft_net = nft_pernet(net);
 730         list_for_each_entry(req, &nft_net->module_list, list) {
 731                 if (!strcmp(req->module, module_name)) {
 732                         if (req->done)
 733                                 return 0;
 734
 735                         /* A request to load this module already exists. */
 736                         return -EAGAIN;
 737                 }
 738         }
 739
 740         req = kmalloc(sizeof(*req), GFP_KERNEL);
 741         if (!req)
 742                 return -ENOMEM;
 743
 744         req->done = false;
 745         strlcpy(req->module, module_name, MODULE_NAME_LEN);
 746         list_add_tail(&req->list, &nft_net->module_list);
 747
 748         return -EAGAIN;
 749 }
 750 EXPORT_SYMBOL_GPL(nft_request_module);
 751 #endif
 752
 753 static void lockdep_nfnl_nft_mutex_not_held(void)
 754 {
 755 #ifdef CONFIG_PROVE_LOCKING
 756         if (debug_locks)
 757                 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
 758 #endif
 759 }
 760
 761 static const struct nft_chain_type *
 762 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
 763                             u8 family, bool autoload)
 764 {
 765         const struct nft_chain_type *type;
 766
 767         type = __nf_tables_chain_type_lookup(nla, family);
 768         if (type != NULL)
 769                 return type;
 770
 771         lockdep_nfnl_nft_mutex_not_held();
 772 #ifdef CONFIG_MODULES
 773         if (autoload) {
 774                 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
 775                                        nla_len(nla),
 776                                        (const char *)nla_data(nla)) == -EAGAIN)
 777                         return ERR_PTR(-EAGAIN);
 778         }
 779 #endif
 780         return ERR_PTR(-ENOENT);
 781 }
 782
 783 static __be16 nft_base_seq(const struct net *net)
 784 {
 785         struct nftables_pernet *nft_net = nft_pernet(net);
 786
 787         return htons(nft_net->base_seq & 0xffff);
 788 }
 789
 790 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
 791         [NFTA_TABLE_NAME]       = { .type = NLA_STRING,
 792                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
 793         [NFTA_TABLE_FLAGS]      = { .type = NLA_U32 },
 794         [NFTA_TABLE_HANDLE]     = { .type = NLA_U64 },
 795         [NFTA_TABLE_USERDATA]   = { .type = NLA_BINARY,
 796                                     .len = NFT_USERDATA_MAXLEN }
 797 };
 798
 799 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
 800                                      u32 portid, u32 seq, int event, u32 flags,
 801                                      int family, const struct nft_table *table)
 802 {
 803         struct nlmsghdr *nlh;
 804
 805         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
 806         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
 807                            NFNETLINK_V0, nft_base_seq(net));
 808         if (!nlh)
 809                 goto nla_put_failure;
 810
 811         if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
 812             nla_put_be32(skb, NFTA_TABLE_FLAGS,
 813                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 814             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 815             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 816                          NFTA_TABLE_PAD))
 817                 goto nla_put_failure;
 818         if (nft_table_has_owner(table) &&
 819             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 820                 goto nla_put_failure;
 821
 822         if (table->udata) {
 823                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 824                         goto nla_put_failure;
 825         }
 826
 827         nlmsg_end(skb, nlh);
 828         return 0;
 829
 830 nla_put_failure:
 831         nlmsg_trim(skb, nlh);
 832         return -1;
 833 }
 834
 835 struct nftnl_skb_parms {
 836         bool report;
 837 };
 838 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 839
 840 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 841                                struct list_head *notify_list)
 842 {
 843         NFT_CB(skb).report = report;
 844         list_add_tail(&skb->list, notify_list);
 845 }
 846
 847 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 848 {
 849         struct nftables_pernet *nft_net;
 850         struct sk_buff *skb;
 851         u16 flags = 0;
 852         int err;
 853
 854         if (!ctx->report &&
 855             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 856                 return;
 857
 858         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 859         if (skb == NULL)
 860                 goto err;
 861
 862         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 863                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 864
 865         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 866                                         event, flags, ctx->family, ctx->table);
 867         if (err < 0) {
 868                 kfree_skb(skb);
 869                 goto err;
 870         }
 871
 872         nft_net = nft_pernet(ctx->net);
 873         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 874         return;
 875 err:
 876         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 877 }
 878
 879 static int nf_tables_dump_tables(struct sk_buff *skb,
 880                                  struct netlink_callback *cb)
 881 {
 882         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 883         struct nftables_pernet *nft_net;
 884         const struct nft_table *table;
 885         unsigned int idx = 0, s_idx = cb->args[0];
 886         struct net *net = sock_net(skb->sk);
 887         int family = nfmsg->nfgen_family;
 888
 889         rcu_read_lock();
 890         nft_net = nft_pernet(net);
 891         cb->seq = nft_net->base_seq;
 892
 893         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 894                 if (family != NFPROTO_UNSPEC && family != table->family)
 895                         continue;
 896
 897                 if (idx < s_idx)
 898                         goto cont;
 899                 if (idx > s_idx)
 900                         memset(&cb->args[1], 0,
 901                                sizeof(cb->args) - sizeof(cb->args[0]));
 902                 if (!nft_is_active(net, table))
 903                         continue;
 904                 if (nf_tables_fill_table_info(skb, net,
 905                                               NETLINK_CB(cb->skb).portid,
 906                                               cb->nlh->nlmsg_seq,
 907                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 908                                               table->family, table) < 0)
 909                         goto done;
 910
 911                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 912 cont:
 913                 idx++;
 914         }
 915 done:
 916         rcu_read_unlock();
 917         cb->args[0] = idx;
 918         return skb->len;
 919 }
 920
 921 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 922                                       const struct nlmsghdr *nlh,
 923                                       struct netlink_dump_control *c)
 924 {
 925         int err;
 926
 927         if (!try_module_get(THIS_MODULE))
 928                 return -EINVAL;
 929
 930         rcu_read_unlock();
 931         err = netlink_dump_start(nlsk, skb, nlh, c);
 932         rcu_read_lock();
 933         module_put(THIS_MODULE);
 934
 935         return err;
 936 }
 937
 938 /* called with rcu_read_lock held */
 939 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 940                               const struct nlattr * const nla[])
 941 {
 942         struct netlink_ext_ack *extack = info->extack;
 943         u8 genmask = nft_genmask_cur(info->net);
 944         u8 family = info->nfmsg->nfgen_family;
 945         const struct nft_table *table;
 946         struct net *net = info->net;
 947         struct sk_buff *skb2;
 948         int err;
 949
 950         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 951                 struct netlink_dump_control c = {
 952                         .dump = nf_tables_dump_tables,
 953                         .module = THIS_MODULE,
 954                 };
 955
 956                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 957         }
 958
 959         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 960         if (IS_ERR(table)) {
 961                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 962                 return PTR_ERR(table);
 963         }
 964
 965         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 966         if (!skb2)
 967                 return -ENOMEM;
 968
 969         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 970                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 971                                         0, family, table);
 972         if (err < 0)
 973                 goto err_fill_table_info;
 974
 975         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 976
 977 err_fill_table_info:
 978         kfree_skb(skb2);
 979         return err;
 980 }
 981
 982 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 983 {
 984         struct nft_chain *chain;
 985         u32 i = 0;
 986
 987         list_for_each_entry(chain, &table->chains, list) {
 988                 if (!nft_is_active_next(net, chain))
 989                         continue;
 990                 if (!nft_is_base_chain(chain))
 991                         continue;
 992
 993                 if (cnt && i++ == cnt)
 994                         break;
 995
 996                 nf_tables_unregister_hook(net, table, chain);
 997         }
 998 }
 999
1000 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1001 {
1002         struct nft_chain *chain;
1003         int err, i = 0;
1004
1005         list_for_each_entry(chain, &table->chains, list) {
1006                 if (!nft_is_active_next(net, chain))
1007                         continue;
1008                 if (!nft_is_base_chain(chain))
1009                         continue;
1010
1011                 err = nf_tables_register_hook(net, table, chain);
1012                 if (err < 0)
1013                         goto err_register_hooks;
1014
1015                 i++;
1016         }
1017         return 0;
1018
1019 err_register_hooks:
1020         if (i)
1021                 nft_table_disable(net, table, i);
1022         return err;
1023 }
1024
1025 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1026 {
1027         table->flags &= ~NFT_TABLE_F_DORMANT;
1028         nft_table_disable(net, table, 0);
1029         table->flags |= NFT_TABLE_F_DORMANT;
1030 }
1031
1032 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1033 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1034 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1035 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1036                                          __NFT_TABLE_F_WAS_AWAKEN)
1037
1038 static int nf_tables_updtable(struct nft_ctx *ctx)
1039 {
1040         struct nft_trans *trans;
1041         u32 flags;
1042         int ret;
1043
1044         if (!ctx->nla[NFTA_TABLE_FLAGS])
1045                 return 0;
1046
1047         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1048         if (flags & ~NFT_TABLE_F_MASK)
1049                 return -EOPNOTSUPP;
1050
1051         if (flags == ctx->table->flags)
1052                 return 0;
1053
1054         if ((nft_table_has_owner(ctx->table) &&
1055              !(flags & NFT_TABLE_F_OWNER)) ||
1056             (!nft_table_has_owner(ctx->table) &&
1057              flags & NFT_TABLE_F_OWNER))
1058                 return -EOPNOTSUPP;
1059
1060         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1061                                 sizeof(struct nft_trans_table));
1062         if (trans == NULL)
1063                 return -ENOMEM;
1064
1065         if ((flags & NFT_TABLE_F_DORMANT) &&
1066             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1067                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1068                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1069                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1070         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1071                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1072                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1073                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1074                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1075                         if (ret < 0)
1076                                 goto err_register_hooks;
1077
1078                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1079                 }
1080         }
1081
1082         nft_trans_table_update(trans) = true;
1083         nft_trans_commit_list_add_tail(ctx->net, trans);
1084
1085         return 0;
1086
1087 err_register_hooks:
1088         nft_trans_destroy(trans);
1089         return ret;
1090 }
1091
1092 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1093 {
1094         const char *name = data;
1095
1096         return jhash(name, strlen(name), seed);
1097 }
1098
1099 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1100 {
1101         const struct nft_chain *chain = data;
1102
1103         return nft_chain_hash(chain->name, 0, seed);
1104 }
1105
1106 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1107                               const void *ptr)
1108 {
1109         const struct nft_chain *chain = ptr;
1110         const char *name = arg->key;
1111
1112         return strcmp(chain->name, name);
1113 }
1114
1115 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1116 {
1117         const struct nft_object_hash_key *k = data;
1118
1119         seed ^= hash_ptr(k->table, 32);
1120
1121         return jhash(k->name, strlen(k->name), seed);
1122 }
1123
1124 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1125 {
1126         const struct nft_object *obj = data;
1127
1128         return nft_objname_hash(&obj->key, 0, seed);
1129 }
1130
1131 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1132                                 const void *ptr)
1133 {
1134         const struct nft_object_hash_key *k = arg->key;
1135         const struct nft_object *obj = ptr;
1136
1137         if (obj->key.table != k->table)
1138                 return -1;
1139
1140         return strcmp(obj->key.name, k->name);
1141 }
1142
1143 static bool nft_supported_family(u8 family)
1144 {
1145         return false
1146 #ifdef CONFIG_NF_TABLES_INET
1147                 || family == NFPROTO_INET
1148 #endif
1149 #ifdef CONFIG_NF_TABLES_IPV4
1150                 || family == NFPROTO_IPV4
1151 #endif
1152 #ifdef CONFIG_NF_TABLES_ARP
1153                 || family == NFPROTO_ARP
1154 #endif
1155 #ifdef CONFIG_NF_TABLES_NETDEV
1156                 || family == NFPROTO_NETDEV
1157 #endif
1158 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1159                 || family == NFPROTO_BRIDGE
1160 #endif
1161 #ifdef CONFIG_NF_TABLES_IPV6
1162                 || family == NFPROTO_IPV6
1163 #endif
1164                 ;
1165 }
1166
1167 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1168                               const struct nlattr * const nla[])
1169 {
1170         struct nftables_pernet *nft_net = nft_pernet(info->net);
1171         struct netlink_ext_ack *extack = info->extack;
1172         u8 genmask = nft_genmask_next(info->net);
1173         u8 family = info->nfmsg->nfgen_family;
1174         struct net *net = info->net;
1175         const struct nlattr *attr;
1176         struct nft_table *table;
1177         struct nft_ctx ctx;
1178         u32 flags = 0;
1179         int err;
1180
1181         if (!nft_supported_family(family))
1182                 return -EOPNOTSUPP;
1183
1184         lockdep_assert_held(&nft_net->commit_mutex);
1185         attr = nla[NFTA_TABLE_NAME];
1186         table = nft_table_lookup(net, attr, family, genmask,
1187                                  NETLINK_CB(skb).portid);
1188         if (IS_ERR(table)) {
1189                 if (PTR_ERR(table) != -ENOENT)
1190                         return PTR_ERR(table);
1191         } else {
1192                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1193                         NL_SET_BAD_ATTR(extack, attr);
1194                         return -EEXIST;
1195                 }
1196                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1197                         return -EOPNOTSUPP;
1198
1199                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1200
1201                 return nf_tables_updtable(&ctx);
1202         }
1203
1204         if (nla[NFTA_TABLE_FLAGS]) {
1205                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1206                 if (flags & ~NFT_TABLE_F_MASK)
1207                         return -EOPNOTSUPP;
1208         }
1209
1210         err = -ENOMEM;
1211         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1212         if (table == NULL)
1213                 goto err_kzalloc;
1214
1215         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1216         if (table->name == NULL)
1217                 goto err_strdup;
1218
1219         if (nla[NFTA_TABLE_USERDATA]) {
1220                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1221                 if (table->udata == NULL)
1222                         goto err_table_udata;
1223
1224                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1225         }
1226
1227         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1228         if (err)
1229                 goto err_chain_ht;
1230
1231         INIT_LIST_HEAD(&table->chains);
1232         INIT_LIST_HEAD(&table->sets);
1233         INIT_LIST_HEAD(&table->objects);
1234         INIT_LIST_HEAD(&table->flowtables);
1235         table->family = family;
1236         table->flags = flags;
1237         table->handle = ++table_handle;
1238         if (table->flags & NFT_TABLE_F_OWNER)
1239                 table->nlpid = NETLINK_CB(skb).portid;
1240
1241         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1242         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1243         if (err < 0)
1244                 goto err_trans;
1245
1246         list_add_tail_rcu(&table->list, &nft_net->tables);
1247         return 0;
1248 err_trans:
1249         rhltable_destroy(&table->chains_ht);
1250 err_chain_ht:
1251         kfree(table->udata);
1252 err_table_udata:
1253         kfree(table->name);
1254 err_strdup:
1255         kfree(table);
1256 err_kzalloc:
1257         return err;
1258 }
1259
1260 static int nft_flush_table(struct nft_ctx *ctx)
1261 {
1262         struct nft_flowtable *flowtable, *nft;
1263         struct nft_chain *chain, *nc;
1264         struct nft_object *obj, *ne;
1265         struct nft_set *set, *ns;
1266         int err;
1267
1268         list_for_each_entry(chain, &ctx->table->chains, list) {
1269                 if (!nft_is_active_next(ctx->net, chain))
1270                         continue;
1271
1272                 if (nft_chain_is_bound(chain))
1273                         continue;
1274
1275                 ctx->chain = chain;
1276
1277                 err = nft_delrule_by_chain(ctx);
1278                 if (err < 0)
1279                         goto out;
1280         }
1281
1282         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1283                 if (!nft_is_active_next(ctx->net, set))
1284                         continue;
1285
1286                 if (nft_set_is_anonymous(set) &&
1287                     !list_empty(&set->bindings))
1288                         continue;
1289
1290                 err = nft_delset(ctx, set);
1291                 if (err < 0)
1292                         goto out;
1293         }
1294
1295         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1296                 if (!nft_is_active_next(ctx->net, flowtable))
1297                         continue;
1298
1299                 err = nft_delflowtable(ctx, flowtable);
1300                 if (err < 0)
1301                         goto out;
1302         }
1303
1304         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1305                 if (!nft_is_active_next(ctx->net, obj))
1306                         continue;
1307
1308                 err = nft_delobj(ctx, obj);
1309                 if (err < 0)
1310                         goto out;
1311         }
1312
1313         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1314                 if (!nft_is_active_next(ctx->net, chain))
1315                         continue;
1316
1317                 if (nft_chain_is_bound(chain))
1318                         continue;
1319
1320                 ctx->chain = chain;
1321
1322                 err = nft_delchain(ctx);
1323                 if (err < 0)
1324                         goto out;
1325         }
1326
1327         err = nft_deltable(ctx);
1328 out:
1329         return err;
1330 }
1331
1332 static int nft_flush(struct nft_ctx *ctx, int family)
1333 {
1334         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1335         const struct nlattr * const *nla = ctx->nla;
1336         struct nft_table *table, *nt;
1337         int err = 0;
1338
1339         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1340                 if (family != AF_UNSPEC && table->family != family)
1341                         continue;
1342
1343                 ctx->family = table->family;
1344
1345                 if (!nft_is_active_next(ctx->net, table))
1346                         continue;
1347
1348                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1349                         continue;
1350
1351                 if (nla[NFTA_TABLE_NAME] &&
1352                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1353                         continue;
1354
1355                 ctx->table = table;
1356
1357                 err = nft_flush_table(ctx);
1358                 if (err < 0)
1359                         goto out;
1360         }
1361 out:
1362         return err;
1363 }
1364
1365 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1366                               const struct nlattr * const nla[])
1367 {
1368         struct netlink_ext_ack *extack = info->extack;
1369         u8 genmask = nft_genmask_next(info->net);
1370         u8 family = info->nfmsg->nfgen_family;
1371         struct net *net = info->net;
1372         const struct nlattr *attr;
1373         struct nft_table *table;
1374         struct nft_ctx ctx;
1375
1376         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1377         if (family == AF_UNSPEC ||
1378             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1379                 return nft_flush(&ctx, family);
1380
1381         if (nla[NFTA_TABLE_HANDLE]) {
1382                 attr = nla[NFTA_TABLE_HANDLE];
1383                 table = nft_table_lookup_byhandle(net, attr, genmask,
1384                                                   NETLINK_CB(skb).portid);
1385         } else {
1386                 attr = nla[NFTA_TABLE_NAME];
1387                 table = nft_table_lookup(net, attr, family, genmask,
1388                                          NETLINK_CB(skb).portid);
1389         }
1390
1391         if (IS_ERR(table)) {
1392                 NL_SET_BAD_ATTR(extack, attr);
1393                 return PTR_ERR(table);
1394         }
1395
1396         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1397             table->use > 0)
1398                 return -EBUSY;
1399
1400         ctx.family = family;
1401         ctx.table = table;
1402
1403         return nft_flush_table(&ctx);
1404 }
1405
1406 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1407 {
1408         if (WARN_ON(ctx->table->use > 0))
1409                 return;
1410
1411         rhltable_destroy(&ctx->table->chains_ht);
1412         kfree(ctx->table->name);
1413         kfree(ctx->table->udata);
1414         kfree(ctx->table);
1415 }
1416
1417 void nft_register_chain_type(const struct nft_chain_type *ctype)
1418 {
1419         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1420         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1421                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1422                 return;
1423         }
1424         chain_type[ctype->family][ctype->type] = ctype;
1425         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1426 }
1427 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1428
1429 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1430 {
1431         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1432         chain_type[ctype->family][ctype->type] = NULL;
1433         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1434 }
1435 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1436
1437 /*
1438  * Chains
1439  */
1440
1441 static struct nft_chain *
1442 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1443 {
1444         struct nft_chain *chain;
1445
1446         list_for_each_entry(chain, &table->chains, list) {
1447                 if (chain->handle == handle &&
1448                     nft_active_genmask(chain, genmask))
1449                         return chain;
1450         }
1451
1452         return ERR_PTR(-ENOENT);
1453 }
1454
1455 static bool lockdep_commit_lock_is_held(const struct net *net)
1456 {
1457 #ifdef CONFIG_PROVE_LOCKING
1458         struct nftables_pernet *nft_net = nft_pernet(net);
1459
1460         return lockdep_is_held(&nft_net->commit_mutex);
1461 #else
1462         return true;
1463 #endif
1464 }
1465
1466 static struct nft_chain *nft_chain_lookup(struct net *net,
1467                                           struct nft_table *table,
1468                                           const struct nlattr *nla, u8 genmask)
1469 {
1470         char search[NFT_CHAIN_MAXNAMELEN + 1];
1471         struct rhlist_head *tmp, *list;
1472         struct nft_chain *chain;
1473
1474         if (nla == NULL)
1475                 return ERR_PTR(-EINVAL);
1476
1477         nla_strscpy(search, nla, sizeof(search));
1478
1479         WARN_ON(!rcu_read_lock_held() &&
1480                 !lockdep_commit_lock_is_held(net));
1481
1482         chain = ERR_PTR(-ENOENT);
1483         rcu_read_lock();
1484         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1485         if (!list)
1486                 goto out_unlock;
1487
1488         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1489                 if (nft_active_genmask(chain, genmask))
1490                         goto out_unlock;
1491         }
1492         chain = ERR_PTR(-ENOENT);
1493 out_unlock:
1494         rcu_read_unlock();
1495         return chain;
1496 }
1497
1498 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1499         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1500                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1501         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1502         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1503                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1504         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1505         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1506         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1507                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1508         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1509         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1510         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1511         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1512                                     .len = NFT_USERDATA_MAXLEN },
1513 };
1514
1515 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1516         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1517         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1518         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1519                                     .len = IFNAMSIZ - 1 },
1520 };
1521
1522 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1523 {
1524         struct nft_stats *cpu_stats, total;
1525         struct nlattr *nest;
1526         unsigned int seq;
1527         u64 pkts, bytes;
1528         int cpu;
1529
1530         if (!stats)
1531                 return 0;
1532
1533         memset(&total, 0, sizeof(total));
1534         for_each_possible_cpu(cpu) {
1535                 cpu_stats = per_cpu_ptr(stats, cpu);
1536                 do {
1537                         seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1538                         pkts = cpu_stats->pkts;
1539                         bytes = cpu_stats->bytes;
1540                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1541                 total.pkts += pkts;
1542                 total.bytes += bytes;
1543         }
1544         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1545         if (nest == NULL)
1546                 goto nla_put_failure;
1547
1548         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1549                          NFTA_COUNTER_PAD) ||
1550             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1551                          NFTA_COUNTER_PAD))
1552                 goto nla_put_failure;
1553
1554         nla_nest_end(skb, nest);
1555         return 0;
1556
1557 nla_put_failure:
1558         return -ENOSPC;
1559 }
1560
1561 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1562                                    const struct nft_base_chain *basechain)
1563 {
1564         const struct nf_hook_ops *ops = &basechain->ops;
1565         struct nft_hook *hook, *first = NULL;
1566         struct nlattr *nest, *nest_devs;
1567         int n = 0;
1568
1569         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1570         if (nest == NULL)
1571                 goto nla_put_failure;
1572         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1573                 goto nla_put_failure;
1574         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1575                 goto nla_put_failure;
1576
1577         if (nft_base_chain_netdev(family, ops->hooknum)) {
1578                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1579                 list_for_each_entry(hook, &basechain->hook_list, list) {
1580                         if (!first)
1581                                 first = hook;
1582
1583                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1584                                            hook->ops.dev->name))
1585                                 goto nla_put_failure;
1586                         n++;
1587                 }
1588                 nla_nest_end(skb, nest_devs);
1589
1590                 if (n == 1 &&
1591                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1592                         goto nla_put_failure;
1593         }
1594         nla_nest_end(skb, nest);
1595
1596         return 0;
1597 nla_put_failure:
1598         return -1;
1599 }
1600
1601 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1602                                      u32 portid, u32 seq, int event, u32 flags,
1603                                      int family, const struct nft_table *table,
1604                                      const struct nft_chain *chain)
1605 {
1606         struct nlmsghdr *nlh;
1607
1608         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1609         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1610                            NFNETLINK_V0, nft_base_seq(net));
1611         if (!nlh)
1612                 goto nla_put_failure;
1613
1614         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1615                 goto nla_put_failure;
1616         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1617                          NFTA_CHAIN_PAD))
1618                 goto nla_put_failure;
1619         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1620                 goto nla_put_failure;
1621
1622         if (nft_is_base_chain(chain)) {
1623                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1624                 struct nft_stats __percpu *stats;
1625
1626                 if (nft_dump_basechain_hook(skb, family, basechain))
1627                         goto nla_put_failure;
1628
1629                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1630                                  htonl(basechain->policy)))
1631                         goto nla_put_failure;
1632
1633                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1634                         goto nla_put_failure;
1635
1636                 stats = rcu_dereference_check(basechain->stats,
1637                                               lockdep_commit_lock_is_held(net));
1638                 if (nft_dump_stats(skb, stats))
1639                         goto nla_put_failure;
1640         }
1641
1642         if (chain->flags &&
1643             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1644                 goto nla_put_failure;
1645
1646         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1647                 goto nla_put_failure;
1648
1649         if (chain->udata &&
1650             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1651                 goto nla_put_failure;
1652
1653         nlmsg_end(skb, nlh);
1654         return 0;
1655
1656 nla_put_failure:
1657         nlmsg_trim(skb, nlh);
1658         return -1;
1659 }
1660
1661 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1662 {
1663         struct nftables_pernet *nft_net;
1664         struct sk_buff *skb;
1665         u16 flags = 0;
1666         int err;
1667
1668         if (!ctx->report &&
1669             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1670                 return;
1671
1672         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1673         if (skb == NULL)
1674                 goto err;
1675
1676         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1677                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1678
1679         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1680                                         event, flags, ctx->family, ctx->table,
1681                                         ctx->chain);
1682         if (err < 0) {
1683                 kfree_skb(skb);
1684                 goto err;
1685         }
1686
1687         nft_net = nft_pernet(ctx->net);
1688         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1689         return;
1690 err:
1691         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1692 }
1693
1694 static int nf_tables_dump_chains(struct sk_buff *skb,
1695                                  struct netlink_callback *cb)
1696 {
1697         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1698         unsigned int idx = 0, s_idx = cb->args[0];
1699         struct net *net = sock_net(skb->sk);
1700         int family = nfmsg->nfgen_family;
1701         struct nftables_pernet *nft_net;
1702         const struct nft_table *table;
1703         const struct nft_chain *chain;
1704
1705         rcu_read_lock();
1706         nft_net = nft_pernet(net);
1707         cb->seq = nft_net->base_seq;
1708
1709         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1710                 if (family != NFPROTO_UNSPEC && family != table->family)
1711                         continue;
1712
1713                 list_for_each_entry_rcu(chain, &table->chains, list) {
1714                         if (idx < s_idx)
1715                                 goto cont;
1716                         if (idx > s_idx)
1717                                 memset(&cb->args[1], 0,
1718                                        sizeof(cb->args) - sizeof(cb->args[0]));
1719                         if (!nft_is_active(net, chain))
1720                                 continue;
1721                         if (nf_tables_fill_chain_info(skb, net,
1722                                                       NETLINK_CB(cb->skb).portid,
1723                                                       cb->nlh->nlmsg_seq,
1724                                                       NFT_MSG_NEWCHAIN,
1725                                                       NLM_F_MULTI,
1726                                                       table->family, table,
1727                                                       chain) < 0)
1728                                 goto done;
1729
1730                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1731 cont:
1732                         idx++;
1733                 }
1734         }
1735 done:
1736         rcu_read_unlock();
1737         cb->args[0] = idx;
1738         return skb->len;
1739 }
1740
1741 /* called with rcu_read_lock held */
1742 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1743                               const struct nlattr * const nla[])
1744 {
1745         struct netlink_ext_ack *extack = info->extack;
1746         u8 genmask = nft_genmask_cur(info->net);
1747         u8 family = info->nfmsg->nfgen_family;
1748         const struct nft_chain *chain;
1749         struct net *net = info->net;
1750         struct nft_table *table;
1751         struct sk_buff *skb2;
1752         int err;
1753
1754         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1755                 struct netlink_dump_control c = {
1756                         .dump = nf_tables_dump_chains,
1757                         .module = THIS_MODULE,
1758                 };
1759
1760                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1761         }
1762
1763         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1764         if (IS_ERR(table)) {
1765                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1766                 return PTR_ERR(table);
1767         }
1768
1769         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1770         if (IS_ERR(chain)) {
1771                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1772                 return PTR_ERR(chain);
1773         }
1774
1775         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1776         if (!skb2)
1777                 return -ENOMEM;
1778
1779         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1780                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1781                                         0, family, table, chain);
1782         if (err < 0)
1783                 goto err_fill_chain_info;
1784
1785         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1786
1787 err_fill_chain_info:
1788         kfree_skb(skb2);
1789         return err;
1790 }
1791
1792 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1793         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1794         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1795 };
1796
1797 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1798 {
1799         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1800         struct nft_stats __percpu *newstats;
1801         struct nft_stats *stats;
1802         int err;
1803
1804         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1805                                           nft_counter_policy, NULL);
1806         if (err < 0)
1807                 return ERR_PTR(err);
1808
1809         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1810                 return ERR_PTR(-EINVAL);
1811
1812         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1813         if (newstats == NULL)
1814                 return ERR_PTR(-ENOMEM);
1815
1816         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1817          * are not exposed to userspace.
1818          */
1819         preempt_disable();
1820         stats = this_cpu_ptr(newstats);
1821         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1822         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1823         preempt_enable();
1824
1825         return newstats;
1826 }
1827
1828 static void nft_chain_stats_replace(struct nft_trans *trans)
1829 {
1830         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1831
1832         if (!nft_trans_chain_stats(trans))
1833                 return;
1834
1835         nft_trans_chain_stats(trans) =
1836                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1837                                     lockdep_commit_lock_is_held(trans->ctx.net));
1838
1839         if (!nft_trans_chain_stats(trans))
1840                 static_branch_inc(&nft_counters_enabled);
1841 }
1842
1843 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1844 {
1845         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1846         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1847
1848         if (g0 != g1)
1849                 kvfree(g1);
1850         kvfree(g0);
1851
1852         /* should be NULL either via abort or via successful commit */
1853         WARN_ON_ONCE(chain->blob_next);
1854         kvfree(chain->blob_next);
1855 }
1856
1857 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1858 {
1859         struct nft_chain *chain = ctx->chain;
1860         struct nft_hook *hook, *next;
1861
1862         if (WARN_ON(chain->use > 0))
1863                 return;
1864
1865         /* no concurrent access possible anymore */
1866         nf_tables_chain_free_chain_rules(chain);
1867
1868         if (nft_is_base_chain(chain)) {
1869                 struct nft_base_chain *basechain = nft_base_chain(chain);
1870
1871                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1872                         list_for_each_entry_safe(hook, next,
1873                                                  &basechain->hook_list, list) {
1874                                 list_del_rcu(&hook->list);
1875                                 kfree_rcu(hook, rcu);
1876                         }
1877                 }
1878                 module_put(basechain->type->owner);
1879                 if (rcu_access_pointer(basechain->stats)) {
1880                         static_branch_dec(&nft_counters_enabled);
1881                         free_percpu(rcu_dereference_raw(basechain->stats));
1882                 }
1883                 kfree(chain->name);
1884                 kfree(chain->udata);
1885                 kfree(basechain);
1886         } else {
1887                 kfree(chain->name);
1888                 kfree(chain->udata);
1889                 kfree(chain);
1890         }
1891 }
1892
1893 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1894                                               const struct nlattr *attr)
1895 {
1896         struct net_device *dev;
1897         char ifname[IFNAMSIZ];
1898         struct nft_hook *hook;
1899         int err;
1900
1901         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1902         if (!hook) {
1903                 err = -ENOMEM;
1904                 goto err_hook_alloc;
1905         }
1906
1907         nla_strscpy(ifname, attr, IFNAMSIZ);
1908         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1909          * indirectly serializing all the other holders of the commit_mutex with
1910          * the rtnl_mutex.
1911          */
1912         dev = __dev_get_by_name(net, ifname);
1913         if (!dev) {
1914                 err = -ENOENT;
1915                 goto err_hook_dev;
1916         }
1917         hook->ops.dev = dev;
1918
1919         return hook;
1920
1921 err_hook_dev:
1922         kfree(hook);
1923 err_hook_alloc:
1924         return ERR_PTR(err);
1925 }
1926
1927 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1928                                            const struct nft_hook *this)
1929 {
1930         struct nft_hook *hook;
1931
1932         list_for_each_entry(hook, hook_list, list) {
1933                 if (this->ops.dev == hook->ops.dev)
1934                         return hook;
1935         }
1936
1937         return NULL;
1938 }
1939
1940 static int nf_tables_parse_netdev_hooks(struct net *net,
1941                                         const struct nlattr *attr,
1942                                         struct list_head *hook_list)
1943 {
1944         struct nft_hook *hook, *next;
1945         const struct nlattr *tmp;
1946         int rem, n = 0, err;
1947
1948         nla_for_each_nested(tmp, attr, rem) {
1949                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1950                         err = -EINVAL;
1951                         goto err_hook;
1952                 }
1953
1954                 hook = nft_netdev_hook_alloc(net, tmp);
1955                 if (IS_ERR(hook)) {
1956                         err = PTR_ERR(hook);
1957                         goto err_hook;
1958                 }
1959                 if (nft_hook_list_find(hook_list, hook)) {
1960                         kfree(hook);
1961                         err = -EEXIST;
1962                         goto err_hook;
1963                 }
1964                 list_add_tail(&hook->list, hook_list);
1965                 n++;
1966
1967                 if (n == NFT_NETDEVICE_MAX) {
1968                         err = -EFBIG;
1969                         goto err_hook;
1970                 }
1971         }
1972
1973         return 0;
1974
1975 err_hook:
1976         list_for_each_entry_safe(hook, next, hook_list, list) {
1977                 list_del(&hook->list);
1978                 kfree(hook);
1979         }
1980         return err;
1981 }
1982
1983 struct nft_chain_hook {
1984         u32                             num;
1985         s32                             priority;
1986         const struct nft_chain_type     *type;
1987         struct list_head                list;
1988 };
1989
1990 static int nft_chain_parse_netdev(struct net *net,
1991                                   struct nlattr *tb[],
1992                                   struct list_head *hook_list)
1993 {
1994         struct nft_hook *hook;
1995         int err;
1996
1997         if (tb[NFTA_HOOK_DEV]) {
1998                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1999                 if (IS_ERR(hook))
2000                         return PTR_ERR(hook);
2001
2002                 list_add_tail(&hook->list, hook_list);
2003         } else if (tb[NFTA_HOOK_DEVS]) {
2004                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2005                                                    hook_list);
2006                 if (err < 0)
2007                         return err;
2008
2009                 if (list_empty(hook_list))
2010                         return -EINVAL;
2011         } else {
2012                 return -EINVAL;
2013         }
2014
2015         return 0;
2016 }
2017
2018 static int nft_chain_parse_hook(struct net *net,
2019                                 const struct nlattr * const nla[],
2020                                 struct nft_chain_hook *hook, u8 family,
2021                                 struct netlink_ext_ack *extack, bool autoload)
2022 {
2023         struct nftables_pernet *nft_net = nft_pernet(net);
2024         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2025         const struct nft_chain_type *type;
2026         int err;
2027
2028         lockdep_assert_held(&nft_net->commit_mutex);
2029         lockdep_nfnl_nft_mutex_not_held();
2030
2031         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2032                                           nla[NFTA_CHAIN_HOOK],
2033                                           nft_hook_policy, NULL);
2034         if (err < 0)
2035                 return err;
2036
2037         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2038             ha[NFTA_HOOK_PRIORITY] == NULL)
2039                 return -EINVAL;
2040
2041         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2042         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2043
2044         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2045         if (!type)
2046                 return -EOPNOTSUPP;
2047
2048         if (nla[NFTA_CHAIN_TYPE]) {
2049                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2050                                                    family, autoload);
2051                 if (IS_ERR(type)) {
2052                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2053                         return PTR_ERR(type);
2054                 }
2055         }
2056         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2057                 return -EOPNOTSUPP;
2058
2059         if (type->type == NFT_CHAIN_T_NAT &&
2060             hook->priority <= NF_IP_PRI_CONNTRACK)
2061                 return -EOPNOTSUPP;
2062
2063         if (!try_module_get(type->owner)) {
2064                 if (nla[NFTA_CHAIN_TYPE])
2065                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2066                 return -ENOENT;
2067         }
2068
2069         hook->type = type;
2070
2071         INIT_LIST_HEAD(&hook->list);
2072         if (nft_base_chain_netdev(family, hook->num)) {
2073                 err = nft_chain_parse_netdev(net, ha, &hook->list);
2074                 if (err < 0) {
2075                         module_put(type->owner);
2076                         return err;
2077                 }
2078         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2079                 module_put(type->owner);
2080                 return -EOPNOTSUPP;
2081         }
2082
2083         return 0;
2084 }
2085
2086 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2087 {
2088         struct nft_hook *h, *next;
2089
2090         list_for_each_entry_safe(h, next, &hook->list, list) {
2091                 list_del(&h->list);
2092                 kfree(h);
2093         }
2094         module_put(hook->type->owner);
2095 }
2096
2097 struct nft_rules_old {
2098         struct rcu_head h;
2099         struct nft_rule_blob *blob;
2100 };
2101
2102 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2103 {
2104         struct nft_rule_dp *prule;
2105
2106         prule = (struct nft_rule_dp *)ptr;
2107         prule->is_last = 1;
2108         /* blob size does not include the trailer rule */
2109 }
2110
2111 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2112 {
2113         struct nft_rule_blob *blob;
2114
2115         /* size must include room for the last rule */
2116         if (size < offsetof(struct nft_rule_dp, data))
2117                 return NULL;
2118
2119         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2120         if (size > INT_MAX)
2121                 return NULL;
2122
2123         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2124         if (!blob)
2125                 return NULL;
2126
2127         blob->size = 0;
2128         nft_last_rule(blob, blob->data);
2129
2130         return blob;
2131 }
2132
2133 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2134                                     const struct nft_chain_hook *hook,
2135                                     struct nft_chain *chain)
2136 {
2137         ops->pf                 = family;
2138         ops->hooknum            = hook->num;
2139         ops->priority           = hook->priority;
2140         ops->priv               = chain;
2141         ops->hook               = hook->type->hooks[ops->hooknum];
2142         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2143 }
2144
2145 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2146                               struct nft_chain_hook *hook, u32 flags)
2147 {
2148         struct nft_chain *chain;
2149         struct nft_hook *h;
2150
2151         basechain->type = hook->type;
2152         INIT_LIST_HEAD(&basechain->hook_list);
2153         chain = &basechain->chain;
2154
2155         if (nft_base_chain_netdev(family, hook->num)) {
2156                 list_splice_init(&hook->list, &basechain->hook_list);
2157                 list_for_each_entry(h, &basechain->hook_list, list)
2158                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2159
2160                 basechain->ops.hooknum  = hook->num;
2161                 basechain->ops.priority = hook->priority;
2162         } else {
2163                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2164         }
2165
2166         chain->flags |= NFT_CHAIN_BASE | flags;
2167         basechain->policy = NF_ACCEPT;
2168         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2169             !nft_chain_offload_support(basechain))
2170                 return -EOPNOTSUPP;
2171
2172         flow_block_init(&basechain->flow_block);
2173
2174         return 0;
2175 }
2176
2177 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2178 {
2179         int err;
2180
2181         err = rhltable_insert_key(&table->chains_ht, chain->name,
2182                                   &chain->rhlhead, nft_chain_ht_params);
2183         if (err)
2184                 return err;
2185
2186         list_add_tail_rcu(&chain->list, &table->chains);
2187
2188         return 0;
2189 }
2190
2191 static u64 chain_id;
2192
2193 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2194                               u8 policy, u32 flags,
2195                               struct netlink_ext_ack *extack)
2196 {
2197         const struct nlattr * const *nla = ctx->nla;
2198         struct nft_table *table = ctx->table;
2199         struct nft_base_chain *basechain;
2200         struct nft_stats __percpu *stats;
2201         struct net *net = ctx->net;
2202         char name[NFT_NAME_MAXLEN];
2203         struct nft_rule_blob *blob;
2204         struct nft_trans *trans;
2205         struct nft_chain *chain;
2206         unsigned int data_size;
2207         int err;
2208
2209         if (table->use == UINT_MAX)
2210                 return -EOVERFLOW;
2211
2212         if (nla[NFTA_CHAIN_HOOK]) {
2213                 struct nft_chain_hook hook;
2214
2215                 if (flags & NFT_CHAIN_BINDING)
2216                         return -EOPNOTSUPP;
2217
2218                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2219                                            true);
2220                 if (err < 0)
2221                         return err;
2222
2223                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2224                 if (basechain == NULL) {
2225                         nft_chain_release_hook(&hook);
2226                         return -ENOMEM;
2227                 }
2228                 chain = &basechain->chain;
2229
2230                 if (nla[NFTA_CHAIN_COUNTERS]) {
2231                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2232                         if (IS_ERR(stats)) {
2233                                 nft_chain_release_hook(&hook);
2234                                 kfree(basechain);
2235                                 return PTR_ERR(stats);
2236                         }
2237                         rcu_assign_pointer(basechain->stats, stats);
2238                         static_branch_inc(&nft_counters_enabled);
2239                 }
2240
2241                 err = nft_basechain_init(basechain, family, &hook, flags);
2242                 if (err < 0) {
2243                         nft_chain_release_hook(&hook);
2244                         kfree(basechain);
2245                         return err;
2246                 }
2247         } else {
2248                 if (flags & NFT_CHAIN_BASE)
2249                         return -EINVAL;
2250                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2251                         return -EOPNOTSUPP;
2252
2253                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2254                 if (chain == NULL)
2255                         return -ENOMEM;
2256
2257                 chain->flags = flags;
2258         }
2259         ctx->chain = chain;
2260
2261         INIT_LIST_HEAD(&chain->rules);
2262         chain->handle = nf_tables_alloc_handle(table);
2263         chain->table = table;
2264
2265         if (nla[NFTA_CHAIN_NAME]) {
2266                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2267         } else {
2268                 if (!(flags & NFT_CHAIN_BINDING)) {
2269                         err = -EINVAL;
2270                         goto err_destroy_chain;
2271                 }
2272
2273                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2274                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2275         }
2276
2277         if (!chain->name) {
2278                 err = -ENOMEM;
2279                 goto err_destroy_chain;
2280         }
2281
2282         if (nla[NFTA_CHAIN_USERDATA]) {
2283                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2284                 if (chain->udata == NULL) {
2285                         err = -ENOMEM;
2286                         goto err_destroy_chain;
2287                 }
2288                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2289         }
2290
2291         data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2292         blob = nf_tables_chain_alloc_rules(data_size);
2293         if (!blob) {
2294                 err = -ENOMEM;
2295                 goto err_destroy_chain;
2296         }
2297
2298         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2299         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2300
2301         err = nf_tables_register_hook(net, table, chain);
2302         if (err < 0)
2303                 goto err_destroy_chain;
2304
2305         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2306         if (IS_ERR(trans)) {
2307                 err = PTR_ERR(trans);
2308                 goto err_unregister_hook;
2309         }
2310
2311         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2312         if (nft_is_base_chain(chain))
2313                 nft_trans_chain_policy(trans) = policy;
2314
2315         err = nft_chain_add(table, chain);
2316         if (err < 0) {
2317                 nft_trans_destroy(trans);
2318                 goto err_unregister_hook;
2319         }
2320
2321         table->use++;
2322
2323         return 0;
2324 err_unregister_hook:
2325         nf_tables_unregister_hook(net, table, chain);
2326 err_destroy_chain:
2327         nf_tables_chain_destroy(ctx);
2328
2329         return err;
2330 }
2331
2332 static bool nft_hook_list_equal(struct list_head *hook_list1,
2333                                 struct list_head *hook_list2)
2334 {
2335         struct nft_hook *hook;
2336         int n = 0, m = 0;
2337
2338         n = 0;
2339         list_for_each_entry(hook, hook_list2, list) {
2340                 if (!nft_hook_list_find(hook_list1, hook))
2341                         return false;
2342
2343                 n++;
2344         }
2345         list_for_each_entry(hook, hook_list1, list)
2346                 m++;
2347
2348         return n == m;
2349 }
2350
2351 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2352                               u32 flags, const struct nlattr *attr,
2353                               struct netlink_ext_ack *extack)
2354 {
2355         const struct nlattr * const *nla = ctx->nla;
2356         struct nft_table *table = ctx->table;
2357         struct nft_chain *chain = ctx->chain;
2358         struct nft_base_chain *basechain;
2359         struct nft_stats *stats = NULL;
2360         struct nft_chain_hook hook;
2361         struct nf_hook_ops *ops;
2362         struct nft_trans *trans;
2363         int err;
2364
2365         if (chain->flags ^ flags)
2366                 return -EOPNOTSUPP;
2367
2368         if (nla[NFTA_CHAIN_HOOK]) {
2369                 if (!nft_is_base_chain(chain)) {
2370                         NL_SET_BAD_ATTR(extack, attr);
2371                         return -EEXIST;
2372                 }
2373                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2374                                            extack, false);
2375                 if (err < 0)
2376                         return err;
2377
2378                 basechain = nft_base_chain(chain);
2379                 if (basechain->type != hook.type) {
2380                         nft_chain_release_hook(&hook);
2381                         NL_SET_BAD_ATTR(extack, attr);
2382                         return -EEXIST;
2383                 }
2384
2385                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2386                         if (!nft_hook_list_equal(&basechain->hook_list,
2387                                                  &hook.list)) {
2388                                 nft_chain_release_hook(&hook);
2389                                 NL_SET_BAD_ATTR(extack, attr);
2390                                 return -EEXIST;
2391                         }
2392                 } else {
2393                         ops = &basechain->ops;
2394                         if (ops->hooknum != hook.num ||
2395                             ops->priority != hook.priority) {
2396                                 nft_chain_release_hook(&hook);
2397                                 NL_SET_BAD_ATTR(extack, attr);
2398                                 return -EEXIST;
2399                         }
2400                 }
2401                 nft_chain_release_hook(&hook);
2402         }
2403
2404         if (nla[NFTA_CHAIN_HANDLE] &&
2405             nla[NFTA_CHAIN_NAME]) {
2406                 struct nft_chain *chain2;
2407
2408                 chain2 = nft_chain_lookup(ctx->net, table,
2409                                           nla[NFTA_CHAIN_NAME], genmask);
2410                 if (!IS_ERR(chain2)) {
2411                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2412                         return -EEXIST;
2413                 }
2414         }
2415
2416         if (nla[NFTA_CHAIN_COUNTERS]) {
2417                 if (!nft_is_base_chain(chain))
2418                         return -EOPNOTSUPP;
2419
2420                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2421                 if (IS_ERR(stats))
2422                         return PTR_ERR(stats);
2423         }
2424
2425         err = -ENOMEM;
2426         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2427                                 sizeof(struct nft_trans_chain));
2428         if (trans == NULL)
2429                 goto err;
2430
2431         nft_trans_chain_stats(trans) = stats;
2432         nft_trans_chain_update(trans) = true;
2433
2434         if (nla[NFTA_CHAIN_POLICY])
2435                 nft_trans_chain_policy(trans) = policy;
2436         else
2437                 nft_trans_chain_policy(trans) = -1;
2438
2439         if (nla[NFTA_CHAIN_HANDLE] &&
2440             nla[NFTA_CHAIN_NAME]) {
2441                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2442                 struct nft_trans *tmp;
2443                 char *name;
2444
2445                 err = -ENOMEM;
2446                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2447                 if (!name)
2448                         goto err;
2449
2450                 err = -EEXIST;
2451                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2452                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2453                             tmp->ctx.table == table &&
2454                             nft_trans_chain_update(tmp) &&
2455                             nft_trans_chain_name(tmp) &&
2456                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2457                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2458                                 kfree(name);
2459                                 goto err;
2460                         }
2461                 }
2462
2463                 nft_trans_chain_name(trans) = name;
2464         }
2465         nft_trans_commit_list_add_tail(ctx->net, trans);
2466
2467         return 0;
2468 err:
2469         free_percpu(stats);
2470         kfree(trans);
2471         return err;
2472 }
2473
2474 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2475                                                const struct nlattr *nla)
2476 {
2477         struct nftables_pernet *nft_net = nft_pernet(net);
2478         u32 id = ntohl(nla_get_be32(nla));
2479         struct nft_trans *trans;
2480
2481         list_for_each_entry(trans, &nft_net->commit_list, list) {
2482                 struct nft_chain *chain = trans->ctx.chain;
2483
2484                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2485                     id == nft_trans_chain_id(trans))
2486                         return chain;
2487         }
2488         return ERR_PTR(-ENOENT);
2489 }
2490
2491 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2492                               const struct nlattr * const nla[])
2493 {
2494         struct nftables_pernet *nft_net = nft_pernet(info->net);
2495         struct netlink_ext_ack *extack = info->extack;
2496         u8 genmask = nft_genmask_next(info->net);
2497         u8 family = info->nfmsg->nfgen_family;
2498         struct nft_chain *chain = NULL;
2499         struct net *net = info->net;
2500         const struct nlattr *attr;
2501         struct nft_table *table;
2502         u8 policy = NF_ACCEPT;
2503         struct nft_ctx ctx;
2504         u64 handle = 0;
2505         u32 flags = 0;
2506
2507         lockdep_assert_held(&nft_net->commit_mutex);
2508
2509         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2510                                  NETLINK_CB(skb).portid);
2511         if (IS_ERR(table)) {
2512                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2513                 return PTR_ERR(table);
2514         }
2515
2516         chain = NULL;
2517         attr = nla[NFTA_CHAIN_NAME];
2518
2519         if (nla[NFTA_CHAIN_HANDLE]) {
2520                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2521                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2522                 if (IS_ERR(chain)) {
2523                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2524                         return PTR_ERR(chain);
2525                 }
2526                 attr = nla[NFTA_CHAIN_HANDLE];
2527         } else if (nla[NFTA_CHAIN_NAME]) {
2528                 chain = nft_chain_lookup(net, table, attr, genmask);
2529                 if (IS_ERR(chain)) {
2530                         if (PTR_ERR(chain) != -ENOENT) {
2531                                 NL_SET_BAD_ATTR(extack, attr);
2532                                 return PTR_ERR(chain);
2533                         }
2534                         chain = NULL;
2535                 }
2536         } else if (!nla[NFTA_CHAIN_ID]) {
2537                 return -EINVAL;
2538         }
2539
2540         if (nla[NFTA_CHAIN_POLICY]) {
2541                 if (chain != NULL &&
2542                     !nft_is_base_chain(chain)) {
2543                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2544                         return -EOPNOTSUPP;
2545                 }
2546
2547                 if (chain == NULL &&
2548                     nla[NFTA_CHAIN_HOOK] == NULL) {
2549                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2550                         return -EOPNOTSUPP;
2551                 }
2552
2553                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2554                 switch (policy) {
2555                 case NF_DROP:
2556                 case NF_ACCEPT:
2557                         break;
2558                 default:
2559                         return -EINVAL;
2560                 }
2561         }
2562
2563         if (nla[NFTA_CHAIN_FLAGS])
2564                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2565         else if (chain)
2566                 flags = chain->flags;
2567
2568         if (flags & ~NFT_CHAIN_FLAGS)
2569                 return -EOPNOTSUPP;
2570
2571         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2572
2573         if (chain != NULL) {
2574                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2575                         NL_SET_BAD_ATTR(extack, attr);
2576                         return -EEXIST;
2577                 }
2578                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2579                         return -EOPNOTSUPP;
2580
2581                 flags |= chain->flags & NFT_CHAIN_BASE;
2582                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2583                                           extack);
2584         }
2585
2586         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2587 }
2588
2589 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2590                               const struct nlattr * const nla[])
2591 {
2592         struct netlink_ext_ack *extack = info->extack;
2593         u8 genmask = nft_genmask_next(info->net);
2594         u8 family = info->nfmsg->nfgen_family;
2595         struct net *net = info->net;
2596         const struct nlattr *attr;
2597         struct nft_table *table;
2598         struct nft_chain *chain;
2599         struct nft_rule *rule;
2600         struct nft_ctx ctx;
2601         u64 handle;
2602         u32 use;
2603         int err;
2604
2605         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2606                                  NETLINK_CB(skb).portid);
2607         if (IS_ERR(table)) {
2608                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2609                 return PTR_ERR(table);
2610         }
2611
2612         if (nla[NFTA_CHAIN_HANDLE]) {
2613                 attr = nla[NFTA_CHAIN_HANDLE];
2614                 handle = be64_to_cpu(nla_get_be64(attr));
2615                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2616         } else {
2617                 attr = nla[NFTA_CHAIN_NAME];
2618                 chain = nft_chain_lookup(net, table, attr, genmask);
2619         }
2620         if (IS_ERR(chain)) {
2621                 NL_SET_BAD_ATTR(extack, attr);
2622                 return PTR_ERR(chain);
2623         }
2624
2625         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2626             chain->use > 0)
2627                 return -EBUSY;
2628
2629         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2630
2631         use = chain->use;
2632         list_for_each_entry(rule, &chain->rules, list) {
2633                 if (!nft_is_active_next(net, rule))
2634                         continue;
2635                 use--;
2636
2637                 err = nft_delrule(&ctx, rule);
2638                 if (err < 0)
2639                         return err;
2640         }
2641
2642         /* There are rules and elements that are still holding references to us,
2643          * we cannot do a recursive removal in this case.
2644          */
2645         if (use > 0) {
2646                 NL_SET_BAD_ATTR(extack, attr);
2647                 return -EBUSY;
2648         }
2649
2650         return nft_delchain(&ctx);
2651 }
2652
2653 /*
2654  * Expressions
2655  */
2656
2657 /**
2658  *      nft_register_expr - register nf_tables expr type
2659  *      @type: expr type
2660  *
2661  *      Registers the expr type for use with nf_tables. Returns zero on
2662  *      success or a negative errno code otherwise.
2663  */
2664 int nft_register_expr(struct nft_expr_type *type)
2665 {
2666         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2667         if (type->family == NFPROTO_UNSPEC)
2668                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2669         else
2670                 list_add_rcu(&type->list, &nf_tables_expressions);
2671         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2672         return 0;
2673 }
2674 EXPORT_SYMBOL_GPL(nft_register_expr);
2675
2676 /**
2677  *      nft_unregister_expr - unregister nf_tables expr type
2678  *      @type: expr type
2679  *
2680  *      Unregisters the expr typefor use with nf_tables.
2681  */
2682 void nft_unregister_expr(struct nft_expr_type *type)
2683 {
2684         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2685         list_del_rcu(&type->list);
2686         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2687 }
2688 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2689
2690 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2691                                                        struct nlattr *nla)
2692 {
2693         const struct nft_expr_type *type, *candidate = NULL;
2694
2695         list_for_each_entry(type, &nf_tables_expressions, list) {
2696                 if (!nla_strcmp(nla, type->name)) {
2697                         if (!type->family && !candidate)
2698                                 candidate = type;
2699                         else if (type->family == family)
2700                                 candidate = type;
2701                 }
2702         }
2703         return candidate;
2704 }
2705
2706 #ifdef CONFIG_MODULES
2707 static int nft_expr_type_request_module(struct net *net, u8 family,
2708                                         struct nlattr *nla)
2709 {
2710         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2711                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2712                 return -EAGAIN;
2713
2714         return 0;
2715 }
2716 #endif
2717
2718 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2719                                                      u8 family,
2720                                                      struct nlattr *nla)
2721 {
2722         const struct nft_expr_type *type;
2723
2724         if (nla == NULL)
2725                 return ERR_PTR(-EINVAL);
2726
2727         type = __nft_expr_type_get(family, nla);
2728         if (type != NULL && try_module_get(type->owner))
2729                 return type;
2730
2731         lockdep_nfnl_nft_mutex_not_held();
2732 #ifdef CONFIG_MODULES
2733         if (type == NULL) {
2734                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2735                         return ERR_PTR(-EAGAIN);
2736
2737                 if (nft_request_module(net, "nft-expr-%.*s",
2738                                        nla_len(nla),
2739                                        (char *)nla_data(nla)) == -EAGAIN)
2740                         return ERR_PTR(-EAGAIN);
2741         }
2742 #endif
2743         return ERR_PTR(-ENOENT);
2744 }
2745
2746 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2747         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2748                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2749         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2750 };
2751
2752 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2753                                     const struct nft_expr *expr)
2754 {
2755         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2756                 goto nla_put_failure;
2757
2758         if (expr->ops->dump) {
2759                 struct nlattr *data = nla_nest_start_noflag(skb,
2760                                                             NFTA_EXPR_DATA);
2761                 if (data == NULL)
2762                         goto nla_put_failure;
2763                 if (expr->ops->dump(skb, expr) < 0)
2764                         goto nla_put_failure;
2765                 nla_nest_end(skb, data);
2766         }
2767
2768         return skb->len;
2769
2770 nla_put_failure:
2771         return -1;
2772 };
2773
2774 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2775                   const struct nft_expr *expr)
2776 {
2777         struct nlattr *nest;
2778
2779         nest = nla_nest_start_noflag(skb, attr);
2780         if (!nest)
2781                 goto nla_put_failure;
2782         if (nf_tables_fill_expr_info(skb, expr) < 0)
2783                 goto nla_put_failure;
2784         nla_nest_end(skb, nest);
2785         return 0;
2786
2787 nla_put_failure:
2788         return -1;
2789 }
2790
2791 struct nft_expr_info {
2792         const struct nft_expr_ops       *ops;
2793         const struct nlattr             *attr;
2794         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2795 };
2796
2797 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2798                                 const struct nlattr *nla,
2799                                 struct nft_expr_info *info)
2800 {
2801         const struct nft_expr_type *type;
2802         const struct nft_expr_ops *ops;
2803         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2804         int err;
2805
2806         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2807                                           nft_expr_policy, NULL);
2808         if (err < 0)
2809                 return err;
2810
2811         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2812         if (IS_ERR(type))
2813                 return PTR_ERR(type);
2814
2815         if (tb[NFTA_EXPR_DATA]) {
2816                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2817                                                   tb[NFTA_EXPR_DATA],
2818                                                   type->policy, NULL);
2819                 if (err < 0)
2820                         goto err1;
2821         } else
2822                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2823
2824         if (type->select_ops != NULL) {
2825                 ops = type->select_ops(ctx,
2826                                        (const struct nlattr * const *)info->tb);
2827                 if (IS_ERR(ops)) {
2828                         err = PTR_ERR(ops);
2829 #ifdef CONFIG_MODULES
2830                         if (err == -EAGAIN)
2831                                 if (nft_expr_type_request_module(ctx->net,
2832                                                                  ctx->family,
2833                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2834                                         err = -ENOENT;
2835 #endif
2836                         goto err1;
2837                 }
2838         } else
2839                 ops = type->ops;
2840
2841         info->attr = nla;
2842         info->ops = ops;
2843
2844         return 0;
2845
2846 err1:
2847         module_put(type->owner);
2848         return err;
2849 }
2850
2851 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2852                              const struct nft_expr_info *expr_info,
2853                              struct nft_expr *expr)
2854 {
2855         const struct nft_expr_ops *ops = expr_info->ops;
2856         int err;
2857
2858         expr->ops = ops;
2859         if (ops->init) {
2860                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2861                 if (err < 0)
2862                         goto err1;
2863         }
2864
2865         return 0;
2866 err1:
2867         expr->ops = NULL;
2868         return err;
2869 }
2870
2871 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2872                                    struct nft_expr *expr)
2873 {
2874         const struct nft_expr_type *type = expr->ops->type;
2875
2876         if (expr->ops->destroy)
2877                 expr->ops->destroy(ctx, expr);
2878         module_put(type->owner);
2879 }
2880
2881 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2882                                       const struct nlattr *nla)
2883 {
2884         struct nft_expr_info expr_info;
2885         struct nft_expr *expr;
2886         struct module *owner;
2887         int err;
2888
2889         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2890         if (err < 0)
2891                 goto err_expr_parse;
2892
2893         err = -EOPNOTSUPP;
2894         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2895                 goto err_expr_stateful;
2896
2897         err = -ENOMEM;
2898         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2899         if (expr == NULL)
2900                 goto err_expr_stateful;
2901
2902         err = nf_tables_newexpr(ctx, &expr_info, expr);
2903         if (err < 0)
2904                 goto err_expr_new;
2905
2906         return expr;
2907 err_expr_new:
2908         kfree(expr);
2909 err_expr_stateful:
2910         owner = expr_info.ops->type->owner;
2911         if (expr_info.ops->type->release_ops)
2912                 expr_info.ops->type->release_ops(expr_info.ops);
2913
2914         module_put(owner);
2915 err_expr_parse:
2916         return ERR_PTR(err);
2917 }
2918
2919 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2920 {
2921         int err;
2922
2923         if (src->ops->clone) {
2924                 dst->ops = src->ops;
2925                 err = src->ops->clone(dst, src);
2926                 if (err < 0)
2927                         return err;
2928         } else {
2929                 memcpy(dst, src, src->ops->size);
2930         }
2931
2932         __module_get(src->ops->type->owner);
2933
2934         return 0;
2935 }
2936
2937 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2938 {
2939         nf_tables_expr_destroy(ctx, expr);
2940         kfree(expr);
2941 }
2942
2943 /*
2944  * Rules
2945  */
2946
2947 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2948                                           u64 handle)
2949 {
2950         struct nft_rule *rule;
2951
2952         // FIXME: this sucks
2953         list_for_each_entry_rcu(rule, &chain->rules, list) {
2954                 if (handle == rule->handle)
2955                         return rule;
2956         }
2957
2958         return ERR_PTR(-ENOENT);
2959 }
2960
2961 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2962                                         const struct nlattr *nla)
2963 {
2964         if (nla == NULL)
2965                 return ERR_PTR(-EINVAL);
2966
2967         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2968 }
2969
2970 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2971         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2972                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2973         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2974                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2975         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2976         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2977         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2978         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2979         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2980                                     .len = NFT_USERDATA_MAXLEN },
2981         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2982         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2983         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2984 };
2985
2986 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2987                                     u32 portid, u32 seq, int event,
2988                                     u32 flags, int family,
2989                                     const struct nft_table *table,
2990                                     const struct nft_chain *chain,
2991                                     const struct nft_rule *rule, u64 handle)
2992 {
2993         struct nlmsghdr *nlh;
2994         const struct nft_expr *expr, *next;
2995         struct nlattr *list;
2996         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2997
2998         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2999                            nft_base_seq(net));
3000         if (!nlh)
3001                 goto nla_put_failure;
3002
3003         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3004                 goto nla_put_failure;
3005         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3006                 goto nla_put_failure;
3007         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3008                          NFTA_RULE_PAD))
3009                 goto nla_put_failure;
3010
3011         if (event != NFT_MSG_DELRULE && handle) {
3012                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3013                                  NFTA_RULE_PAD))
3014                         goto nla_put_failure;
3015         }
3016
3017         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3018                 nft_flow_rule_stats(chain, rule);
3019
3020         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3021         if (list == NULL)
3022                 goto nla_put_failure;
3023         nft_rule_for_each_expr(expr, next, rule) {
3024                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3025                         goto nla_put_failure;
3026         }
3027         nla_nest_end(skb, list);
3028
3029         if (rule->udata) {
3030                 struct nft_userdata *udata = nft_userdata(rule);
3031                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3032                             udata->data) < 0)
3033                         goto nla_put_failure;
3034         }
3035
3036         nlmsg_end(skb, nlh);
3037         return 0;
3038
3039 nla_put_failure:
3040         nlmsg_trim(skb, nlh);
3041         return -1;
3042 }
3043
3044 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3045                                   const struct nft_rule *rule, int event)
3046 {
3047         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3048         const struct nft_rule *prule;
3049         struct sk_buff *skb;
3050         u64 handle = 0;
3051         u16 flags = 0;
3052         int err;
3053
3054         if (!ctx->report &&
3055             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3056                 return;
3057
3058         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3059         if (skb == NULL)
3060                 goto err;
3061
3062         if (event == NFT_MSG_NEWRULE &&
3063             !list_is_first(&rule->list, &ctx->chain->rules) &&
3064             !list_is_last(&rule->list, &ctx->chain->rules)) {
3065                 prule = list_prev_entry(rule, list);
3066                 handle = prule->handle;
3067         }
3068         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3069                 flags |= NLM_F_APPEND;
3070         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3071                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3072
3073         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3074                                        event, flags, ctx->family, ctx->table,
3075                                        ctx->chain, rule, handle);
3076         if (err < 0) {
3077                 kfree_skb(skb);
3078                 goto err;
3079         }
3080
3081         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3082         return;
3083 err:
3084         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3085 }
3086
3087 struct nft_rule_dump_ctx {
3088         char *table;
3089         char *chain;
3090 };
3091
3092 static int __nf_tables_dump_rules(struct sk_buff *skb,
3093                                   unsigned int *idx,
3094                                   struct netlink_callback *cb,
3095                                   const struct nft_table *table,
3096                                   const struct nft_chain *chain)
3097 {
3098         struct net *net = sock_net(skb->sk);
3099         const struct nft_rule *rule, *prule;
3100         unsigned int s_idx = cb->args[0];
3101         u64 handle;
3102
3103         prule = NULL;
3104         list_for_each_entry_rcu(rule, &chain->rules, list) {
3105                 if (!nft_is_active(net, rule))
3106                         goto cont_skip;
3107                 if (*idx < s_idx)
3108                         goto cont;
3109                 if (*idx > s_idx) {
3110                         memset(&cb->args[1], 0,
3111                                         sizeof(cb->args) - sizeof(cb->args[0]));
3112                 }
3113                 if (prule)
3114                         handle = prule->handle;
3115                 else
3116                         handle = 0;
3117
3118                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3119                                         cb->nlh->nlmsg_seq,
3120                                         NFT_MSG_NEWRULE,
3121                                         NLM_F_MULTI | NLM_F_APPEND,
3122                                         table->family,
3123                                         table, chain, rule, handle) < 0)
3124                         return 1;
3125
3126                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3127 cont:
3128                 prule = rule;
3129 cont_skip:
3130                 (*idx)++;
3131         }
3132         return 0;
3133 }
3134
3135 static int nf_tables_dump_rules(struct sk_buff *skb,
3136                                 struct netlink_callback *cb)
3137 {
3138         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3139         const struct nft_rule_dump_ctx *ctx = cb->data;
3140         struct nft_table *table;
3141         const struct nft_chain *chain;
3142         unsigned int idx = 0;
3143         struct net *net = sock_net(skb->sk);
3144         int family = nfmsg->nfgen_family;
3145         struct nftables_pernet *nft_net;
3146
3147         rcu_read_lock();
3148         nft_net = nft_pernet(net);
3149         cb->seq = nft_net->base_seq;
3150
3151         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3152                 if (family != NFPROTO_UNSPEC && family != table->family)
3153                         continue;
3154
3155                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3156                         continue;
3157
3158                 if (ctx && ctx->table && ctx->chain) {
3159                         struct rhlist_head *list, *tmp;
3160
3161                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3162                                                nft_chain_ht_params);
3163                         if (!list)
3164                                 goto done;
3165
3166                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3167                                 if (!nft_is_active(net, chain))
3168                                         continue;
3169                                 __nf_tables_dump_rules(skb, &idx,
3170                                                        cb, table, chain);
3171                                 break;
3172                         }
3173                         goto done;
3174                 }
3175
3176                 list_for_each_entry_rcu(chain, &table->chains, list) {
3177                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3178                                 goto done;
3179                 }
3180
3181                 if (ctx && ctx->table)
3182                         break;
3183         }
3184 done:
3185         rcu_read_unlock();
3186
3187         cb->args[0] = idx;
3188         return skb->len;
3189 }
3190
3191 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3192 {
3193         const struct nlattr * const *nla = cb->data;
3194         struct nft_rule_dump_ctx *ctx = NULL;
3195
3196         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3197                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3198                 if (!ctx)
3199                         return -ENOMEM;
3200
3201                 if (nla[NFTA_RULE_TABLE]) {
3202                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3203                                                         GFP_ATOMIC);
3204                         if (!ctx->table) {
3205                                 kfree(ctx);
3206                                 return -ENOMEM;
3207                         }
3208                 }
3209                 if (nla[NFTA_RULE_CHAIN]) {
3210                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3211                                                 GFP_ATOMIC);
3212                         if (!ctx->chain) {
3213                                 kfree(ctx->table);
3214                                 kfree(ctx);
3215                                 return -ENOMEM;
3216                         }
3217                 }
3218         }
3219
3220         cb->data = ctx;
3221         return 0;
3222 }
3223
3224 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3225 {
3226         struct nft_rule_dump_ctx *ctx = cb->data;
3227
3228         if (ctx) {
3229                 kfree(ctx->table);
3230                 kfree(ctx->chain);
3231                 kfree(ctx);
3232         }
3233         return 0;
3234 }
3235
3236 /* called with rcu_read_lock held */
3237 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3238                              const struct nlattr * const nla[])
3239 {
3240         struct netlink_ext_ack *extack = info->extack;
3241         u8 genmask = nft_genmask_cur(info->net);
3242         u8 family = info->nfmsg->nfgen_family;
3243         const struct nft_chain *chain;
3244         const struct nft_rule *rule;
3245         struct net *net = info->net;
3246         struct nft_table *table;
3247         struct sk_buff *skb2;
3248         int err;
3249
3250         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3251                 struct netlink_dump_control c = {
3252                         .start= nf_tables_dump_rules_start,
3253                         .dump = nf_tables_dump_rules,
3254                         .done = nf_tables_dump_rules_done,
3255                         .module = THIS_MODULE,
3256                         .data = (void *)nla,
3257                 };
3258
3259                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3260         }
3261
3262         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3263         if (IS_ERR(table)) {
3264                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3265                 return PTR_ERR(table);
3266         }
3267
3268         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3269         if (IS_ERR(chain)) {
3270                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3271                 return PTR_ERR(chain);
3272         }
3273
3274         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3275         if (IS_ERR(rule)) {
3276                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3277                 return PTR_ERR(rule);
3278         }
3279
3280         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3281         if (!skb2)
3282                 return -ENOMEM;
3283
3284         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3285                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3286                                        family, table, chain, rule, 0);
3287         if (err < 0)
3288                 goto err_fill_rule_info;
3289
3290         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3291
3292 err_fill_rule_info:
3293         kfree_skb(skb2);
3294         return err;
3295 }
3296
3297 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3298                                    struct nft_rule *rule)
3299 {
3300         struct nft_expr *expr, *next;
3301
3302         /*
3303          * Careful: some expressions might not be initialized in case this
3304          * is called on error from nf_tables_newrule().
3305          */
3306         expr = nft_expr_first(rule);
3307         while (nft_expr_more(rule, expr)) {
3308                 next = nft_expr_next(expr);
3309                 nf_tables_expr_destroy(ctx, expr);
3310                 expr = next;
3311         }
3312         kfree(rule);
3313 }
3314
3315 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3316 {
3317         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3318         nf_tables_rule_destroy(ctx, rule);
3319 }
3320
3321 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3322 {
3323         struct nft_expr *expr, *last;
3324         const struct nft_data *data;
3325         struct nft_rule *rule;
3326         int err;
3327
3328         if (ctx->level == NFT_JUMP_STACK_SIZE)
3329                 return -EMLINK;
3330
3331         list_for_each_entry(rule, &chain->rules, list) {
3332                 if (!nft_is_active_next(ctx->net, rule))
3333                         continue;
3334
3335                 nft_rule_for_each_expr(expr, last, rule) {
3336                         if (!expr->ops->validate)
3337                                 continue;
3338
3339                         err = expr->ops->validate(ctx, expr, &data);
3340                         if (err < 0)
3341                                 return err;
3342                 }
3343         }
3344
3345         return 0;
3346 }
3347 EXPORT_SYMBOL_GPL(nft_chain_validate);
3348
3349 static int nft_table_validate(struct net *net, const struct nft_table *table)
3350 {
3351         struct nft_chain *chain;
3352         struct nft_ctx ctx = {
3353                 .net    = net,
3354                 .family = table->family,
3355         };
3356         int err;
3357
3358         list_for_each_entry(chain, &table->chains, list) {
3359                 if (!nft_is_base_chain(chain))
3360                         continue;
3361
3362                 ctx.chain = chain;
3363                 err = nft_chain_validate(&ctx, chain);
3364                 if (err < 0)
3365                         return err;
3366         }
3367
3368         return 0;
3369 }
3370
3371 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3372                                              const struct nlattr *nla);
3373
3374 #define NFT_RULE_MAXEXPRS       128
3375
3376 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3377                              const struct nlattr * const nla[])
3378 {
3379         struct nftables_pernet *nft_net = nft_pernet(info->net);
3380         struct netlink_ext_ack *extack = info->extack;
3381         unsigned int size, i, n, ulen = 0, usize = 0;
3382         u8 genmask = nft_genmask_next(info->net);
3383         struct nft_rule *rule, *old_rule = NULL;
3384         struct nft_expr_info *expr_info = NULL;
3385         u8 family = info->nfmsg->nfgen_family;
3386         struct nft_flow_rule *flow = NULL;
3387         struct net *net = info->net;
3388         struct nft_userdata *udata;
3389         struct nft_table *table;
3390         struct nft_chain *chain;
3391         struct nft_trans *trans;
3392         u64 handle, pos_handle;
3393         struct nft_expr *expr;
3394         struct nft_ctx ctx;
3395         struct nlattr *tmp;
3396         int err, rem;
3397
3398         lockdep_assert_held(&nft_net->commit_mutex);
3399
3400         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3401                                  NETLINK_CB(skb).portid);
3402         if (IS_ERR(table)) {
3403                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3404                 return PTR_ERR(table);
3405         }
3406
3407         if (nla[NFTA_RULE_CHAIN]) {
3408                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3409                                          genmask);
3410                 if (IS_ERR(chain)) {
3411                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3412                         return PTR_ERR(chain);
3413                 }
3414                 if (nft_chain_is_bound(chain))
3415                         return -EOPNOTSUPP;
3416
3417         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3418                 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3419                 if (IS_ERR(chain)) {
3420                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3421                         return PTR_ERR(chain);
3422                 }
3423         } else {
3424                 return -EINVAL;
3425         }
3426
3427         if (nla[NFTA_RULE_HANDLE]) {
3428                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3429                 rule = __nft_rule_lookup(chain, handle);
3430                 if (IS_ERR(rule)) {
3431                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3432                         return PTR_ERR(rule);
3433                 }
3434
3435                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3436                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3437                         return -EEXIST;
3438                 }
3439                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3440                         old_rule = rule;
3441                 else
3442                         return -EOPNOTSUPP;
3443         } else {
3444                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3445                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3446                         return -EINVAL;
3447                 handle = nf_tables_alloc_handle(table);
3448
3449                 if (chain->use == UINT_MAX)
3450                         return -EOVERFLOW;
3451
3452                 if (nla[NFTA_RULE_POSITION]) {
3453                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3454                         old_rule = __nft_rule_lookup(chain, pos_handle);
3455                         if (IS_ERR(old_rule)) {
3456                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3457                                 return PTR_ERR(old_rule);
3458                         }
3459                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3460                         old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3461                         if (IS_ERR(old_rule)) {
3462                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3463                                 return PTR_ERR(old_rule);
3464                         }
3465                 }
3466         }
3467
3468         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3469
3470         n = 0;
3471         size = 0;
3472         if (nla[NFTA_RULE_EXPRESSIONS]) {
3473                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3474                                            sizeof(struct nft_expr_info),
3475                                            GFP_KERNEL);
3476                 if (!expr_info)
3477                         return -ENOMEM;
3478
3479                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3480                         err = -EINVAL;
3481                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3482                                 goto err_release_expr;
3483                         if (n == NFT_RULE_MAXEXPRS)
3484                                 goto err_release_expr;
3485                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3486                         if (err < 0) {
3487                                 NL_SET_BAD_ATTR(extack, tmp);
3488                                 goto err_release_expr;
3489                         }
3490                         size += expr_info[n].ops->size;
3491                         n++;
3492                 }
3493         }
3494         /* Check for overflow of dlen field */
3495         err = -EFBIG;
3496         if (size >= 1 << 12)
3497                 goto err_release_expr;
3498
3499         if (nla[NFTA_RULE_USERDATA]) {
3500                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3501                 if (ulen > 0)
3502                         usize = sizeof(struct nft_userdata) + ulen;
3503         }
3504
3505         err = -ENOMEM;
3506         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3507         if (rule == NULL)
3508                 goto err_release_expr;
3509
3510         nft_activate_next(net, rule);
3511
3512         rule->handle = handle;
3513         rule->dlen   = size;
3514         rule->udata  = ulen ? 1 : 0;
3515
3516         if (ulen) {
3517                 udata = nft_userdata(rule);
3518                 udata->len = ulen - 1;
3519                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3520         }
3521
3522         expr = nft_expr_first(rule);
3523         for (i = 0; i < n; i++) {
3524                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3525                 if (err < 0) {
3526                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3527                         goto err_release_rule;
3528                 }
3529
3530                 if (expr_info[i].ops->validate)
3531                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3532
3533                 expr_info[i].ops = NULL;
3534                 expr = nft_expr_next(expr);
3535         }
3536
3537         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3538                 flow = nft_flow_rule_create(net, rule);
3539                 if (IS_ERR(flow)) {
3540                         err = PTR_ERR(flow);
3541                         goto err_release_rule;
3542                 }
3543         }
3544
3545         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3546                 err = nft_delrule(&ctx, old_rule);
3547                 if (err < 0)
3548                         goto err_destroy_flow_rule;
3549
3550                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3551                 if (trans == NULL) {
3552                         err = -ENOMEM;
3553                         goto err_destroy_flow_rule;
3554                 }
3555                 list_add_tail_rcu(&rule->list, &old_rule->list);
3556         } else {
3557                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3558                 if (!trans) {
3559                         err = -ENOMEM;
3560                         goto err_destroy_flow_rule;
3561                 }
3562
3563                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3564                         if (old_rule)
3565                                 list_add_rcu(&rule->list, &old_rule->list);
3566                         else
3567                                 list_add_tail_rcu(&rule->list, &chain->rules);
3568                  } else {
3569                         if (old_rule)
3570                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3571                         else
3572                                 list_add_rcu(&rule->list, &chain->rules);
3573                 }
3574         }
3575         kvfree(expr_info);
3576         chain->use++;
3577
3578         if (flow)
3579                 nft_trans_flow_rule(trans) = flow;
3580
3581         if (nft_net->validate_state == NFT_VALIDATE_DO)
3582                 return nft_table_validate(net, table);
3583
3584         return 0;
3585
3586 err_destroy_flow_rule:
3587         if (flow)
3588                 nft_flow_rule_destroy(flow);
3589 err_release_rule:
3590         nf_tables_rule_release(&ctx, rule);
3591 err_release_expr:
3592         for (i = 0; i < n; i++) {
3593                 if (expr_info[i].ops) {
3594                         module_put(expr_info[i].ops->type->owner);
3595                         if (expr_info[i].ops->type->release_ops)
3596                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3597                 }
3598         }
3599         kvfree(expr_info);
3600
3601         return err;
3602 }
3603
3604 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3605                                              const struct nlattr *nla)
3606 {
3607         struct nftables_pernet *nft_net = nft_pernet(net);
3608         u32 id = ntohl(nla_get_be32(nla));
3609         struct nft_trans *trans;
3610
3611         list_for_each_entry(trans, &nft_net->commit_list, list) {
3612                 struct nft_rule *rule = nft_trans_rule(trans);
3613
3614                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3615                     id == nft_trans_rule_id(trans))
3616                         return rule;
3617         }
3618         return ERR_PTR(-ENOENT);
3619 }
3620
3621 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3622                              const struct nlattr * const nla[])
3623 {
3624         struct netlink_ext_ack *extack = info->extack;
3625         u8 genmask = nft_genmask_next(info->net);
3626         u8 family = info->nfmsg->nfgen_family;
3627         struct nft_chain *chain = NULL;
3628         struct net *net = info->net;
3629         struct nft_table *table;
3630         struct nft_rule *rule;
3631         struct nft_ctx ctx;
3632         int err = 0;
3633
3634         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3635                                  NETLINK_CB(skb).portid);
3636         if (IS_ERR(table)) {
3637                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3638                 return PTR_ERR(table);
3639         }
3640
3641         if (nla[NFTA_RULE_CHAIN]) {
3642                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3643                                          genmask);
3644                 if (IS_ERR(chain)) {
3645                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3646                         return PTR_ERR(chain);
3647                 }
3648                 if (nft_chain_is_bound(chain))
3649                         return -EOPNOTSUPP;
3650         }
3651
3652         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3653
3654         if (chain) {
3655                 if (nla[NFTA_RULE_HANDLE]) {
3656                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3657                         if (IS_ERR(rule)) {
3658                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3659                                 return PTR_ERR(rule);
3660                         }
3661
3662                         err = nft_delrule(&ctx, rule);
3663                 } else if (nla[NFTA_RULE_ID]) {
3664                         rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3665                         if (IS_ERR(rule)) {
3666                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3667                                 return PTR_ERR(rule);
3668                         }
3669
3670                         err = nft_delrule(&ctx, rule);
3671                 } else {
3672                         err = nft_delrule_by_chain(&ctx);
3673                 }
3674         } else {
3675                 list_for_each_entry(chain, &table->chains, list) {
3676                         if (!nft_is_active_next(net, chain))
3677                                 continue;
3678
3679                         ctx.chain = chain;
3680                         err = nft_delrule_by_chain(&ctx);
3681                         if (err < 0)
3682                                 break;
3683                 }
3684         }
3685
3686         return err;
3687 }
3688
3689 /*
3690  * Sets
3691  */
3692 static const struct nft_set_type *nft_set_types[] = {
3693         &nft_set_hash_fast_type,
3694         &nft_set_hash_type,
3695         &nft_set_rhash_type,
3696         &nft_set_bitmap_type,
3697         &nft_set_rbtree_type,
3698 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3699         &nft_set_pipapo_avx2_type,
3700 #endif
3701         &nft_set_pipapo_type,
3702 };
3703
3704 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3705                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3706                                  NFT_SET_EVAL)
3707
3708 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3709 {
3710         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3711 }
3712
3713 /*
3714  * Select a set implementation based on the data characteristics and the
3715  * given policy. The total memory use might not be known if no size is
3716  * given, in that case the amount of memory per element is used.
3717  */
3718 static const struct nft_set_ops *
3719 nft_select_set_ops(const struct nft_ctx *ctx,
3720                    const struct nlattr * const nla[],
3721                    const struct nft_set_desc *desc,
3722                    enum nft_set_policies policy)
3723 {
3724         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3725         const struct nft_set_ops *ops, *bops;
3726         struct nft_set_estimate est, best;
3727         const struct nft_set_type *type;
3728         u32 flags = 0;
3729         int i;
3730
3731         lockdep_assert_held(&nft_net->commit_mutex);
3732         lockdep_nfnl_nft_mutex_not_held();
3733
3734         if (nla[NFTA_SET_FLAGS] != NULL)
3735                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3736
3737         bops        = NULL;
3738         best.size   = ~0;
3739         best.lookup = ~0;
3740         best.space  = ~0;
3741
3742         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3743                 type = nft_set_types[i];
3744                 ops = &type->ops;
3745
3746                 if (!nft_set_ops_candidate(type, flags))
3747                         continue;
3748                 if (!ops->estimate(desc, flags, &est))
3749                         continue;
3750
3751                 switch (policy) {
3752                 case NFT_SET_POL_PERFORMANCE:
3753                         if (est.lookup < best.lookup)
3754                                 break;
3755                         if (est.lookup == best.lookup &&
3756                             est.space < best.space)
3757                                 break;
3758                         continue;
3759                 case NFT_SET_POL_MEMORY:
3760                         if (!desc->size) {
3761                                 if (est.space < best.space)
3762                                         break;
3763                                 if (est.space == best.space &&
3764                                     est.lookup < best.lookup)
3765                                         break;
3766                         } else if (est.size < best.size || !bops) {
3767                                 break;
3768                         }
3769                         continue;
3770                 default:
3771                         break;
3772                 }
3773
3774                 bops = ops;
3775                 best = est;
3776         }
3777
3778         if (bops != NULL)
3779                 return bops;
3780
3781         return ERR_PTR(-EOPNOTSUPP);
3782 }
3783
3784 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3785         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3786                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3787         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3788                                             .len = NFT_SET_MAXNAMELEN - 1 },
3789         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3790         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3791         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3792         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3793         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3794         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3795         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3796         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3797         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3798         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3799         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3800                                             .len  = NFT_USERDATA_MAXLEN },
3801         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3802         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3803         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3804         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3805 };
3806
3807 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3808         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3809         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3810 };
3811
3812 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3813                                       const struct nlattr *nla, u8 genmask)
3814 {
3815         struct nft_set *set;
3816
3817         if (nla == NULL)
3818                 return ERR_PTR(-EINVAL);
3819
3820         list_for_each_entry_rcu(set, &table->sets, list) {
3821                 if (!nla_strcmp(nla, set->name) &&
3822                     nft_active_genmask(set, genmask))
3823                         return set;
3824         }
3825         return ERR_PTR(-ENOENT);
3826 }
3827
3828 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3829                                                const struct nlattr *nla,
3830                                                u8 genmask)
3831 {
3832         struct nft_set *set;
3833
3834         list_for_each_entry(set, &table->sets, list) {
3835                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3836                     nft_active_genmask(set, genmask))
3837                         return set;
3838         }
3839         return ERR_PTR(-ENOENT);
3840 }
3841
3842 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3843                                            const struct nlattr *nla, u8 genmask)
3844 {
3845         struct nftables_pernet *nft_net = nft_pernet(net);
3846         u32 id = ntohl(nla_get_be32(nla));
3847         struct nft_trans *trans;
3848
3849         list_for_each_entry(trans, &nft_net->commit_list, list) {
3850                 if (trans->msg_type == NFT_MSG_NEWSET) {
3851                         struct nft_set *set = nft_trans_set(trans);
3852
3853                         if (id == nft_trans_set_id(trans) &&
3854                             nft_active_genmask(set, genmask))
3855                                 return set;
3856                 }
3857         }
3858         return ERR_PTR(-ENOENT);
3859 }
3860
3861 struct nft_set *nft_set_lookup_global(const struct net *net,
3862                                       const struct nft_table *table,
3863                                       const struct nlattr *nla_set_name,
3864                                       const struct nlattr *nla_set_id,
3865                                       u8 genmask)
3866 {
3867         struct nft_set *set;
3868
3869         set = nft_set_lookup(table, nla_set_name, genmask);
3870         if (IS_ERR(set)) {
3871                 if (!nla_set_id)
3872                         return set;
3873
3874                 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3875         }
3876         return set;
3877 }
3878 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3879
3880 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3881                                     const char *name)
3882 {
3883         const struct nft_set *i;
3884         const char *p;
3885         unsigned long *inuse;
3886         unsigned int n = 0, min = 0;
3887
3888         p = strchr(name, '%');
3889         if (p != NULL) {
3890                 if (p[1] != 'd' || strchr(p + 2, '%'))
3891                         return -EINVAL;
3892
3893                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3894                 if (inuse == NULL)
3895                         return -ENOMEM;
3896 cont:
3897                 list_for_each_entry(i, &ctx->table->sets, list) {
3898                         int tmp;
3899
3900                         if (!nft_is_active_next(ctx->net, set))
3901                                 continue;
3902                         if (!sscanf(i->name, name, &tmp))
3903                                 continue;
3904                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3905                                 continue;
3906
3907                         set_bit(tmp - min, inuse);
3908                 }
3909
3910                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3911                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3912                         min += BITS_PER_BYTE * PAGE_SIZE;
3913                         memset(inuse, 0, PAGE_SIZE);
3914                         goto cont;
3915                 }
3916                 free_page((unsigned long)inuse);
3917         }
3918
3919         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3920         if (!set->name)
3921                 return -ENOMEM;
3922
3923         list_for_each_entry(i, &ctx->table->sets, list) {
3924                 if (!nft_is_active_next(ctx->net, i))
3925                         continue;
3926                 if (!strcmp(set->name, i->name)) {
3927                         kfree(set->name);
3928                         set->name = NULL;
3929                         return -ENFILE;
3930                 }
3931         }
3932         return 0;
3933 }
3934
3935 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3936 {
3937         u64 ms = be64_to_cpu(nla_get_be64(nla));
3938         u64 max = (u64)(~((u64)0));
3939
3940         max = div_u64(max, NSEC_PER_MSEC);
3941         if (ms >= max)
3942                 return -ERANGE;
3943
3944         ms *= NSEC_PER_MSEC;
3945         *result = nsecs_to_jiffies64(ms);
3946         return 0;
3947 }
3948
3949 __be64 nf_jiffies64_to_msecs(u64 input)
3950 {
3951         return cpu_to_be64(jiffies64_to_msecs(input));
3952 }
3953
3954 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3955                                      const struct nft_set *set)
3956 {
3957         struct nlattr *concat, *field;
3958         int i;
3959
3960         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3961         if (!concat)
3962                 return -ENOMEM;
3963
3964         for (i = 0; i < set->field_count; i++) {
3965                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3966                 if (!field)
3967                         return -ENOMEM;
3968
3969                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3970                                  htonl(set->field_len[i])))
3971                         return -ENOMEM;
3972
3973                 nla_nest_end(skb, field);
3974         }
3975
3976         nla_nest_end(skb, concat);
3977
3978         return 0;
3979 }
3980
3981 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3982                               const struct nft_set *set, u16 event, u16 flags)
3983 {
3984         struct nlmsghdr *nlh;
3985         u32 portid = ctx->portid;
3986         struct nlattr *nest;
3987         u32 seq = ctx->seq;
3988         int i;
3989
3990         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3991         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3992                            NFNETLINK_V0, nft_base_seq(ctx->net));
3993         if (!nlh)
3994                 goto nla_put_failure;
3995
3996         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3997                 goto nla_put_failure;
3998         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3999                 goto nla_put_failure;
4000         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4001                          NFTA_SET_PAD))
4002                 goto nla_put_failure;
4003         if (set->flags != 0)
4004                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4005                         goto nla_put_failure;
4006
4007         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4008                 goto nla_put_failure;
4009         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4010                 goto nla_put_failure;
4011         if (set->flags & NFT_SET_MAP) {
4012                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4013                         goto nla_put_failure;
4014                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4015                         goto nla_put_failure;
4016         }
4017         if (set->flags & NFT_SET_OBJECT &&
4018             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4019                 goto nla_put_failure;
4020
4021         if (set->timeout &&
4022             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4023                          nf_jiffies64_to_msecs(set->timeout),
4024                          NFTA_SET_PAD))
4025                 goto nla_put_failure;
4026         if (set->gc_int &&
4027             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4028                 goto nla_put_failure;
4029
4030         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4031                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4032                         goto nla_put_failure;
4033         }
4034
4035         if (set->udata &&
4036             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4037                 goto nla_put_failure;
4038
4039         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4040         if (!nest)
4041                 goto nla_put_failure;
4042         if (set->size &&
4043             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4044                 goto nla_put_failure;
4045
4046         if (set->field_count > 1 &&
4047             nf_tables_fill_set_concat(skb, set))
4048                 goto nla_put_failure;
4049
4050         nla_nest_end(skb, nest);
4051
4052         if (set->num_exprs == 1) {
4053                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4054                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4055                         goto nla_put_failure;
4056
4057                 nla_nest_end(skb, nest);
4058         } else if (set->num_exprs > 1) {
4059                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4060                 if (nest == NULL)
4061                         goto nla_put_failure;
4062
4063                 for (i = 0; i < set->num_exprs; i++) {
4064                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4065                                           set->exprs[i]) < 0)
4066                                 goto nla_put_failure;
4067                 }
4068                 nla_nest_end(skb, nest);
4069         }
4070
4071         nlmsg_end(skb, nlh);
4072         return 0;
4073
4074 nla_put_failure:
4075         nlmsg_trim(skb, nlh);
4076         return -1;
4077 }
4078
4079 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4080                                  const struct nft_set *set, int event,
4081                                  gfp_t gfp_flags)
4082 {
4083         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4084         u32 portid = ctx->portid;
4085         struct sk_buff *skb;
4086         u16 flags = 0;
4087         int err;
4088
4089         if (!ctx->report &&
4090             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4091                 return;
4092
4093         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4094         if (skb == NULL)
4095                 goto err;
4096
4097         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4098                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4099
4100         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4101         if (err < 0) {
4102                 kfree_skb(skb);
4103                 goto err;
4104         }
4105
4106         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4107         return;
4108 err:
4109         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4110 }
4111
4112 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4113 {
4114         const struct nft_set *set;
4115         unsigned int idx, s_idx = cb->args[0];
4116         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4117         struct net *net = sock_net(skb->sk);
4118         struct nft_ctx *ctx = cb->data, ctx_set;
4119         struct nftables_pernet *nft_net;
4120
4121         if (cb->args[1])
4122                 return skb->len;
4123
4124         rcu_read_lock();
4125         nft_net = nft_pernet(net);
4126         cb->seq = nft_net->base_seq;
4127
4128         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4129                 if (ctx->family != NFPROTO_UNSPEC &&
4130                     ctx->family != table->family)
4131                         continue;
4132
4133                 if (ctx->table && ctx->table != table)
4134                         continue;
4135
4136                 if (cur_table) {
4137                         if (cur_table != table)
4138                                 continue;
4139
4140                         cur_table = NULL;
4141                 }
4142                 idx = 0;
4143                 list_for_each_entry_rcu(set, &table->sets, list) {
4144                         if (idx < s_idx)
4145                                 goto cont;
4146                         if (!nft_is_active(net, set))
4147                                 goto cont;
4148
4149                         ctx_set = *ctx;
4150                         ctx_set.table = table;
4151                         ctx_set.family = table->family;
4152
4153                         if (nf_tables_fill_set(skb, &ctx_set, set,
4154                                                NFT_MSG_NEWSET,
4155                                                NLM_F_MULTI) < 0) {
4156                                 cb->args[0] = idx;
4157                                 cb->args[2] = (unsigned long) table;
4158                                 goto done;
4159                         }
4160                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4161 cont:
4162                         idx++;
4163                 }
4164                 if (s_idx)
4165                         s_idx = 0;
4166         }
4167         cb->args[1] = 1;
4168 done:
4169         rcu_read_unlock();
4170         return skb->len;
4171 }
4172
4173 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4174 {
4175         struct nft_ctx *ctx_dump = NULL;
4176
4177         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4178         if (ctx_dump == NULL)
4179                 return -ENOMEM;
4180
4181         cb->data = ctx_dump;
4182         return 0;
4183 }
4184
4185 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4186 {
4187         kfree(cb->data);
4188         return 0;
4189 }
4190
4191 /* called with rcu_read_lock held */
4192 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4193                             const struct nlattr * const nla[])
4194 {
4195         struct netlink_ext_ack *extack = info->extack;
4196         u8 genmask = nft_genmask_cur(info->net);
4197         u8 family = info->nfmsg->nfgen_family;
4198         struct nft_table *table = NULL;
4199         struct net *net = info->net;
4200         const struct nft_set *set;
4201         struct sk_buff *skb2;
4202         struct nft_ctx ctx;
4203         int err;
4204
4205         if (nla[NFTA_SET_TABLE]) {
4206                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4207                                          genmask, 0);
4208                 if (IS_ERR(table)) {
4209                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4210                         return PTR_ERR(table);
4211                 }
4212         }
4213
4214         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4215
4216         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4217                 struct netlink_dump_control c = {
4218                         .start = nf_tables_dump_sets_start,
4219                         .dump = nf_tables_dump_sets,
4220                         .done = nf_tables_dump_sets_done,
4221                         .data = &ctx,
4222                         .module = THIS_MODULE,
4223                 };
4224
4225                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4226         }
4227
4228         /* Only accept unspec with dump */
4229         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4230                 return -EAFNOSUPPORT;
4231         if (!nla[NFTA_SET_TABLE])
4232                 return -EINVAL;
4233
4234         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4235         if (IS_ERR(set))
4236                 return PTR_ERR(set);
4237
4238         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4239         if (skb2 == NULL)
4240                 return -ENOMEM;
4241
4242         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4243         if (err < 0)
4244                 goto err_fill_set_info;
4245
4246         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4247
4248 err_fill_set_info:
4249         kfree_skb(skb2);
4250         return err;
4251 }
4252
4253 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4254         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4255 };
4256
4257 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4258                                      struct nft_set_desc *desc)
4259 {
4260         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4261         u32 len;
4262         int err;
4263
4264         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4265                 return -E2BIG;
4266
4267         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4268                                           nft_concat_policy, NULL);
4269         if (err < 0)
4270                 return err;
4271
4272         if (!tb[NFTA_SET_FIELD_LEN])
4273                 return -EINVAL;
4274
4275         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4276         if (!len || len > U8_MAX)
4277                 return -EINVAL;
4278
4279         desc->field_len[desc->field_count++] = len;
4280
4281         return 0;
4282 }
4283
4284 static int nft_set_desc_concat(struct nft_set_desc *desc,
4285                                const struct nlattr *nla)
4286 {
4287         struct nlattr *attr;
4288         u32 num_regs = 0;
4289         int rem, err, i;
4290
4291         nla_for_each_nested(attr, nla, rem) {
4292                 if (nla_type(attr) != NFTA_LIST_ELEM)
4293                         return -EINVAL;
4294
4295                 err = nft_set_desc_concat_parse(attr, desc);
4296                 if (err < 0)
4297                         return err;
4298         }
4299
4300         for (i = 0; i < desc->field_count; i++)
4301                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4302
4303         if (num_regs > NFT_REG32_COUNT)
4304                 return -E2BIG;
4305
4306         return 0;
4307 }
4308
4309 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4310                                     const struct nlattr *nla)
4311 {
4312         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4313         int err;
4314
4315         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4316                                           nft_set_desc_policy, NULL);
4317         if (err < 0)
4318                 return err;
4319
4320         if (da[NFTA_SET_DESC_SIZE] != NULL)
4321                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4322         if (da[NFTA_SET_DESC_CONCAT])
4323                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4324
4325         return err;
4326 }
4327
4328 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4329                             const struct nlattr * const nla[])
4330 {
4331         u32 ktype, dtype, flags, policy, gc_int, objtype;
4332         struct netlink_ext_ack *extack = info->extack;
4333         u8 genmask = nft_genmask_next(info->net);
4334         u8 family = info->nfmsg->nfgen_family;
4335         const struct nft_set_ops *ops;
4336         struct nft_expr *expr = NULL;
4337         struct net *net = info->net;
4338         struct nft_set_desc desc;
4339         struct nft_table *table;
4340         unsigned char *udata;
4341         struct nft_set *set;
4342         struct nft_ctx ctx;
4343         size_t alloc_size;
4344         u64 timeout;
4345         char *name;
4346         int err, i;
4347         u16 udlen;
4348         u64 size;
4349
4350         if (nla[NFTA_SET_TABLE] == NULL ||
4351             nla[NFTA_SET_NAME] == NULL ||
4352             nla[NFTA_SET_KEY_LEN] == NULL ||
4353             nla[NFTA_SET_ID] == NULL)
4354                 return -EINVAL;
4355
4356         memset(&desc, 0, sizeof(desc));
4357
4358         ktype = NFT_DATA_VALUE;
4359         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4360                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4361                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4362                         return -EINVAL;
4363         }
4364
4365         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4366         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4367                 return -EINVAL;
4368
4369         flags = 0;
4370         if (nla[NFTA_SET_FLAGS] != NULL) {
4371                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4372                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4373                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4374                               NFT_SET_MAP | NFT_SET_EVAL |
4375                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4376                         return -EOPNOTSUPP;
4377                 /* Only one of these operations is supported */
4378                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4379                              (NFT_SET_MAP | NFT_SET_OBJECT))
4380                         return -EOPNOTSUPP;
4381                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4382                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4383                         return -EOPNOTSUPP;
4384         }
4385
4386         dtype = 0;
4387         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4388                 if (!(flags & NFT_SET_MAP))
4389                         return -EINVAL;
4390
4391                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4392                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4393                     dtype != NFT_DATA_VERDICT)
4394                         return -EINVAL;
4395
4396                 if (dtype != NFT_DATA_VERDICT) {
4397                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4398                                 return -EINVAL;
4399                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4400                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4401                                 return -EINVAL;
4402                 } else
4403                         desc.dlen = sizeof(struct nft_verdict);
4404         } else if (flags & NFT_SET_MAP)
4405                 return -EINVAL;
4406
4407         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4408                 if (!(flags & NFT_SET_OBJECT))
4409                         return -EINVAL;
4410
4411                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4412                 if (objtype == NFT_OBJECT_UNSPEC ||
4413                     objtype > NFT_OBJECT_MAX)
4414                         return -EOPNOTSUPP;
4415         } else if (flags & NFT_SET_OBJECT)
4416                 return -EINVAL;
4417         else
4418                 objtype = NFT_OBJECT_UNSPEC;
4419
4420         timeout = 0;
4421         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4422                 if (!(flags & NFT_SET_TIMEOUT))
4423                         return -EINVAL;
4424
4425                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4426                 if (err)
4427                         return err;
4428         }
4429         gc_int = 0;
4430         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4431                 if (!(flags & NFT_SET_TIMEOUT))
4432                         return -EINVAL;
4433                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4434         }
4435
4436         policy = NFT_SET_POL_PERFORMANCE;
4437         if (nla[NFTA_SET_POLICY] != NULL)
4438                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4439
4440         if (nla[NFTA_SET_DESC] != NULL) {
4441                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4442                 if (err < 0)
4443                         return err;
4444         }
4445
4446         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4447                 desc.expr = true;
4448
4449         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4450                                  NETLINK_CB(skb).portid);
4451         if (IS_ERR(table)) {
4452                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4453                 return PTR_ERR(table);
4454         }
4455
4456         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4457
4458         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4459         if (IS_ERR(set)) {
4460                 if (PTR_ERR(set) != -ENOENT) {
4461                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4462                         return PTR_ERR(set);
4463                 }
4464         } else {
4465                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4466                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4467                         return -EEXIST;
4468                 }
4469                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4470                         return -EOPNOTSUPP;
4471
4472                 return 0;
4473         }
4474
4475         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4476                 return -ENOENT;
4477
4478         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4479         if (IS_ERR(ops))
4480                 return PTR_ERR(ops);
4481
4482         udlen = 0;
4483         if (nla[NFTA_SET_USERDATA])
4484                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4485
4486         size = 0;
4487         if (ops->privsize != NULL)
4488                 size = ops->privsize(nla, &desc);
4489         alloc_size = sizeof(*set) + size + udlen;
4490         if (alloc_size < size || alloc_size > INT_MAX)
4491                 return -ENOMEM;
4492         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4493         if (!set)
4494                 return -ENOMEM;
4495
4496         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4497         if (!name) {
4498                 err = -ENOMEM;
4499                 goto err_set_name;
4500         }
4501
4502         err = nf_tables_set_alloc_name(&ctx, set, name);
4503         kfree(name);
4504         if (err < 0)
4505                 goto err_set_name;
4506
4507         udata = NULL;
4508         if (udlen) {
4509                 udata = set->data + size;
4510                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4511         }
4512
4513         INIT_LIST_HEAD(&set->bindings);
4514         INIT_LIST_HEAD(&set->catchall_list);
4515         set->table = table;
4516         write_pnet(&set->net, net);
4517         set->ops = ops;
4518         set->ktype = ktype;
4519         set->klen = desc.klen;
4520         set->dtype = dtype;
4521         set->objtype = objtype;
4522         set->dlen = desc.dlen;
4523         set->flags = flags;
4524         set->size = desc.size;
4525         set->policy = policy;
4526         set->udlen = udlen;
4527         set->udata = udata;
4528         set->timeout = timeout;
4529         set->gc_int = gc_int;
4530
4531         set->field_count = desc.field_count;
4532         for (i = 0; i < desc.field_count; i++)
4533                 set->field_len[i] = desc.field_len[i];
4534
4535         err = ops->init(set, &desc, nla);
4536         if (err < 0)
4537                 goto err_set_init;
4538
4539         if (nla[NFTA_SET_EXPR]) {
4540                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4541                 if (IS_ERR(expr)) {
4542                         err = PTR_ERR(expr);
4543                         goto err_set_expr_alloc;
4544                 }
4545                 set->exprs[0] = expr;
4546                 set->num_exprs++;
4547         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4548                 struct nft_expr *expr;
4549                 struct nlattr *tmp;
4550                 int left;
4551
4552                 if (!(flags & NFT_SET_EXPR)) {
4553                         err = -EINVAL;
4554                         goto err_set_expr_alloc;
4555                 }
4556                 i = 0;
4557                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4558                         if (i == NFT_SET_EXPR_MAX) {
4559                                 err = -E2BIG;
4560                                 goto err_set_expr_alloc;
4561                         }
4562                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4563                                 err = -EINVAL;
4564                                 goto err_set_expr_alloc;
4565                         }
4566                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4567                         if (IS_ERR(expr)) {
4568                                 err = PTR_ERR(expr);
4569                                 goto err_set_expr_alloc;
4570                         }
4571                         set->exprs[i++] = expr;
4572                         set->num_exprs++;
4573                 }
4574         }
4575
4576         set->handle = nf_tables_alloc_handle(table);
4577
4578         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4579         if (err < 0)
4580                 goto err_set_expr_alloc;
4581
4582         list_add_tail_rcu(&set->list, &table->sets);
4583         table->use++;
4584         return 0;
4585
4586 err_set_expr_alloc:
4587         for (i = 0; i < set->num_exprs; i++)
4588                 nft_expr_destroy(&ctx, set->exprs[i]);
4589
4590         ops->destroy(set);
4591 err_set_init:
4592         kfree(set->name);
4593 err_set_name:
4594         kvfree(set);
4595         return err;
4596 }
4597
4598 struct nft_set_elem_catchall {
4599         struct list_head        list;
4600         struct rcu_head         rcu;
4601         void                    *elem;
4602 };
4603
4604 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4605                                      struct nft_set *set)
4606 {
4607         struct nft_set_elem_catchall *next, *catchall;
4608
4609         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4610                 list_del_rcu(&catchall->list);
4611                 nft_set_elem_destroy(set, catchall->elem, true);
4612                 kfree_rcu(catchall, rcu);
4613         }
4614 }
4615
4616 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4617 {
4618         int i;
4619
4620         if (WARN_ON(set->use > 0))
4621                 return;
4622
4623         for (i = 0; i < set->num_exprs; i++)
4624                 nft_expr_destroy(ctx, set->exprs[i]);
4625
4626         set->ops->destroy(set);
4627         nft_set_catchall_destroy(ctx, set);
4628         kfree(set->name);
4629         kvfree(set);
4630 }
4631
4632 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4633                             const struct nlattr * const nla[])
4634 {
4635         struct netlink_ext_ack *extack = info->extack;
4636         u8 genmask = nft_genmask_next(info->net);
4637         u8 family = info->nfmsg->nfgen_family;
4638         struct net *net = info->net;
4639         const struct nlattr *attr;
4640         struct nft_table *table;
4641         struct nft_set *set;
4642         struct nft_ctx ctx;
4643
4644         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4645                 return -EAFNOSUPPORT;
4646
4647         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4648                                  genmask, NETLINK_CB(skb).portid);
4649         if (IS_ERR(table)) {
4650                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4651                 return PTR_ERR(table);
4652         }
4653
4654         if (nla[NFTA_SET_HANDLE]) {
4655                 attr = nla[NFTA_SET_HANDLE];
4656                 set = nft_set_lookup_byhandle(table, attr, genmask);
4657         } else {
4658                 attr = nla[NFTA_SET_NAME];
4659                 set = nft_set_lookup(table, attr, genmask);
4660         }
4661
4662         if (IS_ERR(set)) {
4663                 NL_SET_BAD_ATTR(extack, attr);
4664                 return PTR_ERR(set);
4665         }
4666         if (set->use ||
4667             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4668              atomic_read(&set->nelems) > 0)) {
4669                 NL_SET_BAD_ATTR(extack, attr);
4670                 return -EBUSY;
4671         }
4672
4673         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4674
4675         return nft_delset(&ctx, set);
4676 }
4677
4678 static int nft_validate_register_store(const struct nft_ctx *ctx,
4679                                        enum nft_registers reg,
4680                                        const struct nft_data *data,
4681                                        enum nft_data_types type,
4682                                        unsigned int len);
4683
4684 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4685                                      struct nft_set *set,
4686                                      struct nft_set_elem *elem)
4687 {
4688         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4689         enum nft_registers dreg;
4690
4691         dreg = nft_type_to_reg(set->dtype);
4692         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4693                                            set->dtype == NFT_DATA_VERDICT ?
4694                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4695                                            set->dlen);
4696 }
4697
4698 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4699                                         struct nft_set *set,
4700                                         const struct nft_set_iter *iter,
4701                                         struct nft_set_elem *elem)
4702 {
4703         return nft_setelem_data_validate(ctx, set, elem);
4704 }
4705
4706 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4707                                        struct nft_set *set)
4708 {
4709         u8 genmask = nft_genmask_next(ctx->net);
4710         struct nft_set_elem_catchall *catchall;
4711         struct nft_set_elem elem;
4712         struct nft_set_ext *ext;
4713         int ret = 0;
4714
4715         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4716                 ext = nft_set_elem_ext(set, catchall->elem);
4717                 if (!nft_set_elem_active(ext, genmask))
4718                         continue;
4719
4720                 elem.priv = catchall->elem;
4721                 ret = nft_setelem_data_validate(ctx, set, &elem);
4722                 if (ret < 0)
4723                         break;
4724         }
4725
4726         return ret;
4727 }
4728
4729 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4730                        struct nft_set_binding *binding)
4731 {
4732         struct nft_set_binding *i;
4733         struct nft_set_iter iter;
4734
4735         if (set->use == UINT_MAX)
4736                 return -EOVERFLOW;
4737
4738         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4739                 return -EBUSY;
4740
4741         if (binding->flags & NFT_SET_MAP) {
4742                 /* If the set is already bound to the same chain all
4743                  * jumps are already validated for that chain.
4744                  */
4745                 list_for_each_entry(i, &set->bindings, list) {
4746                         if (i->flags & NFT_SET_MAP &&
4747                             i->chain == binding->chain)
4748                                 goto bind;
4749                 }
4750
4751                 iter.genmask    = nft_genmask_next(ctx->net);
4752                 iter.skip       = 0;
4753                 iter.count      = 0;
4754                 iter.err        = 0;
4755                 iter.fn         = nf_tables_bind_check_setelem;
4756
4757                 set->ops->walk(ctx, set, &iter);
4758                 if (!iter.err)
4759                         iter.err = nft_set_catchall_bind_check(ctx, set);
4760
4761                 if (iter.err < 0)
4762                         return iter.err;
4763         }
4764 bind:
4765         binding->chain = ctx->chain;
4766         list_add_tail_rcu(&binding->list, &set->bindings);
4767         nft_set_trans_bind(ctx, set);
4768         set->use++;
4769
4770         return 0;
4771 }
4772 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4773
4774 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4775                                  struct nft_set_binding *binding, bool event)
4776 {
4777         list_del_rcu(&binding->list);
4778
4779         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4780                 list_del_rcu(&set->list);
4781                 if (event)
4782                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4783                                              GFP_KERNEL);
4784         }
4785 }
4786
4787 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4788                               struct nft_set_binding *binding,
4789                               enum nft_trans_phase phase)
4790 {
4791         switch (phase) {
4792         case NFT_TRANS_PREPARE:
4793                 set->use--;
4794                 return;
4795         case NFT_TRANS_ABORT:
4796         case NFT_TRANS_RELEASE:
4797                 set->use--;
4798                 fallthrough;
4799         default:
4800                 nf_tables_unbind_set(ctx, set, binding,
4801                                      phase == NFT_TRANS_COMMIT);
4802         }
4803 }
4804 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4805
4806 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4807 {
4808         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4809                 nft_set_destroy(ctx, set);
4810 }
4811 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4812
4813 const struct nft_set_ext_type nft_set_ext_types[] = {
4814         [NFT_SET_EXT_KEY]               = {
4815                 .align  = __alignof__(u32),
4816         },
4817         [NFT_SET_EXT_DATA]              = {
4818                 .align  = __alignof__(u32),
4819         },
4820         [NFT_SET_EXT_EXPRESSIONS]       = {
4821                 .align  = __alignof__(struct nft_set_elem_expr),
4822         },
4823         [NFT_SET_EXT_OBJREF]            = {
4824                 .len    = sizeof(struct nft_object *),
4825                 .align  = __alignof__(struct nft_object *),
4826         },
4827         [NFT_SET_EXT_FLAGS]             = {
4828                 .len    = sizeof(u8),
4829                 .align  = __alignof__(u8),
4830         },
4831         [NFT_SET_EXT_TIMEOUT]           = {
4832                 .len    = sizeof(u64),
4833                 .align  = __alignof__(u64),
4834         },
4835         [NFT_SET_EXT_EXPIRATION]        = {
4836                 .len    = sizeof(u64),
4837                 .align  = __alignof__(u64),
4838         },
4839         [NFT_SET_EXT_USERDATA]          = {
4840                 .len    = sizeof(struct nft_userdata),
4841                 .align  = __alignof__(struct nft_userdata),
4842         },
4843         [NFT_SET_EXT_KEY_END]           = {
4844                 .align  = __alignof__(u32),
4845         },
4846 };
4847
4848 /*
4849  * Set elements
4850  */
4851
4852 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4853         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4854         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4855         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4856         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4857         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4858         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4859                                             .len = NFT_USERDATA_MAXLEN },
4860         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4861         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4862                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4863         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4864         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4865 };
4866
4867 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4868         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4869                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4870         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4871                                             .len = NFT_SET_MAXNAMELEN - 1 },
4872         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4873         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4874 };
4875
4876 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4877                                   const struct nft_set *set,
4878                                   const struct nft_set_ext *ext)
4879 {
4880         struct nft_set_elem_expr *elem_expr;
4881         u32 size, num_exprs = 0;
4882         struct nft_expr *expr;
4883         struct nlattr *nest;
4884
4885         elem_expr = nft_set_ext_expr(ext);
4886         nft_setelem_expr_foreach(expr, elem_expr, size)
4887                 num_exprs++;
4888
4889         if (num_exprs == 1) {
4890                 expr = nft_setelem_expr_at(elem_expr, 0);
4891                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4892                         return -1;
4893
4894                 return 0;
4895         } else if (num_exprs > 1) {
4896                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4897                 if (nest == NULL)
4898                         goto nla_put_failure;
4899
4900                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4901                         expr = nft_setelem_expr_at(elem_expr, size);
4902                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4903                                 goto nla_put_failure;
4904                 }
4905                 nla_nest_end(skb, nest);
4906         }
4907         return 0;
4908
4909 nla_put_failure:
4910         return -1;
4911 }
4912
4913 static int nf_tables_fill_setelem(struct sk_buff *skb,
4914                                   const struct nft_set *set,
4915                                   const struct nft_set_elem *elem)
4916 {
4917         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4918         unsigned char *b = skb_tail_pointer(skb);
4919         struct nlattr *nest;
4920
4921         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4922         if (nest == NULL)
4923                 goto nla_put_failure;
4924
4925         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4926             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4927                           NFT_DATA_VALUE, set->klen) < 0)
4928                 goto nla_put_failure;
4929
4930         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4931             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4932                           NFT_DATA_VALUE, set->klen) < 0)
4933                 goto nla_put_failure;
4934
4935         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4936             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4937                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4938                           set->dlen) < 0)
4939                 goto nla_put_failure;
4940
4941         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4942             nft_set_elem_expr_dump(skb, set, ext))
4943                 goto nla_put_failure;
4944
4945         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4946             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4947                            (*nft_set_ext_obj(ext))->key.name) < 0)
4948                 goto nla_put_failure;
4949
4950         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4951             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4952                          htonl(*nft_set_ext_flags(ext))))
4953                 goto nla_put_failure;
4954
4955         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4956             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4957                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4958                          NFTA_SET_ELEM_PAD))
4959                 goto nla_put_failure;
4960
4961         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4962                 u64 expires, now = get_jiffies_64();
4963
4964                 expires = *nft_set_ext_expiration(ext);
4965                 if (time_before64(now, expires))
4966                         expires -= now;
4967                 else
4968                         expires = 0;
4969
4970                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4971                                  nf_jiffies64_to_msecs(expires),
4972                                  NFTA_SET_ELEM_PAD))
4973                         goto nla_put_failure;
4974         }
4975
4976         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4977                 struct nft_userdata *udata;
4978
4979                 udata = nft_set_ext_userdata(ext);
4980                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4981                             udata->len + 1, udata->data))
4982                         goto nla_put_failure;
4983         }
4984
4985         nla_nest_end(skb, nest);
4986         return 0;
4987
4988 nla_put_failure:
4989         nlmsg_trim(skb, b);
4990         return -EMSGSIZE;
4991 }
4992
4993 struct nft_set_dump_args {
4994         const struct netlink_callback   *cb;
4995         struct nft_set_iter             iter;
4996         struct sk_buff                  *skb;
4997 };
4998
4999 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5000                                   struct nft_set *set,
5001                                   const struct nft_set_iter *iter,
5002                                   struct nft_set_elem *elem)
5003 {
5004         struct nft_set_dump_args *args;
5005
5006         args = container_of(iter, struct nft_set_dump_args, iter);
5007         return nf_tables_fill_setelem(args->skb, set, elem);
5008 }
5009
5010 struct nft_set_dump_ctx {
5011         const struct nft_set    *set;
5012         struct nft_ctx          ctx;
5013 };
5014
5015 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5016                                  const struct nft_set *set)
5017 {
5018         struct nft_set_elem_catchall *catchall;
5019         u8 genmask = nft_genmask_cur(net);
5020         struct nft_set_elem elem;
5021         struct nft_set_ext *ext;
5022         int ret = 0;
5023
5024         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5025                 ext = nft_set_elem_ext(set, catchall->elem);
5026                 if (!nft_set_elem_active(ext, genmask) ||
5027                     nft_set_elem_expired(ext))
5028                         continue;
5029
5030                 elem.priv = catchall->elem;
5031                 ret = nf_tables_fill_setelem(skb, set, &elem);
5032                 break;
5033         }
5034
5035         return ret;
5036 }
5037
5038 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5039 {
5040         struct nft_set_dump_ctx *dump_ctx = cb->data;
5041         struct net *net = sock_net(skb->sk);
5042         struct nftables_pernet *nft_net;
5043         struct nft_table *table;
5044         struct nft_set *set;
5045         struct nft_set_dump_args args;
5046         bool set_found = false;
5047         struct nlmsghdr *nlh;
5048         struct nlattr *nest;
5049         u32 portid, seq;
5050         int event;
5051
5052         rcu_read_lock();
5053         nft_net = nft_pernet(net);
5054         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5055                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5056                     dump_ctx->ctx.family != table->family)
5057                         continue;
5058
5059                 if (table != dump_ctx->ctx.table)
5060                         continue;
5061
5062                 list_for_each_entry_rcu(set, &table->sets, list) {
5063                         if (set == dump_ctx->set) {
5064                                 set_found = true;
5065                                 break;
5066                         }
5067                 }
5068                 break;
5069         }
5070
5071         if (!set_found) {
5072                 rcu_read_unlock();
5073                 return -ENOENT;
5074         }
5075
5076         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5077         portid = NETLINK_CB(cb->skb).portid;
5078         seq    = cb->nlh->nlmsg_seq;
5079
5080         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5081                            table->family, NFNETLINK_V0, nft_base_seq(net));
5082         if (!nlh)
5083                 goto nla_put_failure;
5084
5085         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5086                 goto nla_put_failure;
5087         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5088                 goto nla_put_failure;
5089
5090         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5091         if (nest == NULL)
5092                 goto nla_put_failure;
5093
5094         args.cb                 = cb;
5095         args.skb                = skb;
5096         args.iter.genmask       = nft_genmask_cur(net);
5097         args.iter.skip          = cb->args[0];
5098         args.iter.count         = 0;
5099         args.iter.err           = 0;
5100         args.iter.fn            = nf_tables_dump_setelem;
5101         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5102
5103         if (!args.iter.err && args.iter.count == cb->args[0])
5104                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5105         rcu_read_unlock();
5106
5107         nla_nest_end(skb, nest);
5108         nlmsg_end(skb, nlh);
5109
5110         if (args.iter.err && args.iter.err != -EMSGSIZE)
5111                 return args.iter.err;
5112         if (args.iter.count == cb->args[0])
5113                 return 0;
5114
5115         cb->args[0] = args.iter.count;
5116         return skb->len;
5117
5118 nla_put_failure:
5119         rcu_read_unlock();
5120         return -ENOSPC;
5121 }
5122
5123 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5124 {
5125         struct nft_set_dump_ctx *dump_ctx = cb->data;
5126
5127         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5128
5129         return cb->data ? 0 : -ENOMEM;
5130 }
5131
5132 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5133 {
5134         kfree(cb->data);
5135         return 0;
5136 }
5137
5138 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5139                                        const struct nft_ctx *ctx, u32 seq,
5140                                        u32 portid, int event, u16 flags,
5141                                        const struct nft_set *set,
5142                                        const struct nft_set_elem *elem)
5143 {
5144         struct nlmsghdr *nlh;
5145         struct nlattr *nest;
5146         int err;
5147
5148         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5149         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5150                            NFNETLINK_V0, nft_base_seq(ctx->net));
5151         if (!nlh)
5152                 goto nla_put_failure;
5153
5154         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5155                 goto nla_put_failure;
5156         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5157                 goto nla_put_failure;
5158
5159         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5160         if (nest == NULL)
5161                 goto nla_put_failure;
5162
5163         err = nf_tables_fill_setelem(skb, set, elem);
5164         if (err < 0)
5165                 goto nla_put_failure;
5166
5167         nla_nest_end(skb, nest);
5168
5169         nlmsg_end(skb, nlh);
5170         return 0;
5171
5172 nla_put_failure:
5173         nlmsg_trim(skb, nlh);
5174         return -1;
5175 }
5176
5177 static int nft_setelem_parse_flags(const struct nft_set *set,
5178                                    const struct nlattr *attr, u32 *flags)
5179 {
5180         if (attr == NULL)
5181                 return 0;
5182
5183         *flags = ntohl(nla_get_be32(attr));
5184         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5185                 return -EOPNOTSUPP;
5186         if (!(set->flags & NFT_SET_INTERVAL) &&
5187             *flags & NFT_SET_ELEM_INTERVAL_END)
5188                 return -EINVAL;
5189
5190         return 0;
5191 }
5192
5193 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5194                                  struct nft_data *key, struct nlattr *attr)
5195 {
5196         struct nft_data_desc desc;
5197         int err;
5198
5199         err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5200         if (err < 0)
5201                 return err;
5202
5203         if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5204                 nft_data_release(key, desc.type);
5205                 return -EINVAL;
5206         }
5207
5208         return 0;
5209 }
5210
5211 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5212                                   struct nft_data_desc *desc,
5213                                   struct nft_data *data,
5214                                   struct nlattr *attr)
5215 {
5216         int err;
5217
5218         err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5219         if (err < 0)
5220                 return err;
5221
5222         if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
5223                 nft_data_release(data, desc->type);
5224                 return -EINVAL;
5225         }
5226
5227         return 0;
5228 }
5229
5230 static void *nft_setelem_catchall_get(const struct net *net,
5231                                       const struct nft_set *set)
5232 {
5233         struct nft_set_elem_catchall *catchall;
5234         u8 genmask = nft_genmask_cur(net);
5235         struct nft_set_ext *ext;
5236         void *priv = NULL;
5237
5238         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5239                 ext = nft_set_elem_ext(set, catchall->elem);
5240                 if (!nft_set_elem_active(ext, genmask) ||
5241                     nft_set_elem_expired(ext))
5242                         continue;
5243
5244                 priv = catchall->elem;
5245                 break;
5246         }
5247
5248         return priv;
5249 }
5250
5251 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5252                            struct nft_set_elem *elem, u32 flags)
5253 {
5254         void *priv;
5255
5256         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5257                 priv = set->ops->get(ctx->net, set, elem, flags);
5258                 if (IS_ERR(priv))
5259                         return PTR_ERR(priv);
5260         } else {
5261                 priv = nft_setelem_catchall_get(ctx->net, set);
5262                 if (!priv)
5263                         return -ENOENT;
5264         }
5265         elem->priv = priv;
5266
5267         return 0;
5268 }
5269
5270 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5271                             const struct nlattr *attr)
5272 {
5273         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5274         struct nft_set_elem elem;
5275         struct sk_buff *skb;
5276         uint32_t flags = 0;
5277         int err;
5278
5279         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5280                                           nft_set_elem_policy, NULL);
5281         if (err < 0)
5282                 return err;
5283
5284         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5285         if (err < 0)
5286                 return err;
5287
5288         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5289                 return -EINVAL;
5290
5291         if (nla[NFTA_SET_ELEM_KEY]) {
5292                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5293                                             nla[NFTA_SET_ELEM_KEY]);
5294                 if (err < 0)
5295                         return err;
5296         }
5297
5298         if (nla[NFTA_SET_ELEM_KEY_END]) {
5299                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5300                                             nla[NFTA_SET_ELEM_KEY_END]);
5301                 if (err < 0)
5302                         return err;
5303         }
5304
5305         err = nft_setelem_get(ctx, set, &elem, flags);
5306         if (err < 0)
5307                 return err;
5308
5309         err = -ENOMEM;
5310         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5311         if (skb == NULL)
5312                 return err;
5313
5314         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5315                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5316         if (err < 0)
5317                 goto err_fill_setelem;
5318
5319         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5320
5321 err_fill_setelem:
5322         kfree_skb(skb);
5323         return err;
5324 }
5325
5326 /* called with rcu_read_lock held */
5327 static int nf_tables_getsetelem(struct sk_buff *skb,
5328                                 const struct nfnl_info *info,
5329                                 const struct nlattr * const nla[])
5330 {
5331         struct netlink_ext_ack *extack = info->extack;
5332         u8 genmask = nft_genmask_cur(info->net);
5333         u8 family = info->nfmsg->nfgen_family;
5334         struct net *net = info->net;
5335         struct nft_table *table;
5336         struct nft_set *set;
5337         struct nlattr *attr;
5338         struct nft_ctx ctx;
5339         int rem, err = 0;
5340
5341         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5342                                  genmask, NETLINK_CB(skb).portid);
5343         if (IS_ERR(table)) {
5344                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5345                 return PTR_ERR(table);
5346         }
5347
5348         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5349         if (IS_ERR(set))
5350                 return PTR_ERR(set);
5351
5352         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5353
5354         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5355                 struct netlink_dump_control c = {
5356                         .start = nf_tables_dump_set_start,
5357                         .dump = nf_tables_dump_set,
5358                         .done = nf_tables_dump_set_done,
5359                         .module = THIS_MODULE,
5360                 };
5361                 struct nft_set_dump_ctx dump_ctx = {
5362                         .set = set,
5363                         .ctx = ctx,
5364                 };
5365
5366                 c.data = &dump_ctx;
5367                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5368         }
5369
5370         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5371                 return -EINVAL;
5372
5373         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5374                 err = nft_get_set_elem(&ctx, set, attr);
5375                 if (err < 0) {
5376                         NL_SET_BAD_ATTR(extack, attr);
5377                         break;
5378                 }
5379         }
5380
5381         return err;
5382 }
5383
5384 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5385                                      const struct nft_set *set,
5386                                      const struct nft_set_elem *elem,
5387                                      int event)
5388 {
5389         struct nftables_pernet *nft_net;
5390         struct net *net = ctx->net;
5391         u32 portid = ctx->portid;
5392         struct sk_buff *skb;
5393         u16 flags = 0;
5394         int err;
5395
5396         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5397                 return;
5398
5399         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5400         if (skb == NULL)
5401                 goto err;
5402
5403         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5404                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5405
5406         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5407                                           set, elem);
5408         if (err < 0) {
5409                 kfree_skb(skb);
5410                 goto err;
5411         }
5412
5413         nft_net = nft_pernet(net);
5414         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5415         return;
5416 err:
5417         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5418 }
5419
5420 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5421                                               int msg_type,
5422                                               struct nft_set *set)
5423 {
5424         struct nft_trans *trans;
5425
5426         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5427         if (trans == NULL)
5428                 return NULL;
5429
5430         nft_trans_elem_set(trans) = set;
5431         return trans;
5432 }
5433
5434 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5435                                          const struct nft_set *set,
5436                                          const struct nlattr *attr)
5437 {
5438         struct nft_expr *expr;
5439         int err;
5440
5441         expr = nft_expr_init(ctx, attr);
5442         if (IS_ERR(expr))
5443                 return expr;
5444
5445         err = -EOPNOTSUPP;
5446         if (expr->ops->type->flags & NFT_EXPR_GC) {
5447                 if (set->flags & NFT_SET_TIMEOUT)
5448                         goto err_set_elem_expr;
5449                 if (!set->ops->gc_init)
5450                         goto err_set_elem_expr;
5451                 set->ops->gc_init(set);
5452         }
5453
5454         return expr;
5455
5456 err_set_elem_expr:
5457         nft_expr_destroy(ctx, expr);
5458         return ERR_PTR(err);
5459 }
5460
5461 void *nft_set_elem_init(const struct nft_set *set,
5462                         const struct nft_set_ext_tmpl *tmpl,
5463                         const u32 *key, const u32 *key_end,
5464                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5465 {
5466         struct nft_set_ext *ext;
5467         void *elem;
5468
5469         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5470         if (elem == NULL)
5471                 return NULL;
5472
5473         ext = nft_set_elem_ext(set, elem);
5474         nft_set_ext_init(ext, tmpl);
5475
5476         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5477                 memcpy(nft_set_ext_key(ext), key, set->klen);
5478         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5479                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5480         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5481                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5482         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5483                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5484                 if (expiration == 0)
5485                         *nft_set_ext_expiration(ext) += timeout;
5486         }
5487         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5488                 *nft_set_ext_timeout(ext) = timeout;
5489
5490         return elem;
5491 }
5492
5493 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5494                                         struct nft_expr *expr)
5495 {
5496         if (expr->ops->destroy_clone) {
5497                 expr->ops->destroy_clone(ctx, expr);
5498                 module_put(expr->ops->type->owner);
5499         } else {
5500                 nf_tables_expr_destroy(ctx, expr);
5501         }
5502 }
5503
5504 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5505                                       struct nft_set_elem_expr *elem_expr)
5506 {
5507         struct nft_expr *expr;
5508         u32 size;
5509
5510         nft_setelem_expr_foreach(expr, elem_expr, size)
5511                 __nft_set_elem_expr_destroy(ctx, expr);
5512 }
5513
5514 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5515                           bool destroy_expr)
5516 {
5517         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5518         struct nft_ctx ctx = {
5519                 .net    = read_pnet(&set->net),
5520                 .family = set->table->family,
5521         };
5522
5523         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5524         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5525                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5526         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5527                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5528
5529         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5530                 (*nft_set_ext_obj(ext))->use--;
5531         kfree(elem);
5532 }
5533 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5534
5535 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5536  * with the refcounting from the preparation phase.
5537  */
5538 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5539                                        const struct nft_set *set, void *elem)
5540 {
5541         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5542
5543         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5544                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5545
5546         kfree(elem);
5547 }
5548
5549 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5550                             struct nft_expr *expr_array[])
5551 {
5552         struct nft_expr *expr;
5553         int err, i, k;
5554
5555         for (i = 0; i < set->num_exprs; i++) {
5556                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5557                 if (!expr)
5558                         goto err_expr;
5559
5560                 err = nft_expr_clone(expr, set->exprs[i]);
5561                 if (err < 0) {
5562                         nft_expr_destroy(ctx, expr);
5563                         goto err_expr;
5564                 }
5565                 expr_array[i] = expr;
5566         }
5567
5568         return 0;
5569
5570 err_expr:
5571         for (k = i - 1; k >= 0; k--)
5572                 nft_expr_destroy(ctx, expr_array[k]);
5573
5574         return -ENOMEM;
5575 }
5576
5577 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5578                                    const struct nft_set_ext *ext,
5579                                    struct nft_expr *expr_array[],
5580                                    u32 num_exprs)
5581 {
5582         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5583         struct nft_expr *expr;
5584         int i, err;
5585
5586         for (i = 0; i < num_exprs; i++) {
5587                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5588                 err = nft_expr_clone(expr, expr_array[i]);
5589                 if (err < 0)
5590                         goto err_elem_expr_setup;
5591
5592                 elem_expr->size += expr_array[i]->ops->size;
5593                 nft_expr_destroy(ctx, expr_array[i]);
5594                 expr_array[i] = NULL;
5595         }
5596
5597         return 0;
5598
5599 err_elem_expr_setup:
5600         for (; i < num_exprs; i++) {
5601                 nft_expr_destroy(ctx, expr_array[i]);
5602                 expr_array[i] = NULL;
5603         }
5604
5605         return -ENOMEM;
5606 }
5607
5608 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5609                                             const struct nft_set *set)
5610 {
5611         struct nft_set_elem_catchall *catchall;
5612         u8 genmask = nft_genmask_cur(net);
5613         struct nft_set_ext *ext;
5614
5615         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5616                 ext = nft_set_elem_ext(set, catchall->elem);
5617                 if (nft_set_elem_active(ext, genmask) &&
5618                     !nft_set_elem_expired(ext))
5619                         return ext;
5620         }
5621
5622         return NULL;
5623 }
5624 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5625
5626 void *nft_set_catchall_gc(const struct nft_set *set)
5627 {
5628         struct nft_set_elem_catchall *catchall, *next;
5629         struct nft_set_ext *ext;
5630         void *elem = NULL;
5631
5632         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5633                 ext = nft_set_elem_ext(set, catchall->elem);
5634
5635                 if (!nft_set_elem_expired(ext) ||
5636                     nft_set_elem_mark_busy(ext))
5637                         continue;
5638
5639                 elem = catchall->elem;
5640                 list_del_rcu(&catchall->list);
5641                 kfree_rcu(catchall, rcu);
5642                 break;
5643         }
5644
5645         return elem;
5646 }
5647 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5648
5649 static int nft_setelem_catchall_insert(const struct net *net,
5650                                        struct nft_set *set,
5651                                        const struct nft_set_elem *elem,
5652                                        struct nft_set_ext **pext)
5653 {
5654         struct nft_set_elem_catchall *catchall;
5655         u8 genmask = nft_genmask_next(net);
5656         struct nft_set_ext *ext;
5657
5658         list_for_each_entry(catchall, &set->catchall_list, list) {
5659                 ext = nft_set_elem_ext(set, catchall->elem);
5660                 if (nft_set_elem_active(ext, genmask)) {
5661                         *pext = ext;
5662                         return -EEXIST;
5663                 }
5664         }
5665
5666         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5667         if (!catchall)
5668                 return -ENOMEM;
5669
5670         catchall->elem = elem->priv;
5671         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5672
5673         return 0;
5674 }
5675
5676 static int nft_setelem_insert(const struct net *net,
5677                               struct nft_set *set,
5678                               const struct nft_set_elem *elem,
5679                               struct nft_set_ext **ext, unsigned int flags)
5680 {
5681         int ret;
5682
5683         if (flags & NFT_SET_ELEM_CATCHALL)
5684                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5685         else
5686                 ret = set->ops->insert(net, set, elem, ext);
5687
5688         return ret;
5689 }
5690
5691 static bool nft_setelem_is_catchall(const struct nft_set *set,
5692                                     const struct nft_set_elem *elem)
5693 {
5694         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5695
5696         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5697             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5698                 return true;
5699
5700         return false;
5701 }
5702
5703 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5704                                  struct nft_set_elem *elem)
5705 {
5706         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5707
5708         if (nft_setelem_is_catchall(set, elem)) {
5709                 nft_set_elem_change_active(net, set, ext);
5710                 nft_set_elem_clear_busy(ext);
5711         } else {
5712                 set->ops->activate(net, set, elem);
5713         }
5714 }
5715
5716 static int nft_setelem_catchall_deactivate(const struct net *net,
5717                                            struct nft_set *set,
5718                                            struct nft_set_elem *elem)
5719 {
5720         struct nft_set_elem_catchall *catchall;
5721         struct nft_set_ext *ext;
5722
5723         list_for_each_entry(catchall, &set->catchall_list, list) {
5724                 ext = nft_set_elem_ext(set, catchall->elem);
5725                 if (!nft_is_active(net, ext) ||
5726                     nft_set_elem_mark_busy(ext))
5727                         continue;
5728
5729                 kfree(elem->priv);
5730                 elem->priv = catchall->elem;
5731                 nft_set_elem_change_active(net, set, ext);
5732                 return 0;
5733         }
5734
5735         return -ENOENT;
5736 }
5737
5738 static int __nft_setelem_deactivate(const struct net *net,
5739                                     struct nft_set *set,
5740                                     struct nft_set_elem *elem)
5741 {
5742         void *priv;
5743
5744         priv = set->ops->deactivate(net, set, elem);
5745         if (!priv)
5746                 return -ENOENT;
5747
5748         kfree(elem->priv);
5749         elem->priv = priv;
5750         set->ndeact++;
5751
5752         return 0;
5753 }
5754
5755 static int nft_setelem_deactivate(const struct net *net,
5756                                   struct nft_set *set,
5757                                   struct nft_set_elem *elem, u32 flags)
5758 {
5759         int ret;
5760
5761         if (flags & NFT_SET_ELEM_CATCHALL)
5762                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5763         else
5764                 ret = __nft_setelem_deactivate(net, set, elem);
5765
5766         return ret;
5767 }
5768
5769 static void nft_setelem_catchall_remove(const struct net *net,
5770                                         const struct nft_set *set,
5771                                         const struct nft_set_elem *elem)
5772 {
5773         struct nft_set_elem_catchall *catchall, *next;
5774
5775         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5776                 if (catchall->elem == elem->priv) {
5777                         list_del_rcu(&catchall->list);
5778                         kfree_rcu(catchall, rcu);
5779                         break;
5780                 }
5781         }
5782 }
5783
5784 static void nft_setelem_remove(const struct net *net,
5785                                const struct nft_set *set,
5786                                const struct nft_set_elem *elem)
5787 {
5788         if (nft_setelem_is_catchall(set, elem))
5789                 nft_setelem_catchall_remove(net, set, elem);
5790         else
5791                 set->ops->remove(net, set, elem);
5792 }
5793
5794 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5795                             const struct nlattr *attr, u32 nlmsg_flags)
5796 {
5797         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5798         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5799         u8 genmask = nft_genmask_next(ctx->net);
5800         u32 flags = 0, size = 0, num_exprs = 0;
5801         struct nft_set_ext_tmpl tmpl;
5802         struct nft_set_ext *ext, *ext2;
5803         struct nft_set_elem elem;
5804         struct nft_set_binding *binding;
5805         struct nft_object *obj = NULL;
5806         struct nft_userdata *udata;
5807         struct nft_data_desc desc;
5808         enum nft_registers dreg;
5809         struct nft_trans *trans;
5810         u64 timeout;
5811         u64 expiration;
5812         int err, i;
5813         u8 ulen;
5814
5815         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5816                                           nft_set_elem_policy, NULL);
5817         if (err < 0)
5818                 return err;
5819
5820         nft_set_ext_prepare(&tmpl);
5821
5822         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5823         if (err < 0)
5824                 return err;
5825
5826         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5827                 return -EINVAL;
5828
5829         if (flags != 0)
5830                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5831
5832         if (set->flags & NFT_SET_MAP) {
5833                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5834                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5835                         return -EINVAL;
5836         } else {
5837                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5838                         return -EINVAL;
5839         }
5840
5841         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5842              (nla[NFTA_SET_ELEM_DATA] ||
5843               nla[NFTA_SET_ELEM_OBJREF] ||
5844               nla[NFTA_SET_ELEM_TIMEOUT] ||
5845               nla[NFTA_SET_ELEM_EXPIRATION] ||
5846               nla[NFTA_SET_ELEM_USERDATA] ||
5847               nla[NFTA_SET_ELEM_EXPR] ||
5848               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5849                 return -EINVAL;
5850
5851         timeout = 0;
5852         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5853                 if (!(set->flags & NFT_SET_TIMEOUT))
5854                         return -EINVAL;
5855                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5856                                             &timeout);
5857                 if (err)
5858                         return err;
5859         } else if (set->flags & NFT_SET_TIMEOUT) {
5860                 timeout = set->timeout;
5861         }
5862
5863         expiration = 0;
5864         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5865                 if (!(set->flags & NFT_SET_TIMEOUT))
5866                         return -EINVAL;
5867                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5868                                             &expiration);
5869                 if (err)
5870                         return err;
5871         }
5872
5873         if (nla[NFTA_SET_ELEM_EXPR]) {
5874                 struct nft_expr *expr;
5875
5876                 if (set->num_exprs && set->num_exprs != 1)
5877                         return -EOPNOTSUPP;
5878
5879                 expr = nft_set_elem_expr_alloc(ctx, set,
5880                                                nla[NFTA_SET_ELEM_EXPR]);
5881                 if (IS_ERR(expr))
5882                         return PTR_ERR(expr);
5883
5884                 expr_array[0] = expr;
5885                 num_exprs = 1;
5886
5887                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5888                         err = -EOPNOTSUPP;
5889                         goto err_set_elem_expr;
5890                 }
5891         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5892                 struct nft_expr *expr;
5893                 struct nlattr *tmp;
5894                 int left;
5895
5896                 i = 0;
5897                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5898                         if (i == NFT_SET_EXPR_MAX ||
5899                             (set->num_exprs && set->num_exprs == i)) {
5900                                 err = -E2BIG;
5901                                 goto err_set_elem_expr;
5902                         }
5903                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5904                                 err = -EINVAL;
5905                                 goto err_set_elem_expr;
5906                         }
5907                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5908                         if (IS_ERR(expr)) {
5909                                 err = PTR_ERR(expr);
5910                                 goto err_set_elem_expr;
5911                         }
5912                         expr_array[i] = expr;
5913                         num_exprs++;
5914
5915                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5916                                 err = -EOPNOTSUPP;
5917                                 goto err_set_elem_expr;
5918                         }
5919                         i++;
5920                 }
5921                 if (set->num_exprs && set->num_exprs != i) {
5922                         err = -EOPNOTSUPP;
5923                         goto err_set_elem_expr;
5924                 }
5925         } else if (set->num_exprs > 0) {
5926                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5927                 if (err < 0)
5928                         goto err_set_elem_expr_clone;
5929
5930                 num_exprs = set->num_exprs;
5931         }
5932
5933         if (nla[NFTA_SET_ELEM_KEY]) {
5934                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5935                                             nla[NFTA_SET_ELEM_KEY]);
5936                 if (err < 0)
5937                         goto err_set_elem_expr;
5938
5939                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5940         }
5941
5942         if (nla[NFTA_SET_ELEM_KEY_END]) {
5943                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5944                                             nla[NFTA_SET_ELEM_KEY_END]);
5945                 if (err < 0)
5946                         goto err_parse_key;
5947
5948                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5949         }
5950
5951         if (timeout > 0) {
5952                 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5953                 if (timeout != set->timeout)
5954                         nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5955         }
5956
5957         if (num_exprs) {
5958                 for (i = 0; i < num_exprs; i++)
5959                         size += expr_array[i]->ops->size;
5960
5961                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5962                                        sizeof(struct nft_set_elem_expr) +
5963                                        size);
5964         }
5965
5966         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5967                 if (!(set->flags & NFT_SET_OBJECT)) {
5968                         err = -EINVAL;
5969                         goto err_parse_key_end;
5970                 }
5971                 obj = nft_obj_lookup(ctx->net, ctx->table,
5972                                      nla[NFTA_SET_ELEM_OBJREF],
5973                                      set->objtype, genmask);
5974                 if (IS_ERR(obj)) {
5975                         err = PTR_ERR(obj);
5976                         goto err_parse_key_end;
5977                 }
5978                 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5979         }
5980
5981         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5982                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5983                                              nla[NFTA_SET_ELEM_DATA]);
5984                 if (err < 0)
5985                         goto err_parse_key_end;
5986
5987                 dreg = nft_type_to_reg(set->dtype);
5988                 list_for_each_entry(binding, &set->bindings, list) {
5989                         struct nft_ctx bind_ctx = {
5990                                 .net    = ctx->net,
5991                                 .family = ctx->family,
5992                                 .table  = ctx->table,
5993                                 .chain  = (struct nft_chain *)binding->chain,
5994                         };
5995
5996                         if (!(binding->flags & NFT_SET_MAP))
5997                                 continue;
5998
5999                         err = nft_validate_register_store(&bind_ctx, dreg,
6000                                                           &elem.data.val,
6001                                                           desc.type, desc.len);
6002                         if (err < 0)
6003                                 goto err_parse_data;
6004
6005                         if (desc.type == NFT_DATA_VERDICT &&
6006                             (elem.data.val.verdict.code == NFT_GOTO ||
6007                              elem.data.val.verdict.code == NFT_JUMP))
6008                                 nft_validate_state_update(ctx->net,
6009                                                           NFT_VALIDATE_NEED);
6010                 }
6011
6012                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6013         }
6014
6015         /* The full maximum length of userdata can exceed the maximum
6016          * offset value (U8_MAX) for following extensions, therefor it
6017          * must be the last extension added.
6018          */
6019         ulen = 0;
6020         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6021                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6022                 if (ulen > 0)
6023                         nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6024                                                ulen);
6025         }
6026
6027         err = -ENOMEM;
6028         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6029                                       elem.key_end.val.data, elem.data.val.data,
6030                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6031         if (elem.priv == NULL)
6032                 goto err_parse_data;
6033
6034         ext = nft_set_elem_ext(set, elem.priv);
6035         if (flags)
6036                 *nft_set_ext_flags(ext) = flags;
6037         if (ulen > 0) {
6038                 udata = nft_set_ext_userdata(ext);
6039                 udata->len = ulen - 1;
6040                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6041         }
6042         if (obj) {
6043                 *nft_set_ext_obj(ext) = obj;
6044                 obj->use++;
6045         }
6046         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
6047         if (err < 0)
6048                 goto err_elem_expr;
6049
6050         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6051         if (trans == NULL) {
6052                 err = -ENOMEM;
6053                 goto err_elem_expr;
6054         }
6055
6056         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6057
6058         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6059         if (err) {
6060                 if (err == -EEXIST) {
6061                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6062                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6063                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6064                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6065                                 goto err_element_clash;
6066                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6067                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6068                              memcmp(nft_set_ext_data(ext),
6069                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6070                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6071                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6072                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6073                                 goto err_element_clash;
6074                         else if (!(nlmsg_flags & NLM_F_EXCL))
6075                                 err = 0;
6076                 } else if (err == -ENOTEMPTY) {
6077                         /* ENOTEMPTY reports overlapping between this element
6078                          * and an existing one.
6079                          */
6080                         err = -EEXIST;
6081                 }
6082                 goto err_element_clash;
6083         }
6084
6085         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6086             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6087                 err = -ENFILE;
6088                 goto err_set_full;
6089         }
6090
6091         nft_trans_elem(trans) = elem;
6092         nft_trans_commit_list_add_tail(ctx->net, trans);
6093         return 0;
6094
6095 err_set_full:
6096         nft_setelem_remove(ctx->net, set, &elem);
6097 err_element_clash:
6098         kfree(trans);
6099 err_elem_expr:
6100         if (obj)
6101                 obj->use--;
6102
6103         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6104 err_parse_data:
6105         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6106                 nft_data_release(&elem.data.val, desc.type);
6107 err_parse_key_end:
6108         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6109 err_parse_key:
6110         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6111 err_set_elem_expr:
6112         for (i = 0; i < num_exprs && expr_array[i]; i++)
6113                 nft_expr_destroy(ctx, expr_array[i]);
6114 err_set_elem_expr_clone:
6115         return err;
6116 }
6117
6118 static int nf_tables_newsetelem(struct sk_buff *skb,
6119                                 const struct nfnl_info *info,
6120                                 const struct nlattr * const nla[])
6121 {
6122         struct nftables_pernet *nft_net = nft_pernet(info->net);
6123         struct netlink_ext_ack *extack = info->extack;
6124         u8 genmask = nft_genmask_next(info->net);
6125         u8 family = info->nfmsg->nfgen_family;
6126         struct net *net = info->net;
6127         const struct nlattr *attr;
6128         struct nft_table *table;
6129         struct nft_set *set;
6130         struct nft_ctx ctx;
6131         int rem, err;
6132
6133         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6134                 return -EINVAL;
6135
6136         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6137                                  genmask, NETLINK_CB(skb).portid);
6138         if (IS_ERR(table)) {
6139                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6140                 return PTR_ERR(table);
6141         }
6142
6143         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6144                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6145         if (IS_ERR(set))
6146                 return PTR_ERR(set);
6147
6148         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6149                 return -EBUSY;
6150
6151         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6152
6153         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6154                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6155                 if (err < 0) {
6156                         NL_SET_BAD_ATTR(extack, attr);
6157                         return err;
6158                 }
6159         }
6160
6161         if (nft_net->validate_state == NFT_VALIDATE_DO)
6162                 return nft_table_validate(net, table);
6163
6164         return 0;
6165 }
6166
6167 /**
6168  *      nft_data_hold - hold a nft_data item
6169  *
6170  *      @data: struct nft_data to release
6171  *      @type: type of data
6172  *
6173  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6174  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6175  *      NFT_GOTO verdicts. This function must be called on active data objects
6176  *      from the second phase of the commit protocol.
6177  */
6178 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6179 {
6180         struct nft_chain *chain;
6181         struct nft_rule *rule;
6182
6183         if (type == NFT_DATA_VERDICT) {
6184                 switch (data->verdict.code) {
6185                 case NFT_JUMP:
6186                 case NFT_GOTO:
6187                         chain = data->verdict.chain;
6188                         chain->use++;
6189
6190                         if (!nft_chain_is_bound(chain))
6191                                 break;
6192
6193                         chain->table->use++;
6194                         list_for_each_entry(rule, &chain->rules, list)
6195                                 chain->use++;
6196
6197                         nft_chain_add(chain->table, chain);
6198                         break;
6199                 }
6200         }
6201 }
6202
6203 static void nft_setelem_data_activate(const struct net *net,
6204                                       const struct nft_set *set,
6205                                       struct nft_set_elem *elem)
6206 {
6207         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6208
6209         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6210                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6211         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6212                 (*nft_set_ext_obj(ext))->use++;
6213 }
6214
6215 static void nft_setelem_data_deactivate(const struct net *net,
6216                                         const struct nft_set *set,
6217                                         struct nft_set_elem *elem)
6218 {
6219         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6220
6221         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6222                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6223         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6224                 (*nft_set_ext_obj(ext))->use--;
6225 }
6226
6227 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6228                            const struct nlattr *attr)
6229 {
6230         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6231         struct nft_set_ext_tmpl tmpl;
6232         struct nft_set_elem elem;
6233         struct nft_set_ext *ext;
6234         struct nft_trans *trans;
6235         u32 flags = 0;
6236         int err;
6237
6238         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6239                                           nft_set_elem_policy, NULL);
6240         if (err < 0)
6241                 return err;
6242
6243         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6244         if (err < 0)
6245                 return err;
6246
6247         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6248                 return -EINVAL;
6249
6250         nft_set_ext_prepare(&tmpl);
6251
6252         if (flags != 0)
6253                 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6254
6255         if (nla[NFTA_SET_ELEM_KEY]) {
6256                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6257                                             nla[NFTA_SET_ELEM_KEY]);
6258                 if (err < 0)
6259                         return err;
6260
6261                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6262         }
6263
6264         if (nla[NFTA_SET_ELEM_KEY_END]) {
6265                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6266                                             nla[NFTA_SET_ELEM_KEY_END]);
6267                 if (err < 0)
6268                         return err;
6269
6270                 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6271         }
6272
6273         err = -ENOMEM;
6274         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6275                                       elem.key_end.val.data, NULL, 0, 0,
6276                                       GFP_KERNEL_ACCOUNT);
6277         if (elem.priv == NULL)
6278                 goto fail_elem;
6279
6280         ext = nft_set_elem_ext(set, elem.priv);
6281         if (flags)
6282                 *nft_set_ext_flags(ext) = flags;
6283
6284         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6285         if (trans == NULL)
6286                 goto fail_trans;
6287
6288         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6289         if (err < 0)
6290                 goto fail_ops;
6291
6292         nft_setelem_data_deactivate(ctx->net, set, &elem);
6293
6294         nft_trans_elem(trans) = elem;
6295         nft_trans_commit_list_add_tail(ctx->net, trans);
6296         return 0;
6297
6298 fail_ops:
6299         kfree(trans);
6300 fail_trans:
6301         kfree(elem.priv);
6302 fail_elem:
6303         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6304         return err;
6305 }
6306
6307 static int nft_setelem_flush(const struct nft_ctx *ctx,
6308                              struct nft_set *set,
6309                              const struct nft_set_iter *iter,
6310                              struct nft_set_elem *elem)
6311 {
6312         struct nft_trans *trans;
6313         int err;
6314
6315         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6316                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6317         if (!trans)
6318                 return -ENOMEM;
6319
6320         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6321                 err = -ENOENT;
6322                 goto err1;
6323         }
6324         set->ndeact++;
6325
6326         nft_setelem_data_deactivate(ctx->net, set, elem);
6327         nft_trans_elem_set(trans) = set;
6328         nft_trans_elem(trans) = *elem;
6329         nft_trans_commit_list_add_tail(ctx->net, trans);
6330
6331         return 0;
6332 err1:
6333         kfree(trans);
6334         return err;
6335 }
6336
6337 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6338                                     struct nft_set *set,
6339                                     struct nft_set_elem *elem)
6340 {
6341         struct nft_trans *trans;
6342
6343         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6344                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6345         if (!trans)
6346                 return -ENOMEM;
6347
6348         nft_setelem_data_deactivate(ctx->net, set, elem);
6349         nft_trans_elem_set(trans) = set;
6350         nft_trans_elem(trans) = *elem;
6351         nft_trans_commit_list_add_tail(ctx->net, trans);
6352
6353         return 0;
6354 }
6355
6356 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6357                                   struct nft_set *set)
6358 {
6359         u8 genmask = nft_genmask_next(ctx->net);
6360         struct nft_set_elem_catchall *catchall;
6361         struct nft_set_elem elem;
6362         struct nft_set_ext *ext;
6363         int ret = 0;
6364
6365         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6366                 ext = nft_set_elem_ext(set, catchall->elem);
6367                 if (!nft_set_elem_active(ext, genmask) ||
6368                     nft_set_elem_mark_busy(ext))
6369                         continue;
6370
6371                 elem.priv = catchall->elem;
6372                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6373                 if (ret < 0)
6374                         break;
6375         }
6376
6377         return ret;
6378 }
6379
6380 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6381 {
6382         struct nft_set_iter iter = {
6383                 .genmask        = genmask,
6384                 .fn             = nft_setelem_flush,
6385         };
6386
6387         set->ops->walk(ctx, set, &iter);
6388         if (!iter.err)
6389                 iter.err = nft_set_catchall_flush(ctx, set);
6390
6391         return iter.err;
6392 }
6393
6394 static int nf_tables_delsetelem(struct sk_buff *skb,
6395                                 const struct nfnl_info *info,
6396                                 const struct nlattr * const nla[])
6397 {
6398         struct netlink_ext_ack *extack = info->extack;
6399         u8 genmask = nft_genmask_next(info->net);
6400         u8 family = info->nfmsg->nfgen_family;
6401         struct net *net = info->net;
6402         const struct nlattr *attr;
6403         struct nft_table *table;
6404         struct nft_set *set;
6405         struct nft_ctx ctx;
6406         int rem, err = 0;
6407
6408         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6409                                  genmask, NETLINK_CB(skb).portid);
6410         if (IS_ERR(table)) {
6411                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6412                 return PTR_ERR(table);
6413         }
6414
6415         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6416         if (IS_ERR(set))
6417                 return PTR_ERR(set);
6418         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6419                 return -EBUSY;
6420
6421         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6422
6423         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6424                 return nft_set_flush(&ctx, set, genmask);
6425
6426         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6427                 err = nft_del_setelem(&ctx, set, attr);
6428                 if (err < 0) {
6429                         NL_SET_BAD_ATTR(extack, attr);
6430                         break;
6431                 }
6432         }
6433         return err;
6434 }
6435
6436 void nft_set_gc_batch_release(struct rcu_head *rcu)
6437 {
6438         struct nft_set_gc_batch *gcb;
6439         unsigned int i;
6440
6441         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6442         for (i = 0; i < gcb->head.cnt; i++)
6443                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6444         kfree(gcb);
6445 }
6446
6447 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6448                                                 gfp_t gfp)
6449 {
6450         struct nft_set_gc_batch *gcb;
6451
6452         gcb = kzalloc(sizeof(*gcb), gfp);
6453         if (gcb == NULL)
6454                 return gcb;
6455         gcb->head.set = set;
6456         return gcb;
6457 }
6458
6459 /*
6460  * Stateful objects
6461  */
6462
6463 /**
6464  *      nft_register_obj- register nf_tables stateful object type
6465  *      @obj_type: object type
6466  *
6467  *      Registers the object type for use with nf_tables. Returns zero on
6468  *      success or a negative errno code otherwise.
6469  */
6470 int nft_register_obj(struct nft_object_type *obj_type)
6471 {
6472         if (obj_type->type == NFT_OBJECT_UNSPEC)
6473                 return -EINVAL;
6474
6475         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6476         list_add_rcu(&obj_type->list, &nf_tables_objects);
6477         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6478         return 0;
6479 }
6480 EXPORT_SYMBOL_GPL(nft_register_obj);
6481
6482 /**
6483  *      nft_unregister_obj - unregister nf_tables object type
6484  *      @obj_type: object type
6485  *
6486  *      Unregisters the object type for use with nf_tables.
6487  */
6488 void nft_unregister_obj(struct nft_object_type *obj_type)
6489 {
6490         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6491         list_del_rcu(&obj_type->list);
6492         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6493 }
6494 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6495
6496 struct nft_object *nft_obj_lookup(const struct net *net,
6497                                   const struct nft_table *table,
6498                                   const struct nlattr *nla, u32 objtype,
6499                                   u8 genmask)
6500 {
6501         struct nft_object_hash_key k = { .table = table };
6502         char search[NFT_OBJ_MAXNAMELEN];
6503         struct rhlist_head *tmp, *list;
6504         struct nft_object *obj;
6505
6506         nla_strscpy(search, nla, sizeof(search));
6507         k.name = search;
6508
6509         WARN_ON_ONCE(!rcu_read_lock_held() &&
6510                      !lockdep_commit_lock_is_held(net));
6511
6512         rcu_read_lock();
6513         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6514         if (!list)
6515                 goto out;
6516
6517         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6518                 if (objtype == obj->ops->type->type &&
6519                     nft_active_genmask(obj, genmask)) {
6520                         rcu_read_unlock();
6521                         return obj;
6522                 }
6523         }
6524 out:
6525         rcu_read_unlock();
6526         return ERR_PTR(-ENOENT);
6527 }
6528 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6529
6530 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6531                                                   const struct nlattr *nla,
6532                                                   u32 objtype, u8 genmask)
6533 {
6534         struct nft_object *obj;
6535
6536         list_for_each_entry(obj, &table->objects, list) {
6537                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6538                     objtype == obj->ops->type->type &&
6539                     nft_active_genmask(obj, genmask))
6540                         return obj;
6541         }
6542         return ERR_PTR(-ENOENT);
6543 }
6544
6545 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6546         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6547                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6548         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6549                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6550         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6551         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6552         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6553         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6554                                     .len = NFT_USERDATA_MAXLEN },
6555 };
6556
6557 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6558                                        const struct nft_object_type *type,
6559                                        const struct nlattr *attr)
6560 {
6561         struct nlattr **tb;
6562         const struct nft_object_ops *ops;
6563         struct nft_object *obj;
6564         int err = -ENOMEM;
6565
6566         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6567         if (!tb)
6568                 goto err1;
6569
6570         if (attr) {
6571                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6572                                                   type->policy, NULL);
6573                 if (err < 0)
6574                         goto err2;
6575         } else {
6576                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6577         }
6578
6579         if (type->select_ops) {
6580                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6581                 if (IS_ERR(ops)) {
6582                         err = PTR_ERR(ops);
6583                         goto err2;
6584                 }
6585         } else {
6586                 ops = type->ops;
6587         }
6588
6589         err = -ENOMEM;
6590         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6591         if (!obj)
6592                 goto err2;
6593
6594         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6595         if (err < 0)
6596                 goto err3;
6597
6598         obj->ops = ops;
6599
6600         kfree(tb);
6601         return obj;
6602 err3:
6603         kfree(obj);
6604 err2:
6605         kfree(tb);
6606 err1:
6607         return ERR_PTR(err);
6608 }
6609
6610 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6611                            struct nft_object *obj, bool reset)
6612 {
6613         struct nlattr *nest;
6614
6615         nest = nla_nest_start_noflag(skb, attr);
6616         if (!nest)
6617                 goto nla_put_failure;
6618         if (obj->ops->dump(skb, obj, reset) < 0)
6619                 goto nla_put_failure;
6620         nla_nest_end(skb, nest);
6621         return 0;
6622
6623 nla_put_failure:
6624         return -1;
6625 }
6626
6627 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6628 {
6629         const struct nft_object_type *type;
6630
6631         list_for_each_entry(type, &nf_tables_objects, list) {
6632                 if (objtype == type->type)
6633                         return type;
6634         }
6635         return NULL;
6636 }
6637
6638 static const struct nft_object_type *
6639 nft_obj_type_get(struct net *net, u32 objtype)
6640 {
6641         const struct nft_object_type *type;
6642
6643         type = __nft_obj_type_get(objtype);
6644         if (type != NULL && try_module_get(type->owner))
6645                 return type;
6646
6647         lockdep_nfnl_nft_mutex_not_held();
6648 #ifdef CONFIG_MODULES
6649         if (type == NULL) {
6650                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6651                         return ERR_PTR(-EAGAIN);
6652         }
6653 #endif
6654         return ERR_PTR(-ENOENT);
6655 }
6656
6657 static int nf_tables_updobj(const struct nft_ctx *ctx,
6658                             const struct nft_object_type *type,
6659                             const struct nlattr *attr,
6660                             struct nft_object *obj)
6661 {
6662         struct nft_object *newobj;
6663         struct nft_trans *trans;
6664         int err = -ENOMEM;
6665
6666         if (!try_module_get(type->owner))
6667                 return -ENOENT;
6668
6669         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6670                                 sizeof(struct nft_trans_obj));
6671         if (!trans)
6672                 goto err_trans;
6673
6674         newobj = nft_obj_init(ctx, type, attr);
6675         if (IS_ERR(newobj)) {
6676                 err = PTR_ERR(newobj);
6677                 goto err_free_trans;
6678         }
6679
6680         nft_trans_obj(trans) = obj;
6681         nft_trans_obj_update(trans) = true;
6682         nft_trans_obj_newobj(trans) = newobj;
6683         nft_trans_commit_list_add_tail(ctx->net, trans);
6684
6685         return 0;
6686
6687 err_free_trans:
6688         kfree(trans);
6689 err_trans:
6690         module_put(type->owner);
6691         return err;
6692 }
6693
6694 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6695                             const struct nlattr * const nla[])
6696 {
6697         struct netlink_ext_ack *extack = info->extack;
6698         u8 genmask = nft_genmask_next(info->net);
6699         u8 family = info->nfmsg->nfgen_family;
6700         const struct nft_object_type *type;
6701         struct net *net = info->net;
6702         struct nft_table *table;
6703         struct nft_object *obj;
6704         struct nft_ctx ctx;
6705         u32 objtype;
6706         int err;
6707
6708         if (!nla[NFTA_OBJ_TYPE] ||
6709             !nla[NFTA_OBJ_NAME] ||
6710             !nla[NFTA_OBJ_DATA])
6711                 return -EINVAL;
6712
6713         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6714                                  NETLINK_CB(skb).portid);
6715         if (IS_ERR(table)) {
6716                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6717                 return PTR_ERR(table);
6718         }
6719
6720         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6721         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6722         if (IS_ERR(obj)) {
6723                 err = PTR_ERR(obj);
6724                 if (err != -ENOENT) {
6725                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6726                         return err;
6727                 }
6728         } else {
6729                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6730                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6731                         return -EEXIST;
6732                 }
6733                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6734                         return -EOPNOTSUPP;
6735
6736                 type = __nft_obj_type_get(objtype);
6737                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6738
6739                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6740         }
6741
6742         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6743
6744         type = nft_obj_type_get(net, objtype);
6745         if (IS_ERR(type))
6746                 return PTR_ERR(type);
6747
6748         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6749         if (IS_ERR(obj)) {
6750                 err = PTR_ERR(obj);
6751                 goto err_init;
6752         }
6753         obj->key.table = table;
6754         obj->handle = nf_tables_alloc_handle(table);
6755
6756         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6757         if (!obj->key.name) {
6758                 err = -ENOMEM;
6759                 goto err_strdup;
6760         }
6761
6762         if (nla[NFTA_OBJ_USERDATA]) {
6763                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6764                 if (obj->udata == NULL)
6765                         goto err_userdata;
6766
6767                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6768         }
6769
6770         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6771         if (err < 0)
6772                 goto err_trans;
6773
6774         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6775                               nft_objname_ht_params);
6776         if (err < 0)
6777                 goto err_obj_ht;
6778
6779         list_add_tail_rcu(&obj->list, &table->objects);
6780         table->use++;
6781         return 0;
6782 err_obj_ht:
6783         /* queued in transaction log */
6784         INIT_LIST_HEAD(&obj->list);
6785         return err;
6786 err_trans:
6787         kfree(obj->udata);
6788 err_userdata:
6789         kfree(obj->key.name);
6790 err_strdup:
6791         if (obj->ops->destroy)
6792                 obj->ops->destroy(&ctx, obj);
6793         kfree(obj);
6794 err_init:
6795         module_put(type->owner);
6796         return err;
6797 }
6798
6799 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6800                                    u32 portid, u32 seq, int event, u32 flags,
6801                                    int family, const struct nft_table *table,
6802                                    struct nft_object *obj, bool reset)
6803 {
6804         struct nlmsghdr *nlh;
6805
6806         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6807         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6808                            NFNETLINK_V0, nft_base_seq(net));
6809         if (!nlh)
6810                 goto nla_put_failure;
6811
6812         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6813             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6814             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6815             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6816             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6817             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6818                          NFTA_OBJ_PAD))
6819                 goto nla_put_failure;
6820
6821         if (obj->udata &&
6822             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6823                 goto nla_put_failure;
6824
6825         nlmsg_end(skb, nlh);
6826         return 0;
6827
6828 nla_put_failure:
6829         nlmsg_trim(skb, nlh);
6830         return -1;
6831 }
6832
6833 struct nft_obj_filter {
6834         char            *table;
6835         u32             type;
6836 };
6837
6838 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6839 {
6840         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6841         const struct nft_table *table;
6842         unsigned int idx = 0, s_idx = cb->args[0];
6843         struct nft_obj_filter *filter = cb->data;
6844         struct net *net = sock_net(skb->sk);
6845         int family = nfmsg->nfgen_family;
6846         struct nftables_pernet *nft_net;
6847         struct nft_object *obj;
6848         bool reset = false;
6849
6850         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6851                 reset = true;
6852
6853         rcu_read_lock();
6854         nft_net = nft_pernet(net);
6855         cb->seq = nft_net->base_seq;
6856
6857         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6858                 if (family != NFPROTO_UNSPEC && family != table->family)
6859                         continue;
6860
6861                 list_for_each_entry_rcu(obj, &table->objects, list) {
6862                         if (!nft_is_active(net, obj))
6863                                 goto cont;
6864                         if (idx < s_idx)
6865                                 goto cont;
6866                         if (idx > s_idx)
6867                                 memset(&cb->args[1], 0,
6868                                        sizeof(cb->args) - sizeof(cb->args[0]));
6869                         if (filter && filter->table &&
6870                             strcmp(filter->table, table->name))
6871                                 goto cont;
6872                         if (filter &&
6873                             filter->type != NFT_OBJECT_UNSPEC &&
6874                             obj->ops->type->type != filter->type)
6875                                 goto cont;
6876                         if (reset) {
6877                                 char *buf = kasprintf(GFP_ATOMIC,
6878                                                       "%s:%u",
6879                                                       table->name,
6880                                                       nft_net->base_seq);
6881
6882                                 audit_log_nfcfg(buf,
6883                                                 family,
6884                                                 obj->handle,
6885                                                 AUDIT_NFT_OP_OBJ_RESET,
6886                                                 GFP_ATOMIC);
6887                                 kfree(buf);
6888                         }
6889
6890                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6891                                                     cb->nlh->nlmsg_seq,
6892                                                     NFT_MSG_NEWOBJ,
6893                                                     NLM_F_MULTI | NLM_F_APPEND,
6894                                                     table->family, table,
6895                                                     obj, reset) < 0)
6896                                 goto done;
6897
6898                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6899 cont:
6900                         idx++;
6901                 }
6902         }
6903 done:
6904         rcu_read_unlock();
6905
6906         cb->args[0] = idx;
6907         return skb->len;
6908 }
6909
6910 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6911 {
6912         const struct nlattr * const *nla = cb->data;
6913         struct nft_obj_filter *filter = NULL;
6914
6915         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6916                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6917                 if (!filter)
6918                         return -ENOMEM;
6919
6920                 if (nla[NFTA_OBJ_TABLE]) {
6921                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6922                         if (!filter->table) {
6923                                 kfree(filter);
6924                                 return -ENOMEM;
6925                         }
6926                 }
6927
6928                 if (nla[NFTA_OBJ_TYPE])
6929                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6930         }
6931
6932         cb->data = filter;
6933         return 0;
6934 }
6935
6936 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6937 {
6938         struct nft_obj_filter *filter = cb->data;
6939
6940         if (filter) {
6941                 kfree(filter->table);
6942                 kfree(filter);
6943         }
6944
6945         return 0;
6946 }
6947
6948 /* called with rcu_read_lock held */
6949 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6950                             const struct nlattr * const nla[])
6951 {
6952         struct netlink_ext_ack *extack = info->extack;
6953         u8 genmask = nft_genmask_cur(info->net);
6954         u8 family = info->nfmsg->nfgen_family;
6955         const struct nft_table *table;
6956         struct net *net = info->net;
6957         struct nft_object *obj;
6958         struct sk_buff *skb2;
6959         bool reset = false;
6960         u32 objtype;
6961         int err;
6962
6963         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6964                 struct netlink_dump_control c = {
6965                         .start = nf_tables_dump_obj_start,
6966                         .dump = nf_tables_dump_obj,
6967                         .done = nf_tables_dump_obj_done,
6968                         .module = THIS_MODULE,
6969                         .data = (void *)nla,
6970                 };
6971
6972                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6973         }
6974
6975         if (!nla[NFTA_OBJ_NAME] ||
6976             !nla[NFTA_OBJ_TYPE])
6977                 return -EINVAL;
6978
6979         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6980         if (IS_ERR(table)) {
6981                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6982                 return PTR_ERR(table);
6983         }
6984
6985         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6986         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6987         if (IS_ERR(obj)) {
6988                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6989                 return PTR_ERR(obj);
6990         }
6991
6992         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6993         if (!skb2)
6994                 return -ENOMEM;
6995
6996         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6997                 reset = true;
6998
6999         if (reset) {
7000                 const struct nftables_pernet *nft_net;
7001                 char *buf;
7002
7003                 nft_net = nft_pernet(net);
7004                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7005
7006                 audit_log_nfcfg(buf,
7007                                 family,
7008                                 obj->handle,
7009                                 AUDIT_NFT_OP_OBJ_RESET,
7010                                 GFP_ATOMIC);
7011                 kfree(buf);
7012         }
7013
7014         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7015                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7016                                       family, table, obj, reset);
7017         if (err < 0)
7018                 goto err_fill_obj_info;
7019
7020         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7021
7022 err_fill_obj_info:
7023         kfree_skb(skb2);
7024         return err;
7025 }
7026
7027 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7028 {
7029         if (obj->ops->destroy)
7030                 obj->ops->destroy(ctx, obj);
7031
7032         module_put(obj->ops->type->owner);
7033         kfree(obj->key.name);
7034         kfree(obj->udata);
7035         kfree(obj);
7036 }
7037
7038 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7039                             const struct nlattr * const nla[])
7040 {
7041         struct netlink_ext_ack *extack = info->extack;
7042         u8 genmask = nft_genmask_next(info->net);
7043         u8 family = info->nfmsg->nfgen_family;
7044         struct net *net = info->net;
7045         const struct nlattr *attr;
7046         struct nft_table *table;
7047         struct nft_object *obj;
7048         struct nft_ctx ctx;
7049         u32 objtype;
7050
7051         if (!nla[NFTA_OBJ_TYPE] ||
7052             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7053                 return -EINVAL;
7054
7055         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7056                                  NETLINK_CB(skb).portid);
7057         if (IS_ERR(table)) {
7058                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7059                 return PTR_ERR(table);
7060         }
7061
7062         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7063         if (nla[NFTA_OBJ_HANDLE]) {
7064                 attr = nla[NFTA_OBJ_HANDLE];
7065                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7066         } else {
7067                 attr = nla[NFTA_OBJ_NAME];
7068                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7069         }
7070
7071         if (IS_ERR(obj)) {
7072                 NL_SET_BAD_ATTR(extack, attr);
7073                 return PTR_ERR(obj);
7074         }
7075         if (obj->use > 0) {
7076                 NL_SET_BAD_ATTR(extack, attr);
7077                 return -EBUSY;
7078         }
7079
7080         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7081
7082         return nft_delobj(&ctx, obj);
7083 }
7084
7085 void nft_obj_notify(struct net *net, const struct nft_table *table,
7086                     struct nft_object *obj, u32 portid, u32 seq, int event,
7087                     u16 flags, int family, int report, gfp_t gfp)
7088 {
7089         struct nftables_pernet *nft_net = nft_pernet(net);
7090         struct sk_buff *skb;
7091         int err;
7092         char *buf = kasprintf(gfp, "%s:%u",
7093                               table->name, nft_net->base_seq);
7094
7095         audit_log_nfcfg(buf,
7096                         family,
7097                         obj->handle,
7098                         event == NFT_MSG_NEWOBJ ?
7099                                  AUDIT_NFT_OP_OBJ_REGISTER :
7100                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7101                         gfp);
7102         kfree(buf);
7103
7104         if (!report &&
7105             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7106                 return;
7107
7108         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7109         if (skb == NULL)
7110                 goto err;
7111
7112         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7113                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7114                                       family, table, obj, false);
7115         if (err < 0) {
7116                 kfree_skb(skb);
7117                 goto err;
7118         }
7119
7120         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7121         return;
7122 err:
7123         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7124 }
7125 EXPORT_SYMBOL_GPL(nft_obj_notify);
7126
7127 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7128                                  struct nft_object *obj, int event)
7129 {
7130         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7131                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7132 }
7133
7134 /*
7135  * Flow tables
7136  */
7137 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7138 {
7139         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7140         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7141         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7142 }
7143 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7144
7145 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7146 {
7147         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7148         list_del_rcu(&type->list);
7149         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7150 }
7151 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7152
7153 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7154         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7155                                             .len = NFT_NAME_MAXLEN - 1 },
7156         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7157                                             .len = NFT_NAME_MAXLEN - 1 },
7158         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7159         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7160         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7161 };
7162
7163 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7164                                            const struct nlattr *nla, u8 genmask)
7165 {
7166         struct nft_flowtable *flowtable;
7167
7168         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7169                 if (!nla_strcmp(nla, flowtable->name) &&
7170                     nft_active_genmask(flowtable, genmask))
7171                         return flowtable;
7172         }
7173         return ERR_PTR(-ENOENT);
7174 }
7175 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7176
7177 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7178                                     struct nft_flowtable *flowtable,
7179                                     enum nft_trans_phase phase)
7180 {
7181         switch (phase) {
7182         case NFT_TRANS_PREPARE:
7183         case NFT_TRANS_ABORT:
7184         case NFT_TRANS_RELEASE:
7185                 flowtable->use--;
7186                 fallthrough;
7187         default:
7188                 return;
7189         }
7190 }
7191 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7192
7193 static struct nft_flowtable *
7194 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7195                               const struct nlattr *nla, u8 genmask)
7196 {
7197        struct nft_flowtable *flowtable;
7198
7199        list_for_each_entry(flowtable, &table->flowtables, list) {
7200                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7201                    nft_active_genmask(flowtable, genmask))
7202                        return flowtable;
7203        }
7204        return ERR_PTR(-ENOENT);
7205 }
7206
7207 struct nft_flowtable_hook {
7208         u32                     num;
7209         int                     priority;
7210         struct list_head        list;
7211 };
7212
7213 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7214         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7215         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7216         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7217 };
7218
7219 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7220                                     const struct nlattr *attr,
7221                                     struct nft_flowtable_hook *flowtable_hook,
7222                                     struct nft_flowtable *flowtable, bool add)
7223 {
7224         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7225         struct nft_hook *hook;
7226         int hooknum, priority;
7227         int err;
7228
7229         INIT_LIST_HEAD(&flowtable_hook->list);
7230
7231         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7232                                           nft_flowtable_hook_policy, NULL);
7233         if (err < 0)
7234                 return err;
7235
7236         if (add) {
7237                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7238                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7239                         return -EINVAL;
7240
7241                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7242                 if (hooknum != NF_NETDEV_INGRESS)
7243                         return -EOPNOTSUPP;
7244
7245                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7246
7247                 flowtable_hook->priority        = priority;
7248                 flowtable_hook->num             = hooknum;
7249         } else {
7250                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7251                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7252                         if (hooknum != flowtable->hooknum)
7253                                 return -EOPNOTSUPP;
7254                 }
7255
7256                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7257                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7258                         if (priority != flowtable->data.priority)
7259                                 return -EOPNOTSUPP;
7260                 }
7261
7262                 flowtable_hook->priority        = flowtable->data.priority;
7263                 flowtable_hook->num             = flowtable->hooknum;
7264         }
7265
7266         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7267                 err = nf_tables_parse_netdev_hooks(ctx->net,
7268                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7269                                                    &flowtable_hook->list);
7270                 if (err < 0)
7271                         return err;
7272         }
7273
7274         list_for_each_entry(hook, &flowtable_hook->list, list) {
7275                 hook->ops.pf            = NFPROTO_NETDEV;
7276                 hook->ops.hooknum       = flowtable_hook->num;
7277                 hook->ops.priority      = flowtable_hook->priority;
7278                 hook->ops.priv          = &flowtable->data;
7279                 hook->ops.hook          = flowtable->data.type->hook;
7280         }
7281
7282         return err;
7283 }
7284
7285 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7286 {
7287         const struct nf_flowtable_type *type;
7288
7289         list_for_each_entry(type, &nf_tables_flowtables, list) {
7290                 if (family == type->family)
7291                         return type;
7292         }
7293         return NULL;
7294 }
7295
7296 static const struct nf_flowtable_type *
7297 nft_flowtable_type_get(struct net *net, u8 family)
7298 {
7299         const struct nf_flowtable_type *type;
7300
7301         type = __nft_flowtable_type_get(family);
7302         if (type != NULL && try_module_get(type->owner))
7303                 return type;
7304
7305         lockdep_nfnl_nft_mutex_not_held();
7306 #ifdef CONFIG_MODULES
7307         if (type == NULL) {
7308                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7309                         return ERR_PTR(-EAGAIN);
7310         }
7311 #endif
7312         return ERR_PTR(-ENOENT);
7313 }
7314
7315 /* Only called from error and netdev event paths. */
7316 static void nft_unregister_flowtable_hook(struct net *net,
7317                                           struct nft_flowtable *flowtable,
7318                                           struct nft_hook *hook)
7319 {
7320         nf_unregister_net_hook(net, &hook->ops);
7321         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7322                                     FLOW_BLOCK_UNBIND);
7323 }
7324
7325 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7326                                                  struct list_head *hook_list,
7327                                                  bool release_netdev)
7328 {
7329         struct nft_hook *hook, *next;
7330
7331         list_for_each_entry_safe(hook, next, hook_list, list) {
7332                 nf_unregister_net_hook(net, &hook->ops);
7333                 if (release_netdev) {
7334                         list_del(&hook->list);
7335                         kfree_rcu(hook, rcu);
7336                 }
7337         }
7338 }
7339
7340 static void nft_unregister_flowtable_net_hooks(struct net *net,
7341                                                struct list_head *hook_list)
7342 {
7343         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7344 }
7345
7346 static int nft_register_flowtable_net_hooks(struct net *net,
7347                                             struct nft_table *table,
7348                                             struct list_head *hook_list,
7349                                             struct nft_flowtable *flowtable)
7350 {
7351         struct nft_hook *hook, *hook2, *next;
7352         struct nft_flowtable *ft;
7353         int err, i = 0;
7354
7355         list_for_each_entry(hook, hook_list, list) {
7356                 list_for_each_entry(ft, &table->flowtables, list) {
7357                         if (!nft_is_active_next(net, ft))
7358                                 continue;
7359
7360                         list_for_each_entry(hook2, &ft->hook_list, list) {
7361                                 if (hook->ops.dev == hook2->ops.dev &&
7362                                     hook->ops.pf == hook2->ops.pf) {
7363                                         err = -EEXIST;
7364                                         goto err_unregister_net_hooks;
7365                                 }
7366                         }
7367                 }
7368
7369                 err = flowtable->data.type->setup(&flowtable->data,
7370                                                   hook->ops.dev,
7371                                                   FLOW_BLOCK_BIND);
7372                 if (err < 0)
7373                         goto err_unregister_net_hooks;
7374
7375                 err = nf_register_net_hook(net, &hook->ops);
7376                 if (err < 0) {
7377                         flowtable->data.type->setup(&flowtable->data,
7378                                                     hook->ops.dev,
7379                                                     FLOW_BLOCK_UNBIND);
7380                         goto err_unregister_net_hooks;
7381                 }
7382
7383                 i++;
7384         }
7385
7386         return 0;
7387
7388 err_unregister_net_hooks:
7389         list_for_each_entry_safe(hook, next, hook_list, list) {
7390                 if (i-- <= 0)
7391                         break;
7392
7393                 nft_unregister_flowtable_hook(net, flowtable, hook);
7394                 list_del_rcu(&hook->list);
7395                 kfree_rcu(hook, rcu);
7396         }
7397
7398         return err;
7399 }
7400
7401 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7402 {
7403         struct nft_hook *hook, *next;
7404
7405         list_for_each_entry_safe(hook, next, hook_list, list) {
7406                 list_del_rcu(&hook->list);
7407                 kfree_rcu(hook, rcu);
7408         }
7409 }
7410
7411 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7412                                 struct nft_flowtable *flowtable)
7413 {
7414         const struct nlattr * const *nla = ctx->nla;
7415         struct nft_flowtable_hook flowtable_hook;
7416         struct nft_hook *hook, *next;
7417         struct nft_trans *trans;
7418         bool unregister = false;
7419         u32 flags;
7420         int err;
7421
7422         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7423                                        &flowtable_hook, flowtable, false);
7424         if (err < 0)
7425                 return err;
7426
7427         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7428                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7429                         list_del(&hook->list);
7430                         kfree(hook);
7431                 }
7432         }
7433
7434         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7435                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7436                 if (flags & ~NFT_FLOWTABLE_MASK) {
7437                         err = -EOPNOTSUPP;
7438                         goto err_flowtable_update_hook;
7439                 }
7440                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7441                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7442                         err = -EOPNOTSUPP;
7443                         goto err_flowtable_update_hook;
7444                 }
7445         } else {
7446                 flags = flowtable->data.flags;
7447         }
7448
7449         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7450                                                &flowtable_hook.list, flowtable);
7451         if (err < 0)
7452                 goto err_flowtable_update_hook;
7453
7454         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7455                                 sizeof(struct nft_trans_flowtable));
7456         if (!trans) {
7457                 unregister = true;
7458                 err = -ENOMEM;
7459                 goto err_flowtable_update_hook;
7460         }
7461
7462         nft_trans_flowtable_flags(trans) = flags;
7463         nft_trans_flowtable(trans) = flowtable;
7464         nft_trans_flowtable_update(trans) = true;
7465         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7466         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7467
7468         nft_trans_commit_list_add_tail(ctx->net, trans);
7469
7470         return 0;
7471
7472 err_flowtable_update_hook:
7473         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7474                 if (unregister)
7475                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7476                 list_del_rcu(&hook->list);
7477                 kfree_rcu(hook, rcu);
7478         }
7479
7480         return err;
7481
7482 }
7483
7484 static int nf_tables_newflowtable(struct sk_buff *skb,
7485                                   const struct nfnl_info *info,
7486                                   const struct nlattr * const nla[])
7487 {
7488         struct netlink_ext_ack *extack = info->extack;
7489         struct nft_flowtable_hook flowtable_hook;
7490         u8 genmask = nft_genmask_next(info->net);
7491         u8 family = info->nfmsg->nfgen_family;
7492         const struct nf_flowtable_type *type;
7493         struct nft_flowtable *flowtable;
7494         struct nft_hook *hook, *next;
7495         struct net *net = info->net;
7496         struct nft_table *table;
7497         struct nft_ctx ctx;
7498         int err;
7499
7500         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7501             !nla[NFTA_FLOWTABLE_NAME] ||
7502             !nla[NFTA_FLOWTABLE_HOOK])
7503                 return -EINVAL;
7504
7505         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7506                                  genmask, NETLINK_CB(skb).portid);
7507         if (IS_ERR(table)) {
7508                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7509                 return PTR_ERR(table);
7510         }
7511
7512         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7513                                          genmask);
7514         if (IS_ERR(flowtable)) {
7515                 err = PTR_ERR(flowtable);
7516                 if (err != -ENOENT) {
7517                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7518                         return err;
7519                 }
7520         } else {
7521                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7522                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7523                         return -EEXIST;
7524                 }
7525
7526                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7527
7528                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7529         }
7530
7531         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7532
7533         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7534         if (!flowtable)
7535                 return -ENOMEM;
7536
7537         flowtable->table = table;
7538         flowtable->handle = nf_tables_alloc_handle(table);
7539         INIT_LIST_HEAD(&flowtable->hook_list);
7540
7541         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7542         if (!flowtable->name) {
7543                 err = -ENOMEM;
7544                 goto err1;
7545         }
7546
7547         type = nft_flowtable_type_get(net, family);
7548         if (IS_ERR(type)) {
7549                 err = PTR_ERR(type);
7550                 goto err2;
7551         }
7552
7553         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7554                 flowtable->data.flags =
7555                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7556                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7557                         err = -EOPNOTSUPP;
7558                         goto err3;
7559                 }
7560         }
7561
7562         write_pnet(&flowtable->data.net, net);
7563         flowtable->data.type = type;
7564         err = type->init(&flowtable->data);
7565         if (err < 0)
7566                 goto err3;
7567
7568         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7569                                        &flowtable_hook, flowtable, true);
7570         if (err < 0)
7571                 goto err4;
7572
7573         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7574         flowtable->data.priority = flowtable_hook.priority;
7575         flowtable->hooknum = flowtable_hook.num;
7576
7577         err = nft_register_flowtable_net_hooks(ctx.net, table,
7578                                                &flowtable->hook_list,
7579                                                flowtable);
7580         if (err < 0) {
7581                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7582                 goto err4;
7583         }
7584
7585         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7586         if (err < 0)
7587                 goto err5;
7588
7589         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7590         table->use++;
7591
7592         return 0;
7593 err5:
7594         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7595                 nft_unregister_flowtable_hook(net, flowtable, hook);
7596                 list_del_rcu(&hook->list);
7597                 kfree_rcu(hook, rcu);
7598         }
7599 err4:
7600         flowtable->data.type->free(&flowtable->data);
7601 err3:
7602         module_put(type->owner);
7603 err2:
7604         kfree(flowtable->name);
7605 err1:
7606         kfree(flowtable);
7607         return err;
7608 }
7609
7610 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7611 {
7612         struct nft_hook *this, *next;
7613
7614         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7615                 list_del(&this->list);
7616                 kfree(this);
7617         }
7618 }
7619
7620 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7621                                  struct nft_flowtable *flowtable)
7622 {
7623         const struct nlattr * const *nla = ctx->nla;
7624         struct nft_flowtable_hook flowtable_hook;
7625         LIST_HEAD(flowtable_del_list);
7626         struct nft_hook *this, *hook;
7627         struct nft_trans *trans;
7628         int err;
7629
7630         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7631                                        &flowtable_hook, flowtable, false);
7632         if (err < 0)
7633                 return err;
7634
7635         list_for_each_entry(this, &flowtable_hook.list, list) {
7636                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7637                 if (!hook) {
7638                         err = -ENOENT;
7639                         goto err_flowtable_del_hook;
7640                 }
7641                 list_move(&hook->list, &flowtable_del_list);
7642         }
7643
7644         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7645                                 sizeof(struct nft_trans_flowtable));
7646         if (!trans) {
7647                 err = -ENOMEM;
7648                 goto err_flowtable_del_hook;
7649         }
7650
7651         nft_trans_flowtable(trans) = flowtable;
7652         nft_trans_flowtable_update(trans) = true;
7653         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7654         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7655         nft_flowtable_hook_release(&flowtable_hook);
7656
7657         nft_trans_commit_list_add_tail(ctx->net, trans);
7658
7659         return 0;
7660
7661 err_flowtable_del_hook:
7662         list_splice(&flowtable_del_list, &flowtable->hook_list);
7663         nft_flowtable_hook_release(&flowtable_hook);
7664
7665         return err;
7666 }
7667
7668 static int nf_tables_delflowtable(struct sk_buff *skb,
7669                                   const struct nfnl_info *info,
7670                                   const struct nlattr * const nla[])
7671 {
7672         struct netlink_ext_ack *extack = info->extack;
7673         u8 genmask = nft_genmask_next(info->net);
7674         u8 family = info->nfmsg->nfgen_family;
7675         struct nft_flowtable *flowtable;
7676         struct net *net = info->net;
7677         const struct nlattr *attr;
7678         struct nft_table *table;
7679         struct nft_ctx ctx;
7680
7681         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7682             (!nla[NFTA_FLOWTABLE_NAME] &&
7683              !nla[NFTA_FLOWTABLE_HANDLE]))
7684                 return -EINVAL;
7685
7686         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7687                                  genmask, NETLINK_CB(skb).portid);
7688         if (IS_ERR(table)) {
7689                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7690                 return PTR_ERR(table);
7691         }
7692
7693         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7694                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7695                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7696         } else {
7697                 attr = nla[NFTA_FLOWTABLE_NAME];
7698                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7699         }
7700
7701         if (IS_ERR(flowtable)) {
7702                 NL_SET_BAD_ATTR(extack, attr);
7703                 return PTR_ERR(flowtable);
7704         }
7705
7706         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7707
7708         if (nla[NFTA_FLOWTABLE_HOOK])
7709                 return nft_delflowtable_hook(&ctx, flowtable);
7710
7711         if (flowtable->use > 0) {
7712                 NL_SET_BAD_ATTR(extack, attr);
7713                 return -EBUSY;
7714         }
7715
7716         return nft_delflowtable(&ctx, flowtable);
7717 }
7718
7719 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7720                                          u32 portid, u32 seq, int event,
7721                                          u32 flags, int family,
7722                                          struct nft_flowtable *flowtable,
7723                                          struct list_head *hook_list)
7724 {
7725         struct nlattr *nest, *nest_devs;
7726         struct nft_hook *hook;
7727         struct nlmsghdr *nlh;
7728
7729         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7730         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7731                            NFNETLINK_V0, nft_base_seq(net));
7732         if (!nlh)
7733                 goto nla_put_failure;
7734
7735         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7736             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7737             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7738             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7739                          NFTA_FLOWTABLE_PAD) ||
7740             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7741                 goto nla_put_failure;
7742
7743         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7744         if (!nest)
7745                 goto nla_put_failure;
7746         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7747             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7748                 goto nla_put_failure;
7749
7750         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7751         if (!nest_devs)
7752                 goto nla_put_failure;
7753
7754         list_for_each_entry_rcu(hook, hook_list, list) {
7755                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7756                         goto nla_put_failure;
7757         }
7758         nla_nest_end(skb, nest_devs);
7759         nla_nest_end(skb, nest);
7760
7761         nlmsg_end(skb, nlh);
7762         return 0;
7763
7764 nla_put_failure:
7765         nlmsg_trim(skb, nlh);
7766         return -1;
7767 }
7768
7769 struct nft_flowtable_filter {
7770         char            *table;
7771 };
7772
7773 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7774                                     struct netlink_callback *cb)
7775 {
7776         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7777         struct nft_flowtable_filter *filter = cb->data;
7778         unsigned int idx = 0, s_idx = cb->args[0];
7779         struct net *net = sock_net(skb->sk);
7780         int family = nfmsg->nfgen_family;
7781         struct nft_flowtable *flowtable;
7782         struct nftables_pernet *nft_net;
7783         const struct nft_table *table;
7784
7785         rcu_read_lock();
7786         nft_net = nft_pernet(net);
7787         cb->seq = nft_net->base_seq;
7788
7789         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7790                 if (family != NFPROTO_UNSPEC && family != table->family)
7791                         continue;
7792
7793                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7794                         if (!nft_is_active(net, flowtable))
7795                                 goto cont;
7796                         if (idx < s_idx)
7797                                 goto cont;
7798                         if (idx > s_idx)
7799                                 memset(&cb->args[1], 0,
7800                                        sizeof(cb->args) - sizeof(cb->args[0]));
7801                         if (filter && filter->table &&
7802                             strcmp(filter->table, table->name))
7803                                 goto cont;
7804
7805                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7806                                                           cb->nlh->nlmsg_seq,
7807                                                           NFT_MSG_NEWFLOWTABLE,
7808                                                           NLM_F_MULTI | NLM_F_APPEND,
7809                                                           table->family,
7810                                                           flowtable,
7811                                                           &flowtable->hook_list) < 0)
7812                                 goto done;
7813
7814                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7815 cont:
7816                         idx++;
7817                 }
7818         }
7819 done:
7820         rcu_read_unlock();
7821
7822         cb->args[0] = idx;
7823         return skb->len;
7824 }
7825
7826 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7827 {
7828         const struct nlattr * const *nla = cb->data;
7829         struct nft_flowtable_filter *filter = NULL;
7830
7831         if (nla[NFTA_FLOWTABLE_TABLE]) {
7832                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7833                 if (!filter)
7834                         return -ENOMEM;
7835
7836                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7837                                            GFP_ATOMIC);
7838                 if (!filter->table) {
7839                         kfree(filter);
7840                         return -ENOMEM;
7841                 }
7842         }
7843
7844         cb->data = filter;
7845         return 0;
7846 }
7847
7848 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7849 {
7850         struct nft_flowtable_filter *filter = cb->data;
7851
7852         if (!filter)
7853                 return 0;
7854
7855         kfree(filter->table);
7856         kfree(filter);
7857
7858         return 0;
7859 }
7860
7861 /* called with rcu_read_lock held */
7862 static int nf_tables_getflowtable(struct sk_buff *skb,
7863                                   const struct nfnl_info *info,
7864                                   const struct nlattr * const nla[])
7865 {
7866         u8 genmask = nft_genmask_cur(info->net);
7867         u8 family = info->nfmsg->nfgen_family;
7868         struct nft_flowtable *flowtable;
7869         const struct nft_table *table;
7870         struct net *net = info->net;
7871         struct sk_buff *skb2;
7872         int err;
7873
7874         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7875                 struct netlink_dump_control c = {
7876                         .start = nf_tables_dump_flowtable_start,
7877                         .dump = nf_tables_dump_flowtable,
7878                         .done = nf_tables_dump_flowtable_done,
7879                         .module = THIS_MODULE,
7880                         .data = (void *)nla,
7881                 };
7882
7883                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7884         }
7885
7886         if (!nla[NFTA_FLOWTABLE_NAME])
7887                 return -EINVAL;
7888
7889         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7890                                  genmask, 0);
7891         if (IS_ERR(table))
7892                 return PTR_ERR(table);
7893
7894         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7895                                          genmask);
7896         if (IS_ERR(flowtable))
7897                 return PTR_ERR(flowtable);
7898
7899         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7900         if (!skb2)
7901                 return -ENOMEM;
7902
7903         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7904                                             info->nlh->nlmsg_seq,
7905                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7906                                             flowtable, &flowtable->hook_list);
7907         if (err < 0)
7908                 goto err_fill_flowtable_info;
7909
7910         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7911
7912 err_fill_flowtable_info:
7913         kfree_skb(skb2);
7914         return err;
7915 }
7916
7917 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7918                                        struct nft_flowtable *flowtable,
7919                                        struct list_head *hook_list,
7920                                        int event)
7921 {
7922         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7923         struct sk_buff *skb;
7924         u16 flags = 0;
7925         int err;
7926
7927         if (!ctx->report &&
7928             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7929                 return;
7930
7931         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7932         if (skb == NULL)
7933                 goto err;
7934
7935         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7936                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7937
7938         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7939                                             ctx->seq, event, flags,
7940                                             ctx->family, flowtable, hook_list);
7941         if (err < 0) {
7942                 kfree_skb(skb);
7943                 goto err;
7944         }
7945
7946         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7947         return;
7948 err:
7949         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7950 }
7951
7952 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7953 {
7954         struct nft_hook *hook, *next;
7955
7956         flowtable->data.type->free(&flowtable->data);
7957         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7958                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7959                                             FLOW_BLOCK_UNBIND);
7960                 list_del_rcu(&hook->list);
7961                 kfree(hook);
7962         }
7963         kfree(flowtable->name);
7964         module_put(flowtable->data.type->owner);
7965         kfree(flowtable);
7966 }
7967
7968 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7969                                    u32 portid, u32 seq)
7970 {
7971         struct nftables_pernet *nft_net = nft_pernet(net);
7972         struct nlmsghdr *nlh;
7973         char buf[TASK_COMM_LEN];
7974         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7975
7976         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7977                            NFNETLINK_V0, nft_base_seq(net));
7978         if (!nlh)
7979                 goto nla_put_failure;
7980
7981         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7982             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7983             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7984                 goto nla_put_failure;
7985
7986         nlmsg_end(skb, nlh);
7987         return 0;
7988
7989 nla_put_failure:
7990         nlmsg_trim(skb, nlh);
7991         return -EMSGSIZE;
7992 }
7993
7994 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7995                                 struct nft_flowtable *flowtable)
7996 {
7997         struct nft_hook *hook;
7998
7999         list_for_each_entry(hook, &flowtable->hook_list, list) {
8000                 if (hook->ops.dev != dev)
8001                         continue;
8002
8003                 /* flow_offload_netdev_event() cleans up entries for us. */
8004                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8005                 list_del_rcu(&hook->list);
8006                 kfree_rcu(hook, rcu);
8007                 break;
8008         }
8009 }
8010
8011 static int nf_tables_flowtable_event(struct notifier_block *this,
8012                                      unsigned long event, void *ptr)
8013 {
8014         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8015         struct nft_flowtable *flowtable;
8016         struct nftables_pernet *nft_net;
8017         struct nft_table *table;
8018         struct net *net;
8019
8020         if (event != NETDEV_UNREGISTER)
8021                 return 0;
8022
8023         net = dev_net(dev);
8024         nft_net = nft_pernet(net);
8025         mutex_lock(&nft_net->commit_mutex);
8026         list_for_each_entry(table, &nft_net->tables, list) {
8027                 list_for_each_entry(flowtable, &table->flowtables, list) {
8028                         nft_flowtable_event(event, dev, flowtable);
8029                 }
8030         }
8031         mutex_unlock(&nft_net->commit_mutex);
8032
8033         return NOTIFY_DONE;
8034 }
8035
8036 static struct notifier_block nf_tables_flowtable_notifier = {
8037         .notifier_call  = nf_tables_flowtable_event,
8038 };
8039
8040 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8041                                  int event)
8042 {
8043         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8044         struct sk_buff *skb2;
8045         int err;
8046
8047         if (!nlmsg_report(nlh) &&
8048             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8049                 return;
8050
8051         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8052         if (skb2 == NULL)
8053                 goto err;
8054
8055         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8056                                       nlh->nlmsg_seq);
8057         if (err < 0) {
8058                 kfree_skb(skb2);
8059                 goto err;
8060         }
8061
8062         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8063                        nlmsg_report(nlh), GFP_KERNEL);
8064         return;
8065 err:
8066         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8067                           -ENOBUFS);
8068 }
8069
8070 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8071                             const struct nlattr * const nla[])
8072 {
8073         struct sk_buff *skb2;
8074         int err;
8075
8076         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8077         if (skb2 == NULL)
8078                 return -ENOMEM;
8079
8080         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8081                                       info->nlh->nlmsg_seq);
8082         if (err < 0)
8083                 goto err_fill_gen_info;
8084
8085         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8086
8087 err_fill_gen_info:
8088         kfree_skb(skb2);
8089         return err;
8090 }
8091
8092 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8093         [NFT_MSG_NEWTABLE] = {
8094                 .call           = nf_tables_newtable,
8095                 .type           = NFNL_CB_BATCH,
8096                 .attr_count     = NFTA_TABLE_MAX,
8097                 .policy         = nft_table_policy,
8098         },
8099         [NFT_MSG_GETTABLE] = {
8100                 .call           = nf_tables_gettable,
8101                 .type           = NFNL_CB_RCU,
8102                 .attr_count     = NFTA_TABLE_MAX,
8103                 .policy         = nft_table_policy,
8104         },
8105         [NFT_MSG_DELTABLE] = {
8106                 .call           = nf_tables_deltable,
8107                 .type           = NFNL_CB_BATCH,
8108                 .attr_count     = NFTA_TABLE_MAX,
8109                 .policy         = nft_table_policy,
8110         },
8111         [NFT_MSG_NEWCHAIN] = {
8112                 .call           = nf_tables_newchain,
8113                 .type           = NFNL_CB_BATCH,
8114                 .attr_count     = NFTA_CHAIN_MAX,
8115                 .policy         = nft_chain_policy,
8116         },
8117         [NFT_MSG_GETCHAIN] = {
8118                 .call           = nf_tables_getchain,
8119                 .type           = NFNL_CB_RCU,
8120                 .attr_count     = NFTA_CHAIN_MAX,
8121                 .policy         = nft_chain_policy,
8122         },
8123         [NFT_MSG_DELCHAIN] = {
8124                 .call           = nf_tables_delchain,
8125                 .type           = NFNL_CB_BATCH,
8126                 .attr_count     = NFTA_CHAIN_MAX,
8127                 .policy         = nft_chain_policy,
8128         },
8129         [NFT_MSG_NEWRULE] = {
8130                 .call           = nf_tables_newrule,
8131                 .type           = NFNL_CB_BATCH,
8132                 .attr_count     = NFTA_RULE_MAX,
8133                 .policy         = nft_rule_policy,
8134         },
8135         [NFT_MSG_GETRULE] = {
8136                 .call           = nf_tables_getrule,
8137                 .type           = NFNL_CB_RCU,
8138                 .attr_count     = NFTA_RULE_MAX,
8139                 .policy         = nft_rule_policy,
8140         },
8141         [NFT_MSG_DELRULE] = {
8142                 .call           = nf_tables_delrule,
8143                 .type           = NFNL_CB_BATCH,
8144                 .attr_count     = NFTA_RULE_MAX,
8145                 .policy         = nft_rule_policy,
8146         },
8147         [NFT_MSG_NEWSET] = {
8148                 .call           = nf_tables_newset,
8149                 .type           = NFNL_CB_BATCH,
8150                 .attr_count     = NFTA_SET_MAX,
8151                 .policy         = nft_set_policy,
8152         },
8153         [NFT_MSG_GETSET] = {
8154                 .call           = nf_tables_getset,
8155                 .type           = NFNL_CB_RCU,
8156                 .attr_count     = NFTA_SET_MAX,
8157                 .policy         = nft_set_policy,
8158         },
8159         [NFT_MSG_DELSET] = {
8160                 .call           = nf_tables_delset,
8161                 .type           = NFNL_CB_BATCH,
8162                 .attr_count     = NFTA_SET_MAX,
8163                 .policy         = nft_set_policy,
8164         },
8165         [NFT_MSG_NEWSETELEM] = {
8166                 .call           = nf_tables_newsetelem,
8167                 .type           = NFNL_CB_BATCH,
8168                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8169                 .policy         = nft_set_elem_list_policy,
8170         },
8171         [NFT_MSG_GETSETELEM] = {
8172                 .call           = nf_tables_getsetelem,
8173                 .type           = NFNL_CB_RCU,
8174                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8175                 .policy         = nft_set_elem_list_policy,
8176         },
8177         [NFT_MSG_DELSETELEM] = {
8178                 .call           = nf_tables_delsetelem,
8179                 .type           = NFNL_CB_BATCH,
8180                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8181                 .policy         = nft_set_elem_list_policy,
8182         },
8183         [NFT_MSG_GETGEN] = {
8184                 .call           = nf_tables_getgen,
8185                 .type           = NFNL_CB_RCU,
8186         },
8187         [NFT_MSG_NEWOBJ] = {
8188                 .call           = nf_tables_newobj,
8189                 .type           = NFNL_CB_BATCH,
8190                 .attr_count     = NFTA_OBJ_MAX,
8191                 .policy         = nft_obj_policy,
8192         },
8193         [NFT_MSG_GETOBJ] = {
8194                 .call           = nf_tables_getobj,
8195                 .type           = NFNL_CB_RCU,
8196                 .attr_count     = NFTA_OBJ_MAX,
8197                 .policy         = nft_obj_policy,
8198         },
8199         [NFT_MSG_DELOBJ] = {
8200                 .call           = nf_tables_delobj,
8201                 .type           = NFNL_CB_BATCH,
8202                 .attr_count     = NFTA_OBJ_MAX,
8203                 .policy         = nft_obj_policy,
8204         },
8205         [NFT_MSG_GETOBJ_RESET] = {
8206                 .call           = nf_tables_getobj,
8207                 .type           = NFNL_CB_RCU,
8208                 .attr_count     = NFTA_OBJ_MAX,
8209                 .policy         = nft_obj_policy,
8210         },
8211         [NFT_MSG_NEWFLOWTABLE] = {
8212                 .call           = nf_tables_newflowtable,
8213                 .type           = NFNL_CB_BATCH,
8214                 .attr_count     = NFTA_FLOWTABLE_MAX,
8215                 .policy         = nft_flowtable_policy,
8216         },
8217         [NFT_MSG_GETFLOWTABLE] = {
8218                 .call           = nf_tables_getflowtable,
8219                 .type           = NFNL_CB_RCU,
8220                 .attr_count     = NFTA_FLOWTABLE_MAX,
8221                 .policy         = nft_flowtable_policy,
8222         },
8223         [NFT_MSG_DELFLOWTABLE] = {
8224                 .call           = nf_tables_delflowtable,
8225                 .type           = NFNL_CB_BATCH,
8226                 .attr_count     = NFTA_FLOWTABLE_MAX,
8227                 .policy         = nft_flowtable_policy,
8228         },
8229 };
8230
8231 static int nf_tables_validate(struct net *net)
8232 {
8233         struct nftables_pernet *nft_net = nft_pernet(net);
8234         struct nft_table *table;
8235
8236         switch (nft_net->validate_state) {
8237         case NFT_VALIDATE_SKIP:
8238                 break;
8239         case NFT_VALIDATE_NEED:
8240                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8241                 fallthrough;
8242         case NFT_VALIDATE_DO:
8243                 list_for_each_entry(table, &nft_net->tables, list) {
8244                         if (nft_table_validate(net, table) < 0)
8245                                 return -EAGAIN;
8246                 }
8247                 break;
8248         }
8249
8250         return 0;
8251 }
8252
8253 /* a drop policy has to be deferred until all rules have been activated,
8254  * otherwise a large ruleset that contains a drop-policy base chain will
8255  * cause all packets to get dropped until the full transaction has been
8256  * processed.
8257  *
8258  * We defer the drop policy until the transaction has been finalized.
8259  */
8260 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8261 {
8262         struct nft_base_chain *basechain;
8263
8264         if (nft_trans_chain_policy(trans) != NF_DROP)
8265                 return;
8266
8267         if (!nft_is_base_chain(trans->ctx.chain))
8268                 return;
8269
8270         basechain = nft_base_chain(trans->ctx.chain);
8271         basechain->policy = NF_DROP;
8272 }
8273
8274 static void nft_chain_commit_update(struct nft_trans *trans)
8275 {
8276         struct nft_base_chain *basechain;
8277
8278         if (nft_trans_chain_name(trans)) {
8279                 rhltable_remove(&trans->ctx.table->chains_ht,
8280                                 &trans->ctx.chain->rhlhead,
8281                                 nft_chain_ht_params);
8282                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8283                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8284                                     trans->ctx.chain->name,
8285                                     &trans->ctx.chain->rhlhead,
8286                                     nft_chain_ht_params);
8287         }
8288
8289         if (!nft_is_base_chain(trans->ctx.chain))
8290                 return;
8291
8292         nft_chain_stats_replace(trans);
8293
8294         basechain = nft_base_chain(trans->ctx.chain);
8295
8296         switch (nft_trans_chain_policy(trans)) {
8297         case NF_DROP:
8298         case NF_ACCEPT:
8299                 basechain->policy = nft_trans_chain_policy(trans);
8300                 break;
8301         }
8302 }
8303
8304 static void nft_obj_commit_update(struct nft_trans *trans)
8305 {
8306         struct nft_object *newobj;
8307         struct nft_object *obj;
8308
8309         obj = nft_trans_obj(trans);
8310         newobj = nft_trans_obj_newobj(trans);
8311
8312         if (obj->ops->update)
8313                 obj->ops->update(obj, newobj);
8314
8315         nft_obj_destroy(&trans->ctx, newobj);
8316 }
8317
8318 static void nft_commit_release(struct nft_trans *trans)
8319 {
8320         switch (trans->msg_type) {
8321         case NFT_MSG_DELTABLE:
8322                 nf_tables_table_destroy(&trans->ctx);
8323                 break;
8324         case NFT_MSG_NEWCHAIN:
8325                 free_percpu(nft_trans_chain_stats(trans));
8326                 kfree(nft_trans_chain_name(trans));
8327                 break;
8328         case NFT_MSG_DELCHAIN:
8329                 nf_tables_chain_destroy(&trans->ctx);
8330                 break;
8331         case NFT_MSG_DELRULE:
8332                 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8333                         nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8334
8335                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8336                 break;
8337         case NFT_MSG_DELSET:
8338                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8339                 break;
8340         case NFT_MSG_DELSETELEM:
8341                 nf_tables_set_elem_destroy(&trans->ctx,
8342                                            nft_trans_elem_set(trans),
8343                                            nft_trans_elem(trans).priv);
8344                 break;
8345         case NFT_MSG_DELOBJ:
8346                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8347                 break;
8348         case NFT_MSG_DELFLOWTABLE:
8349                 if (nft_trans_flowtable_update(trans))
8350                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8351                 else
8352                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8353                 break;
8354         }
8355
8356         if (trans->put_net)
8357                 put_net(trans->ctx.net);
8358
8359         kfree(trans);
8360 }
8361
8362 static void nf_tables_trans_destroy_work(struct work_struct *w)
8363 {
8364         struct nft_trans *trans, *next;
8365         LIST_HEAD(head);
8366
8367         spin_lock(&nf_tables_destroy_list_lock);
8368         list_splice_init(&nf_tables_destroy_list, &head);
8369         spin_unlock(&nf_tables_destroy_list_lock);
8370
8371         if (list_empty(&head))
8372                 return;
8373
8374         synchronize_rcu();
8375
8376         list_for_each_entry_safe(trans, next, &head, list) {
8377                 list_del(&trans->list);
8378                 nft_commit_release(trans);
8379         }
8380 }
8381
8382 void nf_tables_trans_destroy_flush_work(void)
8383 {
8384         flush_work(&trans_destroy_work);
8385 }
8386 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8387
8388 static bool nft_expr_reduce(struct nft_regs_track *track,
8389                             const struct nft_expr *expr)
8390 {
8391         return false;
8392 }
8393
8394 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8395 {
8396         const struct nft_expr *expr, *last;
8397         struct nft_regs_track track = {};
8398         unsigned int size, data_size;
8399         void *data, *data_boundary;
8400         struct nft_rule_dp *prule;
8401         struct nft_rule *rule;
8402
8403         /* already handled or inactive chain? */
8404         if (chain->blob_next || !nft_is_active_next(net, chain))
8405                 return 0;
8406
8407         data_size = 0;
8408         list_for_each_entry(rule, &chain->rules, list) {
8409                 if (nft_is_active_next(net, rule)) {
8410                         data_size += sizeof(*prule) + rule->dlen;
8411                         if (data_size > INT_MAX)
8412                                 return -ENOMEM;
8413                 }
8414         }
8415         data_size += offsetof(struct nft_rule_dp, data);        /* last rule */
8416
8417         chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8418         if (!chain->blob_next)
8419                 return -ENOMEM;
8420
8421         data = (void *)chain->blob_next->data;
8422         data_boundary = data + data_size;
8423         size = 0;
8424
8425         list_for_each_entry(rule, &chain->rules, list) {
8426                 if (!nft_is_active_next(net, rule))
8427                         continue;
8428
8429                 prule = (struct nft_rule_dp *)data;
8430                 data += offsetof(struct nft_rule_dp, data);
8431                 if (WARN_ON_ONCE(data > data_boundary))
8432                         return -ENOMEM;
8433
8434                 size = 0;
8435                 track.last = nft_expr_last(rule);
8436                 nft_rule_for_each_expr(expr, last, rule) {
8437                         track.cur = expr;
8438
8439                         if (nft_expr_reduce(&track, expr)) {
8440                                 expr = track.cur;
8441                                 continue;
8442                         }
8443
8444                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8445                                 return -ENOMEM;
8446
8447                         memcpy(data + size, expr, expr->ops->size);
8448                         size += expr->ops->size;
8449                 }
8450                 if (WARN_ON_ONCE(size >= 1 << 12))
8451                         return -ENOMEM;
8452
8453                 prule->handle = rule->handle;
8454                 prule->dlen = size;
8455                 prule->is_last = 0;
8456
8457                 data += size;
8458                 size = 0;
8459                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8460         }
8461
8462         prule = (struct nft_rule_dp *)data;
8463         data += offsetof(struct nft_rule_dp, data);
8464         if (WARN_ON_ONCE(data > data_boundary))
8465                 return -ENOMEM;
8466
8467         nft_last_rule(chain->blob_next, prule);
8468
8469         return 0;
8470 }
8471
8472 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8473 {
8474         struct nftables_pernet *nft_net = nft_pernet(net);
8475         struct nft_trans *trans, *next;
8476
8477         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8478                 struct nft_chain *chain = trans->ctx.chain;
8479
8480                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8481                     trans->msg_type == NFT_MSG_DELRULE) {
8482                         kvfree(chain->blob_next);
8483                         chain->blob_next = NULL;
8484                 }
8485         }
8486 }
8487
8488 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8489 {
8490         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8491
8492         kvfree(o->blob);
8493 }
8494
8495 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8496 {
8497         struct nft_rules_old *old;
8498
8499         /* rcu_head is after end marker */
8500         old = (void *)blob + sizeof(*blob) + blob->size;
8501         old->blob = blob;
8502
8503         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8504 }
8505
8506 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8507 {
8508         struct nft_rule_blob *g0, *g1;
8509         bool next_genbit;
8510
8511         next_genbit = nft_gencursor_next(net);
8512
8513         g0 = rcu_dereference_protected(chain->blob_gen_0,
8514                                        lockdep_commit_lock_is_held(net));
8515         g1 = rcu_dereference_protected(chain->blob_gen_1,
8516                                        lockdep_commit_lock_is_held(net));
8517
8518         /* No changes to this chain? */
8519         if (chain->blob_next == NULL) {
8520                 /* chain had no change in last or next generation */
8521                 if (g0 == g1)
8522                         return;
8523                 /*
8524                  * chain had no change in this generation; make sure next
8525                  * one uses same rules as current generation.
8526                  */
8527                 if (next_genbit) {
8528                         rcu_assign_pointer(chain->blob_gen_1, g0);
8529                         nf_tables_commit_chain_free_rules_old(g1);
8530                 } else {
8531                         rcu_assign_pointer(chain->blob_gen_0, g1);
8532                         nf_tables_commit_chain_free_rules_old(g0);
8533                 }
8534
8535                 return;
8536         }
8537
8538         if (next_genbit)
8539                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8540         else
8541                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8542
8543         chain->blob_next = NULL;
8544
8545         if (g0 == g1)
8546                 return;
8547
8548         if (next_genbit)
8549                 nf_tables_commit_chain_free_rules_old(g1);
8550         else
8551                 nf_tables_commit_chain_free_rules_old(g0);
8552 }
8553
8554 static void nft_obj_del(struct nft_object *obj)
8555 {
8556         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8557         list_del_rcu(&obj->list);
8558 }
8559
8560 void nft_chain_del(struct nft_chain *chain)
8561 {
8562         struct nft_table *table = chain->table;
8563
8564         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8565                                      nft_chain_ht_params));
8566         list_del_rcu(&chain->list);
8567 }
8568
8569 static void nf_tables_module_autoload_cleanup(struct net *net)
8570 {
8571         struct nftables_pernet *nft_net = nft_pernet(net);
8572         struct nft_module_request *req, *next;
8573
8574         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8575         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8576                 WARN_ON_ONCE(!req->done);
8577                 list_del(&req->list);
8578                 kfree(req);
8579         }
8580 }
8581
8582 static void nf_tables_commit_release(struct net *net)
8583 {
8584         struct nftables_pernet *nft_net = nft_pernet(net);
8585         struct nft_trans *trans;
8586
8587         /* all side effects have to be made visible.
8588          * For example, if a chain named 'foo' has been deleted, a
8589          * new transaction must not find it anymore.
8590          *
8591          * Memory reclaim happens asynchronously from work queue
8592          * to prevent expensive synchronize_rcu() in commit phase.
8593          */
8594         if (list_empty(&nft_net->commit_list)) {
8595                 nf_tables_module_autoload_cleanup(net);
8596                 mutex_unlock(&nft_net->commit_mutex);
8597                 return;
8598         }
8599
8600         trans = list_last_entry(&nft_net->commit_list,
8601                                 struct nft_trans, list);
8602         get_net(trans->ctx.net);
8603         WARN_ON_ONCE(trans->put_net);
8604
8605         trans->put_net = true;
8606         spin_lock(&nf_tables_destroy_list_lock);
8607         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8608         spin_unlock(&nf_tables_destroy_list_lock);
8609
8610         nf_tables_module_autoload_cleanup(net);
8611         schedule_work(&trans_destroy_work);
8612
8613         mutex_unlock(&nft_net->commit_mutex);
8614 }
8615
8616 static void nft_commit_notify(struct net *net, u32 portid)
8617 {
8618         struct nftables_pernet *nft_net = nft_pernet(net);
8619         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8620         unsigned char *data;
8621         int len;
8622
8623         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8624                 if (!batch_skb) {
8625 new_batch:
8626                         batch_skb = skb;
8627                         len = NLMSG_GOODSIZE - skb->len;
8628                         list_del(&skb->list);
8629                         continue;
8630                 }
8631                 len -= skb->len;
8632                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8633                         data = skb_put(batch_skb, skb->len);
8634                         memcpy(data, skb->data, skb->len);
8635                         list_del(&skb->list);
8636                         kfree_skb(skb);
8637                         continue;
8638                 }
8639                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8640                                NFT_CB(batch_skb).report, GFP_KERNEL);
8641                 goto new_batch;
8642         }
8643
8644         if (batch_skb) {
8645                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8646                                NFT_CB(batch_skb).report, GFP_KERNEL);
8647         }
8648
8649         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8650 }
8651
8652 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8653                                         struct nft_table *table)
8654 {
8655         struct nft_audit_data *adp;
8656
8657         list_for_each_entry(adp, adl, list) {
8658                 if (adp->table == table)
8659                         return 0;
8660         }
8661         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8662         if (!adp)
8663                 return -ENOMEM;
8664         adp->table = table;
8665         list_add(&adp->list, adl);
8666         return 0;
8667 }
8668
8669 static void nf_tables_commit_audit_free(struct list_head *adl)
8670 {
8671         struct nft_audit_data *adp, *adn;
8672
8673         list_for_each_entry_safe(adp, adn, adl, list) {
8674                 list_del(&adp->list);
8675                 kfree(adp);
8676         }
8677 }
8678
8679 static void nf_tables_commit_audit_collect(struct list_head *adl,
8680                                            struct nft_table *table, u32 op)
8681 {
8682         struct nft_audit_data *adp;
8683
8684         list_for_each_entry(adp, adl, list) {
8685                 if (adp->table == table)
8686                         goto found;
8687         }
8688         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8689         return;
8690 found:
8691         adp->entries++;
8692         if (!adp->op || adp->op > op)
8693                 adp->op = op;
8694 }
8695
8696 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8697
8698 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8699 {
8700         struct nft_audit_data *adp, *adn;
8701         char aubuf[AUNFTABLENAMELEN];
8702
8703         list_for_each_entry_safe(adp, adn, adl, list) {
8704                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8705                          generation);
8706                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8707                                 nft2audit_op[adp->op], GFP_KERNEL);
8708                 list_del(&adp->list);
8709                 kfree(adp);
8710         }
8711 }
8712
8713 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8714 {
8715         struct nftables_pernet *nft_net = nft_pernet(net);
8716         struct nft_trans *trans, *next;
8717         struct nft_trans_elem *te;
8718         struct nft_chain *chain;
8719         struct nft_table *table;
8720         LIST_HEAD(adl);
8721         int err;
8722
8723         if (list_empty(&nft_net->commit_list)) {
8724                 mutex_unlock(&nft_net->commit_mutex);
8725                 return 0;
8726         }
8727
8728         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8729         if (nf_tables_validate(net) < 0)
8730                 return -EAGAIN;
8731
8732         err = nft_flow_rule_offload_commit(net);
8733         if (err < 0)
8734                 return err;
8735
8736         /* 1.  Allocate space for next generation rules_gen_X[] */
8737         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8738                 int ret;
8739
8740                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8741                 if (ret) {
8742                         nf_tables_commit_chain_prepare_cancel(net);
8743                         nf_tables_commit_audit_free(&adl);
8744                         return ret;
8745                 }
8746                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8747                     trans->msg_type == NFT_MSG_DELRULE) {
8748                         chain = trans->ctx.chain;
8749
8750                         ret = nf_tables_commit_chain_prepare(net, chain);
8751                         if (ret < 0) {
8752                                 nf_tables_commit_chain_prepare_cancel(net);
8753                                 nf_tables_commit_audit_free(&adl);
8754                                 return ret;
8755                         }
8756                 }
8757         }
8758
8759         /* step 2.  Make rules_gen_X visible to packet path */
8760         list_for_each_entry(table, &nft_net->tables, list) {
8761                 list_for_each_entry(chain, &table->chains, list)
8762                         nf_tables_commit_chain(net, chain);
8763         }
8764
8765         /*
8766          * Bump generation counter, invalidate any dump in progress.
8767          * Cannot fail after this point.
8768          */
8769         while (++nft_net->base_seq == 0)
8770                 ;
8771
8772         /* step 3. Start new generation, rules_gen_X now in use. */
8773         net->nft.gencursor = nft_gencursor_next(net);
8774
8775         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8776                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8777                                                trans->msg_type);
8778                 switch (trans->msg_type) {
8779                 case NFT_MSG_NEWTABLE:
8780                         if (nft_trans_table_update(trans)) {
8781                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8782                                         nft_trans_destroy(trans);
8783                                         break;
8784                                 }
8785                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8786                                         nf_tables_table_disable(net, trans->ctx.table);
8787
8788                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8789                         } else {
8790                                 nft_clear(net, trans->ctx.table);
8791                         }
8792                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8793                         nft_trans_destroy(trans);
8794                         break;
8795                 case NFT_MSG_DELTABLE:
8796                         list_del_rcu(&trans->ctx.table->list);
8797                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8798                         break;
8799                 case NFT_MSG_NEWCHAIN:
8800                         if (nft_trans_chain_update(trans)) {
8801                                 nft_chain_commit_update(trans);
8802                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8803                                 /* trans destroyed after rcu grace period */
8804                         } else {
8805                                 nft_chain_commit_drop_policy(trans);
8806                                 nft_clear(net, trans->ctx.chain);
8807                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8808                                 nft_trans_destroy(trans);
8809                         }
8810                         break;
8811                 case NFT_MSG_DELCHAIN:
8812                         nft_chain_del(trans->ctx.chain);
8813                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8814                         nf_tables_unregister_hook(trans->ctx.net,
8815                                                   trans->ctx.table,
8816                                                   trans->ctx.chain);
8817                         break;
8818                 case NFT_MSG_NEWRULE:
8819                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8820                         nf_tables_rule_notify(&trans->ctx,
8821                                               nft_trans_rule(trans),
8822                                               NFT_MSG_NEWRULE);
8823                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8824                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8825
8826                         nft_trans_destroy(trans);
8827                         break;
8828                 case NFT_MSG_DELRULE:
8829                         list_del_rcu(&nft_trans_rule(trans)->list);
8830                         nf_tables_rule_notify(&trans->ctx,
8831                                               nft_trans_rule(trans),
8832                                               NFT_MSG_DELRULE);
8833                         nft_rule_expr_deactivate(&trans->ctx,
8834                                                  nft_trans_rule(trans),
8835                                                  NFT_TRANS_COMMIT);
8836                         break;
8837                 case NFT_MSG_NEWSET:
8838                         nft_clear(net, nft_trans_set(trans));
8839                         /* This avoids hitting -EBUSY when deleting the table
8840                          * from the transaction.
8841                          */
8842                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8843                             !list_empty(&nft_trans_set(trans)->bindings))
8844                                 trans->ctx.table->use--;
8845
8846                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8847                                              NFT_MSG_NEWSET, GFP_KERNEL);
8848                         nft_trans_destroy(trans);
8849                         break;
8850                 case NFT_MSG_DELSET:
8851                         list_del_rcu(&nft_trans_set(trans)->list);
8852                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8853                                              NFT_MSG_DELSET, GFP_KERNEL);
8854                         break;
8855                 case NFT_MSG_NEWSETELEM:
8856                         te = (struct nft_trans_elem *)trans->data;
8857
8858                         nft_setelem_activate(net, te->set, &te->elem);
8859                         nf_tables_setelem_notify(&trans->ctx, te->set,
8860                                                  &te->elem,
8861                                                  NFT_MSG_NEWSETELEM);
8862                         nft_trans_destroy(trans);
8863                         break;
8864                 case NFT_MSG_DELSETELEM:
8865                         te = (struct nft_trans_elem *)trans->data;
8866
8867                         nf_tables_setelem_notify(&trans->ctx, te->set,
8868                                                  &te->elem,
8869                                                  NFT_MSG_DELSETELEM);
8870                         nft_setelem_remove(net, te->set, &te->elem);
8871                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8872                                 atomic_dec(&te->set->nelems);
8873                                 te->set->ndeact--;
8874                         }
8875                         break;
8876                 case NFT_MSG_NEWOBJ:
8877                         if (nft_trans_obj_update(trans)) {
8878                                 nft_obj_commit_update(trans);
8879                                 nf_tables_obj_notify(&trans->ctx,
8880                                                      nft_trans_obj(trans),
8881                                                      NFT_MSG_NEWOBJ);
8882                         } else {
8883                                 nft_clear(net, nft_trans_obj(trans));
8884                                 nf_tables_obj_notify(&trans->ctx,
8885                                                      nft_trans_obj(trans),
8886                                                      NFT_MSG_NEWOBJ);
8887                                 nft_trans_destroy(trans);
8888                         }
8889                         break;
8890                 case NFT_MSG_DELOBJ:
8891                         nft_obj_del(nft_trans_obj(trans));
8892                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8893                                              NFT_MSG_DELOBJ);
8894                         break;
8895                 case NFT_MSG_NEWFLOWTABLE:
8896                         if (nft_trans_flowtable_update(trans)) {
8897                                 nft_trans_flowtable(trans)->data.flags =
8898                                         nft_trans_flowtable_flags(trans);
8899                                 nf_tables_flowtable_notify(&trans->ctx,
8900                                                            nft_trans_flowtable(trans),
8901                                                            &nft_trans_flowtable_hooks(trans),
8902                                                            NFT_MSG_NEWFLOWTABLE);
8903                                 list_splice(&nft_trans_flowtable_hooks(trans),
8904                                             &nft_trans_flowtable(trans)->hook_list);
8905                         } else {
8906                                 nft_clear(net, nft_trans_flowtable(trans));
8907                                 nf_tables_flowtable_notify(&trans->ctx,
8908                                                            nft_trans_flowtable(trans),
8909                                                            &nft_trans_flowtable(trans)->hook_list,
8910                                                            NFT_MSG_NEWFLOWTABLE);
8911                         }
8912                         nft_trans_destroy(trans);
8913                         break;
8914                 case NFT_MSG_DELFLOWTABLE:
8915                         if (nft_trans_flowtable_update(trans)) {
8916                                 nf_tables_flowtable_notify(&trans->ctx,
8917                                                            nft_trans_flowtable(trans),
8918                                                            &nft_trans_flowtable_hooks(trans),
8919                                                            NFT_MSG_DELFLOWTABLE);
8920                                 nft_unregister_flowtable_net_hooks(net,
8921                                                                    &nft_trans_flowtable_hooks(trans));
8922                         } else {
8923                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
8924                                 nf_tables_flowtable_notify(&trans->ctx,
8925                                                            nft_trans_flowtable(trans),
8926                                                            &nft_trans_flowtable(trans)->hook_list,
8927                                                            NFT_MSG_DELFLOWTABLE);
8928                                 nft_unregister_flowtable_net_hooks(net,
8929                                                 &nft_trans_flowtable(trans)->hook_list);
8930                         }
8931                         break;
8932                 }
8933         }
8934
8935         nft_commit_notify(net, NETLINK_CB(skb).portid);
8936         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8937         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8938         nf_tables_commit_release(net);
8939
8940         return 0;
8941 }
8942
8943 static void nf_tables_module_autoload(struct net *net)
8944 {
8945         struct nftables_pernet *nft_net = nft_pernet(net);
8946         struct nft_module_request *req, *next;
8947         LIST_HEAD(module_list);
8948
8949         list_splice_init(&nft_net->module_list, &module_list);
8950         mutex_unlock(&nft_net->commit_mutex);
8951         list_for_each_entry_safe(req, next, &module_list, list) {
8952                 request_module("%s", req->module);
8953                 req->done = true;
8954         }
8955         mutex_lock(&nft_net->commit_mutex);
8956         list_splice(&module_list, &nft_net->module_list);
8957 }
8958
8959 static void nf_tables_abort_release(struct nft_trans *trans)
8960 {
8961         switch (trans->msg_type) {
8962         case NFT_MSG_NEWTABLE:
8963                 nf_tables_table_destroy(&trans->ctx);
8964                 break;
8965         case NFT_MSG_NEWCHAIN:
8966                 nf_tables_chain_destroy(&trans->ctx);
8967                 break;
8968         case NFT_MSG_NEWRULE:
8969                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8970                 break;
8971         case NFT_MSG_NEWSET:
8972                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8973                 break;
8974         case NFT_MSG_NEWSETELEM:
8975                 nft_set_elem_destroy(nft_trans_elem_set(trans),
8976                                      nft_trans_elem(trans).priv, true);
8977                 break;
8978         case NFT_MSG_NEWOBJ:
8979                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8980                 break;
8981         case NFT_MSG_NEWFLOWTABLE:
8982                 if (nft_trans_flowtable_update(trans))
8983                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8984                 else
8985                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8986                 break;
8987         }
8988         kfree(trans);
8989 }
8990
8991 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8992 {
8993         struct nftables_pernet *nft_net = nft_pernet(net);
8994         struct nft_trans *trans, *next;
8995         struct nft_trans_elem *te;
8996
8997         if (action == NFNL_ABORT_VALIDATE &&
8998             nf_tables_validate(net) < 0)
8999                 return -EAGAIN;
9000
9001         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9002                                          list) {
9003                 switch (trans->msg_type) {
9004                 case NFT_MSG_NEWTABLE:
9005                         if (nft_trans_table_update(trans)) {
9006                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9007                                         nft_trans_destroy(trans);
9008                                         break;
9009                                 }
9010                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9011                                         nf_tables_table_disable(net, trans->ctx.table);
9012                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9013                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9014                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9015                                 }
9016                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9017                                 nft_trans_destroy(trans);
9018                         } else {
9019                                 list_del_rcu(&trans->ctx.table->list);
9020                         }
9021                         break;
9022                 case NFT_MSG_DELTABLE:
9023                         nft_clear(trans->ctx.net, trans->ctx.table);
9024                         nft_trans_destroy(trans);
9025                         break;
9026                 case NFT_MSG_NEWCHAIN:
9027                         if (nft_trans_chain_update(trans)) {
9028                                 free_percpu(nft_trans_chain_stats(trans));
9029                                 kfree(nft_trans_chain_name(trans));
9030                                 nft_trans_destroy(trans);
9031                         } else {
9032                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9033                                         nft_trans_destroy(trans);
9034                                         break;
9035                                 }
9036                                 trans->ctx.table->use--;
9037                                 nft_chain_del(trans->ctx.chain);
9038                                 nf_tables_unregister_hook(trans->ctx.net,
9039                                                           trans->ctx.table,
9040                                                           trans->ctx.chain);
9041                         }
9042                         break;
9043                 case NFT_MSG_DELCHAIN:
9044                         trans->ctx.table->use++;
9045                         nft_clear(trans->ctx.net, trans->ctx.chain);
9046                         nft_trans_destroy(trans);
9047                         break;
9048                 case NFT_MSG_NEWRULE:
9049                         trans->ctx.chain->use--;
9050                         list_del_rcu(&nft_trans_rule(trans)->list);
9051                         nft_rule_expr_deactivate(&trans->ctx,
9052                                                  nft_trans_rule(trans),
9053                                                  NFT_TRANS_ABORT);
9054                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9055                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9056                         break;
9057                 case NFT_MSG_DELRULE:
9058                         trans->ctx.chain->use++;
9059                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9060                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9061                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9062                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9063
9064                         nft_trans_destroy(trans);
9065                         break;
9066                 case NFT_MSG_NEWSET:
9067                         trans->ctx.table->use--;
9068                         if (nft_trans_set_bound(trans)) {
9069                                 nft_trans_destroy(trans);
9070                                 break;
9071                         }
9072                         list_del_rcu(&nft_trans_set(trans)->list);
9073                         break;
9074                 case NFT_MSG_DELSET:
9075                         trans->ctx.table->use++;
9076                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9077                         nft_trans_destroy(trans);
9078                         break;
9079                 case NFT_MSG_NEWSETELEM:
9080                         if (nft_trans_elem_set_bound(trans)) {
9081                                 nft_trans_destroy(trans);
9082                                 break;
9083                         }
9084                         te = (struct nft_trans_elem *)trans->data;
9085                         nft_setelem_remove(net, te->set, &te->elem);
9086                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9087                                 atomic_dec(&te->set->nelems);
9088                         break;
9089                 case NFT_MSG_DELSETELEM:
9090                         te = (struct nft_trans_elem *)trans->data;
9091
9092                         nft_setelem_data_activate(net, te->set, &te->elem);
9093                         nft_setelem_activate(net, te->set, &te->elem);
9094                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9095                                 te->set->ndeact--;
9096
9097                         nft_trans_destroy(trans);
9098                         break;
9099                 case NFT_MSG_NEWOBJ:
9100                         if (nft_trans_obj_update(trans)) {
9101                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9102                                 nft_trans_destroy(trans);
9103                         } else {
9104                                 trans->ctx.table->use--;
9105                                 nft_obj_del(nft_trans_obj(trans));
9106                         }
9107                         break;
9108                 case NFT_MSG_DELOBJ:
9109                         trans->ctx.table->use++;
9110                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9111                         nft_trans_destroy(trans);
9112                         break;
9113                 case NFT_MSG_NEWFLOWTABLE:
9114                         if (nft_trans_flowtable_update(trans)) {
9115                                 nft_unregister_flowtable_net_hooks(net,
9116                                                 &nft_trans_flowtable_hooks(trans));
9117                         } else {
9118                                 trans->ctx.table->use--;
9119                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9120                                 nft_unregister_flowtable_net_hooks(net,
9121                                                 &nft_trans_flowtable(trans)->hook_list);
9122                         }
9123                         break;
9124                 case NFT_MSG_DELFLOWTABLE:
9125                         if (nft_trans_flowtable_update(trans)) {
9126                                 list_splice(&nft_trans_flowtable_hooks(trans),
9127                                             &nft_trans_flowtable(trans)->hook_list);
9128                         } else {
9129                                 trans->ctx.table->use++;
9130                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9131                         }
9132                         nft_trans_destroy(trans);
9133                         break;
9134                 }
9135         }
9136
9137         synchronize_rcu();
9138
9139         list_for_each_entry_safe_reverse(trans, next,
9140                                          &nft_net->commit_list, list) {
9141                 list_del(&trans->list);
9142                 nf_tables_abort_release(trans);
9143         }
9144
9145         if (action == NFNL_ABORT_AUTOLOAD)
9146                 nf_tables_module_autoload(net);
9147         else
9148                 nf_tables_module_autoload_cleanup(net);
9149
9150         return 0;
9151 }
9152
9153 static void nf_tables_cleanup(struct net *net)
9154 {
9155         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9156 }
9157
9158 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9159                            enum nfnl_abort_action action)
9160 {
9161         struct nftables_pernet *nft_net = nft_pernet(net);
9162         int ret = __nf_tables_abort(net, action);
9163
9164         mutex_unlock(&nft_net->commit_mutex);
9165
9166         return ret;
9167 }
9168
9169 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9170 {
9171         struct nftables_pernet *nft_net = nft_pernet(net);
9172         bool genid_ok;
9173
9174         mutex_lock(&nft_net->commit_mutex);
9175
9176         genid_ok = genid == 0 || nft_net->base_seq == genid;
9177         if (!genid_ok)
9178                 mutex_unlock(&nft_net->commit_mutex);
9179
9180         /* else, commit mutex has to be released by commit or abort function */
9181         return genid_ok;
9182 }
9183
9184 static const struct nfnetlink_subsystem nf_tables_subsys = {
9185         .name           = "nf_tables",
9186         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9187         .cb_count       = NFT_MSG_MAX,
9188         .cb             = nf_tables_cb,
9189         .commit         = nf_tables_commit,
9190         .abort          = nf_tables_abort,
9191         .cleanup        = nf_tables_cleanup,
9192         .valid_genid    = nf_tables_valid_genid,
9193         .owner          = THIS_MODULE,
9194 };
9195
9196 int nft_chain_validate_dependency(const struct nft_chain *chain,
9197                                   enum nft_chain_types type)
9198 {
9199         const struct nft_base_chain *basechain;
9200
9201         if (nft_is_base_chain(chain)) {
9202                 basechain = nft_base_chain(chain);
9203                 if (basechain->type->type != type)
9204                         return -EOPNOTSUPP;
9205         }
9206         return 0;
9207 }
9208 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9209
9210 int nft_chain_validate_hooks(const struct nft_chain *chain,
9211                              unsigned int hook_flags)
9212 {
9213         struct nft_base_chain *basechain;
9214
9215         if (nft_is_base_chain(chain)) {
9216                 basechain = nft_base_chain(chain);
9217
9218                 if ((1 << basechain->ops.hooknum) & hook_flags)
9219                         return 0;
9220
9221                 return -EOPNOTSUPP;
9222         }
9223
9224         return 0;
9225 }
9226 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9227
9228 /*
9229  * Loop detection - walk through the ruleset beginning at the destination chain
9230  * of a new jump until either the source chain is reached (loop) or all
9231  * reachable chains have been traversed.
9232  *
9233  * The loop check is performed whenever a new jump verdict is added to an
9234  * expression or verdict map or a verdict map is bound to a new chain.
9235  */
9236
9237 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9238                                  const struct nft_chain *chain);
9239
9240 static int nft_check_loops(const struct nft_ctx *ctx,
9241                            const struct nft_set_ext *ext)
9242 {
9243         const struct nft_data *data;
9244         int ret;
9245
9246         data = nft_set_ext_data(ext);
9247         switch (data->verdict.code) {
9248         case NFT_JUMP:
9249         case NFT_GOTO:
9250                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9251                 break;
9252         default:
9253                 ret = 0;
9254                 break;
9255         }
9256
9257         return ret;
9258 }
9259
9260 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9261                                         struct nft_set *set,
9262                                         const struct nft_set_iter *iter,
9263                                         struct nft_set_elem *elem)
9264 {
9265         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9266
9267         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9268             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9269                 return 0;
9270
9271         return nft_check_loops(ctx, ext);
9272 }
9273
9274 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9275                                   struct nft_set *set)
9276 {
9277         u8 genmask = nft_genmask_next(ctx->net);
9278         struct nft_set_elem_catchall *catchall;
9279         struct nft_set_ext *ext;
9280         int ret = 0;
9281
9282         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9283                 ext = nft_set_elem_ext(set, catchall->elem);
9284                 if (!nft_set_elem_active(ext, genmask))
9285                         continue;
9286
9287                 ret = nft_check_loops(ctx, ext);
9288                 if (ret < 0)
9289                         return ret;
9290         }
9291
9292         return ret;
9293 }
9294
9295 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9296                                  const struct nft_chain *chain)
9297 {
9298         const struct nft_rule *rule;
9299         const struct nft_expr *expr, *last;
9300         struct nft_set *set;
9301         struct nft_set_binding *binding;
9302         struct nft_set_iter iter;
9303
9304         if (ctx->chain == chain)
9305                 return -ELOOP;
9306
9307         list_for_each_entry(rule, &chain->rules, list) {
9308                 nft_rule_for_each_expr(expr, last, rule) {
9309                         struct nft_immediate_expr *priv;
9310                         const struct nft_data *data;
9311                         int err;
9312
9313                         if (strcmp(expr->ops->type->name, "immediate"))
9314                                 continue;
9315
9316                         priv = nft_expr_priv(expr);
9317                         if (priv->dreg != NFT_REG_VERDICT)
9318                                 continue;
9319
9320                         data = &priv->data;
9321                         switch (data->verdict.code) {
9322                         case NFT_JUMP:
9323                         case NFT_GOTO:
9324                                 err = nf_tables_check_loops(ctx,
9325                                                         data->verdict.chain);
9326                                 if (err < 0)
9327                                         return err;
9328                                 break;
9329                         default:
9330                                 break;
9331                         }
9332                 }
9333         }
9334
9335         list_for_each_entry(set, &ctx->table->sets, list) {
9336                 if (!nft_is_active_next(ctx->net, set))
9337                         continue;
9338                 if (!(set->flags & NFT_SET_MAP) ||
9339                     set->dtype != NFT_DATA_VERDICT)
9340                         continue;
9341
9342                 list_for_each_entry(binding, &set->bindings, list) {
9343                         if (!(binding->flags & NFT_SET_MAP) ||
9344                             binding->chain != chain)
9345                                 continue;
9346
9347                         iter.genmask    = nft_genmask_next(ctx->net);
9348                         iter.skip       = 0;
9349                         iter.count      = 0;
9350                         iter.err        = 0;
9351                         iter.fn         = nf_tables_loop_check_setelem;
9352
9353                         set->ops->walk(ctx, set, &iter);
9354                         if (!iter.err)
9355                                 iter.err = nft_set_catchall_loops(ctx, set);
9356
9357                         if (iter.err < 0)
9358                                 return iter.err;
9359                 }
9360         }
9361
9362         return 0;
9363 }
9364
9365 /**
9366  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9367  *
9368  *      @attr: netlink attribute to fetch value from
9369  *      @max: maximum value to be stored in dest
9370  *      @dest: pointer to the variable
9371  *
9372  *      Parse, check and store a given u32 netlink attribute into variable.
9373  *      This function returns -ERANGE if the value goes over maximum value.
9374  *      Otherwise a 0 is returned and the attribute value is stored in the
9375  *      destination variable.
9376  */
9377 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9378 {
9379         u32 val;
9380
9381         val = ntohl(nla_get_be32(attr));
9382         if (val > max)
9383                 return -ERANGE;
9384
9385         *dest = val;
9386         return 0;
9387 }
9388 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9389
9390 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9391 {
9392         unsigned int reg;
9393
9394         reg = ntohl(nla_get_be32(attr));
9395         switch (reg) {
9396         case NFT_REG_VERDICT...NFT_REG_4:
9397                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9398                 break;
9399         case NFT_REG32_00...NFT_REG32_15:
9400                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9401                 break;
9402         default:
9403                 return -ERANGE;
9404         }
9405
9406         return 0;
9407 }
9408
9409 /**
9410  *      nft_dump_register - dump a register value to a netlink attribute
9411  *
9412  *      @skb: socket buffer
9413  *      @attr: attribute number
9414  *      @reg: register number
9415  *
9416  *      Construct a netlink attribute containing the register number. For
9417  *      compatibility reasons, register numbers being a multiple of 4 are
9418  *      translated to the corresponding 128 bit register numbers.
9419  */
9420 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9421 {
9422         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9423                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9424         else
9425                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9426
9427         return nla_put_be32(skb, attr, htonl(reg));
9428 }
9429 EXPORT_SYMBOL_GPL(nft_dump_register);
9430
9431 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9432 {
9433         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9434                 return -EINVAL;
9435         if (len == 0)
9436                 return -EINVAL;
9437         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9438                 return -ERANGE;
9439
9440         return 0;
9441 }
9442
9443 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9444 {
9445         u32 reg;
9446         int err;
9447
9448         err = nft_parse_register(attr, &reg);
9449         if (err < 0)
9450                 return err;
9451
9452         err = nft_validate_register_load(reg, len);
9453         if (err < 0)
9454                 return err;
9455
9456         *sreg = reg;
9457         return 0;
9458 }
9459 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9460
9461 static int nft_validate_register_store(const struct nft_ctx *ctx,
9462                                        enum nft_registers reg,
9463                                        const struct nft_data *data,
9464                                        enum nft_data_types type,
9465                                        unsigned int len)
9466 {
9467         int err;
9468
9469         switch (reg) {
9470         case NFT_REG_VERDICT:
9471                 if (type != NFT_DATA_VERDICT)
9472                         return -EINVAL;
9473
9474                 if (data != NULL &&
9475                     (data->verdict.code == NFT_GOTO ||
9476                      data->verdict.code == NFT_JUMP)) {
9477                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9478                         if (err < 0)
9479                                 return err;
9480                 }
9481
9482                 return 0;
9483         default:
9484                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9485                         return -EINVAL;
9486                 if (len == 0)
9487                         return -EINVAL;
9488                 if (reg * NFT_REG32_SIZE + len >
9489                     sizeof_field(struct nft_regs, data))
9490                         return -ERANGE;
9491
9492                 if (data != NULL && type != NFT_DATA_VALUE)
9493                         return -EINVAL;
9494                 return 0;
9495         }
9496 }
9497
9498 int nft_parse_register_store(const struct nft_ctx *ctx,
9499                              const struct nlattr *attr, u8 *dreg,
9500                              const struct nft_data *data,
9501                              enum nft_data_types type, unsigned int len)
9502 {
9503         int err;
9504         u32 reg;
9505
9506         err = nft_parse_register(attr, &reg);
9507         if (err < 0)
9508                 return err;
9509
9510         err = nft_validate_register_store(ctx, reg, data, type, len);
9511         if (err < 0)
9512                 return err;
9513
9514         *dreg = reg;
9515         return 0;
9516 }
9517 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9518
9519 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9520         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9521         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9522                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9523         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9524 };
9525
9526 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9527                             struct nft_data_desc *desc, const struct nlattr *nla)
9528 {
9529         u8 genmask = nft_genmask_next(ctx->net);
9530         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9531         struct nft_chain *chain;
9532         int err;
9533
9534         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9535                                           nft_verdict_policy, NULL);
9536         if (err < 0)
9537                 return err;
9538
9539         if (!tb[NFTA_VERDICT_CODE])
9540                 return -EINVAL;
9541         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9542
9543         switch (data->verdict.code) {
9544         default:
9545                 switch (data->verdict.code & NF_VERDICT_MASK) {
9546                 case NF_ACCEPT:
9547                 case NF_DROP:
9548                 case NF_QUEUE:
9549                         break;
9550                 default:
9551                         return -EINVAL;
9552                 }
9553                 fallthrough;
9554         case NFT_CONTINUE:
9555         case NFT_BREAK:
9556         case NFT_RETURN:
9557                 break;
9558         case NFT_JUMP:
9559         case NFT_GOTO:
9560                 if (tb[NFTA_VERDICT_CHAIN]) {
9561                         chain = nft_chain_lookup(ctx->net, ctx->table,
9562                                                  tb[NFTA_VERDICT_CHAIN],
9563                                                  genmask);
9564                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9565                         chain = nft_chain_lookup_byid(ctx->net,
9566                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9567                         if (IS_ERR(chain))
9568                                 return PTR_ERR(chain);
9569                 } else {
9570                         return -EINVAL;
9571                 }
9572
9573                 if (IS_ERR(chain))
9574                         return PTR_ERR(chain);
9575                 if (nft_is_base_chain(chain))
9576                         return -EOPNOTSUPP;
9577
9578                 chain->use++;
9579                 data->verdict.chain = chain;
9580                 break;
9581         }
9582
9583         desc->len = sizeof(data->verdict);
9584         desc->type = NFT_DATA_VERDICT;
9585         return 0;
9586 }
9587
9588 static void nft_verdict_uninit(const struct nft_data *data)
9589 {
9590         struct nft_chain *chain;
9591         struct nft_rule *rule;
9592
9593         switch (data->verdict.code) {
9594         case NFT_JUMP:
9595         case NFT_GOTO:
9596                 chain = data->verdict.chain;
9597                 chain->use--;
9598
9599                 if (!nft_chain_is_bound(chain))
9600                         break;
9601
9602                 chain->table->use--;
9603                 list_for_each_entry(rule, &chain->rules, list)
9604                         chain->use--;
9605
9606                 nft_chain_del(chain);
9607                 break;
9608         }
9609 }
9610
9611 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9612 {
9613         struct nlattr *nest;
9614
9615         nest = nla_nest_start_noflag(skb, type);
9616         if (!nest)
9617                 goto nla_put_failure;
9618
9619         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9620                 goto nla_put_failure;
9621
9622         switch (v->code) {
9623         case NFT_JUMP:
9624         case NFT_GOTO:
9625                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9626                                    v->chain->name))
9627                         goto nla_put_failure;
9628         }
9629         nla_nest_end(skb, nest);
9630         return 0;
9631
9632 nla_put_failure:
9633         return -1;
9634 }
9635
9636 static int nft_value_init(const struct nft_ctx *ctx,
9637                           struct nft_data *data, unsigned int size,
9638                           struct nft_data_desc *desc, const struct nlattr *nla)
9639 {
9640         unsigned int len;
9641
9642         len = nla_len(nla);
9643         if (len == 0)
9644                 return -EINVAL;
9645         if (len > size)
9646                 return -EOVERFLOW;
9647
9648         nla_memcpy(data->data, nla, len);
9649         desc->type = NFT_DATA_VALUE;
9650         desc->len  = len;
9651         return 0;
9652 }
9653
9654 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9655                           unsigned int len)
9656 {
9657         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9658 }
9659
9660 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9661         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9662         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9663 };
9664
9665 /**
9666  *      nft_data_init - parse nf_tables data netlink attributes
9667  *
9668  *      @ctx: context of the expression using the data
9669  *      @data: destination struct nft_data
9670  *      @size: maximum data length
9671  *      @desc: data description
9672  *      @nla: netlink attribute containing data
9673  *
9674  *      Parse the netlink data attributes and initialize a struct nft_data.
9675  *      The type and length of data are returned in the data description.
9676  *
9677  *      The caller can indicate that it only wants to accept data of type
9678  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9679  */
9680 int nft_data_init(const struct nft_ctx *ctx,
9681                   struct nft_data *data, unsigned int size,
9682                   struct nft_data_desc *desc, const struct nlattr *nla)
9683 {
9684         struct nlattr *tb[NFTA_DATA_MAX + 1];
9685         int err;
9686
9687         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9688                                           nft_data_policy, NULL);
9689         if (err < 0)
9690                 return err;
9691
9692         if (tb[NFTA_DATA_VALUE])
9693                 return nft_value_init(ctx, data, size, desc,
9694                                       tb[NFTA_DATA_VALUE]);
9695         if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9696                 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9697         return -EINVAL;
9698 }
9699 EXPORT_SYMBOL_GPL(nft_data_init);
9700
9701 /**
9702  *      nft_data_release - release a nft_data item
9703  *
9704  *      @data: struct nft_data to release
9705  *      @type: type of data
9706  *
9707  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9708  *      all others need to be released by calling this function.
9709  */
9710 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9711 {
9712         if (type < NFT_DATA_VERDICT)
9713                 return;
9714         switch (type) {
9715         case NFT_DATA_VERDICT:
9716                 return nft_verdict_uninit(data);
9717         default:
9718                 WARN_ON(1);
9719         }
9720 }
9721 EXPORT_SYMBOL_GPL(nft_data_release);
9722
9723 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9724                   enum nft_data_types type, unsigned int len)
9725 {
9726         struct nlattr *nest;
9727         int err;
9728
9729         nest = nla_nest_start_noflag(skb, attr);
9730         if (nest == NULL)
9731                 return -1;
9732
9733         switch (type) {
9734         case NFT_DATA_VALUE:
9735                 err = nft_value_dump(skb, data, len);
9736                 break;
9737         case NFT_DATA_VERDICT:
9738                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9739                 break;
9740         default:
9741                 err = -EINVAL;
9742                 WARN_ON(1);
9743         }
9744
9745         nla_nest_end(skb, nest);
9746         return err;
9747 }
9748 EXPORT_SYMBOL_GPL(nft_data_dump);
9749
9750 int __nft_release_basechain(struct nft_ctx *ctx)
9751 {
9752         struct nft_rule *rule, *nr;
9753
9754         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9755                 return 0;
9756
9757         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9758         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9759                 list_del(&rule->list);
9760                 ctx->chain->use--;
9761                 nf_tables_rule_release(ctx, rule);
9762         }
9763         nft_chain_del(ctx->chain);
9764         ctx->table->use--;
9765         nf_tables_chain_destroy(ctx);
9766
9767         return 0;
9768 }
9769 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9770
9771 static void __nft_release_hook(struct net *net, struct nft_table *table)
9772 {
9773         struct nft_flowtable *flowtable;
9774         struct nft_chain *chain;
9775
9776         list_for_each_entry(chain, &table->chains, list)
9777                 __nf_tables_unregister_hook(net, table, chain, true);
9778         list_for_each_entry(flowtable, &table->flowtables, list)
9779                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9780                                                      true);
9781 }
9782
9783 static void __nft_release_hooks(struct net *net)
9784 {
9785         struct nftables_pernet *nft_net = nft_pernet(net);
9786         struct nft_table *table;
9787
9788         list_for_each_entry(table, &nft_net->tables, list) {
9789                 if (nft_table_has_owner(table))
9790                         continue;
9791
9792                 __nft_release_hook(net, table);
9793         }
9794 }
9795
9796 static void __nft_release_table(struct net *net, struct nft_table *table)
9797 {
9798         struct nft_flowtable *flowtable, *nf;
9799         struct nft_chain *chain, *nc;
9800         struct nft_object *obj, *ne;
9801         struct nft_rule *rule, *nr;
9802         struct nft_set *set, *ns;
9803         struct nft_ctx ctx = {
9804                 .net    = net,
9805                 .family = NFPROTO_NETDEV,
9806         };
9807
9808         ctx.family = table->family;
9809         ctx.table = table;
9810         list_for_each_entry(chain, &table->chains, list) {
9811                 ctx.chain = chain;
9812                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9813                         list_del(&rule->list);
9814                         chain->use--;
9815                         nf_tables_rule_release(&ctx, rule);
9816                 }
9817         }
9818         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9819                 list_del(&flowtable->list);
9820                 table->use--;
9821                 nf_tables_flowtable_destroy(flowtable);
9822         }
9823         list_for_each_entry_safe(set, ns, &table->sets, list) {
9824                 list_del(&set->list);
9825                 table->use--;
9826                 nft_set_destroy(&ctx, set);
9827         }
9828         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9829                 nft_obj_del(obj);
9830                 table->use--;
9831                 nft_obj_destroy(&ctx, obj);
9832         }
9833         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9834                 ctx.chain = chain;
9835                 nft_chain_del(chain);
9836                 table->use--;
9837                 nf_tables_chain_destroy(&ctx);
9838         }
9839         nf_tables_table_destroy(&ctx);
9840 }
9841
9842 static void __nft_release_tables(struct net *net)
9843 {
9844         struct nftables_pernet *nft_net = nft_pernet(net);
9845         struct nft_table *table, *nt;
9846
9847         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9848                 if (nft_table_has_owner(table))
9849                         continue;
9850
9851                 list_del(&table->list);
9852
9853                 __nft_release_table(net, table);
9854         }
9855 }
9856
9857 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9858                             void *ptr)
9859 {
9860         struct nft_table *table, *to_delete[8];
9861         struct nftables_pernet *nft_net;
9862         struct netlink_notify *n = ptr;
9863         struct net *net = n->net;
9864         unsigned int deleted;
9865         bool restart = false;
9866
9867         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9868                 return NOTIFY_DONE;
9869
9870         nft_net = nft_pernet(net);
9871         deleted = 0;
9872         mutex_lock(&nft_net->commit_mutex);
9873 again:
9874         list_for_each_entry(table, &nft_net->tables, list) {
9875                 if (nft_table_has_owner(table) &&
9876                     n->portid == table->nlpid) {
9877                         __nft_release_hook(net, table);
9878                         list_del_rcu(&table->list);
9879                         to_delete[deleted++] = table;
9880                         if (deleted >= ARRAY_SIZE(to_delete))
9881                                 break;
9882                 }
9883         }
9884         if (deleted) {
9885                 restart = deleted >= ARRAY_SIZE(to_delete);
9886                 synchronize_rcu();
9887                 while (deleted)
9888                         __nft_release_table(net, to_delete[--deleted]);
9889
9890                 if (restart)
9891                         goto again;
9892         }
9893         mutex_unlock(&nft_net->commit_mutex);
9894
9895         return NOTIFY_DONE;
9896 }
9897
9898 static struct notifier_block nft_nl_notifier = {
9899         .notifier_call  = nft_rcv_nl_event,
9900 };
9901
9902 static int __net_init nf_tables_init_net(struct net *net)
9903 {
9904         struct nftables_pernet *nft_net = nft_pernet(net);
9905
9906         INIT_LIST_HEAD(&nft_net->tables);
9907         INIT_LIST_HEAD(&nft_net->commit_list);
9908         INIT_LIST_HEAD(&nft_net->module_list);
9909         INIT_LIST_HEAD(&nft_net->notify_list);
9910         mutex_init(&nft_net->commit_mutex);
9911         nft_net->base_seq = 1;
9912         nft_net->validate_state = NFT_VALIDATE_SKIP;
9913
9914         return 0;
9915 }
9916
9917 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9918 {
9919         struct nftables_pernet *nft_net = nft_pernet(net);
9920
9921         mutex_lock(&nft_net->commit_mutex);
9922         __nft_release_hooks(net);
9923         mutex_unlock(&nft_net->commit_mutex);
9924 }
9925
9926 static void __net_exit nf_tables_exit_net(struct net *net)
9927 {
9928         struct nftables_pernet *nft_net = nft_pernet(net);
9929
9930         mutex_lock(&nft_net->commit_mutex);
9931         if (!list_empty(&nft_net->commit_list))
9932                 __nf_tables_abort(net, NFNL_ABORT_NONE);
9933         __nft_release_tables(net);
9934         mutex_unlock(&nft_net->commit_mutex);
9935         WARN_ON_ONCE(!list_empty(&nft_net->tables));
9936         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9937         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9938 }
9939
9940 static struct pernet_operations nf_tables_net_ops = {
9941         .init           = nf_tables_init_net,
9942         .pre_exit       = nf_tables_pre_exit_net,
9943         .exit           = nf_tables_exit_net,
9944         .id             = &nf_tables_net_id,
9945         .size           = sizeof(struct nftables_pernet),
9946 };
9947
9948 static int __init nf_tables_module_init(void)
9949 {
9950         int err;
9951
9952         err = register_pernet_subsys(&nf_tables_net_ops);
9953         if (err < 0)
9954                 return err;
9955
9956         err = nft_chain_filter_init();
9957         if (err < 0)
9958                 goto err_chain_filter;
9959
9960         err = nf_tables_core_module_init();
9961         if (err < 0)
9962                 goto err_core_module;
9963
9964         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9965         if (err < 0)
9966                 goto err_netdev_notifier;
9967
9968         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9969         if (err < 0)
9970                 goto err_rht_objname;
9971
9972         err = nft_offload_init();
9973         if (err < 0)
9974                 goto err_offload;
9975
9976         err = netlink_register_notifier(&nft_nl_notifier);
9977         if (err < 0)
9978                 goto err_netlink_notifier;
9979
9980         /* must be last */
9981         err = nfnetlink_subsys_register(&nf_tables_subsys);
9982         if (err < 0)
9983                 goto err_nfnl_subsys;
9984
9985         nft_chain_route_init();
9986
9987         return err;
9988
9989 err_nfnl_subsys:
9990         netlink_unregister_notifier(&nft_nl_notifier);
9991 err_netlink_notifier:
9992         nft_offload_exit();
9993 err_offload:
9994         rhltable_destroy(&nft_objname_ht);
9995 err_rht_objname:
9996         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9997 err_netdev_notifier:
9998         nf_tables_core_module_exit();
9999 err_core_module:
10000         nft_chain_filter_fini();
10001 err_chain_filter:
10002         unregister_pernet_subsys(&nf_tables_net_ops);
10003         return err;
10004 }
10005
10006 static void __exit nf_tables_module_exit(void)
10007 {
10008         nfnetlink_subsys_unregister(&nf_tables_subsys);
10009         netlink_unregister_notifier(&nft_nl_notifier);
10010         nft_offload_exit();
10011         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10012         nft_chain_filter_fini();
10013         nft_chain_route_fini();
10014         unregister_pernet_subsys(&nf_tables_net_ops);
10015         cancel_work_sync(&trans_destroy_work);
10016         rcu_barrier();
10017         rhltable_destroy(&nft_objname_ht);
10018         nf_tables_core_module_exit();
10019 }
10020
10021 module_init(nf_tables_module_init);
10022 module_exit(nf_tables_module_exit);
10023
10024 MODULE_LICENSE("GPL");
10025 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10026 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);