git.itanic.dy.fi Git - linux-stable/blob - net/netfilter/nf_tables_api.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
   4  *
   5  * Development of this code funded by Astaro AG (http://www.astaro.com/)
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/list.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/netlink.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/rhashtable.h>
  15 #include <linux/audit.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nfnetlink.h>
  18 #include <linux/netfilter/nf_tables.h>
  19 #include <net/netfilter/nf_flow_table.h>
  20 #include <net/netfilter/nf_tables_core.h>
  21 #include <net/netfilter/nf_tables.h>
  22 #include <net/netfilter/nf_tables_offload.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25
  26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
  27
  28 unsigned int nf_tables_net_id __read_mostly;
  29
  30 static LIST_HEAD(nf_tables_expressions);
  31 static LIST_HEAD(nf_tables_objects);
  32 static LIST_HEAD(nf_tables_flowtables);
  33 static LIST_HEAD(nf_tables_destroy_list);
  34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
  35
  36 enum {
  37         NFT_VALIDATE_SKIP       = 0,
  38         NFT_VALIDATE_NEED,
  39         NFT_VALIDATE_DO,
  40 };
  41
  42 static struct rhltable nft_objname_ht;
  43
  44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
  45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
  46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
  47
  48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
  49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
  50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
  51
  52 static const struct rhashtable_params nft_chain_ht_params = {
  53         .head_offset            = offsetof(struct nft_chain, rhlhead),
  54         .key_offset             = offsetof(struct nft_chain, name),
  55         .hashfn                 = nft_chain_hash,
  56         .obj_hashfn             = nft_chain_hash_obj,
  57         .obj_cmpfn              = nft_chain_hash_cmp,
  58         .automatic_shrinking    = true,
  59 };
  60
  61 static const struct rhashtable_params nft_objname_ht_params = {
  62         .head_offset            = offsetof(struct nft_object, rhlhead),
  63         .key_offset             = offsetof(struct nft_object, key),
  64         .hashfn                 = nft_objname_hash,
  65         .obj_hashfn             = nft_objname_hash_obj,
  66         .obj_cmpfn              = nft_objname_hash_cmp,
  67         .automatic_shrinking    = true,
  68 };
  69
  70 struct nft_audit_data {
  71         struct nft_table *table;
  72         int entries;
  73         int op;
  74         struct list_head list;
  75 };
  76
  77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
  78         [NFT_MSG_NEWTABLE]      = AUDIT_NFT_OP_TABLE_REGISTER,
  79         [NFT_MSG_GETTABLE]      = AUDIT_NFT_OP_INVALID,
  80         [NFT_MSG_DELTABLE]      = AUDIT_NFT_OP_TABLE_UNREGISTER,
  81         [NFT_MSG_NEWCHAIN]      = AUDIT_NFT_OP_CHAIN_REGISTER,
  82         [NFT_MSG_GETCHAIN]      = AUDIT_NFT_OP_INVALID,
  83         [NFT_MSG_DELCHAIN]      = AUDIT_NFT_OP_CHAIN_UNREGISTER,
  84         [NFT_MSG_NEWRULE]       = AUDIT_NFT_OP_RULE_REGISTER,
  85         [NFT_MSG_GETRULE]       = AUDIT_NFT_OP_INVALID,
  86         [NFT_MSG_DELRULE]       = AUDIT_NFT_OP_RULE_UNREGISTER,
  87         [NFT_MSG_NEWSET]        = AUDIT_NFT_OP_SET_REGISTER,
  88         [NFT_MSG_GETSET]        = AUDIT_NFT_OP_INVALID,
  89         [NFT_MSG_DELSET]        = AUDIT_NFT_OP_SET_UNREGISTER,
  90         [NFT_MSG_NEWSETELEM]    = AUDIT_NFT_OP_SETELEM_REGISTER,
  91         [NFT_MSG_GETSETELEM]    = AUDIT_NFT_OP_INVALID,
  92         [NFT_MSG_DELSETELEM]    = AUDIT_NFT_OP_SETELEM_UNREGISTER,
  93         [NFT_MSG_NEWGEN]        = AUDIT_NFT_OP_GEN_REGISTER,
  94         [NFT_MSG_GETGEN]        = AUDIT_NFT_OP_INVALID,
  95         [NFT_MSG_TRACE]         = AUDIT_NFT_OP_INVALID,
  96         [NFT_MSG_NEWOBJ]        = AUDIT_NFT_OP_OBJ_REGISTER,
  97         [NFT_MSG_GETOBJ]        = AUDIT_NFT_OP_INVALID,
  98         [NFT_MSG_DELOBJ]        = AUDIT_NFT_OP_OBJ_UNREGISTER,
  99         [NFT_MSG_GETOBJ_RESET]  = AUDIT_NFT_OP_OBJ_RESET,
 100         [NFT_MSG_NEWFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
 101         [NFT_MSG_GETFLOWTABLE]  = AUDIT_NFT_OP_INVALID,
 102         [NFT_MSG_DELFLOWTABLE]  = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
 103 };
 104
 105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
 106 {
 107         struct nftables_pernet *nft_net = nft_pernet(net);
 108
 109         switch (nft_net->validate_state) {
 110         case NFT_VALIDATE_SKIP:
 111                 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
 112                 break;
 113         case NFT_VALIDATE_NEED:
 114                 break;
 115         case NFT_VALIDATE_DO:
 116                 if (new_validate_state == NFT_VALIDATE_NEED)
 117                         return;
 118         }
 119
 120         nft_net->validate_state = new_validate_state;
 121 }
 122 static void nf_tables_trans_destroy_work(struct work_struct *w);
 123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
 124
 125 static void nft_ctx_init(struct nft_ctx *ctx,
 126                          struct net *net,
 127                          const struct sk_buff *skb,
 128                          const struct nlmsghdr *nlh,
 129                          u8 family,
 130                          struct nft_table *table,
 131                          struct nft_chain *chain,
 132                          const struct nlattr * const *nla)
 133 {
 134         ctx->net        = net;
 135         ctx->family     = family;
 136         ctx->level      = 0;
 137         ctx->table      = table;
 138         ctx->chain      = chain;
 139         ctx->nla        = nla;
 140         ctx->portid     = NETLINK_CB(skb).portid;
 141         ctx->report     = nlmsg_report(nlh);
 142         ctx->flags      = nlh->nlmsg_flags;
 143         ctx->seq        = nlh->nlmsg_seq;
 144 }
 145
 146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
 147                                              int msg_type, u32 size, gfp_t gfp)
 148 {
 149         struct nft_trans *trans;
 150
 151         trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
 152         if (trans == NULL)
 153                 return NULL;
 154
 155         INIT_LIST_HEAD(&trans->list);
 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 = READ_ONCE(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 = ++nft_net->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 = READ_ONCE(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                 list_splice_init(&basechain->hook_list, &hook->list);
2171                 return -EOPNOTSUPP;
2172         }
2173
2174         flow_block_init(&basechain->flow_block);
2175
2176         return 0;
2177 }
2178
2179 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2180 {
2181         int err;
2182
2183         err = rhltable_insert_key(&table->chains_ht, chain->name,
2184                                   &chain->rhlhead, nft_chain_ht_params);
2185         if (err)
2186                 return err;
2187
2188         list_add_tail_rcu(&chain->list, &table->chains);
2189
2190         return 0;
2191 }
2192
2193 static u64 chain_id;
2194
2195 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2196                               u8 policy, u32 flags,
2197                               struct netlink_ext_ack *extack)
2198 {
2199         const struct nlattr * const *nla = ctx->nla;
2200         struct nft_table *table = ctx->table;
2201         struct nft_base_chain *basechain;
2202         struct net *net = ctx->net;
2203         char name[NFT_NAME_MAXLEN];
2204         struct nft_rule_blob *blob;
2205         struct nft_trans *trans;
2206         struct nft_chain *chain;
2207         unsigned int data_size;
2208         int err;
2209
2210         if (table->use == UINT_MAX)
2211                 return -EOVERFLOW;
2212
2213         if (nla[NFTA_CHAIN_HOOK]) {
2214                 struct nft_stats __percpu *stats = NULL;
2215                 struct nft_chain_hook hook;
2216
2217                 if (flags & NFT_CHAIN_BINDING)
2218                         return -EOPNOTSUPP;
2219
2220                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2221                                            true);
2222                 if (err < 0)
2223                         return err;
2224
2225                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2226                 if (basechain == NULL) {
2227                         nft_chain_release_hook(&hook);
2228                         return -ENOMEM;
2229                 }
2230                 chain = &basechain->chain;
2231
2232                 if (nla[NFTA_CHAIN_COUNTERS]) {
2233                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2234                         if (IS_ERR(stats)) {
2235                                 nft_chain_release_hook(&hook);
2236                                 kfree(basechain);
2237                                 return PTR_ERR(stats);
2238                         }
2239                         rcu_assign_pointer(basechain->stats, stats);
2240                 }
2241
2242                 err = nft_basechain_init(basechain, family, &hook, flags);
2243                 if (err < 0) {
2244                         nft_chain_release_hook(&hook);
2245                         kfree(basechain);
2246                         return err;
2247                 }
2248                 if (stats)
2249                         static_branch_inc(&nft_counters_enabled);
2250         } else {
2251                 if (flags & NFT_CHAIN_BASE)
2252                         return -EINVAL;
2253                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2254                         return -EOPNOTSUPP;
2255
2256                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2257                 if (chain == NULL)
2258                         return -ENOMEM;
2259
2260                 chain->flags = flags;
2261         }
2262         ctx->chain = chain;
2263
2264         INIT_LIST_HEAD(&chain->rules);
2265         chain->handle = nf_tables_alloc_handle(table);
2266         chain->table = table;
2267
2268         if (nla[NFTA_CHAIN_NAME]) {
2269                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2270         } else {
2271                 if (!(flags & NFT_CHAIN_BINDING)) {
2272                         err = -EINVAL;
2273                         goto err_destroy_chain;
2274                 }
2275
2276                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2277                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2278         }
2279
2280         if (!chain->name) {
2281                 err = -ENOMEM;
2282                 goto err_destroy_chain;
2283         }
2284
2285         if (nla[NFTA_CHAIN_USERDATA]) {
2286                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2287                 if (chain->udata == NULL) {
2288                         err = -ENOMEM;
2289                         goto err_destroy_chain;
2290                 }
2291                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2292         }
2293
2294         data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2295         blob = nf_tables_chain_alloc_rules(data_size);
2296         if (!blob) {
2297                 err = -ENOMEM;
2298                 goto err_destroy_chain;
2299         }
2300
2301         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2302         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2303
2304         err = nf_tables_register_hook(net, table, chain);
2305         if (err < 0)
2306                 goto err_destroy_chain;
2307
2308         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2309         if (IS_ERR(trans)) {
2310                 err = PTR_ERR(trans);
2311                 goto err_unregister_hook;
2312         }
2313
2314         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2315         if (nft_is_base_chain(chain))
2316                 nft_trans_chain_policy(trans) = policy;
2317
2318         err = nft_chain_add(table, chain);
2319         if (err < 0) {
2320                 nft_trans_destroy(trans);
2321                 goto err_unregister_hook;
2322         }
2323
2324         table->use++;
2325
2326         return 0;
2327 err_unregister_hook:
2328         nf_tables_unregister_hook(net, table, chain);
2329 err_destroy_chain:
2330         nf_tables_chain_destroy(ctx);
2331
2332         return err;
2333 }
2334
2335 static bool nft_hook_list_equal(struct list_head *hook_list1,
2336                                 struct list_head *hook_list2)
2337 {
2338         struct nft_hook *hook;
2339         int n = 0, m = 0;
2340
2341         n = 0;
2342         list_for_each_entry(hook, hook_list2, list) {
2343                 if (!nft_hook_list_find(hook_list1, hook))
2344                         return false;
2345
2346                 n++;
2347         }
2348         list_for_each_entry(hook, hook_list1, list)
2349                 m++;
2350
2351         return n == m;
2352 }
2353
2354 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2355                               u32 flags, const struct nlattr *attr,
2356                               struct netlink_ext_ack *extack)
2357 {
2358         const struct nlattr * const *nla = ctx->nla;
2359         struct nft_table *table = ctx->table;
2360         struct nft_chain *chain = ctx->chain;
2361         struct nft_base_chain *basechain;
2362         struct nft_stats *stats = NULL;
2363         struct nft_chain_hook hook;
2364         struct nf_hook_ops *ops;
2365         struct nft_trans *trans;
2366         int err;
2367
2368         if (chain->flags ^ flags)
2369                 return -EOPNOTSUPP;
2370
2371         if (nla[NFTA_CHAIN_HOOK]) {
2372                 if (!nft_is_base_chain(chain)) {
2373                         NL_SET_BAD_ATTR(extack, attr);
2374                         return -EEXIST;
2375                 }
2376                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2377                                            extack, false);
2378                 if (err < 0)
2379                         return err;
2380
2381                 basechain = nft_base_chain(chain);
2382                 if (basechain->type != hook.type) {
2383                         nft_chain_release_hook(&hook);
2384                         NL_SET_BAD_ATTR(extack, attr);
2385                         return -EEXIST;
2386                 }
2387
2388                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2389                         if (!nft_hook_list_equal(&basechain->hook_list,
2390                                                  &hook.list)) {
2391                                 nft_chain_release_hook(&hook);
2392                                 NL_SET_BAD_ATTR(extack, attr);
2393                                 return -EEXIST;
2394                         }
2395                 } else {
2396                         ops = &basechain->ops;
2397                         if (ops->hooknum != hook.num ||
2398                             ops->priority != hook.priority) {
2399                                 nft_chain_release_hook(&hook);
2400                                 NL_SET_BAD_ATTR(extack, attr);
2401                                 return -EEXIST;
2402                         }
2403                 }
2404                 nft_chain_release_hook(&hook);
2405         }
2406
2407         if (nla[NFTA_CHAIN_HANDLE] &&
2408             nla[NFTA_CHAIN_NAME]) {
2409                 struct nft_chain *chain2;
2410
2411                 chain2 = nft_chain_lookup(ctx->net, table,
2412                                           nla[NFTA_CHAIN_NAME], genmask);
2413                 if (!IS_ERR(chain2)) {
2414                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2415                         return -EEXIST;
2416                 }
2417         }
2418
2419         if (nla[NFTA_CHAIN_COUNTERS]) {
2420                 if (!nft_is_base_chain(chain))
2421                         return -EOPNOTSUPP;
2422
2423                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2424                 if (IS_ERR(stats))
2425                         return PTR_ERR(stats);
2426         }
2427
2428         err = -ENOMEM;
2429         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2430                                 sizeof(struct nft_trans_chain));
2431         if (trans == NULL)
2432                 goto err;
2433
2434         nft_trans_chain_stats(trans) = stats;
2435         nft_trans_chain_update(trans) = true;
2436
2437         if (nla[NFTA_CHAIN_POLICY])
2438                 nft_trans_chain_policy(trans) = policy;
2439         else
2440                 nft_trans_chain_policy(trans) = -1;
2441
2442         if (nla[NFTA_CHAIN_HANDLE] &&
2443             nla[NFTA_CHAIN_NAME]) {
2444                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2445                 struct nft_trans *tmp;
2446                 char *name;
2447
2448                 err = -ENOMEM;
2449                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2450                 if (!name)
2451                         goto err;
2452
2453                 err = -EEXIST;
2454                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2455                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2456                             tmp->ctx.table == table &&
2457                             nft_trans_chain_update(tmp) &&
2458                             nft_trans_chain_name(tmp) &&
2459                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2460                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2461                                 kfree(name);
2462                                 goto err;
2463                         }
2464                 }
2465
2466                 nft_trans_chain_name(trans) = name;
2467         }
2468         nft_trans_commit_list_add_tail(ctx->net, trans);
2469
2470         return 0;
2471 err:
2472         free_percpu(stats);
2473         kfree(trans);
2474         return err;
2475 }
2476
2477 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2478                                                const struct nft_table *table,
2479                                                const struct nlattr *nla)
2480 {
2481         struct nftables_pernet *nft_net = nft_pernet(net);
2482         u32 id = ntohl(nla_get_be32(nla));
2483         struct nft_trans *trans;
2484
2485         list_for_each_entry(trans, &nft_net->commit_list, list) {
2486                 struct nft_chain *chain = trans->ctx.chain;
2487
2488                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2489                     chain->table == table &&
2490                     id == nft_trans_chain_id(trans))
2491                         return chain;
2492         }
2493         return ERR_PTR(-ENOENT);
2494 }
2495
2496 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2497                               const struct nlattr * const nla[])
2498 {
2499         struct nftables_pernet *nft_net = nft_pernet(info->net);
2500         struct netlink_ext_ack *extack = info->extack;
2501         u8 genmask = nft_genmask_next(info->net);
2502         u8 family = info->nfmsg->nfgen_family;
2503         struct nft_chain *chain = NULL;
2504         struct net *net = info->net;
2505         const struct nlattr *attr;
2506         struct nft_table *table;
2507         u8 policy = NF_ACCEPT;
2508         struct nft_ctx ctx;
2509         u64 handle = 0;
2510         u32 flags = 0;
2511
2512         lockdep_assert_held(&nft_net->commit_mutex);
2513
2514         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2515                                  NETLINK_CB(skb).portid);
2516         if (IS_ERR(table)) {
2517                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2518                 return PTR_ERR(table);
2519         }
2520
2521         chain = NULL;
2522         attr = nla[NFTA_CHAIN_NAME];
2523
2524         if (nla[NFTA_CHAIN_HANDLE]) {
2525                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2526                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2527                 if (IS_ERR(chain)) {
2528                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2529                         return PTR_ERR(chain);
2530                 }
2531                 attr = nla[NFTA_CHAIN_HANDLE];
2532         } else if (nla[NFTA_CHAIN_NAME]) {
2533                 chain = nft_chain_lookup(net, table, attr, genmask);
2534                 if (IS_ERR(chain)) {
2535                         if (PTR_ERR(chain) != -ENOENT) {
2536                                 NL_SET_BAD_ATTR(extack, attr);
2537                                 return PTR_ERR(chain);
2538                         }
2539                         chain = NULL;
2540                 }
2541         } else if (!nla[NFTA_CHAIN_ID]) {
2542                 return -EINVAL;
2543         }
2544
2545         if (nla[NFTA_CHAIN_POLICY]) {
2546                 if (chain != NULL &&
2547                     !nft_is_base_chain(chain)) {
2548                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2549                         return -EOPNOTSUPP;
2550                 }
2551
2552                 if (chain == NULL &&
2553                     nla[NFTA_CHAIN_HOOK] == NULL) {
2554                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2555                         return -EOPNOTSUPP;
2556                 }
2557
2558                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2559                 switch (policy) {
2560                 case NF_DROP:
2561                 case NF_ACCEPT:
2562                         break;
2563                 default:
2564                         return -EINVAL;
2565                 }
2566         }
2567
2568         if (nla[NFTA_CHAIN_FLAGS])
2569                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2570         else if (chain)
2571                 flags = chain->flags;
2572
2573         if (flags & ~NFT_CHAIN_FLAGS)
2574                 return -EOPNOTSUPP;
2575
2576         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2577
2578         if (chain != NULL) {
2579                 if (chain->flags & NFT_CHAIN_BINDING)
2580                         return -EINVAL;
2581
2582                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2583                         NL_SET_BAD_ATTR(extack, attr);
2584                         return -EEXIST;
2585                 }
2586                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2587                         return -EOPNOTSUPP;
2588
2589                 flags |= chain->flags & NFT_CHAIN_BASE;
2590                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2591                                           extack);
2592         }
2593
2594         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2595 }
2596
2597 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2598                               const struct nlattr * const nla[])
2599 {
2600         struct netlink_ext_ack *extack = info->extack;
2601         u8 genmask = nft_genmask_next(info->net);
2602         u8 family = info->nfmsg->nfgen_family;
2603         struct net *net = info->net;
2604         const struct nlattr *attr;
2605         struct nft_table *table;
2606         struct nft_chain *chain;
2607         struct nft_rule *rule;
2608         struct nft_ctx ctx;
2609         u64 handle;
2610         u32 use;
2611         int err;
2612
2613         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2614                                  NETLINK_CB(skb).portid);
2615         if (IS_ERR(table)) {
2616                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2617                 return PTR_ERR(table);
2618         }
2619
2620         if (nla[NFTA_CHAIN_HANDLE]) {
2621                 attr = nla[NFTA_CHAIN_HANDLE];
2622                 handle = be64_to_cpu(nla_get_be64(attr));
2623                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2624         } else {
2625                 attr = nla[NFTA_CHAIN_NAME];
2626                 chain = nft_chain_lookup(net, table, attr, genmask);
2627         }
2628         if (IS_ERR(chain)) {
2629                 NL_SET_BAD_ATTR(extack, attr);
2630                 return PTR_ERR(chain);
2631         }
2632
2633         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2634             chain->use > 0)
2635                 return -EBUSY;
2636
2637         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2638
2639         use = chain->use;
2640         list_for_each_entry(rule, &chain->rules, list) {
2641                 if (!nft_is_active_next(net, rule))
2642                         continue;
2643                 use--;
2644
2645                 err = nft_delrule(&ctx, rule);
2646                 if (err < 0)
2647                         return err;
2648         }
2649
2650         /* There are rules and elements that are still holding references to us,
2651          * we cannot do a recursive removal in this case.
2652          */
2653         if (use > 0) {
2654                 NL_SET_BAD_ATTR(extack, attr);
2655                 return -EBUSY;
2656         }
2657
2658         return nft_delchain(&ctx);
2659 }
2660
2661 /*
2662  * Expressions
2663  */
2664
2665 /**
2666  *      nft_register_expr - register nf_tables expr type
2667  *      @type: expr type
2668  *
2669  *      Registers the expr type for use with nf_tables. Returns zero on
2670  *      success or a negative errno code otherwise.
2671  */
2672 int nft_register_expr(struct nft_expr_type *type)
2673 {
2674         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2675         if (type->family == NFPROTO_UNSPEC)
2676                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2677         else
2678                 list_add_rcu(&type->list, &nf_tables_expressions);
2679         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2680         return 0;
2681 }
2682 EXPORT_SYMBOL_GPL(nft_register_expr);
2683
2684 /**
2685  *      nft_unregister_expr - unregister nf_tables expr type
2686  *      @type: expr type
2687  *
2688  *      Unregisters the expr typefor use with nf_tables.
2689  */
2690 void nft_unregister_expr(struct nft_expr_type *type)
2691 {
2692         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2693         list_del_rcu(&type->list);
2694         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2695 }
2696 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2697
2698 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2699                                                        struct nlattr *nla)
2700 {
2701         const struct nft_expr_type *type, *candidate = NULL;
2702
2703         list_for_each_entry(type, &nf_tables_expressions, list) {
2704                 if (!nla_strcmp(nla, type->name)) {
2705                         if (!type->family && !candidate)
2706                                 candidate = type;
2707                         else if (type->family == family)
2708                                 candidate = type;
2709                 }
2710         }
2711         return candidate;
2712 }
2713
2714 #ifdef CONFIG_MODULES
2715 static int nft_expr_type_request_module(struct net *net, u8 family,
2716                                         struct nlattr *nla)
2717 {
2718         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2719                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2720                 return -EAGAIN;
2721
2722         return 0;
2723 }
2724 #endif
2725
2726 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2727                                                      u8 family,
2728                                                      struct nlattr *nla)
2729 {
2730         const struct nft_expr_type *type;
2731
2732         if (nla == NULL)
2733                 return ERR_PTR(-EINVAL);
2734
2735         type = __nft_expr_type_get(family, nla);
2736         if (type != NULL && try_module_get(type->owner))
2737                 return type;
2738
2739         lockdep_nfnl_nft_mutex_not_held();
2740 #ifdef CONFIG_MODULES
2741         if (type == NULL) {
2742                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2743                         return ERR_PTR(-EAGAIN);
2744
2745                 if (nft_request_module(net, "nft-expr-%.*s",
2746                                        nla_len(nla),
2747                                        (char *)nla_data(nla)) == -EAGAIN)
2748                         return ERR_PTR(-EAGAIN);
2749         }
2750 #endif
2751         return ERR_PTR(-ENOENT);
2752 }
2753
2754 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2755         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2756                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2757         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2758 };
2759
2760 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2761                                     const struct nft_expr *expr)
2762 {
2763         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2764                 goto nla_put_failure;
2765
2766         if (expr->ops->dump) {
2767                 struct nlattr *data = nla_nest_start_noflag(skb,
2768                                                             NFTA_EXPR_DATA);
2769                 if (data == NULL)
2770                         goto nla_put_failure;
2771                 if (expr->ops->dump(skb, expr) < 0)
2772                         goto nla_put_failure;
2773                 nla_nest_end(skb, data);
2774         }
2775
2776         return skb->len;
2777
2778 nla_put_failure:
2779         return -1;
2780 };
2781
2782 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2783                   const struct nft_expr *expr)
2784 {
2785         struct nlattr *nest;
2786
2787         nest = nla_nest_start_noflag(skb, attr);
2788         if (!nest)
2789                 goto nla_put_failure;
2790         if (nf_tables_fill_expr_info(skb, expr) < 0)
2791                 goto nla_put_failure;
2792         nla_nest_end(skb, nest);
2793         return 0;
2794
2795 nla_put_failure:
2796         return -1;
2797 }
2798
2799 struct nft_expr_info {
2800         const struct nft_expr_ops       *ops;
2801         const struct nlattr             *attr;
2802         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2803 };
2804
2805 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2806                                 const struct nlattr *nla,
2807                                 struct nft_expr_info *info)
2808 {
2809         const struct nft_expr_type *type;
2810         const struct nft_expr_ops *ops;
2811         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2812         int err;
2813
2814         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2815                                           nft_expr_policy, NULL);
2816         if (err < 0)
2817                 return err;
2818
2819         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2820         if (IS_ERR(type))
2821                 return PTR_ERR(type);
2822
2823         if (tb[NFTA_EXPR_DATA]) {
2824                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2825                                                   tb[NFTA_EXPR_DATA],
2826                                                   type->policy, NULL);
2827                 if (err < 0)
2828                         goto err1;
2829         } else
2830                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2831
2832         if (type->select_ops != NULL) {
2833                 ops = type->select_ops(ctx,
2834                                        (const struct nlattr * const *)info->tb);
2835                 if (IS_ERR(ops)) {
2836                         err = PTR_ERR(ops);
2837 #ifdef CONFIG_MODULES
2838                         if (err == -EAGAIN)
2839                                 if (nft_expr_type_request_module(ctx->net,
2840                                                                  ctx->family,
2841                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2842                                         err = -ENOENT;
2843 #endif
2844                         goto err1;
2845                 }
2846         } else
2847                 ops = type->ops;
2848
2849         info->attr = nla;
2850         info->ops = ops;
2851
2852         return 0;
2853
2854 err1:
2855         module_put(type->owner);
2856         return err;
2857 }
2858
2859 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2860                              const struct nft_expr_info *expr_info,
2861                              struct nft_expr *expr)
2862 {
2863         const struct nft_expr_ops *ops = expr_info->ops;
2864         int err;
2865
2866         expr->ops = ops;
2867         if (ops->init) {
2868                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2869                 if (err < 0)
2870                         goto err1;
2871         }
2872
2873         return 0;
2874 err1:
2875         expr->ops = NULL;
2876         return err;
2877 }
2878
2879 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2880                                    struct nft_expr *expr)
2881 {
2882         const struct nft_expr_type *type = expr->ops->type;
2883
2884         if (expr->ops->destroy)
2885                 expr->ops->destroy(ctx, expr);
2886         module_put(type->owner);
2887 }
2888
2889 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2890                                       const struct nlattr *nla)
2891 {
2892         struct nft_expr_info expr_info;
2893         struct nft_expr *expr;
2894         struct module *owner;
2895         int err;
2896
2897         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2898         if (err < 0)
2899                 goto err_expr_parse;
2900
2901         err = -EOPNOTSUPP;
2902         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2903                 goto err_expr_stateful;
2904
2905         err = -ENOMEM;
2906         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2907         if (expr == NULL)
2908                 goto err_expr_stateful;
2909
2910         err = nf_tables_newexpr(ctx, &expr_info, expr);
2911         if (err < 0)
2912                 goto err_expr_new;
2913
2914         return expr;
2915 err_expr_new:
2916         kfree(expr);
2917 err_expr_stateful:
2918         owner = expr_info.ops->type->owner;
2919         if (expr_info.ops->type->release_ops)
2920                 expr_info.ops->type->release_ops(expr_info.ops);
2921
2922         module_put(owner);
2923 err_expr_parse:
2924         return ERR_PTR(err);
2925 }
2926
2927 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2928 {
2929         int err;
2930
2931         if (src->ops->clone) {
2932                 dst->ops = src->ops;
2933                 err = src->ops->clone(dst, src);
2934                 if (err < 0)
2935                         return err;
2936         } else {
2937                 memcpy(dst, src, src->ops->size);
2938         }
2939
2940         __module_get(src->ops->type->owner);
2941
2942         return 0;
2943 }
2944
2945 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2946 {
2947         nf_tables_expr_destroy(ctx, expr);
2948         kfree(expr);
2949 }
2950
2951 /*
2952  * Rules
2953  */
2954
2955 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2956                                           u64 handle)
2957 {
2958         struct nft_rule *rule;
2959
2960         // FIXME: this sucks
2961         list_for_each_entry_rcu(rule, &chain->rules, list) {
2962                 if (handle == rule->handle)
2963                         return rule;
2964         }
2965
2966         return ERR_PTR(-ENOENT);
2967 }
2968
2969 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2970                                         const struct nlattr *nla)
2971 {
2972         if (nla == NULL)
2973                 return ERR_PTR(-EINVAL);
2974
2975         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2976 }
2977
2978 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2979         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
2980                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
2981         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
2982                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
2983         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
2984         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2985         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
2986         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
2987         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
2988                                     .len = NFT_USERDATA_MAXLEN },
2989         [NFTA_RULE_ID]          = { .type = NLA_U32 },
2990         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2991         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
2992 };
2993
2994 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2995                                     u32 portid, u32 seq, int event,
2996                                     u32 flags, int family,
2997                                     const struct nft_table *table,
2998                                     const struct nft_chain *chain,
2999                                     const struct nft_rule *rule, u64 handle)
3000 {
3001         struct nlmsghdr *nlh;
3002         const struct nft_expr *expr, *next;
3003         struct nlattr *list;
3004         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3005
3006         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3007                            nft_base_seq(net));
3008         if (!nlh)
3009                 goto nla_put_failure;
3010
3011         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3012                 goto nla_put_failure;
3013         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3014                 goto nla_put_failure;
3015         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3016                          NFTA_RULE_PAD))
3017                 goto nla_put_failure;
3018
3019         if (event != NFT_MSG_DELRULE && handle) {
3020                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3021                                  NFTA_RULE_PAD))
3022                         goto nla_put_failure;
3023         }
3024
3025         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3026                 nft_flow_rule_stats(chain, rule);
3027
3028         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3029         if (list == NULL)
3030                 goto nla_put_failure;
3031         nft_rule_for_each_expr(expr, next, rule) {
3032                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3033                         goto nla_put_failure;
3034         }
3035         nla_nest_end(skb, list);
3036
3037         if (rule->udata) {
3038                 struct nft_userdata *udata = nft_userdata(rule);
3039                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3040                             udata->data) < 0)
3041                         goto nla_put_failure;
3042         }
3043
3044         nlmsg_end(skb, nlh);
3045         return 0;
3046
3047 nla_put_failure:
3048         nlmsg_trim(skb, nlh);
3049         return -1;
3050 }
3051
3052 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3053                                   const struct nft_rule *rule, int event)
3054 {
3055         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3056         const struct nft_rule *prule;
3057         struct sk_buff *skb;
3058         u64 handle = 0;
3059         u16 flags = 0;
3060         int err;
3061
3062         if (!ctx->report &&
3063             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3064                 return;
3065
3066         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3067         if (skb == NULL)
3068                 goto err;
3069
3070         if (event == NFT_MSG_NEWRULE &&
3071             !list_is_first(&rule->list, &ctx->chain->rules) &&
3072             !list_is_last(&rule->list, &ctx->chain->rules)) {
3073                 prule = list_prev_entry(rule, list);
3074                 handle = prule->handle;
3075         }
3076         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3077                 flags |= NLM_F_APPEND;
3078         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3079                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3080
3081         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3082                                        event, flags, ctx->family, ctx->table,
3083                                        ctx->chain, rule, handle);
3084         if (err < 0) {
3085                 kfree_skb(skb);
3086                 goto err;
3087         }
3088
3089         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3090         return;
3091 err:
3092         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3093 }
3094
3095 struct nft_rule_dump_ctx {
3096         char *table;
3097         char *chain;
3098 };
3099
3100 static int __nf_tables_dump_rules(struct sk_buff *skb,
3101                                   unsigned int *idx,
3102                                   struct netlink_callback *cb,
3103                                   const struct nft_table *table,
3104                                   const struct nft_chain *chain)
3105 {
3106         struct net *net = sock_net(skb->sk);
3107         const struct nft_rule *rule, *prule;
3108         unsigned int s_idx = cb->args[0];
3109         u64 handle;
3110
3111         prule = NULL;
3112         list_for_each_entry_rcu(rule, &chain->rules, list) {
3113                 if (!nft_is_active(net, rule))
3114                         goto cont_skip;
3115                 if (*idx < s_idx)
3116                         goto cont;
3117                 if (*idx > s_idx) {
3118                         memset(&cb->args[1], 0,
3119                                         sizeof(cb->args) - sizeof(cb->args[0]));
3120                 }
3121                 if (prule)
3122                         handle = prule->handle;
3123                 else
3124                         handle = 0;
3125
3126                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3127                                         cb->nlh->nlmsg_seq,
3128                                         NFT_MSG_NEWRULE,
3129                                         NLM_F_MULTI | NLM_F_APPEND,
3130                                         table->family,
3131                                         table, chain, rule, handle) < 0)
3132                         return 1;
3133
3134                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3135 cont:
3136                 prule = rule;
3137 cont_skip:
3138                 (*idx)++;
3139         }
3140         return 0;
3141 }
3142
3143 static int nf_tables_dump_rules(struct sk_buff *skb,
3144                                 struct netlink_callback *cb)
3145 {
3146         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3147         const struct nft_rule_dump_ctx *ctx = cb->data;
3148         struct nft_table *table;
3149         const struct nft_chain *chain;
3150         unsigned int idx = 0;
3151         struct net *net = sock_net(skb->sk);
3152         int family = nfmsg->nfgen_family;
3153         struct nftables_pernet *nft_net;
3154
3155         rcu_read_lock();
3156         nft_net = nft_pernet(net);
3157         cb->seq = READ_ONCE(nft_net->base_seq);
3158
3159         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3160                 if (family != NFPROTO_UNSPEC && family != table->family)
3161                         continue;
3162
3163                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3164                         continue;
3165
3166                 if (ctx && ctx->table && ctx->chain) {
3167                         struct rhlist_head *list, *tmp;
3168
3169                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3170                                                nft_chain_ht_params);
3171                         if (!list)
3172                                 goto done;
3173
3174                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3175                                 if (!nft_is_active(net, chain))
3176                                         continue;
3177                                 __nf_tables_dump_rules(skb, &idx,
3178                                                        cb, table, chain);
3179                                 break;
3180                         }
3181                         goto done;
3182                 }
3183
3184                 list_for_each_entry_rcu(chain, &table->chains, list) {
3185                         if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3186                                 goto done;
3187                 }
3188
3189                 if (ctx && ctx->table)
3190                         break;
3191         }
3192 done:
3193         rcu_read_unlock();
3194
3195         cb->args[0] = idx;
3196         return skb->len;
3197 }
3198
3199 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3200 {
3201         const struct nlattr * const *nla = cb->data;
3202         struct nft_rule_dump_ctx *ctx = NULL;
3203
3204         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3205                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3206                 if (!ctx)
3207                         return -ENOMEM;
3208
3209                 if (nla[NFTA_RULE_TABLE]) {
3210                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3211                                                         GFP_ATOMIC);
3212                         if (!ctx->table) {
3213                                 kfree(ctx);
3214                                 return -ENOMEM;
3215                         }
3216                 }
3217                 if (nla[NFTA_RULE_CHAIN]) {
3218                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3219                                                 GFP_ATOMIC);
3220                         if (!ctx->chain) {
3221                                 kfree(ctx->table);
3222                                 kfree(ctx);
3223                                 return -ENOMEM;
3224                         }
3225                 }
3226         }
3227
3228         cb->data = ctx;
3229         return 0;
3230 }
3231
3232 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3233 {
3234         struct nft_rule_dump_ctx *ctx = cb->data;
3235
3236         if (ctx) {
3237                 kfree(ctx->table);
3238                 kfree(ctx->chain);
3239                 kfree(ctx);
3240         }
3241         return 0;
3242 }
3243
3244 /* called with rcu_read_lock held */
3245 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3246                              const struct nlattr * const nla[])
3247 {
3248         struct netlink_ext_ack *extack = info->extack;
3249         u8 genmask = nft_genmask_cur(info->net);
3250         u8 family = info->nfmsg->nfgen_family;
3251         const struct nft_chain *chain;
3252         const struct nft_rule *rule;
3253         struct net *net = info->net;
3254         struct nft_table *table;
3255         struct sk_buff *skb2;
3256         int err;
3257
3258         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3259                 struct netlink_dump_control c = {
3260                         .start= nf_tables_dump_rules_start,
3261                         .dump = nf_tables_dump_rules,
3262                         .done = nf_tables_dump_rules_done,
3263                         .module = THIS_MODULE,
3264                         .data = (void *)nla,
3265                 };
3266
3267                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3268         }
3269
3270         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3271         if (IS_ERR(table)) {
3272                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3273                 return PTR_ERR(table);
3274         }
3275
3276         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3277         if (IS_ERR(chain)) {
3278                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3279                 return PTR_ERR(chain);
3280         }
3281
3282         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3283         if (IS_ERR(rule)) {
3284                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3285                 return PTR_ERR(rule);
3286         }
3287
3288         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3289         if (!skb2)
3290                 return -ENOMEM;
3291
3292         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3293                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3294                                        family, table, chain, rule, 0);
3295         if (err < 0)
3296                 goto err_fill_rule_info;
3297
3298         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3299
3300 err_fill_rule_info:
3301         kfree_skb(skb2);
3302         return err;
3303 }
3304
3305 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3306                                    struct nft_rule *rule)
3307 {
3308         struct nft_expr *expr, *next;
3309
3310         /*
3311          * Careful: some expressions might not be initialized in case this
3312          * is called on error from nf_tables_newrule().
3313          */
3314         expr = nft_expr_first(rule);
3315         while (nft_expr_more(rule, expr)) {
3316                 next = nft_expr_next(expr);
3317                 nf_tables_expr_destroy(ctx, expr);
3318                 expr = next;
3319         }
3320         kfree(rule);
3321 }
3322
3323 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3324 {
3325         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3326         nf_tables_rule_destroy(ctx, rule);
3327 }
3328
3329 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3330 {
3331         struct nft_expr *expr, *last;
3332         const struct nft_data *data;
3333         struct nft_rule *rule;
3334         int err;
3335
3336         if (ctx->level == NFT_JUMP_STACK_SIZE)
3337                 return -EMLINK;
3338
3339         list_for_each_entry(rule, &chain->rules, list) {
3340                 if (!nft_is_active_next(ctx->net, rule))
3341                         continue;
3342
3343                 nft_rule_for_each_expr(expr, last, rule) {
3344                         if (!expr->ops->validate)
3345                                 continue;
3346
3347                         err = expr->ops->validate(ctx, expr, &data);
3348                         if (err < 0)
3349                                 return err;
3350                 }
3351
3352                 cond_resched();
3353         }
3354
3355         return 0;
3356 }
3357 EXPORT_SYMBOL_GPL(nft_chain_validate);
3358
3359 static int nft_table_validate(struct net *net, const struct nft_table *table)
3360 {
3361         struct nft_chain *chain;
3362         struct nft_ctx ctx = {
3363                 .net    = net,
3364                 .family = table->family,
3365         };
3366         int err;
3367
3368         list_for_each_entry(chain, &table->chains, list) {
3369                 if (!nft_is_base_chain(chain))
3370                         continue;
3371
3372                 ctx.chain = chain;
3373                 err = nft_chain_validate(&ctx, chain);
3374                 if (err < 0)
3375                         return err;
3376         }
3377
3378         return 0;
3379 }
3380
3381 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3382                                              const struct nft_chain *chain,
3383                                              const struct nlattr *nla);
3384
3385 #define NFT_RULE_MAXEXPRS       128
3386
3387 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3388                              const struct nlattr * const nla[])
3389 {
3390         struct nftables_pernet *nft_net = nft_pernet(info->net);
3391         struct netlink_ext_ack *extack = info->extack;
3392         unsigned int size, i, n, ulen = 0, usize = 0;
3393         u8 genmask = nft_genmask_next(info->net);
3394         struct nft_rule *rule, *old_rule = NULL;
3395         struct nft_expr_info *expr_info = NULL;
3396         u8 family = info->nfmsg->nfgen_family;
3397         struct nft_flow_rule *flow = NULL;
3398         struct net *net = info->net;
3399         struct nft_userdata *udata;
3400         struct nft_table *table;
3401         struct nft_chain *chain;
3402         struct nft_trans *trans;
3403         u64 handle, pos_handle;
3404         struct nft_expr *expr;
3405         struct nft_ctx ctx;
3406         struct nlattr *tmp;
3407         int err, rem;
3408
3409         lockdep_assert_held(&nft_net->commit_mutex);
3410
3411         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3412                                  NETLINK_CB(skb).portid);
3413         if (IS_ERR(table)) {
3414                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3415                 return PTR_ERR(table);
3416         }
3417
3418         if (nla[NFTA_RULE_CHAIN]) {
3419                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3420                                          genmask);
3421                 if (IS_ERR(chain)) {
3422                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3423                         return PTR_ERR(chain);
3424                 }
3425                 if (nft_chain_is_bound(chain))
3426                         return -EOPNOTSUPP;
3427
3428         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3429                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3430                 if (IS_ERR(chain)) {
3431                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3432                         return PTR_ERR(chain);
3433                 }
3434         } else {
3435                 return -EINVAL;
3436         }
3437
3438         if (nla[NFTA_RULE_HANDLE]) {
3439                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3440                 rule = __nft_rule_lookup(chain, handle);
3441                 if (IS_ERR(rule)) {
3442                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3443                         return PTR_ERR(rule);
3444                 }
3445
3446                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3447                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3448                         return -EEXIST;
3449                 }
3450                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3451                         old_rule = rule;
3452                 else
3453                         return -EOPNOTSUPP;
3454         } else {
3455                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3456                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3457                         return -EINVAL;
3458                 handle = nf_tables_alloc_handle(table);
3459
3460                 if (chain->use == UINT_MAX)
3461                         return -EOVERFLOW;
3462
3463                 if (nla[NFTA_RULE_POSITION]) {
3464                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3465                         old_rule = __nft_rule_lookup(chain, pos_handle);
3466                         if (IS_ERR(old_rule)) {
3467                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3468                                 return PTR_ERR(old_rule);
3469                         }
3470                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3471                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3472                         if (IS_ERR(old_rule)) {
3473                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3474                                 return PTR_ERR(old_rule);
3475                         }
3476                 }
3477         }
3478
3479         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3480
3481         n = 0;
3482         size = 0;
3483         if (nla[NFTA_RULE_EXPRESSIONS]) {
3484                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3485                                            sizeof(struct nft_expr_info),
3486                                            GFP_KERNEL);
3487                 if (!expr_info)
3488                         return -ENOMEM;
3489
3490                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3491                         err = -EINVAL;
3492                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3493                                 goto err_release_expr;
3494                         if (n == NFT_RULE_MAXEXPRS)
3495                                 goto err_release_expr;
3496                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3497                         if (err < 0) {
3498                                 NL_SET_BAD_ATTR(extack, tmp);
3499                                 goto err_release_expr;
3500                         }
3501                         size += expr_info[n].ops->size;
3502                         n++;
3503                 }
3504         }
3505         /* Check for overflow of dlen field */
3506         err = -EFBIG;
3507         if (size >= 1 << 12)
3508                 goto err_release_expr;
3509
3510         if (nla[NFTA_RULE_USERDATA]) {
3511                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3512                 if (ulen > 0)
3513                         usize = sizeof(struct nft_userdata) + ulen;
3514         }
3515
3516         err = -ENOMEM;
3517         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3518         if (rule == NULL)
3519                 goto err_release_expr;
3520
3521         nft_activate_next(net, rule);
3522
3523         rule->handle = handle;
3524         rule->dlen   = size;
3525         rule->udata  = ulen ? 1 : 0;
3526
3527         if (ulen) {
3528                 udata = nft_userdata(rule);
3529                 udata->len = ulen - 1;
3530                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3531         }
3532
3533         expr = nft_expr_first(rule);
3534         for (i = 0; i < n; i++) {
3535                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3536                 if (err < 0) {
3537                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3538                         goto err_release_rule;
3539                 }
3540
3541                 if (expr_info[i].ops->validate)
3542                         nft_validate_state_update(net, NFT_VALIDATE_NEED);
3543
3544                 expr_info[i].ops = NULL;
3545                 expr = nft_expr_next(expr);
3546         }
3547
3548         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3549                 flow = nft_flow_rule_create(net, rule);
3550                 if (IS_ERR(flow)) {
3551                         err = PTR_ERR(flow);
3552                         goto err_release_rule;
3553                 }
3554         }
3555
3556         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3557                 err = nft_delrule(&ctx, old_rule);
3558                 if (err < 0)
3559                         goto err_destroy_flow_rule;
3560
3561                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3562                 if (trans == NULL) {
3563                         err = -ENOMEM;
3564                         goto err_destroy_flow_rule;
3565                 }
3566                 list_add_tail_rcu(&rule->list, &old_rule->list);
3567         } else {
3568                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3569                 if (!trans) {
3570                         err = -ENOMEM;
3571                         goto err_destroy_flow_rule;
3572                 }
3573
3574                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3575                         if (old_rule)
3576                                 list_add_rcu(&rule->list, &old_rule->list);
3577                         else
3578                                 list_add_tail_rcu(&rule->list, &chain->rules);
3579                  } else {
3580                         if (old_rule)
3581                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3582                         else
3583                                 list_add_rcu(&rule->list, &chain->rules);
3584                 }
3585         }
3586         kvfree(expr_info);
3587         chain->use++;
3588
3589         if (flow)
3590                 nft_trans_flow_rule(trans) = flow;
3591
3592         if (nft_net->validate_state == NFT_VALIDATE_DO)
3593                 return nft_table_validate(net, table);
3594
3595         return 0;
3596
3597 err_destroy_flow_rule:
3598         if (flow)
3599                 nft_flow_rule_destroy(flow);
3600 err_release_rule:
3601         nf_tables_rule_release(&ctx, rule);
3602 err_release_expr:
3603         for (i = 0; i < n; i++) {
3604                 if (expr_info[i].ops) {
3605                         module_put(expr_info[i].ops->type->owner);
3606                         if (expr_info[i].ops->type->release_ops)
3607                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3608                 }
3609         }
3610         kvfree(expr_info);
3611
3612         return err;
3613 }
3614
3615 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3616                                              const struct nft_chain *chain,
3617                                              const struct nlattr *nla)
3618 {
3619         struct nftables_pernet *nft_net = nft_pernet(net);
3620         u32 id = ntohl(nla_get_be32(nla));
3621         struct nft_trans *trans;
3622
3623         list_for_each_entry(trans, &nft_net->commit_list, list) {
3624                 struct nft_rule *rule = nft_trans_rule(trans);
3625
3626                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3627                     trans->ctx.chain == chain &&
3628                     id == nft_trans_rule_id(trans))
3629                         return rule;
3630         }
3631         return ERR_PTR(-ENOENT);
3632 }
3633
3634 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3635                              const struct nlattr * const nla[])
3636 {
3637         struct netlink_ext_ack *extack = info->extack;
3638         u8 genmask = nft_genmask_next(info->net);
3639         u8 family = info->nfmsg->nfgen_family;
3640         struct nft_chain *chain = NULL;
3641         struct net *net = info->net;
3642         struct nft_table *table;
3643         struct nft_rule *rule;
3644         struct nft_ctx ctx;
3645         int err = 0;
3646
3647         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3648                                  NETLINK_CB(skb).portid);
3649         if (IS_ERR(table)) {
3650                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3651                 return PTR_ERR(table);
3652         }
3653
3654         if (nla[NFTA_RULE_CHAIN]) {
3655                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3656                                          genmask);
3657                 if (IS_ERR(chain)) {
3658                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3659                         return PTR_ERR(chain);
3660                 }
3661                 if (nft_chain_is_bound(chain))
3662                         return -EOPNOTSUPP;
3663         }
3664
3665         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3666
3667         if (chain) {
3668                 if (nla[NFTA_RULE_HANDLE]) {
3669                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3670                         if (IS_ERR(rule)) {
3671                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3672                                 return PTR_ERR(rule);
3673                         }
3674
3675                         err = nft_delrule(&ctx, rule);
3676                 } else if (nla[NFTA_RULE_ID]) {
3677                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3678                         if (IS_ERR(rule)) {
3679                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3680                                 return PTR_ERR(rule);
3681                         }
3682
3683                         err = nft_delrule(&ctx, rule);
3684                 } else {
3685                         err = nft_delrule_by_chain(&ctx);
3686                 }
3687         } else {
3688                 list_for_each_entry(chain, &table->chains, list) {
3689                         if (!nft_is_active_next(net, chain))
3690                                 continue;
3691
3692                         ctx.chain = chain;
3693                         err = nft_delrule_by_chain(&ctx);
3694                         if (err < 0)
3695                                 break;
3696                 }
3697         }
3698
3699         return err;
3700 }
3701
3702 /*
3703  * Sets
3704  */
3705 static const struct nft_set_type *nft_set_types[] = {
3706         &nft_set_hash_fast_type,
3707         &nft_set_hash_type,
3708         &nft_set_rhash_type,
3709         &nft_set_bitmap_type,
3710         &nft_set_rbtree_type,
3711 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3712         &nft_set_pipapo_avx2_type,
3713 #endif
3714         &nft_set_pipapo_type,
3715 };
3716
3717 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3718                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3719                                  NFT_SET_EVAL)
3720
3721 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3722 {
3723         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3724 }
3725
3726 /*
3727  * Select a set implementation based on the data characteristics and the
3728  * given policy. The total memory use might not be known if no size is
3729  * given, in that case the amount of memory per element is used.
3730  */
3731 static const struct nft_set_ops *
3732 nft_select_set_ops(const struct nft_ctx *ctx,
3733                    const struct nlattr * const nla[],
3734                    const struct nft_set_desc *desc,
3735                    enum nft_set_policies policy)
3736 {
3737         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3738         const struct nft_set_ops *ops, *bops;
3739         struct nft_set_estimate est, best;
3740         const struct nft_set_type *type;
3741         u32 flags = 0;
3742         int i;
3743
3744         lockdep_assert_held(&nft_net->commit_mutex);
3745         lockdep_nfnl_nft_mutex_not_held();
3746
3747         if (nla[NFTA_SET_FLAGS] != NULL)
3748                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3749
3750         bops        = NULL;
3751         best.size   = ~0;
3752         best.lookup = ~0;
3753         best.space  = ~0;
3754
3755         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3756                 type = nft_set_types[i];
3757                 ops = &type->ops;
3758
3759                 if (!nft_set_ops_candidate(type, flags))
3760                         continue;
3761                 if (!ops->estimate(desc, flags, &est))
3762                         continue;
3763
3764                 switch (policy) {
3765                 case NFT_SET_POL_PERFORMANCE:
3766                         if (est.lookup < best.lookup)
3767                                 break;
3768                         if (est.lookup == best.lookup &&
3769                             est.space < best.space)
3770                                 break;
3771                         continue;
3772                 case NFT_SET_POL_MEMORY:
3773                         if (!desc->size) {
3774                                 if (est.space < best.space)
3775                                         break;
3776                                 if (est.space == best.space &&
3777                                     est.lookup < best.lookup)
3778                                         break;
3779                         } else if (est.size < best.size || !bops) {
3780                                 break;
3781                         }
3782                         continue;
3783                 default:
3784                         break;
3785                 }
3786
3787                 bops = ops;
3788                 best = est;
3789         }
3790
3791         if (bops != NULL)
3792                 return bops;
3793
3794         return ERR_PTR(-EOPNOTSUPP);
3795 }
3796
3797 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3798         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3799                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3800         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3801                                             .len = NFT_SET_MAXNAMELEN - 1 },
3802         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3803         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3804         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3805         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3806         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3807         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3808         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3809         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3810         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3811         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3812         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3813                                             .len  = NFT_USERDATA_MAXLEN },
3814         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3815         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3816         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3817         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3818 };
3819
3820 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3821         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3822         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3823 };
3824
3825 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3826                                       const struct nlattr *nla, u8 genmask)
3827 {
3828         struct nft_set *set;
3829
3830         if (nla == NULL)
3831                 return ERR_PTR(-EINVAL);
3832
3833         list_for_each_entry_rcu(set, &table->sets, list) {
3834                 if (!nla_strcmp(nla, set->name) &&
3835                     nft_active_genmask(set, genmask))
3836                         return set;
3837         }
3838         return ERR_PTR(-ENOENT);
3839 }
3840
3841 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3842                                                const struct nlattr *nla,
3843                                                u8 genmask)
3844 {
3845         struct nft_set *set;
3846
3847         list_for_each_entry(set, &table->sets, list) {
3848                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3849                     nft_active_genmask(set, genmask))
3850                         return set;
3851         }
3852         return ERR_PTR(-ENOENT);
3853 }
3854
3855 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3856                                            const struct nft_table *table,
3857                                            const struct nlattr *nla, u8 genmask)
3858 {
3859         struct nftables_pernet *nft_net = nft_pernet(net);
3860         u32 id = ntohl(nla_get_be32(nla));
3861         struct nft_trans *trans;
3862
3863         list_for_each_entry(trans, &nft_net->commit_list, list) {
3864                 if (trans->msg_type == NFT_MSG_NEWSET) {
3865                         struct nft_set *set = nft_trans_set(trans);
3866
3867                         if (id == nft_trans_set_id(trans) &&
3868                             set->table == table &&
3869                             nft_active_genmask(set, genmask))
3870                                 return set;
3871                 }
3872         }
3873         return ERR_PTR(-ENOENT);
3874 }
3875
3876 struct nft_set *nft_set_lookup_global(const struct net *net,
3877                                       const struct nft_table *table,
3878                                       const struct nlattr *nla_set_name,
3879                                       const struct nlattr *nla_set_id,
3880                                       u8 genmask)
3881 {
3882         struct nft_set *set;
3883
3884         set = nft_set_lookup(table, nla_set_name, genmask);
3885         if (IS_ERR(set)) {
3886                 if (!nla_set_id)
3887                         return set;
3888
3889                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3890         }
3891         return set;
3892 }
3893 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3894
3895 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3896                                     const char *name)
3897 {
3898         const struct nft_set *i;
3899         const char *p;
3900         unsigned long *inuse;
3901         unsigned int n = 0, min = 0;
3902
3903         p = strchr(name, '%');
3904         if (p != NULL) {
3905                 if (p[1] != 'd' || strchr(p + 2, '%'))
3906                         return -EINVAL;
3907
3908                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3909                 if (inuse == NULL)
3910                         return -ENOMEM;
3911 cont:
3912                 list_for_each_entry(i, &ctx->table->sets, list) {
3913                         int tmp;
3914
3915                         if (!nft_is_active_next(ctx->net, i))
3916                                 continue;
3917                         if (!sscanf(i->name, name, &tmp))
3918                                 continue;
3919                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3920                                 continue;
3921
3922                         set_bit(tmp - min, inuse);
3923                 }
3924
3925                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3926                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3927                         min += BITS_PER_BYTE * PAGE_SIZE;
3928                         memset(inuse, 0, PAGE_SIZE);
3929                         goto cont;
3930                 }
3931                 free_page((unsigned long)inuse);
3932         }
3933
3934         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3935         if (!set->name)
3936                 return -ENOMEM;
3937
3938         list_for_each_entry(i, &ctx->table->sets, list) {
3939                 if (!nft_is_active_next(ctx->net, i))
3940                         continue;
3941                 if (!strcmp(set->name, i->name)) {
3942                         kfree(set->name);
3943                         set->name = NULL;
3944                         return -ENFILE;
3945                 }
3946         }
3947         return 0;
3948 }
3949
3950 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3951 {
3952         u64 ms = be64_to_cpu(nla_get_be64(nla));
3953         u64 max = (u64)(~((u64)0));
3954
3955         max = div_u64(max, NSEC_PER_MSEC);
3956         if (ms >= max)
3957                 return -ERANGE;
3958
3959         ms *= NSEC_PER_MSEC;
3960         *result = nsecs_to_jiffies64(ms);
3961         return 0;
3962 }
3963
3964 __be64 nf_jiffies64_to_msecs(u64 input)
3965 {
3966         return cpu_to_be64(jiffies64_to_msecs(input));
3967 }
3968
3969 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3970                                      const struct nft_set *set)
3971 {
3972         struct nlattr *concat, *field;
3973         int i;
3974
3975         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3976         if (!concat)
3977                 return -ENOMEM;
3978
3979         for (i = 0; i < set->field_count; i++) {
3980                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3981                 if (!field)
3982                         return -ENOMEM;
3983
3984                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3985                                  htonl(set->field_len[i])))
3986                         return -ENOMEM;
3987
3988                 nla_nest_end(skb, field);
3989         }
3990
3991         nla_nest_end(skb, concat);
3992
3993         return 0;
3994 }
3995
3996 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3997                               const struct nft_set *set, u16 event, u16 flags)
3998 {
3999         struct nlmsghdr *nlh;
4000         u32 portid = ctx->portid;
4001         struct nlattr *nest;
4002         u32 seq = ctx->seq;
4003         int i;
4004
4005         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4006         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4007                            NFNETLINK_V0, nft_base_seq(ctx->net));
4008         if (!nlh)
4009                 goto nla_put_failure;
4010
4011         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4012                 goto nla_put_failure;
4013         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4014                 goto nla_put_failure;
4015         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4016                          NFTA_SET_PAD))
4017                 goto nla_put_failure;
4018         if (set->flags != 0)
4019                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4020                         goto nla_put_failure;
4021
4022         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4023                 goto nla_put_failure;
4024         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4025                 goto nla_put_failure;
4026         if (set->flags & NFT_SET_MAP) {
4027                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4028                         goto nla_put_failure;
4029                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4030                         goto nla_put_failure;
4031         }
4032         if (set->flags & NFT_SET_OBJECT &&
4033             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4034                 goto nla_put_failure;
4035
4036         if (set->timeout &&
4037             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4038                          nf_jiffies64_to_msecs(set->timeout),
4039                          NFTA_SET_PAD))
4040                 goto nla_put_failure;
4041         if (set->gc_int &&
4042             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4043                 goto nla_put_failure;
4044
4045         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4046                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4047                         goto nla_put_failure;
4048         }
4049
4050         if (set->udata &&
4051             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4052                 goto nla_put_failure;
4053
4054         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4055         if (!nest)
4056                 goto nla_put_failure;
4057         if (set->size &&
4058             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4059                 goto nla_put_failure;
4060
4061         if (set->field_count > 1 &&
4062             nf_tables_fill_set_concat(skb, set))
4063                 goto nla_put_failure;
4064
4065         nla_nest_end(skb, nest);
4066
4067         if (set->num_exprs == 1) {
4068                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4069                 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4070                         goto nla_put_failure;
4071
4072                 nla_nest_end(skb, nest);
4073         } else if (set->num_exprs > 1) {
4074                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4075                 if (nest == NULL)
4076                         goto nla_put_failure;
4077
4078                 for (i = 0; i < set->num_exprs; i++) {
4079                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4080                                           set->exprs[i]) < 0)
4081                                 goto nla_put_failure;
4082                 }
4083                 nla_nest_end(skb, nest);
4084         }
4085
4086         nlmsg_end(skb, nlh);
4087         return 0;
4088
4089 nla_put_failure:
4090         nlmsg_trim(skb, nlh);
4091         return -1;
4092 }
4093
4094 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4095                                  const struct nft_set *set, int event,
4096                                  gfp_t gfp_flags)
4097 {
4098         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4099         u32 portid = ctx->portid;
4100         struct sk_buff *skb;
4101         u16 flags = 0;
4102         int err;
4103
4104         if (!ctx->report &&
4105             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4106                 return;
4107
4108         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4109         if (skb == NULL)
4110                 goto err;
4111
4112         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4113                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4114
4115         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4116         if (err < 0) {
4117                 kfree_skb(skb);
4118                 goto err;
4119         }
4120
4121         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4122         return;
4123 err:
4124         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4125 }
4126
4127 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4128 {
4129         const struct nft_set *set;
4130         unsigned int idx, s_idx = cb->args[0];
4131         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4132         struct net *net = sock_net(skb->sk);
4133         struct nft_ctx *ctx = cb->data, ctx_set;
4134         struct nftables_pernet *nft_net;
4135
4136         if (cb->args[1])
4137                 return skb->len;
4138
4139         rcu_read_lock();
4140         nft_net = nft_pernet(net);
4141         cb->seq = READ_ONCE(nft_net->base_seq);
4142
4143         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4144                 if (ctx->family != NFPROTO_UNSPEC &&
4145                     ctx->family != table->family)
4146                         continue;
4147
4148                 if (ctx->table && ctx->table != table)
4149                         continue;
4150
4151                 if (cur_table) {
4152                         if (cur_table != table)
4153                                 continue;
4154
4155                         cur_table = NULL;
4156                 }
4157                 idx = 0;
4158                 list_for_each_entry_rcu(set, &table->sets, list) {
4159                         if (idx < s_idx)
4160                                 goto cont;
4161                         if (!nft_is_active(net, set))
4162                                 goto cont;
4163
4164                         ctx_set = *ctx;
4165                         ctx_set.table = table;
4166                         ctx_set.family = table->family;
4167
4168                         if (nf_tables_fill_set(skb, &ctx_set, set,
4169                                                NFT_MSG_NEWSET,
4170                                                NLM_F_MULTI) < 0) {
4171                                 cb->args[0] = idx;
4172                                 cb->args[2] = (unsigned long) table;
4173                                 goto done;
4174                         }
4175                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4176 cont:
4177                         idx++;
4178                 }
4179                 if (s_idx)
4180                         s_idx = 0;
4181         }
4182         cb->args[1] = 1;
4183 done:
4184         rcu_read_unlock();
4185         return skb->len;
4186 }
4187
4188 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4189 {
4190         struct nft_ctx *ctx_dump = NULL;
4191
4192         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4193         if (ctx_dump == NULL)
4194                 return -ENOMEM;
4195
4196         cb->data = ctx_dump;
4197         return 0;
4198 }
4199
4200 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4201 {
4202         kfree(cb->data);
4203         return 0;
4204 }
4205
4206 /* called with rcu_read_lock held */
4207 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4208                             const struct nlattr * const nla[])
4209 {
4210         struct netlink_ext_ack *extack = info->extack;
4211         u8 genmask = nft_genmask_cur(info->net);
4212         u8 family = info->nfmsg->nfgen_family;
4213         struct nft_table *table = NULL;
4214         struct net *net = info->net;
4215         const struct nft_set *set;
4216         struct sk_buff *skb2;
4217         struct nft_ctx ctx;
4218         int err;
4219
4220         if (nla[NFTA_SET_TABLE]) {
4221                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4222                                          genmask, 0);
4223                 if (IS_ERR(table)) {
4224                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4225                         return PTR_ERR(table);
4226                 }
4227         }
4228
4229         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4230
4231         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4232                 struct netlink_dump_control c = {
4233                         .start = nf_tables_dump_sets_start,
4234                         .dump = nf_tables_dump_sets,
4235                         .done = nf_tables_dump_sets_done,
4236                         .data = &ctx,
4237                         .module = THIS_MODULE,
4238                 };
4239
4240                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4241         }
4242
4243         /* Only accept unspec with dump */
4244         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4245                 return -EAFNOSUPPORT;
4246         if (!nla[NFTA_SET_TABLE])
4247                 return -EINVAL;
4248
4249         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4250         if (IS_ERR(set))
4251                 return PTR_ERR(set);
4252
4253         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4254         if (skb2 == NULL)
4255                 return -ENOMEM;
4256
4257         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4258         if (err < 0)
4259                 goto err_fill_set_info;
4260
4261         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4262
4263 err_fill_set_info:
4264         kfree_skb(skb2);
4265         return err;
4266 }
4267
4268 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4269         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4270 };
4271
4272 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4273                                      struct nft_set_desc *desc)
4274 {
4275         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4276         u32 len;
4277         int err;
4278
4279         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4280                 return -E2BIG;
4281
4282         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4283                                           nft_concat_policy, NULL);
4284         if (err < 0)
4285                 return err;
4286
4287         if (!tb[NFTA_SET_FIELD_LEN])
4288                 return -EINVAL;
4289
4290         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4291         if (!len || len > U8_MAX)
4292                 return -EINVAL;
4293
4294         desc->field_len[desc->field_count++] = len;
4295
4296         return 0;
4297 }
4298
4299 static int nft_set_desc_concat(struct nft_set_desc *desc,
4300                                const struct nlattr *nla)
4301 {
4302         struct nlattr *attr;
4303         u32 num_regs = 0;
4304         int rem, err, i;
4305
4306         nla_for_each_nested(attr, nla, rem) {
4307                 if (nla_type(attr) != NFTA_LIST_ELEM)
4308                         return -EINVAL;
4309
4310                 err = nft_set_desc_concat_parse(attr, desc);
4311                 if (err < 0)
4312                         return err;
4313         }
4314
4315         for (i = 0; i < desc->field_count; i++)
4316                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4317
4318         if (num_regs > NFT_REG32_COUNT)
4319                 return -E2BIG;
4320
4321         return 0;
4322 }
4323
4324 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4325                                     const struct nlattr *nla)
4326 {
4327         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4328         int err;
4329
4330         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4331                                           nft_set_desc_policy, NULL);
4332         if (err < 0)
4333                 return err;
4334
4335         if (da[NFTA_SET_DESC_SIZE] != NULL)
4336                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4337         if (da[NFTA_SET_DESC_CONCAT])
4338                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4339
4340         return err;
4341 }
4342
4343 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4344                             const struct nlattr * const nla[])
4345 {
4346         u32 ktype, dtype, flags, policy, gc_int, objtype;
4347         struct netlink_ext_ack *extack = info->extack;
4348         u8 genmask = nft_genmask_next(info->net);
4349         u8 family = info->nfmsg->nfgen_family;
4350         const struct nft_set_ops *ops;
4351         struct nft_expr *expr = NULL;
4352         struct net *net = info->net;
4353         struct nft_set_desc desc;
4354         struct nft_table *table;
4355         unsigned char *udata;
4356         struct nft_set *set;
4357         struct nft_ctx ctx;
4358         size_t alloc_size;
4359         u64 timeout;
4360         char *name;
4361         int err, i;
4362         u16 udlen;
4363         u64 size;
4364
4365         if (nla[NFTA_SET_TABLE] == NULL ||
4366             nla[NFTA_SET_NAME] == NULL ||
4367             nla[NFTA_SET_KEY_LEN] == NULL ||
4368             nla[NFTA_SET_ID] == NULL)
4369                 return -EINVAL;
4370
4371         memset(&desc, 0, sizeof(desc));
4372
4373         ktype = NFT_DATA_VALUE;
4374         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4375                 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4376                 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4377                         return -EINVAL;
4378         }
4379
4380         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4381         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4382                 return -EINVAL;
4383
4384         flags = 0;
4385         if (nla[NFTA_SET_FLAGS] != NULL) {
4386                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4387                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4388                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4389                               NFT_SET_MAP | NFT_SET_EVAL |
4390                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4391                         return -EOPNOTSUPP;
4392                 /* Only one of these operations is supported */
4393                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4394                              (NFT_SET_MAP | NFT_SET_OBJECT))
4395                         return -EOPNOTSUPP;
4396                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4397                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4398                         return -EOPNOTSUPP;
4399         }
4400
4401         dtype = 0;
4402         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4403                 if (!(flags & NFT_SET_MAP))
4404                         return -EINVAL;
4405
4406                 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4407                 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4408                     dtype != NFT_DATA_VERDICT)
4409                         return -EINVAL;
4410
4411                 if (dtype != NFT_DATA_VERDICT) {
4412                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4413                                 return -EINVAL;
4414                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4415                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4416                                 return -EINVAL;
4417                 } else
4418                         desc.dlen = sizeof(struct nft_verdict);
4419         } else if (flags & NFT_SET_MAP)
4420                 return -EINVAL;
4421
4422         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4423                 if (!(flags & NFT_SET_OBJECT))
4424                         return -EINVAL;
4425
4426                 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4427                 if (objtype == NFT_OBJECT_UNSPEC ||
4428                     objtype > NFT_OBJECT_MAX)
4429                         return -EOPNOTSUPP;
4430         } else if (flags & NFT_SET_OBJECT)
4431                 return -EINVAL;
4432         else
4433                 objtype = NFT_OBJECT_UNSPEC;
4434
4435         timeout = 0;
4436         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4437                 if (!(flags & NFT_SET_TIMEOUT))
4438                         return -EINVAL;
4439
4440                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4441                 if (err)
4442                         return err;
4443         }
4444         gc_int = 0;
4445         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4446                 if (!(flags & NFT_SET_TIMEOUT))
4447                         return -EINVAL;
4448                 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4449         }
4450
4451         policy = NFT_SET_POL_PERFORMANCE;
4452         if (nla[NFTA_SET_POLICY] != NULL)
4453                 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4454
4455         if (nla[NFTA_SET_DESC] != NULL) {
4456                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4457                 if (err < 0)
4458                         return err;
4459
4460                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4461                         return -EINVAL;
4462         } else if (flags & NFT_SET_CONCAT) {
4463                 return -EINVAL;
4464         }
4465
4466         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4467                 desc.expr = true;
4468
4469         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4470                                  NETLINK_CB(skb).portid);
4471         if (IS_ERR(table)) {
4472                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4473                 return PTR_ERR(table);
4474         }
4475
4476         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4477
4478         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4479         if (IS_ERR(set)) {
4480                 if (PTR_ERR(set) != -ENOENT) {
4481                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4482                         return PTR_ERR(set);
4483                 }
4484         } else {
4485                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4486                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4487                         return -EEXIST;
4488                 }
4489                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4490                         return -EOPNOTSUPP;
4491
4492                 return 0;
4493         }
4494
4495         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4496                 return -ENOENT;
4497
4498         ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4499         if (IS_ERR(ops))
4500                 return PTR_ERR(ops);
4501
4502         udlen = 0;
4503         if (nla[NFTA_SET_USERDATA])
4504                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4505
4506         size = 0;
4507         if (ops->privsize != NULL)
4508                 size = ops->privsize(nla, &desc);
4509         alloc_size = sizeof(*set) + size + udlen;
4510         if (alloc_size < size || alloc_size > INT_MAX)
4511                 return -ENOMEM;
4512         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4513         if (!set)
4514                 return -ENOMEM;
4515
4516         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4517         if (!name) {
4518                 err = -ENOMEM;
4519                 goto err_set_name;
4520         }
4521
4522         err = nf_tables_set_alloc_name(&ctx, set, name);
4523         kfree(name);
4524         if (err < 0)
4525                 goto err_set_name;
4526
4527         udata = NULL;
4528         if (udlen) {
4529                 udata = set->data + size;
4530                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4531         }
4532
4533         INIT_LIST_HEAD(&set->bindings);
4534         INIT_LIST_HEAD(&set->catchall_list);
4535         set->table = table;
4536         write_pnet(&set->net, net);
4537         set->ops = ops;
4538         set->ktype = ktype;
4539         set->klen = desc.klen;
4540         set->dtype = dtype;
4541         set->objtype = objtype;
4542         set->dlen = desc.dlen;
4543         set->flags = flags;
4544         set->size = desc.size;
4545         set->policy = policy;
4546         set->udlen = udlen;
4547         set->udata = udata;
4548         set->timeout = timeout;
4549         set->gc_int = gc_int;
4550
4551         set->field_count = desc.field_count;
4552         for (i = 0; i < desc.field_count; i++)
4553                 set->field_len[i] = desc.field_len[i];
4554
4555         err = ops->init(set, &desc, nla);
4556         if (err < 0)
4557                 goto err_set_init;
4558
4559         if (nla[NFTA_SET_EXPR]) {
4560                 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4561                 if (IS_ERR(expr)) {
4562                         err = PTR_ERR(expr);
4563                         goto err_set_expr_alloc;
4564                 }
4565                 set->exprs[0] = expr;
4566                 set->num_exprs++;
4567         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4568                 struct nft_expr *expr;
4569                 struct nlattr *tmp;
4570                 int left;
4571
4572                 if (!(flags & NFT_SET_EXPR)) {
4573                         err = -EINVAL;
4574                         goto err_set_expr_alloc;
4575                 }
4576                 i = 0;
4577                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4578                         if (i == NFT_SET_EXPR_MAX) {
4579                                 err = -E2BIG;
4580                                 goto err_set_expr_alloc;
4581                         }
4582                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4583                                 err = -EINVAL;
4584                                 goto err_set_expr_alloc;
4585                         }
4586                         expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4587                         if (IS_ERR(expr)) {
4588                                 err = PTR_ERR(expr);
4589                                 goto err_set_expr_alloc;
4590                         }
4591                         set->exprs[i++] = expr;
4592                         set->num_exprs++;
4593                 }
4594         }
4595
4596         set->handle = nf_tables_alloc_handle(table);
4597
4598         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4599         if (err < 0)
4600                 goto err_set_expr_alloc;
4601
4602         list_add_tail_rcu(&set->list, &table->sets);
4603         table->use++;
4604         return 0;
4605
4606 err_set_expr_alloc:
4607         for (i = 0; i < set->num_exprs; i++)
4608                 nft_expr_destroy(&ctx, set->exprs[i]);
4609
4610         ops->destroy(set);
4611 err_set_init:
4612         kfree(set->name);
4613 err_set_name:
4614         kvfree(set);
4615         return err;
4616 }
4617
4618 struct nft_set_elem_catchall {
4619         struct list_head        list;
4620         struct rcu_head         rcu;
4621         void                    *elem;
4622 };
4623
4624 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4625                                      struct nft_set *set)
4626 {
4627         struct nft_set_elem_catchall *next, *catchall;
4628
4629         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4630                 list_del_rcu(&catchall->list);
4631                 nft_set_elem_destroy(set, catchall->elem, true);
4632                 kfree_rcu(catchall, rcu);
4633         }
4634 }
4635
4636 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4637 {
4638         int i;
4639
4640         if (WARN_ON(set->use > 0))
4641                 return;
4642
4643         for (i = 0; i < set->num_exprs; i++)
4644                 nft_expr_destroy(ctx, set->exprs[i]);
4645
4646         set->ops->destroy(set);
4647         nft_set_catchall_destroy(ctx, set);
4648         kfree(set->name);
4649         kvfree(set);
4650 }
4651
4652 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4653                             const struct nlattr * const nla[])
4654 {
4655         struct netlink_ext_ack *extack = info->extack;
4656         u8 genmask = nft_genmask_next(info->net);
4657         u8 family = info->nfmsg->nfgen_family;
4658         struct net *net = info->net;
4659         const struct nlattr *attr;
4660         struct nft_table *table;
4661         struct nft_set *set;
4662         struct nft_ctx ctx;
4663
4664         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4665                 return -EAFNOSUPPORT;
4666
4667         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4668                                  genmask, NETLINK_CB(skb).portid);
4669         if (IS_ERR(table)) {
4670                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4671                 return PTR_ERR(table);
4672         }
4673
4674         if (nla[NFTA_SET_HANDLE]) {
4675                 attr = nla[NFTA_SET_HANDLE];
4676                 set = nft_set_lookup_byhandle(table, attr, genmask);
4677         } else {
4678                 attr = nla[NFTA_SET_NAME];
4679                 set = nft_set_lookup(table, attr, genmask);
4680         }
4681
4682         if (IS_ERR(set)) {
4683                 NL_SET_BAD_ATTR(extack, attr);
4684                 return PTR_ERR(set);
4685         }
4686         if (set->use ||
4687             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4688              atomic_read(&set->nelems) > 0)) {
4689                 NL_SET_BAD_ATTR(extack, attr);
4690                 return -EBUSY;
4691         }
4692
4693         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4694
4695         return nft_delset(&ctx, set);
4696 }
4697
4698 static int nft_validate_register_store(const struct nft_ctx *ctx,
4699                                        enum nft_registers reg,
4700                                        const struct nft_data *data,
4701                                        enum nft_data_types type,
4702                                        unsigned int len);
4703
4704 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4705                                      struct nft_set *set,
4706                                      struct nft_set_elem *elem)
4707 {
4708         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4709         enum nft_registers dreg;
4710
4711         dreg = nft_type_to_reg(set->dtype);
4712         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4713                                            set->dtype == NFT_DATA_VERDICT ?
4714                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4715                                            set->dlen);
4716 }
4717
4718 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4719                                         struct nft_set *set,
4720                                         const struct nft_set_iter *iter,
4721                                         struct nft_set_elem *elem)
4722 {
4723         return nft_setelem_data_validate(ctx, set, elem);
4724 }
4725
4726 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4727                                        struct nft_set *set)
4728 {
4729         u8 genmask = nft_genmask_next(ctx->net);
4730         struct nft_set_elem_catchall *catchall;
4731         struct nft_set_elem elem;
4732         struct nft_set_ext *ext;
4733         int ret = 0;
4734
4735         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4736                 ext = nft_set_elem_ext(set, catchall->elem);
4737                 if (!nft_set_elem_active(ext, genmask))
4738                         continue;
4739
4740                 elem.priv = catchall->elem;
4741                 ret = nft_setelem_data_validate(ctx, set, &elem);
4742                 if (ret < 0)
4743                         break;
4744         }
4745
4746         return ret;
4747 }
4748
4749 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4750                        struct nft_set_binding *binding)
4751 {
4752         struct nft_set_binding *i;
4753         struct nft_set_iter iter;
4754
4755         if (set->use == UINT_MAX)
4756                 return -EOVERFLOW;
4757
4758         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4759                 return -EBUSY;
4760
4761         if (binding->flags & NFT_SET_MAP) {
4762                 /* If the set is already bound to the same chain all
4763                  * jumps are already validated for that chain.
4764                  */
4765                 list_for_each_entry(i, &set->bindings, list) {
4766                         if (i->flags & NFT_SET_MAP &&
4767                             i->chain == binding->chain)
4768                                 goto bind;
4769                 }
4770
4771                 iter.genmask    = nft_genmask_next(ctx->net);
4772                 iter.skip       = 0;
4773                 iter.count      = 0;
4774                 iter.err        = 0;
4775                 iter.fn         = nf_tables_bind_check_setelem;
4776
4777                 set->ops->walk(ctx, set, &iter);
4778                 if (!iter.err)
4779                         iter.err = nft_set_catchall_bind_check(ctx, set);
4780
4781                 if (iter.err < 0)
4782                         return iter.err;
4783         }
4784 bind:
4785         binding->chain = ctx->chain;
4786         list_add_tail_rcu(&binding->list, &set->bindings);
4787         nft_set_trans_bind(ctx, set);
4788         set->use++;
4789
4790         return 0;
4791 }
4792 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4793
4794 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4795                                  struct nft_set_binding *binding, bool event)
4796 {
4797         list_del_rcu(&binding->list);
4798
4799         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4800                 list_del_rcu(&set->list);
4801                 if (event)
4802                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4803                                              GFP_KERNEL);
4804         }
4805 }
4806
4807 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4808                               struct nft_set_binding *binding,
4809                               enum nft_trans_phase phase)
4810 {
4811         switch (phase) {
4812         case NFT_TRANS_PREPARE:
4813                 set->use--;
4814                 return;
4815         case NFT_TRANS_ABORT:
4816         case NFT_TRANS_RELEASE:
4817                 set->use--;
4818                 fallthrough;
4819         default:
4820                 nf_tables_unbind_set(ctx, set, binding,
4821                                      phase == NFT_TRANS_COMMIT);
4822         }
4823 }
4824 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4825
4826 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4827 {
4828         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4829                 nft_set_destroy(ctx, set);
4830 }
4831 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4832
4833 const struct nft_set_ext_type nft_set_ext_types[] = {
4834         [NFT_SET_EXT_KEY]               = {
4835                 .align  = __alignof__(u32),
4836         },
4837         [NFT_SET_EXT_DATA]              = {
4838                 .align  = __alignof__(u32),
4839         },
4840         [NFT_SET_EXT_EXPRESSIONS]       = {
4841                 .align  = __alignof__(struct nft_set_elem_expr),
4842         },
4843         [NFT_SET_EXT_OBJREF]            = {
4844                 .len    = sizeof(struct nft_object *),
4845                 .align  = __alignof__(struct nft_object *),
4846         },
4847         [NFT_SET_EXT_FLAGS]             = {
4848                 .len    = sizeof(u8),
4849                 .align  = __alignof__(u8),
4850         },
4851         [NFT_SET_EXT_TIMEOUT]           = {
4852                 .len    = sizeof(u64),
4853                 .align  = __alignof__(u64),
4854         },
4855         [NFT_SET_EXT_EXPIRATION]        = {
4856                 .len    = sizeof(u64),
4857                 .align  = __alignof__(u64),
4858         },
4859         [NFT_SET_EXT_USERDATA]          = {
4860                 .len    = sizeof(struct nft_userdata),
4861                 .align  = __alignof__(struct nft_userdata),
4862         },
4863         [NFT_SET_EXT_KEY_END]           = {
4864                 .align  = __alignof__(u32),
4865         },
4866 };
4867
4868 /*
4869  * Set elements
4870  */
4871
4872 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4873         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
4874         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
4875         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
4876         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
4877         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
4878         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
4879                                             .len = NFT_USERDATA_MAXLEN },
4880         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
4881         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
4882                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
4883         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
4884         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
4885 };
4886
4887 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4888         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
4889                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4890         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
4891                                             .len = NFT_SET_MAXNAMELEN - 1 },
4892         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
4893         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
4894 };
4895
4896 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4897                                   const struct nft_set *set,
4898                                   const struct nft_set_ext *ext)
4899 {
4900         struct nft_set_elem_expr *elem_expr;
4901         u32 size, num_exprs = 0;
4902         struct nft_expr *expr;
4903         struct nlattr *nest;
4904
4905         elem_expr = nft_set_ext_expr(ext);
4906         nft_setelem_expr_foreach(expr, elem_expr, size)
4907                 num_exprs++;
4908
4909         if (num_exprs == 1) {
4910                 expr = nft_setelem_expr_at(elem_expr, 0);
4911                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4912                         return -1;
4913
4914                 return 0;
4915         } else if (num_exprs > 1) {
4916                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4917                 if (nest == NULL)
4918                         goto nla_put_failure;
4919
4920                 nft_setelem_expr_foreach(expr, elem_expr, size) {
4921                         expr = nft_setelem_expr_at(elem_expr, size);
4922                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4923                                 goto nla_put_failure;
4924                 }
4925                 nla_nest_end(skb, nest);
4926         }
4927         return 0;
4928
4929 nla_put_failure:
4930         return -1;
4931 }
4932
4933 static int nf_tables_fill_setelem(struct sk_buff *skb,
4934                                   const struct nft_set *set,
4935                                   const struct nft_set_elem *elem)
4936 {
4937         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4938         unsigned char *b = skb_tail_pointer(skb);
4939         struct nlattr *nest;
4940
4941         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4942         if (nest == NULL)
4943                 goto nla_put_failure;
4944
4945         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4946             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4947                           NFT_DATA_VALUE, set->klen) < 0)
4948                 goto nla_put_failure;
4949
4950         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4951             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4952                           NFT_DATA_VALUE, set->klen) < 0)
4953                 goto nla_put_failure;
4954
4955         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4956             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4957                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4958                           set->dlen) < 0)
4959                 goto nla_put_failure;
4960
4961         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4962             nft_set_elem_expr_dump(skb, set, ext))
4963                 goto nla_put_failure;
4964
4965         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4966             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4967                            (*nft_set_ext_obj(ext))->key.name) < 0)
4968                 goto nla_put_failure;
4969
4970         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4971             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4972                          htonl(*nft_set_ext_flags(ext))))
4973                 goto nla_put_failure;
4974
4975         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4976             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4977                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4978                          NFTA_SET_ELEM_PAD))
4979                 goto nla_put_failure;
4980
4981         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4982                 u64 expires, now = get_jiffies_64();
4983
4984                 expires = *nft_set_ext_expiration(ext);
4985                 if (time_before64(now, expires))
4986                         expires -= now;
4987                 else
4988                         expires = 0;
4989
4990                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4991                                  nf_jiffies64_to_msecs(expires),
4992                                  NFTA_SET_ELEM_PAD))
4993                         goto nla_put_failure;
4994         }
4995
4996         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4997                 struct nft_userdata *udata;
4998
4999                 udata = nft_set_ext_userdata(ext);
5000                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5001                             udata->len + 1, udata->data))
5002                         goto nla_put_failure;
5003         }
5004
5005         nla_nest_end(skb, nest);
5006         return 0;
5007
5008 nla_put_failure:
5009         nlmsg_trim(skb, b);
5010         return -EMSGSIZE;
5011 }
5012
5013 struct nft_set_dump_args {
5014         const struct netlink_callback   *cb;
5015         struct nft_set_iter             iter;
5016         struct sk_buff                  *skb;
5017 };
5018
5019 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5020                                   struct nft_set *set,
5021                                   const struct nft_set_iter *iter,
5022                                   struct nft_set_elem *elem)
5023 {
5024         struct nft_set_dump_args *args;
5025
5026         args = container_of(iter, struct nft_set_dump_args, iter);
5027         return nf_tables_fill_setelem(args->skb, set, elem);
5028 }
5029
5030 struct nft_set_dump_ctx {
5031         const struct nft_set    *set;
5032         struct nft_ctx          ctx;
5033 };
5034
5035 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5036                                  const struct nft_set *set)
5037 {
5038         struct nft_set_elem_catchall *catchall;
5039         u8 genmask = nft_genmask_cur(net);
5040         struct nft_set_elem elem;
5041         struct nft_set_ext *ext;
5042         int ret = 0;
5043
5044         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5045                 ext = nft_set_elem_ext(set, catchall->elem);
5046                 if (!nft_set_elem_active(ext, genmask) ||
5047                     nft_set_elem_expired(ext))
5048                         continue;
5049
5050                 elem.priv = catchall->elem;
5051                 ret = nf_tables_fill_setelem(skb, set, &elem);
5052                 break;
5053         }
5054
5055         return ret;
5056 }
5057
5058 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5059 {
5060         struct nft_set_dump_ctx *dump_ctx = cb->data;
5061         struct net *net = sock_net(skb->sk);
5062         struct nftables_pernet *nft_net;
5063         struct nft_table *table;
5064         struct nft_set *set;
5065         struct nft_set_dump_args args;
5066         bool set_found = false;
5067         struct nlmsghdr *nlh;
5068         struct nlattr *nest;
5069         u32 portid, seq;
5070         int event;
5071
5072         rcu_read_lock();
5073         nft_net = nft_pernet(net);
5074         cb->seq = READ_ONCE(nft_net->base_seq);
5075
5076         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5077                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5078                     dump_ctx->ctx.family != table->family)
5079                         continue;
5080
5081                 if (table != dump_ctx->ctx.table)
5082                         continue;
5083
5084                 list_for_each_entry_rcu(set, &table->sets, list) {
5085                         if (set == dump_ctx->set) {
5086                                 set_found = true;
5087                                 break;
5088                         }
5089                 }
5090                 break;
5091         }
5092
5093         if (!set_found) {
5094                 rcu_read_unlock();
5095                 return -ENOENT;
5096         }
5097
5098         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5099         portid = NETLINK_CB(cb->skb).portid;
5100         seq    = cb->nlh->nlmsg_seq;
5101
5102         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5103                            table->family, NFNETLINK_V0, nft_base_seq(net));
5104         if (!nlh)
5105                 goto nla_put_failure;
5106
5107         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5108                 goto nla_put_failure;
5109         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5110                 goto nla_put_failure;
5111
5112         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5113         if (nest == NULL)
5114                 goto nla_put_failure;
5115
5116         args.cb                 = cb;
5117         args.skb                = skb;
5118         args.iter.genmask       = nft_genmask_cur(net);
5119         args.iter.skip          = cb->args[0];
5120         args.iter.count         = 0;
5121         args.iter.err           = 0;
5122         args.iter.fn            = nf_tables_dump_setelem;
5123         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5124
5125         if (!args.iter.err && args.iter.count == cb->args[0])
5126                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5127         rcu_read_unlock();
5128
5129         nla_nest_end(skb, nest);
5130         nlmsg_end(skb, nlh);
5131
5132         if (args.iter.err && args.iter.err != -EMSGSIZE)
5133                 return args.iter.err;
5134         if (args.iter.count == cb->args[0])
5135                 return 0;
5136
5137         cb->args[0] = args.iter.count;
5138         return skb->len;
5139
5140 nla_put_failure:
5141         rcu_read_unlock();
5142         return -ENOSPC;
5143 }
5144
5145 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5146 {
5147         struct nft_set_dump_ctx *dump_ctx = cb->data;
5148
5149         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5150
5151         return cb->data ? 0 : -ENOMEM;
5152 }
5153
5154 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5155 {
5156         kfree(cb->data);
5157         return 0;
5158 }
5159
5160 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5161                                        const struct nft_ctx *ctx, u32 seq,
5162                                        u32 portid, int event, u16 flags,
5163                                        const struct nft_set *set,
5164                                        const struct nft_set_elem *elem)
5165 {
5166         struct nlmsghdr *nlh;
5167         struct nlattr *nest;
5168         int err;
5169
5170         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5171         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5172                            NFNETLINK_V0, nft_base_seq(ctx->net));
5173         if (!nlh)
5174                 goto nla_put_failure;
5175
5176         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5177                 goto nla_put_failure;
5178         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5179                 goto nla_put_failure;
5180
5181         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5182         if (nest == NULL)
5183                 goto nla_put_failure;
5184
5185         err = nf_tables_fill_setelem(skb, set, elem);
5186         if (err < 0)
5187                 goto nla_put_failure;
5188
5189         nla_nest_end(skb, nest);
5190
5191         nlmsg_end(skb, nlh);
5192         return 0;
5193
5194 nla_put_failure:
5195         nlmsg_trim(skb, nlh);
5196         return -1;
5197 }
5198
5199 static int nft_setelem_parse_flags(const struct nft_set *set,
5200                                    const struct nlattr *attr, u32 *flags)
5201 {
5202         if (attr == NULL)
5203                 return 0;
5204
5205         *flags = ntohl(nla_get_be32(attr));
5206         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5207                 return -EOPNOTSUPP;
5208         if (!(set->flags & NFT_SET_INTERVAL) &&
5209             *flags & NFT_SET_ELEM_INTERVAL_END)
5210                 return -EINVAL;
5211         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5212             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5213                 return -EINVAL;
5214
5215         return 0;
5216 }
5217
5218 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5219                                  struct nft_data *key, struct nlattr *attr)
5220 {
5221         struct nft_data_desc desc = {
5222                 .type   = NFT_DATA_VALUE,
5223                 .size   = NFT_DATA_VALUE_MAXLEN,
5224                 .len    = set->klen,
5225         };
5226
5227         return nft_data_init(ctx, key, &desc, attr);
5228 }
5229
5230 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5231                                   struct nft_data_desc *desc,
5232                                   struct nft_data *data,
5233                                   struct nlattr *attr)
5234 {
5235         u32 dtype;
5236
5237         if (set->dtype == NFT_DATA_VERDICT)
5238                 dtype = NFT_DATA_VERDICT;
5239         else
5240                 dtype = NFT_DATA_VALUE;
5241
5242         desc->type = dtype;
5243         desc->size = NFT_DATA_VALUE_MAXLEN;
5244         desc->len = set->dlen;
5245         desc->flags = NFT_DATA_DESC_SETELEM;
5246
5247         return nft_data_init(ctx, data, desc, attr);
5248 }
5249
5250 static void *nft_setelem_catchall_get(const struct net *net,
5251                                       const struct nft_set *set)
5252 {
5253         struct nft_set_elem_catchall *catchall;
5254         u8 genmask = nft_genmask_cur(net);
5255         struct nft_set_ext *ext;
5256         void *priv = NULL;
5257
5258         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5259                 ext = nft_set_elem_ext(set, catchall->elem);
5260                 if (!nft_set_elem_active(ext, genmask) ||
5261                     nft_set_elem_expired(ext))
5262                         continue;
5263
5264                 priv = catchall->elem;
5265                 break;
5266         }
5267
5268         return priv;
5269 }
5270
5271 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5272                            struct nft_set_elem *elem, u32 flags)
5273 {
5274         void *priv;
5275
5276         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5277                 priv = set->ops->get(ctx->net, set, elem, flags);
5278                 if (IS_ERR(priv))
5279                         return PTR_ERR(priv);
5280         } else {
5281                 priv = nft_setelem_catchall_get(ctx->net, set);
5282                 if (!priv)
5283                         return -ENOENT;
5284         }
5285         elem->priv = priv;
5286
5287         return 0;
5288 }
5289
5290 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5291                             const struct nlattr *attr)
5292 {
5293         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5294         struct nft_set_elem elem;
5295         struct sk_buff *skb;
5296         uint32_t flags = 0;
5297         int err;
5298
5299         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5300                                           nft_set_elem_policy, NULL);
5301         if (err < 0)
5302                 return err;
5303
5304         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5305         if (err < 0)
5306                 return err;
5307
5308         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5309                 return -EINVAL;
5310
5311         if (nla[NFTA_SET_ELEM_KEY]) {
5312                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5313                                             nla[NFTA_SET_ELEM_KEY]);
5314                 if (err < 0)
5315                         return err;
5316         }
5317
5318         if (nla[NFTA_SET_ELEM_KEY_END]) {
5319                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5320                                             nla[NFTA_SET_ELEM_KEY_END]);
5321                 if (err < 0)
5322                         return err;
5323         }
5324
5325         err = nft_setelem_get(ctx, set, &elem, flags);
5326         if (err < 0)
5327                 return err;
5328
5329         err = -ENOMEM;
5330         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5331         if (skb == NULL)
5332                 return err;
5333
5334         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5335                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5336         if (err < 0)
5337                 goto err_fill_setelem;
5338
5339         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5340
5341 err_fill_setelem:
5342         kfree_skb(skb);
5343         return err;
5344 }
5345
5346 /* called with rcu_read_lock held */
5347 static int nf_tables_getsetelem(struct sk_buff *skb,
5348                                 const struct nfnl_info *info,
5349                                 const struct nlattr * const nla[])
5350 {
5351         struct netlink_ext_ack *extack = info->extack;
5352         u8 genmask = nft_genmask_cur(info->net);
5353         u8 family = info->nfmsg->nfgen_family;
5354         struct net *net = info->net;
5355         struct nft_table *table;
5356         struct nft_set *set;
5357         struct nlattr *attr;
5358         struct nft_ctx ctx;
5359         int rem, err = 0;
5360
5361         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5362                                  genmask, NETLINK_CB(skb).portid);
5363         if (IS_ERR(table)) {
5364                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5365                 return PTR_ERR(table);
5366         }
5367
5368         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5369         if (IS_ERR(set))
5370                 return PTR_ERR(set);
5371
5372         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5373
5374         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5375                 struct netlink_dump_control c = {
5376                         .start = nf_tables_dump_set_start,
5377                         .dump = nf_tables_dump_set,
5378                         .done = nf_tables_dump_set_done,
5379                         .module = THIS_MODULE,
5380                 };
5381                 struct nft_set_dump_ctx dump_ctx = {
5382                         .set = set,
5383                         .ctx = ctx,
5384                 };
5385
5386                 c.data = &dump_ctx;
5387                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5388         }
5389
5390         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5391                 return -EINVAL;
5392
5393         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5394                 err = nft_get_set_elem(&ctx, set, attr);
5395                 if (err < 0) {
5396                         NL_SET_BAD_ATTR(extack, attr);
5397                         break;
5398                 }
5399         }
5400
5401         return err;
5402 }
5403
5404 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5405                                      const struct nft_set *set,
5406                                      const struct nft_set_elem *elem,
5407                                      int event)
5408 {
5409         struct nftables_pernet *nft_net;
5410         struct net *net = ctx->net;
5411         u32 portid = ctx->portid;
5412         struct sk_buff *skb;
5413         u16 flags = 0;
5414         int err;
5415
5416         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5417                 return;
5418
5419         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5420         if (skb == NULL)
5421                 goto err;
5422
5423         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5424                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5425
5426         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5427                                           set, elem);
5428         if (err < 0) {
5429                 kfree_skb(skb);
5430                 goto err;
5431         }
5432
5433         nft_net = nft_pernet(net);
5434         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5435         return;
5436 err:
5437         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5438 }
5439
5440 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5441                                               int msg_type,
5442                                               struct nft_set *set)
5443 {
5444         struct nft_trans *trans;
5445
5446         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5447         if (trans == NULL)
5448                 return NULL;
5449
5450         nft_trans_elem_set(trans) = set;
5451         return trans;
5452 }
5453
5454 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5455                                          const struct nft_set *set,
5456                                          const struct nlattr *attr)
5457 {
5458         struct nft_expr *expr;
5459         int err;
5460
5461         expr = nft_expr_init(ctx, attr);
5462         if (IS_ERR(expr))
5463                 return expr;
5464
5465         err = -EOPNOTSUPP;
5466         if (expr->ops->type->flags & NFT_EXPR_GC) {
5467                 if (set->flags & NFT_SET_TIMEOUT)
5468                         goto err_set_elem_expr;
5469                 if (!set->ops->gc_init)
5470                         goto err_set_elem_expr;
5471                 set->ops->gc_init(set);
5472         }
5473
5474         return expr;
5475
5476 err_set_elem_expr:
5477         nft_expr_destroy(ctx, expr);
5478         return ERR_PTR(err);
5479 }
5480
5481 void *nft_set_elem_init(const struct nft_set *set,
5482                         const struct nft_set_ext_tmpl *tmpl,
5483                         const u32 *key, const u32 *key_end,
5484                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5485 {
5486         struct nft_set_ext *ext;
5487         void *elem;
5488
5489         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5490         if (elem == NULL)
5491                 return NULL;
5492
5493         ext = nft_set_elem_ext(set, elem);
5494         nft_set_ext_init(ext, tmpl);
5495
5496         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5497                 memcpy(nft_set_ext_key(ext), key, set->klen);
5498         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5499                 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5500         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5501                 memcpy(nft_set_ext_data(ext), data, set->dlen);
5502         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5503                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5504                 if (expiration == 0)
5505                         *nft_set_ext_expiration(ext) += timeout;
5506         }
5507         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5508                 *nft_set_ext_timeout(ext) = timeout;
5509
5510         return elem;
5511 }
5512
5513 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5514                                         struct nft_expr *expr)
5515 {
5516         if (expr->ops->destroy_clone) {
5517                 expr->ops->destroy_clone(ctx, expr);
5518                 module_put(expr->ops->type->owner);
5519         } else {
5520                 nf_tables_expr_destroy(ctx, expr);
5521         }
5522 }
5523
5524 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5525                                       struct nft_set_elem_expr *elem_expr)
5526 {
5527         struct nft_expr *expr;
5528         u32 size;
5529
5530         nft_setelem_expr_foreach(expr, elem_expr, size)
5531                 __nft_set_elem_expr_destroy(ctx, expr);
5532 }
5533
5534 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5535                           bool destroy_expr)
5536 {
5537         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5538         struct nft_ctx ctx = {
5539                 .net    = read_pnet(&set->net),
5540                 .family = set->table->family,
5541         };
5542
5543         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5544         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5545                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5546         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5547                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5548
5549         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5550                 (*nft_set_ext_obj(ext))->use--;
5551         kfree(elem);
5552 }
5553 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5554
5555 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5556  * with the refcounting from the preparation phase.
5557  */
5558 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5559                                        const struct nft_set *set, void *elem)
5560 {
5561         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5562
5563         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5564                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5565
5566         kfree(elem);
5567 }
5568
5569 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5570                             struct nft_expr *expr_array[])
5571 {
5572         struct nft_expr *expr;
5573         int err, i, k;
5574
5575         for (i = 0; i < set->num_exprs; i++) {
5576                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5577                 if (!expr)
5578                         goto err_expr;
5579
5580                 err = nft_expr_clone(expr, set->exprs[i]);
5581                 if (err < 0) {
5582                         kfree(expr);
5583                         goto err_expr;
5584                 }
5585                 expr_array[i] = expr;
5586         }
5587
5588         return 0;
5589
5590 err_expr:
5591         for (k = i - 1; k >= 0; k--)
5592                 nft_expr_destroy(ctx, expr_array[k]);
5593
5594         return -ENOMEM;
5595 }
5596
5597 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5598                                    const struct nft_set_ext *ext,
5599                                    struct nft_expr *expr_array[],
5600                                    u32 num_exprs)
5601 {
5602         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5603         struct nft_expr *expr;
5604         int i, err;
5605
5606         for (i = 0; i < num_exprs; i++) {
5607                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5608                 err = nft_expr_clone(expr, expr_array[i]);
5609                 if (err < 0)
5610                         goto err_elem_expr_setup;
5611
5612                 elem_expr->size += expr_array[i]->ops->size;
5613                 nft_expr_destroy(ctx, expr_array[i]);
5614                 expr_array[i] = NULL;
5615         }
5616
5617         return 0;
5618
5619 err_elem_expr_setup:
5620         for (; i < num_exprs; i++) {
5621                 nft_expr_destroy(ctx, expr_array[i]);
5622                 expr_array[i] = NULL;
5623         }
5624
5625         return -ENOMEM;
5626 }
5627
5628 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5629                                             const struct nft_set *set)
5630 {
5631         struct nft_set_elem_catchall *catchall;
5632         u8 genmask = nft_genmask_cur(net);
5633         struct nft_set_ext *ext;
5634
5635         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5636                 ext = nft_set_elem_ext(set, catchall->elem);
5637                 if (nft_set_elem_active(ext, genmask) &&
5638                     !nft_set_elem_expired(ext))
5639                         return ext;
5640         }
5641
5642         return NULL;
5643 }
5644 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5645
5646 void *nft_set_catchall_gc(const struct nft_set *set)
5647 {
5648         struct nft_set_elem_catchall *catchall, *next;
5649         struct nft_set_ext *ext;
5650         void *elem = NULL;
5651
5652         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5653                 ext = nft_set_elem_ext(set, catchall->elem);
5654
5655                 if (!nft_set_elem_expired(ext) ||
5656                     nft_set_elem_mark_busy(ext))
5657                         continue;
5658
5659                 elem = catchall->elem;
5660                 list_del_rcu(&catchall->list);
5661                 kfree_rcu(catchall, rcu);
5662                 break;
5663         }
5664
5665         return elem;
5666 }
5667 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5668
5669 static int nft_setelem_catchall_insert(const struct net *net,
5670                                        struct nft_set *set,
5671                                        const struct nft_set_elem *elem,
5672                                        struct nft_set_ext **pext)
5673 {
5674         struct nft_set_elem_catchall *catchall;
5675         u8 genmask = nft_genmask_next(net);
5676         struct nft_set_ext *ext;
5677
5678         list_for_each_entry(catchall, &set->catchall_list, list) {
5679                 ext = nft_set_elem_ext(set, catchall->elem);
5680                 if (nft_set_elem_active(ext, genmask)) {
5681                         *pext = ext;
5682                         return -EEXIST;
5683                 }
5684         }
5685
5686         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5687         if (!catchall)
5688                 return -ENOMEM;
5689
5690         catchall->elem = elem->priv;
5691         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5692
5693         return 0;
5694 }
5695
5696 static int nft_setelem_insert(const struct net *net,
5697                               struct nft_set *set,
5698                               const struct nft_set_elem *elem,
5699                               struct nft_set_ext **ext, unsigned int flags)
5700 {
5701         int ret;
5702
5703         if (flags & NFT_SET_ELEM_CATCHALL)
5704                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5705         else
5706                 ret = set->ops->insert(net, set, elem, ext);
5707
5708         return ret;
5709 }
5710
5711 static bool nft_setelem_is_catchall(const struct nft_set *set,
5712                                     const struct nft_set_elem *elem)
5713 {
5714         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5715
5716         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5717             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5718                 return true;
5719
5720         return false;
5721 }
5722
5723 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5724                                  struct nft_set_elem *elem)
5725 {
5726         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5727
5728         if (nft_setelem_is_catchall(set, elem)) {
5729                 nft_set_elem_change_active(net, set, ext);
5730                 nft_set_elem_clear_busy(ext);
5731         } else {
5732                 set->ops->activate(net, set, elem);
5733         }
5734 }
5735
5736 static int nft_setelem_catchall_deactivate(const struct net *net,
5737                                            struct nft_set *set,
5738                                            struct nft_set_elem *elem)
5739 {
5740         struct nft_set_elem_catchall *catchall;
5741         struct nft_set_ext *ext;
5742
5743         list_for_each_entry(catchall, &set->catchall_list, list) {
5744                 ext = nft_set_elem_ext(set, catchall->elem);
5745                 if (!nft_is_active(net, ext) ||
5746                     nft_set_elem_mark_busy(ext))
5747                         continue;
5748
5749                 kfree(elem->priv);
5750                 elem->priv = catchall->elem;
5751                 nft_set_elem_change_active(net, set, ext);
5752                 return 0;
5753         }
5754
5755         return -ENOENT;
5756 }
5757
5758 static int __nft_setelem_deactivate(const struct net *net,
5759                                     struct nft_set *set,
5760                                     struct nft_set_elem *elem)
5761 {
5762         void *priv;
5763
5764         priv = set->ops->deactivate(net, set, elem);
5765         if (!priv)
5766                 return -ENOENT;
5767
5768         kfree(elem->priv);
5769         elem->priv = priv;
5770         set->ndeact++;
5771
5772         return 0;
5773 }
5774
5775 static int nft_setelem_deactivate(const struct net *net,
5776                                   struct nft_set *set,
5777                                   struct nft_set_elem *elem, u32 flags)
5778 {
5779         int ret;
5780
5781         if (flags & NFT_SET_ELEM_CATCHALL)
5782                 ret = nft_setelem_catchall_deactivate(net, set, elem);
5783         else
5784                 ret = __nft_setelem_deactivate(net, set, elem);
5785
5786         return ret;
5787 }
5788
5789 static void nft_setelem_catchall_remove(const struct net *net,
5790                                         const struct nft_set *set,
5791                                         const struct nft_set_elem *elem)
5792 {
5793         struct nft_set_elem_catchall *catchall, *next;
5794
5795         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5796                 if (catchall->elem == elem->priv) {
5797                         list_del_rcu(&catchall->list);
5798                         kfree_rcu(catchall, rcu);
5799                         break;
5800                 }
5801         }
5802 }
5803
5804 static void nft_setelem_remove(const struct net *net,
5805                                const struct nft_set *set,
5806                                const struct nft_set_elem *elem)
5807 {
5808         if (nft_setelem_is_catchall(set, elem))
5809                 nft_setelem_catchall_remove(net, set, elem);
5810         else
5811                 set->ops->remove(net, set, elem);
5812 }
5813
5814 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5815                                       struct nlattr **nla, u32 flags)
5816 {
5817         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5818                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5819                 if (flags & NFT_SET_ELEM_INTERVAL_END)
5820                         return false;
5821                 if (!nla[NFTA_SET_ELEM_KEY_END] &&
5822                     !(flags & NFT_SET_ELEM_CATCHALL))
5823                         return false;
5824         } else {
5825                 if (nla[NFTA_SET_ELEM_KEY_END])
5826                         return false;
5827         }
5828
5829         return true;
5830 }
5831
5832 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5833                             const struct nlattr *attr, u32 nlmsg_flags)
5834 {
5835         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5836         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5837         u8 genmask = nft_genmask_next(ctx->net);
5838         u32 flags = 0, size = 0, num_exprs = 0;
5839         struct nft_set_ext_tmpl tmpl;
5840         struct nft_set_ext *ext, *ext2;
5841         struct nft_set_elem elem;
5842         struct nft_set_binding *binding;
5843         struct nft_object *obj = NULL;
5844         struct nft_userdata *udata;
5845         struct nft_data_desc desc;
5846         enum nft_registers dreg;
5847         struct nft_trans *trans;
5848         u64 timeout;
5849         u64 expiration;
5850         int err, i;
5851         u8 ulen;
5852
5853         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5854                                           nft_set_elem_policy, NULL);
5855         if (err < 0)
5856                 return err;
5857
5858         nft_set_ext_prepare(&tmpl);
5859
5860         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5861         if (err < 0)
5862                 return err;
5863
5864         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5865                 return -EINVAL;
5866
5867         if (flags != 0) {
5868                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5869                 if (err < 0)
5870                         return err;
5871         }
5872
5873         if (set->flags & NFT_SET_MAP) {
5874                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5875                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5876                         return -EINVAL;
5877         } else {
5878                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5879                         return -EINVAL;
5880         }
5881
5882         if (set->flags & NFT_SET_OBJECT) {
5883                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
5884                     !(flags & NFT_SET_ELEM_INTERVAL_END))
5885                         return -EINVAL;
5886         } else {
5887                 if (nla[NFTA_SET_ELEM_OBJREF])
5888                         return -EINVAL;
5889         }
5890
5891         if (!nft_setelem_valid_key_end(set, nla, flags))
5892                 return -EINVAL;
5893
5894         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5895              (nla[NFTA_SET_ELEM_DATA] ||
5896               nla[NFTA_SET_ELEM_OBJREF] ||
5897               nla[NFTA_SET_ELEM_TIMEOUT] ||
5898               nla[NFTA_SET_ELEM_EXPIRATION] ||
5899               nla[NFTA_SET_ELEM_USERDATA] ||
5900               nla[NFTA_SET_ELEM_EXPR] ||
5901               nla[NFTA_SET_ELEM_KEY_END] ||
5902               nla[NFTA_SET_ELEM_EXPRESSIONS]))
5903                 return -EINVAL;
5904
5905         timeout = 0;
5906         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5907                 if (!(set->flags & NFT_SET_TIMEOUT))
5908                         return -EINVAL;
5909                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5910                                             &timeout);
5911                 if (err)
5912                         return err;
5913         } else if (set->flags & NFT_SET_TIMEOUT) {
5914                 timeout = set->timeout;
5915         }
5916
5917         expiration = 0;
5918         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5919                 if (!(set->flags & NFT_SET_TIMEOUT))
5920                         return -EINVAL;
5921                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5922                                             &expiration);
5923                 if (err)
5924                         return err;
5925         }
5926
5927         if (nla[NFTA_SET_ELEM_EXPR]) {
5928                 struct nft_expr *expr;
5929
5930                 if (set->num_exprs && set->num_exprs != 1)
5931                         return -EOPNOTSUPP;
5932
5933                 expr = nft_set_elem_expr_alloc(ctx, set,
5934                                                nla[NFTA_SET_ELEM_EXPR]);
5935                 if (IS_ERR(expr))
5936                         return PTR_ERR(expr);
5937
5938                 expr_array[0] = expr;
5939                 num_exprs = 1;
5940
5941                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5942                         err = -EOPNOTSUPP;
5943                         goto err_set_elem_expr;
5944                 }
5945         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5946                 struct nft_expr *expr;
5947                 struct nlattr *tmp;
5948                 int left;
5949
5950                 i = 0;
5951                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5952                         if (i == NFT_SET_EXPR_MAX ||
5953                             (set->num_exprs && set->num_exprs == i)) {
5954                                 err = -E2BIG;
5955                                 goto err_set_elem_expr;
5956                         }
5957                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
5958                                 err = -EINVAL;
5959                                 goto err_set_elem_expr;
5960                         }
5961                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5962                         if (IS_ERR(expr)) {
5963                                 err = PTR_ERR(expr);
5964                                 goto err_set_elem_expr;
5965                         }
5966                         expr_array[i] = expr;
5967                         num_exprs++;
5968
5969                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5970                                 err = -EOPNOTSUPP;
5971                                 goto err_set_elem_expr;
5972                         }
5973                         i++;
5974                 }
5975                 if (set->num_exprs && set->num_exprs != i) {
5976                         err = -EOPNOTSUPP;
5977                         goto err_set_elem_expr;
5978                 }
5979         } else if (set->num_exprs > 0) {
5980                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5981                 if (err < 0)
5982                         goto err_set_elem_expr_clone;
5983
5984                 num_exprs = set->num_exprs;
5985         }
5986
5987         if (nla[NFTA_SET_ELEM_KEY]) {
5988                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5989                                             nla[NFTA_SET_ELEM_KEY]);
5990                 if (err < 0)
5991                         goto err_set_elem_expr;
5992
5993                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5994                 if (err < 0)
5995                         goto err_parse_key;
5996         }
5997
5998         if (nla[NFTA_SET_ELEM_KEY_END]) {
5999                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6000                                             nla[NFTA_SET_ELEM_KEY_END]);
6001                 if (err < 0)
6002                         goto err_parse_key;
6003
6004                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6005                 if (err < 0)
6006                         goto err_parse_key_end;
6007         }
6008
6009         if (timeout > 0) {
6010                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6011                 if (err < 0)
6012                         goto err_parse_key_end;
6013
6014                 if (timeout != set->timeout) {
6015                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6016                         if (err < 0)
6017                                 goto err_parse_key_end;
6018                 }
6019         }
6020
6021         if (num_exprs) {
6022                 for (i = 0; i < num_exprs; i++)
6023                         size += expr_array[i]->ops->size;
6024
6025                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6026                                              sizeof(struct nft_set_elem_expr) + size);
6027                 if (err < 0)
6028                         goto err_parse_key_end;
6029         }
6030
6031         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6032                 obj = nft_obj_lookup(ctx->net, ctx->table,
6033                                      nla[NFTA_SET_ELEM_OBJREF],
6034                                      set->objtype, genmask);
6035                 if (IS_ERR(obj)) {
6036                         err = PTR_ERR(obj);
6037                         goto err_parse_key_end;
6038                 }
6039                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6040                 if (err < 0)
6041                         goto err_parse_key_end;
6042         }
6043
6044         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6045                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6046                                              nla[NFTA_SET_ELEM_DATA]);
6047                 if (err < 0)
6048                         goto err_parse_key_end;
6049
6050                 dreg = nft_type_to_reg(set->dtype);
6051                 list_for_each_entry(binding, &set->bindings, list) {
6052                         struct nft_ctx bind_ctx = {
6053                                 .net    = ctx->net,
6054                                 .family = ctx->family,
6055                                 .table  = ctx->table,
6056                                 .chain  = (struct nft_chain *)binding->chain,
6057                         };
6058
6059                         if (!(binding->flags & NFT_SET_MAP))
6060                                 continue;
6061
6062                         err = nft_validate_register_store(&bind_ctx, dreg,
6063                                                           &elem.data.val,
6064                                                           desc.type, desc.len);
6065                         if (err < 0)
6066                                 goto err_parse_data;
6067
6068                         if (desc.type == NFT_DATA_VERDICT &&
6069                             (elem.data.val.verdict.code == NFT_GOTO ||
6070                              elem.data.val.verdict.code == NFT_JUMP))
6071                                 nft_validate_state_update(ctx->net,
6072                                                           NFT_VALIDATE_NEED);
6073                 }
6074
6075                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6076                 if (err < 0)
6077                         goto err_parse_data;
6078         }
6079
6080         /* The full maximum length of userdata can exceed the maximum
6081          * offset value (U8_MAX) for following extensions, therefor it
6082          * must be the last extension added.
6083          */
6084         ulen = 0;
6085         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6086                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6087                 if (ulen > 0) {
6088                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6089                                                      ulen);
6090                         if (err < 0)
6091                                 goto err_parse_data;
6092                 }
6093         }
6094
6095         err = -ENOMEM;
6096         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6097                                       elem.key_end.val.data, elem.data.val.data,
6098                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6099         if (elem.priv == NULL)
6100                 goto err_parse_data;
6101
6102         ext = nft_set_elem_ext(set, elem.priv);
6103         if (flags)
6104                 *nft_set_ext_flags(ext) = flags;
6105         if (ulen > 0) {
6106                 udata = nft_set_ext_userdata(ext);
6107                 udata->len = ulen - 1;
6108                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6109         }
6110         if (obj) {
6111                 *nft_set_ext_obj(ext) = obj;
6112                 obj->use++;
6113         }
6114         err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
6115         if (err < 0)
6116                 goto err_elem_expr;
6117
6118         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6119         if (trans == NULL) {
6120                 err = -ENOMEM;
6121                 goto err_elem_expr;
6122         }
6123
6124         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6125
6126         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6127         if (err) {
6128                 if (err == -EEXIST) {
6129                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6130                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6131                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6132                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6133                                 goto err_element_clash;
6134                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6135                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6136                              memcmp(nft_set_ext_data(ext),
6137                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6138                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6139                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6140                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6141                                 goto err_element_clash;
6142                         else if (!(nlmsg_flags & NLM_F_EXCL))
6143                                 err = 0;
6144                 } else if (err == -ENOTEMPTY) {
6145                         /* ENOTEMPTY reports overlapping between this element
6146                          * and an existing one.
6147                          */
6148                         err = -EEXIST;
6149                 }
6150                 goto err_element_clash;
6151         }
6152
6153         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6154             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6155                 err = -ENFILE;
6156                 goto err_set_full;
6157         }
6158
6159         nft_trans_elem(trans) = elem;
6160         nft_trans_commit_list_add_tail(ctx->net, trans);
6161         return 0;
6162
6163 err_set_full:
6164         nft_setelem_remove(ctx->net, set, &elem);
6165 err_element_clash:
6166         kfree(trans);
6167 err_elem_expr:
6168         if (obj)
6169                 obj->use--;
6170
6171         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6172 err_parse_data:
6173         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6174                 nft_data_release(&elem.data.val, desc.type);
6175 err_parse_key_end:
6176         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6177 err_parse_key:
6178         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6179 err_set_elem_expr:
6180         for (i = 0; i < num_exprs && expr_array[i]; i++)
6181                 nft_expr_destroy(ctx, expr_array[i]);
6182 err_set_elem_expr_clone:
6183         return err;
6184 }
6185
6186 static int nf_tables_newsetelem(struct sk_buff *skb,
6187                                 const struct nfnl_info *info,
6188                                 const struct nlattr * const nla[])
6189 {
6190         struct nftables_pernet *nft_net = nft_pernet(info->net);
6191         struct netlink_ext_ack *extack = info->extack;
6192         u8 genmask = nft_genmask_next(info->net);
6193         u8 family = info->nfmsg->nfgen_family;
6194         struct net *net = info->net;
6195         const struct nlattr *attr;
6196         struct nft_table *table;
6197         struct nft_set *set;
6198         struct nft_ctx ctx;
6199         int rem, err;
6200
6201         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6202                 return -EINVAL;
6203
6204         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6205                                  genmask, NETLINK_CB(skb).portid);
6206         if (IS_ERR(table)) {
6207                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6208                 return PTR_ERR(table);
6209         }
6210
6211         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6212                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6213         if (IS_ERR(set))
6214                 return PTR_ERR(set);
6215
6216         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6217                 return -EBUSY;
6218
6219         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6220
6221         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6222                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6223                 if (err < 0) {
6224                         NL_SET_BAD_ATTR(extack, attr);
6225                         return err;
6226                 }
6227         }
6228
6229         if (nft_net->validate_state == NFT_VALIDATE_DO)
6230                 return nft_table_validate(net, table);
6231
6232         return 0;
6233 }
6234
6235 /**
6236  *      nft_data_hold - hold a nft_data item
6237  *
6238  *      @data: struct nft_data to release
6239  *      @type: type of data
6240  *
6241  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6242  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6243  *      NFT_GOTO verdicts. This function must be called on active data objects
6244  *      from the second phase of the commit protocol.
6245  */
6246 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6247 {
6248         struct nft_chain *chain;
6249         struct nft_rule *rule;
6250
6251         if (type == NFT_DATA_VERDICT) {
6252                 switch (data->verdict.code) {
6253                 case NFT_JUMP:
6254                 case NFT_GOTO:
6255                         chain = data->verdict.chain;
6256                         chain->use++;
6257
6258                         if (!nft_chain_is_bound(chain))
6259                                 break;
6260
6261                         chain->table->use++;
6262                         list_for_each_entry(rule, &chain->rules, list)
6263                                 chain->use++;
6264
6265                         nft_chain_add(chain->table, chain);
6266                         break;
6267                 }
6268         }
6269 }
6270
6271 static void nft_setelem_data_activate(const struct net *net,
6272                                       const struct nft_set *set,
6273                                       struct nft_set_elem *elem)
6274 {
6275         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6276
6277         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6278                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6279         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6280                 (*nft_set_ext_obj(ext))->use++;
6281 }
6282
6283 static void nft_setelem_data_deactivate(const struct net *net,
6284                                         const struct nft_set *set,
6285                                         struct nft_set_elem *elem)
6286 {
6287         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6288
6289         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6290                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6291         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6292                 (*nft_set_ext_obj(ext))->use--;
6293 }
6294
6295 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6296                            const struct nlattr *attr)
6297 {
6298         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6299         struct nft_set_ext_tmpl tmpl;
6300         struct nft_set_elem elem;
6301         struct nft_set_ext *ext;
6302         struct nft_trans *trans;
6303         u32 flags = 0;
6304         int err;
6305
6306         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6307                                           nft_set_elem_policy, NULL);
6308         if (err < 0)
6309                 return err;
6310
6311         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6312         if (err < 0)
6313                 return err;
6314
6315         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6316                 return -EINVAL;
6317
6318         if (!nft_setelem_valid_key_end(set, nla, flags))
6319                 return -EINVAL;
6320
6321         nft_set_ext_prepare(&tmpl);
6322
6323         if (flags != 0) {
6324                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6325                 if (err < 0)
6326                         return err;
6327         }
6328
6329         if (nla[NFTA_SET_ELEM_KEY]) {
6330                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6331                                             nla[NFTA_SET_ELEM_KEY]);
6332                 if (err < 0)
6333                         return err;
6334
6335                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6336                 if (err < 0)
6337                         goto fail_elem;
6338         }
6339
6340         if (nla[NFTA_SET_ELEM_KEY_END]) {
6341                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6342                                             nla[NFTA_SET_ELEM_KEY_END]);
6343                 if (err < 0)
6344                         goto fail_elem;
6345
6346                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6347                 if (err < 0)
6348                         goto fail_elem_key_end;
6349         }
6350
6351         err = -ENOMEM;
6352         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6353                                       elem.key_end.val.data, NULL, 0, 0,
6354                                       GFP_KERNEL_ACCOUNT);
6355         if (elem.priv == NULL)
6356                 goto fail_elem_key_end;
6357
6358         ext = nft_set_elem_ext(set, elem.priv);
6359         if (flags)
6360                 *nft_set_ext_flags(ext) = flags;
6361
6362         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6363         if (trans == NULL)
6364                 goto fail_trans;
6365
6366         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6367         if (err < 0)
6368                 goto fail_ops;
6369
6370         nft_setelem_data_deactivate(ctx->net, set, &elem);
6371
6372         nft_trans_elem(trans) = elem;
6373         nft_trans_commit_list_add_tail(ctx->net, trans);
6374         return 0;
6375
6376 fail_ops:
6377         kfree(trans);
6378 fail_trans:
6379         kfree(elem.priv);
6380 fail_elem_key_end:
6381         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6382 fail_elem:
6383         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6384         return err;
6385 }
6386
6387 static int nft_setelem_flush(const struct nft_ctx *ctx,
6388                              struct nft_set *set,
6389                              const struct nft_set_iter *iter,
6390                              struct nft_set_elem *elem)
6391 {
6392         struct nft_trans *trans;
6393         int err;
6394
6395         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6396                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6397         if (!trans)
6398                 return -ENOMEM;
6399
6400         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6401                 err = -ENOENT;
6402                 goto err1;
6403         }
6404         set->ndeact++;
6405
6406         nft_setelem_data_deactivate(ctx->net, set, elem);
6407         nft_trans_elem_set(trans) = set;
6408         nft_trans_elem(trans) = *elem;
6409         nft_trans_commit_list_add_tail(ctx->net, trans);
6410
6411         return 0;
6412 err1:
6413         kfree(trans);
6414         return err;
6415 }
6416
6417 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6418                                     struct nft_set *set,
6419                                     struct nft_set_elem *elem)
6420 {
6421         struct nft_trans *trans;
6422
6423         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6424                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6425         if (!trans)
6426                 return -ENOMEM;
6427
6428         nft_setelem_data_deactivate(ctx->net, set, elem);
6429         nft_trans_elem_set(trans) = set;
6430         nft_trans_elem(trans) = *elem;
6431         nft_trans_commit_list_add_tail(ctx->net, trans);
6432
6433         return 0;
6434 }
6435
6436 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6437                                   struct nft_set *set)
6438 {
6439         u8 genmask = nft_genmask_next(ctx->net);
6440         struct nft_set_elem_catchall *catchall;
6441         struct nft_set_elem elem;
6442         struct nft_set_ext *ext;
6443         int ret = 0;
6444
6445         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6446                 ext = nft_set_elem_ext(set, catchall->elem);
6447                 if (!nft_set_elem_active(ext, genmask) ||
6448                     nft_set_elem_mark_busy(ext))
6449                         continue;
6450
6451                 elem.priv = catchall->elem;
6452                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6453                 if (ret < 0)
6454                         break;
6455         }
6456
6457         return ret;
6458 }
6459
6460 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6461 {
6462         struct nft_set_iter iter = {
6463                 .genmask        = genmask,
6464                 .fn             = nft_setelem_flush,
6465         };
6466
6467         set->ops->walk(ctx, set, &iter);
6468         if (!iter.err)
6469                 iter.err = nft_set_catchall_flush(ctx, set);
6470
6471         return iter.err;
6472 }
6473
6474 static int nf_tables_delsetelem(struct sk_buff *skb,
6475                                 const struct nfnl_info *info,
6476                                 const struct nlattr * const nla[])
6477 {
6478         struct netlink_ext_ack *extack = info->extack;
6479         u8 genmask = nft_genmask_next(info->net);
6480         u8 family = info->nfmsg->nfgen_family;
6481         struct net *net = info->net;
6482         const struct nlattr *attr;
6483         struct nft_table *table;
6484         struct nft_set *set;
6485         struct nft_ctx ctx;
6486         int rem, err = 0;
6487
6488         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6489                                  genmask, NETLINK_CB(skb).portid);
6490         if (IS_ERR(table)) {
6491                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6492                 return PTR_ERR(table);
6493         }
6494
6495         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6496         if (IS_ERR(set))
6497                 return PTR_ERR(set);
6498         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6499                 return -EBUSY;
6500
6501         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6502
6503         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6504                 return nft_set_flush(&ctx, set, genmask);
6505
6506         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6507                 err = nft_del_setelem(&ctx, set, attr);
6508                 if (err < 0) {
6509                         NL_SET_BAD_ATTR(extack, attr);
6510                         break;
6511                 }
6512         }
6513         return err;
6514 }
6515
6516 void nft_set_gc_batch_release(struct rcu_head *rcu)
6517 {
6518         struct nft_set_gc_batch *gcb;
6519         unsigned int i;
6520
6521         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6522         for (i = 0; i < gcb->head.cnt; i++)
6523                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6524         kfree(gcb);
6525 }
6526
6527 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6528                                                 gfp_t gfp)
6529 {
6530         struct nft_set_gc_batch *gcb;
6531
6532         gcb = kzalloc(sizeof(*gcb), gfp);
6533         if (gcb == NULL)
6534                 return gcb;
6535         gcb->head.set = set;
6536         return gcb;
6537 }
6538
6539 /*
6540  * Stateful objects
6541  */
6542
6543 /**
6544  *      nft_register_obj- register nf_tables stateful object type
6545  *      @obj_type: object type
6546  *
6547  *      Registers the object type for use with nf_tables. Returns zero on
6548  *      success or a negative errno code otherwise.
6549  */
6550 int nft_register_obj(struct nft_object_type *obj_type)
6551 {
6552         if (obj_type->type == NFT_OBJECT_UNSPEC)
6553                 return -EINVAL;
6554
6555         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6556         list_add_rcu(&obj_type->list, &nf_tables_objects);
6557         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6558         return 0;
6559 }
6560 EXPORT_SYMBOL_GPL(nft_register_obj);
6561
6562 /**
6563  *      nft_unregister_obj - unregister nf_tables object type
6564  *      @obj_type: object type
6565  *
6566  *      Unregisters the object type for use with nf_tables.
6567  */
6568 void nft_unregister_obj(struct nft_object_type *obj_type)
6569 {
6570         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6571         list_del_rcu(&obj_type->list);
6572         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6573 }
6574 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6575
6576 struct nft_object *nft_obj_lookup(const struct net *net,
6577                                   const struct nft_table *table,
6578                                   const struct nlattr *nla, u32 objtype,
6579                                   u8 genmask)
6580 {
6581         struct nft_object_hash_key k = { .table = table };
6582         char search[NFT_OBJ_MAXNAMELEN];
6583         struct rhlist_head *tmp, *list;
6584         struct nft_object *obj;
6585
6586         nla_strscpy(search, nla, sizeof(search));
6587         k.name = search;
6588
6589         WARN_ON_ONCE(!rcu_read_lock_held() &&
6590                      !lockdep_commit_lock_is_held(net));
6591
6592         rcu_read_lock();
6593         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6594         if (!list)
6595                 goto out;
6596
6597         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6598                 if (objtype == obj->ops->type->type &&
6599                     nft_active_genmask(obj, genmask)) {
6600                         rcu_read_unlock();
6601                         return obj;
6602                 }
6603         }
6604 out:
6605         rcu_read_unlock();
6606         return ERR_PTR(-ENOENT);
6607 }
6608 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6609
6610 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6611                                                   const struct nlattr *nla,
6612                                                   u32 objtype, u8 genmask)
6613 {
6614         struct nft_object *obj;
6615
6616         list_for_each_entry(obj, &table->objects, list) {
6617                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6618                     objtype == obj->ops->type->type &&
6619                     nft_active_genmask(obj, genmask))
6620                         return obj;
6621         }
6622         return ERR_PTR(-ENOENT);
6623 }
6624
6625 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6626         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6627                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6628         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6629                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6630         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6631         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6632         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6633         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6634                                     .len = NFT_USERDATA_MAXLEN },
6635 };
6636
6637 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6638                                        const struct nft_object_type *type,
6639                                        const struct nlattr *attr)
6640 {
6641         struct nlattr **tb;
6642         const struct nft_object_ops *ops;
6643         struct nft_object *obj;
6644         int err = -ENOMEM;
6645
6646         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6647         if (!tb)
6648                 goto err1;
6649
6650         if (attr) {
6651                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6652                                                   type->policy, NULL);
6653                 if (err < 0)
6654                         goto err2;
6655         } else {
6656                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6657         }
6658
6659         if (type->select_ops) {
6660                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6661                 if (IS_ERR(ops)) {
6662                         err = PTR_ERR(ops);
6663                         goto err2;
6664                 }
6665         } else {
6666                 ops = type->ops;
6667         }
6668
6669         err = -ENOMEM;
6670         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6671         if (!obj)
6672                 goto err2;
6673
6674         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6675         if (err < 0)
6676                 goto err3;
6677
6678         obj->ops = ops;
6679
6680         kfree(tb);
6681         return obj;
6682 err3:
6683         kfree(obj);
6684 err2:
6685         kfree(tb);
6686 err1:
6687         return ERR_PTR(err);
6688 }
6689
6690 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6691                            struct nft_object *obj, bool reset)
6692 {
6693         struct nlattr *nest;
6694
6695         nest = nla_nest_start_noflag(skb, attr);
6696         if (!nest)
6697                 goto nla_put_failure;
6698         if (obj->ops->dump(skb, obj, reset) < 0)
6699                 goto nla_put_failure;
6700         nla_nest_end(skb, nest);
6701         return 0;
6702
6703 nla_put_failure:
6704         return -1;
6705 }
6706
6707 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6708 {
6709         const struct nft_object_type *type;
6710
6711         list_for_each_entry(type, &nf_tables_objects, list) {
6712                 if (objtype == type->type)
6713                         return type;
6714         }
6715         return NULL;
6716 }
6717
6718 static const struct nft_object_type *
6719 nft_obj_type_get(struct net *net, u32 objtype)
6720 {
6721         const struct nft_object_type *type;
6722
6723         type = __nft_obj_type_get(objtype);
6724         if (type != NULL && try_module_get(type->owner))
6725                 return type;
6726
6727         lockdep_nfnl_nft_mutex_not_held();
6728 #ifdef CONFIG_MODULES
6729         if (type == NULL) {
6730                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6731                         return ERR_PTR(-EAGAIN);
6732         }
6733 #endif
6734         return ERR_PTR(-ENOENT);
6735 }
6736
6737 static int nf_tables_updobj(const struct nft_ctx *ctx,
6738                             const struct nft_object_type *type,
6739                             const struct nlattr *attr,
6740                             struct nft_object *obj)
6741 {
6742         struct nft_object *newobj;
6743         struct nft_trans *trans;
6744         int err = -ENOMEM;
6745
6746         if (!try_module_get(type->owner))
6747                 return -ENOENT;
6748
6749         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6750                                 sizeof(struct nft_trans_obj));
6751         if (!trans)
6752                 goto err_trans;
6753
6754         newobj = nft_obj_init(ctx, type, attr);
6755         if (IS_ERR(newobj)) {
6756                 err = PTR_ERR(newobj);
6757                 goto err_free_trans;
6758         }
6759
6760         nft_trans_obj(trans) = obj;
6761         nft_trans_obj_update(trans) = true;
6762         nft_trans_obj_newobj(trans) = newobj;
6763         nft_trans_commit_list_add_tail(ctx->net, trans);
6764
6765         return 0;
6766
6767 err_free_trans:
6768         kfree(trans);
6769 err_trans:
6770         module_put(type->owner);
6771         return err;
6772 }
6773
6774 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6775                             const struct nlattr * const nla[])
6776 {
6777         struct netlink_ext_ack *extack = info->extack;
6778         u8 genmask = nft_genmask_next(info->net);
6779         u8 family = info->nfmsg->nfgen_family;
6780         const struct nft_object_type *type;
6781         struct net *net = info->net;
6782         struct nft_table *table;
6783         struct nft_object *obj;
6784         struct nft_ctx ctx;
6785         u32 objtype;
6786         int err;
6787
6788         if (!nla[NFTA_OBJ_TYPE] ||
6789             !nla[NFTA_OBJ_NAME] ||
6790             !nla[NFTA_OBJ_DATA])
6791                 return -EINVAL;
6792
6793         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6794                                  NETLINK_CB(skb).portid);
6795         if (IS_ERR(table)) {
6796                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6797                 return PTR_ERR(table);
6798         }
6799
6800         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6801         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6802         if (IS_ERR(obj)) {
6803                 err = PTR_ERR(obj);
6804                 if (err != -ENOENT) {
6805                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6806                         return err;
6807                 }
6808         } else {
6809                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6810                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6811                         return -EEXIST;
6812                 }
6813                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6814                         return -EOPNOTSUPP;
6815
6816                 type = __nft_obj_type_get(objtype);
6817                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6818
6819                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6820         }
6821
6822         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6823
6824         type = nft_obj_type_get(net, objtype);
6825         if (IS_ERR(type))
6826                 return PTR_ERR(type);
6827
6828         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6829         if (IS_ERR(obj)) {
6830                 err = PTR_ERR(obj);
6831                 goto err_init;
6832         }
6833         obj->key.table = table;
6834         obj->handle = nf_tables_alloc_handle(table);
6835
6836         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6837         if (!obj->key.name) {
6838                 err = -ENOMEM;
6839                 goto err_strdup;
6840         }
6841
6842         if (nla[NFTA_OBJ_USERDATA]) {
6843                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6844                 if (obj->udata == NULL)
6845                         goto err_userdata;
6846
6847                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6848         }
6849
6850         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6851         if (err < 0)
6852                 goto err_trans;
6853
6854         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6855                               nft_objname_ht_params);
6856         if (err < 0)
6857                 goto err_obj_ht;
6858
6859         list_add_tail_rcu(&obj->list, &table->objects);
6860         table->use++;
6861         return 0;
6862 err_obj_ht:
6863         /* queued in transaction log */
6864         INIT_LIST_HEAD(&obj->list);
6865         return err;
6866 err_trans:
6867         kfree(obj->udata);
6868 err_userdata:
6869         kfree(obj->key.name);
6870 err_strdup:
6871         if (obj->ops->destroy)
6872                 obj->ops->destroy(&ctx, obj);
6873         kfree(obj);
6874 err_init:
6875         module_put(type->owner);
6876         return err;
6877 }
6878
6879 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6880                                    u32 portid, u32 seq, int event, u32 flags,
6881                                    int family, const struct nft_table *table,
6882                                    struct nft_object *obj, bool reset)
6883 {
6884         struct nlmsghdr *nlh;
6885
6886         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6887         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6888                            NFNETLINK_V0, nft_base_seq(net));
6889         if (!nlh)
6890                 goto nla_put_failure;
6891
6892         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6893             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6894             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6895             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6896             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6897             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6898                          NFTA_OBJ_PAD))
6899                 goto nla_put_failure;
6900
6901         if (obj->udata &&
6902             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6903                 goto nla_put_failure;
6904
6905         nlmsg_end(skb, nlh);
6906         return 0;
6907
6908 nla_put_failure:
6909         nlmsg_trim(skb, nlh);
6910         return -1;
6911 }
6912
6913 struct nft_obj_filter {
6914         char            *table;
6915         u32             type;
6916 };
6917
6918 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6919 {
6920         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6921         const struct nft_table *table;
6922         unsigned int idx = 0, s_idx = cb->args[0];
6923         struct nft_obj_filter *filter = cb->data;
6924         struct net *net = sock_net(skb->sk);
6925         int family = nfmsg->nfgen_family;
6926         struct nftables_pernet *nft_net;
6927         struct nft_object *obj;
6928         bool reset = false;
6929
6930         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6931                 reset = true;
6932
6933         rcu_read_lock();
6934         nft_net = nft_pernet(net);
6935         cb->seq = READ_ONCE(nft_net->base_seq);
6936
6937         list_for_each_entry_rcu(table, &nft_net->tables, list) {
6938                 if (family != NFPROTO_UNSPEC && family != table->family)
6939                         continue;
6940
6941                 list_for_each_entry_rcu(obj, &table->objects, list) {
6942                         if (!nft_is_active(net, obj))
6943                                 goto cont;
6944                         if (idx < s_idx)
6945                                 goto cont;
6946                         if (idx > s_idx)
6947                                 memset(&cb->args[1], 0,
6948                                        sizeof(cb->args) - sizeof(cb->args[0]));
6949                         if (filter && filter->table &&
6950                             strcmp(filter->table, table->name))
6951                                 goto cont;
6952                         if (filter &&
6953                             filter->type != NFT_OBJECT_UNSPEC &&
6954                             obj->ops->type->type != filter->type)
6955                                 goto cont;
6956                         if (reset) {
6957                                 char *buf = kasprintf(GFP_ATOMIC,
6958                                                       "%s:%u",
6959                                                       table->name,
6960                                                       nft_net->base_seq);
6961
6962                                 audit_log_nfcfg(buf,
6963                                                 family,
6964                                                 obj->handle,
6965                                                 AUDIT_NFT_OP_OBJ_RESET,
6966                                                 GFP_ATOMIC);
6967                                 kfree(buf);
6968                         }
6969
6970                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6971                                                     cb->nlh->nlmsg_seq,
6972                                                     NFT_MSG_NEWOBJ,
6973                                                     NLM_F_MULTI | NLM_F_APPEND,
6974                                                     table->family, table,
6975                                                     obj, reset) < 0)
6976                                 goto done;
6977
6978                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6979 cont:
6980                         idx++;
6981                 }
6982         }
6983 done:
6984         rcu_read_unlock();
6985
6986         cb->args[0] = idx;
6987         return skb->len;
6988 }
6989
6990 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6991 {
6992         const struct nlattr * const *nla = cb->data;
6993         struct nft_obj_filter *filter = NULL;
6994
6995         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6996                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6997                 if (!filter)
6998                         return -ENOMEM;
6999
7000                 if (nla[NFTA_OBJ_TABLE]) {
7001                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7002                         if (!filter->table) {
7003                                 kfree(filter);
7004                                 return -ENOMEM;
7005                         }
7006                 }
7007
7008                 if (nla[NFTA_OBJ_TYPE])
7009                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7010         }
7011
7012         cb->data = filter;
7013         return 0;
7014 }
7015
7016 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7017 {
7018         struct nft_obj_filter *filter = cb->data;
7019
7020         if (filter) {
7021                 kfree(filter->table);
7022                 kfree(filter);
7023         }
7024
7025         return 0;
7026 }
7027
7028 /* called with rcu_read_lock held */
7029 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7030                             const struct nlattr * const nla[])
7031 {
7032         struct netlink_ext_ack *extack = info->extack;
7033         u8 genmask = nft_genmask_cur(info->net);
7034         u8 family = info->nfmsg->nfgen_family;
7035         const struct nft_table *table;
7036         struct net *net = info->net;
7037         struct nft_object *obj;
7038         struct sk_buff *skb2;
7039         bool reset = false;
7040         u32 objtype;
7041         int err;
7042
7043         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7044                 struct netlink_dump_control c = {
7045                         .start = nf_tables_dump_obj_start,
7046                         .dump = nf_tables_dump_obj,
7047                         .done = nf_tables_dump_obj_done,
7048                         .module = THIS_MODULE,
7049                         .data = (void *)nla,
7050                 };
7051
7052                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7053         }
7054
7055         if (!nla[NFTA_OBJ_NAME] ||
7056             !nla[NFTA_OBJ_TYPE])
7057                 return -EINVAL;
7058
7059         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7060         if (IS_ERR(table)) {
7061                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7062                 return PTR_ERR(table);
7063         }
7064
7065         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7066         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7067         if (IS_ERR(obj)) {
7068                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7069                 return PTR_ERR(obj);
7070         }
7071
7072         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7073         if (!skb2)
7074                 return -ENOMEM;
7075
7076         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7077                 reset = true;
7078
7079         if (reset) {
7080                 const struct nftables_pernet *nft_net;
7081                 char *buf;
7082
7083                 nft_net = nft_pernet(net);
7084                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7085
7086                 audit_log_nfcfg(buf,
7087                                 family,
7088                                 obj->handle,
7089                                 AUDIT_NFT_OP_OBJ_RESET,
7090                                 GFP_ATOMIC);
7091                 kfree(buf);
7092         }
7093
7094         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7095                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7096                                       family, table, obj, reset);
7097         if (err < 0)
7098                 goto err_fill_obj_info;
7099
7100         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7101
7102 err_fill_obj_info:
7103         kfree_skb(skb2);
7104         return err;
7105 }
7106
7107 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7108 {
7109         if (obj->ops->destroy)
7110                 obj->ops->destroy(ctx, obj);
7111
7112         module_put(obj->ops->type->owner);
7113         kfree(obj->key.name);
7114         kfree(obj->udata);
7115         kfree(obj);
7116 }
7117
7118 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7119                             const struct nlattr * const nla[])
7120 {
7121         struct netlink_ext_ack *extack = info->extack;
7122         u8 genmask = nft_genmask_next(info->net);
7123         u8 family = info->nfmsg->nfgen_family;
7124         struct net *net = info->net;
7125         const struct nlattr *attr;
7126         struct nft_table *table;
7127         struct nft_object *obj;
7128         struct nft_ctx ctx;
7129         u32 objtype;
7130
7131         if (!nla[NFTA_OBJ_TYPE] ||
7132             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7133                 return -EINVAL;
7134
7135         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7136                                  NETLINK_CB(skb).portid);
7137         if (IS_ERR(table)) {
7138                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7139                 return PTR_ERR(table);
7140         }
7141
7142         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7143         if (nla[NFTA_OBJ_HANDLE]) {
7144                 attr = nla[NFTA_OBJ_HANDLE];
7145                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7146         } else {
7147                 attr = nla[NFTA_OBJ_NAME];
7148                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7149         }
7150
7151         if (IS_ERR(obj)) {
7152                 NL_SET_BAD_ATTR(extack, attr);
7153                 return PTR_ERR(obj);
7154         }
7155         if (obj->use > 0) {
7156                 NL_SET_BAD_ATTR(extack, attr);
7157                 return -EBUSY;
7158         }
7159
7160         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7161
7162         return nft_delobj(&ctx, obj);
7163 }
7164
7165 void nft_obj_notify(struct net *net, const struct nft_table *table,
7166                     struct nft_object *obj, u32 portid, u32 seq, int event,
7167                     u16 flags, int family, int report, gfp_t gfp)
7168 {
7169         struct nftables_pernet *nft_net = nft_pernet(net);
7170         struct sk_buff *skb;
7171         int err;
7172         char *buf = kasprintf(gfp, "%s:%u",
7173                               table->name, nft_net->base_seq);
7174
7175         audit_log_nfcfg(buf,
7176                         family,
7177                         obj->handle,
7178                         event == NFT_MSG_NEWOBJ ?
7179                                  AUDIT_NFT_OP_OBJ_REGISTER :
7180                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7181                         gfp);
7182         kfree(buf);
7183
7184         if (!report &&
7185             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7186                 return;
7187
7188         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7189         if (skb == NULL)
7190                 goto err;
7191
7192         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7193                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7194                                       family, table, obj, false);
7195         if (err < 0) {
7196                 kfree_skb(skb);
7197                 goto err;
7198         }
7199
7200         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7201         return;
7202 err:
7203         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7204 }
7205 EXPORT_SYMBOL_GPL(nft_obj_notify);
7206
7207 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7208                                  struct nft_object *obj, int event)
7209 {
7210         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7211                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7212 }
7213
7214 /*
7215  * Flow tables
7216  */
7217 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7218 {
7219         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7220         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7221         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7222 }
7223 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7224
7225 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7226 {
7227         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7228         list_del_rcu(&type->list);
7229         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7230 }
7231 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7232
7233 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7234         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7235                                             .len = NFT_NAME_MAXLEN - 1 },
7236         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7237                                             .len = NFT_NAME_MAXLEN - 1 },
7238         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7239         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7240         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7241 };
7242
7243 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7244                                            const struct nlattr *nla, u8 genmask)
7245 {
7246         struct nft_flowtable *flowtable;
7247
7248         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7249                 if (!nla_strcmp(nla, flowtable->name) &&
7250                     nft_active_genmask(flowtable, genmask))
7251                         return flowtable;
7252         }
7253         return ERR_PTR(-ENOENT);
7254 }
7255 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7256
7257 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7258                                     struct nft_flowtable *flowtable,
7259                                     enum nft_trans_phase phase)
7260 {
7261         switch (phase) {
7262         case NFT_TRANS_PREPARE:
7263         case NFT_TRANS_ABORT:
7264         case NFT_TRANS_RELEASE:
7265                 flowtable->use--;
7266                 fallthrough;
7267         default:
7268                 return;
7269         }
7270 }
7271 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7272
7273 static struct nft_flowtable *
7274 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7275                               const struct nlattr *nla, u8 genmask)
7276 {
7277        struct nft_flowtable *flowtable;
7278
7279        list_for_each_entry(flowtable, &table->flowtables, list) {
7280                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7281                    nft_active_genmask(flowtable, genmask))
7282                        return flowtable;
7283        }
7284        return ERR_PTR(-ENOENT);
7285 }
7286
7287 struct nft_flowtable_hook {
7288         u32                     num;
7289         int                     priority;
7290         struct list_head        list;
7291 };
7292
7293 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7294         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7295         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7296         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7297 };
7298
7299 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7300                                     const struct nlattr *attr,
7301                                     struct nft_flowtable_hook *flowtable_hook,
7302                                     struct nft_flowtable *flowtable, bool add)
7303 {
7304         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7305         struct nft_hook *hook;
7306         int hooknum, priority;
7307         int err;
7308
7309         INIT_LIST_HEAD(&flowtable_hook->list);
7310
7311         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7312                                           nft_flowtable_hook_policy, NULL);
7313         if (err < 0)
7314                 return err;
7315
7316         if (add) {
7317                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7318                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7319                         return -EINVAL;
7320
7321                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7322                 if (hooknum != NF_NETDEV_INGRESS)
7323                         return -EOPNOTSUPP;
7324
7325                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7326
7327                 flowtable_hook->priority        = priority;
7328                 flowtable_hook->num             = hooknum;
7329         } else {
7330                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7331                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7332                         if (hooknum != flowtable->hooknum)
7333                                 return -EOPNOTSUPP;
7334                 }
7335
7336                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7337                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7338                         if (priority != flowtable->data.priority)
7339                                 return -EOPNOTSUPP;
7340                 }
7341
7342                 flowtable_hook->priority        = flowtable->data.priority;
7343                 flowtable_hook->num             = flowtable->hooknum;
7344         }
7345
7346         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7347                 err = nf_tables_parse_netdev_hooks(ctx->net,
7348                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7349                                                    &flowtable_hook->list);
7350                 if (err < 0)
7351                         return err;
7352         }
7353
7354         list_for_each_entry(hook, &flowtable_hook->list, list) {
7355                 hook->ops.pf            = NFPROTO_NETDEV;
7356                 hook->ops.hooknum       = flowtable_hook->num;
7357                 hook->ops.priority      = flowtable_hook->priority;
7358                 hook->ops.priv          = &flowtable->data;
7359                 hook->ops.hook          = flowtable->data.type->hook;
7360         }
7361
7362         return err;
7363 }
7364
7365 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7366 {
7367         const struct nf_flowtable_type *type;
7368
7369         list_for_each_entry(type, &nf_tables_flowtables, list) {
7370                 if (family == type->family)
7371                         return type;
7372         }
7373         return NULL;
7374 }
7375
7376 static const struct nf_flowtable_type *
7377 nft_flowtable_type_get(struct net *net, u8 family)
7378 {
7379         const struct nf_flowtable_type *type;
7380
7381         type = __nft_flowtable_type_get(family);
7382         if (type != NULL && try_module_get(type->owner))
7383                 return type;
7384
7385         lockdep_nfnl_nft_mutex_not_held();
7386 #ifdef CONFIG_MODULES
7387         if (type == NULL) {
7388                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7389                         return ERR_PTR(-EAGAIN);
7390         }
7391 #endif
7392         return ERR_PTR(-ENOENT);
7393 }
7394
7395 /* Only called from error and netdev event paths. */
7396 static void nft_unregister_flowtable_hook(struct net *net,
7397                                           struct nft_flowtable *flowtable,
7398                                           struct nft_hook *hook)
7399 {
7400         nf_unregister_net_hook(net, &hook->ops);
7401         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7402                                     FLOW_BLOCK_UNBIND);
7403 }
7404
7405 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7406                                                  struct list_head *hook_list,
7407                                                  bool release_netdev)
7408 {
7409         struct nft_hook *hook, *next;
7410
7411         list_for_each_entry_safe(hook, next, hook_list, list) {
7412                 nf_unregister_net_hook(net, &hook->ops);
7413                 if (release_netdev) {
7414                         list_del(&hook->list);
7415                         kfree_rcu(hook, rcu);
7416                 }
7417         }
7418 }
7419
7420 static void nft_unregister_flowtable_net_hooks(struct net *net,
7421                                                struct list_head *hook_list)
7422 {
7423         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7424 }
7425
7426 static int nft_register_flowtable_net_hooks(struct net *net,
7427                                             struct nft_table *table,
7428                                             struct list_head *hook_list,
7429                                             struct nft_flowtable *flowtable)
7430 {
7431         struct nft_hook *hook, *hook2, *next;
7432         struct nft_flowtable *ft;
7433         int err, i = 0;
7434
7435         list_for_each_entry(hook, hook_list, list) {
7436                 list_for_each_entry(ft, &table->flowtables, list) {
7437                         if (!nft_is_active_next(net, ft))
7438                                 continue;
7439
7440                         list_for_each_entry(hook2, &ft->hook_list, list) {
7441                                 if (hook->ops.dev == hook2->ops.dev &&
7442                                     hook->ops.pf == hook2->ops.pf) {
7443                                         err = -EEXIST;
7444                                         goto err_unregister_net_hooks;
7445                                 }
7446                         }
7447                 }
7448
7449                 err = flowtable->data.type->setup(&flowtable->data,
7450                                                   hook->ops.dev,
7451                                                   FLOW_BLOCK_BIND);
7452                 if (err < 0)
7453                         goto err_unregister_net_hooks;
7454
7455                 err = nf_register_net_hook(net, &hook->ops);
7456                 if (err < 0) {
7457                         flowtable->data.type->setup(&flowtable->data,
7458                                                     hook->ops.dev,
7459                                                     FLOW_BLOCK_UNBIND);
7460                         goto err_unregister_net_hooks;
7461                 }
7462
7463                 i++;
7464         }
7465
7466         return 0;
7467
7468 err_unregister_net_hooks:
7469         list_for_each_entry_safe(hook, next, hook_list, list) {
7470                 if (i-- <= 0)
7471                         break;
7472
7473                 nft_unregister_flowtable_hook(net, flowtable, hook);
7474                 list_del_rcu(&hook->list);
7475                 kfree_rcu(hook, rcu);
7476         }
7477
7478         return err;
7479 }
7480
7481 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7482 {
7483         struct nft_hook *hook, *next;
7484
7485         list_for_each_entry_safe(hook, next, hook_list, list) {
7486                 list_del_rcu(&hook->list);
7487                 kfree_rcu(hook, rcu);
7488         }
7489 }
7490
7491 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7492                                 struct nft_flowtable *flowtable)
7493 {
7494         const struct nlattr * const *nla = ctx->nla;
7495         struct nft_flowtable_hook flowtable_hook;
7496         struct nft_hook *hook, *next;
7497         struct nft_trans *trans;
7498         bool unregister = false;
7499         u32 flags;
7500         int err;
7501
7502         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7503                                        &flowtable_hook, flowtable, false);
7504         if (err < 0)
7505                 return err;
7506
7507         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7508                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7509                         list_del(&hook->list);
7510                         kfree(hook);
7511                 }
7512         }
7513
7514         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7515                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7516                 if (flags & ~NFT_FLOWTABLE_MASK) {
7517                         err = -EOPNOTSUPP;
7518                         goto err_flowtable_update_hook;
7519                 }
7520                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7521                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7522                         err = -EOPNOTSUPP;
7523                         goto err_flowtable_update_hook;
7524                 }
7525         } else {
7526                 flags = flowtable->data.flags;
7527         }
7528
7529         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7530                                                &flowtable_hook.list, flowtable);
7531         if (err < 0)
7532                 goto err_flowtable_update_hook;
7533
7534         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7535                                 sizeof(struct nft_trans_flowtable));
7536         if (!trans) {
7537                 unregister = true;
7538                 err = -ENOMEM;
7539                 goto err_flowtable_update_hook;
7540         }
7541
7542         nft_trans_flowtable_flags(trans) = flags;
7543         nft_trans_flowtable(trans) = flowtable;
7544         nft_trans_flowtable_update(trans) = true;
7545         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7546         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7547
7548         nft_trans_commit_list_add_tail(ctx->net, trans);
7549
7550         return 0;
7551
7552 err_flowtable_update_hook:
7553         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7554                 if (unregister)
7555                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7556                 list_del_rcu(&hook->list);
7557                 kfree_rcu(hook, rcu);
7558         }
7559
7560         return err;
7561
7562 }
7563
7564 static int nf_tables_newflowtable(struct sk_buff *skb,
7565                                   const struct nfnl_info *info,
7566                                   const struct nlattr * const nla[])
7567 {
7568         struct netlink_ext_ack *extack = info->extack;
7569         struct nft_flowtable_hook flowtable_hook;
7570         u8 genmask = nft_genmask_next(info->net);
7571         u8 family = info->nfmsg->nfgen_family;
7572         const struct nf_flowtable_type *type;
7573         struct nft_flowtable *flowtable;
7574         struct nft_hook *hook, *next;
7575         struct net *net = info->net;
7576         struct nft_table *table;
7577         struct nft_ctx ctx;
7578         int err;
7579
7580         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7581             !nla[NFTA_FLOWTABLE_NAME] ||
7582             !nla[NFTA_FLOWTABLE_HOOK])
7583                 return -EINVAL;
7584
7585         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7586                                  genmask, NETLINK_CB(skb).portid);
7587         if (IS_ERR(table)) {
7588                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7589                 return PTR_ERR(table);
7590         }
7591
7592         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7593                                          genmask);
7594         if (IS_ERR(flowtable)) {
7595                 err = PTR_ERR(flowtable);
7596                 if (err != -ENOENT) {
7597                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7598                         return err;
7599                 }
7600         } else {
7601                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7602                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7603                         return -EEXIST;
7604                 }
7605
7606                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7607
7608                 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7609         }
7610
7611         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7612
7613         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7614         if (!flowtable)
7615                 return -ENOMEM;
7616
7617         flowtable->table = table;
7618         flowtable->handle = nf_tables_alloc_handle(table);
7619         INIT_LIST_HEAD(&flowtable->hook_list);
7620
7621         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7622         if (!flowtable->name) {
7623                 err = -ENOMEM;
7624                 goto err1;
7625         }
7626
7627         type = nft_flowtable_type_get(net, family);
7628         if (IS_ERR(type)) {
7629                 err = PTR_ERR(type);
7630                 goto err2;
7631         }
7632
7633         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7634                 flowtable->data.flags =
7635                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7636                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7637                         err = -EOPNOTSUPP;
7638                         goto err3;
7639                 }
7640         }
7641
7642         write_pnet(&flowtable->data.net, net);
7643         flowtable->data.type = type;
7644         err = type->init(&flowtable->data);
7645         if (err < 0)
7646                 goto err3;
7647
7648         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7649                                        &flowtable_hook, flowtable, true);
7650         if (err < 0)
7651                 goto err4;
7652
7653         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7654         flowtable->data.priority = flowtable_hook.priority;
7655         flowtable->hooknum = flowtable_hook.num;
7656
7657         err = nft_register_flowtable_net_hooks(ctx.net, table,
7658                                                &flowtable->hook_list,
7659                                                flowtable);
7660         if (err < 0) {
7661                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7662                 goto err4;
7663         }
7664
7665         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7666         if (err < 0)
7667                 goto err5;
7668
7669         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7670         table->use++;
7671
7672         return 0;
7673 err5:
7674         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7675                 nft_unregister_flowtable_hook(net, flowtable, hook);
7676                 list_del_rcu(&hook->list);
7677                 kfree_rcu(hook, rcu);
7678         }
7679 err4:
7680         flowtable->data.type->free(&flowtable->data);
7681 err3:
7682         module_put(type->owner);
7683 err2:
7684         kfree(flowtable->name);
7685 err1:
7686         kfree(flowtable);
7687         return err;
7688 }
7689
7690 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7691 {
7692         struct nft_hook *this, *next;
7693
7694         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7695                 list_del(&this->list);
7696                 kfree(this);
7697         }
7698 }
7699
7700 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7701                                  struct nft_flowtable *flowtable)
7702 {
7703         const struct nlattr * const *nla = ctx->nla;
7704         struct nft_flowtable_hook flowtable_hook;
7705         LIST_HEAD(flowtable_del_list);
7706         struct nft_hook *this, *hook;
7707         struct nft_trans *trans;
7708         int err;
7709
7710         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7711                                        &flowtable_hook, flowtable, false);
7712         if (err < 0)
7713                 return err;
7714
7715         list_for_each_entry(this, &flowtable_hook.list, list) {
7716                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7717                 if (!hook) {
7718                         err = -ENOENT;
7719                         goto err_flowtable_del_hook;
7720                 }
7721                 list_move(&hook->list, &flowtable_del_list);
7722         }
7723
7724         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7725                                 sizeof(struct nft_trans_flowtable));
7726         if (!trans) {
7727                 err = -ENOMEM;
7728                 goto err_flowtable_del_hook;
7729         }
7730
7731         nft_trans_flowtable(trans) = flowtable;
7732         nft_trans_flowtable_update(trans) = true;
7733         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7734         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7735         nft_flowtable_hook_release(&flowtable_hook);
7736
7737         nft_trans_commit_list_add_tail(ctx->net, trans);
7738
7739         return 0;
7740
7741 err_flowtable_del_hook:
7742         list_splice(&flowtable_del_list, &flowtable->hook_list);
7743         nft_flowtable_hook_release(&flowtable_hook);
7744
7745         return err;
7746 }
7747
7748 static int nf_tables_delflowtable(struct sk_buff *skb,
7749                                   const struct nfnl_info *info,
7750                                   const struct nlattr * const nla[])
7751 {
7752         struct netlink_ext_ack *extack = info->extack;
7753         u8 genmask = nft_genmask_next(info->net);
7754         u8 family = info->nfmsg->nfgen_family;
7755         struct nft_flowtable *flowtable;
7756         struct net *net = info->net;
7757         const struct nlattr *attr;
7758         struct nft_table *table;
7759         struct nft_ctx ctx;
7760
7761         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7762             (!nla[NFTA_FLOWTABLE_NAME] &&
7763              !nla[NFTA_FLOWTABLE_HANDLE]))
7764                 return -EINVAL;
7765
7766         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7767                                  genmask, NETLINK_CB(skb).portid);
7768         if (IS_ERR(table)) {
7769                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7770                 return PTR_ERR(table);
7771         }
7772
7773         if (nla[NFTA_FLOWTABLE_HANDLE]) {
7774                 attr = nla[NFTA_FLOWTABLE_HANDLE];
7775                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7776         } else {
7777                 attr = nla[NFTA_FLOWTABLE_NAME];
7778                 flowtable = nft_flowtable_lookup(table, attr, genmask);
7779         }
7780
7781         if (IS_ERR(flowtable)) {
7782                 NL_SET_BAD_ATTR(extack, attr);
7783                 return PTR_ERR(flowtable);
7784         }
7785
7786         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7787
7788         if (nla[NFTA_FLOWTABLE_HOOK])
7789                 return nft_delflowtable_hook(&ctx, flowtable);
7790
7791         if (flowtable->use > 0) {
7792                 NL_SET_BAD_ATTR(extack, attr);
7793                 return -EBUSY;
7794         }
7795
7796         return nft_delflowtable(&ctx, flowtable);
7797 }
7798
7799 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7800                                          u32 portid, u32 seq, int event,
7801                                          u32 flags, int family,
7802                                          struct nft_flowtable *flowtable,
7803                                          struct list_head *hook_list)
7804 {
7805         struct nlattr *nest, *nest_devs;
7806         struct nft_hook *hook;
7807         struct nlmsghdr *nlh;
7808
7809         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7810         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7811                            NFNETLINK_V0, nft_base_seq(net));
7812         if (!nlh)
7813                 goto nla_put_failure;
7814
7815         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7816             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7817             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7818             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7819                          NFTA_FLOWTABLE_PAD) ||
7820             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7821                 goto nla_put_failure;
7822
7823         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7824         if (!nest)
7825                 goto nla_put_failure;
7826         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7827             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7828                 goto nla_put_failure;
7829
7830         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7831         if (!nest_devs)
7832                 goto nla_put_failure;
7833
7834         list_for_each_entry_rcu(hook, hook_list, list) {
7835                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7836                         goto nla_put_failure;
7837         }
7838         nla_nest_end(skb, nest_devs);
7839         nla_nest_end(skb, nest);
7840
7841         nlmsg_end(skb, nlh);
7842         return 0;
7843
7844 nla_put_failure:
7845         nlmsg_trim(skb, nlh);
7846         return -1;
7847 }
7848
7849 struct nft_flowtable_filter {
7850         char            *table;
7851 };
7852
7853 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7854                                     struct netlink_callback *cb)
7855 {
7856         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7857         struct nft_flowtable_filter *filter = cb->data;
7858         unsigned int idx = 0, s_idx = cb->args[0];
7859         struct net *net = sock_net(skb->sk);
7860         int family = nfmsg->nfgen_family;
7861         struct nft_flowtable *flowtable;
7862         struct nftables_pernet *nft_net;
7863         const struct nft_table *table;
7864
7865         rcu_read_lock();
7866         nft_net = nft_pernet(net);
7867         cb->seq = READ_ONCE(nft_net->base_seq);
7868
7869         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7870                 if (family != NFPROTO_UNSPEC && family != table->family)
7871                         continue;
7872
7873                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7874                         if (!nft_is_active(net, flowtable))
7875                                 goto cont;
7876                         if (idx < s_idx)
7877                                 goto cont;
7878                         if (idx > s_idx)
7879                                 memset(&cb->args[1], 0,
7880                                        sizeof(cb->args) - sizeof(cb->args[0]));
7881                         if (filter && filter->table &&
7882                             strcmp(filter->table, table->name))
7883                                 goto cont;
7884
7885                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7886                                                           cb->nlh->nlmsg_seq,
7887                                                           NFT_MSG_NEWFLOWTABLE,
7888                                                           NLM_F_MULTI | NLM_F_APPEND,
7889                                                           table->family,
7890                                                           flowtable,
7891                                                           &flowtable->hook_list) < 0)
7892                                 goto done;
7893
7894                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7895 cont:
7896                         idx++;
7897                 }
7898         }
7899 done:
7900         rcu_read_unlock();
7901
7902         cb->args[0] = idx;
7903         return skb->len;
7904 }
7905
7906 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7907 {
7908         const struct nlattr * const *nla = cb->data;
7909         struct nft_flowtable_filter *filter = NULL;
7910
7911         if (nla[NFTA_FLOWTABLE_TABLE]) {
7912                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7913                 if (!filter)
7914                         return -ENOMEM;
7915
7916                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7917                                            GFP_ATOMIC);
7918                 if (!filter->table) {
7919                         kfree(filter);
7920                         return -ENOMEM;
7921                 }
7922         }
7923
7924         cb->data = filter;
7925         return 0;
7926 }
7927
7928 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7929 {
7930         struct nft_flowtable_filter *filter = cb->data;
7931
7932         if (!filter)
7933                 return 0;
7934
7935         kfree(filter->table);
7936         kfree(filter);
7937
7938         return 0;
7939 }
7940
7941 /* called with rcu_read_lock held */
7942 static int nf_tables_getflowtable(struct sk_buff *skb,
7943                                   const struct nfnl_info *info,
7944                                   const struct nlattr * const nla[])
7945 {
7946         u8 genmask = nft_genmask_cur(info->net);
7947         u8 family = info->nfmsg->nfgen_family;
7948         struct nft_flowtable *flowtable;
7949         const struct nft_table *table;
7950         struct net *net = info->net;
7951         struct sk_buff *skb2;
7952         int err;
7953
7954         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7955                 struct netlink_dump_control c = {
7956                         .start = nf_tables_dump_flowtable_start,
7957                         .dump = nf_tables_dump_flowtable,
7958                         .done = nf_tables_dump_flowtable_done,
7959                         .module = THIS_MODULE,
7960                         .data = (void *)nla,
7961                 };
7962
7963                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7964         }
7965
7966         if (!nla[NFTA_FLOWTABLE_NAME])
7967                 return -EINVAL;
7968
7969         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7970                                  genmask, 0);
7971         if (IS_ERR(table))
7972                 return PTR_ERR(table);
7973
7974         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7975                                          genmask);
7976         if (IS_ERR(flowtable))
7977                 return PTR_ERR(flowtable);
7978
7979         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7980         if (!skb2)
7981                 return -ENOMEM;
7982
7983         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7984                                             info->nlh->nlmsg_seq,
7985                                             NFT_MSG_NEWFLOWTABLE, 0, family,
7986                                             flowtable, &flowtable->hook_list);
7987         if (err < 0)
7988                 goto err_fill_flowtable_info;
7989
7990         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7991
7992 err_fill_flowtable_info:
7993         kfree_skb(skb2);
7994         return err;
7995 }
7996
7997 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7998                                        struct nft_flowtable *flowtable,
7999                                        struct list_head *hook_list,
8000                                        int event)
8001 {
8002         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8003         struct sk_buff *skb;
8004         u16 flags = 0;
8005         int err;
8006
8007         if (!ctx->report &&
8008             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8009                 return;
8010
8011         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8012         if (skb == NULL)
8013                 goto err;
8014
8015         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8016                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8017
8018         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8019                                             ctx->seq, event, flags,
8020                                             ctx->family, flowtable, hook_list);
8021         if (err < 0) {
8022                 kfree_skb(skb);
8023                 goto err;
8024         }
8025
8026         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8027         return;
8028 err:
8029         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8030 }
8031
8032 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8033 {
8034         struct nft_hook *hook, *next;
8035
8036         flowtable->data.type->free(&flowtable->data);
8037         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8038                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8039                                             FLOW_BLOCK_UNBIND);
8040                 list_del_rcu(&hook->list);
8041                 kfree(hook);
8042         }
8043         kfree(flowtable->name);
8044         module_put(flowtable->data.type->owner);
8045         kfree(flowtable);
8046 }
8047
8048 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8049                                    u32 portid, u32 seq)
8050 {
8051         struct nftables_pernet *nft_net = nft_pernet(net);
8052         struct nlmsghdr *nlh;
8053         char buf[TASK_COMM_LEN];
8054         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8055
8056         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8057                            NFNETLINK_V0, nft_base_seq(net));
8058         if (!nlh)
8059                 goto nla_put_failure;
8060
8061         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8062             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8063             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8064                 goto nla_put_failure;
8065
8066         nlmsg_end(skb, nlh);
8067         return 0;
8068
8069 nla_put_failure:
8070         nlmsg_trim(skb, nlh);
8071         return -EMSGSIZE;
8072 }
8073
8074 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8075                                 struct nft_flowtable *flowtable)
8076 {
8077         struct nft_hook *hook;
8078
8079         list_for_each_entry(hook, &flowtable->hook_list, list) {
8080                 if (hook->ops.dev != dev)
8081                         continue;
8082
8083                 /* flow_offload_netdev_event() cleans up entries for us. */
8084                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8085                 list_del_rcu(&hook->list);
8086                 kfree_rcu(hook, rcu);
8087                 break;
8088         }
8089 }
8090
8091 static int nf_tables_flowtable_event(struct notifier_block *this,
8092                                      unsigned long event, void *ptr)
8093 {
8094         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8095         struct nft_flowtable *flowtable;
8096         struct nftables_pernet *nft_net;
8097         struct nft_table *table;
8098         struct net *net;
8099
8100         if (event != NETDEV_UNREGISTER)
8101                 return 0;
8102
8103         net = dev_net(dev);
8104         nft_net = nft_pernet(net);
8105         mutex_lock(&nft_net->commit_mutex);
8106         list_for_each_entry(table, &nft_net->tables, list) {
8107                 list_for_each_entry(flowtable, &table->flowtables, list) {
8108                         nft_flowtable_event(event, dev, flowtable);
8109                 }
8110         }
8111         mutex_unlock(&nft_net->commit_mutex);
8112
8113         return NOTIFY_DONE;
8114 }
8115
8116 static struct notifier_block nf_tables_flowtable_notifier = {
8117         .notifier_call  = nf_tables_flowtable_event,
8118 };
8119
8120 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8121                                  int event)
8122 {
8123         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8124         struct sk_buff *skb2;
8125         int err;
8126
8127         if (!nlmsg_report(nlh) &&
8128             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8129                 return;
8130
8131         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8132         if (skb2 == NULL)
8133                 goto err;
8134
8135         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8136                                       nlh->nlmsg_seq);
8137         if (err < 0) {
8138                 kfree_skb(skb2);
8139                 goto err;
8140         }
8141
8142         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8143                        nlmsg_report(nlh), GFP_KERNEL);
8144         return;
8145 err:
8146         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8147                           -ENOBUFS);
8148 }
8149
8150 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8151                             const struct nlattr * const nla[])
8152 {
8153         struct sk_buff *skb2;
8154         int err;
8155
8156         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8157         if (skb2 == NULL)
8158                 return -ENOMEM;
8159
8160         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8161                                       info->nlh->nlmsg_seq);
8162         if (err < 0)
8163                 goto err_fill_gen_info;
8164
8165         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8166
8167 err_fill_gen_info:
8168         kfree_skb(skb2);
8169         return err;
8170 }
8171
8172 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8173         [NFT_MSG_NEWTABLE] = {
8174                 .call           = nf_tables_newtable,
8175                 .type           = NFNL_CB_BATCH,
8176                 .attr_count     = NFTA_TABLE_MAX,
8177                 .policy         = nft_table_policy,
8178         },
8179         [NFT_MSG_GETTABLE] = {
8180                 .call           = nf_tables_gettable,
8181                 .type           = NFNL_CB_RCU,
8182                 .attr_count     = NFTA_TABLE_MAX,
8183                 .policy         = nft_table_policy,
8184         },
8185         [NFT_MSG_DELTABLE] = {
8186                 .call           = nf_tables_deltable,
8187                 .type           = NFNL_CB_BATCH,
8188                 .attr_count     = NFTA_TABLE_MAX,
8189                 .policy         = nft_table_policy,
8190         },
8191         [NFT_MSG_NEWCHAIN] = {
8192                 .call           = nf_tables_newchain,
8193                 .type           = NFNL_CB_BATCH,
8194                 .attr_count     = NFTA_CHAIN_MAX,
8195                 .policy         = nft_chain_policy,
8196         },
8197         [NFT_MSG_GETCHAIN] = {
8198                 .call           = nf_tables_getchain,
8199                 .type           = NFNL_CB_RCU,
8200                 .attr_count     = NFTA_CHAIN_MAX,
8201                 .policy         = nft_chain_policy,
8202         },
8203         [NFT_MSG_DELCHAIN] = {
8204                 .call           = nf_tables_delchain,
8205                 .type           = NFNL_CB_BATCH,
8206                 .attr_count     = NFTA_CHAIN_MAX,
8207                 .policy         = nft_chain_policy,
8208         },
8209         [NFT_MSG_NEWRULE] = {
8210                 .call           = nf_tables_newrule,
8211                 .type           = NFNL_CB_BATCH,
8212                 .attr_count     = NFTA_RULE_MAX,
8213                 .policy         = nft_rule_policy,
8214         },
8215         [NFT_MSG_GETRULE] = {
8216                 .call           = nf_tables_getrule,
8217                 .type           = NFNL_CB_RCU,
8218                 .attr_count     = NFTA_RULE_MAX,
8219                 .policy         = nft_rule_policy,
8220         },
8221         [NFT_MSG_DELRULE] = {
8222                 .call           = nf_tables_delrule,
8223                 .type           = NFNL_CB_BATCH,
8224                 .attr_count     = NFTA_RULE_MAX,
8225                 .policy         = nft_rule_policy,
8226         },
8227         [NFT_MSG_NEWSET] = {
8228                 .call           = nf_tables_newset,
8229                 .type           = NFNL_CB_BATCH,
8230                 .attr_count     = NFTA_SET_MAX,
8231                 .policy         = nft_set_policy,
8232         },
8233         [NFT_MSG_GETSET] = {
8234                 .call           = nf_tables_getset,
8235                 .type           = NFNL_CB_RCU,
8236                 .attr_count     = NFTA_SET_MAX,
8237                 .policy         = nft_set_policy,
8238         },
8239         [NFT_MSG_DELSET] = {
8240                 .call           = nf_tables_delset,
8241                 .type           = NFNL_CB_BATCH,
8242                 .attr_count     = NFTA_SET_MAX,
8243                 .policy         = nft_set_policy,
8244         },
8245         [NFT_MSG_NEWSETELEM] = {
8246                 .call           = nf_tables_newsetelem,
8247                 .type           = NFNL_CB_BATCH,
8248                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8249                 .policy         = nft_set_elem_list_policy,
8250         },
8251         [NFT_MSG_GETSETELEM] = {
8252                 .call           = nf_tables_getsetelem,
8253                 .type           = NFNL_CB_RCU,
8254                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8255                 .policy         = nft_set_elem_list_policy,
8256         },
8257         [NFT_MSG_DELSETELEM] = {
8258                 .call           = nf_tables_delsetelem,
8259                 .type           = NFNL_CB_BATCH,
8260                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8261                 .policy         = nft_set_elem_list_policy,
8262         },
8263         [NFT_MSG_GETGEN] = {
8264                 .call           = nf_tables_getgen,
8265                 .type           = NFNL_CB_RCU,
8266         },
8267         [NFT_MSG_NEWOBJ] = {
8268                 .call           = nf_tables_newobj,
8269                 .type           = NFNL_CB_BATCH,
8270                 .attr_count     = NFTA_OBJ_MAX,
8271                 .policy         = nft_obj_policy,
8272         },
8273         [NFT_MSG_GETOBJ] = {
8274                 .call           = nf_tables_getobj,
8275                 .type           = NFNL_CB_RCU,
8276                 .attr_count     = NFTA_OBJ_MAX,
8277                 .policy         = nft_obj_policy,
8278         },
8279         [NFT_MSG_DELOBJ] = {
8280                 .call           = nf_tables_delobj,
8281                 .type           = NFNL_CB_BATCH,
8282                 .attr_count     = NFTA_OBJ_MAX,
8283                 .policy         = nft_obj_policy,
8284         },
8285         [NFT_MSG_GETOBJ_RESET] = {
8286                 .call           = nf_tables_getobj,
8287                 .type           = NFNL_CB_RCU,
8288                 .attr_count     = NFTA_OBJ_MAX,
8289                 .policy         = nft_obj_policy,
8290         },
8291         [NFT_MSG_NEWFLOWTABLE] = {
8292                 .call           = nf_tables_newflowtable,
8293                 .type           = NFNL_CB_BATCH,
8294                 .attr_count     = NFTA_FLOWTABLE_MAX,
8295                 .policy         = nft_flowtable_policy,
8296         },
8297         [NFT_MSG_GETFLOWTABLE] = {
8298                 .call           = nf_tables_getflowtable,
8299                 .type           = NFNL_CB_RCU,
8300                 .attr_count     = NFTA_FLOWTABLE_MAX,
8301                 .policy         = nft_flowtable_policy,
8302         },
8303         [NFT_MSG_DELFLOWTABLE] = {
8304                 .call           = nf_tables_delflowtable,
8305                 .type           = NFNL_CB_BATCH,
8306                 .attr_count     = NFTA_FLOWTABLE_MAX,
8307                 .policy         = nft_flowtable_policy,
8308         },
8309 };
8310
8311 static int nf_tables_validate(struct net *net)
8312 {
8313         struct nftables_pernet *nft_net = nft_pernet(net);
8314         struct nft_table *table;
8315
8316         switch (nft_net->validate_state) {
8317         case NFT_VALIDATE_SKIP:
8318                 break;
8319         case NFT_VALIDATE_NEED:
8320                 nft_validate_state_update(net, NFT_VALIDATE_DO);
8321                 fallthrough;
8322         case NFT_VALIDATE_DO:
8323                 list_for_each_entry(table, &nft_net->tables, list) {
8324                         if (nft_table_validate(net, table) < 0)
8325                                 return -EAGAIN;
8326                 }
8327                 break;
8328         }
8329
8330         return 0;
8331 }
8332
8333 /* a drop policy has to be deferred until all rules have been activated,
8334  * otherwise a large ruleset that contains a drop-policy base chain will
8335  * cause all packets to get dropped until the full transaction has been
8336  * processed.
8337  *
8338  * We defer the drop policy until the transaction has been finalized.
8339  */
8340 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8341 {
8342         struct nft_base_chain *basechain;
8343
8344         if (nft_trans_chain_policy(trans) != NF_DROP)
8345                 return;
8346
8347         if (!nft_is_base_chain(trans->ctx.chain))
8348                 return;
8349
8350         basechain = nft_base_chain(trans->ctx.chain);
8351         basechain->policy = NF_DROP;
8352 }
8353
8354 static void nft_chain_commit_update(struct nft_trans *trans)
8355 {
8356         struct nft_base_chain *basechain;
8357
8358         if (nft_trans_chain_name(trans)) {
8359                 rhltable_remove(&trans->ctx.table->chains_ht,
8360                                 &trans->ctx.chain->rhlhead,
8361                                 nft_chain_ht_params);
8362                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8363                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8364                                     trans->ctx.chain->name,
8365                                     &trans->ctx.chain->rhlhead,
8366                                     nft_chain_ht_params);
8367         }
8368
8369         if (!nft_is_base_chain(trans->ctx.chain))
8370                 return;
8371
8372         nft_chain_stats_replace(trans);
8373
8374         basechain = nft_base_chain(trans->ctx.chain);
8375
8376         switch (nft_trans_chain_policy(trans)) {
8377         case NF_DROP:
8378         case NF_ACCEPT:
8379                 basechain->policy = nft_trans_chain_policy(trans);
8380                 break;
8381         }
8382 }
8383
8384 static void nft_obj_commit_update(struct nft_trans *trans)
8385 {
8386         struct nft_object *newobj;
8387         struct nft_object *obj;
8388
8389         obj = nft_trans_obj(trans);
8390         newobj = nft_trans_obj_newobj(trans);
8391
8392         if (obj->ops->update)
8393                 obj->ops->update(obj, newobj);
8394
8395         nft_obj_destroy(&trans->ctx, newobj);
8396 }
8397
8398 static void nft_commit_release(struct nft_trans *trans)
8399 {
8400         switch (trans->msg_type) {
8401         case NFT_MSG_DELTABLE:
8402                 nf_tables_table_destroy(&trans->ctx);
8403                 break;
8404         case NFT_MSG_NEWCHAIN:
8405                 free_percpu(nft_trans_chain_stats(trans));
8406                 kfree(nft_trans_chain_name(trans));
8407                 break;
8408         case NFT_MSG_DELCHAIN:
8409                 nf_tables_chain_destroy(&trans->ctx);
8410                 break;
8411         case NFT_MSG_DELRULE:
8412                 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8413                         nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8414
8415                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8416                 break;
8417         case NFT_MSG_DELSET:
8418                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8419                 break;
8420         case NFT_MSG_DELSETELEM:
8421                 nf_tables_set_elem_destroy(&trans->ctx,
8422                                            nft_trans_elem_set(trans),
8423                                            nft_trans_elem(trans).priv);
8424                 break;
8425         case NFT_MSG_DELOBJ:
8426                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8427                 break;
8428         case NFT_MSG_DELFLOWTABLE:
8429                 if (nft_trans_flowtable_update(trans))
8430                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8431                 else
8432                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8433                 break;
8434         }
8435
8436         if (trans->put_net)
8437                 put_net(trans->ctx.net);
8438
8439         kfree(trans);
8440 }
8441
8442 static void nf_tables_trans_destroy_work(struct work_struct *w)
8443 {
8444         struct nft_trans *trans, *next;
8445         LIST_HEAD(head);
8446
8447         spin_lock(&nf_tables_destroy_list_lock);
8448         list_splice_init(&nf_tables_destroy_list, &head);
8449         spin_unlock(&nf_tables_destroy_list_lock);
8450
8451         if (list_empty(&head))
8452                 return;
8453
8454         synchronize_rcu();
8455
8456         list_for_each_entry_safe(trans, next, &head, list) {
8457                 list_del(&trans->list);
8458                 nft_commit_release(trans);
8459         }
8460 }
8461
8462 void nf_tables_trans_destroy_flush_work(void)
8463 {
8464         flush_work(&trans_destroy_work);
8465 }
8466 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8467
8468 static bool nft_expr_reduce(struct nft_regs_track *track,
8469                             const struct nft_expr *expr)
8470 {
8471         return false;
8472 }
8473
8474 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8475 {
8476         const struct nft_expr *expr, *last;
8477         struct nft_regs_track track = {};
8478         unsigned int size, data_size;
8479         void *data, *data_boundary;
8480         struct nft_rule_dp *prule;
8481         struct nft_rule *rule;
8482
8483         /* already handled or inactive chain? */
8484         if (chain->blob_next || !nft_is_active_next(net, chain))
8485                 return 0;
8486
8487         data_size = 0;
8488         list_for_each_entry(rule, &chain->rules, list) {
8489                 if (nft_is_active_next(net, rule)) {
8490                         data_size += sizeof(*prule) + rule->dlen;
8491                         if (data_size > INT_MAX)
8492                                 return -ENOMEM;
8493                 }
8494         }
8495         data_size += offsetof(struct nft_rule_dp, data);        /* last rule */
8496
8497         chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8498         if (!chain->blob_next)
8499                 return -ENOMEM;
8500
8501         data = (void *)chain->blob_next->data;
8502         data_boundary = data + data_size;
8503         size = 0;
8504
8505         list_for_each_entry(rule, &chain->rules, list) {
8506                 if (!nft_is_active_next(net, rule))
8507                         continue;
8508
8509                 prule = (struct nft_rule_dp *)data;
8510                 data += offsetof(struct nft_rule_dp, data);
8511                 if (WARN_ON_ONCE(data > data_boundary))
8512                         return -ENOMEM;
8513
8514                 size = 0;
8515                 track.last = nft_expr_last(rule);
8516                 nft_rule_for_each_expr(expr, last, rule) {
8517                         track.cur = expr;
8518
8519                         if (nft_expr_reduce(&track, expr)) {
8520                                 expr = track.cur;
8521                                 continue;
8522                         }
8523
8524                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8525                                 return -ENOMEM;
8526
8527                         memcpy(data + size, expr, expr->ops->size);
8528                         size += expr->ops->size;
8529                 }
8530                 if (WARN_ON_ONCE(size >= 1 << 12))
8531                         return -ENOMEM;
8532
8533                 prule->handle = rule->handle;
8534                 prule->dlen = size;
8535                 prule->is_last = 0;
8536
8537                 data += size;
8538                 size = 0;
8539                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8540         }
8541
8542         prule = (struct nft_rule_dp *)data;
8543         data += offsetof(struct nft_rule_dp, data);
8544         if (WARN_ON_ONCE(data > data_boundary))
8545                 return -ENOMEM;
8546
8547         nft_last_rule(chain->blob_next, prule);
8548
8549         return 0;
8550 }
8551
8552 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8553 {
8554         struct nftables_pernet *nft_net = nft_pernet(net);
8555         struct nft_trans *trans, *next;
8556
8557         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8558                 struct nft_chain *chain = trans->ctx.chain;
8559
8560                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8561                     trans->msg_type == NFT_MSG_DELRULE) {
8562                         kvfree(chain->blob_next);
8563                         chain->blob_next = NULL;
8564                 }
8565         }
8566 }
8567
8568 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8569 {
8570         struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8571
8572         kvfree(o->blob);
8573 }
8574
8575 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8576 {
8577         struct nft_rules_old *old;
8578
8579         /* rcu_head is after end marker */
8580         old = (void *)blob + sizeof(*blob) + blob->size;
8581         old->blob = blob;
8582
8583         call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8584 }
8585
8586 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8587 {
8588         struct nft_rule_blob *g0, *g1;
8589         bool next_genbit;
8590
8591         next_genbit = nft_gencursor_next(net);
8592
8593         g0 = rcu_dereference_protected(chain->blob_gen_0,
8594                                        lockdep_commit_lock_is_held(net));
8595         g1 = rcu_dereference_protected(chain->blob_gen_1,
8596                                        lockdep_commit_lock_is_held(net));
8597
8598         /* No changes to this chain? */
8599         if (chain->blob_next == NULL) {
8600                 /* chain had no change in last or next generation */
8601                 if (g0 == g1)
8602                         return;
8603                 /*
8604                  * chain had no change in this generation; make sure next
8605                  * one uses same rules as current generation.
8606                  */
8607                 if (next_genbit) {
8608                         rcu_assign_pointer(chain->blob_gen_1, g0);
8609                         nf_tables_commit_chain_free_rules_old(g1);
8610                 } else {
8611                         rcu_assign_pointer(chain->blob_gen_0, g1);
8612                         nf_tables_commit_chain_free_rules_old(g0);
8613                 }
8614
8615                 return;
8616         }
8617
8618         if (next_genbit)
8619                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8620         else
8621                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8622
8623         chain->blob_next = NULL;
8624
8625         if (g0 == g1)
8626                 return;
8627
8628         if (next_genbit)
8629                 nf_tables_commit_chain_free_rules_old(g1);
8630         else
8631                 nf_tables_commit_chain_free_rules_old(g0);
8632 }
8633
8634 static void nft_obj_del(struct nft_object *obj)
8635 {
8636         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8637         list_del_rcu(&obj->list);
8638 }
8639
8640 void nft_chain_del(struct nft_chain *chain)
8641 {
8642         struct nft_table *table = chain->table;
8643
8644         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8645                                      nft_chain_ht_params));
8646         list_del_rcu(&chain->list);
8647 }
8648
8649 static void nf_tables_module_autoload_cleanup(struct net *net)
8650 {
8651         struct nftables_pernet *nft_net = nft_pernet(net);
8652         struct nft_module_request *req, *next;
8653
8654         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8655         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8656                 WARN_ON_ONCE(!req->done);
8657                 list_del(&req->list);
8658                 kfree(req);
8659         }
8660 }
8661
8662 static void nf_tables_commit_release(struct net *net)
8663 {
8664         struct nftables_pernet *nft_net = nft_pernet(net);
8665         struct nft_trans *trans;
8666
8667         /* all side effects have to be made visible.
8668          * For example, if a chain named 'foo' has been deleted, a
8669          * new transaction must not find it anymore.
8670          *
8671          * Memory reclaim happens asynchronously from work queue
8672          * to prevent expensive synchronize_rcu() in commit phase.
8673          */
8674         if (list_empty(&nft_net->commit_list)) {
8675                 nf_tables_module_autoload_cleanup(net);
8676                 mutex_unlock(&nft_net->commit_mutex);
8677                 return;
8678         }
8679
8680         trans = list_last_entry(&nft_net->commit_list,
8681                                 struct nft_trans, list);
8682         get_net(trans->ctx.net);
8683         WARN_ON_ONCE(trans->put_net);
8684
8685         trans->put_net = true;
8686         spin_lock(&nf_tables_destroy_list_lock);
8687         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8688         spin_unlock(&nf_tables_destroy_list_lock);
8689
8690         nf_tables_module_autoload_cleanup(net);
8691         schedule_work(&trans_destroy_work);
8692
8693         mutex_unlock(&nft_net->commit_mutex);
8694 }
8695
8696 static void nft_commit_notify(struct net *net, u32 portid)
8697 {
8698         struct nftables_pernet *nft_net = nft_pernet(net);
8699         struct sk_buff *batch_skb = NULL, *nskb, *skb;
8700         unsigned char *data;
8701         int len;
8702
8703         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8704                 if (!batch_skb) {
8705 new_batch:
8706                         batch_skb = skb;
8707                         len = NLMSG_GOODSIZE - skb->len;
8708                         list_del(&skb->list);
8709                         continue;
8710                 }
8711                 len -= skb->len;
8712                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8713                         data = skb_put(batch_skb, skb->len);
8714                         memcpy(data, skb->data, skb->len);
8715                         list_del(&skb->list);
8716                         kfree_skb(skb);
8717                         continue;
8718                 }
8719                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8720                                NFT_CB(batch_skb).report, GFP_KERNEL);
8721                 goto new_batch;
8722         }
8723
8724         if (batch_skb) {
8725                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8726                                NFT_CB(batch_skb).report, GFP_KERNEL);
8727         }
8728
8729         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8730 }
8731
8732 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8733                                         struct nft_table *table)
8734 {
8735         struct nft_audit_data *adp;
8736
8737         list_for_each_entry(adp, adl, list) {
8738                 if (adp->table == table)
8739                         return 0;
8740         }
8741         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8742         if (!adp)
8743                 return -ENOMEM;
8744         adp->table = table;
8745         list_add(&adp->list, adl);
8746         return 0;
8747 }
8748
8749 static void nf_tables_commit_audit_free(struct list_head *adl)
8750 {
8751         struct nft_audit_data *adp, *adn;
8752
8753         list_for_each_entry_safe(adp, adn, adl, list) {
8754                 list_del(&adp->list);
8755                 kfree(adp);
8756         }
8757 }
8758
8759 static void nf_tables_commit_audit_collect(struct list_head *adl,
8760                                            struct nft_table *table, u32 op)
8761 {
8762         struct nft_audit_data *adp;
8763
8764         list_for_each_entry(adp, adl, list) {
8765                 if (adp->table == table)
8766                         goto found;
8767         }
8768         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8769         return;
8770 found:
8771         adp->entries++;
8772         if (!adp->op || adp->op > op)
8773                 adp->op = op;
8774 }
8775
8776 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8777
8778 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8779 {
8780         struct nft_audit_data *adp, *adn;
8781         char aubuf[AUNFTABLENAMELEN];
8782
8783         list_for_each_entry_safe(adp, adn, adl, list) {
8784                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8785                          generation);
8786                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8787                                 nft2audit_op[adp->op], GFP_KERNEL);
8788                 list_del(&adp->list);
8789                 kfree(adp);
8790         }
8791 }
8792
8793 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8794 {
8795         struct nftables_pernet *nft_net = nft_pernet(net);
8796         struct nft_trans *trans, *next;
8797         struct nft_trans_elem *te;
8798         struct nft_chain *chain;
8799         struct nft_table *table;
8800         unsigned int base_seq;
8801         LIST_HEAD(adl);
8802         int err;
8803
8804         if (list_empty(&nft_net->commit_list)) {
8805                 mutex_unlock(&nft_net->commit_mutex);
8806                 return 0;
8807         }
8808
8809         /* 0. Validate ruleset, otherwise roll back for error reporting. */
8810         if (nf_tables_validate(net) < 0)
8811                 return -EAGAIN;
8812
8813         err = nft_flow_rule_offload_commit(net);
8814         if (err < 0)
8815                 return err;
8816
8817         /* 1.  Allocate space for next generation rules_gen_X[] */
8818         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8819                 int ret;
8820
8821                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8822                 if (ret) {
8823                         nf_tables_commit_chain_prepare_cancel(net);
8824                         nf_tables_commit_audit_free(&adl);
8825                         return ret;
8826                 }
8827                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8828                     trans->msg_type == NFT_MSG_DELRULE) {
8829                         chain = trans->ctx.chain;
8830
8831                         ret = nf_tables_commit_chain_prepare(net, chain);
8832                         if (ret < 0) {
8833                                 nf_tables_commit_chain_prepare_cancel(net);
8834                                 nf_tables_commit_audit_free(&adl);
8835                                 return ret;
8836                         }
8837                 }
8838         }
8839
8840         /* step 2.  Make rules_gen_X visible to packet path */
8841         list_for_each_entry(table, &nft_net->tables, list) {
8842                 list_for_each_entry(chain, &table->chains, list)
8843                         nf_tables_commit_chain(net, chain);
8844         }
8845
8846         /*
8847          * Bump generation counter, invalidate any dump in progress.
8848          * Cannot fail after this point.
8849          */
8850         base_seq = READ_ONCE(nft_net->base_seq);
8851         while (++base_seq == 0)
8852                 ;
8853
8854         WRITE_ONCE(nft_net->base_seq, base_seq);
8855
8856         /* step 3. Start new generation, rules_gen_X now in use. */
8857         net->nft.gencursor = nft_gencursor_next(net);
8858
8859         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8860                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8861                                                trans->msg_type);
8862                 switch (trans->msg_type) {
8863                 case NFT_MSG_NEWTABLE:
8864                         if (nft_trans_table_update(trans)) {
8865                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8866                                         nft_trans_destroy(trans);
8867                                         break;
8868                                 }
8869                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8870                                         nf_tables_table_disable(net, trans->ctx.table);
8871
8872                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8873                         } else {
8874                                 nft_clear(net, trans->ctx.table);
8875                         }
8876                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8877                         nft_trans_destroy(trans);
8878                         break;
8879                 case NFT_MSG_DELTABLE:
8880                         list_del_rcu(&trans->ctx.table->list);
8881                         nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8882                         break;
8883                 case NFT_MSG_NEWCHAIN:
8884                         if (nft_trans_chain_update(trans)) {
8885                                 nft_chain_commit_update(trans);
8886                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8887                                 /* trans destroyed after rcu grace period */
8888                         } else {
8889                                 nft_chain_commit_drop_policy(trans);
8890                                 nft_clear(net, trans->ctx.chain);
8891                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8892                                 nft_trans_destroy(trans);
8893                         }
8894                         break;
8895                 case NFT_MSG_DELCHAIN:
8896                         nft_chain_del(trans->ctx.chain);
8897                         nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8898                         nf_tables_unregister_hook(trans->ctx.net,
8899                                                   trans->ctx.table,
8900                                                   trans->ctx.chain);
8901                         break;
8902                 case NFT_MSG_NEWRULE:
8903                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
8904                         nf_tables_rule_notify(&trans->ctx,
8905                                               nft_trans_rule(trans),
8906                                               NFT_MSG_NEWRULE);
8907                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8908                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8909
8910                         nft_trans_destroy(trans);
8911                         break;
8912                 case NFT_MSG_DELRULE:
8913                         list_del_rcu(&nft_trans_rule(trans)->list);
8914                         nf_tables_rule_notify(&trans->ctx,
8915                                               nft_trans_rule(trans),
8916                                               NFT_MSG_DELRULE);
8917                         nft_rule_expr_deactivate(&trans->ctx,
8918                                                  nft_trans_rule(trans),
8919                                                  NFT_TRANS_COMMIT);
8920                         break;
8921                 case NFT_MSG_NEWSET:
8922                         nft_clear(net, nft_trans_set(trans));
8923                         /* This avoids hitting -EBUSY when deleting the table
8924                          * from the transaction.
8925                          */
8926                         if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8927                             !list_empty(&nft_trans_set(trans)->bindings))
8928                                 trans->ctx.table->use--;
8929
8930                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8931                                              NFT_MSG_NEWSET, GFP_KERNEL);
8932                         nft_trans_destroy(trans);
8933                         break;
8934                 case NFT_MSG_DELSET:
8935                         list_del_rcu(&nft_trans_set(trans)->list);
8936                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8937                                              NFT_MSG_DELSET, GFP_KERNEL);
8938                         break;
8939                 case NFT_MSG_NEWSETELEM:
8940                         te = (struct nft_trans_elem *)trans->data;
8941
8942                         nft_setelem_activate(net, te->set, &te->elem);
8943                         nf_tables_setelem_notify(&trans->ctx, te->set,
8944                                                  &te->elem,
8945                                                  NFT_MSG_NEWSETELEM);
8946                         nft_trans_destroy(trans);
8947                         break;
8948                 case NFT_MSG_DELSETELEM:
8949                         te = (struct nft_trans_elem *)trans->data;
8950
8951                         nf_tables_setelem_notify(&trans->ctx, te->set,
8952                                                  &te->elem,
8953                                                  NFT_MSG_DELSETELEM);
8954                         nft_setelem_remove(net, te->set, &te->elem);
8955                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8956                                 atomic_dec(&te->set->nelems);
8957                                 te->set->ndeact--;
8958                         }
8959                         break;
8960                 case NFT_MSG_NEWOBJ:
8961                         if (nft_trans_obj_update(trans)) {
8962                                 nft_obj_commit_update(trans);
8963                                 nf_tables_obj_notify(&trans->ctx,
8964                                                      nft_trans_obj(trans),
8965                                                      NFT_MSG_NEWOBJ);
8966                         } else {
8967                                 nft_clear(net, nft_trans_obj(trans));
8968                                 nf_tables_obj_notify(&trans->ctx,
8969                                                      nft_trans_obj(trans),
8970                                                      NFT_MSG_NEWOBJ);
8971                                 nft_trans_destroy(trans);
8972                         }
8973                         break;
8974                 case NFT_MSG_DELOBJ:
8975                         nft_obj_del(nft_trans_obj(trans));
8976                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8977                                              NFT_MSG_DELOBJ);
8978                         break;
8979                 case NFT_MSG_NEWFLOWTABLE:
8980                         if (nft_trans_flowtable_update(trans)) {
8981                                 nft_trans_flowtable(trans)->data.flags =
8982                                         nft_trans_flowtable_flags(trans);
8983                                 nf_tables_flowtable_notify(&trans->ctx,
8984                                                            nft_trans_flowtable(trans),
8985                                                            &nft_trans_flowtable_hooks(trans),
8986                                                            NFT_MSG_NEWFLOWTABLE);
8987                                 list_splice(&nft_trans_flowtable_hooks(trans),
8988                                             &nft_trans_flowtable(trans)->hook_list);
8989                         } else {
8990                                 nft_clear(net, nft_trans_flowtable(trans));
8991                                 nf_tables_flowtable_notify(&trans->ctx,
8992                                                            nft_trans_flowtable(trans),
8993                                                            &nft_trans_flowtable(trans)->hook_list,
8994                                                            NFT_MSG_NEWFLOWTABLE);
8995                         }
8996                         nft_trans_destroy(trans);
8997                         break;
8998                 case NFT_MSG_DELFLOWTABLE:
8999                         if (nft_trans_flowtable_update(trans)) {
9000                                 nf_tables_flowtable_notify(&trans->ctx,
9001                                                            nft_trans_flowtable(trans),
9002                                                            &nft_trans_flowtable_hooks(trans),
9003                                                            NFT_MSG_DELFLOWTABLE);
9004                                 nft_unregister_flowtable_net_hooks(net,
9005                                                                    &nft_trans_flowtable_hooks(trans));
9006                         } else {
9007                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9008                                 nf_tables_flowtable_notify(&trans->ctx,
9009                                                            nft_trans_flowtable(trans),
9010                                                            &nft_trans_flowtable(trans)->hook_list,
9011                                                            NFT_MSG_DELFLOWTABLE);
9012                                 nft_unregister_flowtable_net_hooks(net,
9013                                                 &nft_trans_flowtable(trans)->hook_list);
9014                         }
9015                         break;
9016                 }
9017         }
9018
9019         nft_commit_notify(net, NETLINK_CB(skb).portid);
9020         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9021         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9022         nf_tables_commit_release(net);
9023
9024         return 0;
9025 }
9026
9027 static void nf_tables_module_autoload(struct net *net)
9028 {
9029         struct nftables_pernet *nft_net = nft_pernet(net);
9030         struct nft_module_request *req, *next;
9031         LIST_HEAD(module_list);
9032
9033         list_splice_init(&nft_net->module_list, &module_list);
9034         mutex_unlock(&nft_net->commit_mutex);
9035         list_for_each_entry_safe(req, next, &module_list, list) {
9036                 request_module("%s", req->module);
9037                 req->done = true;
9038         }
9039         mutex_lock(&nft_net->commit_mutex);
9040         list_splice(&module_list, &nft_net->module_list);
9041 }
9042
9043 static void nf_tables_abort_release(struct nft_trans *trans)
9044 {
9045         switch (trans->msg_type) {
9046         case NFT_MSG_NEWTABLE:
9047                 nf_tables_table_destroy(&trans->ctx);
9048                 break;
9049         case NFT_MSG_NEWCHAIN:
9050                 nf_tables_chain_destroy(&trans->ctx);
9051                 break;
9052         case NFT_MSG_NEWRULE:
9053                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9054                 break;
9055         case NFT_MSG_NEWSET:
9056                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9057                 break;
9058         case NFT_MSG_NEWSETELEM:
9059                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9060                                      nft_trans_elem(trans).priv, true);
9061                 break;
9062         case NFT_MSG_NEWOBJ:
9063                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9064                 break;
9065         case NFT_MSG_NEWFLOWTABLE:
9066                 if (nft_trans_flowtable_update(trans))
9067                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9068                 else
9069                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9070                 break;
9071         }
9072         kfree(trans);
9073 }
9074
9075 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9076 {
9077         struct nftables_pernet *nft_net = nft_pernet(net);
9078         struct nft_trans *trans, *next;
9079         struct nft_trans_elem *te;
9080
9081         if (action == NFNL_ABORT_VALIDATE &&
9082             nf_tables_validate(net) < 0)
9083                 return -EAGAIN;
9084
9085         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9086                                          list) {
9087                 switch (trans->msg_type) {
9088                 case NFT_MSG_NEWTABLE:
9089                         if (nft_trans_table_update(trans)) {
9090                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9091                                         nft_trans_destroy(trans);
9092                                         break;
9093                                 }
9094                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9095                                         nf_tables_table_disable(net, trans->ctx.table);
9096                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9097                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9098                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9099                                 }
9100                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9101                                 nft_trans_destroy(trans);
9102                         } else {
9103                                 list_del_rcu(&trans->ctx.table->list);
9104                         }
9105                         break;
9106                 case NFT_MSG_DELTABLE:
9107                         nft_clear(trans->ctx.net, trans->ctx.table);
9108                         nft_trans_destroy(trans);
9109                         break;
9110                 case NFT_MSG_NEWCHAIN:
9111                         if (nft_trans_chain_update(trans)) {
9112                                 free_percpu(nft_trans_chain_stats(trans));
9113                                 kfree(nft_trans_chain_name(trans));
9114                                 nft_trans_destroy(trans);
9115                         } else {
9116                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9117                                         nft_trans_destroy(trans);
9118                                         break;
9119                                 }
9120                                 trans->ctx.table->use--;
9121                                 nft_chain_del(trans->ctx.chain);
9122                                 nf_tables_unregister_hook(trans->ctx.net,
9123                                                           trans->ctx.table,
9124                                                           trans->ctx.chain);
9125                         }
9126                         break;
9127                 case NFT_MSG_DELCHAIN:
9128                         trans->ctx.table->use++;
9129                         nft_clear(trans->ctx.net, trans->ctx.chain);
9130                         nft_trans_destroy(trans);
9131                         break;
9132                 case NFT_MSG_NEWRULE:
9133                         trans->ctx.chain->use--;
9134                         list_del_rcu(&nft_trans_rule(trans)->list);
9135                         nft_rule_expr_deactivate(&trans->ctx,
9136                                                  nft_trans_rule(trans),
9137                                                  NFT_TRANS_ABORT);
9138                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9139                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9140                         break;
9141                 case NFT_MSG_DELRULE:
9142                         trans->ctx.chain->use++;
9143                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9144                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9145                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9146                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9147
9148                         nft_trans_destroy(trans);
9149                         break;
9150                 case NFT_MSG_NEWSET:
9151                         trans->ctx.table->use--;
9152                         if (nft_trans_set_bound(trans)) {
9153                                 nft_trans_destroy(trans);
9154                                 break;
9155                         }
9156                         list_del_rcu(&nft_trans_set(trans)->list);
9157                         break;
9158                 case NFT_MSG_DELSET:
9159                         trans->ctx.table->use++;
9160                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9161                         nft_trans_destroy(trans);
9162                         break;
9163                 case NFT_MSG_NEWSETELEM:
9164                         if (nft_trans_elem_set_bound(trans)) {
9165                                 nft_trans_destroy(trans);
9166                                 break;
9167                         }
9168                         te = (struct nft_trans_elem *)trans->data;
9169                         nft_setelem_remove(net, te->set, &te->elem);
9170                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9171                                 atomic_dec(&te->set->nelems);
9172                         break;
9173                 case NFT_MSG_DELSETELEM:
9174                         te = (struct nft_trans_elem *)trans->data;
9175
9176                         nft_setelem_data_activate(net, te->set, &te->elem);
9177                         nft_setelem_activate(net, te->set, &te->elem);
9178                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9179                                 te->set->ndeact--;
9180
9181                         nft_trans_destroy(trans);
9182                         break;
9183                 case NFT_MSG_NEWOBJ:
9184                         if (nft_trans_obj_update(trans)) {
9185                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9186                                 nft_trans_destroy(trans);
9187                         } else {
9188                                 trans->ctx.table->use--;
9189                                 nft_obj_del(nft_trans_obj(trans));
9190                         }
9191                         break;
9192                 case NFT_MSG_DELOBJ:
9193                         trans->ctx.table->use++;
9194                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9195                         nft_trans_destroy(trans);
9196                         break;
9197                 case NFT_MSG_NEWFLOWTABLE:
9198                         if (nft_trans_flowtable_update(trans)) {
9199                                 nft_unregister_flowtable_net_hooks(net,
9200                                                 &nft_trans_flowtable_hooks(trans));
9201                         } else {
9202                                 trans->ctx.table->use--;
9203                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9204                                 nft_unregister_flowtable_net_hooks(net,
9205                                                 &nft_trans_flowtable(trans)->hook_list);
9206                         }
9207                         break;
9208                 case NFT_MSG_DELFLOWTABLE:
9209                         if (nft_trans_flowtable_update(trans)) {
9210                                 list_splice(&nft_trans_flowtable_hooks(trans),
9211                                             &nft_trans_flowtable(trans)->hook_list);
9212                         } else {
9213                                 trans->ctx.table->use++;
9214                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9215                         }
9216                         nft_trans_destroy(trans);
9217                         break;
9218                 }
9219         }
9220
9221         synchronize_rcu();
9222
9223         list_for_each_entry_safe_reverse(trans, next,
9224                                          &nft_net->commit_list, list) {
9225                 list_del(&trans->list);
9226                 nf_tables_abort_release(trans);
9227         }
9228
9229         if (action == NFNL_ABORT_AUTOLOAD)
9230                 nf_tables_module_autoload(net);
9231         else
9232                 nf_tables_module_autoload_cleanup(net);
9233
9234         return 0;
9235 }
9236
9237 static void nf_tables_cleanup(struct net *net)
9238 {
9239         nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9240 }
9241
9242 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9243                            enum nfnl_abort_action action)
9244 {
9245         struct nftables_pernet *nft_net = nft_pernet(net);
9246         int ret = __nf_tables_abort(net, action);
9247
9248         mutex_unlock(&nft_net->commit_mutex);
9249
9250         return ret;
9251 }
9252
9253 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9254 {
9255         struct nftables_pernet *nft_net = nft_pernet(net);
9256         bool genid_ok;
9257
9258         mutex_lock(&nft_net->commit_mutex);
9259
9260         genid_ok = genid == 0 || nft_net->base_seq == genid;
9261         if (!genid_ok)
9262                 mutex_unlock(&nft_net->commit_mutex);
9263
9264         /* else, commit mutex has to be released by commit or abort function */
9265         return genid_ok;
9266 }
9267
9268 static const struct nfnetlink_subsystem nf_tables_subsys = {
9269         .name           = "nf_tables",
9270         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9271         .cb_count       = NFT_MSG_MAX,
9272         .cb             = nf_tables_cb,
9273         .commit         = nf_tables_commit,
9274         .abort          = nf_tables_abort,
9275         .cleanup        = nf_tables_cleanup,
9276         .valid_genid    = nf_tables_valid_genid,
9277         .owner          = THIS_MODULE,
9278 };
9279
9280 int nft_chain_validate_dependency(const struct nft_chain *chain,
9281                                   enum nft_chain_types type)
9282 {
9283         const struct nft_base_chain *basechain;
9284
9285         if (nft_is_base_chain(chain)) {
9286                 basechain = nft_base_chain(chain);
9287                 if (basechain->type->type != type)
9288                         return -EOPNOTSUPP;
9289         }
9290         return 0;
9291 }
9292 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9293
9294 int nft_chain_validate_hooks(const struct nft_chain *chain,
9295                              unsigned int hook_flags)
9296 {
9297         struct nft_base_chain *basechain;
9298
9299         if (nft_is_base_chain(chain)) {
9300                 basechain = nft_base_chain(chain);
9301
9302                 if ((1 << basechain->ops.hooknum) & hook_flags)
9303                         return 0;
9304
9305                 return -EOPNOTSUPP;
9306         }
9307
9308         return 0;
9309 }
9310 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9311
9312 /*
9313  * Loop detection - walk through the ruleset beginning at the destination chain
9314  * of a new jump until either the source chain is reached (loop) or all
9315  * reachable chains have been traversed.
9316  *
9317  * The loop check is performed whenever a new jump verdict is added to an
9318  * expression or verdict map or a verdict map is bound to a new chain.
9319  */
9320
9321 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9322                                  const struct nft_chain *chain);
9323
9324 static int nft_check_loops(const struct nft_ctx *ctx,
9325                            const struct nft_set_ext *ext)
9326 {
9327         const struct nft_data *data;
9328         int ret;
9329
9330         data = nft_set_ext_data(ext);
9331         switch (data->verdict.code) {
9332         case NFT_JUMP:
9333         case NFT_GOTO:
9334                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9335                 break;
9336         default:
9337                 ret = 0;
9338                 break;
9339         }
9340
9341         return ret;
9342 }
9343
9344 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9345                                         struct nft_set *set,
9346                                         const struct nft_set_iter *iter,
9347                                         struct nft_set_elem *elem)
9348 {
9349         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9350
9351         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9352             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9353                 return 0;
9354
9355         return nft_check_loops(ctx, ext);
9356 }
9357
9358 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9359                                   struct nft_set *set)
9360 {
9361         u8 genmask = nft_genmask_next(ctx->net);
9362         struct nft_set_elem_catchall *catchall;
9363         struct nft_set_ext *ext;
9364         int ret = 0;
9365
9366         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9367                 ext = nft_set_elem_ext(set, catchall->elem);
9368                 if (!nft_set_elem_active(ext, genmask))
9369                         continue;
9370
9371                 ret = nft_check_loops(ctx, ext);
9372                 if (ret < 0)
9373                         return ret;
9374         }
9375
9376         return ret;
9377 }
9378
9379 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9380                                  const struct nft_chain *chain)
9381 {
9382         const struct nft_rule *rule;
9383         const struct nft_expr *expr, *last;
9384         struct nft_set *set;
9385         struct nft_set_binding *binding;
9386         struct nft_set_iter iter;
9387
9388         if (ctx->chain == chain)
9389                 return -ELOOP;
9390
9391         list_for_each_entry(rule, &chain->rules, list) {
9392                 nft_rule_for_each_expr(expr, last, rule) {
9393                         struct nft_immediate_expr *priv;
9394                         const struct nft_data *data;
9395                         int err;
9396
9397                         if (strcmp(expr->ops->type->name, "immediate"))
9398                                 continue;
9399
9400                         priv = nft_expr_priv(expr);
9401                         if (priv->dreg != NFT_REG_VERDICT)
9402                                 continue;
9403
9404                         data = &priv->data;
9405                         switch (data->verdict.code) {
9406                         case NFT_JUMP:
9407                         case NFT_GOTO:
9408                                 err = nf_tables_check_loops(ctx,
9409                                                         data->verdict.chain);
9410                                 if (err < 0)
9411                                         return err;
9412                                 break;
9413                         default:
9414                                 break;
9415                         }
9416                 }
9417         }
9418
9419         list_for_each_entry(set, &ctx->table->sets, list) {
9420                 if (!nft_is_active_next(ctx->net, set))
9421                         continue;
9422                 if (!(set->flags & NFT_SET_MAP) ||
9423                     set->dtype != NFT_DATA_VERDICT)
9424                         continue;
9425
9426                 list_for_each_entry(binding, &set->bindings, list) {
9427                         if (!(binding->flags & NFT_SET_MAP) ||
9428                             binding->chain != chain)
9429                                 continue;
9430
9431                         iter.genmask    = nft_genmask_next(ctx->net);
9432                         iter.skip       = 0;
9433                         iter.count      = 0;
9434                         iter.err        = 0;
9435                         iter.fn         = nf_tables_loop_check_setelem;
9436
9437                         set->ops->walk(ctx, set, &iter);
9438                         if (!iter.err)
9439                                 iter.err = nft_set_catchall_loops(ctx, set);
9440
9441                         if (iter.err < 0)
9442                                 return iter.err;
9443                 }
9444         }
9445
9446         return 0;
9447 }
9448
9449 /**
9450  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9451  *
9452  *      @attr: netlink attribute to fetch value from
9453  *      @max: maximum value to be stored in dest
9454  *      @dest: pointer to the variable
9455  *
9456  *      Parse, check and store a given u32 netlink attribute into variable.
9457  *      This function returns -ERANGE if the value goes over maximum value.
9458  *      Otherwise a 0 is returned and the attribute value is stored in the
9459  *      destination variable.
9460  */
9461 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9462 {
9463         u32 val;
9464
9465         val = ntohl(nla_get_be32(attr));
9466         if (val > max)
9467                 return -ERANGE;
9468
9469         *dest = val;
9470         return 0;
9471 }
9472 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9473
9474 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9475 {
9476         unsigned int reg;
9477
9478         reg = ntohl(nla_get_be32(attr));
9479         switch (reg) {
9480         case NFT_REG_VERDICT...NFT_REG_4:
9481                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9482                 break;
9483         case NFT_REG32_00...NFT_REG32_15:
9484                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9485                 break;
9486         default:
9487                 return -ERANGE;
9488         }
9489
9490         return 0;
9491 }
9492
9493 /**
9494  *      nft_dump_register - dump a register value to a netlink attribute
9495  *
9496  *      @skb: socket buffer
9497  *      @attr: attribute number
9498  *      @reg: register number
9499  *
9500  *      Construct a netlink attribute containing the register number. For
9501  *      compatibility reasons, register numbers being a multiple of 4 are
9502  *      translated to the corresponding 128 bit register numbers.
9503  */
9504 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9505 {
9506         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9507                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9508         else
9509                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9510
9511         return nla_put_be32(skb, attr, htonl(reg));
9512 }
9513 EXPORT_SYMBOL_GPL(nft_dump_register);
9514
9515 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9516 {
9517         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9518                 return -EINVAL;
9519         if (len == 0)
9520                 return -EINVAL;
9521         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9522                 return -ERANGE;
9523
9524         return 0;
9525 }
9526
9527 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9528 {
9529         u32 reg;
9530         int err;
9531
9532         err = nft_parse_register(attr, &reg);
9533         if (err < 0)
9534                 return err;
9535
9536         err = nft_validate_register_load(reg, len);
9537         if (err < 0)
9538                 return err;
9539
9540         *sreg = reg;
9541         return 0;
9542 }
9543 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9544
9545 static int nft_validate_register_store(const struct nft_ctx *ctx,
9546                                        enum nft_registers reg,
9547                                        const struct nft_data *data,
9548                                        enum nft_data_types type,
9549                                        unsigned int len)
9550 {
9551         int err;
9552
9553         switch (reg) {
9554         case NFT_REG_VERDICT:
9555                 if (type != NFT_DATA_VERDICT)
9556                         return -EINVAL;
9557
9558                 if (data != NULL &&
9559                     (data->verdict.code == NFT_GOTO ||
9560                      data->verdict.code == NFT_JUMP)) {
9561                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9562                         if (err < 0)
9563                                 return err;
9564                 }
9565
9566                 return 0;
9567         default:
9568                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9569                         return -EINVAL;
9570                 if (len == 0)
9571                         return -EINVAL;
9572                 if (reg * NFT_REG32_SIZE + len >
9573                     sizeof_field(struct nft_regs, data))
9574                         return -ERANGE;
9575
9576                 if (data != NULL && type != NFT_DATA_VALUE)
9577                         return -EINVAL;
9578                 return 0;
9579         }
9580 }
9581
9582 int nft_parse_register_store(const struct nft_ctx *ctx,
9583                              const struct nlattr *attr, u8 *dreg,
9584                              const struct nft_data *data,
9585                              enum nft_data_types type, unsigned int len)
9586 {
9587         int err;
9588         u32 reg;
9589
9590         err = nft_parse_register(attr, &reg);
9591         if (err < 0)
9592                 return err;
9593
9594         err = nft_validate_register_store(ctx, reg, data, type, len);
9595         if (err < 0)
9596                 return err;
9597
9598         *dreg = reg;
9599         return 0;
9600 }
9601 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9602
9603 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9604         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9605         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9606                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9607         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9608 };
9609
9610 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9611                             struct nft_data_desc *desc, const struct nlattr *nla)
9612 {
9613         u8 genmask = nft_genmask_next(ctx->net);
9614         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9615         struct nft_chain *chain;
9616         int err;
9617
9618         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9619                                           nft_verdict_policy, NULL);
9620         if (err < 0)
9621                 return err;
9622
9623         if (!tb[NFTA_VERDICT_CODE])
9624                 return -EINVAL;
9625         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9626
9627         switch (data->verdict.code) {
9628         default:
9629                 switch (data->verdict.code & NF_VERDICT_MASK) {
9630                 case NF_ACCEPT:
9631                 case NF_DROP:
9632                 case NF_QUEUE:
9633                         break;
9634                 default:
9635                         return -EINVAL;
9636                 }
9637                 fallthrough;
9638         case NFT_CONTINUE:
9639         case NFT_BREAK:
9640         case NFT_RETURN:
9641                 break;
9642         case NFT_JUMP:
9643         case NFT_GOTO:
9644                 if (tb[NFTA_VERDICT_CHAIN]) {
9645                         chain = nft_chain_lookup(ctx->net, ctx->table,
9646                                                  tb[NFTA_VERDICT_CHAIN],
9647                                                  genmask);
9648                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9649                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9650                                                       tb[NFTA_VERDICT_CHAIN_ID]);
9651                         if (IS_ERR(chain))
9652                                 return PTR_ERR(chain);
9653                 } else {
9654                         return -EINVAL;
9655                 }
9656
9657                 if (IS_ERR(chain))
9658                         return PTR_ERR(chain);
9659                 if (nft_is_base_chain(chain))
9660                         return -EOPNOTSUPP;
9661                 if (nft_chain_is_bound(chain))
9662                         return -EINVAL;
9663                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9664                     chain->flags & NFT_CHAIN_BINDING)
9665                         return -EINVAL;
9666
9667                 chain->use++;
9668                 data->verdict.chain = chain;
9669                 break;
9670         }
9671
9672         desc->len = sizeof(data->verdict);
9673
9674         return 0;
9675 }
9676
9677 static void nft_verdict_uninit(const struct nft_data *data)
9678 {
9679         struct nft_chain *chain;
9680         struct nft_rule *rule;
9681
9682         switch (data->verdict.code) {
9683         case NFT_JUMP:
9684         case NFT_GOTO:
9685                 chain = data->verdict.chain;
9686                 chain->use--;
9687
9688                 if (!nft_chain_is_bound(chain))
9689                         break;
9690
9691                 chain->table->use--;
9692                 list_for_each_entry(rule, &chain->rules, list)
9693                         chain->use--;
9694
9695                 nft_chain_del(chain);
9696                 break;
9697         }
9698 }
9699
9700 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9701 {
9702         struct nlattr *nest;
9703
9704         nest = nla_nest_start_noflag(skb, type);
9705         if (!nest)
9706                 goto nla_put_failure;
9707
9708         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9709                 goto nla_put_failure;
9710
9711         switch (v->code) {
9712         case NFT_JUMP:
9713         case NFT_GOTO:
9714                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9715                                    v->chain->name))
9716                         goto nla_put_failure;
9717         }
9718         nla_nest_end(skb, nest);
9719         return 0;
9720
9721 nla_put_failure:
9722         return -1;
9723 }
9724
9725 static int nft_value_init(const struct nft_ctx *ctx,
9726                           struct nft_data *data, struct nft_data_desc *desc,
9727                           const struct nlattr *nla)
9728 {
9729         unsigned int len;
9730
9731         len = nla_len(nla);
9732         if (len == 0)
9733                 return -EINVAL;
9734         if (len > desc->size)
9735                 return -EOVERFLOW;
9736         if (desc->len) {
9737                 if (len != desc->len)
9738                         return -EINVAL;
9739         } else {
9740                 desc->len = len;
9741         }
9742
9743         nla_memcpy(data->data, nla, len);
9744
9745         return 0;
9746 }
9747
9748 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9749                           unsigned int len)
9750 {
9751         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9752 }
9753
9754 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9755         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
9756         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
9757 };
9758
9759 /**
9760  *      nft_data_init - parse nf_tables data netlink attributes
9761  *
9762  *      @ctx: context of the expression using the data
9763  *      @data: destination struct nft_data
9764  *      @desc: data description
9765  *      @nla: netlink attribute containing data
9766  *
9767  *      Parse the netlink data attributes and initialize a struct nft_data.
9768  *      The type and length of data are returned in the data description.
9769  *
9770  *      The caller can indicate that it only wants to accept data of type
9771  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
9772  */
9773 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9774                   struct nft_data_desc *desc, const struct nlattr *nla)
9775 {
9776         struct nlattr *tb[NFTA_DATA_MAX + 1];
9777         int err;
9778
9779         if (WARN_ON_ONCE(!desc->size))
9780                 return -EINVAL;
9781
9782         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9783                                           nft_data_policy, NULL);
9784         if (err < 0)
9785                 return err;
9786
9787         if (tb[NFTA_DATA_VALUE]) {
9788                 if (desc->type != NFT_DATA_VALUE)
9789                         return -EINVAL;
9790
9791                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9792         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9793                 if (desc->type != NFT_DATA_VERDICT)
9794                         return -EINVAL;
9795
9796                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9797         } else {
9798                 err = -EINVAL;
9799         }
9800
9801         return err;
9802 }
9803 EXPORT_SYMBOL_GPL(nft_data_init);
9804
9805 /**
9806  *      nft_data_release - release a nft_data item
9807  *
9808  *      @data: struct nft_data to release
9809  *      @type: type of data
9810  *
9811  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9812  *      all others need to be released by calling this function.
9813  */
9814 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9815 {
9816         if (type < NFT_DATA_VERDICT)
9817                 return;
9818         switch (type) {
9819         case NFT_DATA_VERDICT:
9820                 return nft_verdict_uninit(data);
9821         default:
9822                 WARN_ON(1);
9823         }
9824 }
9825 EXPORT_SYMBOL_GPL(nft_data_release);
9826
9827 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9828                   enum nft_data_types type, unsigned int len)
9829 {
9830         struct nlattr *nest;
9831         int err;
9832
9833         nest = nla_nest_start_noflag(skb, attr);
9834         if (nest == NULL)
9835                 return -1;
9836
9837         switch (type) {
9838         case NFT_DATA_VALUE:
9839                 err = nft_value_dump(skb, data, len);
9840                 break;
9841         case NFT_DATA_VERDICT:
9842                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9843                 break;
9844         default:
9845                 err = -EINVAL;
9846                 WARN_ON(1);
9847         }
9848
9849         nla_nest_end(skb, nest);
9850         return err;
9851 }
9852 EXPORT_SYMBOL_GPL(nft_data_dump);
9853
9854 int __nft_release_basechain(struct nft_ctx *ctx)
9855 {
9856         struct nft_rule *rule, *nr;
9857
9858         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9859                 return 0;
9860
9861         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9862         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9863                 list_del(&rule->list);
9864                 ctx->chain->use--;
9865                 nf_tables_rule_release(ctx, rule);
9866         }
9867         nft_chain_del(ctx->chain);
9868         ctx->table->use--;
9869         nf_tables_chain_destroy(ctx);
9870
9871         return 0;
9872 }
9873 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9874
9875 static void __nft_release_hook(struct net *net, struct nft_table *table)
9876 {
9877         struct nft_flowtable *flowtable;
9878         struct nft_chain *chain;
9879
9880         list_for_each_entry(chain, &table->chains, list)
9881                 __nf_tables_unregister_hook(net, table, chain, true);
9882         list_for_each_entry(flowtable, &table->flowtables, list)
9883                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9884                                                      true);
9885 }
9886
9887 static void __nft_release_hooks(struct net *net)
9888 {
9889         struct nftables_pernet *nft_net = nft_pernet(net);
9890         struct nft_table *table;
9891
9892         list_for_each_entry(table, &nft_net->tables, list) {
9893                 if (nft_table_has_owner(table))
9894                         continue;
9895
9896                 __nft_release_hook(net, table);
9897         }
9898 }
9899
9900 static void __nft_release_table(struct net *net, struct nft_table *table)
9901 {
9902         struct nft_flowtable *flowtable, *nf;
9903         struct nft_chain *chain, *nc;
9904         struct nft_object *obj, *ne;
9905         struct nft_rule *rule, *nr;
9906         struct nft_set *set, *ns;
9907         struct nft_ctx ctx = {
9908                 .net    = net,
9909                 .family = NFPROTO_NETDEV,
9910         };
9911
9912         ctx.family = table->family;
9913         ctx.table = table;
9914         list_for_each_entry(chain, &table->chains, list) {
9915                 ctx.chain = chain;
9916                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9917                         list_del(&rule->list);
9918                         chain->use--;
9919                         nf_tables_rule_release(&ctx, rule);
9920                 }
9921         }
9922         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9923                 list_del(&flowtable->list);
9924                 table->use--;
9925                 nf_tables_flowtable_destroy(flowtable);
9926         }
9927         list_for_each_entry_safe(set, ns, &table->sets, list) {
9928                 list_del(&set->list);
9929                 table->use--;
9930                 nft_set_destroy(&ctx, set);
9931         }
9932         list_for_each_entry_safe(obj, ne, &table->objects, list) {
9933                 nft_obj_del(obj);
9934                 table->use--;
9935                 nft_obj_destroy(&ctx, obj);
9936         }
9937         list_for_each_entry_safe(chain, nc, &table->chains, list) {
9938                 ctx.chain = chain;
9939                 nft_chain_del(chain);
9940                 table->use--;
9941                 nf_tables_chain_destroy(&ctx);
9942         }
9943         nf_tables_table_destroy(&ctx);
9944 }
9945
9946 static void __nft_release_tables(struct net *net)
9947 {
9948         struct nftables_pernet *nft_net = nft_pernet(net);
9949         struct nft_table *table, *nt;
9950
9951         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9952                 if (nft_table_has_owner(table))
9953                         continue;
9954
9955                 list_del(&table->list);
9956
9957                 __nft_release_table(net, table);
9958         }
9959 }
9960
9961 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9962                             void *ptr)
9963 {
9964         struct nft_table *table, *to_delete[8];
9965         struct nftables_pernet *nft_net;
9966         struct netlink_notify *n = ptr;
9967         struct net *net = n->net;
9968         unsigned int deleted;
9969         bool restart = false;
9970
9971         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9972                 return NOTIFY_DONE;
9973
9974         nft_net = nft_pernet(net);
9975         deleted = 0;
9976         mutex_lock(&nft_net->commit_mutex);
9977 again:
9978         list_for_each_entry(table, &nft_net->tables, list) {
9979                 if (nft_table_has_owner(table) &&
9980                     n->portid == table->nlpid) {
9981                         __nft_release_hook(net, table);
9982                         list_del_rcu(&table->list);
9983                         to_delete[deleted++] = table;
9984                         if (deleted >= ARRAY_SIZE(to_delete))
9985                                 break;
9986                 }
9987         }
9988         if (deleted) {
9989                 restart = deleted >= ARRAY_SIZE(to_delete);
9990                 synchronize_rcu();
9991                 while (deleted)
9992                         __nft_release_table(net, to_delete[--deleted]);
9993
9994                 if (restart)
9995                         goto again;
9996         }
9997         mutex_unlock(&nft_net->commit_mutex);
9998
9999         return NOTIFY_DONE;
10000 }
10001
10002 static struct notifier_block nft_nl_notifier = {
10003         .notifier_call  = nft_rcv_nl_event,
10004 };
10005
10006 static int __net_init nf_tables_init_net(struct net *net)
10007 {
10008         struct nftables_pernet *nft_net = nft_pernet(net);
10009
10010         INIT_LIST_HEAD(&nft_net->tables);
10011         INIT_LIST_HEAD(&nft_net->commit_list);
10012         INIT_LIST_HEAD(&nft_net->module_list);
10013         INIT_LIST_HEAD(&nft_net->notify_list);
10014         mutex_init(&nft_net->commit_mutex);
10015         nft_net->base_seq = 1;
10016         nft_net->validate_state = NFT_VALIDATE_SKIP;
10017
10018         return 0;
10019 }
10020
10021 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10022 {
10023         struct nftables_pernet *nft_net = nft_pernet(net);
10024
10025         mutex_lock(&nft_net->commit_mutex);
10026         __nft_release_hooks(net);
10027         mutex_unlock(&nft_net->commit_mutex);
10028 }
10029
10030 static void __net_exit nf_tables_exit_net(struct net *net)
10031 {
10032         struct nftables_pernet *nft_net = nft_pernet(net);
10033
10034         mutex_lock(&nft_net->commit_mutex);
10035         if (!list_empty(&nft_net->commit_list))
10036                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10037         __nft_release_tables(net);
10038         mutex_unlock(&nft_net->commit_mutex);
10039         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10040         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10041         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10042 }
10043
10044 static struct pernet_operations nf_tables_net_ops = {
10045         .init           = nf_tables_init_net,
10046         .pre_exit       = nf_tables_pre_exit_net,
10047         .exit           = nf_tables_exit_net,
10048         .id             = &nf_tables_net_id,
10049         .size           = sizeof(struct nftables_pernet),
10050 };
10051
10052 static int __init nf_tables_module_init(void)
10053 {
10054         int err;
10055
10056         err = register_pernet_subsys(&nf_tables_net_ops);
10057         if (err < 0)
10058                 return err;
10059
10060         err = nft_chain_filter_init();
10061         if (err < 0)
10062                 goto err_chain_filter;
10063
10064         err = nf_tables_core_module_init();
10065         if (err < 0)
10066                 goto err_core_module;
10067
10068         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10069         if (err < 0)
10070                 goto err_netdev_notifier;
10071
10072         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10073         if (err < 0)
10074                 goto err_rht_objname;
10075
10076         err = nft_offload_init();
10077         if (err < 0)
10078                 goto err_offload;
10079
10080         err = netlink_register_notifier(&nft_nl_notifier);
10081         if (err < 0)
10082                 goto err_netlink_notifier;
10083
10084         /* must be last */
10085         err = nfnetlink_subsys_register(&nf_tables_subsys);
10086         if (err < 0)
10087                 goto err_nfnl_subsys;
10088
10089         nft_chain_route_init();
10090
10091         return err;
10092
10093 err_nfnl_subsys:
10094         netlink_unregister_notifier(&nft_nl_notifier);
10095 err_netlink_notifier:
10096         nft_offload_exit();
10097 err_offload:
10098         rhltable_destroy(&nft_objname_ht);
10099 err_rht_objname:
10100         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10101 err_netdev_notifier:
10102         nf_tables_core_module_exit();
10103 err_core_module:
10104         nft_chain_filter_fini();
10105 err_chain_filter:
10106         unregister_pernet_subsys(&nf_tables_net_ops);
10107         return err;
10108 }
10109
10110 static void __exit nf_tables_module_exit(void)
10111 {
10112         nfnetlink_subsys_unregister(&nf_tables_subsys);
10113         netlink_unregister_notifier(&nft_nl_notifier);
10114         nft_offload_exit();
10115         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10116         nft_chain_filter_fini();
10117         nft_chain_route_fini();
10118         unregister_pernet_subsys(&nf_tables_net_ops);
10119         cancel_work_sync(&trans_destroy_work);
10120         rcu_barrier();
10121         rhltable_destroy(&nft_objname_ht);
10122         nf_tables_core_module_exit();
10123 }
10124
10125 module_init(nf_tables_module_init);
10126 module_exit(nf_tables_module_exit);
10127
10128 MODULE_LICENSE("GPL");
10129 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10130 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);