net/netfilter/nf_tables_api.c

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