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                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3869                     trans->ctx.chain == chain &&
3870                     id == nft_trans_rule_id(trans))
3871                         return nft_trans_rule(trans);
3872         }
3873         return ERR_PTR(-ENOENT);
3874 }
3875
3876 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3877                              const struct nlattr * const nla[])
3878 {
3879         struct netlink_ext_ack *extack = info->extack;
3880         u8 genmask = nft_genmask_next(info->net);
3881         u8 family = info->nfmsg->nfgen_family;
3882         struct nft_chain *chain = NULL;
3883         struct net *net = info->net;
3884         struct nft_table *table;
3885         struct nft_rule *rule;
3886         struct nft_ctx ctx;
3887         int err = 0;
3888
3889         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3890                                  NETLINK_CB(skb).portid);
3891         if (IS_ERR(table)) {
3892                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3893                 return PTR_ERR(table);
3894         }
3895
3896         if (nla[NFTA_RULE_CHAIN]) {
3897                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3898                                          genmask);
3899                 if (IS_ERR(chain)) {
3900                         if (PTR_ERR(chain) == -ENOENT &&
3901                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3902                                 return 0;
3903
3904                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3905                         return PTR_ERR(chain);
3906                 }
3907                 if (nft_chain_is_bound(chain))
3908                         return -EOPNOTSUPP;
3909         }
3910
3911         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3912
3913         if (chain) {
3914                 if (nla[NFTA_RULE_HANDLE]) {
3915                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3916                         if (IS_ERR(rule)) {
3917                                 if (PTR_ERR(rule) == -ENOENT &&
3918                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3919                                         return 0;
3920
3921                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3922                                 return PTR_ERR(rule);
3923                         }
3924
3925                         err = nft_delrule(&ctx, rule);
3926                 } else if (nla[NFTA_RULE_ID]) {
3927                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3928                         if (IS_ERR(rule)) {
3929                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3930                                 return PTR_ERR(rule);
3931                         }
3932
3933                         err = nft_delrule(&ctx, rule);
3934                 } else {
3935                         err = nft_delrule_by_chain(&ctx);
3936                 }
3937         } else {
3938                 list_for_each_entry(chain, &table->chains, list) {
3939                         if (!nft_is_active_next(net, chain))
3940                                 continue;
3941
3942                         ctx.chain = chain;
3943                         err = nft_delrule_by_chain(&ctx);
3944                         if (err < 0)
3945                                 break;
3946                 }
3947         }
3948
3949         return err;
3950 }
3951
3952 /*
3953  * Sets
3954  */
3955 static const struct nft_set_type *nft_set_types[] = {
3956         &nft_set_hash_fast_type,
3957         &nft_set_hash_type,
3958         &nft_set_rhash_type,
3959         &nft_set_bitmap_type,
3960         &nft_set_rbtree_type,
3961 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3962         &nft_set_pipapo_avx2_type,
3963 #endif
3964         &nft_set_pipapo_type,
3965 };
3966
3967 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3968                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3969                                  NFT_SET_EVAL)
3970
3971 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3972 {
3973         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3974 }
3975
3976 /*
3977  * Select a set implementation based on the data characteristics and the
3978  * given policy. The total memory use might not be known if no size is
3979  * given, in that case the amount of memory per element is used.
3980  */
3981 static const struct nft_set_ops *
3982 nft_select_set_ops(const struct nft_ctx *ctx,
3983                    const struct nlattr * const nla[],
3984                    const struct nft_set_desc *desc)
3985 {
3986         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3987         const struct nft_set_ops *ops, *bops;
3988         struct nft_set_estimate est, best;
3989         const struct nft_set_type *type;
3990         u32 flags = 0;
3991         int i;
3992
3993         lockdep_assert_held(&nft_net->commit_mutex);
3994         lockdep_nfnl_nft_mutex_not_held();
3995
3996         if (nla[NFTA_SET_FLAGS] != NULL)
3997                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3998
3999         bops        = NULL;
4000         best.size   = ~0;
4001         best.lookup = ~0;
4002         best.space  = ~0;
4003
4004         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4005                 type = nft_set_types[i];
4006                 ops = &type->ops;
4007
4008                 if (!nft_set_ops_candidate(type, flags))
4009                         continue;
4010                 if (!ops->estimate(desc, flags, &est))
4011                         continue;
4012
4013                 switch (desc->policy) {
4014                 case NFT_SET_POL_PERFORMANCE:
4015                         if (est.lookup < best.lookup)
4016                                 break;
4017                         if (est.lookup == best.lookup &&
4018                             est.space < best.space)
4019                                 break;
4020                         continue;
4021                 case NFT_SET_POL_MEMORY:
4022                         if (!desc->size) {
4023                                 if (est.space < best.space)
4024                                         break;
4025                                 if (est.space == best.space &&
4026                                     est.lookup < best.lookup)
4027                                         break;
4028                         } else if (est.size < best.size || !bops) {
4029                                 break;
4030                         }
4031                         continue;
4032                 default:
4033                         break;
4034                 }
4035
4036                 bops = ops;
4037                 best = est;
4038         }
4039
4040         if (bops != NULL)
4041                 return bops;
4042
4043         return ERR_PTR(-EOPNOTSUPP);
4044 }
4045
4046 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4047         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
4048                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
4049         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
4050                                             .len = NFT_SET_MAXNAMELEN - 1 },
4051         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
4052         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
4053         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
4054         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
4055         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
4056         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
4057         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
4058         [NFTA_SET_ID]                   = { .type = NLA_U32 },
4059         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
4060         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
4061         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
4062                                             .len  = NFT_USERDATA_MAXLEN },
4063         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
4064         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
4065         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
4066         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
4067 };
4068
4069 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4070         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
4071         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
4072 };
4073
4074 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4075                                       const struct nlattr *nla, u8 genmask)
4076 {
4077         struct nft_set *set;
4078
4079         if (nla == NULL)
4080                 return ERR_PTR(-EINVAL);
4081
4082         list_for_each_entry_rcu(set, &table->sets, list) {
4083                 if (!nla_strcmp(nla, set->name) &&
4084                     nft_active_genmask(set, genmask))
4085                         return set;
4086         }
4087         return ERR_PTR(-ENOENT);
4088 }
4089
4090 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4091                                                const struct nlattr *nla,
4092                                                u8 genmask)
4093 {
4094         struct nft_set *set;
4095
4096         list_for_each_entry(set, &table->sets, list) {
4097                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4098                     nft_active_genmask(set, genmask))
4099                         return set;
4100         }
4101         return ERR_PTR(-ENOENT);
4102 }
4103
4104 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4105                                            const struct nft_table *table,
4106                                            const struct nlattr *nla, u8 genmask)
4107 {
4108         struct nftables_pernet *nft_net = nft_pernet(net);
4109         u32 id = ntohl(nla_get_be32(nla));
4110         struct nft_trans *trans;
4111
4112         list_for_each_entry(trans, &nft_net->commit_list, list) {
4113                 if (trans->msg_type == NFT_MSG_NEWSET) {
4114                         struct nft_set *set = nft_trans_set(trans);
4115
4116                         if (id == nft_trans_set_id(trans) &&
4117                             set->table == table &&
4118                             nft_active_genmask(set, genmask))
4119                                 return set;
4120                 }
4121         }
4122         return ERR_PTR(-ENOENT);
4123 }
4124
4125 struct nft_set *nft_set_lookup_global(const struct net *net,
4126                                       const struct nft_table *table,
4127                                       const struct nlattr *nla_set_name,
4128                                       const struct nlattr *nla_set_id,
4129                                       u8 genmask)
4130 {
4131         struct nft_set *set;
4132
4133         set = nft_set_lookup(table, nla_set_name, genmask);
4134         if (IS_ERR(set)) {
4135                 if (!nla_set_id)
4136                         return set;
4137
4138                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4139         }
4140         return set;
4141 }
4142 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4143
4144 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4145                                     const char *name)
4146 {
4147         const struct nft_set *i;
4148         const char *p;
4149         unsigned long *inuse;
4150         unsigned int n = 0, min = 0;
4151
4152         p = strchr(name, '%');
4153         if (p != NULL) {
4154                 if (p[1] != 'd' || strchr(p + 2, '%'))
4155                         return -EINVAL;
4156
4157                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4158                 if (inuse == NULL)
4159                         return -ENOMEM;
4160 cont:
4161                 list_for_each_entry(i, &ctx->table->sets, list) {
4162                         int tmp;
4163
4164                         if (!nft_is_active_next(ctx->net, i))
4165                                 continue;
4166                         if (!sscanf(i->name, name, &tmp))
4167                                 continue;
4168                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4169                                 continue;
4170
4171                         set_bit(tmp - min, inuse);
4172                 }
4173
4174                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4175                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4176                         min += BITS_PER_BYTE * PAGE_SIZE;
4177                         memset(inuse, 0, PAGE_SIZE);
4178                         goto cont;
4179                 }
4180                 free_page((unsigned long)inuse);
4181         }
4182
4183         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4184         if (!set->name)
4185                 return -ENOMEM;
4186
4187         list_for_each_entry(i, &ctx->table->sets, list) {
4188                 if (!nft_is_active_next(ctx->net, i))
4189                         continue;
4190                 if (!strcmp(set->name, i->name)) {
4191                         kfree(set->name);
4192                         set->name = NULL;
4193                         return -ENFILE;
4194                 }
4195         }
4196         return 0;
4197 }
4198
4199 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4200 {
4201         u64 ms = be64_to_cpu(nla_get_be64(nla));
4202         u64 max = (u64)(~((u64)0));
4203
4204         max = div_u64(max, NSEC_PER_MSEC);
4205         if (ms >= max)
4206                 return -ERANGE;
4207
4208         ms *= NSEC_PER_MSEC;
4209         *result = nsecs_to_jiffies64(ms);
4210         return 0;
4211 }
4212
4213 __be64 nf_jiffies64_to_msecs(u64 input)
4214 {
4215         return cpu_to_be64(jiffies64_to_msecs(input));
4216 }
4217
4218 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4219                                      const struct nft_set *set)
4220 {
4221         struct nlattr *concat, *field;
4222         int i;
4223
4224         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4225         if (!concat)
4226                 return -ENOMEM;
4227
4228         for (i = 0; i < set->field_count; i++) {
4229                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4230                 if (!field)
4231                         return -ENOMEM;
4232
4233                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4234                                  htonl(set->field_len[i])))
4235                         return -ENOMEM;
4236
4237                 nla_nest_end(skb, field);
4238         }
4239
4240         nla_nest_end(skb, concat);
4241
4242         return 0;
4243 }
4244
4245 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4246                               const struct nft_set *set, u16 event, u16 flags)
4247 {
4248         u64 timeout = READ_ONCE(set->timeout);
4249         u32 gc_int = READ_ONCE(set->gc_int);
4250         u32 portid = ctx->portid;
4251         struct nlmsghdr *nlh;
4252         struct nlattr *nest;
4253         u32 seq = ctx->seq;
4254         int i;
4255
4256         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4257         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4258                            NFNETLINK_V0, nft_base_seq(ctx->net));
4259         if (!nlh)
4260                 goto nla_put_failure;
4261
4262         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4263                 goto nla_put_failure;
4264         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4265                 goto nla_put_failure;
4266         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4267                          NFTA_SET_PAD))
4268                 goto nla_put_failure;
4269
4270         if (event == NFT_MSG_DELSET) {
4271                 nlmsg_end(skb, nlh);
4272                 return 0;
4273         }
4274
4275         if (set->flags != 0)
4276                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4277                         goto nla_put_failure;
4278
4279         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4280                 goto nla_put_failure;
4281         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4282                 goto nla_put_failure;
4283         if (set->flags & NFT_SET_MAP) {
4284                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4285                         goto nla_put_failure;
4286                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4287                         goto nla_put_failure;
4288         }
4289         if (set->flags & NFT_SET_OBJECT &&
4290             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4291                 goto nla_put_failure;
4292
4293         if (timeout &&
4294             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4295                          nf_jiffies64_to_msecs(timeout),
4296                          NFTA_SET_PAD))
4297                 goto nla_put_failure;
4298         if (gc_int &&
4299             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4300                 goto nla_put_failure;
4301
4302         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4303                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4304                         goto nla_put_failure;
4305         }
4306
4307         if (set->udata &&
4308             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4309                 goto nla_put_failure;
4310
4311         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4312         if (!nest)
4313                 goto nla_put_failure;
4314         if (set->size &&
4315             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4316                 goto nla_put_failure;
4317
4318         if (set->field_count > 1 &&
4319             nf_tables_fill_set_concat(skb, set))
4320                 goto nla_put_failure;
4321
4322         nla_nest_end(skb, nest);
4323
4324         if (set->num_exprs == 1) {
4325                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4326                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4327                         goto nla_put_failure;
4328
4329                 nla_nest_end(skb, nest);
4330         } else if (set->num_exprs > 1) {
4331                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4332                 if (nest == NULL)
4333                         goto nla_put_failure;
4334
4335                 for (i = 0; i < set->num_exprs; i++) {
4336                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4337                                           set->exprs[i], false) < 0)
4338                                 goto nla_put_failure;
4339                 }
4340                 nla_nest_end(skb, nest);
4341         }
4342
4343         nlmsg_end(skb, nlh);
4344         return 0;
4345
4346 nla_put_failure:
4347         nlmsg_trim(skb, nlh);
4348         return -1;
4349 }
4350
4351 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4352                                  const struct nft_set *set, int event,
4353                                  gfp_t gfp_flags)
4354 {
4355         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4356         u32 portid = ctx->portid;
4357         struct sk_buff *skb;
4358         u16 flags = 0;
4359         int err;
4360
4361         if (!ctx->report &&
4362             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4363                 return;
4364
4365         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4366         if (skb == NULL)
4367                 goto err;
4368
4369         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4370                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4371
4372         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4373         if (err < 0) {
4374                 kfree_skb(skb);
4375                 goto err;
4376         }
4377
4378         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4379         return;
4380 err:
4381         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4382 }
4383
4384 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4385 {
4386         const struct nft_set *set;
4387         unsigned int idx, s_idx = cb->args[0];
4388         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4389         struct net *net = sock_net(skb->sk);
4390         struct nft_ctx *ctx = cb->data, ctx_set;
4391         struct nftables_pernet *nft_net;
4392
4393         if (cb->args[1])
4394                 return skb->len;
4395
4396         rcu_read_lock();
4397         nft_net = nft_pernet(net);
4398         cb->seq = READ_ONCE(nft_net->base_seq);
4399
4400         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4401                 if (ctx->family != NFPROTO_UNSPEC &&
4402                     ctx->family != table->family)
4403                         continue;
4404
4405                 if (ctx->table && ctx->table != table)
4406                         continue;
4407
4408                 if (cur_table) {
4409                         if (cur_table != table)
4410                                 continue;
4411
4412                         cur_table = NULL;
4413                 }
4414                 idx = 0;
4415                 list_for_each_entry_rcu(set, &table->sets, list) {
4416                         if (idx < s_idx)
4417                                 goto cont;
4418                         if (!nft_is_active(net, set))
4419                                 goto cont;
4420
4421                         ctx_set = *ctx;
4422                         ctx_set.table = table;
4423                         ctx_set.family = table->family;
4424
4425                         if (nf_tables_fill_set(skb, &ctx_set, set,
4426                                                NFT_MSG_NEWSET,
4427                                                NLM_F_MULTI) < 0) {
4428                                 cb->args[0] = idx;
4429                                 cb->args[2] = (unsigned long) table;
4430                                 goto done;
4431                         }
4432                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4433 cont:
4434                         idx++;
4435                 }
4436                 if (s_idx)
4437                         s_idx = 0;
4438         }
4439         cb->args[1] = 1;
4440 done:
4441         rcu_read_unlock();
4442         return skb->len;
4443 }
4444
4445 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4446 {
4447         struct nft_ctx *ctx_dump = NULL;
4448
4449         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4450         if (ctx_dump == NULL)
4451                 return -ENOMEM;
4452
4453         cb->data = ctx_dump;
4454         return 0;
4455 }
4456
4457 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4458 {
4459         kfree(cb->data);
4460         return 0;
4461 }
4462
4463 /* called with rcu_read_lock held */
4464 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4465                             const struct nlattr * const nla[])
4466 {
4467         struct netlink_ext_ack *extack = info->extack;
4468         u8 genmask = nft_genmask_cur(info->net);
4469         u8 family = info->nfmsg->nfgen_family;
4470         struct nft_table *table = NULL;
4471         struct net *net = info->net;
4472         const struct nft_set *set;
4473         struct sk_buff *skb2;
4474         struct nft_ctx ctx;
4475         int err;
4476
4477         if (nla[NFTA_SET_TABLE]) {
4478                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4479                                          genmask, 0);
4480                 if (IS_ERR(table)) {
4481                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4482                         return PTR_ERR(table);
4483                 }
4484         }
4485
4486         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4487
4488         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4489                 struct netlink_dump_control c = {
4490                         .start = nf_tables_dump_sets_start,
4491                         .dump = nf_tables_dump_sets,
4492                         .done = nf_tables_dump_sets_done,
4493                         .data = &ctx,
4494                         .module = THIS_MODULE,
4495                 };
4496
4497                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4498         }
4499
4500         /* Only accept unspec with dump */
4501         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4502                 return -EAFNOSUPPORT;
4503         if (!nla[NFTA_SET_TABLE])
4504                 return -EINVAL;
4505
4506         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4507         if (IS_ERR(set))
4508                 return PTR_ERR(set);
4509
4510         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4511         if (skb2 == NULL)
4512                 return -ENOMEM;
4513
4514         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4515         if (err < 0)
4516                 goto err_fill_set_info;
4517
4518         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4519
4520 err_fill_set_info:
4521         kfree_skb(skb2);
4522         return err;
4523 }
4524
4525 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4526         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4527 };
4528
4529 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4530                                      struct nft_set_desc *desc)
4531 {
4532         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4533         u32 len;
4534         int err;
4535
4536         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4537                 return -E2BIG;
4538
4539         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4540                                           nft_concat_policy, NULL);
4541         if (err < 0)
4542                 return err;
4543
4544         if (!tb[NFTA_SET_FIELD_LEN])
4545                 return -EINVAL;
4546
4547         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4548         if (!len || len > U8_MAX)
4549                 return -EINVAL;
4550
4551         desc->field_len[desc->field_count++] = len;
4552
4553         return 0;
4554 }
4555
4556 static int nft_set_desc_concat(struct nft_set_desc *desc,
4557                                const struct nlattr *nla)
4558 {
4559         struct nlattr *attr;
4560         u32 num_regs = 0;
4561         int rem, err, i;
4562
4563         nla_for_each_nested(attr, nla, rem) {
4564                 if (nla_type(attr) != NFTA_LIST_ELEM)
4565                         return -EINVAL;
4566
4567                 err = nft_set_desc_concat_parse(attr, desc);
4568                 if (err < 0)
4569                         return err;
4570         }
4571
4572         for (i = 0; i < desc->field_count; i++)
4573                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4574
4575         if (num_regs > NFT_REG32_COUNT)
4576                 return -E2BIG;
4577
4578         return 0;
4579 }
4580
4581 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4582                                     const struct nlattr *nla)
4583 {
4584         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4585         int err;
4586
4587         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4588                                           nft_set_desc_policy, NULL);
4589         if (err < 0)
4590                 return err;
4591
4592         if (da[NFTA_SET_DESC_SIZE] != NULL)
4593                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4594         if (da[NFTA_SET_DESC_CONCAT])
4595                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4596
4597         return err;
4598 }
4599
4600 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4601                               const struct nlattr * const *nla,
4602                               struct nft_expr **exprs, int *num_exprs,
4603                               u32 flags)
4604 {
4605         struct nft_expr *expr;
4606         int err, i;
4607
4608         if (nla[NFTA_SET_EXPR]) {
4609                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4610                 if (IS_ERR(expr)) {
4611                         err = PTR_ERR(expr);
4612                         goto err_set_expr_alloc;
4613                 }
4614                 exprs[0] = expr;
4615                 (*num_exprs)++;
4616         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4617                 struct nlattr *tmp;
4618                 int left;
4619
4620                 if (!(flags & NFT_SET_EXPR)) {
4621                         err = -EINVAL;
4622                         goto err_set_expr_alloc;
4623                 }
4624                 i = 0;
4625                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4626                         if (i == NFT_SET_EXPR_MAX) {
4627                                 err = -E2BIG;
4628                                 goto err_set_expr_alloc;
4629                         }
4630                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4631                                 err = -EINVAL;
4632                                 goto err_set_expr_alloc;
4633                         }
4634                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4635                         if (IS_ERR(expr)) {
4636                                 err = PTR_ERR(expr);
4637                                 goto err_set_expr_alloc;
4638                         }
4639                         exprs[i++] = expr;
4640                         (*num_exprs)++;
4641                 }
4642         }
4643
4644         return 0;
4645
4646 err_set_expr_alloc:
4647         for (i = 0; i < *num_exprs; i++)
4648                 nft_expr_destroy(ctx, exprs[i]);
4649
4650         return err;
4651 }
4652
4653 static bool nft_set_is_same(const struct nft_set *set,
4654                             const struct nft_set_desc *desc,
4655                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4656 {
4657         int i;
4658
4659         if (set->ktype != desc->ktype ||
4660             set->dtype != desc->dtype ||
4661             set->flags != flags ||
4662             set->klen != desc->klen ||
4663             set->dlen != desc->dlen ||
4664             set->field_count != desc->field_count ||
4665             set->num_exprs != num_exprs)
4666                 return false;
4667
4668         for (i = 0; i < desc->field_count; i++) {
4669                 if (set->field_len[i] != desc->field_len[i])
4670                         return false;
4671         }
4672
4673         for (i = 0; i < num_exprs; i++) {
4674                 if (set->exprs[i]->ops != exprs[i]->ops)
4675                         return false;
4676         }
4677
4678         return true;
4679 }
4680
4681 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4682                             const struct nlattr * const nla[])
4683 {
4684         struct netlink_ext_ack *extack = info->extack;
4685         u8 genmask = nft_genmask_next(info->net);
4686         u8 family = info->nfmsg->nfgen_family;
4687         const struct nft_set_ops *ops;
4688         struct net *net = info->net;
4689         struct nft_set_desc desc;
4690         struct nft_table *table;
4691         unsigned char *udata;
4692         struct nft_set *set;
4693         struct nft_ctx ctx;
4694         size_t alloc_size;
4695         int num_exprs = 0;
4696         char *name;
4697         int err, i;
4698         u16 udlen;
4699         u32 flags;
4700         u64 size;
4701
4702         if (nla[NFTA_SET_TABLE] == NULL ||
4703             nla[NFTA_SET_NAME] == NULL ||
4704             nla[NFTA_SET_KEY_LEN] == NULL ||
4705             nla[NFTA_SET_ID] == NULL)
4706                 return -EINVAL;
4707
4708         memset(&desc, 0, sizeof(desc));
4709
4710         desc.ktype = NFT_DATA_VALUE;
4711         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4712                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4713                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4714                         return -EINVAL;
4715         }
4716
4717         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4718         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4719                 return -EINVAL;
4720
4721         flags = 0;
4722         if (nla[NFTA_SET_FLAGS] != NULL) {
4723                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4724                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4725                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4726                               NFT_SET_MAP | NFT_SET_EVAL |
4727                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4728                         return -EOPNOTSUPP;
4729                 /* Only one of these operations is supported */
4730                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4731                              (NFT_SET_MAP | NFT_SET_OBJECT))
4732                         return -EOPNOTSUPP;
4733                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4734                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4735                         return -EOPNOTSUPP;
4736         }
4737
4738         desc.dtype = 0;
4739         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4740                 if (!(flags & NFT_SET_MAP))
4741                         return -EINVAL;
4742
4743                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4744                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4745                     desc.dtype != NFT_DATA_VERDICT)
4746                         return -EINVAL;
4747
4748                 if (desc.dtype != NFT_DATA_VERDICT) {
4749                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4750                                 return -EINVAL;
4751                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4752                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4753                                 return -EINVAL;
4754                 } else
4755                         desc.dlen = sizeof(struct nft_verdict);
4756         } else if (flags & NFT_SET_MAP)
4757                 return -EINVAL;
4758
4759         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4760                 if (!(flags & NFT_SET_OBJECT))
4761                         return -EINVAL;
4762
4763                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4764                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4765                     desc.objtype > NFT_OBJECT_MAX)
4766                         return -EOPNOTSUPP;
4767         } else if (flags & NFT_SET_OBJECT)
4768                 return -EINVAL;
4769         else
4770                 desc.objtype = NFT_OBJECT_UNSPEC;
4771
4772         desc.timeout = 0;
4773         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4774                 if (!(flags & NFT_SET_TIMEOUT))
4775                         return -EINVAL;
4776
4777                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4778                 if (err)
4779                         return err;
4780         }
4781         desc.gc_int = 0;
4782         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4783                 if (!(flags & NFT_SET_TIMEOUT))
4784                         return -EINVAL;
4785                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4786         }
4787
4788         desc.policy = NFT_SET_POL_PERFORMANCE;
4789         if (nla[NFTA_SET_POLICY] != NULL)
4790                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4791
4792         if (nla[NFTA_SET_DESC] != NULL) {
4793                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4794                 if (err < 0)
4795                         return err;
4796
4797                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4798                         return -EINVAL;
4799         } else if (flags & NFT_SET_CONCAT) {
4800                 return -EINVAL;
4801         }
4802
4803         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4804                 desc.expr = true;
4805
4806         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4807                                  NETLINK_CB(skb).portid);
4808         if (IS_ERR(table)) {
4809                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4810                 return PTR_ERR(table);
4811         }
4812
4813         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4814
4815         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4816         if (IS_ERR(set)) {
4817                 if (PTR_ERR(set) != -ENOENT) {
4818                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4819                         return PTR_ERR(set);
4820                 }
4821         } else {
4822                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4823
4824                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4825                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4826                         return -EEXIST;
4827                 }
4828                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4829                         return -EOPNOTSUPP;
4830
4831                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4832                 if (err < 0)
4833                         return err;
4834
4835                 err = 0;
4836                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4837                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4838                         err = -EEXIST;
4839                 }
4840
4841                 for (i = 0; i < num_exprs; i++)
4842                         nft_expr_destroy(&ctx, exprs[i]);
4843
4844                 if (err < 0)
4845                         return err;
4846
4847                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4848         }
4849
4850         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4851                 return -ENOENT;
4852
4853         ops = nft_select_set_ops(&ctx, nla, &desc);
4854         if (IS_ERR(ops))
4855                 return PTR_ERR(ops);
4856
4857         udlen = 0;
4858         if (nla[NFTA_SET_USERDATA])
4859                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4860
4861         size = 0;
4862         if (ops->privsize != NULL)
4863                 size = ops->privsize(nla, &desc);
4864         alloc_size = sizeof(*set) + size + udlen;
4865         if (alloc_size < size || alloc_size > INT_MAX)
4866                 return -ENOMEM;
4867         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4868         if (!set)
4869                 return -ENOMEM;
4870
4871         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4872         if (!name) {
4873                 err = -ENOMEM;
4874                 goto err_set_name;
4875         }
4876
4877         err = nf_tables_set_alloc_name(&ctx, set, name);
4878         kfree(name);
4879         if (err < 0)
4880                 goto err_set_name;
4881
4882         udata = NULL;
4883         if (udlen) {
4884                 udata = set->data + size;
4885                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4886         }
4887
4888         INIT_LIST_HEAD(&set->bindings);
4889         INIT_LIST_HEAD(&set->catchall_list);
4890         set->table = table;
4891         write_pnet(&set->net, net);
4892         set->ops = ops;
4893         set->ktype = desc.ktype;
4894         set->klen = desc.klen;
4895         set->dtype = desc.dtype;
4896         set->objtype = desc.objtype;
4897         set->dlen = desc.dlen;
4898         set->flags = flags;
4899         set->size = desc.size;
4900         set->policy = desc.policy;
4901         set->udlen = udlen;
4902         set->udata = udata;
4903         set->timeout = desc.timeout;
4904         set->gc_int = desc.gc_int;
4905
4906         set->field_count = desc.field_count;
4907         for (i = 0; i < desc.field_count; i++)
4908                 set->field_len[i] = desc.field_len[i];
4909
4910         err = ops->init(set, &desc, nla);
4911         if (err < 0)
4912                 goto err_set_init;
4913
4914         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4915         if (err < 0)
4916                 goto err_set_destroy;
4917
4918         set->num_exprs = num_exprs;
4919         set->handle = nf_tables_alloc_handle(table);
4920
4921         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4922         if (err < 0)
4923                 goto err_set_expr_alloc;
4924
4925         list_add_tail_rcu(&set->list, &table->sets);
4926         table->use++;
4927         return 0;
4928
4929 err_set_expr_alloc:
4930         for (i = 0; i < set->num_exprs; i++)
4931                 nft_expr_destroy(&ctx, set->exprs[i]);
4932 err_set_destroy:
4933         ops->destroy(set);
4934 err_set_init:
4935         kfree(set->name);
4936 err_set_name:
4937         kvfree(set);
4938         return err;
4939 }
4940
4941 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4942                                      struct nft_set *set)
4943 {
4944         struct nft_set_elem_catchall *next, *catchall;
4945
4946         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4947                 list_del_rcu(&catchall->list);
4948                 nft_set_elem_destroy(set, catchall->elem, true);
4949                 kfree_rcu(catchall, rcu);
4950         }
4951 }
4952
4953 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4954 {
4955         int i;
4956
4957         if (WARN_ON(set->use > 0))
4958                 return;
4959
4960         for (i = 0; i < set->num_exprs; i++)
4961                 nft_expr_destroy(ctx, set->exprs[i]);
4962
4963         set->ops->destroy(set);
4964         nft_set_catchall_destroy(ctx, set);
4965         kfree(set->name);
4966         kvfree(set);
4967 }
4968
4969 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4970                             const struct nlattr * const nla[])
4971 {
4972         struct netlink_ext_ack *extack = info->extack;
4973         u8 genmask = nft_genmask_next(info->net);
4974         u8 family = info->nfmsg->nfgen_family;
4975         struct net *net = info->net;
4976         const struct nlattr *attr;
4977         struct nft_table *table;
4978         struct nft_set *set;
4979         struct nft_ctx ctx;
4980
4981         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4982                 return -EAFNOSUPPORT;
4983
4984         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4985                                  genmask, NETLINK_CB(skb).portid);
4986         if (IS_ERR(table)) {
4987                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4988                 return PTR_ERR(table);
4989         }
4990
4991         if (nla[NFTA_SET_HANDLE]) {
4992                 attr = nla[NFTA_SET_HANDLE];
4993                 set = nft_set_lookup_byhandle(table, attr, genmask);
4994         } else {
4995                 attr = nla[NFTA_SET_NAME];
4996                 set = nft_set_lookup(table, attr, genmask);
4997         }
4998
4999         if (IS_ERR(set)) {
5000                 if (PTR_ERR(set) == -ENOENT &&
5001                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5002                         return 0;
5003
5004                 NL_SET_BAD_ATTR(extack, attr);
5005                 return PTR_ERR(set);
5006         }
5007         if (set->use ||
5008             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5009              atomic_read(&set->nelems) > 0)) {
5010                 NL_SET_BAD_ATTR(extack, attr);
5011                 return -EBUSY;
5012         }
5013
5014         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5015
5016         return nft_delset(&ctx, set);
5017 }
5018
5019 static int nft_validate_register_store(const struct nft_ctx *ctx,
5020                                        enum nft_registers reg,
5021                                        const struct nft_data *data,
5022                                        enum nft_data_types type,
5023                                        unsigned int len);
5024
5025 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5026                                      struct nft_set *set,
5027                                      struct nft_set_elem *elem)
5028 {
5029         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5030         enum nft_registers dreg;
5031
5032         dreg = nft_type_to_reg(set->dtype);
5033         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5034                                            set->dtype == NFT_DATA_VERDICT ?
5035                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
5036                                            set->dlen);
5037 }
5038
5039 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5040                                         struct nft_set *set,
5041                                         const struct nft_set_iter *iter,
5042                                         struct nft_set_elem *elem)
5043 {
5044         return nft_setelem_data_validate(ctx, set, elem);
5045 }
5046
5047 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5048                                        struct nft_set *set)
5049 {
5050         u8 genmask = nft_genmask_next(ctx->net);
5051         struct nft_set_elem_catchall *catchall;
5052         struct nft_set_elem elem;
5053         struct nft_set_ext *ext;
5054         int ret = 0;
5055
5056         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5057                 ext = nft_set_elem_ext(set, catchall->elem);
5058                 if (!nft_set_elem_active(ext, genmask))
5059                         continue;
5060
5061                 elem.priv = catchall->elem;
5062                 ret = nft_setelem_data_validate(ctx, set, &elem);
5063                 if (ret < 0)
5064                         break;
5065         }
5066
5067         return ret;
5068 }
5069
5070 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5071                        struct nft_set_binding *binding)
5072 {
5073         struct nft_set_binding *i;
5074         struct nft_set_iter iter;
5075
5076         if (set->use == UINT_MAX)
5077                 return -EOVERFLOW;
5078
5079         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5080                 return -EBUSY;
5081
5082         if (binding->flags & NFT_SET_MAP) {
5083                 /* If the set is already bound to the same chain all
5084                  * jumps are already validated for that chain.
5085                  */
5086                 list_for_each_entry(i, &set->bindings, list) {
5087                         if (i->flags & NFT_SET_MAP &&
5088                             i->chain == binding->chain)
5089                                 goto bind;
5090                 }
5091
5092                 iter.genmask    = nft_genmask_next(ctx->net);
5093                 iter.skip       = 0;
5094                 iter.count      = 0;
5095                 iter.err        = 0;
5096                 iter.fn         = nf_tables_bind_check_setelem;
5097
5098                 set->ops->walk(ctx, set, &iter);
5099                 if (!iter.err)
5100                         iter.err = nft_set_catchall_bind_check(ctx, set);
5101
5102                 if (iter.err < 0)
5103                         return iter.err;
5104         }
5105 bind:
5106         binding->chain = ctx->chain;
5107         list_add_tail_rcu(&binding->list, &set->bindings);
5108         nft_set_trans_bind(ctx, set);
5109         set->use++;
5110
5111         return 0;
5112 }
5113 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5114
5115 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5116                                  struct nft_set_binding *binding, bool event)
5117 {
5118         list_del_rcu(&binding->list);
5119
5120         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5121                 list_del_rcu(&set->list);
5122                 if (event)
5123                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5124                                              GFP_KERNEL);
5125         }
5126 }
5127
5128 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5129 {
5130         if (nft_set_is_anonymous(set))
5131                 nft_clear(ctx->net, set);
5132
5133         set->use++;
5134 }
5135 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5136
5137 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5138                               struct nft_set_binding *binding,
5139                               enum nft_trans_phase phase)
5140 {
5141         switch (phase) {
5142         case NFT_TRANS_PREPARE:
5143                 if (nft_set_is_anonymous(set))
5144                         nft_deactivate_next(ctx->net, set);
5145
5146                 set->use--;
5147                 return;
5148         case NFT_TRANS_ABORT:
5149         case NFT_TRANS_RELEASE:
5150                 set->use--;
5151                 fallthrough;
5152         default:
5153                 nf_tables_unbind_set(ctx, set, binding,
5154                                      phase == NFT_TRANS_COMMIT);
5155         }
5156 }
5157 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5158
5159 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5160 {
5161         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5162                 nft_set_destroy(ctx, set);
5163 }
5164 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5165
5166 const struct nft_set_ext_type nft_set_ext_types[] = {
5167         [NFT_SET_EXT_KEY]               = {
5168                 .align  = __alignof__(u32),
5169         },
5170         [NFT_SET_EXT_DATA]              = {
5171                 .align  = __alignof__(u32),
5172         },
5173         [NFT_SET_EXT_EXPRESSIONS]       = {
5174                 .align  = __alignof__(struct nft_set_elem_expr),
5175         },
5176         [NFT_SET_EXT_OBJREF]            = {
5177                 .len    = sizeof(struct nft_object *),
5178                 .align  = __alignof__(struct nft_object *),
5179         },
5180         [NFT_SET_EXT_FLAGS]             = {
5181                 .len    = sizeof(u8),
5182                 .align  = __alignof__(u8),
5183         },
5184         [NFT_SET_EXT_TIMEOUT]           = {
5185                 .len    = sizeof(u64),
5186                 .align  = __alignof__(u64),
5187         },
5188         [NFT_SET_EXT_EXPIRATION]        = {
5189                 .len    = sizeof(u64),
5190                 .align  = __alignof__(u64),
5191         },
5192         [NFT_SET_EXT_USERDATA]          = {
5193                 .len    = sizeof(struct nft_userdata),
5194                 .align  = __alignof__(struct nft_userdata),
5195         },
5196         [NFT_SET_EXT_KEY_END]           = {
5197                 .align  = __alignof__(u32),
5198         },
5199 };
5200
5201 /*
5202  * Set elements
5203  */
5204
5205 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5206         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5207         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5208         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5209         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5210         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5211         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5212                                             .len = NFT_USERDATA_MAXLEN },
5213         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5214         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5215                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5216         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5217         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5218 };
5219
5220 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5221         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5222                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5223         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5224                                             .len = NFT_SET_MAXNAMELEN - 1 },
5225         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5226         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5227 };
5228
5229 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5230                                   const struct nft_set *set,
5231                                   const struct nft_set_ext *ext)
5232 {
5233         struct nft_set_elem_expr *elem_expr;
5234         u32 size, num_exprs = 0;
5235         struct nft_expr *expr;
5236         struct nlattr *nest;
5237
5238         elem_expr = nft_set_ext_expr(ext);
5239         nft_setelem_expr_foreach(expr, elem_expr, size)
5240                 num_exprs++;
5241
5242         if (num_exprs == 1) {
5243                 expr = nft_setelem_expr_at(elem_expr, 0);
5244                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
5245                         return -1;
5246
5247                 return 0;
5248         } else if (num_exprs > 1) {
5249                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5250                 if (nest == NULL)
5251                         goto nla_put_failure;
5252
5253                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5254                         expr = nft_setelem_expr_at(elem_expr, size);
5255                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5256                                 goto nla_put_failure;
5257                 }
5258                 nla_nest_end(skb, nest);
5259         }
5260         return 0;
5261
5262 nla_put_failure:
5263         return -1;
5264 }
5265
5266 static int nf_tables_fill_setelem(struct sk_buff *skb,
5267                                   const struct nft_set *set,
5268                                   const struct nft_set_elem *elem)
5269 {
5270         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5271         unsigned char *b = skb_tail_pointer(skb);
5272         struct nlattr *nest;
5273
5274         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5275         if (nest == NULL)
5276                 goto nla_put_failure;
5277
5278         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5279             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5280                           NFT_DATA_VALUE, set->klen) < 0)
5281                 goto nla_put_failure;
5282
5283         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5284             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5285                           NFT_DATA_VALUE, set->klen) < 0)
5286                 goto nla_put_failure;
5287
5288         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5289             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5290                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5291                           set->dlen) < 0)
5292                 goto nla_put_failure;
5293
5294         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5295             nft_set_elem_expr_dump(skb, set, ext))
5296                 goto nla_put_failure;
5297
5298         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5299             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5300                            (*nft_set_ext_obj(ext))->key.name) < 0)
5301                 goto nla_put_failure;
5302
5303         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5304             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5305                          htonl(*nft_set_ext_flags(ext))))
5306                 goto nla_put_failure;
5307
5308         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5309             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5310                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5311                          NFTA_SET_ELEM_PAD))
5312                 goto nla_put_failure;
5313
5314         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5315                 u64 expires, now = get_jiffies_64();
5316
5317                 expires = *nft_set_ext_expiration(ext);
5318                 if (time_before64(now, expires))
5319                         expires -= now;
5320                 else
5321                         expires = 0;
5322
5323                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5324                                  nf_jiffies64_to_msecs(expires),
5325                                  NFTA_SET_ELEM_PAD))
5326                         goto nla_put_failure;
5327         }
5328
5329         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5330                 struct nft_userdata *udata;
5331
5332                 udata = nft_set_ext_userdata(ext);
5333                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5334                             udata->len + 1, udata->data))
5335                         goto nla_put_failure;
5336         }
5337
5338         nla_nest_end(skb, nest);
5339         return 0;
5340
5341 nla_put_failure:
5342         nlmsg_trim(skb, b);
5343         return -EMSGSIZE;
5344 }
5345
5346 struct nft_set_dump_args {
5347         const struct netlink_callback   *cb;
5348         struct nft_set_iter             iter;
5349         struct sk_buff                  *skb;
5350 };
5351
5352 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5353                                   struct nft_set *set,
5354                                   const struct nft_set_iter *iter,
5355                                   struct nft_set_elem *elem)
5356 {
5357         struct nft_set_dump_args *args;
5358
5359         args = container_of(iter, struct nft_set_dump_args, iter);
5360         return nf_tables_fill_setelem(args->skb, set, elem);
5361 }
5362
5363 struct nft_set_dump_ctx {
5364         const struct nft_set    *set;
5365         struct nft_ctx          ctx;
5366 };
5367
5368 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5369                                  const struct nft_set *set)
5370 {
5371         struct nft_set_elem_catchall *catchall;
5372         u8 genmask = nft_genmask_cur(net);
5373         struct nft_set_elem elem;
5374         struct nft_set_ext *ext;
5375         int ret = 0;
5376
5377         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5378                 ext = nft_set_elem_ext(set, catchall->elem);
5379                 if (!nft_set_elem_active(ext, genmask) ||
5380                     nft_set_elem_expired(ext))
5381                         continue;
5382
5383                 elem.priv = catchall->elem;
5384                 ret = nf_tables_fill_setelem(skb, set, &elem);
5385                 break;
5386         }
5387
5388         return ret;
5389 }
5390
5391 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5392 {
5393         struct nft_set_dump_ctx *dump_ctx = cb->data;
5394         struct net *net = sock_net(skb->sk);
5395         struct nftables_pernet *nft_net;
5396         struct nft_table *table;
5397         struct nft_set *set;
5398         struct nft_set_dump_args args;
5399         bool set_found = false;
5400         struct nlmsghdr *nlh;
5401         struct nlattr *nest;
5402         u32 portid, seq;
5403         int event;
5404
5405         rcu_read_lock();
5406         nft_net = nft_pernet(net);
5407         cb->seq = READ_ONCE(nft_net->base_seq);
5408
5409         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5410                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5411                     dump_ctx->ctx.family != table->family)
5412                         continue;
5413
5414                 if (table != dump_ctx->ctx.table)
5415                         continue;
5416
5417                 list_for_each_entry_rcu(set, &table->sets, list) {
5418                         if (set == dump_ctx->set) {
5419                                 set_found = true;
5420                                 break;
5421                         }
5422                 }
5423                 break;
5424         }
5425
5426         if (!set_found) {
5427                 rcu_read_unlock();
5428                 return -ENOENT;
5429         }
5430
5431         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5432         portid = NETLINK_CB(cb->skb).portid;
5433         seq    = cb->nlh->nlmsg_seq;
5434
5435         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5436                            table->family, NFNETLINK_V0, nft_base_seq(net));
5437         if (!nlh)
5438                 goto nla_put_failure;
5439
5440         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5441                 goto nla_put_failure;
5442         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5443                 goto nla_put_failure;
5444
5445         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5446         if (nest == NULL)
5447                 goto nla_put_failure;
5448
5449         args.cb                 = cb;
5450         args.skb                = skb;
5451         args.iter.genmask       = nft_genmask_cur(net);
5452         args.iter.skip          = cb->args[0];
5453         args.iter.count         = 0;
5454         args.iter.err           = 0;
5455         args.iter.fn            = nf_tables_dump_setelem;
5456         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5457
5458         if (!args.iter.err && args.iter.count == cb->args[0])
5459                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5460         rcu_read_unlock();
5461
5462         nla_nest_end(skb, nest);
5463         nlmsg_end(skb, nlh);
5464
5465         if (args.iter.err && args.iter.err != -EMSGSIZE)
5466                 return args.iter.err;
5467         if (args.iter.count == cb->args[0])
5468                 return 0;
5469
5470         cb->args[0] = args.iter.count;
5471         return skb->len;
5472
5473 nla_put_failure:
5474         rcu_read_unlock();
5475         return -ENOSPC;
5476 }
5477
5478 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5479 {
5480         struct nft_set_dump_ctx *dump_ctx = cb->data;
5481
5482         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5483
5484         return cb->data ? 0 : -ENOMEM;
5485 }
5486
5487 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5488 {
5489         kfree(cb->data);
5490         return 0;
5491 }
5492
5493 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5494                                        const struct nft_ctx *ctx, u32 seq,
5495                                        u32 portid, int event, u16 flags,
5496                                        const struct nft_set *set,
5497                                        const struct nft_set_elem *elem)
5498 {
5499         struct nlmsghdr *nlh;
5500         struct nlattr *nest;
5501         int err;
5502
5503         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5504         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5505                            NFNETLINK_V0, nft_base_seq(ctx->net));
5506         if (!nlh)
5507                 goto nla_put_failure;
5508
5509         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5510                 goto nla_put_failure;
5511         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5512                 goto nla_put_failure;
5513
5514         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5515         if (nest == NULL)
5516                 goto nla_put_failure;
5517
5518         err = nf_tables_fill_setelem(skb, set, elem);
5519         if (err < 0)
5520                 goto nla_put_failure;
5521
5522         nla_nest_end(skb, nest);
5523
5524         nlmsg_end(skb, nlh);
5525         return 0;
5526
5527 nla_put_failure:
5528         nlmsg_trim(skb, nlh);
5529         return -1;
5530 }
5531
5532 static int nft_setelem_parse_flags(const struct nft_set *set,
5533                                    const struct nlattr *attr, u32 *flags)
5534 {
5535         if (attr == NULL)
5536                 return 0;
5537
5538         *flags = ntohl(nla_get_be32(attr));
5539         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5540                 return -EOPNOTSUPP;
5541         if (!(set->flags & NFT_SET_INTERVAL) &&
5542             *flags & NFT_SET_ELEM_INTERVAL_END)
5543                 return -EINVAL;
5544         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5545             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5546                 return -EINVAL;
5547
5548         return 0;
5549 }
5550
5551 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5552                                  struct nft_data *key, struct nlattr *attr)
5553 {
5554         struct nft_data_desc desc = {
5555                 .type   = NFT_DATA_VALUE,
5556                 .size   = NFT_DATA_VALUE_MAXLEN,
5557                 .len    = set->klen,
5558         };
5559
5560         return nft_data_init(ctx, key, &desc, attr);
5561 }
5562
5563 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5564                                   struct nft_data_desc *desc,
5565                                   struct nft_data *data,
5566                                   struct nlattr *attr)
5567 {
5568         u32 dtype;
5569
5570         if (set->dtype == NFT_DATA_VERDICT)
5571                 dtype = NFT_DATA_VERDICT;
5572         else
5573                 dtype = NFT_DATA_VALUE;
5574
5575         desc->type = dtype;
5576         desc->size = NFT_DATA_VALUE_MAXLEN;
5577         desc->len = set->dlen;
5578         desc->flags = NFT_DATA_DESC_SETELEM;
5579
5580         return nft_data_init(ctx, data, desc, attr);
5581 }
5582
5583 static void *nft_setelem_catchall_get(const struct net *net,
5584                                       const struct nft_set *set)
5585 {
5586         struct nft_set_elem_catchall *catchall;
5587         u8 genmask = nft_genmask_cur(net);
5588         struct nft_set_ext *ext;
5589         void *priv = NULL;
5590
5591         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5592                 ext = nft_set_elem_ext(set, catchall->elem);
5593                 if (!nft_set_elem_active(ext, genmask) ||
5594                     nft_set_elem_expired(ext))
5595                         continue;
5596
5597                 priv = catchall->elem;
5598                 break;
5599         }
5600
5601         return priv;
5602 }
5603
5604 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5605                            struct nft_set_elem *elem, u32 flags)
5606 {
5607         void *priv;
5608
5609         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5610                 priv = set->ops->get(ctx->net, set, elem, flags);
5611                 if (IS_ERR(priv))
5612                         return PTR_ERR(priv);
5613         } else {
5614                 priv = nft_setelem_catchall_get(ctx->net, set);
5615                 if (!priv)
5616                         return -ENOENT;
5617         }
5618         elem->priv = priv;
5619
5620         return 0;
5621 }
5622
5623 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5624                             const struct nlattr *attr)
5625 {
5626         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5627         struct nft_set_elem elem;
5628         struct sk_buff *skb;
5629         uint32_t flags = 0;
5630         int err;
5631
5632         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5633                                           nft_set_elem_policy, NULL);
5634         if (err < 0)
5635                 return err;
5636
5637         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5638         if (err < 0)
5639                 return err;
5640
5641         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5642                 return -EINVAL;
5643
5644         if (nla[NFTA_SET_ELEM_KEY]) {
5645                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5646                                             nla[NFTA_SET_ELEM_KEY]);
5647                 if (err < 0)
5648                         return err;
5649         }
5650
5651         if (nla[NFTA_SET_ELEM_KEY_END]) {
5652                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5653                                             nla[NFTA_SET_ELEM_KEY_END]);
5654                 if (err < 0)
5655                         return err;
5656         }
5657
5658         err = nft_setelem_get(ctx, set, &elem, flags);
5659         if (err < 0)
5660                 return err;
5661
5662         err = -ENOMEM;
5663         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5664         if (skb == NULL)
5665                 return err;
5666
5667         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5668                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5669         if (err < 0)
5670                 goto err_fill_setelem;
5671
5672         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5673
5674 err_fill_setelem:
5675         kfree_skb(skb);
5676         return err;
5677 }
5678
5679 /* called with rcu_read_lock held */
5680 static int nf_tables_getsetelem(struct sk_buff *skb,
5681                                 const struct nfnl_info *info,
5682                                 const struct nlattr * const nla[])
5683 {
5684         struct netlink_ext_ack *extack = info->extack;
5685         u8 genmask = nft_genmask_cur(info->net);
5686         u8 family = info->nfmsg->nfgen_family;
5687         struct net *net = info->net;
5688         struct nft_table *table;
5689         struct nft_set *set;
5690         struct nlattr *attr;
5691         struct nft_ctx ctx;
5692         int rem, err = 0;
5693
5694         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5695                                  genmask, 0);
5696         if (IS_ERR(table)) {
5697                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5698                 return PTR_ERR(table);
5699         }
5700
5701         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5702         if (IS_ERR(set))
5703                 return PTR_ERR(set);
5704
5705         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5706
5707         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5708                 struct netlink_dump_control c = {
5709                         .start = nf_tables_dump_set_start,
5710                         .dump = nf_tables_dump_set,
5711                         .done = nf_tables_dump_set_done,
5712                         .module = THIS_MODULE,
5713                 };
5714                 struct nft_set_dump_ctx dump_ctx = {
5715                         .set = set,
5716                         .ctx = ctx,
5717                 };
5718
5719                 c.data = &dump_ctx;
5720                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5721         }
5722
5723         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5724                 return -EINVAL;
5725
5726         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5727                 err = nft_get_set_elem(&ctx, set, attr);
5728                 if (err < 0) {
5729                         NL_SET_BAD_ATTR(extack, attr);
5730                         break;
5731                 }
5732         }
5733
5734         return err;
5735 }
5736
5737 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5738                                      const struct nft_set *set,
5739                                      const struct nft_set_elem *elem,
5740                                      int event)
5741 {
5742         struct nftables_pernet *nft_net;
5743         struct net *net = ctx->net;
5744         u32 portid = ctx->portid;
5745         struct sk_buff *skb;
5746         u16 flags = 0;
5747         int err;
5748
5749         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5750                 return;
5751
5752         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5753         if (skb == NULL)
5754                 goto err;
5755
5756         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5757                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5758
5759         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5760                                           set, elem);
5761         if (err < 0) {
5762                 kfree_skb(skb);
5763                 goto err;
5764         }
5765
5766         nft_net = nft_pernet(net);
5767         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5768         return;
5769 err:
5770         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5771 }
5772
5773 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5774                                               int msg_type,
5775                                               struct nft_set *set)
5776 {
5777         struct nft_trans *trans;
5778
5779         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5780         if (trans == NULL)
5781                 return NULL;
5782
5783         nft_trans_elem_set(trans) = set;
5784         return trans;
5785 }
5786
5787 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5788                                          const struct nft_set *set,
5789                                          const struct nlattr *attr)
5790 {
5791         struct nft_expr *expr;
5792         int err;
5793
5794         expr = nft_expr_init(ctx, attr);
5795         if (IS_ERR(expr))
5796                 return expr;
5797
5798         err = -EOPNOTSUPP;
5799         if (expr->ops->type->flags & NFT_EXPR_GC) {
5800                 if (set->flags & NFT_SET_TIMEOUT)
5801                         goto err_set_elem_expr;
5802                 if (!set->ops->gc_init)
5803                         goto err_set_elem_expr;
5804                 set->ops->gc_init(set);
5805         }
5806
5807         return expr;
5808
5809 err_set_elem_expr:
5810         nft_expr_destroy(ctx, expr);
5811         return ERR_PTR(err);
5812 }
5813
5814 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5815 {
5816         len += nft_set_ext_types[id].len;
5817         if (len > tmpl->ext_len[id] ||
5818             len > U8_MAX)
5819                 return -1;
5820
5821         return 0;
5822 }
5823
5824 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5825                               void *to, const void *from, u32 len)
5826 {
5827         if (nft_set_ext_check(tmpl, id, len) < 0)
5828                 return -1;
5829
5830         memcpy(to, from, len);
5831
5832         return 0;
5833 }
5834
5835 void *nft_set_elem_init(const struct nft_set *set,
5836                         const struct nft_set_ext_tmpl *tmpl,
5837                         const u32 *key, const u32 *key_end,
5838                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5839 {
5840         struct nft_set_ext *ext;
5841         void *elem;
5842
5843         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5844         if (elem == NULL)
5845                 return ERR_PTR(-ENOMEM);
5846
5847         ext = nft_set_elem_ext(set, elem);
5848         nft_set_ext_init(ext, tmpl);
5849
5850         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5851             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5852                                nft_set_ext_key(ext), key, set->klen) < 0)
5853                 goto err_ext_check;
5854
5855         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5856             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5857                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5858                 goto err_ext_check;
5859
5860         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5861             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5862                                nft_set_ext_data(ext), data, set->dlen) < 0)
5863                 goto err_ext_check;
5864
5865         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5866                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5867                 if (expiration == 0)
5868                         *nft_set_ext_expiration(ext) += timeout;
5869         }
5870         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5871                 *nft_set_ext_timeout(ext) = timeout;
5872
5873         return elem;
5874
5875 err_ext_check:
5876         kfree(elem);
5877
5878         return ERR_PTR(-EINVAL);
5879 }
5880
5881 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5882                                         struct nft_expr *expr)
5883 {
5884         if (expr->ops->destroy_clone) {
5885                 expr->ops->destroy_clone(ctx, expr);
5886                 module_put(expr->ops->type->owner);
5887         } else {
5888                 nf_tables_expr_destroy(ctx, expr);
5889         }
5890 }
5891
5892 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5893                                       struct nft_set_elem_expr *elem_expr)
5894 {
5895         struct nft_expr *expr;
5896         u32 size;
5897
5898         nft_setelem_expr_foreach(expr, elem_expr, size)
5899                 __nft_set_elem_expr_destroy(ctx, expr);
5900 }
5901
5902 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5903                           bool destroy_expr)
5904 {
5905         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5906         struct nft_ctx ctx = {
5907                 .net    = read_pnet(&set->net),
5908                 .family = set->table->family,
5909         };
5910
5911         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5912         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5913                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5914         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5915                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5916
5917         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5918                 (*nft_set_ext_obj(ext))->use--;
5919         kfree(elem);
5920 }
5921 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5922
5923 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5924  * with the refcounting from the preparation phase.
5925  */
5926 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5927                                        const struct nft_set *set, void *elem)
5928 {
5929         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5930
5931         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5932                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5933
5934         kfree(elem);
5935 }
5936
5937 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5938                             struct nft_expr *expr_array[])
5939 {
5940         struct nft_expr *expr;
5941         int err, i, k;
5942
5943         for (i = 0; i < set->num_exprs; i++) {
5944                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5945                 if (!expr)
5946                         goto err_expr;
5947
5948                 err = nft_expr_clone(expr, set->exprs[i]);
5949                 if (err < 0) {
5950                         kfree(expr);
5951                         goto err_expr;
5952                 }
5953                 expr_array[i] = expr;
5954         }
5955
5956         return 0;
5957
5958 err_expr:
5959         for (k = i - 1; k >= 0; k--)
5960                 nft_expr_destroy(ctx, expr_array[k]);
5961
5962         return -ENOMEM;
5963 }
5964
5965 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5966                                    const struct nft_set_ext_tmpl *tmpl,
5967                                    const struct nft_set_ext *ext,
5968                                    struct nft_expr *expr_array[],
5969                                    u32 num_exprs)
5970 {
5971         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5972         u32 len = sizeof(struct nft_set_elem_expr);
5973         struct nft_expr *expr;
5974         int i, err;
5975
5976         if (num_exprs == 0)
5977                 return 0;
5978
5979         for (i = 0; i < num_exprs; i++)
5980                 len += expr_array[i]->ops->size;
5981
5982         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5983                 return -EINVAL;
5984
5985         for (i = 0; i < num_exprs; i++) {
5986                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5987                 err = nft_expr_clone(expr, expr_array[i]);
5988                 if (err < 0)
5989                         goto err_elem_expr_setup;
5990
5991                 elem_expr->size += expr_array[i]->ops->size;
5992                 nft_expr_destroy(ctx, expr_array[i]);
5993                 expr_array[i] = NULL;
5994         }
5995
5996         return 0;
5997
5998 err_elem_expr_setup:
5999         for (; i < num_exprs; i++) {
6000                 nft_expr_destroy(ctx, expr_array[i]);
6001                 expr_array[i] = NULL;
6002         }
6003
6004         return -ENOMEM;
6005 }
6006
6007 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6008                                             const struct nft_set *set)
6009 {
6010         struct nft_set_elem_catchall *catchall;
6011         u8 genmask = nft_genmask_cur(net);
6012         struct nft_set_ext *ext;
6013
6014         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6015                 ext = nft_set_elem_ext(set, catchall->elem);
6016                 if (nft_set_elem_active(ext, genmask) &&
6017                     !nft_set_elem_expired(ext))
6018                         return ext;
6019         }
6020
6021         return NULL;
6022 }
6023 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6024
6025 void *nft_set_catchall_gc(const struct nft_set *set)
6026 {
6027         struct nft_set_elem_catchall *catchall, *next;
6028         struct nft_set_ext *ext;
6029         void *elem = NULL;
6030
6031         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6032                 ext = nft_set_elem_ext(set, catchall->elem);
6033
6034                 if (!nft_set_elem_expired(ext) ||
6035                     nft_set_elem_mark_busy(ext))
6036                         continue;
6037
6038                 elem = catchall->elem;
6039                 list_del_rcu(&catchall->list);
6040                 kfree_rcu(catchall, rcu);
6041                 break;
6042         }
6043
6044         return elem;
6045 }
6046 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6047
6048 static int nft_setelem_catchall_insert(const struct net *net,
6049                                        struct nft_set *set,
6050                                        const struct nft_set_elem *elem,
6051                                        struct nft_set_ext **pext)
6052 {
6053         struct nft_set_elem_catchall *catchall;
6054         u8 genmask = nft_genmask_next(net);
6055         struct nft_set_ext *ext;
6056
6057         list_for_each_entry(catchall, &set->catchall_list, list) {
6058                 ext = nft_set_elem_ext(set, catchall->elem);
6059                 if (nft_set_elem_active(ext, genmask)) {
6060                         *pext = ext;
6061                         return -EEXIST;
6062                 }
6063         }
6064
6065         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6066         if (!catchall)
6067                 return -ENOMEM;
6068
6069         catchall->elem = elem->priv;
6070         list_add_tail_rcu(&catchall->list, &set->catchall_list);
6071
6072         return 0;
6073 }
6074
6075 static int nft_setelem_insert(const struct net *net,
6076                               struct nft_set *set,
6077                               const struct nft_set_elem *elem,
6078                               struct nft_set_ext **ext, unsigned int flags)
6079 {
6080         int ret;
6081
6082         if (flags & NFT_SET_ELEM_CATCHALL)
6083                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6084         else
6085                 ret = set->ops->insert(net, set, elem, ext);
6086
6087         return ret;
6088 }
6089
6090 static bool nft_setelem_is_catchall(const struct nft_set *set,
6091                                     const struct nft_set_elem *elem)
6092 {
6093         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6094
6095         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6096             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6097                 return true;
6098
6099         return false;
6100 }
6101
6102 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6103                                  struct nft_set_elem *elem)
6104 {
6105         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6106
6107         if (nft_setelem_is_catchall(set, elem)) {
6108                 nft_set_elem_change_active(net, set, ext);
6109                 nft_set_elem_clear_busy(ext);
6110         } else {
6111                 set->ops->activate(net, set, elem);
6112         }
6113 }
6114
6115 static int nft_setelem_catchall_deactivate(const struct net *net,
6116                                            struct nft_set *set,
6117                                            struct nft_set_elem *elem)
6118 {
6119         struct nft_set_elem_catchall *catchall;
6120         struct nft_set_ext *ext;
6121
6122         list_for_each_entry(catchall, &set->catchall_list, list) {
6123                 ext = nft_set_elem_ext(set, catchall->elem);
6124                 if (!nft_is_active(net, ext) ||
6125                     nft_set_elem_mark_busy(ext))
6126                         continue;
6127
6128                 kfree(elem->priv);
6129                 elem->priv = catchall->elem;
6130                 nft_set_elem_change_active(net, set, ext);
6131                 return 0;
6132         }
6133
6134         return -ENOENT;
6135 }
6136
6137 static int __nft_setelem_deactivate(const struct net *net,
6138                                     struct nft_set *set,
6139                                     struct nft_set_elem *elem)
6140 {
6141         void *priv;
6142
6143         priv = set->ops->deactivate(net, set, elem);
6144         if (!priv)
6145                 return -ENOENT;
6146
6147         kfree(elem->priv);
6148         elem->priv = priv;
6149         set->ndeact++;
6150
6151         return 0;
6152 }
6153
6154 static int nft_setelem_deactivate(const struct net *net,
6155                                   struct nft_set *set,
6156                                   struct nft_set_elem *elem, u32 flags)
6157 {
6158         int ret;
6159
6160         if (flags & NFT_SET_ELEM_CATCHALL)
6161                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6162         else
6163                 ret = __nft_setelem_deactivate(net, set, elem);
6164
6165         return ret;
6166 }
6167
6168 static void nft_setelem_catchall_remove(const struct net *net,
6169                                         const struct nft_set *set,
6170                                         const struct nft_set_elem *elem)
6171 {
6172         struct nft_set_elem_catchall *catchall, *next;
6173
6174         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6175                 if (catchall->elem == elem->priv) {
6176                         list_del_rcu(&catchall->list);
6177                         kfree_rcu(catchall, rcu);
6178                         break;
6179                 }
6180         }
6181 }
6182
6183 static void nft_setelem_remove(const struct net *net,
6184                                const struct nft_set *set,
6185                                const struct nft_set_elem *elem)
6186 {
6187         if (nft_setelem_is_catchall(set, elem))
6188                 nft_setelem_catchall_remove(net, set, elem);
6189         else
6190                 set->ops->remove(net, set, elem);
6191 }
6192
6193 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6194                                       struct nlattr **nla, u32 flags)
6195 {
6196         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6197                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6198                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6199                         return false;
6200
6201                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6202                     flags & NFT_SET_ELEM_CATCHALL)
6203                         return false;
6204         } else {
6205                 if (nla[NFTA_SET_ELEM_KEY_END])
6206                         return false;
6207         }
6208
6209         return true;
6210 }
6211
6212 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6213                             const struct nlattr *attr, u32 nlmsg_flags)
6214 {
6215         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6216         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6217         u8 genmask = nft_genmask_next(ctx->net);
6218         u32 flags = 0, size = 0, num_exprs = 0;
6219         struct nft_set_ext_tmpl tmpl;
6220         struct nft_set_ext *ext, *ext2;
6221         struct nft_set_elem elem;
6222         struct nft_set_binding *binding;
6223         struct nft_object *obj = NULL;
6224         struct nft_userdata *udata;
6225         struct nft_data_desc desc;
6226         enum nft_registers dreg;
6227         struct nft_trans *trans;
6228         u64 timeout;
6229         u64 expiration;
6230         int err, i;
6231         u8 ulen;
6232
6233         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6234                                           nft_set_elem_policy, NULL);
6235         if (err < 0)
6236                 return err;
6237
6238         nft_set_ext_prepare(&tmpl);
6239
6240         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6241         if (err < 0)
6242                 return err;
6243
6244         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6245             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6246                 return -EINVAL;
6247
6248         if (flags != 0) {
6249                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6250                 if (err < 0)
6251                         return err;
6252         }
6253
6254         if (set->flags & NFT_SET_MAP) {
6255                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6256                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6257                         return -EINVAL;
6258         } else {
6259                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6260                         return -EINVAL;
6261         }
6262
6263         if (set->flags & NFT_SET_OBJECT) {
6264                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6265                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6266                         return -EINVAL;
6267         } else {
6268                 if (nla[NFTA_SET_ELEM_OBJREF])
6269                         return -EINVAL;
6270         }
6271
6272         if (!nft_setelem_valid_key_end(set, nla, flags))
6273                 return -EINVAL;
6274
6275         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6276              (nla[NFTA_SET_ELEM_DATA] ||
6277               nla[NFTA_SET_ELEM_OBJREF] ||
6278               nla[NFTA_SET_ELEM_TIMEOUT] ||
6279               nla[NFTA_SET_ELEM_EXPIRATION] ||
6280               nla[NFTA_SET_ELEM_USERDATA] ||
6281               nla[NFTA_SET_ELEM_EXPR] ||
6282               nla[NFTA_SET_ELEM_KEY_END] ||
6283               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6284                 return -EINVAL;
6285
6286         timeout = 0;
6287         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6288                 if (!(set->flags & NFT_SET_TIMEOUT))
6289                         return -EINVAL;
6290                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6291                                             &timeout);
6292                 if (err)
6293                         return err;
6294         } else if (set->flags & NFT_SET_TIMEOUT &&
6295                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6296                 timeout = READ_ONCE(set->timeout);
6297         }
6298
6299         expiration = 0;
6300         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6301                 if (!(set->flags & NFT_SET_TIMEOUT))
6302                         return -EINVAL;
6303                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6304                                             &expiration);
6305                 if (err)
6306                         return err;
6307         }
6308
6309         if (nla[NFTA_SET_ELEM_EXPR]) {
6310                 struct nft_expr *expr;
6311
6312                 if (set->num_exprs && set->num_exprs != 1)
6313                         return -EOPNOTSUPP;
6314
6315                 expr = nft_set_elem_expr_alloc(ctx, set,
6316                                                nla[NFTA_SET_ELEM_EXPR]);
6317                 if (IS_ERR(expr))
6318                         return PTR_ERR(expr);
6319
6320                 expr_array[0] = expr;
6321                 num_exprs = 1;
6322
6323                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6324                         err = -EOPNOTSUPP;
6325                         goto err_set_elem_expr;
6326                 }
6327         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6328                 struct nft_expr *expr;
6329                 struct nlattr *tmp;
6330                 int left;
6331
6332                 i = 0;
6333                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6334                         if (i == NFT_SET_EXPR_MAX ||
6335                             (set->num_exprs && set->num_exprs == i)) {
6336                                 err = -E2BIG;
6337                                 goto err_set_elem_expr;
6338                         }
6339                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6340                                 err = -EINVAL;
6341                                 goto err_set_elem_expr;
6342                         }
6343                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6344                         if (IS_ERR(expr)) {
6345                                 err = PTR_ERR(expr);
6346                                 goto err_set_elem_expr;
6347                         }
6348                         expr_array[i] = expr;
6349                         num_exprs++;
6350
6351                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6352                                 err = -EOPNOTSUPP;
6353                                 goto err_set_elem_expr;
6354                         }
6355                         i++;
6356                 }
6357                 if (set->num_exprs && set->num_exprs != i) {
6358                         err = -EOPNOTSUPP;
6359                         goto err_set_elem_expr;
6360                 }
6361         } else if (set->num_exprs > 0 &&
6362                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6363                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6364                 if (err < 0)
6365                         goto err_set_elem_expr_clone;
6366
6367                 num_exprs = set->num_exprs;
6368         }
6369
6370         if (nla[NFTA_SET_ELEM_KEY]) {
6371                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6372                                             nla[NFTA_SET_ELEM_KEY]);
6373                 if (err < 0)
6374                         goto err_set_elem_expr;
6375
6376                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6377                 if (err < 0)
6378                         goto err_parse_key;
6379         }
6380
6381         if (nla[NFTA_SET_ELEM_KEY_END]) {
6382                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6383                                             nla[NFTA_SET_ELEM_KEY_END]);
6384                 if (err < 0)
6385                         goto err_parse_key;
6386
6387                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6388                 if (err < 0)
6389                         goto err_parse_key_end;
6390         }
6391
6392         if (timeout > 0) {
6393                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6394                 if (err < 0)
6395                         goto err_parse_key_end;
6396
6397                 if (timeout != READ_ONCE(set->timeout)) {
6398                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6399                         if (err < 0)
6400                                 goto err_parse_key_end;
6401                 }
6402         }
6403
6404         if (num_exprs) {
6405                 for (i = 0; i < num_exprs; i++)
6406                         size += expr_array[i]->ops->size;
6407
6408                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6409                                              sizeof(struct nft_set_elem_expr) + size);
6410                 if (err < 0)
6411                         goto err_parse_key_end;
6412         }
6413
6414         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6415                 obj = nft_obj_lookup(ctx->net, ctx->table,
6416                                      nla[NFTA_SET_ELEM_OBJREF],
6417                                      set->objtype, genmask);
6418                 if (IS_ERR(obj)) {
6419                         err = PTR_ERR(obj);
6420                         goto err_parse_key_end;
6421                 }
6422                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6423                 if (err < 0)
6424                         goto err_parse_key_end;
6425         }
6426
6427         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6428                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6429                                              nla[NFTA_SET_ELEM_DATA]);
6430                 if (err < 0)
6431                         goto err_parse_key_end;
6432
6433                 dreg = nft_type_to_reg(set->dtype);
6434                 list_for_each_entry(binding, &set->bindings, list) {
6435                         struct nft_ctx bind_ctx = {
6436                                 .net    = ctx->net,
6437                                 .family = ctx->family,
6438                                 .table  = ctx->table,
6439                                 .chain  = (struct nft_chain *)binding->chain,
6440                         };
6441
6442                         if (!(binding->flags & NFT_SET_MAP))
6443                                 continue;
6444
6445                         err = nft_validate_register_store(&bind_ctx, dreg,
6446                                                           &elem.data.val,
6447                                                           desc.type, desc.len);
6448                         if (err < 0)
6449                                 goto err_parse_data;
6450
6451                         if (desc.type == NFT_DATA_VERDICT &&
6452                             (elem.data.val.verdict.code == NFT_GOTO ||
6453                              elem.data.val.verdict.code == NFT_JUMP))
6454                                 nft_validate_state_update(ctx->table,
6455                                                           NFT_VALIDATE_NEED);
6456                 }
6457
6458                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6459                 if (err < 0)
6460                         goto err_parse_data;
6461         }
6462
6463         /* The full maximum length of userdata can exceed the maximum
6464          * offset value (U8_MAX) for following extensions, therefor it
6465          * must be the last extension added.
6466          */
6467         ulen = 0;
6468         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6469                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6470                 if (ulen > 0) {
6471                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6472                                                      ulen);
6473                         if (err < 0)
6474                                 goto err_parse_data;
6475                 }
6476         }
6477
6478         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6479                                       elem.key_end.val.data, elem.data.val.data,
6480                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6481         if (IS_ERR(elem.priv)) {
6482                 err = PTR_ERR(elem.priv);
6483                 goto err_parse_data;
6484         }
6485
6486         ext = nft_set_elem_ext(set, elem.priv);
6487         if (flags)
6488                 *nft_set_ext_flags(ext) = flags;
6489
6490         if (ulen > 0) {
6491                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6492                         err = -EINVAL;
6493                         goto err_elem_userdata;
6494                 }
6495                 udata = nft_set_ext_userdata(ext);
6496                 udata->len = ulen - 1;
6497                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6498         }
6499         if (obj) {
6500                 *nft_set_ext_obj(ext) = obj;
6501                 obj->use++;
6502         }
6503         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6504         if (err < 0)
6505                 goto err_elem_free;
6506
6507         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6508         if (trans == NULL) {
6509                 err = -ENOMEM;
6510                 goto err_elem_free;
6511         }
6512
6513         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6514
6515         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6516         if (err) {
6517                 if (err == -EEXIST) {
6518                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6519                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6520                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6521                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6522                                 goto err_element_clash;
6523                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6524                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6525                              memcmp(nft_set_ext_data(ext),
6526                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6527                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6528                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6529                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6530                                 goto err_element_clash;
6531                         else if (!(nlmsg_flags & NLM_F_EXCL))
6532                                 err = 0;
6533                 } else if (err == -ENOTEMPTY) {
6534                         /* ENOTEMPTY reports overlapping between this element
6535                          * and an existing one.
6536                          */
6537                         err = -EEXIST;
6538                 }
6539                 goto err_element_clash;
6540         }
6541
6542         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6543             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6544                 err = -ENFILE;
6545                 goto err_set_full;
6546         }
6547
6548         nft_trans_elem(trans) = elem;
6549         nft_trans_commit_list_add_tail(ctx->net, trans);
6550         return 0;
6551
6552 err_set_full:
6553         nft_setelem_remove(ctx->net, set, &elem);
6554 err_element_clash:
6555         kfree(trans);
6556 err_elem_free:
6557         if (obj)
6558                 obj->use--;
6559 err_elem_userdata:
6560         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6561 err_parse_data:
6562         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6563                 nft_data_release(&elem.data.val, desc.type);
6564 err_parse_key_end:
6565         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6566 err_parse_key:
6567         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6568 err_set_elem_expr:
6569         for (i = 0; i < num_exprs && expr_array[i]; i++)
6570                 nft_expr_destroy(ctx, expr_array[i]);
6571 err_set_elem_expr_clone:
6572         return err;
6573 }
6574
6575 static int nf_tables_newsetelem(struct sk_buff *skb,
6576                                 const struct nfnl_info *info,
6577                                 const struct nlattr * const nla[])
6578 {
6579         struct netlink_ext_ack *extack = info->extack;
6580         u8 genmask = nft_genmask_next(info->net);
6581         u8 family = info->nfmsg->nfgen_family;
6582         struct net *net = info->net;
6583         const struct nlattr *attr;
6584         struct nft_table *table;
6585         struct nft_set *set;
6586         struct nft_ctx ctx;
6587         int rem, err;
6588
6589         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6590                 return -EINVAL;
6591
6592         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6593                                  genmask, NETLINK_CB(skb).portid);
6594         if (IS_ERR(table)) {
6595                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6596                 return PTR_ERR(table);
6597         }
6598
6599         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6600                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6601         if (IS_ERR(set))
6602                 return PTR_ERR(set);
6603
6604         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6605                 return -EBUSY;
6606
6607         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6608
6609         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6610                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6611                 if (err < 0) {
6612                         NL_SET_BAD_ATTR(extack, attr);
6613                         return err;
6614                 }
6615         }
6616
6617         if (table->validate_state == NFT_VALIDATE_DO)
6618                 return nft_table_validate(net, table);
6619
6620         return 0;
6621 }
6622
6623 /**
6624  *      nft_data_hold - hold a nft_data item
6625  *
6626  *      @data: struct nft_data to release
6627  *      @type: type of data
6628  *
6629  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6630  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6631  *      NFT_GOTO verdicts. This function must be called on active data objects
6632  *      from the second phase of the commit protocol.
6633  */
6634 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6635 {
6636         struct nft_chain *chain;
6637         struct nft_rule *rule;
6638
6639         if (type == NFT_DATA_VERDICT) {
6640                 switch (data->verdict.code) {
6641                 case NFT_JUMP:
6642                 case NFT_GOTO:
6643                         chain = data->verdict.chain;
6644                         chain->use++;
6645
6646                         if (!nft_chain_is_bound(chain))
6647                                 break;
6648
6649                         chain->table->use++;
6650                         list_for_each_entry(rule, &chain->rules, list)
6651                                 chain->use++;
6652
6653                         nft_chain_add(chain->table, chain);
6654                         break;
6655                 }
6656         }
6657 }
6658
6659 static void nft_setelem_data_activate(const struct net *net,
6660                                       const struct nft_set *set,
6661                                       struct nft_set_elem *elem)
6662 {
6663         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6664
6665         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6666                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6667         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6668                 (*nft_set_ext_obj(ext))->use++;
6669 }
6670
6671 static void nft_setelem_data_deactivate(const struct net *net,
6672                                         const struct nft_set *set,
6673                                         struct nft_set_elem *elem)
6674 {
6675         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6676
6677         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6678                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6679         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6680                 (*nft_set_ext_obj(ext))->use--;
6681 }
6682
6683 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6684                            const struct nlattr *attr)
6685 {
6686         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6687         struct nft_set_ext_tmpl tmpl;
6688         struct nft_set_elem elem;
6689         struct nft_set_ext *ext;
6690         struct nft_trans *trans;
6691         u32 flags = 0;
6692         int err;
6693
6694         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6695                                           nft_set_elem_policy, NULL);
6696         if (err < 0)
6697                 return err;
6698
6699         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6700         if (err < 0)
6701                 return err;
6702
6703         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6704                 return -EINVAL;
6705
6706         if (!nft_setelem_valid_key_end(set, nla, flags))
6707                 return -EINVAL;
6708
6709         nft_set_ext_prepare(&tmpl);
6710
6711         if (flags != 0) {
6712                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6713                 if (err < 0)
6714                         return err;
6715         }
6716
6717         if (nla[NFTA_SET_ELEM_KEY]) {
6718                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6719                                             nla[NFTA_SET_ELEM_KEY]);
6720                 if (err < 0)
6721                         return err;
6722
6723                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6724                 if (err < 0)
6725                         goto fail_elem;
6726         }
6727
6728         if (nla[NFTA_SET_ELEM_KEY_END]) {
6729                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6730                                             nla[NFTA_SET_ELEM_KEY_END]);
6731                 if (err < 0)
6732                         goto fail_elem;
6733
6734                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6735                 if (err < 0)
6736                         goto fail_elem_key_end;
6737         }
6738
6739         err = -ENOMEM;
6740         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6741                                       elem.key_end.val.data, NULL, 0, 0,
6742                                       GFP_KERNEL_ACCOUNT);
6743         if (IS_ERR(elem.priv)) {
6744                 err = PTR_ERR(elem.priv);
6745                 goto fail_elem_key_end;
6746         }
6747
6748         ext = nft_set_elem_ext(set, elem.priv);
6749         if (flags)
6750                 *nft_set_ext_flags(ext) = flags;
6751
6752         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6753         if (trans == NULL)
6754                 goto fail_trans;
6755
6756         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6757         if (err < 0)
6758                 goto fail_ops;
6759
6760         nft_setelem_data_deactivate(ctx->net, set, &elem);
6761
6762         nft_trans_elem(trans) = elem;
6763         nft_trans_commit_list_add_tail(ctx->net, trans);
6764         return 0;
6765
6766 fail_ops:
6767         kfree(trans);
6768 fail_trans:
6769         kfree(elem.priv);
6770 fail_elem_key_end:
6771         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6772 fail_elem:
6773         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6774         return err;
6775 }
6776
6777 static int nft_setelem_flush(const struct nft_ctx *ctx,
6778                              struct nft_set *set,
6779                              const struct nft_set_iter *iter,
6780                              struct nft_set_elem *elem)
6781 {
6782         struct nft_trans *trans;
6783         int err;
6784
6785         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6786                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6787         if (!trans)
6788                 return -ENOMEM;
6789
6790         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6791                 err = -ENOENT;
6792                 goto err1;
6793         }
6794         set->ndeact++;
6795
6796         nft_setelem_data_deactivate(ctx->net, set, elem);
6797         nft_trans_elem_set(trans) = set;
6798         nft_trans_elem(trans) = *elem;
6799         nft_trans_commit_list_add_tail(ctx->net, trans);
6800
6801         return 0;
6802 err1:
6803         kfree(trans);
6804         return err;
6805 }
6806
6807 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6808                                     struct nft_set *set,
6809                                     struct nft_set_elem *elem)
6810 {
6811         struct nft_trans *trans;
6812
6813         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6814                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6815         if (!trans)
6816                 return -ENOMEM;
6817
6818         nft_setelem_data_deactivate(ctx->net, set, elem);
6819         nft_trans_elem_set(trans) = set;
6820         nft_trans_elem(trans) = *elem;
6821         nft_trans_commit_list_add_tail(ctx->net, trans);
6822
6823         return 0;
6824 }
6825
6826 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6827                                   struct nft_set *set)
6828 {
6829         u8 genmask = nft_genmask_next(ctx->net);
6830         struct nft_set_elem_catchall *catchall;
6831         struct nft_set_elem elem;
6832         struct nft_set_ext *ext;
6833         int ret = 0;
6834
6835         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6836                 ext = nft_set_elem_ext(set, catchall->elem);
6837                 if (!nft_set_elem_active(ext, genmask) ||
6838                     nft_set_elem_mark_busy(ext))
6839                         continue;
6840
6841                 elem.priv = catchall->elem;
6842                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6843                 if (ret < 0)
6844                         break;
6845         }
6846
6847         return ret;
6848 }
6849
6850 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6851 {
6852         struct nft_set_iter iter = {
6853                 .genmask        = genmask,
6854                 .fn             = nft_setelem_flush,
6855         };
6856
6857         set->ops->walk(ctx, set, &iter);
6858         if (!iter.err)
6859                 iter.err = nft_set_catchall_flush(ctx, set);
6860
6861         return iter.err;
6862 }
6863
6864 static int nf_tables_delsetelem(struct sk_buff *skb,
6865                                 const struct nfnl_info *info,
6866                                 const struct nlattr * const nla[])
6867 {
6868         struct netlink_ext_ack *extack = info->extack;
6869         u8 genmask = nft_genmask_next(info->net);
6870         u8 family = info->nfmsg->nfgen_family;
6871         struct net *net = info->net;
6872         const struct nlattr *attr;
6873         struct nft_table *table;
6874         struct nft_set *set;
6875         struct nft_ctx ctx;
6876         int rem, err = 0;
6877
6878         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6879                                  genmask, NETLINK_CB(skb).portid);
6880         if (IS_ERR(table)) {
6881                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6882                 return PTR_ERR(table);
6883         }
6884
6885         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6886         if (IS_ERR(set))
6887                 return PTR_ERR(set);
6888         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6889                 return -EBUSY;
6890
6891         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6892
6893         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6894                 return nft_set_flush(&ctx, set, genmask);
6895
6896         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6897                 err = nft_del_setelem(&ctx, set, attr);
6898                 if (err == -ENOENT &&
6899                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
6900                         continue;
6901
6902                 if (err < 0) {
6903                         NL_SET_BAD_ATTR(extack, attr);
6904                         break;
6905                 }
6906         }
6907         return err;
6908 }
6909
6910 void nft_set_gc_batch_release(struct rcu_head *rcu)
6911 {
6912         struct nft_set_gc_batch *gcb;
6913         unsigned int i;
6914
6915         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6916         for (i = 0; i < gcb->head.cnt; i++)
6917                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6918         kfree(gcb);
6919 }
6920
6921 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6922                                                 gfp_t gfp)
6923 {
6924         struct nft_set_gc_batch *gcb;
6925
6926         gcb = kzalloc(sizeof(*gcb), gfp);
6927         if (gcb == NULL)
6928                 return gcb;
6929         gcb->head.set = set;
6930         return gcb;
6931 }
6932
6933 /*
6934  * Stateful objects
6935  */
6936
6937 /**
6938  *      nft_register_obj- register nf_tables stateful object type
6939  *      @obj_type: object type
6940  *
6941  *      Registers the object type for use with nf_tables. Returns zero on
6942  *      success or a negative errno code otherwise.
6943  */
6944 int nft_register_obj(struct nft_object_type *obj_type)
6945 {
6946         if (obj_type->type == NFT_OBJECT_UNSPEC)
6947                 return -EINVAL;
6948
6949         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6950         list_add_rcu(&obj_type->list, &nf_tables_objects);
6951         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6952         return 0;
6953 }
6954 EXPORT_SYMBOL_GPL(nft_register_obj);
6955
6956 /**
6957  *      nft_unregister_obj - unregister nf_tables object type
6958  *      @obj_type: object type
6959  *
6960  *      Unregisters the object type for use with nf_tables.
6961  */
6962 void nft_unregister_obj(struct nft_object_type *obj_type)
6963 {
6964         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6965         list_del_rcu(&obj_type->list);
6966         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6967 }
6968 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6969
6970 struct nft_object *nft_obj_lookup(const struct net *net,
6971                                   const struct nft_table *table,
6972                                   const struct nlattr *nla, u32 objtype,
6973                                   u8 genmask)
6974 {
6975         struct nft_object_hash_key k = { .table = table };
6976         char search[NFT_OBJ_MAXNAMELEN];
6977         struct rhlist_head *tmp, *list;
6978         struct nft_object *obj;
6979
6980         nla_strscpy(search, nla, sizeof(search));
6981         k.name = search;
6982
6983         WARN_ON_ONCE(!rcu_read_lock_held() &&
6984                      !lockdep_commit_lock_is_held(net));
6985
6986         rcu_read_lock();
6987         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6988         if (!list)
6989                 goto out;
6990
6991         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6992                 if (objtype == obj->ops->type->type &&
6993                     nft_active_genmask(obj, genmask)) {
6994                         rcu_read_unlock();
6995                         return obj;
6996                 }
6997         }
6998 out:
6999         rcu_read_unlock();
7000         return ERR_PTR(-ENOENT);
7001 }
7002 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7003
7004 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7005                                                   const struct nlattr *nla,
7006                                                   u32 objtype, u8 genmask)
7007 {
7008         struct nft_object *obj;
7009
7010         list_for_each_entry(obj, &table->objects, list) {
7011                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7012                     objtype == obj->ops->type->type &&
7013                     nft_active_genmask(obj, genmask))
7014                         return obj;
7015         }
7016         return ERR_PTR(-ENOENT);
7017 }
7018
7019 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7020         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
7021                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
7022         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
7023                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
7024         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
7025         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
7026         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
7027         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
7028                                     .len = NFT_USERDATA_MAXLEN },
7029 };
7030
7031 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7032                                        const struct nft_object_type *type,
7033                                        const struct nlattr *attr)
7034 {
7035         struct nlattr **tb;
7036         const struct nft_object_ops *ops;
7037         struct nft_object *obj;
7038         int err = -ENOMEM;
7039
7040         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7041         if (!tb)
7042                 goto err1;
7043
7044         if (attr) {
7045                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7046                                                   type->policy, NULL);
7047                 if (err < 0)
7048                         goto err2;
7049         } else {
7050                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7051         }
7052
7053         if (type->select_ops) {
7054                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7055                 if (IS_ERR(ops)) {
7056                         err = PTR_ERR(ops);
7057                         goto err2;
7058                 }
7059         } else {
7060                 ops = type->ops;
7061         }
7062
7063         err = -ENOMEM;
7064         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7065         if (!obj)
7066                 goto err2;
7067
7068         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7069         if (err < 0)
7070                 goto err3;
7071
7072         obj->ops = ops;
7073
7074         kfree(tb);
7075         return obj;
7076 err3:
7077         kfree(obj);
7078 err2:
7079         kfree(tb);
7080 err1:
7081         return ERR_PTR(err);
7082 }
7083
7084 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7085                            struct nft_object *obj, bool reset)
7086 {
7087         struct nlattr *nest;
7088
7089         nest = nla_nest_start_noflag(skb, attr);
7090         if (!nest)
7091                 goto nla_put_failure;
7092         if (obj->ops->dump(skb, obj, reset) < 0)
7093                 goto nla_put_failure;
7094         nla_nest_end(skb, nest);
7095         return 0;
7096
7097 nla_put_failure:
7098         return -1;
7099 }
7100
7101 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7102 {
7103         const struct nft_object_type *type;
7104
7105         list_for_each_entry(type, &nf_tables_objects, list) {
7106                 if (objtype == type->type)
7107                         return type;
7108         }
7109         return NULL;
7110 }
7111
7112 static const struct nft_object_type *
7113 nft_obj_type_get(struct net *net, u32 objtype)
7114 {
7115         const struct nft_object_type *type;
7116
7117         type = __nft_obj_type_get(objtype);
7118         if (type != NULL && try_module_get(type->owner))
7119                 return type;
7120
7121         lockdep_nfnl_nft_mutex_not_held();
7122 #ifdef CONFIG_MODULES
7123         if (type == NULL) {
7124                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7125                         return ERR_PTR(-EAGAIN);
7126         }
7127 #endif
7128         return ERR_PTR(-ENOENT);
7129 }
7130
7131 static int nf_tables_updobj(const struct nft_ctx *ctx,
7132                             const struct nft_object_type *type,
7133                             const struct nlattr *attr,
7134                             struct nft_object *obj)
7135 {
7136         struct nft_object *newobj;
7137         struct nft_trans *trans;
7138         int err = -ENOMEM;
7139
7140         if (!try_module_get(type->owner))
7141                 return -ENOENT;
7142
7143         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7144                                 sizeof(struct nft_trans_obj));
7145         if (!trans)
7146                 goto err_trans;
7147
7148         newobj = nft_obj_init(ctx, type, attr);
7149         if (IS_ERR(newobj)) {
7150                 err = PTR_ERR(newobj);
7151                 goto err_free_trans;
7152         }
7153
7154         nft_trans_obj(trans) = obj;
7155         nft_trans_obj_update(trans) = true;
7156         nft_trans_obj_newobj(trans) = newobj;
7157         nft_trans_commit_list_add_tail(ctx->net, trans);
7158
7159         return 0;
7160
7161 err_free_trans:
7162         kfree(trans);
7163 err_trans:
7164         module_put(type->owner);
7165         return err;
7166 }
7167
7168 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7169                             const struct nlattr * const nla[])
7170 {
7171         struct netlink_ext_ack *extack = info->extack;
7172         u8 genmask = nft_genmask_next(info->net);
7173         u8 family = info->nfmsg->nfgen_family;
7174         const struct nft_object_type *type;
7175         struct net *net = info->net;
7176         struct nft_table *table;
7177         struct nft_object *obj;
7178         struct nft_ctx ctx;
7179         u32 objtype;
7180         int err;
7181
7182         if (!nla[NFTA_OBJ_TYPE] ||
7183             !nla[NFTA_OBJ_NAME] ||
7184             !nla[NFTA_OBJ_DATA])
7185                 return -EINVAL;
7186
7187         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7188                                  NETLINK_CB(skb).portid);
7189         if (IS_ERR(table)) {
7190                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7191                 return PTR_ERR(table);
7192         }
7193
7194         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7195         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7196         if (IS_ERR(obj)) {
7197                 err = PTR_ERR(obj);
7198                 if (err != -ENOENT) {
7199                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7200                         return err;
7201                 }
7202         } else {
7203                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7204                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7205                         return -EEXIST;
7206                 }
7207                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7208                         return -EOPNOTSUPP;
7209
7210                 type = __nft_obj_type_get(objtype);
7211                 if (WARN_ON_ONCE(!type))
7212                         return -ENOENT;
7213
7214                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7215
7216                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7217         }
7218
7219         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7220
7221         type = nft_obj_type_get(net, objtype);
7222         if (IS_ERR(type))
7223                 return PTR_ERR(type);
7224
7225         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7226         if (IS_ERR(obj)) {
7227                 err = PTR_ERR(obj);
7228                 goto err_init;
7229         }
7230         obj->key.table = table;
7231         obj->handle = nf_tables_alloc_handle(table);
7232
7233         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7234         if (!obj->key.name) {
7235                 err = -ENOMEM;
7236                 goto err_strdup;
7237         }
7238
7239         if (nla[NFTA_OBJ_USERDATA]) {
7240                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7241                 if (obj->udata == NULL)
7242                         goto err_userdata;
7243
7244                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7245         }
7246
7247         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7248         if (err < 0)
7249                 goto err_trans;
7250
7251         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7252                               nft_objname_ht_params);
7253         if (err < 0)
7254                 goto err_obj_ht;
7255
7256         list_add_tail_rcu(&obj->list, &table->objects);
7257         table->use++;
7258         return 0;
7259 err_obj_ht:
7260         /* queued in transaction log */
7261         INIT_LIST_HEAD(&obj->list);
7262         return err;
7263 err_trans:
7264         kfree(obj->udata);
7265 err_userdata:
7266         kfree(obj->key.name);
7267 err_strdup:
7268         if (obj->ops->destroy)
7269                 obj->ops->destroy(&ctx, obj);
7270         kfree(obj);
7271 err_init:
7272         module_put(type->owner);
7273         return err;
7274 }
7275
7276 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7277                                    u32 portid, u32 seq, int event, u32 flags,
7278                                    int family, const struct nft_table *table,
7279                                    struct nft_object *obj, bool reset)
7280 {
7281         struct nlmsghdr *nlh;
7282
7283         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7284         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7285                            NFNETLINK_V0, nft_base_seq(net));
7286         if (!nlh)
7287                 goto nla_put_failure;
7288
7289         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7290             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7291             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7292                          NFTA_OBJ_PAD))
7293                 goto nla_put_failure;
7294
7295         if (event == NFT_MSG_DELOBJ) {
7296                 nlmsg_end(skb, nlh);
7297                 return 0;
7298         }
7299
7300         if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7301             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7302             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7303                 goto nla_put_failure;
7304
7305         if (obj->udata &&
7306             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7307                 goto nla_put_failure;
7308
7309         nlmsg_end(skb, nlh);
7310         return 0;
7311
7312 nla_put_failure:
7313         nlmsg_trim(skb, nlh);
7314         return -1;
7315 }
7316
7317 struct nft_obj_filter {
7318         char            *table;
7319         u32             type;
7320 };
7321
7322 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7323 {
7324         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7325         const struct nft_table *table;
7326         unsigned int idx = 0, s_idx = cb->args[0];
7327         struct nft_obj_filter *filter = cb->data;
7328         struct net *net = sock_net(skb->sk);
7329         int family = nfmsg->nfgen_family;
7330         struct nftables_pernet *nft_net;
7331         struct nft_object *obj;
7332         bool reset = false;
7333
7334         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7335                 reset = true;
7336
7337         rcu_read_lock();
7338         nft_net = nft_pernet(net);
7339         cb->seq = READ_ONCE(nft_net->base_seq);
7340
7341         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7342                 if (family != NFPROTO_UNSPEC && family != table->family)
7343                         continue;
7344
7345                 list_for_each_entry_rcu(obj, &table->objects, list) {
7346                         if (!nft_is_active(net, obj))
7347                                 goto cont;
7348                         if (idx < s_idx)
7349                                 goto cont;
7350                         if (idx > s_idx)
7351                                 memset(&cb->args[1], 0,
7352                                        sizeof(cb->args) - sizeof(cb->args[0]));
7353                         if (filter && filter->table &&
7354                             strcmp(filter->table, table->name))
7355                                 goto cont;
7356                         if (filter &&
7357                             filter->type != NFT_OBJECT_UNSPEC &&
7358                             obj->ops->type->type != filter->type)
7359                                 goto cont;
7360                         if (reset) {
7361                                 char *buf = kasprintf(GFP_ATOMIC,
7362                                                       "%s:%u",
7363                                                       table->name,
7364                                                       nft_net->base_seq);
7365
7366                                 audit_log_nfcfg(buf,
7367                                                 family,
7368                                                 obj->handle,
7369                                                 AUDIT_NFT_OP_OBJ_RESET,
7370                                                 GFP_ATOMIC);
7371                                 kfree(buf);
7372                         }
7373
7374                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7375                                                     cb->nlh->nlmsg_seq,
7376                                                     NFT_MSG_NEWOBJ,
7377                                                     NLM_F_MULTI | NLM_F_APPEND,
7378                                                     table->family, table,
7379                                                     obj, reset) < 0)
7380                                 goto done;
7381
7382                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7383 cont:
7384                         idx++;
7385                 }
7386         }
7387 done:
7388         rcu_read_unlock();
7389
7390         cb->args[0] = idx;
7391         return skb->len;
7392 }
7393
7394 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7395 {
7396         const struct nlattr * const *nla = cb->data;
7397         struct nft_obj_filter *filter = NULL;
7398
7399         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7400                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7401                 if (!filter)
7402                         return -ENOMEM;
7403
7404                 if (nla[NFTA_OBJ_TABLE]) {
7405                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7406                         if (!filter->table) {
7407                                 kfree(filter);
7408                                 return -ENOMEM;
7409                         }
7410                 }
7411
7412                 if (nla[NFTA_OBJ_TYPE])
7413                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7414         }
7415
7416         cb->data = filter;
7417         return 0;
7418 }
7419
7420 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7421 {
7422         struct nft_obj_filter *filter = cb->data;
7423
7424         if (filter) {
7425                 kfree(filter->table);
7426                 kfree(filter);
7427         }
7428
7429         return 0;
7430 }
7431
7432 /* called with rcu_read_lock held */
7433 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7434                             const struct nlattr * const nla[])
7435 {
7436         struct netlink_ext_ack *extack = info->extack;
7437         u8 genmask = nft_genmask_cur(info->net);
7438         u8 family = info->nfmsg->nfgen_family;
7439         const struct nft_table *table;
7440         struct net *net = info->net;
7441         struct nft_object *obj;
7442         struct sk_buff *skb2;
7443         bool reset = false;
7444         u32 objtype;
7445         int err;
7446
7447         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7448                 struct netlink_dump_control c = {
7449                         .start = nf_tables_dump_obj_start,
7450                         .dump = nf_tables_dump_obj,
7451                         .done = nf_tables_dump_obj_done,
7452                         .module = THIS_MODULE,
7453                         .data = (void *)nla,
7454                 };
7455
7456                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7457         }
7458
7459         if (!nla[NFTA_OBJ_NAME] ||
7460             !nla[NFTA_OBJ_TYPE])
7461                 return -EINVAL;
7462
7463         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7464         if (IS_ERR(table)) {
7465                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7466                 return PTR_ERR(table);
7467         }
7468
7469         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7470         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7471         if (IS_ERR(obj)) {
7472                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7473                 return PTR_ERR(obj);
7474         }
7475
7476         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7477         if (!skb2)
7478                 return -ENOMEM;
7479
7480         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7481                 reset = true;
7482
7483         if (reset) {
7484                 const struct nftables_pernet *nft_net;
7485                 char *buf;
7486
7487                 nft_net = nft_pernet(net);
7488                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7489
7490                 audit_log_nfcfg(buf,
7491                                 family,
7492                                 obj->handle,
7493                                 AUDIT_NFT_OP_OBJ_RESET,
7494                                 GFP_ATOMIC);
7495                 kfree(buf);
7496         }
7497
7498         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7499                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7500                                       family, table, obj, reset);
7501         if (err < 0)
7502                 goto err_fill_obj_info;
7503
7504         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7505
7506 err_fill_obj_info:
7507         kfree_skb(skb2);
7508         return err;
7509 }
7510
7511 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7512 {
7513         if (obj->ops->destroy)
7514                 obj->ops->destroy(ctx, obj);
7515
7516         module_put(obj->ops->type->owner);
7517         kfree(obj->key.name);
7518         kfree(obj->udata);
7519         kfree(obj);
7520 }
7521
7522 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7523                             const struct nlattr * const nla[])
7524 {
7525         struct netlink_ext_ack *extack = info->extack;
7526         u8 genmask = nft_genmask_next(info->net);
7527         u8 family = info->nfmsg->nfgen_family;
7528         struct net *net = info->net;
7529         const struct nlattr *attr;
7530         struct nft_table *table;
7531         struct nft_object *obj;
7532         struct nft_ctx ctx;
7533         u32 objtype;
7534
7535         if (!nla[NFTA_OBJ_TYPE] ||
7536             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7537                 return -EINVAL;
7538
7539         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7540                                  NETLINK_CB(skb).portid);
7541         if (IS_ERR(table)) {
7542                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7543                 return PTR_ERR(table);
7544         }
7545
7546         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7547         if (nla[NFTA_OBJ_HANDLE]) {
7548                 attr = nla[NFTA_OBJ_HANDLE];
7549                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7550         } else {
7551                 attr = nla[NFTA_OBJ_NAME];
7552                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7553         }
7554
7555         if (IS_ERR(obj)) {
7556                 if (PTR_ERR(obj) == -ENOENT &&
7557                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7558                         return 0;
7559
7560                 NL_SET_BAD_ATTR(extack, attr);
7561                 return PTR_ERR(obj);
7562         }
7563         if (obj->use > 0) {
7564                 NL_SET_BAD_ATTR(extack, attr);
7565                 return -EBUSY;
7566         }
7567
7568         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7569
7570         return nft_delobj(&ctx, obj);
7571 }
7572
7573 void nft_obj_notify(struct net *net, const struct nft_table *table,
7574                     struct nft_object *obj, u32 portid, u32 seq, int event,
7575                     u16 flags, int family, int report, gfp_t gfp)
7576 {
7577         struct nftables_pernet *nft_net = nft_pernet(net);
7578         struct sk_buff *skb;
7579         int err;
7580         char *buf = kasprintf(gfp, "%s:%u",
7581                               table->name, nft_net->base_seq);
7582
7583         audit_log_nfcfg(buf,
7584                         family,
7585                         obj->handle,
7586                         event == NFT_MSG_NEWOBJ ?
7587                                  AUDIT_NFT_OP_OBJ_REGISTER :
7588                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7589                         gfp);
7590         kfree(buf);
7591
7592         if (!report &&
7593             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7594                 return;
7595
7596         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7597         if (skb == NULL)
7598                 goto err;
7599
7600         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7601                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7602                                       family, table, obj, false);
7603         if (err < 0) {
7604                 kfree_skb(skb);
7605                 goto err;
7606         }
7607
7608         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7609         return;
7610 err:
7611         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7612 }
7613 EXPORT_SYMBOL_GPL(nft_obj_notify);
7614
7615 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7616                                  struct nft_object *obj, int event)
7617 {
7618         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7619                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7620 }
7621
7622 /*
7623  * Flow tables
7624  */
7625 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7626 {
7627         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7628         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7629         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7630 }
7631 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7632
7633 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7634 {
7635         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7636         list_del_rcu(&type->list);
7637         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7638 }
7639 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7640
7641 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7642         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7643                                             .len = NFT_NAME_MAXLEN - 1 },
7644         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7645                                             .len = NFT_NAME_MAXLEN - 1 },
7646         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7647         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7648         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7649 };
7650
7651 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7652                                            const struct nlattr *nla, u8 genmask)
7653 {
7654         struct nft_flowtable *flowtable;
7655
7656         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7657                 if (!nla_strcmp(nla, flowtable->name) &&
7658                     nft_active_genmask(flowtable, genmask))
7659                         return flowtable;
7660         }
7661         return ERR_PTR(-ENOENT);
7662 }
7663 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7664
7665 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7666                                     struct nft_flowtable *flowtable,
7667                                     enum nft_trans_phase phase)
7668 {
7669         switch (phase) {
7670         case NFT_TRANS_PREPARE:
7671         case NFT_TRANS_ABORT:
7672         case NFT_TRANS_RELEASE:
7673                 flowtable->use--;
7674                 fallthrough;
7675         default:
7676                 return;
7677         }
7678 }
7679 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7680
7681 static struct nft_flowtable *
7682 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7683                               const struct nlattr *nla, u8 genmask)
7684 {
7685        struct nft_flowtable *flowtable;
7686
7687        list_for_each_entry(flowtable, &table->flowtables, list) {
7688                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7689                    nft_active_genmask(flowtable, genmask))
7690                        return flowtable;
7691        }
7692        return ERR_PTR(-ENOENT);
7693 }
7694
7695 struct nft_flowtable_hook {
7696         u32                     num;
7697         int                     priority;
7698         struct list_head        list;
7699 };
7700
7701 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7702         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7703         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7704         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7705 };
7706
7707 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7708                                     const struct nlattr * const nla[],
7709                                     struct nft_flowtable_hook *flowtable_hook,
7710                                     struct nft_flowtable *flowtable,
7711                                     struct netlink_ext_ack *extack, bool add)
7712 {
7713         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7714         struct nft_hook *hook;
7715         int hooknum, priority;
7716         int err;
7717
7718         INIT_LIST_HEAD(&flowtable_hook->list);
7719
7720         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
7721                                           nla[NFTA_FLOWTABLE_HOOK],
7722                                           nft_flowtable_hook_policy, NULL);
7723         if (err < 0)
7724                 return err;
7725
7726         if (add) {
7727                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7728                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7729                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7730                         return -ENOENT;
7731                 }
7732
7733                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7734                 if (hooknum != NF_NETDEV_INGRESS)
7735                         return -EOPNOTSUPP;
7736
7737                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7738
7739                 flowtable_hook->priority        = priority;
7740                 flowtable_hook->num             = hooknum;
7741         } else {
7742                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7743                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7744                         if (hooknum != flowtable->hooknum)
7745                                 return -EOPNOTSUPP;
7746                 }
7747
7748                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7749                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7750                         if (priority != flowtable->data.priority)
7751                                 return -EOPNOTSUPP;
7752                 }
7753
7754                 flowtable_hook->priority        = flowtable->data.priority;
7755                 flowtable_hook->num             = flowtable->hooknum;
7756         }
7757
7758         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7759                 err = nf_tables_parse_netdev_hooks(ctx->net,
7760                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7761                                                    &flowtable_hook->list,
7762                                                    extack);
7763                 if (err < 0)
7764                         return err;
7765         }
7766
7767         list_for_each_entry(hook, &flowtable_hook->list, list) {
7768                 hook->ops.pf            = NFPROTO_NETDEV;
7769                 hook->ops.hooknum       = flowtable_hook->num;
7770                 hook->ops.priority      = flowtable_hook->priority;
7771                 hook->ops.priv          = &flowtable->data;
7772                 hook->ops.hook          = flowtable->data.type->hook;
7773         }
7774
7775         return err;
7776 }
7777
7778 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7779 {
7780         const struct nf_flowtable_type *type;
7781
7782         list_for_each_entry(type, &nf_tables_flowtables, list) {
7783                 if (family == type->family)
7784                         return type;
7785         }
7786         return NULL;
7787 }
7788
7789 static const struct nf_flowtable_type *
7790 nft_flowtable_type_get(struct net *net, u8 family)
7791 {
7792         const struct nf_flowtable_type *type;
7793
7794         type = __nft_flowtable_type_get(family);
7795         if (type != NULL && try_module_get(type->owner))
7796                 return type;
7797
7798         lockdep_nfnl_nft_mutex_not_held();
7799 #ifdef CONFIG_MODULES
7800         if (type == NULL) {
7801                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7802                         return ERR_PTR(-EAGAIN);
7803         }
7804 #endif
7805         return ERR_PTR(-ENOENT);
7806 }
7807
7808 /* Only called from error and netdev event paths. */
7809 static void nft_unregister_flowtable_hook(struct net *net,
7810                                           struct nft_flowtable *flowtable,
7811                                           struct nft_hook *hook)
7812 {
7813         nf_unregister_net_hook(net, &hook->ops);
7814         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7815                                     FLOW_BLOCK_UNBIND);
7816 }
7817
7818 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7819                                                  struct list_head *hook_list,
7820                                                  bool release_netdev)
7821 {
7822         struct nft_hook *hook, *next;
7823
7824         list_for_each_entry_safe(hook, next, hook_list, list) {
7825                 nf_unregister_net_hook(net, &hook->ops);
7826                 if (release_netdev) {
7827                         list_del(&hook->list);
7828                         kfree_rcu(hook, rcu);
7829                 }
7830         }
7831 }
7832
7833 static void nft_unregister_flowtable_net_hooks(struct net *net,
7834                                                struct list_head *hook_list)
7835 {
7836         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7837 }
7838
7839 static int nft_register_flowtable_net_hooks(struct net *net,
7840                                             struct nft_table *table,
7841                                             struct list_head *hook_list,
7842                                             struct nft_flowtable *flowtable)
7843 {
7844         struct nft_hook *hook, *hook2, *next;
7845         struct nft_flowtable *ft;
7846         int err, i = 0;
7847
7848         list_for_each_entry(hook, hook_list, list) {
7849                 list_for_each_entry(ft, &table->flowtables, list) {
7850                         if (!nft_is_active_next(net, ft))
7851                                 continue;
7852
7853                         list_for_each_entry(hook2, &ft->hook_list, list) {
7854                                 if (hook->ops.dev == hook2->ops.dev &&
7855                                     hook->ops.pf == hook2->ops.pf) {
7856                                         err = -EEXIST;
7857                                         goto err_unregister_net_hooks;
7858                                 }
7859                         }
7860                 }
7861
7862                 err = flowtable->data.type->setup(&flowtable->data,
7863                                                   hook->ops.dev,
7864                                                   FLOW_BLOCK_BIND);
7865                 if (err < 0)
7866                         goto err_unregister_net_hooks;
7867
7868                 err = nf_register_net_hook(net, &hook->ops);
7869                 if (err < 0) {
7870                         flowtable->data.type->setup(&flowtable->data,
7871                                                     hook->ops.dev,
7872                                                     FLOW_BLOCK_UNBIND);
7873                         goto err_unregister_net_hooks;
7874                 }
7875
7876                 i++;
7877         }
7878
7879         return 0;
7880
7881 err_unregister_net_hooks:
7882         list_for_each_entry_safe(hook, next, hook_list, list) {
7883                 if (i-- <= 0)
7884                         break;
7885
7886                 nft_unregister_flowtable_hook(net, flowtable, hook);
7887                 list_del_rcu(&hook->list);
7888                 kfree_rcu(hook, rcu);
7889         }
7890
7891         return err;
7892 }
7893
7894 static void nft_hooks_destroy(struct list_head *hook_list)
7895 {
7896         struct nft_hook *hook, *next;
7897
7898         list_for_each_entry_safe(hook, next, hook_list, list) {
7899                 list_del_rcu(&hook->list);
7900                 kfree_rcu(hook, rcu);
7901         }
7902 }
7903
7904 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7905                                 struct nft_flowtable *flowtable,
7906                                 struct netlink_ext_ack *extack)
7907 {
7908         const struct nlattr * const *nla = ctx->nla;
7909         struct nft_flowtable_hook flowtable_hook;
7910         struct nft_hook *hook, *next;
7911         struct nft_trans *trans;
7912         bool unregister = false;
7913         u32 flags;
7914         int err;
7915
7916         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
7917                                        extack, false);
7918         if (err < 0)
7919                 return err;
7920
7921         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7922                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7923                         list_del(&hook->list);
7924                         kfree(hook);
7925                 }
7926         }
7927
7928         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7929                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7930                 if (flags & ~NFT_FLOWTABLE_MASK) {
7931                         err = -EOPNOTSUPP;
7932                         goto err_flowtable_update_hook;
7933                 }
7934                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7935                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7936                         err = -EOPNOTSUPP;
7937                         goto err_flowtable_update_hook;
7938                 }
7939         } else {
7940                 flags = flowtable->data.flags;
7941         }
7942
7943         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7944                                                &flowtable_hook.list, flowtable);
7945         if (err < 0)
7946                 goto err_flowtable_update_hook;
7947
7948         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7949                                 sizeof(struct nft_trans_flowtable));
7950         if (!trans) {
7951                 unregister = true;
7952                 err = -ENOMEM;
7953                 goto err_flowtable_update_hook;
7954         }
7955
7956         nft_trans_flowtable_flags(trans) = flags;
7957         nft_trans_flowtable(trans) = flowtable;
7958         nft_trans_flowtable_update(trans) = true;
7959         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7960         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7961
7962         nft_trans_commit_list_add_tail(ctx->net, trans);
7963
7964         return 0;
7965
7966 err_flowtable_update_hook:
7967         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7968                 if (unregister)
7969                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7970                 list_del_rcu(&hook->list);
7971                 kfree_rcu(hook, rcu);
7972         }
7973
7974         return err;
7975
7976 }
7977
7978 static int nf_tables_newflowtable(struct sk_buff *skb,
7979                                   const struct nfnl_info *info,
7980                                   const struct nlattr * const nla[])
7981 {
7982         struct netlink_ext_ack *extack = info->extack;
7983         struct nft_flowtable_hook flowtable_hook;
7984         u8 genmask = nft_genmask_next(info->net);
7985         u8 family = info->nfmsg->nfgen_family;
7986         const struct nf_flowtable_type *type;
7987         struct nft_flowtable *flowtable;
7988         struct nft_hook *hook, *next;
7989         struct net *net = info->net;
7990         struct nft_table *table;
7991         struct nft_ctx ctx;
7992         int err;
7993
7994         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7995             !nla[NFTA_FLOWTABLE_NAME] ||
7996             !nla[NFTA_FLOWTABLE_HOOK])
7997                 return -EINVAL;
7998
7999         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8000                                  genmask, NETLINK_CB(skb).portid);
8001         if (IS_ERR(table)) {
8002                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8003                 return PTR_ERR(table);
8004         }
8005
8006         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8007                                          genmask);
8008         if (IS_ERR(flowtable)) {
8009                 err = PTR_ERR(flowtable);
8010                 if (err != -ENOENT) {
8011                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8012                         return err;
8013                 }
8014         } else {
8015                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8016                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8017                         return -EEXIST;
8018                 }
8019
8020                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8021
8022                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8023         }
8024
8025         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8026
8027         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8028         if (!flowtable)
8029                 return -ENOMEM;
8030
8031         flowtable->table = table;
8032         flowtable->handle = nf_tables_alloc_handle(table);
8033         INIT_LIST_HEAD(&flowtable->hook_list);
8034
8035         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8036         if (!flowtable->name) {
8037                 err = -ENOMEM;
8038                 goto err1;
8039         }
8040
8041         type = nft_flowtable_type_get(net, family);
8042         if (IS_ERR(type)) {
8043                 err = PTR_ERR(type);
8044                 goto err2;
8045         }
8046
8047         if (nla[NFTA_FLOWTABLE_FLAGS]) {
8048                 flowtable->data.flags =
8049                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8050                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8051                         err = -EOPNOTSUPP;
8052                         goto err3;
8053                 }
8054         }
8055
8056         write_pnet(&flowtable->data.net, net);
8057         flowtable->data.type = type;
8058         err = type->init(&flowtable->data);
8059         if (err < 0)
8060                 goto err3;
8061
8062         err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8063                                        extack, true);
8064         if (err < 0)
8065                 goto err4;
8066
8067         list_splice(&flowtable_hook.list, &flowtable->hook_list);
8068         flowtable->data.priority = flowtable_hook.priority;
8069         flowtable->hooknum = flowtable_hook.num;
8070
8071         err = nft_register_flowtable_net_hooks(ctx.net, table,
8072                                                &flowtable->hook_list,
8073                                                flowtable);
8074         if (err < 0) {
8075                 nft_hooks_destroy(&flowtable->hook_list);
8076                 goto err4;
8077         }
8078
8079         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8080         if (err < 0)
8081                 goto err5;
8082
8083         list_add_tail_rcu(&flowtable->list, &table->flowtables);
8084         table->use++;
8085
8086         return 0;
8087 err5:
8088         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8089                 nft_unregister_flowtable_hook(net, flowtable, hook);
8090                 list_del_rcu(&hook->list);
8091                 kfree_rcu(hook, rcu);
8092         }
8093 err4:
8094         flowtable->data.type->free(&flowtable->data);
8095 err3:
8096         module_put(type->owner);
8097 err2:
8098         kfree(flowtable->name);
8099 err1:
8100         kfree(flowtable);
8101         return err;
8102 }
8103
8104 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8105 {
8106         struct nft_hook *this, *next;
8107
8108         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8109                 list_del(&this->list);
8110                 kfree(this);
8111         }
8112 }
8113
8114 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8115                                  struct nft_flowtable *flowtable,
8116                                  struct netlink_ext_ack *extack)
8117 {
8118         const struct nlattr * const *nla = ctx->nla;
8119         struct nft_flowtable_hook flowtable_hook;
8120         LIST_HEAD(flowtable_del_list);
8121         struct nft_hook *this, *hook;
8122         struct nft_trans *trans;
8123         int err;
8124
8125         err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8126                                        extack, false);
8127         if (err < 0)
8128                 return err;
8129
8130         list_for_each_entry(this, &flowtable_hook.list, list) {
8131                 hook = nft_hook_list_find(&flowtable->hook_list, this);
8132                 if (!hook) {
8133                         err = -ENOENT;
8134                         goto err_flowtable_del_hook;
8135                 }
8136                 list_move(&hook->list, &flowtable_del_list);
8137         }
8138
8139         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8140                                 sizeof(struct nft_trans_flowtable));
8141         if (!trans) {
8142                 err = -ENOMEM;
8143                 goto err_flowtable_del_hook;
8144         }
8145
8146         nft_trans_flowtable(trans) = flowtable;
8147         nft_trans_flowtable_update(trans) = true;
8148         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8149         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8150         nft_flowtable_hook_release(&flowtable_hook);
8151
8152         nft_trans_commit_list_add_tail(ctx->net, trans);
8153
8154         return 0;
8155
8156 err_flowtable_del_hook:
8157         list_splice(&flowtable_del_list, &flowtable->hook_list);
8158         nft_flowtable_hook_release(&flowtable_hook);
8159
8160         return err;
8161 }
8162
8163 static int nf_tables_delflowtable(struct sk_buff *skb,
8164                                   const struct nfnl_info *info,
8165                                   const struct nlattr * const nla[])
8166 {
8167         struct netlink_ext_ack *extack = info->extack;
8168         u8 genmask = nft_genmask_next(info->net);
8169         u8 family = info->nfmsg->nfgen_family;
8170         struct nft_flowtable *flowtable;
8171         struct net *net = info->net;
8172         const struct nlattr *attr;
8173         struct nft_table *table;
8174         struct nft_ctx ctx;
8175
8176         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8177             (!nla[NFTA_FLOWTABLE_NAME] &&
8178              !nla[NFTA_FLOWTABLE_HANDLE]))
8179                 return -EINVAL;
8180
8181         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8182                                  genmask, NETLINK_CB(skb).portid);
8183         if (IS_ERR(table)) {
8184                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8185                 return PTR_ERR(table);
8186         }
8187
8188         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8189                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8190                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8191         } else {
8192                 attr = nla[NFTA_FLOWTABLE_NAME];
8193                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8194         }
8195
8196         if (IS_ERR(flowtable)) {
8197                 if (PTR_ERR(flowtable) == -ENOENT &&
8198                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8199                         return 0;
8200
8201                 NL_SET_BAD_ATTR(extack, attr);
8202                 return PTR_ERR(flowtable);
8203         }
8204
8205         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8206
8207         if (nla[NFTA_FLOWTABLE_HOOK])
8208                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8209
8210         if (flowtable->use > 0) {
8211                 NL_SET_BAD_ATTR(extack, attr);
8212                 return -EBUSY;
8213         }
8214
8215         return nft_delflowtable(&ctx, flowtable);
8216 }
8217
8218 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8219                                          u32 portid, u32 seq, int event,
8220                                          u32 flags, int family,
8221                                          struct nft_flowtable *flowtable,
8222                                          struct list_head *hook_list)
8223 {
8224         struct nlattr *nest, *nest_devs;
8225         struct nft_hook *hook;
8226         struct nlmsghdr *nlh;
8227
8228         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8229         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8230                            NFNETLINK_V0, nft_base_seq(net));
8231         if (!nlh)
8232                 goto nla_put_failure;
8233
8234         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8235             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8236             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8237                          NFTA_FLOWTABLE_PAD))
8238                 goto nla_put_failure;
8239
8240         if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8241                 nlmsg_end(skb, nlh);
8242                 return 0;
8243         }
8244
8245         if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8246             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8247                 goto nla_put_failure;
8248
8249         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8250         if (!nest)
8251                 goto nla_put_failure;
8252         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8253             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8254                 goto nla_put_failure;
8255
8256         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8257         if (!nest_devs)
8258                 goto nla_put_failure;
8259
8260         if (!hook_list)
8261                 hook_list = &flowtable->hook_list;
8262
8263         list_for_each_entry_rcu(hook, hook_list, list) {
8264                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8265                         goto nla_put_failure;
8266         }
8267         nla_nest_end(skb, nest_devs);
8268         nla_nest_end(skb, nest);
8269
8270         nlmsg_end(skb, nlh);
8271         return 0;
8272
8273 nla_put_failure:
8274         nlmsg_trim(skb, nlh);
8275         return -1;
8276 }
8277
8278 struct nft_flowtable_filter {
8279         char            *table;
8280 };
8281
8282 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8283                                     struct netlink_callback *cb)
8284 {
8285         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8286         struct nft_flowtable_filter *filter = cb->data;
8287         unsigned int idx = 0, s_idx = cb->args[0];
8288         struct net *net = sock_net(skb->sk);
8289         int family = nfmsg->nfgen_family;
8290         struct nft_flowtable *flowtable;
8291         struct nftables_pernet *nft_net;
8292         const struct nft_table *table;
8293
8294         rcu_read_lock();
8295         nft_net = nft_pernet(net);
8296         cb->seq = READ_ONCE(nft_net->base_seq);
8297
8298         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8299                 if (family != NFPROTO_UNSPEC && family != table->family)
8300                         continue;
8301
8302                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8303                         if (!nft_is_active(net, flowtable))
8304                                 goto cont;
8305                         if (idx < s_idx)
8306                                 goto cont;
8307                         if (idx > s_idx)
8308                                 memset(&cb->args[1], 0,
8309                                        sizeof(cb->args) - sizeof(cb->args[0]));
8310                         if (filter && filter->table &&
8311                             strcmp(filter->table, table->name))
8312                                 goto cont;
8313
8314                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8315                                                           cb->nlh->nlmsg_seq,
8316                                                           NFT_MSG_NEWFLOWTABLE,
8317                                                           NLM_F_MULTI | NLM_F_APPEND,
8318                                                           table->family,
8319                                                           flowtable, NULL) < 0)
8320                                 goto done;
8321
8322                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8323 cont:
8324                         idx++;
8325                 }
8326         }
8327 done:
8328         rcu_read_unlock();
8329
8330         cb->args[0] = idx;
8331         return skb->len;
8332 }
8333
8334 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8335 {
8336         const struct nlattr * const *nla = cb->data;
8337         struct nft_flowtable_filter *filter = NULL;
8338
8339         if (nla[NFTA_FLOWTABLE_TABLE]) {
8340                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8341                 if (!filter)
8342                         return -ENOMEM;
8343
8344                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8345                                            GFP_ATOMIC);
8346                 if (!filter->table) {
8347                         kfree(filter);
8348                         return -ENOMEM;
8349                 }
8350         }
8351
8352         cb->data = filter;
8353         return 0;
8354 }
8355
8356 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8357 {
8358         struct nft_flowtable_filter *filter = cb->data;
8359
8360         if (!filter)
8361                 return 0;
8362
8363         kfree(filter->table);
8364         kfree(filter);
8365
8366         return 0;
8367 }
8368
8369 /* called with rcu_read_lock held */
8370 static int nf_tables_getflowtable(struct sk_buff *skb,
8371                                   const struct nfnl_info *info,
8372                                   const struct nlattr * const nla[])
8373 {
8374         u8 genmask = nft_genmask_cur(info->net);
8375         u8 family = info->nfmsg->nfgen_family;
8376         struct nft_flowtable *flowtable;
8377         const struct nft_table *table;
8378         struct net *net = info->net;
8379         struct sk_buff *skb2;
8380         int err;
8381
8382         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8383                 struct netlink_dump_control c = {
8384                         .start = nf_tables_dump_flowtable_start,
8385                         .dump = nf_tables_dump_flowtable,
8386                         .done = nf_tables_dump_flowtable_done,
8387                         .module = THIS_MODULE,
8388                         .data = (void *)nla,
8389                 };
8390
8391                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8392         }
8393
8394         if (!nla[NFTA_FLOWTABLE_NAME])
8395                 return -EINVAL;
8396
8397         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8398                                  genmask, 0);
8399         if (IS_ERR(table))
8400                 return PTR_ERR(table);
8401
8402         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8403                                          genmask);
8404         if (IS_ERR(flowtable))
8405                 return PTR_ERR(flowtable);
8406
8407         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8408         if (!skb2)
8409                 return -ENOMEM;
8410
8411         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8412                                             info->nlh->nlmsg_seq,
8413                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8414                                             flowtable, NULL);
8415         if (err < 0)
8416                 goto err_fill_flowtable_info;
8417
8418         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8419
8420 err_fill_flowtable_info:
8421         kfree_skb(skb2);
8422         return err;
8423 }
8424
8425 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8426                                        struct nft_flowtable *flowtable,
8427                                        struct list_head *hook_list, int event)
8428 {
8429         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8430         struct sk_buff *skb;
8431         u16 flags = 0;
8432         int err;
8433
8434         if (!ctx->report &&
8435             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8436                 return;
8437
8438         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8439         if (skb == NULL)
8440                 goto err;
8441
8442         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8443                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8444
8445         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8446                                             ctx->seq, event, flags,
8447                                             ctx->family, flowtable, hook_list);
8448         if (err < 0) {
8449                 kfree_skb(skb);
8450                 goto err;
8451         }
8452
8453         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8454         return;
8455 err:
8456         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8457 }
8458
8459 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8460 {
8461         struct nft_hook *hook, *next;
8462
8463         flowtable->data.type->free(&flowtable->data);
8464         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8465                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8466                                             FLOW_BLOCK_UNBIND);
8467                 list_del_rcu(&hook->list);
8468                 kfree(hook);
8469         }
8470         kfree(flowtable->name);
8471         module_put(flowtable->data.type->owner);
8472         kfree(flowtable);
8473 }
8474
8475 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8476                                    u32 portid, u32 seq)
8477 {
8478         struct nftables_pernet *nft_net = nft_pernet(net);
8479         struct nlmsghdr *nlh;
8480         char buf[TASK_COMM_LEN];
8481         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8482
8483         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8484                            NFNETLINK_V0, nft_base_seq(net));
8485         if (!nlh)
8486                 goto nla_put_failure;
8487
8488         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8489             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8490             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8491                 goto nla_put_failure;
8492
8493         nlmsg_end(skb, nlh);
8494         return 0;
8495
8496 nla_put_failure:
8497         nlmsg_trim(skb, nlh);
8498         return -EMSGSIZE;
8499 }
8500
8501 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8502                                 struct nft_flowtable *flowtable)
8503 {
8504         struct nft_hook *hook;
8505
8506         list_for_each_entry(hook, &flowtable->hook_list, list) {
8507                 if (hook->ops.dev != dev)
8508                         continue;
8509
8510                 /* flow_offload_netdev_event() cleans up entries for us. */
8511                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8512                 list_del_rcu(&hook->list);
8513                 kfree_rcu(hook, rcu);
8514                 break;
8515         }
8516 }
8517
8518 static int nf_tables_flowtable_event(struct notifier_block *this,
8519                                      unsigned long event, void *ptr)
8520 {
8521         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8522         struct nft_flowtable *flowtable;
8523         struct nftables_pernet *nft_net;
8524         struct nft_table *table;
8525         struct net *net;
8526
8527         if (event != NETDEV_UNREGISTER)
8528                 return 0;
8529
8530         net = dev_net(dev);
8531         nft_net = nft_pernet(net);
8532         mutex_lock(&nft_net->commit_mutex);
8533         list_for_each_entry(table, &nft_net->tables, list) {
8534                 list_for_each_entry(flowtable, &table->flowtables, list) {
8535                         nft_flowtable_event(event, dev, flowtable);
8536                 }
8537         }
8538         mutex_unlock(&nft_net->commit_mutex);
8539
8540         return NOTIFY_DONE;
8541 }
8542
8543 static struct notifier_block nf_tables_flowtable_notifier = {
8544         .notifier_call  = nf_tables_flowtable_event,
8545 };
8546
8547 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8548                                  int event)
8549 {
8550         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8551         struct sk_buff *skb2;
8552         int err;
8553
8554         if (!nlmsg_report(nlh) &&
8555             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8556                 return;
8557
8558         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8559         if (skb2 == NULL)
8560                 goto err;
8561
8562         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8563                                       nlh->nlmsg_seq);
8564         if (err < 0) {
8565                 kfree_skb(skb2);
8566                 goto err;
8567         }
8568
8569         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8570                        nlmsg_report(nlh), GFP_KERNEL);
8571         return;
8572 err:
8573         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8574                           -ENOBUFS);
8575 }
8576
8577 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8578                             const struct nlattr * const nla[])
8579 {
8580         struct sk_buff *skb2;
8581         int err;
8582
8583         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8584         if (skb2 == NULL)
8585                 return -ENOMEM;
8586
8587         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8588                                       info->nlh->nlmsg_seq);
8589         if (err < 0)
8590                 goto err_fill_gen_info;
8591
8592         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8593
8594 err_fill_gen_info:
8595         kfree_skb(skb2);
8596         return err;
8597 }
8598
8599 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8600         [NFT_MSG_NEWTABLE] = {
8601                 .call           = nf_tables_newtable,
8602                 .type           = NFNL_CB_BATCH,
8603                 .attr_count     = NFTA_TABLE_MAX,
8604                 .policy         = nft_table_policy,
8605         },
8606         [NFT_MSG_GETTABLE] = {
8607                 .call           = nf_tables_gettable,
8608                 .type           = NFNL_CB_RCU,
8609                 .attr_count     = NFTA_TABLE_MAX,
8610                 .policy         = nft_table_policy,
8611         },
8612         [NFT_MSG_DELTABLE] = {
8613                 .call           = nf_tables_deltable,
8614                 .type           = NFNL_CB_BATCH,
8615                 .attr_count     = NFTA_TABLE_MAX,
8616                 .policy         = nft_table_policy,
8617         },
8618         [NFT_MSG_DESTROYTABLE] = {
8619                 .call           = nf_tables_deltable,
8620                 .type           = NFNL_CB_BATCH,
8621                 .attr_count     = NFTA_TABLE_MAX,
8622                 .policy         = nft_table_policy,
8623         },
8624         [NFT_MSG_NEWCHAIN] = {
8625                 .call           = nf_tables_newchain,
8626                 .type           = NFNL_CB_BATCH,
8627                 .attr_count     = NFTA_CHAIN_MAX,
8628                 .policy         = nft_chain_policy,
8629         },
8630         [NFT_MSG_GETCHAIN] = {
8631                 .call           = nf_tables_getchain,
8632                 .type           = NFNL_CB_RCU,
8633                 .attr_count     = NFTA_CHAIN_MAX,
8634                 .policy         = nft_chain_policy,
8635         },
8636         [NFT_MSG_DELCHAIN] = {
8637                 .call           = nf_tables_delchain,
8638                 .type           = NFNL_CB_BATCH,
8639                 .attr_count     = NFTA_CHAIN_MAX,
8640                 .policy         = nft_chain_policy,
8641         },
8642         [NFT_MSG_DESTROYCHAIN] = {
8643                 .call           = nf_tables_delchain,
8644                 .type           = NFNL_CB_BATCH,
8645                 .attr_count     = NFTA_CHAIN_MAX,
8646                 .policy         = nft_chain_policy,
8647         },
8648         [NFT_MSG_NEWRULE] = {
8649                 .call           = nf_tables_newrule,
8650                 .type           = NFNL_CB_BATCH,
8651                 .attr_count     = NFTA_RULE_MAX,
8652                 .policy         = nft_rule_policy,
8653         },
8654         [NFT_MSG_GETRULE] = {
8655                 .call           = nf_tables_getrule,
8656                 .type           = NFNL_CB_RCU,
8657                 .attr_count     = NFTA_RULE_MAX,
8658                 .policy         = nft_rule_policy,
8659         },
8660         [NFT_MSG_GETRULE_RESET] = {
8661                 .call           = nf_tables_getrule,
8662                 .type           = NFNL_CB_RCU,
8663                 .attr_count     = NFTA_RULE_MAX,
8664                 .policy         = nft_rule_policy,
8665         },
8666         [NFT_MSG_DELRULE] = {
8667                 .call           = nf_tables_delrule,
8668                 .type           = NFNL_CB_BATCH,
8669                 .attr_count     = NFTA_RULE_MAX,
8670                 .policy         = nft_rule_policy,
8671         },
8672         [NFT_MSG_DESTROYRULE] = {
8673                 .call           = nf_tables_delrule,
8674                 .type           = NFNL_CB_BATCH,
8675                 .attr_count     = NFTA_RULE_MAX,
8676                 .policy         = nft_rule_policy,
8677         },
8678         [NFT_MSG_NEWSET] = {
8679                 .call           = nf_tables_newset,
8680                 .type           = NFNL_CB_BATCH,
8681                 .attr_count     = NFTA_SET_MAX,
8682                 .policy         = nft_set_policy,
8683         },
8684         [NFT_MSG_GETSET] = {
8685                 .call           = nf_tables_getset,
8686                 .type           = NFNL_CB_RCU,
8687                 .attr_count     = NFTA_SET_MAX,
8688                 .policy         = nft_set_policy,
8689         },
8690         [NFT_MSG_DELSET] = {
8691                 .call           = nf_tables_delset,
8692                 .type           = NFNL_CB_BATCH,
8693                 .attr_count     = NFTA_SET_MAX,
8694                 .policy         = nft_set_policy,
8695         },
8696         [NFT_MSG_DESTROYSET] = {
8697                 .call           = nf_tables_delset,
8698                 .type           = NFNL_CB_BATCH,
8699                 .attr_count     = NFTA_SET_MAX,
8700                 .policy         = nft_set_policy,
8701         },
8702         [NFT_MSG_NEWSETELEM] = {
8703                 .call           = nf_tables_newsetelem,
8704                 .type           = NFNL_CB_BATCH,
8705                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8706                 .policy         = nft_set_elem_list_policy,
8707         },
8708         [NFT_MSG_GETSETELEM] = {
8709                 .call           = nf_tables_getsetelem,
8710                 .type           = NFNL_CB_RCU,
8711                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8712                 .policy         = nft_set_elem_list_policy,
8713         },
8714         [NFT_MSG_DELSETELEM] = {
8715                 .call           = nf_tables_delsetelem,
8716                 .type           = NFNL_CB_BATCH,
8717                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8718                 .policy         = nft_set_elem_list_policy,
8719         },
8720         [NFT_MSG_DESTROYSETELEM] = {
8721                 .call           = nf_tables_delsetelem,
8722                 .type           = NFNL_CB_BATCH,
8723                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8724                 .policy         = nft_set_elem_list_policy,
8725         },
8726         [NFT_MSG_GETGEN] = {
8727                 .call           = nf_tables_getgen,
8728                 .type           = NFNL_CB_RCU,
8729         },
8730         [NFT_MSG_NEWOBJ] = {
8731                 .call           = nf_tables_newobj,
8732                 .type           = NFNL_CB_BATCH,
8733                 .attr_count     = NFTA_OBJ_MAX,
8734                 .policy         = nft_obj_policy,
8735         },
8736         [NFT_MSG_GETOBJ] = {
8737                 .call           = nf_tables_getobj,
8738                 .type           = NFNL_CB_RCU,
8739                 .attr_count     = NFTA_OBJ_MAX,
8740                 .policy         = nft_obj_policy,
8741         },
8742         [NFT_MSG_DELOBJ] = {
8743                 .call           = nf_tables_delobj,
8744                 .type           = NFNL_CB_BATCH,
8745                 .attr_count     = NFTA_OBJ_MAX,
8746                 .policy         = nft_obj_policy,
8747         },
8748         [NFT_MSG_DESTROYOBJ] = {
8749                 .call           = nf_tables_delobj,
8750                 .type           = NFNL_CB_BATCH,
8751                 .attr_count     = NFTA_OBJ_MAX,
8752                 .policy         = nft_obj_policy,
8753         },
8754         [NFT_MSG_GETOBJ_RESET] = {
8755                 .call           = nf_tables_getobj,
8756                 .type           = NFNL_CB_RCU,
8757                 .attr_count     = NFTA_OBJ_MAX,
8758                 .policy         = nft_obj_policy,
8759         },
8760         [NFT_MSG_NEWFLOWTABLE] = {
8761                 .call           = nf_tables_newflowtable,
8762                 .type           = NFNL_CB_BATCH,
8763                 .attr_count     = NFTA_FLOWTABLE_MAX,
8764                 .policy         = nft_flowtable_policy,
8765         },
8766         [NFT_MSG_GETFLOWTABLE] = {
8767                 .call           = nf_tables_getflowtable,
8768                 .type           = NFNL_CB_RCU,
8769                 .attr_count     = NFTA_FLOWTABLE_MAX,
8770                 .policy         = nft_flowtable_policy,
8771         },
8772         [NFT_MSG_DELFLOWTABLE] = {
8773                 .call           = nf_tables_delflowtable,
8774                 .type           = NFNL_CB_BATCH,
8775                 .attr_count     = NFTA_FLOWTABLE_MAX,
8776                 .policy         = nft_flowtable_policy,
8777         },
8778         [NFT_MSG_DESTROYFLOWTABLE] = {
8779                 .call           = nf_tables_delflowtable,
8780                 .type           = NFNL_CB_BATCH,
8781                 .attr_count     = NFTA_FLOWTABLE_MAX,
8782                 .policy         = nft_flowtable_policy,
8783         },
8784 };
8785
8786 static int nf_tables_validate(struct net *net)
8787 {
8788         struct nftables_pernet *nft_net = nft_pernet(net);
8789         struct nft_table *table;
8790
8791         list_for_each_entry(table, &nft_net->tables, list) {
8792                 switch (table->validate_state) {
8793                 case NFT_VALIDATE_SKIP:
8794                         continue;
8795                 case NFT_VALIDATE_NEED:
8796                         nft_validate_state_update(table, NFT_VALIDATE_DO);
8797                         fallthrough;
8798                 case NFT_VALIDATE_DO:
8799                         if (nft_table_validate(net, table) < 0)
8800                                 return -EAGAIN;
8801
8802                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
8803                 }
8804
8805                 break;
8806         }
8807
8808         return 0;
8809 }
8810
8811 /* a drop policy has to be deferred until all rules have been activated,
8812  * otherwise a large ruleset that contains a drop-policy base chain will
8813  * cause all packets to get dropped until the full transaction has been
8814  * processed.
8815  *
8816  * We defer the drop policy until the transaction has been finalized.
8817  */
8818 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8819 {
8820         struct nft_base_chain *basechain;
8821
8822         if (nft_trans_chain_policy(trans) != NF_DROP)
8823                 return;
8824
8825         if (!nft_is_base_chain(trans->ctx.chain))
8826                 return;
8827
8828         basechain = nft_base_chain(trans->ctx.chain);
8829         basechain->policy = NF_DROP;
8830 }
8831
8832 static void nft_chain_commit_update(struct nft_trans *trans)
8833 {
8834         struct nft_base_chain *basechain;
8835
8836         if (nft_trans_chain_name(trans)) {
8837                 rhltable_remove(&trans->ctx.table->chains_ht,
8838                                 &trans->ctx.chain->rhlhead,
8839                                 nft_chain_ht_params);
8840                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8841                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8842                                     trans->ctx.chain->name,
8843                                     &trans->ctx.chain->rhlhead,
8844                                     nft_chain_ht_params);
8845         }
8846
8847         if (!nft_is_base_chain(trans->ctx.chain))
8848                 return;
8849
8850         nft_chain_stats_replace(trans);
8851
8852         basechain = nft_base_chain(trans->ctx.chain);
8853
8854         switch (nft_trans_chain_policy(trans)) {
8855         case NF_DROP:
8856         case NF_ACCEPT:
8857                 basechain->policy = nft_trans_chain_policy(trans);
8858                 break;
8859         }
8860 }
8861
8862 static void nft_obj_commit_update(struct nft_trans *trans)
8863 {
8864         struct nft_object *newobj;
8865         struct nft_object *obj;
8866
8867         obj = nft_trans_obj(trans);
8868         newobj = nft_trans_obj_newobj(trans);
8869
8870         if (obj->ops->update)
8871                 obj->ops->update(obj, newobj);
8872
8873         nft_obj_destroy(&trans->ctx, newobj);
8874 }
8875
8876 static void nft_commit_release(struct nft_trans *trans)
8877 {
8878         switch (trans->msg_type) {
8879         case NFT_MSG_DELTABLE:
8880         case NFT_MSG_DESTROYTABLE:
8881                 nf_tables_table_destroy(&trans->ctx);
8882                 break;
8883         case NFT_MSG_NEWCHAIN:
8884                 free_percpu(nft_trans_chain_stats(trans));
8885                 kfree(nft_trans_chain_name(trans));
8886                 break;
8887         case NFT_MSG_DELCHAIN:
8888         case NFT_MSG_DESTROYCHAIN:
8889                 if (nft_trans_chain_update(trans))
8890                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
8891                 else
8892                         nf_tables_chain_destroy(&trans->ctx);
8893                 break;
8894         case NFT_MSG_DELRULE:
8895         case NFT_MSG_DESTROYRULE:
8896                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8897                 break;
8898         case NFT_MSG_DELSET:
8899         case NFT_MSG_DESTROYSET:
8900                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8901                 break;
8902         case NFT_MSG_DELSETELEM:
8903         case NFT_MSG_DESTROYSETELEM:
8904                 nf_tables_set_elem_destroy(&trans->ctx,
8905                                            nft_trans_elem_set(trans),
8906                                            nft_trans_elem(trans).priv);
8907                 break;
8908         case NFT_MSG_DELOBJ:
8909         case NFT_MSG_DESTROYOBJ:
8910                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8911                 break;
8912         case NFT_MSG_DELFLOWTABLE:
8913         case NFT_MSG_DESTROYFLOWTABLE:
8914                 if (nft_trans_flowtable_update(trans))
8915                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8916                 else
8917                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8918                 break;
8919         }
8920
8921         if (trans->put_net)
8922                 put_net(trans->ctx.net);
8923
8924         kfree(trans);
8925 }
8926
8927 static void nf_tables_trans_destroy_work(struct work_struct *w)
8928 {
8929         struct nft_trans *trans, *next;
8930         LIST_HEAD(head);
8931
8932         spin_lock(&nf_tables_destroy_list_lock);
8933         list_splice_init(&nf_tables_destroy_list, &head);
8934         spin_unlock(&nf_tables_destroy_list_lock);
8935
8936         if (list_empty(&head))
8937                 return;
8938
8939         synchronize_rcu();
8940
8941         list_for_each_entry_safe(trans, next, &head, list) {
8942                 list_del(&trans->list);
8943                 nft_commit_release(trans);
8944         }
8945 }
8946
8947 void nf_tables_trans_destroy_flush_work(void)
8948 {
8949         flush_work(&trans_destroy_work);
8950 }
8951 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8952
8953 static bool nft_expr_reduce(struct nft_regs_track *track,
8954                             const struct nft_expr *expr)
8955 {
8956         return false;
8957 }
8958
8959 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8960 {
8961         const struct nft_expr *expr, *last;
8962         struct nft_regs_track track = {};
8963         unsigned int size, data_size;
8964         void *data, *data_boundary;
8965         struct nft_rule_dp *prule;
8966         struct nft_rule *rule;
8967
8968         /* already handled or inactive chain? */
8969         if (chain->blob_next || !nft_is_active_next(net, chain))
8970                 return 0;
8971
8972         data_size = 0;
8973         list_for_each_entry(rule, &chain->rules, list) {
8974                 if (nft_is_active_next(net, rule)) {
8975                         data_size += sizeof(*prule) + rule->dlen;
8976                         if (data_size > INT_MAX)
8977                                 return -ENOMEM;
8978                 }
8979         }
8980
8981         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
8982         if (!chain->blob_next)
8983                 return -ENOMEM;
8984
8985         data = (void *)chain->blob_next->data;
8986         data_boundary = data + data_size;
8987         size = 0;
8988
8989         list_for_each_entry(rule, &chain->rules, list) {
8990                 if (!nft_is_active_next(net, rule))
8991                         continue;
8992
8993                 prule = (struct nft_rule_dp *)data;
8994                 data += offsetof(struct nft_rule_dp, data);
8995                 if (WARN_ON_ONCE(data > data_boundary))
8996                         return -ENOMEM;
8997
8998                 size = 0;
8999                 track.last = nft_expr_last(rule);
9000                 nft_rule_for_each_expr(expr, last, rule) {
9001                         track.cur = expr;
9002
9003                         if (nft_expr_reduce(&track, expr)) {
9004                                 expr = track.cur;
9005                                 continue;
9006                         }
9007
9008                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
9009                                 return -ENOMEM;
9010
9011                         memcpy(data + size, expr, expr->ops->size);
9012                         size += expr->ops->size;
9013                 }
9014                 if (WARN_ON_ONCE(size >= 1 << 12))
9015                         return -ENOMEM;
9016
9017                 prule->handle = rule->handle;
9018                 prule->dlen = size;
9019                 prule->is_last = 0;
9020
9021                 data += size;
9022                 size = 0;
9023                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9024         }
9025
9026         if (WARN_ON_ONCE(data > data_boundary))
9027                 return -ENOMEM;
9028
9029         prule = (struct nft_rule_dp *)data;
9030         nft_last_rule(chain, prule);
9031
9032         return 0;
9033 }
9034
9035 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9036 {
9037         struct nftables_pernet *nft_net = nft_pernet(net);
9038         struct nft_trans *trans, *next;
9039
9040         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9041                 struct nft_chain *chain = trans->ctx.chain;
9042
9043                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9044                     trans->msg_type == NFT_MSG_DELRULE) {
9045                         kvfree(chain->blob_next);
9046                         chain->blob_next = NULL;
9047                 }
9048         }
9049 }
9050
9051 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9052 {
9053         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9054
9055         kvfree(l->blob);
9056 }
9057
9058 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9059 {
9060         struct nft_rule_dp_last *last;
9061
9062         /* last rule trailer is after end marker */
9063         last = (void *)blob + sizeof(*blob) + blob->size;
9064         last->blob = blob;
9065
9066         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9067 }
9068
9069 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9070 {
9071         struct nft_rule_blob *g0, *g1;
9072         bool next_genbit;
9073
9074         next_genbit = nft_gencursor_next(net);
9075
9076         g0 = rcu_dereference_protected(chain->blob_gen_0,
9077                                        lockdep_commit_lock_is_held(net));
9078         g1 = rcu_dereference_protected(chain->blob_gen_1,
9079                                        lockdep_commit_lock_is_held(net));
9080
9081         /* No changes to this chain? */
9082         if (chain->blob_next == NULL) {
9083                 /* chain had no change in last or next generation */
9084                 if (g0 == g1)
9085                         return;
9086                 /*
9087                  * chain had no change in this generation; make sure next
9088                  * one uses same rules as current generation.
9089                  */
9090                 if (next_genbit) {
9091                         rcu_assign_pointer(chain->blob_gen_1, g0);
9092                         nf_tables_commit_chain_free_rules_old(g1);
9093                 } else {
9094                         rcu_assign_pointer(chain->blob_gen_0, g1);
9095                         nf_tables_commit_chain_free_rules_old(g0);
9096                 }
9097
9098                 return;
9099         }
9100
9101         if (next_genbit)
9102                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9103         else
9104                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9105
9106         chain->blob_next = NULL;
9107
9108         if (g0 == g1)
9109                 return;
9110
9111         if (next_genbit)
9112                 nf_tables_commit_chain_free_rules_old(g1);
9113         else
9114                 nf_tables_commit_chain_free_rules_old(g0);
9115 }
9116
9117 static void nft_obj_del(struct nft_object *obj)
9118 {
9119         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9120         list_del_rcu(&obj->list);
9121 }
9122
9123 void nft_chain_del(struct nft_chain *chain)
9124 {
9125         struct nft_table *table = chain->table;
9126
9127         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9128                                      nft_chain_ht_params));
9129         list_del_rcu(&chain->list);
9130 }
9131
9132 static void nf_tables_module_autoload_cleanup(struct net *net)
9133 {
9134         struct nftables_pernet *nft_net = nft_pernet(net);
9135         struct nft_module_request *req, *next;
9136
9137         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9138         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9139                 WARN_ON_ONCE(!req->done);
9140                 list_del(&req->list);
9141                 kfree(req);
9142         }
9143 }
9144
9145 static void nf_tables_commit_release(struct net *net)
9146 {
9147         struct nftables_pernet *nft_net = nft_pernet(net);
9148         struct nft_trans *trans;
9149
9150         /* all side effects have to be made visible.
9151          * For example, if a chain named 'foo' has been deleted, a
9152          * new transaction must not find it anymore.
9153          *
9154          * Memory reclaim happens asynchronously from work queue
9155          * to prevent expensive synchronize_rcu() in commit phase.
9156          */
9157         if (list_empty(&nft_net->commit_list)) {
9158                 nf_tables_module_autoload_cleanup(net);
9159                 mutex_unlock(&nft_net->commit_mutex);
9160                 return;
9161         }
9162
9163         trans = list_last_entry(&nft_net->commit_list,
9164                                 struct nft_trans, list);
9165         get_net(trans->ctx.net);
9166         WARN_ON_ONCE(trans->put_net);
9167
9168         trans->put_net = true;
9169         spin_lock(&nf_tables_destroy_list_lock);
9170         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9171         spin_unlock(&nf_tables_destroy_list_lock);
9172
9173         nf_tables_module_autoload_cleanup(net);
9174         schedule_work(&trans_destroy_work);
9175
9176         mutex_unlock(&nft_net->commit_mutex);
9177 }
9178
9179 static void nft_commit_notify(struct net *net, u32 portid)
9180 {
9181         struct nftables_pernet *nft_net = nft_pernet(net);
9182         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9183         unsigned char *data;
9184         int len;
9185
9186         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9187                 if (!batch_skb) {
9188 new_batch:
9189                         batch_skb = skb;
9190                         len = NLMSG_GOODSIZE - skb->len;
9191                         list_del(&skb->list);
9192                         continue;
9193                 }
9194                 len -= skb->len;
9195                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9196                         data = skb_put(batch_skb, skb->len);
9197                         memcpy(data, skb->data, skb->len);
9198                         list_del(&skb->list);
9199                         kfree_skb(skb);
9200                         continue;
9201                 }
9202                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9203                                NFT_CB(batch_skb).report, GFP_KERNEL);
9204                 goto new_batch;
9205         }
9206
9207         if (batch_skb) {
9208                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9209                                NFT_CB(batch_skb).report, GFP_KERNEL);
9210         }
9211
9212         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9213 }
9214
9215 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9216                                         struct nft_table *table)
9217 {
9218         struct nft_audit_data *adp;
9219
9220         list_for_each_entry(adp, adl, list) {
9221                 if (adp->table == table)
9222                         return 0;
9223         }
9224         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9225         if (!adp)
9226                 return -ENOMEM;
9227         adp->table = table;
9228         list_add(&adp->list, adl);
9229         return 0;
9230 }
9231
9232 static void nf_tables_commit_audit_free(struct list_head *adl)
9233 {
9234         struct nft_audit_data *adp, *adn;
9235
9236         list_for_each_entry_safe(adp, adn, adl, list) {
9237                 list_del(&adp->list);
9238                 kfree(adp);
9239         }
9240 }
9241
9242 static void nf_tables_commit_audit_collect(struct list_head *adl,
9243                                            struct nft_table *table, u32 op)
9244 {
9245         struct nft_audit_data *adp;
9246
9247         list_for_each_entry(adp, adl, list) {
9248                 if (adp->table == table)
9249                         goto found;
9250         }
9251         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9252         return;
9253 found:
9254         adp->entries++;
9255         if (!adp->op || adp->op > op)
9256                 adp->op = op;
9257 }
9258
9259 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9260
9261 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9262 {
9263         struct nft_audit_data *adp, *adn;
9264         char aubuf[AUNFTABLENAMELEN];
9265
9266         list_for_each_entry_safe(adp, adn, adl, list) {
9267                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9268                          generation);
9269                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9270                                 nft2audit_op[adp->op], GFP_KERNEL);
9271                 list_del(&adp->list);
9272                 kfree(adp);
9273         }
9274 }
9275
9276 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9277 {
9278         struct nftables_pernet *nft_net = nft_pernet(net);
9279         struct nft_trans *trans, *next;
9280         struct nft_trans_elem *te;
9281         struct nft_chain *chain;
9282         struct nft_table *table;
9283         unsigned int base_seq;
9284         LIST_HEAD(adl);
9285         int err;
9286
9287         if (list_empty(&nft_net->commit_list)) {
9288                 mutex_unlock(&nft_net->commit_mutex);
9289                 return 0;
9290         }
9291
9292         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9293         if (nf_tables_validate(net) < 0)
9294                 return -EAGAIN;
9295
9296         err = nft_flow_rule_offload_commit(net);
9297         if (err < 0)
9298                 return err;
9299
9300         /* 1.  Allocate space for next generation rules_gen_X[] */
9301         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9302                 int ret;
9303
9304                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9305                 if (ret) {
9306                         nf_tables_commit_chain_prepare_cancel(net);
9307                         nf_tables_commit_audit_free(&adl);
9308                         return ret;
9309                 }
9310                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9311                     trans->msg_type == NFT_MSG_DELRULE) {
9312                         chain = trans->ctx.chain;
9313
9314                         ret = nf_tables_commit_chain_prepare(net, chain);
9315                         if (ret < 0) {
9316                                 nf_tables_commit_chain_prepare_cancel(net);
9317                                 nf_tables_commit_audit_free(&adl);
9318                                 return ret;
9319                         }
9320                 }
9321         }
9322
9323         /* step 2.  Make rules_gen_X visible to packet path */
9324         list_for_each_entry(table, &nft_net->tables, list) {
9325                 list_for_each_entry(chain, &table->chains, list)
9326                         nf_tables_commit_chain(net, chain);
9327         }
9328
9329         /*
9330          * Bump generation counter, invalidate any dump in progress.
9331          * Cannot fail after this point.
9332          */
9333         base_seq = READ_ONCE(nft_net->base_seq);
9334         while (++base_seq == 0)
9335                 ;
9336
9337         WRITE_ONCE(nft_net->base_seq, base_seq);
9338
9339         /* step 3. Start new generation, rules_gen_X now in use. */
9340         net->nft.gencursor = nft_gencursor_next(net);
9341
9342         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9343                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9344                                                trans->msg_type);
9345                 switch (trans->msg_type) {
9346                 case NFT_MSG_NEWTABLE:
9347                         if (nft_trans_table_update(trans)) {
9348                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9349                                         nft_trans_destroy(trans);
9350                                         break;
9351                                 }
9352                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9353                                         nf_tables_table_disable(net, trans->ctx.table);
9354
9355                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9356                         } else {
9357                                 nft_clear(net, trans->ctx.table);
9358                         }
9359                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9360                         nft_trans_destroy(trans);
9361                         break;
9362                 case NFT_MSG_DELTABLE:
9363                 case NFT_MSG_DESTROYTABLE:
9364                         list_del_rcu(&trans->ctx.table->list);
9365                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9366                         break;
9367                 case NFT_MSG_NEWCHAIN:
9368                         if (nft_trans_chain_update(trans)) {
9369                                 nft_chain_commit_update(trans);
9370                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
9371                                                        &nft_trans_chain_hooks(trans));
9372                                 list_splice(&nft_trans_chain_hooks(trans),
9373                                             &nft_trans_basechain(trans)->hook_list);
9374                                 /* trans destroyed after rcu grace period */
9375                         } else {
9376                                 nft_chain_commit_drop_policy(trans);
9377                                 nft_clear(net, trans->ctx.chain);
9378                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
9379                                 nft_trans_destroy(trans);
9380                         }
9381                         break;
9382                 case NFT_MSG_DELCHAIN:
9383                 case NFT_MSG_DESTROYCHAIN:
9384                         if (nft_trans_chain_update(trans)) {
9385                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9386                                                        &nft_trans_chain_hooks(trans));
9387                                 nft_netdev_unregister_hooks(net,
9388                                                             &nft_trans_chain_hooks(trans),
9389                                                             true);
9390                         } else {
9391                                 nft_chain_del(trans->ctx.chain);
9392                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
9393                                                        NULL);
9394                                 nf_tables_unregister_hook(trans->ctx.net,
9395                                                           trans->ctx.table,
9396                                                           trans->ctx.chain);
9397                         }
9398                         break;
9399                 case NFT_MSG_NEWRULE:
9400                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9401                         nf_tables_rule_notify(&trans->ctx,
9402                                               nft_trans_rule(trans),
9403                                               NFT_MSG_NEWRULE);
9404                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9405                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9406
9407                         nft_trans_destroy(trans);
9408                         break;
9409                 case NFT_MSG_DELRULE:
9410                 case NFT_MSG_DESTROYRULE:
9411                         list_del_rcu(&nft_trans_rule(trans)->list);
9412                         nf_tables_rule_notify(&trans->ctx,
9413                                               nft_trans_rule(trans),
9414                                               trans->msg_type);
9415                         nft_rule_expr_deactivate(&trans->ctx,
9416                                                  nft_trans_rule(trans),
9417                                                  NFT_TRANS_COMMIT);
9418
9419                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9420                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9421                         break;
9422                 case NFT_MSG_NEWSET:
9423                         if (nft_trans_set_update(trans)) {
9424                                 struct nft_set *set = nft_trans_set(trans);
9425
9426                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9427                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9428                         } else {
9429                                 nft_clear(net, nft_trans_set(trans));
9430                                 /* This avoids hitting -EBUSY when deleting the table
9431                                  * from the transaction.
9432                                  */
9433                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9434                                     !list_empty(&nft_trans_set(trans)->bindings))
9435                                         trans->ctx.table->use--;
9436                         }
9437                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9438                                              NFT_MSG_NEWSET, GFP_KERNEL);
9439                         nft_trans_destroy(trans);
9440                         break;
9441                 case NFT_MSG_DELSET:
9442                 case NFT_MSG_DESTROYSET:
9443                         list_del_rcu(&nft_trans_set(trans)->list);
9444                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9445                                              trans->msg_type, GFP_KERNEL);
9446                         break;
9447                 case NFT_MSG_NEWSETELEM:
9448                         te = (struct nft_trans_elem *)trans->data;
9449
9450                         nft_setelem_activate(net, te->set, &te->elem);
9451                         nf_tables_setelem_notify(&trans->ctx, te->set,
9452                                                  &te->elem,
9453                                                  NFT_MSG_NEWSETELEM);
9454                         nft_trans_destroy(trans);
9455                         break;
9456                 case NFT_MSG_DELSETELEM:
9457                 case NFT_MSG_DESTROYSETELEM:
9458                         te = (struct nft_trans_elem *)trans->data;
9459
9460                         nf_tables_setelem_notify(&trans->ctx, te->set,
9461                                                  &te->elem,
9462                                                  trans->msg_type);
9463                         nft_setelem_remove(net, te->set, &te->elem);
9464                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9465                                 atomic_dec(&te->set->nelems);
9466                                 te->set->ndeact--;
9467                         }
9468                         break;
9469                 case NFT_MSG_NEWOBJ:
9470                         if (nft_trans_obj_update(trans)) {
9471                                 nft_obj_commit_update(trans);
9472                                 nf_tables_obj_notify(&trans->ctx,
9473                                                      nft_trans_obj(trans),
9474                                                      NFT_MSG_NEWOBJ);
9475                         } else {
9476                                 nft_clear(net, nft_trans_obj(trans));
9477                                 nf_tables_obj_notify(&trans->ctx,
9478                                                      nft_trans_obj(trans),
9479                                                      NFT_MSG_NEWOBJ);
9480                                 nft_trans_destroy(trans);
9481                         }
9482                         break;
9483                 case NFT_MSG_DELOBJ:
9484                 case NFT_MSG_DESTROYOBJ:
9485                         nft_obj_del(nft_trans_obj(trans));
9486                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9487                                              trans->msg_type);
9488                         break;
9489                 case NFT_MSG_NEWFLOWTABLE:
9490                         if (nft_trans_flowtable_update(trans)) {
9491                                 nft_trans_flowtable(trans)->data.flags =
9492                                         nft_trans_flowtable_flags(trans);
9493                                 nf_tables_flowtable_notify(&trans->ctx,
9494                                                            nft_trans_flowtable(trans),
9495                                                            &nft_trans_flowtable_hooks(trans),
9496                                                            NFT_MSG_NEWFLOWTABLE);
9497                                 list_splice(&nft_trans_flowtable_hooks(trans),
9498                                             &nft_trans_flowtable(trans)->hook_list);
9499                         } else {
9500                                 nft_clear(net, nft_trans_flowtable(trans));
9501                                 nf_tables_flowtable_notify(&trans->ctx,
9502                                                            nft_trans_flowtable(trans),
9503                                                            NULL,
9504                                                            NFT_MSG_NEWFLOWTABLE);
9505                         }
9506                         nft_trans_destroy(trans);
9507                         break;
9508                 case NFT_MSG_DELFLOWTABLE:
9509                 case NFT_MSG_DESTROYFLOWTABLE:
9510                         if (nft_trans_flowtable_update(trans)) {
9511                                 nf_tables_flowtable_notify(&trans->ctx,
9512                                                            nft_trans_flowtable(trans),
9513                                                            &nft_trans_flowtable_hooks(trans),
9514                                                            trans->msg_type);
9515                                 nft_unregister_flowtable_net_hooks(net,
9516                                                                    &nft_trans_flowtable_hooks(trans));
9517                         } else {
9518                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9519                                 nf_tables_flowtable_notify(&trans->ctx,
9520                                                            nft_trans_flowtable(trans),
9521                                                            NULL,
9522                                                            trans->msg_type);
9523                                 nft_unregister_flowtable_net_hooks(net,
9524                                                 &nft_trans_flowtable(trans)->hook_list);
9525                         }
9526                         break;
9527                 }
9528         }
9529
9530         nft_commit_notify(net, NETLINK_CB(skb).portid);
9531         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9532         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9533         nf_tables_commit_release(net);
9534
9535         return 0;
9536 }
9537
9538 static void nf_tables_module_autoload(struct net *net)
9539 {
9540         struct nftables_pernet *nft_net = nft_pernet(net);
9541         struct nft_module_request *req, *next;
9542         LIST_HEAD(module_list);
9543
9544         list_splice_init(&nft_net->module_list, &module_list);
9545         mutex_unlock(&nft_net->commit_mutex);
9546         list_for_each_entry_safe(req, next, &module_list, list) {
9547                 request_module("%s", req->module);
9548                 req->done = true;
9549         }
9550         mutex_lock(&nft_net->commit_mutex);
9551         list_splice(&module_list, &nft_net->module_list);
9552 }
9553
9554 static void nf_tables_abort_release(struct nft_trans *trans)
9555 {
9556         switch (trans->msg_type) {
9557         case NFT_MSG_NEWTABLE:
9558                 nf_tables_table_destroy(&trans->ctx);
9559                 break;
9560         case NFT_MSG_NEWCHAIN:
9561                 if (nft_trans_chain_update(trans))
9562                         nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9563                 else
9564                         nf_tables_chain_destroy(&trans->ctx);
9565                 break;
9566         case NFT_MSG_NEWRULE:
9567                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9568                 break;
9569         case NFT_MSG_NEWSET:
9570                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9571                 break;
9572         case NFT_MSG_NEWSETELEM:
9573                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9574                                      nft_trans_elem(trans).priv, true);
9575                 break;
9576         case NFT_MSG_NEWOBJ:
9577                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9578                 break;
9579         case NFT_MSG_NEWFLOWTABLE:
9580                 if (nft_trans_flowtable_update(trans))
9581                         nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9582                 else
9583                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9584                 break;
9585         }
9586         kfree(trans);
9587 }
9588
9589 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9590 {
9591         struct nftables_pernet *nft_net = nft_pernet(net);
9592         struct nft_trans *trans, *next;
9593         struct nft_trans_elem *te;
9594
9595         if (action == NFNL_ABORT_VALIDATE &&
9596             nf_tables_validate(net) < 0)
9597                 return -EAGAIN;
9598
9599         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9600                                          list) {
9601                 switch (trans->msg_type) {
9602                 case NFT_MSG_NEWTABLE:
9603                         if (nft_trans_table_update(trans)) {
9604                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9605                                         nft_trans_destroy(trans);
9606                                         break;
9607                                 }
9608                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9609                                         nf_tables_table_disable(net, trans->ctx.table);
9610                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9611                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9612                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9613                                 }
9614                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9615                                 nft_trans_destroy(trans);
9616                         } else {
9617                                 list_del_rcu(&trans->ctx.table->list);
9618                         }
9619                         break;
9620                 case NFT_MSG_DELTABLE:
9621                 case NFT_MSG_DESTROYTABLE:
9622                         nft_clear(trans->ctx.net, trans->ctx.table);
9623                         nft_trans_destroy(trans);
9624                         break;
9625                 case NFT_MSG_NEWCHAIN:
9626                         if (nft_trans_chain_update(trans)) {
9627                                 nft_netdev_unregister_hooks(net,
9628                                                             &nft_trans_chain_hooks(trans),
9629                                                             true);
9630                                 free_percpu(nft_trans_chain_stats(trans));
9631                                 kfree(nft_trans_chain_name(trans));
9632                                 nft_trans_destroy(trans);
9633                         } else {
9634                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9635                                         nft_trans_destroy(trans);
9636                                         break;
9637                                 }
9638                                 trans->ctx.table->use--;
9639                                 nft_chain_del(trans->ctx.chain);
9640                                 nf_tables_unregister_hook(trans->ctx.net,
9641                                                           trans->ctx.table,
9642                                                           trans->ctx.chain);
9643                         }
9644                         break;
9645                 case NFT_MSG_DELCHAIN:
9646                 case NFT_MSG_DESTROYCHAIN:
9647                         if (nft_trans_chain_update(trans)) {
9648                                 list_splice(&nft_trans_chain_hooks(trans),
9649                                             &nft_trans_basechain(trans)->hook_list);
9650                         } else {
9651                                 trans->ctx.table->use++;
9652                                 nft_clear(trans->ctx.net, trans->ctx.chain);
9653                         }
9654                         nft_trans_destroy(trans);
9655                         break;
9656                 case NFT_MSG_NEWRULE:
9657                         trans->ctx.chain->use--;
9658                         list_del_rcu(&nft_trans_rule(trans)->list);
9659                         nft_rule_expr_deactivate(&trans->ctx,
9660                                                  nft_trans_rule(trans),
9661                                                  NFT_TRANS_ABORT);
9662                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9663                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9664                         break;
9665                 case NFT_MSG_DELRULE:
9666                 case NFT_MSG_DESTROYRULE:
9667                         trans->ctx.chain->use++;
9668                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9669                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9670                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9671                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9672
9673                         nft_trans_destroy(trans);
9674                         break;
9675                 case NFT_MSG_NEWSET:
9676                         if (nft_trans_set_update(trans)) {
9677                                 nft_trans_destroy(trans);
9678                                 break;
9679                         }
9680                         trans->ctx.table->use--;
9681                         if (nft_trans_set_bound(trans)) {
9682                                 nft_trans_destroy(trans);
9683                                 break;
9684                         }
9685                         list_del_rcu(&nft_trans_set(trans)->list);
9686                         break;
9687                 case NFT_MSG_DELSET:
9688                 case NFT_MSG_DESTROYSET:
9689                         trans->ctx.table->use++;
9690                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9691                         nft_trans_destroy(trans);
9692                         break;
9693                 case NFT_MSG_NEWSETELEM:
9694                         if (nft_trans_elem_set_bound(trans)) {
9695                                 nft_trans_destroy(trans);
9696                                 break;
9697                         }
9698                         te = (struct nft_trans_elem *)trans->data;
9699                         nft_setelem_remove(net, te->set, &te->elem);
9700                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9701                                 atomic_dec(&te->set->nelems);
9702                         break;
9703                 case NFT_MSG_DELSETELEM:
9704                 case NFT_MSG_DESTROYSETELEM:
9705                         te = (struct nft_trans_elem *)trans->data;
9706
9707                         nft_setelem_data_activate(net, te->set, &te->elem);
9708                         nft_setelem_activate(net, te->set, &te->elem);
9709                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9710                                 te->set->ndeact--;
9711
9712                         nft_trans_destroy(trans);
9713                         break;
9714                 case NFT_MSG_NEWOBJ:
9715                         if (nft_trans_obj_update(trans)) {
9716                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9717                                 nft_trans_destroy(trans);
9718                         } else {
9719                                 trans->ctx.table->use--;
9720                                 nft_obj_del(nft_trans_obj(trans));
9721                         }
9722                         break;
9723                 case NFT_MSG_DELOBJ:
9724                 case NFT_MSG_DESTROYOBJ:
9725                         trans->ctx.table->use++;
9726                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9727                         nft_trans_destroy(trans);
9728                         break;
9729                 case NFT_MSG_NEWFLOWTABLE:
9730                         if (nft_trans_flowtable_update(trans)) {
9731                                 nft_unregister_flowtable_net_hooks(net,
9732                                                 &nft_trans_flowtable_hooks(trans));
9733                         } else {
9734                                 trans->ctx.table->use--;
9735                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9736                                 nft_unregister_flowtable_net_hooks(net,
9737                                                 &nft_trans_flowtable(trans)->hook_list);
9738                         }
9739                         break;
9740                 case NFT_MSG_DELFLOWTABLE:
9741                 case NFT_MSG_DESTROYFLOWTABLE:
9742                         if (nft_trans_flowtable_update(trans)) {
9743                                 list_splice(&nft_trans_flowtable_hooks(trans),
9744                                             &nft_trans_flowtable(trans)->hook_list);
9745                         } else {
9746                                 trans->ctx.table->use++;
9747                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9748                         }
9749                         nft_trans_destroy(trans);
9750                         break;
9751                 }
9752         }
9753
9754         synchronize_rcu();
9755
9756         list_for_each_entry_safe_reverse(trans, next,
9757                                          &nft_net->commit_list, list) {
9758                 list_del(&trans->list);
9759                 nf_tables_abort_release(trans);
9760         }
9761
9762         if (action == NFNL_ABORT_AUTOLOAD)
9763                 nf_tables_module_autoload(net);
9764         else
9765                 nf_tables_module_autoload_cleanup(net);
9766
9767         return 0;
9768 }
9769
9770 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9771                            enum nfnl_abort_action action)
9772 {
9773         struct nftables_pernet *nft_net = nft_pernet(net);
9774         int ret = __nf_tables_abort(net, action);
9775
9776         mutex_unlock(&nft_net->commit_mutex);
9777
9778         return ret;
9779 }
9780
9781 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9782 {
9783         struct nftables_pernet *nft_net = nft_pernet(net);
9784         bool genid_ok;
9785
9786         mutex_lock(&nft_net->commit_mutex);
9787
9788         genid_ok = genid == 0 || nft_net->base_seq == genid;
9789         if (!genid_ok)
9790                 mutex_unlock(&nft_net->commit_mutex);
9791
9792         /* else, commit mutex has to be released by commit or abort function */
9793         return genid_ok;
9794 }
9795
9796 static const struct nfnetlink_subsystem nf_tables_subsys = {
9797         .name           = "nf_tables",
9798         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9799         .cb_count       = NFT_MSG_MAX,
9800         .cb             = nf_tables_cb,
9801         .commit         = nf_tables_commit,
9802         .abort          = nf_tables_abort,
9803         .valid_genid    = nf_tables_valid_genid,
9804         .owner          = THIS_MODULE,
9805 };
9806
9807 int nft_chain_validate_dependency(const struct nft_chain *chain,
9808                                   enum nft_chain_types type)
9809 {
9810         const struct nft_base_chain *basechain;
9811
9812         if (nft_is_base_chain(chain)) {
9813                 basechain = nft_base_chain(chain);
9814                 if (basechain->type->type != type)
9815                         return -EOPNOTSUPP;
9816         }
9817         return 0;
9818 }
9819 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9820
9821 int nft_chain_validate_hooks(const struct nft_chain *chain,
9822                              unsigned int hook_flags)
9823 {
9824         struct nft_base_chain *basechain;
9825
9826         if (nft_is_base_chain(chain)) {
9827                 basechain = nft_base_chain(chain);
9828
9829                 if ((1 << basechain->ops.hooknum) & hook_flags)
9830                         return 0;
9831
9832                 return -EOPNOTSUPP;
9833         }
9834
9835         return 0;
9836 }
9837 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9838
9839 /*
9840  * Loop detection - walk through the ruleset beginning at the destination chain
9841  * of a new jump until either the source chain is reached (loop) or all
9842  * reachable chains have been traversed.
9843  *
9844  * The loop check is performed whenever a new jump verdict is added to an
9845  * expression or verdict map or a verdict map is bound to a new chain.
9846  */
9847
9848 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9849                                  const struct nft_chain *chain);
9850
9851 static int nft_check_loops(const struct nft_ctx *ctx,
9852                            const struct nft_set_ext *ext)
9853 {
9854         const struct nft_data *data;
9855         int ret;
9856
9857         data = nft_set_ext_data(ext);
9858         switch (data->verdict.code) {
9859         case NFT_JUMP:
9860         case NFT_GOTO:
9861                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9862                 break;
9863         default:
9864                 ret = 0;
9865                 break;
9866         }
9867
9868         return ret;
9869 }
9870
9871 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9872                                         struct nft_set *set,
9873                                         const struct nft_set_iter *iter,
9874                                         struct nft_set_elem *elem)
9875 {
9876         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9877
9878         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9879             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9880                 return 0;
9881
9882         return nft_check_loops(ctx, ext);
9883 }
9884
9885 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9886                                   struct nft_set *set)
9887 {
9888         u8 genmask = nft_genmask_next(ctx->net);
9889         struct nft_set_elem_catchall *catchall;
9890         struct nft_set_ext *ext;
9891         int ret = 0;
9892
9893         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9894                 ext = nft_set_elem_ext(set, catchall->elem);
9895                 if (!nft_set_elem_active(ext, genmask))
9896                         continue;
9897
9898                 ret = nft_check_loops(ctx, ext);
9899                 if (ret < 0)
9900                         return ret;
9901         }
9902
9903         return ret;
9904 }
9905
9906 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9907                                  const struct nft_chain *chain)
9908 {
9909         const struct nft_rule *rule;
9910         const struct nft_expr *expr, *last;
9911         struct nft_set *set;
9912         struct nft_set_binding *binding;
9913         struct nft_set_iter iter;
9914
9915         if (ctx->chain == chain)
9916                 return -ELOOP;
9917
9918         list_for_each_entry(rule, &chain->rules, list) {
9919                 nft_rule_for_each_expr(expr, last, rule) {
9920                         struct nft_immediate_expr *priv;
9921                         const struct nft_data *data;
9922                         int err;
9923
9924                         if (strcmp(expr->ops->type->name, "immediate"))
9925                                 continue;
9926
9927                         priv = nft_expr_priv(expr);
9928                         if (priv->dreg != NFT_REG_VERDICT)
9929                                 continue;
9930
9931                         data = &priv->data;
9932                         switch (data->verdict.code) {
9933                         case NFT_JUMP:
9934                         case NFT_GOTO:
9935                                 err = nf_tables_check_loops(ctx,
9936                                                         data->verdict.chain);
9937                                 if (err < 0)
9938                                         return err;
9939                                 break;
9940                         default:
9941                                 break;
9942                         }
9943                 }
9944         }
9945
9946         list_for_each_entry(set, &ctx->table->sets, list) {
9947                 if (!nft_is_active_next(ctx->net, set))
9948                         continue;
9949                 if (!(set->flags & NFT_SET_MAP) ||
9950                     set->dtype != NFT_DATA_VERDICT)
9951                         continue;
9952
9953                 list_for_each_entry(binding, &set->bindings, list) {
9954                         if (!(binding->flags & NFT_SET_MAP) ||
9955                             binding->chain != chain)
9956                                 continue;
9957
9958                         iter.genmask    = nft_genmask_next(ctx->net);
9959                         iter.skip       = 0;
9960                         iter.count      = 0;
9961                         iter.err        = 0;
9962                         iter.fn         = nf_tables_loop_check_setelem;
9963
9964                         set->ops->walk(ctx, set, &iter);
9965                         if (!iter.err)
9966                                 iter.err = nft_set_catchall_loops(ctx, set);
9967
9968                         if (iter.err < 0)
9969                                 return iter.err;
9970                 }
9971         }
9972
9973         return 0;
9974 }
9975
9976 /**
9977  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9978  *
9979  *      @attr: netlink attribute to fetch value from
9980  *      @max: maximum value to be stored in dest
9981  *      @dest: pointer to the variable
9982  *
9983  *      Parse, check and store a given u32 netlink attribute into variable.
9984  *      This function returns -ERANGE if the value goes over maximum value.
9985  *      Otherwise a 0 is returned and the attribute value is stored in the
9986  *      destination variable.
9987  */
9988 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9989 {
9990         u32 val;
9991
9992         val = ntohl(nla_get_be32(attr));
9993         if (val > max)
9994                 return -ERANGE;
9995
9996         *dest = val;
9997         return 0;
9998 }
9999 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10000
10001 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10002 {
10003         unsigned int reg;
10004
10005         reg = ntohl(nla_get_be32(attr));
10006         switch (reg) {
10007         case NFT_REG_VERDICT...NFT_REG_4:
10008                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10009                 break;
10010         case NFT_REG32_00...NFT_REG32_15:
10011                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10012                 break;
10013         default:
10014                 return -ERANGE;
10015         }
10016
10017         return 0;
10018 }
10019
10020 /**
10021  *      nft_dump_register - dump a register value to a netlink attribute
10022  *
10023  *      @skb: socket buffer
10024  *      @attr: attribute number
10025  *      @reg: register number
10026  *
10027  *      Construct a netlink attribute containing the register number. For
10028  *      compatibility reasons, register numbers being a multiple of 4 are
10029  *      translated to the corresponding 128 bit register numbers.
10030  */
10031 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10032 {
10033         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10034                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10035         else
10036                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10037
10038         return nla_put_be32(skb, attr, htonl(reg));
10039 }
10040 EXPORT_SYMBOL_GPL(nft_dump_register);
10041
10042 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10043 {
10044         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10045                 return -EINVAL;
10046         if (len == 0)
10047                 return -EINVAL;
10048         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10049                 return -ERANGE;
10050
10051         return 0;
10052 }
10053
10054 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10055 {
10056         u32 reg;
10057         int err;
10058
10059         err = nft_parse_register(attr, &reg);
10060         if (err < 0)
10061                 return err;
10062
10063         err = nft_validate_register_load(reg, len);
10064         if (err < 0)
10065                 return err;
10066
10067         *sreg = reg;
10068         return 0;
10069 }
10070 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10071
10072 static int nft_validate_register_store(const struct nft_ctx *ctx,
10073                                        enum nft_registers reg,
10074                                        const struct nft_data *data,
10075                                        enum nft_data_types type,
10076                                        unsigned int len)
10077 {
10078         int err;
10079
10080         switch (reg) {
10081         case NFT_REG_VERDICT:
10082                 if (type != NFT_DATA_VERDICT)
10083                         return -EINVAL;
10084
10085                 if (data != NULL &&
10086                     (data->verdict.code == NFT_GOTO ||
10087                      data->verdict.code == NFT_JUMP)) {
10088                         err = nf_tables_check_loops(ctx, data->verdict.chain);
10089                         if (err < 0)
10090                                 return err;
10091                 }
10092
10093                 return 0;
10094         default:
10095                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10096                         return -EINVAL;
10097                 if (len == 0)
10098                         return -EINVAL;
10099                 if (reg * NFT_REG32_SIZE + len >
10100                     sizeof_field(struct nft_regs, data))
10101                         return -ERANGE;
10102
10103                 if (data != NULL && type != NFT_DATA_VALUE)
10104                         return -EINVAL;
10105                 return 0;
10106         }
10107 }
10108
10109 int nft_parse_register_store(const struct nft_ctx *ctx,
10110                              const struct nlattr *attr, u8 *dreg,
10111                              const struct nft_data *data,
10112                              enum nft_data_types type, unsigned int len)
10113 {
10114         int err;
10115         u32 reg;
10116
10117         err = nft_parse_register(attr, &reg);
10118         if (err < 0)
10119                 return err;
10120
10121         err = nft_validate_register_store(ctx, reg, data, type, len);
10122         if (err < 0)
10123                 return err;
10124
10125         *dreg = reg;
10126         return 0;
10127 }
10128 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10129
10130 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10131         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
10132         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
10133                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
10134         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10135 };
10136
10137 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10138                             struct nft_data_desc *desc, const struct nlattr *nla)
10139 {
10140         u8 genmask = nft_genmask_next(ctx->net);
10141         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10142         struct nft_chain *chain;
10143         int err;
10144
10145         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10146                                           nft_verdict_policy, NULL);
10147         if (err < 0)
10148                 return err;
10149
10150         if (!tb[NFTA_VERDICT_CODE])
10151                 return -EINVAL;
10152         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10153
10154         switch (data->verdict.code) {
10155         default:
10156                 switch (data->verdict.code & NF_VERDICT_MASK) {
10157                 case NF_ACCEPT:
10158                 case NF_DROP:
10159                 case NF_QUEUE:
10160                         break;
10161                 default:
10162                         return -EINVAL;
10163                 }
10164                 fallthrough;
10165         case NFT_CONTINUE:
10166         case NFT_BREAK:
10167         case NFT_RETURN:
10168                 break;
10169         case NFT_JUMP:
10170         case NFT_GOTO:
10171                 if (tb[NFTA_VERDICT_CHAIN]) {
10172                         chain = nft_chain_lookup(ctx->net, ctx->table,
10173                                                  tb[NFTA_VERDICT_CHAIN],
10174                                                  genmask);
10175                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10176                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10177                                                       tb[NFTA_VERDICT_CHAIN_ID]);
10178                         if (IS_ERR(chain))
10179                                 return PTR_ERR(chain);
10180                 } else {
10181                         return -EINVAL;
10182                 }
10183
10184                 if (IS_ERR(chain))
10185                         return PTR_ERR(chain);
10186                 if (nft_is_base_chain(chain))
10187                         return -EOPNOTSUPP;
10188                 if (nft_chain_is_bound(chain))
10189                         return -EINVAL;
10190                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10191                     chain->flags & NFT_CHAIN_BINDING)
10192                         return -EINVAL;
10193
10194                 chain->use++;
10195                 data->verdict.chain = chain;
10196                 break;
10197         }
10198
10199         desc->len = sizeof(data->verdict);
10200
10201         return 0;
10202 }
10203
10204 static void nft_verdict_uninit(const struct nft_data *data)
10205 {
10206         struct nft_chain *chain;
10207         struct nft_rule *rule;
10208
10209         switch (data->verdict.code) {
10210         case NFT_JUMP:
10211         case NFT_GOTO:
10212                 chain = data->verdict.chain;
10213                 chain->use--;
10214
10215                 if (!nft_chain_is_bound(chain))
10216                         break;
10217
10218                 chain->table->use--;
10219                 list_for_each_entry(rule, &chain->rules, list)
10220                         chain->use--;
10221
10222                 nft_chain_del(chain);
10223                 break;
10224         }
10225 }
10226
10227 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10228 {
10229         struct nlattr *nest;
10230
10231         nest = nla_nest_start_noflag(skb, type);
10232         if (!nest)
10233                 goto nla_put_failure;
10234
10235         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10236                 goto nla_put_failure;
10237
10238         switch (v->code) {
10239         case NFT_JUMP:
10240         case NFT_GOTO:
10241                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10242                                    v->chain->name))
10243                         goto nla_put_failure;
10244         }
10245         nla_nest_end(skb, nest);
10246         return 0;
10247
10248 nla_put_failure:
10249         return -1;
10250 }
10251
10252 static int nft_value_init(const struct nft_ctx *ctx,
10253                           struct nft_data *data, struct nft_data_desc *desc,
10254                           const struct nlattr *nla)
10255 {
10256         unsigned int len;
10257
10258         len = nla_len(nla);
10259         if (len == 0)
10260                 return -EINVAL;
10261         if (len > desc->size)
10262                 return -EOVERFLOW;
10263         if (desc->len) {
10264                 if (len != desc->len)
10265                         return -EINVAL;
10266         } else {
10267                 desc->len = len;
10268         }
10269
10270         nla_memcpy(data->data, nla, len);
10271
10272         return 0;
10273 }
10274
10275 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10276                           unsigned int len)
10277 {
10278         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10279 }
10280
10281 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10282         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10283         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10284 };
10285
10286 /**
10287  *      nft_data_init - parse nf_tables data netlink attributes
10288  *
10289  *      @ctx: context of the expression using the data
10290  *      @data: destination struct nft_data
10291  *      @desc: data description
10292  *      @nla: netlink attribute containing data
10293  *
10294  *      Parse the netlink data attributes and initialize a struct nft_data.
10295  *      The type and length of data are returned in the data description.
10296  *
10297  *      The caller can indicate that it only wants to accept data of type
10298  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10299  */
10300 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10301                   struct nft_data_desc *desc, const struct nlattr *nla)
10302 {
10303         struct nlattr *tb[NFTA_DATA_MAX + 1];
10304         int err;
10305
10306         if (WARN_ON_ONCE(!desc->size))
10307                 return -EINVAL;
10308
10309         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10310                                           nft_data_policy, NULL);
10311         if (err < 0)
10312                 return err;
10313
10314         if (tb[NFTA_DATA_VALUE]) {
10315                 if (desc->type != NFT_DATA_VALUE)
10316                         return -EINVAL;
10317
10318                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10319         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10320                 if (desc->type != NFT_DATA_VERDICT)
10321                         return -EINVAL;
10322
10323                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10324         } else {
10325                 err = -EINVAL;
10326         }
10327
10328         return err;
10329 }
10330 EXPORT_SYMBOL_GPL(nft_data_init);
10331
10332 /**
10333  *      nft_data_release - release a nft_data item
10334  *
10335  *      @data: struct nft_data to release
10336  *      @type: type of data
10337  *
10338  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10339  *      all others need to be released by calling this function.
10340  */
10341 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10342 {
10343         if (type < NFT_DATA_VERDICT)
10344                 return;
10345         switch (type) {
10346         case NFT_DATA_VERDICT:
10347                 return nft_verdict_uninit(data);
10348         default:
10349                 WARN_ON(1);
10350         }
10351 }
10352 EXPORT_SYMBOL_GPL(nft_data_release);
10353
10354 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10355                   enum nft_data_types type, unsigned int len)
10356 {
10357         struct nlattr *nest;
10358         int err;
10359
10360         nest = nla_nest_start_noflag(skb, attr);
10361         if (nest == NULL)
10362                 return -1;
10363
10364         switch (type) {
10365         case NFT_DATA_VALUE:
10366                 err = nft_value_dump(skb, data, len);
10367                 break;
10368         case NFT_DATA_VERDICT:
10369                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10370                 break;
10371         default:
10372                 err = -EINVAL;
10373                 WARN_ON(1);
10374         }
10375
10376         nla_nest_end(skb, nest);
10377         return err;
10378 }
10379 EXPORT_SYMBOL_GPL(nft_data_dump);
10380
10381 int __nft_release_basechain(struct nft_ctx *ctx)
10382 {
10383         struct nft_rule *rule, *nr;
10384
10385         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10386                 return 0;
10387
10388         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10389         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10390                 list_del(&rule->list);
10391                 ctx->chain->use--;
10392                 nf_tables_rule_release(ctx, rule);
10393         }
10394         nft_chain_del(ctx->chain);
10395         ctx->table->use--;
10396         nf_tables_chain_destroy(ctx);
10397
10398         return 0;
10399 }
10400 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10401
10402 static void __nft_release_hook(struct net *net, struct nft_table *table)
10403 {
10404         struct nft_flowtable *flowtable;
10405         struct nft_chain *chain;
10406
10407         list_for_each_entry(chain, &table->chains, list)
10408                 __nf_tables_unregister_hook(net, table, chain, true);
10409         list_for_each_entry(flowtable, &table->flowtables, list)
10410                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10411                                                      true);
10412 }
10413
10414 static void __nft_release_hooks(struct net *net)
10415 {
10416         struct nftables_pernet *nft_net = nft_pernet(net);
10417         struct nft_table *table;
10418
10419         list_for_each_entry(table, &nft_net->tables, list) {
10420                 if (nft_table_has_owner(table))
10421                         continue;
10422
10423                 __nft_release_hook(net, table);
10424         }
10425 }
10426
10427 static void __nft_release_table(struct net *net, struct nft_table *table)
10428 {
10429         struct nft_flowtable *flowtable, *nf;
10430         struct nft_chain *chain, *nc;
10431         struct nft_object *obj, *ne;
10432         struct nft_rule *rule, *nr;
10433         struct nft_set *set, *ns;
10434         struct nft_ctx ctx = {
10435                 .net    = net,
10436                 .family = NFPROTO_NETDEV,
10437         };
10438
10439         ctx.family = table->family;
10440         ctx.table = table;
10441         list_for_each_entry(chain, &table->chains, list) {
10442                 ctx.chain = chain;
10443                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10444                         list_del(&rule->list);
10445                         chain->use--;
10446                         nf_tables_rule_release(&ctx, rule);
10447                 }
10448         }
10449         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10450                 list_del(&flowtable->list);
10451                 table->use--;
10452                 nf_tables_flowtable_destroy(flowtable);
10453         }
10454         list_for_each_entry_safe(set, ns, &table->sets, list) {
10455                 list_del(&set->list);
10456                 table->use--;
10457                 nft_set_destroy(&ctx, set);
10458         }
10459         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10460                 nft_obj_del(obj);
10461                 table->use--;
10462                 nft_obj_destroy(&ctx, obj);
10463         }
10464         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10465                 ctx.chain = chain;
10466                 nft_chain_del(chain);
10467                 table->use--;
10468                 nf_tables_chain_destroy(&ctx);
10469         }
10470         nf_tables_table_destroy(&ctx);
10471 }
10472
10473 static void __nft_release_tables(struct net *net)
10474 {
10475         struct nftables_pernet *nft_net = nft_pernet(net);
10476         struct nft_table *table, *nt;
10477
10478         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10479                 if (nft_table_has_owner(table))
10480                         continue;
10481
10482                 list_del(&table->list);
10483
10484                 __nft_release_table(net, table);
10485         }
10486 }
10487
10488 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10489                             void *ptr)
10490 {
10491         struct nft_table *table, *to_delete[8];
10492         struct nftables_pernet *nft_net;
10493         struct netlink_notify *n = ptr;
10494         struct net *net = n->net;
10495         unsigned int deleted;
10496         bool restart = false;
10497
10498         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10499                 return NOTIFY_DONE;
10500
10501         nft_net = nft_pernet(net);
10502         deleted = 0;
10503         mutex_lock(&nft_net->commit_mutex);
10504         if (!list_empty(&nf_tables_destroy_list))
10505                 rcu_barrier();
10506 again:
10507         list_for_each_entry(table, &nft_net->tables, list) {
10508                 if (nft_table_has_owner(table) &&
10509                     n->portid == table->nlpid) {
10510                         __nft_release_hook(net, table);
10511                         list_del_rcu(&table->list);
10512                         to_delete[deleted++] = table;
10513                         if (deleted >= ARRAY_SIZE(to_delete))
10514                                 break;
10515                 }
10516         }
10517         if (deleted) {
10518                 restart = deleted >= ARRAY_SIZE(to_delete);
10519                 synchronize_rcu();
10520                 while (deleted)
10521                         __nft_release_table(net, to_delete[--deleted]);
10522
10523                 if (restart)
10524                         goto again;
10525         }
10526         mutex_unlock(&nft_net->commit_mutex);
10527
10528         return NOTIFY_DONE;
10529 }
10530
10531 static struct notifier_block nft_nl_notifier = {
10532         .notifier_call  = nft_rcv_nl_event,
10533 };
10534
10535 static int __net_init nf_tables_init_net(struct net *net)
10536 {
10537         struct nftables_pernet *nft_net = nft_pernet(net);
10538
10539         INIT_LIST_HEAD(&nft_net->tables);
10540         INIT_LIST_HEAD(&nft_net->commit_list);
10541         INIT_LIST_HEAD(&nft_net->module_list);
10542         INIT_LIST_HEAD(&nft_net->notify_list);
10543         mutex_init(&nft_net->commit_mutex);
10544         nft_net->base_seq = 1;
10545
10546         return 0;
10547 }
10548
10549 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10550 {
10551         struct nftables_pernet *nft_net = nft_pernet(net);
10552
10553         mutex_lock(&nft_net->commit_mutex);
10554         __nft_release_hooks(net);
10555         mutex_unlock(&nft_net->commit_mutex);
10556 }
10557
10558 static void __net_exit nf_tables_exit_net(struct net *net)
10559 {
10560         struct nftables_pernet *nft_net = nft_pernet(net);
10561
10562         mutex_lock(&nft_net->commit_mutex);
10563         if (!list_empty(&nft_net->commit_list) ||
10564             !list_empty(&nft_net->module_list))
10565                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10566         __nft_release_tables(net);
10567         mutex_unlock(&nft_net->commit_mutex);
10568         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10569         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10570         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10571 }
10572
10573 static struct pernet_operations nf_tables_net_ops = {
10574         .init           = nf_tables_init_net,
10575         .pre_exit       = nf_tables_pre_exit_net,
10576         .exit           = nf_tables_exit_net,
10577         .id             = &nf_tables_net_id,
10578         .size           = sizeof(struct nftables_pernet),
10579 };
10580
10581 static int __init nf_tables_module_init(void)
10582 {
10583         int err;
10584
10585         err = register_pernet_subsys(&nf_tables_net_ops);
10586         if (err < 0)
10587                 return err;
10588
10589         err = nft_chain_filter_init();
10590         if (err < 0)
10591                 goto err_chain_filter;
10592
10593         err = nf_tables_core_module_init();
10594         if (err < 0)
10595                 goto err_core_module;
10596
10597         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10598         if (err < 0)
10599                 goto err_netdev_notifier;
10600
10601         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10602         if (err < 0)
10603                 goto err_rht_objname;
10604
10605         err = nft_offload_init();
10606         if (err < 0)
10607                 goto err_offload;
10608
10609         err = netlink_register_notifier(&nft_nl_notifier);
10610         if (err < 0)
10611                 goto err_netlink_notifier;
10612
10613         /* must be last */
10614         err = nfnetlink_subsys_register(&nf_tables_subsys);
10615         if (err < 0)
10616                 goto err_nfnl_subsys;
10617
10618         nft_chain_route_init();
10619
10620         return err;
10621
10622 err_nfnl_subsys:
10623         netlink_unregister_notifier(&nft_nl_notifier);
10624 err_netlink_notifier:
10625         nft_offload_exit();
10626 err_offload:
10627         rhltable_destroy(&nft_objname_ht);
10628 err_rht_objname:
10629         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10630 err_netdev_notifier:
10631         nf_tables_core_module_exit();
10632 err_core_module:
10633         nft_chain_filter_fini();
10634 err_chain_filter:
10635         unregister_pernet_subsys(&nf_tables_net_ops);
10636         return err;
10637 }
10638
10639 static void __exit nf_tables_module_exit(void)
10640 {
10641         nfnetlink_subsys_unregister(&nf_tables_subsys);
10642         netlink_unregister_notifier(&nft_nl_notifier);
10643         nft_offload_exit();
10644         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10645         nft_chain_filter_fini();
10646         nft_chain_route_fini();
10647         unregister_pernet_subsys(&nf_tables_net_ops);
10648         cancel_work_sync(&trans_destroy_work);
10649         rcu_barrier();
10650         rhltable_destroy(&nft_objname_ht);
10651         nf_tables_core_module_exit();
10652 }
10653
10654 module_init(nf_tables_module_init);
10655 module_exit(nf_tables_module_exit);
10656
10657 MODULE_LICENSE("GPL");
10658 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10659 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);