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_FLAGS,
 823                          htonl(table->flags & NFT_TABLE_F_MASK)) ||
 824             nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
 825             nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
 826                          NFTA_TABLE_PAD))
 827                 goto nla_put_failure;
 828         if (nft_table_has_owner(table) &&
 829             nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
 830                 goto nla_put_failure;
 831
 832         if (table->udata) {
 833                 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
 834                         goto nla_put_failure;
 835         }
 836
 837         nlmsg_end(skb, nlh);
 838         return 0;
 839
 840 nla_put_failure:
 841         nlmsg_trim(skb, nlh);
 842         return -1;
 843 }
 844
 845 struct nftnl_skb_parms {
 846         bool report;
 847 };
 848 #define NFT_CB(skb)     (*(struct nftnl_skb_parms*)&((skb)->cb))
 849
 850 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
 851                                struct list_head *notify_list)
 852 {
 853         NFT_CB(skb).report = report;
 854         list_add_tail(&skb->list, notify_list);
 855 }
 856
 857 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
 858 {
 859         struct nftables_pernet *nft_net;
 860         struct sk_buff *skb;
 861         u16 flags = 0;
 862         int err;
 863
 864         if (!ctx->report &&
 865             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
 866                 return;
 867
 868         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 869         if (skb == NULL)
 870                 goto err;
 871
 872         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
 873                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
 874
 875         err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
 876                                         event, flags, ctx->family, ctx->table);
 877         if (err < 0) {
 878                 kfree_skb(skb);
 879                 goto err;
 880         }
 881
 882         nft_net = nft_pernet(ctx->net);
 883         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
 884         return;
 885 err:
 886         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
 887 }
 888
 889 static int nf_tables_dump_tables(struct sk_buff *skb,
 890                                  struct netlink_callback *cb)
 891 {
 892         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 893         struct nftables_pernet *nft_net;
 894         const struct nft_table *table;
 895         unsigned int idx = 0, s_idx = cb->args[0];
 896         struct net *net = sock_net(skb->sk);
 897         int family = nfmsg->nfgen_family;
 898
 899         rcu_read_lock();
 900         nft_net = nft_pernet(net);
 901         cb->seq = READ_ONCE(nft_net->base_seq);
 902
 903         list_for_each_entry_rcu(table, &nft_net->tables, list) {
 904                 if (family != NFPROTO_UNSPEC && family != table->family)
 905                         continue;
 906
 907                 if (idx < s_idx)
 908                         goto cont;
 909                 if (idx > s_idx)
 910                         memset(&cb->args[1], 0,
 911                                sizeof(cb->args) - sizeof(cb->args[0]));
 912                 if (!nft_is_active(net, table))
 913                         continue;
 914                 if (nf_tables_fill_table_info(skb, net,
 915                                               NETLINK_CB(cb->skb).portid,
 916                                               cb->nlh->nlmsg_seq,
 917                                               NFT_MSG_NEWTABLE, NLM_F_MULTI,
 918                                               table->family, table) < 0)
 919                         goto done;
 920
 921                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 922 cont:
 923                 idx++;
 924         }
 925 done:
 926         rcu_read_unlock();
 927         cb->args[0] = idx;
 928         return skb->len;
 929 }
 930
 931 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
 932                                       const struct nlmsghdr *nlh,
 933                                       struct netlink_dump_control *c)
 934 {
 935         int err;
 936
 937         if (!try_module_get(THIS_MODULE))
 938                 return -EINVAL;
 939
 940         rcu_read_unlock();
 941         err = netlink_dump_start(nlsk, skb, nlh, c);
 942         rcu_read_lock();
 943         module_put(THIS_MODULE);
 944
 945         return err;
 946 }
 947
 948 /* called with rcu_read_lock held */
 949 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
 950                               const struct nlattr * const nla[])
 951 {
 952         struct netlink_ext_ack *extack = info->extack;
 953         u8 genmask = nft_genmask_cur(info->net);
 954         u8 family = info->nfmsg->nfgen_family;
 955         const struct nft_table *table;
 956         struct net *net = info->net;
 957         struct sk_buff *skb2;
 958         int err;
 959
 960         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
 961                 struct netlink_dump_control c = {
 962                         .dump = nf_tables_dump_tables,
 963                         .module = THIS_MODULE,
 964                 };
 965
 966                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
 967         }
 968
 969         table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
 970         if (IS_ERR(table)) {
 971                 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
 972                 return PTR_ERR(table);
 973         }
 974
 975         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 976         if (!skb2)
 977                 return -ENOMEM;
 978
 979         err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
 980                                         info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
 981                                         0, family, table);
 982         if (err < 0)
 983                 goto err_fill_table_info;
 984
 985         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
 986
 987 err_fill_table_info:
 988         kfree_skb(skb2);
 989         return err;
 990 }
 991
 992 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
 993 {
 994         struct nft_chain *chain;
 995         u32 i = 0;
 996
 997         list_for_each_entry(chain, &table->chains, list) {
 998                 if (!nft_is_active_next(net, chain))
 999                         continue;
1000                 if (!nft_is_base_chain(chain))
1001                         continue;
1002
1003                 if (cnt && i++ == cnt)
1004                         break;
1005
1006                 nf_tables_unregister_hook(net, table, chain);
1007         }
1008 }
1009
1010 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1011 {
1012         struct nft_chain *chain;
1013         int err, i = 0;
1014
1015         list_for_each_entry(chain, &table->chains, list) {
1016                 if (!nft_is_active_next(net, chain))
1017                         continue;
1018                 if (!nft_is_base_chain(chain))
1019                         continue;
1020
1021                 err = nf_tables_register_hook(net, table, chain);
1022                 if (err < 0)
1023                         goto err_register_hooks;
1024
1025                 i++;
1026         }
1027         return 0;
1028
1029 err_register_hooks:
1030         if (i)
1031                 nft_table_disable(net, table, i);
1032         return err;
1033 }
1034
1035 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1036 {
1037         table->flags &= ~NFT_TABLE_F_DORMANT;
1038         nft_table_disable(net, table, 0);
1039         table->flags |= NFT_TABLE_F_DORMANT;
1040 }
1041
1042 #define __NFT_TABLE_F_INTERNAL          (NFT_TABLE_F_MASK + 1)
1043 #define __NFT_TABLE_F_WAS_DORMANT       (__NFT_TABLE_F_INTERNAL << 0)
1044 #define __NFT_TABLE_F_WAS_AWAKEN        (__NFT_TABLE_F_INTERNAL << 1)
1045 #define __NFT_TABLE_F_UPDATE            (__NFT_TABLE_F_WAS_DORMANT | \
1046                                          __NFT_TABLE_F_WAS_AWAKEN)
1047
1048 static int nf_tables_updtable(struct nft_ctx *ctx)
1049 {
1050         struct nft_trans *trans;
1051         u32 flags;
1052         int ret;
1053
1054         if (!ctx->nla[NFTA_TABLE_FLAGS])
1055                 return 0;
1056
1057         flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1058         if (flags & ~NFT_TABLE_F_MASK)
1059                 return -EOPNOTSUPP;
1060
1061         if (flags == ctx->table->flags)
1062                 return 0;
1063
1064         if ((nft_table_has_owner(ctx->table) &&
1065              !(flags & NFT_TABLE_F_OWNER)) ||
1066             (!nft_table_has_owner(ctx->table) &&
1067              flags & NFT_TABLE_F_OWNER))
1068                 return -EOPNOTSUPP;
1069
1070         trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1071                                 sizeof(struct nft_trans_table));
1072         if (trans == NULL)
1073                 return -ENOMEM;
1074
1075         if ((flags & NFT_TABLE_F_DORMANT) &&
1076             !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1077                 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1078                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1079                         ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1080         } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1081                    ctx->table->flags & NFT_TABLE_F_DORMANT) {
1082                 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1083                 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1084                         ret = nf_tables_table_enable(ctx->net, ctx->table);
1085                         if (ret < 0)
1086                                 goto err_register_hooks;
1087
1088                         ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1089                 }
1090         }
1091
1092         nft_trans_table_update(trans) = true;
1093         nft_trans_commit_list_add_tail(ctx->net, trans);
1094
1095         return 0;
1096
1097 err_register_hooks:
1098         nft_trans_destroy(trans);
1099         return ret;
1100 }
1101
1102 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1103 {
1104         const char *name = data;
1105
1106         return jhash(name, strlen(name), seed);
1107 }
1108
1109 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1110 {
1111         const struct nft_chain *chain = data;
1112
1113         return nft_chain_hash(chain->name, 0, seed);
1114 }
1115
1116 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1117                               const void *ptr)
1118 {
1119         const struct nft_chain *chain = ptr;
1120         const char *name = arg->key;
1121
1122         return strcmp(chain->name, name);
1123 }
1124
1125 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1126 {
1127         const struct nft_object_hash_key *k = data;
1128
1129         seed ^= hash_ptr(k->table, 32);
1130
1131         return jhash(k->name, strlen(k->name), seed);
1132 }
1133
1134 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1135 {
1136         const struct nft_object *obj = data;
1137
1138         return nft_objname_hash(&obj->key, 0, seed);
1139 }
1140
1141 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1142                                 const void *ptr)
1143 {
1144         const struct nft_object_hash_key *k = arg->key;
1145         const struct nft_object *obj = ptr;
1146
1147         if (obj->key.table != k->table)
1148                 return -1;
1149
1150         return strcmp(obj->key.name, k->name);
1151 }
1152
1153 static bool nft_supported_family(u8 family)
1154 {
1155         return false
1156 #ifdef CONFIG_NF_TABLES_INET
1157                 || family == NFPROTO_INET
1158 #endif
1159 #ifdef CONFIG_NF_TABLES_IPV4
1160                 || family == NFPROTO_IPV4
1161 #endif
1162 #ifdef CONFIG_NF_TABLES_ARP
1163                 || family == NFPROTO_ARP
1164 #endif
1165 #ifdef CONFIG_NF_TABLES_NETDEV
1166                 || family == NFPROTO_NETDEV
1167 #endif
1168 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1169                 || family == NFPROTO_BRIDGE
1170 #endif
1171 #ifdef CONFIG_NF_TABLES_IPV6
1172                 || family == NFPROTO_IPV6
1173 #endif
1174                 ;
1175 }
1176
1177 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1178                               const struct nlattr * const nla[])
1179 {
1180         struct nftables_pernet *nft_net = nft_pernet(info->net);
1181         struct netlink_ext_ack *extack = info->extack;
1182         u8 genmask = nft_genmask_next(info->net);
1183         u8 family = info->nfmsg->nfgen_family;
1184         struct net *net = info->net;
1185         const struct nlattr *attr;
1186         struct nft_table *table;
1187         struct nft_ctx ctx;
1188         u32 flags = 0;
1189         int err;
1190
1191         if (!nft_supported_family(family))
1192                 return -EOPNOTSUPP;
1193
1194         lockdep_assert_held(&nft_net->commit_mutex);
1195         attr = nla[NFTA_TABLE_NAME];
1196         table = nft_table_lookup(net, attr, family, genmask,
1197                                  NETLINK_CB(skb).portid);
1198         if (IS_ERR(table)) {
1199                 if (PTR_ERR(table) != -ENOENT)
1200                         return PTR_ERR(table);
1201         } else {
1202                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1203                         NL_SET_BAD_ATTR(extack, attr);
1204                         return -EEXIST;
1205                 }
1206                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1207                         return -EOPNOTSUPP;
1208
1209                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1210
1211                 return nf_tables_updtable(&ctx);
1212         }
1213
1214         if (nla[NFTA_TABLE_FLAGS]) {
1215                 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1216                 if (flags & ~NFT_TABLE_F_MASK)
1217                         return -EOPNOTSUPP;
1218         }
1219
1220         err = -ENOMEM;
1221         table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1222         if (table == NULL)
1223                 goto err_kzalloc;
1224
1225         table->validate_state = NFT_VALIDATE_SKIP;
1226         table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1227         if (table->name == NULL)
1228                 goto err_strdup;
1229
1230         if (nla[NFTA_TABLE_USERDATA]) {
1231                 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1232                 if (table->udata == NULL)
1233                         goto err_table_udata;
1234
1235                 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1236         }
1237
1238         err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1239         if (err)
1240                 goto err_chain_ht;
1241
1242         INIT_LIST_HEAD(&table->chains);
1243         INIT_LIST_HEAD(&table->sets);
1244         INIT_LIST_HEAD(&table->objects);
1245         INIT_LIST_HEAD(&table->flowtables);
1246         table->family = family;
1247         table->flags = flags;
1248         table->handle = ++nft_net->table_handle;
1249         if (table->flags & NFT_TABLE_F_OWNER)
1250                 table->nlpid = NETLINK_CB(skb).portid;
1251
1252         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1253         err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1254         if (err < 0)
1255                 goto err_trans;
1256
1257         list_add_tail_rcu(&table->list, &nft_net->tables);
1258         return 0;
1259 err_trans:
1260         rhltable_destroy(&table->chains_ht);
1261 err_chain_ht:
1262         kfree(table->udata);
1263 err_table_udata:
1264         kfree(table->name);
1265 err_strdup:
1266         kfree(table);
1267 err_kzalloc:
1268         return err;
1269 }
1270
1271 static int nft_flush_table(struct nft_ctx *ctx)
1272 {
1273         struct nft_flowtable *flowtable, *nft;
1274         struct nft_chain *chain, *nc;
1275         struct nft_object *obj, *ne;
1276         struct nft_set *set, *ns;
1277         int err;
1278
1279         list_for_each_entry(chain, &ctx->table->chains, list) {
1280                 if (!nft_is_active_next(ctx->net, chain))
1281                         continue;
1282
1283                 if (nft_chain_is_bound(chain))
1284                         continue;
1285
1286                 ctx->chain = chain;
1287
1288                 err = nft_delrule_by_chain(ctx);
1289                 if (err < 0)
1290                         goto out;
1291         }
1292
1293         list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1294                 if (!nft_is_active_next(ctx->net, set))
1295                         continue;
1296
1297                 if (nft_set_is_anonymous(set) &&
1298                     !list_empty(&set->bindings))
1299                         continue;
1300
1301                 err = nft_delset(ctx, set);
1302                 if (err < 0)
1303                         goto out;
1304         }
1305
1306         list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1307                 if (!nft_is_active_next(ctx->net, flowtable))
1308                         continue;
1309
1310                 err = nft_delflowtable(ctx, flowtable);
1311                 if (err < 0)
1312                         goto out;
1313         }
1314
1315         list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1316                 if (!nft_is_active_next(ctx->net, obj))
1317                         continue;
1318
1319                 err = nft_delobj(ctx, obj);
1320                 if (err < 0)
1321                         goto out;
1322         }
1323
1324         list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1325                 if (!nft_is_active_next(ctx->net, chain))
1326                         continue;
1327
1328                 if (nft_chain_is_bound(chain))
1329                         continue;
1330
1331                 ctx->chain = chain;
1332
1333                 err = nft_delchain(ctx);
1334                 if (err < 0)
1335                         goto out;
1336         }
1337
1338         err = nft_deltable(ctx);
1339 out:
1340         return err;
1341 }
1342
1343 static int nft_flush(struct nft_ctx *ctx, int family)
1344 {
1345         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1346         const struct nlattr * const *nla = ctx->nla;
1347         struct nft_table *table, *nt;
1348         int err = 0;
1349
1350         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1351                 if (family != AF_UNSPEC && table->family != family)
1352                         continue;
1353
1354                 ctx->family = table->family;
1355
1356                 if (!nft_is_active_next(ctx->net, table))
1357                         continue;
1358
1359                 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1360                         continue;
1361
1362                 if (nla[NFTA_TABLE_NAME] &&
1363                     nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1364                         continue;
1365
1366                 ctx->table = table;
1367
1368                 err = nft_flush_table(ctx);
1369                 if (err < 0)
1370                         goto out;
1371         }
1372 out:
1373         return err;
1374 }
1375
1376 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1377                               const struct nlattr * const nla[])
1378 {
1379         struct netlink_ext_ack *extack = info->extack;
1380         u8 genmask = nft_genmask_next(info->net);
1381         u8 family = info->nfmsg->nfgen_family;
1382         struct net *net = info->net;
1383         const struct nlattr *attr;
1384         struct nft_table *table;
1385         struct nft_ctx ctx;
1386
1387         nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1388         if (family == AF_UNSPEC ||
1389             (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1390                 return nft_flush(&ctx, family);
1391
1392         if (nla[NFTA_TABLE_HANDLE]) {
1393                 attr = nla[NFTA_TABLE_HANDLE];
1394                 table = nft_table_lookup_byhandle(net, attr, genmask,
1395                                                   NETLINK_CB(skb).portid);
1396         } else {
1397                 attr = nla[NFTA_TABLE_NAME];
1398                 table = nft_table_lookup(net, attr, family, genmask,
1399                                          NETLINK_CB(skb).portid);
1400         }
1401
1402         if (IS_ERR(table)) {
1403                 if (PTR_ERR(table) == -ENOENT &&
1404                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1405                         return 0;
1406
1407                 NL_SET_BAD_ATTR(extack, attr);
1408                 return PTR_ERR(table);
1409         }
1410
1411         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1412             table->use > 0)
1413                 return -EBUSY;
1414
1415         ctx.family = family;
1416         ctx.table = table;
1417
1418         return nft_flush_table(&ctx);
1419 }
1420
1421 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1422 {
1423         if (WARN_ON(ctx->table->use > 0))
1424                 return;
1425
1426         rhltable_destroy(&ctx->table->chains_ht);
1427         kfree(ctx->table->name);
1428         kfree(ctx->table->udata);
1429         kfree(ctx->table);
1430 }
1431
1432 void nft_register_chain_type(const struct nft_chain_type *ctype)
1433 {
1434         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1435         if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1436                 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1437                 return;
1438         }
1439         chain_type[ctype->family][ctype->type] = ctype;
1440         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1441 }
1442 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1443
1444 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1445 {
1446         nfnl_lock(NFNL_SUBSYS_NFTABLES);
1447         chain_type[ctype->family][ctype->type] = NULL;
1448         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1449 }
1450 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1451
1452 /*
1453  * Chains
1454  */
1455
1456 static struct nft_chain *
1457 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1458 {
1459         struct nft_chain *chain;
1460
1461         list_for_each_entry(chain, &table->chains, list) {
1462                 if (chain->handle == handle &&
1463                     nft_active_genmask(chain, genmask))
1464                         return chain;
1465         }
1466
1467         return ERR_PTR(-ENOENT);
1468 }
1469
1470 static bool lockdep_commit_lock_is_held(const struct net *net)
1471 {
1472 #ifdef CONFIG_PROVE_LOCKING
1473         struct nftables_pernet *nft_net = nft_pernet(net);
1474
1475         return lockdep_is_held(&nft_net->commit_mutex);
1476 #else
1477         return true;
1478 #endif
1479 }
1480
1481 static struct nft_chain *nft_chain_lookup(struct net *net,
1482                                           struct nft_table *table,
1483                                           const struct nlattr *nla, u8 genmask)
1484 {
1485         char search[NFT_CHAIN_MAXNAMELEN + 1];
1486         struct rhlist_head *tmp, *list;
1487         struct nft_chain *chain;
1488
1489         if (nla == NULL)
1490                 return ERR_PTR(-EINVAL);
1491
1492         nla_strscpy(search, nla, sizeof(search));
1493
1494         WARN_ON(!rcu_read_lock_held() &&
1495                 !lockdep_commit_lock_is_held(net));
1496
1497         chain = ERR_PTR(-ENOENT);
1498         rcu_read_lock();
1499         list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1500         if (!list)
1501                 goto out_unlock;
1502
1503         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1504                 if (nft_active_genmask(chain, genmask))
1505                         goto out_unlock;
1506         }
1507         chain = ERR_PTR(-ENOENT);
1508 out_unlock:
1509         rcu_read_unlock();
1510         return chain;
1511 }
1512
1513 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1514         [NFTA_CHAIN_TABLE]      = { .type = NLA_STRING,
1515                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
1516         [NFTA_CHAIN_HANDLE]     = { .type = NLA_U64 },
1517         [NFTA_CHAIN_NAME]       = { .type = NLA_STRING,
1518                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
1519         [NFTA_CHAIN_HOOK]       = { .type = NLA_NESTED },
1520         [NFTA_CHAIN_POLICY]     = { .type = NLA_U32 },
1521         [NFTA_CHAIN_TYPE]       = { .type = NLA_STRING,
1522                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
1523         [NFTA_CHAIN_COUNTERS]   = { .type = NLA_NESTED },
1524         [NFTA_CHAIN_FLAGS]      = { .type = NLA_U32 },
1525         [NFTA_CHAIN_ID]         = { .type = NLA_U32 },
1526         [NFTA_CHAIN_USERDATA]   = { .type = NLA_BINARY,
1527                                     .len = NFT_USERDATA_MAXLEN },
1528 };
1529
1530 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1531         [NFTA_HOOK_HOOKNUM]     = { .type = NLA_U32 },
1532         [NFTA_HOOK_PRIORITY]    = { .type = NLA_U32 },
1533         [NFTA_HOOK_DEV]         = { .type = NLA_STRING,
1534                                     .len = IFNAMSIZ - 1 },
1535 };
1536
1537 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1538 {
1539         struct nft_stats *cpu_stats, total;
1540         struct nlattr *nest;
1541         unsigned int seq;
1542         u64 pkts, bytes;
1543         int cpu;
1544
1545         if (!stats)
1546                 return 0;
1547
1548         memset(&total, 0, sizeof(total));
1549         for_each_possible_cpu(cpu) {
1550                 cpu_stats = per_cpu_ptr(stats, cpu);
1551                 do {
1552                         seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1553                         pkts = cpu_stats->pkts;
1554                         bytes = cpu_stats->bytes;
1555                 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1556                 total.pkts += pkts;
1557                 total.bytes += bytes;
1558         }
1559         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1560         if (nest == NULL)
1561                 goto nla_put_failure;
1562
1563         if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1564                          NFTA_COUNTER_PAD) ||
1565             nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1566                          NFTA_COUNTER_PAD))
1567                 goto nla_put_failure;
1568
1569         nla_nest_end(skb, nest);
1570         return 0;
1571
1572 nla_put_failure:
1573         return -ENOSPC;
1574 }
1575
1576 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1577                                    const struct nft_base_chain *basechain)
1578 {
1579         const struct nf_hook_ops *ops = &basechain->ops;
1580         struct nft_hook *hook, *first = NULL;
1581         struct nlattr *nest, *nest_devs;
1582         int n = 0;
1583
1584         nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1585         if (nest == NULL)
1586                 goto nla_put_failure;
1587         if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1588                 goto nla_put_failure;
1589         if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1590                 goto nla_put_failure;
1591
1592         if (nft_base_chain_netdev(family, ops->hooknum)) {
1593                 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1594                 list_for_each_entry(hook, &basechain->hook_list, list) {
1595                         if (!first)
1596                                 first = hook;
1597
1598                         if (nla_put_string(skb, NFTA_DEVICE_NAME,
1599                                            hook->ops.dev->name))
1600                                 goto nla_put_failure;
1601                         n++;
1602                 }
1603                 nla_nest_end(skb, nest_devs);
1604
1605                 if (n == 1 &&
1606                     nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1607                         goto nla_put_failure;
1608         }
1609         nla_nest_end(skb, nest);
1610
1611         return 0;
1612 nla_put_failure:
1613         return -1;
1614 }
1615
1616 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1617                                      u32 portid, u32 seq, int event, u32 flags,
1618                                      int family, const struct nft_table *table,
1619                                      const struct nft_chain *chain)
1620 {
1621         struct nlmsghdr *nlh;
1622
1623         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1624         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1625                            NFNETLINK_V0, nft_base_seq(net));
1626         if (!nlh)
1627                 goto nla_put_failure;
1628
1629         if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1630                 goto nla_put_failure;
1631         if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1632                          NFTA_CHAIN_PAD))
1633                 goto nla_put_failure;
1634         if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1635                 goto nla_put_failure;
1636
1637         if (nft_is_base_chain(chain)) {
1638                 const struct nft_base_chain *basechain = nft_base_chain(chain);
1639                 struct nft_stats __percpu *stats;
1640
1641                 if (nft_dump_basechain_hook(skb, family, basechain))
1642                         goto nla_put_failure;
1643
1644                 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1645                                  htonl(basechain->policy)))
1646                         goto nla_put_failure;
1647
1648                 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1649                         goto nla_put_failure;
1650
1651                 stats = rcu_dereference_check(basechain->stats,
1652                                               lockdep_commit_lock_is_held(net));
1653                 if (nft_dump_stats(skb, stats))
1654                         goto nla_put_failure;
1655         }
1656
1657         if (chain->flags &&
1658             nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1659                 goto nla_put_failure;
1660
1661         if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1662                 goto nla_put_failure;
1663
1664         if (chain->udata &&
1665             nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1666                 goto nla_put_failure;
1667
1668         nlmsg_end(skb, nlh);
1669         return 0;
1670
1671 nla_put_failure:
1672         nlmsg_trim(skb, nlh);
1673         return -1;
1674 }
1675
1676 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1677 {
1678         struct nftables_pernet *nft_net;
1679         struct sk_buff *skb;
1680         u16 flags = 0;
1681         int err;
1682
1683         if (!ctx->report &&
1684             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1685                 return;
1686
1687         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1688         if (skb == NULL)
1689                 goto err;
1690
1691         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1692                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1693
1694         err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1695                                         event, flags, ctx->family, ctx->table,
1696                                         ctx->chain);
1697         if (err < 0) {
1698                 kfree_skb(skb);
1699                 goto err;
1700         }
1701
1702         nft_net = nft_pernet(ctx->net);
1703         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1704         return;
1705 err:
1706         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1707 }
1708
1709 static int nf_tables_dump_chains(struct sk_buff *skb,
1710                                  struct netlink_callback *cb)
1711 {
1712         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1713         unsigned int idx = 0, s_idx = cb->args[0];
1714         struct net *net = sock_net(skb->sk);
1715         int family = nfmsg->nfgen_family;
1716         struct nftables_pernet *nft_net;
1717         const struct nft_table *table;
1718         const struct nft_chain *chain;
1719
1720         rcu_read_lock();
1721         nft_net = nft_pernet(net);
1722         cb->seq = READ_ONCE(nft_net->base_seq);
1723
1724         list_for_each_entry_rcu(table, &nft_net->tables, list) {
1725                 if (family != NFPROTO_UNSPEC && family != table->family)
1726                         continue;
1727
1728                 list_for_each_entry_rcu(chain, &table->chains, list) {
1729                         if (idx < s_idx)
1730                                 goto cont;
1731                         if (idx > s_idx)
1732                                 memset(&cb->args[1], 0,
1733                                        sizeof(cb->args) - sizeof(cb->args[0]));
1734                         if (!nft_is_active(net, chain))
1735                                 continue;
1736                         if (nf_tables_fill_chain_info(skb, net,
1737                                                       NETLINK_CB(cb->skb).portid,
1738                                                       cb->nlh->nlmsg_seq,
1739                                                       NFT_MSG_NEWCHAIN,
1740                                                       NLM_F_MULTI,
1741                                                       table->family, table,
1742                                                       chain) < 0)
1743                                 goto done;
1744
1745                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1746 cont:
1747                         idx++;
1748                 }
1749         }
1750 done:
1751         rcu_read_unlock();
1752         cb->args[0] = idx;
1753         return skb->len;
1754 }
1755
1756 /* called with rcu_read_lock held */
1757 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1758                               const struct nlattr * const nla[])
1759 {
1760         struct netlink_ext_ack *extack = info->extack;
1761         u8 genmask = nft_genmask_cur(info->net);
1762         u8 family = info->nfmsg->nfgen_family;
1763         const struct nft_chain *chain;
1764         struct net *net = info->net;
1765         struct nft_table *table;
1766         struct sk_buff *skb2;
1767         int err;
1768
1769         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1770                 struct netlink_dump_control c = {
1771                         .dump = nf_tables_dump_chains,
1772                         .module = THIS_MODULE,
1773                 };
1774
1775                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1776         }
1777
1778         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1779         if (IS_ERR(table)) {
1780                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1781                 return PTR_ERR(table);
1782         }
1783
1784         chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1785         if (IS_ERR(chain)) {
1786                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1787                 return PTR_ERR(chain);
1788         }
1789
1790         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1791         if (!skb2)
1792                 return -ENOMEM;
1793
1794         err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1795                                         info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1796                                         0, family, table, chain);
1797         if (err < 0)
1798                 goto err_fill_chain_info;
1799
1800         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1801
1802 err_fill_chain_info:
1803         kfree_skb(skb2);
1804         return err;
1805 }
1806
1807 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1808         [NFTA_COUNTER_PACKETS]  = { .type = NLA_U64 },
1809         [NFTA_COUNTER_BYTES]    = { .type = NLA_U64 },
1810 };
1811
1812 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1813 {
1814         struct nlattr *tb[NFTA_COUNTER_MAX+1];
1815         struct nft_stats __percpu *newstats;
1816         struct nft_stats *stats;
1817         int err;
1818
1819         err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1820                                           nft_counter_policy, NULL);
1821         if (err < 0)
1822                 return ERR_PTR(err);
1823
1824         if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1825                 return ERR_PTR(-EINVAL);
1826
1827         newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1828         if (newstats == NULL)
1829                 return ERR_PTR(-ENOMEM);
1830
1831         /* Restore old counters on this cpu, no problem. Per-cpu statistics
1832          * are not exposed to userspace.
1833          */
1834         preempt_disable();
1835         stats = this_cpu_ptr(newstats);
1836         stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1837         stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1838         preempt_enable();
1839
1840         return newstats;
1841 }
1842
1843 static void nft_chain_stats_replace(struct nft_trans *trans)
1844 {
1845         struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1846
1847         if (!nft_trans_chain_stats(trans))
1848                 return;
1849
1850         nft_trans_chain_stats(trans) =
1851                 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1852                                     lockdep_commit_lock_is_held(trans->ctx.net));
1853
1854         if (!nft_trans_chain_stats(trans))
1855                 static_branch_inc(&nft_counters_enabled);
1856 }
1857
1858 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1859 {
1860         struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1861         struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1862
1863         if (g0 != g1)
1864                 kvfree(g1);
1865         kvfree(g0);
1866
1867         /* should be NULL either via abort or via successful commit */
1868         WARN_ON_ONCE(chain->blob_next);
1869         kvfree(chain->blob_next);
1870 }
1871
1872 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1873 {
1874         struct nft_chain *chain = ctx->chain;
1875         struct nft_hook *hook, *next;
1876
1877         if (WARN_ON(chain->use > 0))
1878                 return;
1879
1880         /* no concurrent access possible anymore */
1881         nf_tables_chain_free_chain_rules(chain);
1882
1883         if (nft_is_base_chain(chain)) {
1884                 struct nft_base_chain *basechain = nft_base_chain(chain);
1885
1886                 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1887                         list_for_each_entry_safe(hook, next,
1888                                                  &basechain->hook_list, list) {
1889                                 list_del_rcu(&hook->list);
1890                                 kfree_rcu(hook, rcu);
1891                         }
1892                 }
1893                 module_put(basechain->type->owner);
1894                 if (rcu_access_pointer(basechain->stats)) {
1895                         static_branch_dec(&nft_counters_enabled);
1896                         free_percpu(rcu_dereference_raw(basechain->stats));
1897                 }
1898                 kfree(chain->name);
1899                 kfree(chain->udata);
1900                 kfree(basechain);
1901         } else {
1902                 kfree(chain->name);
1903                 kfree(chain->udata);
1904                 kfree(chain);
1905         }
1906 }
1907
1908 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1909                                               const struct nlattr *attr)
1910 {
1911         struct net_device *dev;
1912         char ifname[IFNAMSIZ];
1913         struct nft_hook *hook;
1914         int err;
1915
1916         hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1917         if (!hook) {
1918                 err = -ENOMEM;
1919                 goto err_hook_alloc;
1920         }
1921
1922         nla_strscpy(ifname, attr, IFNAMSIZ);
1923         /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1924          * indirectly serializing all the other holders of the commit_mutex with
1925          * the rtnl_mutex.
1926          */
1927         dev = __dev_get_by_name(net, ifname);
1928         if (!dev) {
1929                 err = -ENOENT;
1930                 goto err_hook_dev;
1931         }
1932         hook->ops.dev = dev;
1933
1934         return hook;
1935
1936 err_hook_dev:
1937         kfree(hook);
1938 err_hook_alloc:
1939         return ERR_PTR(err);
1940 }
1941
1942 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1943                                            const struct nft_hook *this)
1944 {
1945         struct nft_hook *hook;
1946
1947         list_for_each_entry(hook, hook_list, list) {
1948                 if (this->ops.dev == hook->ops.dev)
1949                         return hook;
1950         }
1951
1952         return NULL;
1953 }
1954
1955 static int nf_tables_parse_netdev_hooks(struct net *net,
1956                                         const struct nlattr *attr,
1957                                         struct list_head *hook_list,
1958                                         struct netlink_ext_ack *extack)
1959 {
1960         struct nft_hook *hook, *next;
1961         const struct nlattr *tmp;
1962         int rem, n = 0, err;
1963
1964         nla_for_each_nested(tmp, attr, rem) {
1965                 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1966                         err = -EINVAL;
1967                         goto err_hook;
1968                 }
1969
1970                 hook = nft_netdev_hook_alloc(net, tmp);
1971                 if (IS_ERR(hook)) {
1972                         NL_SET_BAD_ATTR(extack, tmp);
1973                         err = PTR_ERR(hook);
1974                         goto err_hook;
1975                 }
1976                 if (nft_hook_list_find(hook_list, hook)) {
1977                         NL_SET_BAD_ATTR(extack, tmp);
1978                         kfree(hook);
1979                         err = -EEXIST;
1980                         goto err_hook;
1981                 }
1982                 list_add_tail(&hook->list, hook_list);
1983                 n++;
1984
1985                 if (n == NFT_NETDEVICE_MAX) {
1986                         err = -EFBIG;
1987                         goto err_hook;
1988                 }
1989         }
1990
1991         return 0;
1992
1993 err_hook:
1994         list_for_each_entry_safe(hook, next, hook_list, list) {
1995                 list_del(&hook->list);
1996                 kfree(hook);
1997         }
1998         return err;
1999 }
2000
2001 struct nft_chain_hook {
2002         u32                             num;
2003         s32                             priority;
2004         const struct nft_chain_type     *type;
2005         struct list_head                list;
2006 };
2007
2008 static int nft_chain_parse_netdev(struct net *net,
2009                                   struct nlattr *tb[],
2010                                   struct list_head *hook_list,
2011                                   struct netlink_ext_ack *extack)
2012 {
2013         struct nft_hook *hook;
2014         int err;
2015
2016         if (tb[NFTA_HOOK_DEV]) {
2017                 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2018                 if (IS_ERR(hook)) {
2019                         NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2020                         return PTR_ERR(hook);
2021                 }
2022
2023                 list_add_tail(&hook->list, hook_list);
2024         } else if (tb[NFTA_HOOK_DEVS]) {
2025                 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2026                                                    hook_list, extack);
2027                 if (err < 0)
2028                         return err;
2029
2030                 if (list_empty(hook_list))
2031                         return -EINVAL;
2032         } else {
2033                 return -EINVAL;
2034         }
2035
2036         return 0;
2037 }
2038
2039 static int nft_chain_parse_hook(struct net *net,
2040                                 const struct nlattr * const nla[],
2041                                 struct nft_chain_hook *hook, u8 family,
2042                                 struct netlink_ext_ack *extack, bool autoload)
2043 {
2044         struct nftables_pernet *nft_net = nft_pernet(net);
2045         struct nlattr *ha[NFTA_HOOK_MAX + 1];
2046         const struct nft_chain_type *type;
2047         int err;
2048
2049         lockdep_assert_held(&nft_net->commit_mutex);
2050         lockdep_nfnl_nft_mutex_not_held();
2051
2052         err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2053                                           nla[NFTA_CHAIN_HOOK],
2054                                           nft_hook_policy, NULL);
2055         if (err < 0)
2056                 return err;
2057
2058         if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2059             ha[NFTA_HOOK_PRIORITY] == NULL)
2060                 return -EINVAL;
2061
2062         hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2063         hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2064
2065         type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2066         if (!type)
2067                 return -EOPNOTSUPP;
2068
2069         if (nla[NFTA_CHAIN_TYPE]) {
2070                 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2071                                                    family, autoload);
2072                 if (IS_ERR(type)) {
2073                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2074                         return PTR_ERR(type);
2075                 }
2076         }
2077         if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2078                 return -EOPNOTSUPP;
2079
2080         if (type->type == NFT_CHAIN_T_NAT &&
2081             hook->priority <= NF_IP_PRI_CONNTRACK)
2082                 return -EOPNOTSUPP;
2083
2084         if (!try_module_get(type->owner)) {
2085                 if (nla[NFTA_CHAIN_TYPE])
2086                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2087                 return -ENOENT;
2088         }
2089
2090         hook->type = type;
2091
2092         INIT_LIST_HEAD(&hook->list);
2093         if (nft_base_chain_netdev(family, hook->num)) {
2094                 err = nft_chain_parse_netdev(net, ha, &hook->list, extack);
2095                 if (err < 0) {
2096                         module_put(type->owner);
2097                         return err;
2098                 }
2099         } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2100                 module_put(type->owner);
2101                 return -EOPNOTSUPP;
2102         }
2103
2104         return 0;
2105 }
2106
2107 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2108 {
2109         struct nft_hook *h, *next;
2110
2111         list_for_each_entry_safe(h, next, &hook->list, list) {
2112                 list_del(&h->list);
2113                 kfree(h);
2114         }
2115         module_put(hook->type->owner);
2116 }
2117
2118 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2119 {
2120         struct nft_rule_dp_last *lrule;
2121
2122         BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2123
2124         lrule = (struct nft_rule_dp_last *)ptr;
2125         lrule->end.is_last = 1;
2126         lrule->chain = chain;
2127         /* blob size does not include the trailer rule */
2128 }
2129
2130 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2131                                                          unsigned int size)
2132 {
2133         struct nft_rule_blob *blob;
2134
2135         if (size > INT_MAX)
2136                 return NULL;
2137
2138         size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2139
2140         blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2141         if (!blob)
2142                 return NULL;
2143
2144         blob->size = 0;
2145         nft_last_rule(chain, blob->data);
2146
2147         return blob;
2148 }
2149
2150 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2151                                     const struct nft_chain_hook *hook,
2152                                     struct nft_chain *chain)
2153 {
2154         ops->pf                 = family;
2155         ops->hooknum            = hook->num;
2156         ops->priority           = hook->priority;
2157         ops->priv               = chain;
2158         ops->hook               = hook->type->hooks[ops->hooknum];
2159         ops->hook_ops_type      = NF_HOOK_OP_NF_TABLES;
2160 }
2161
2162 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2163                               struct nft_chain_hook *hook, u32 flags)
2164 {
2165         struct nft_chain *chain;
2166         struct nft_hook *h;
2167
2168         basechain->type = hook->type;
2169         INIT_LIST_HEAD(&basechain->hook_list);
2170         chain = &basechain->chain;
2171
2172         if (nft_base_chain_netdev(family, hook->num)) {
2173                 list_splice_init(&hook->list, &basechain->hook_list);
2174                 list_for_each_entry(h, &basechain->hook_list, list)
2175                         nft_basechain_hook_init(&h->ops, family, hook, chain);
2176
2177                 basechain->ops.hooknum  = hook->num;
2178                 basechain->ops.priority = hook->priority;
2179         } else {
2180                 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2181         }
2182
2183         chain->flags |= NFT_CHAIN_BASE | flags;
2184         basechain->policy = NF_ACCEPT;
2185         if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2186             !nft_chain_offload_support(basechain)) {
2187                 list_splice_init(&basechain->hook_list, &hook->list);
2188                 return -EOPNOTSUPP;
2189         }
2190
2191         flow_block_init(&basechain->flow_block);
2192
2193         return 0;
2194 }
2195
2196 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2197 {
2198         int err;
2199
2200         err = rhltable_insert_key(&table->chains_ht, chain->name,
2201                                   &chain->rhlhead, nft_chain_ht_params);
2202         if (err)
2203                 return err;
2204
2205         list_add_tail_rcu(&chain->list, &table->chains);
2206
2207         return 0;
2208 }
2209
2210 static u64 chain_id;
2211
2212 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2213                               u8 policy, u32 flags,
2214                               struct netlink_ext_ack *extack)
2215 {
2216         const struct nlattr * const *nla = ctx->nla;
2217         struct nft_table *table = ctx->table;
2218         struct nft_base_chain *basechain;
2219         struct net *net = ctx->net;
2220         char name[NFT_NAME_MAXLEN];
2221         struct nft_rule_blob *blob;
2222         struct nft_trans *trans;
2223         struct nft_chain *chain;
2224         int err;
2225
2226         if (table->use == UINT_MAX)
2227                 return -EOVERFLOW;
2228
2229         if (nla[NFTA_CHAIN_HOOK]) {
2230                 struct nft_stats __percpu *stats = NULL;
2231                 struct nft_chain_hook hook;
2232
2233                 if (flags & NFT_CHAIN_BINDING)
2234                         return -EOPNOTSUPP;
2235
2236                 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2237                                            true);
2238                 if (err < 0)
2239                         return err;
2240
2241                 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2242                 if (basechain == NULL) {
2243                         nft_chain_release_hook(&hook);
2244                         return -ENOMEM;
2245                 }
2246                 chain = &basechain->chain;
2247
2248                 if (nla[NFTA_CHAIN_COUNTERS]) {
2249                         stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2250                         if (IS_ERR(stats)) {
2251                                 nft_chain_release_hook(&hook);
2252                                 kfree(basechain);
2253                                 return PTR_ERR(stats);
2254                         }
2255                         rcu_assign_pointer(basechain->stats, stats);
2256                 }
2257
2258                 err = nft_basechain_init(basechain, family, &hook, flags);
2259                 if (err < 0) {
2260                         nft_chain_release_hook(&hook);
2261                         kfree(basechain);
2262                         free_percpu(stats);
2263                         return err;
2264                 }
2265                 if (stats)
2266                         static_branch_inc(&nft_counters_enabled);
2267         } else {
2268                 if (flags & NFT_CHAIN_BASE)
2269                         return -EINVAL;
2270                 if (flags & NFT_CHAIN_HW_OFFLOAD)
2271                         return -EOPNOTSUPP;
2272
2273                 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2274                 if (chain == NULL)
2275                         return -ENOMEM;
2276
2277                 chain->flags = flags;
2278         }
2279         ctx->chain = chain;
2280
2281         INIT_LIST_HEAD(&chain->rules);
2282         chain->handle = nf_tables_alloc_handle(table);
2283         chain->table = table;
2284
2285         if (nla[NFTA_CHAIN_NAME]) {
2286                 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2287         } else {
2288                 if (!(flags & NFT_CHAIN_BINDING)) {
2289                         err = -EINVAL;
2290                         goto err_destroy_chain;
2291                 }
2292
2293                 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2294                 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2295         }
2296
2297         if (!chain->name) {
2298                 err = -ENOMEM;
2299                 goto err_destroy_chain;
2300         }
2301
2302         if (nla[NFTA_CHAIN_USERDATA]) {
2303                 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2304                 if (chain->udata == NULL) {
2305                         err = -ENOMEM;
2306                         goto err_destroy_chain;
2307                 }
2308                 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2309         }
2310
2311         blob = nf_tables_chain_alloc_rules(chain, 0);
2312         if (!blob) {
2313                 err = -ENOMEM;
2314                 goto err_destroy_chain;
2315         }
2316
2317         RCU_INIT_POINTER(chain->blob_gen_0, blob);
2318         RCU_INIT_POINTER(chain->blob_gen_1, blob);
2319
2320         err = nf_tables_register_hook(net, table, chain);
2321         if (err < 0)
2322                 goto err_destroy_chain;
2323
2324         trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2325         if (IS_ERR(trans)) {
2326                 err = PTR_ERR(trans);
2327                 goto err_unregister_hook;
2328         }
2329
2330         nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2331         if (nft_is_base_chain(chain))
2332                 nft_trans_chain_policy(trans) = policy;
2333
2334         err = nft_chain_add(table, chain);
2335         if (err < 0) {
2336                 nft_trans_destroy(trans);
2337                 goto err_unregister_hook;
2338         }
2339
2340         table->use++;
2341
2342         return 0;
2343 err_unregister_hook:
2344         nf_tables_unregister_hook(net, table, chain);
2345 err_destroy_chain:
2346         nf_tables_chain_destroy(ctx);
2347
2348         return err;
2349 }
2350
2351 static bool nft_hook_list_equal(struct list_head *hook_list1,
2352                                 struct list_head *hook_list2)
2353 {
2354         struct nft_hook *hook;
2355         int n = 0, m = 0;
2356
2357         n = 0;
2358         list_for_each_entry(hook, hook_list2, list) {
2359                 if (!nft_hook_list_find(hook_list1, hook))
2360                         return false;
2361
2362                 n++;
2363         }
2364         list_for_each_entry(hook, hook_list1, list)
2365                 m++;
2366
2367         return n == m;
2368 }
2369
2370 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2371                               u32 flags, const struct nlattr *attr,
2372                               struct netlink_ext_ack *extack)
2373 {
2374         const struct nlattr * const *nla = ctx->nla;
2375         struct nft_table *table = ctx->table;
2376         struct nft_chain *chain = ctx->chain;
2377         struct nft_base_chain *basechain;
2378         struct nft_stats *stats = NULL;
2379         struct nft_chain_hook hook;
2380         struct nf_hook_ops *ops;
2381         struct nft_trans *trans;
2382         int err;
2383
2384         if (chain->flags ^ flags)
2385                 return -EOPNOTSUPP;
2386
2387         if (nla[NFTA_CHAIN_HOOK]) {
2388                 if (!nft_is_base_chain(chain)) {
2389                         NL_SET_BAD_ATTR(extack, attr);
2390                         return -EEXIST;
2391                 }
2392                 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2393                                            extack, false);
2394                 if (err < 0)
2395                         return err;
2396
2397                 basechain = nft_base_chain(chain);
2398                 if (basechain->type != hook.type) {
2399                         nft_chain_release_hook(&hook);
2400                         NL_SET_BAD_ATTR(extack, attr);
2401                         return -EEXIST;
2402                 }
2403
2404                 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2405                         if (!nft_hook_list_equal(&basechain->hook_list,
2406                                                  &hook.list)) {
2407                                 nft_chain_release_hook(&hook);
2408                                 NL_SET_BAD_ATTR(extack, attr);
2409                                 return -EEXIST;
2410                         }
2411                 } else {
2412                         ops = &basechain->ops;
2413                         if (ops->hooknum != hook.num ||
2414                             ops->priority != hook.priority) {
2415                                 nft_chain_release_hook(&hook);
2416                                 NL_SET_BAD_ATTR(extack, attr);
2417                                 return -EEXIST;
2418                         }
2419                 }
2420                 nft_chain_release_hook(&hook);
2421         }
2422
2423         if (nla[NFTA_CHAIN_HANDLE] &&
2424             nla[NFTA_CHAIN_NAME]) {
2425                 struct nft_chain *chain2;
2426
2427                 chain2 = nft_chain_lookup(ctx->net, table,
2428                                           nla[NFTA_CHAIN_NAME], genmask);
2429                 if (!IS_ERR(chain2)) {
2430                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2431                         return -EEXIST;
2432                 }
2433         }
2434
2435         if (nla[NFTA_CHAIN_COUNTERS]) {
2436                 if (!nft_is_base_chain(chain))
2437                         return -EOPNOTSUPP;
2438
2439                 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2440                 if (IS_ERR(stats))
2441                         return PTR_ERR(stats);
2442         }
2443
2444         err = -ENOMEM;
2445         trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2446                                 sizeof(struct nft_trans_chain));
2447         if (trans == NULL)
2448                 goto err;
2449
2450         nft_trans_chain_stats(trans) = stats;
2451         nft_trans_chain_update(trans) = true;
2452
2453         if (nla[NFTA_CHAIN_POLICY])
2454                 nft_trans_chain_policy(trans) = policy;
2455         else
2456                 nft_trans_chain_policy(trans) = -1;
2457
2458         if (nla[NFTA_CHAIN_HANDLE] &&
2459             nla[NFTA_CHAIN_NAME]) {
2460                 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2461                 struct nft_trans *tmp;
2462                 char *name;
2463
2464                 err = -ENOMEM;
2465                 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2466                 if (!name)
2467                         goto err;
2468
2469                 err = -EEXIST;
2470                 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2471                         if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2472                             tmp->ctx.table == table &&
2473                             nft_trans_chain_update(tmp) &&
2474                             nft_trans_chain_name(tmp) &&
2475                             strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2476                                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2477                                 kfree(name);
2478                                 goto err;
2479                         }
2480                 }
2481
2482                 nft_trans_chain_name(trans) = name;
2483         }
2484         nft_trans_commit_list_add_tail(ctx->net, trans);
2485
2486         return 0;
2487 err:
2488         free_percpu(stats);
2489         kfree(trans);
2490         return err;
2491 }
2492
2493 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2494                                                const struct nft_table *table,
2495                                                const struct nlattr *nla)
2496 {
2497         struct nftables_pernet *nft_net = nft_pernet(net);
2498         u32 id = ntohl(nla_get_be32(nla));
2499         struct nft_trans *trans;
2500
2501         list_for_each_entry(trans, &nft_net->commit_list, list) {
2502                 struct nft_chain *chain = trans->ctx.chain;
2503
2504                 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2505                     chain->table == table &&
2506                     id == nft_trans_chain_id(trans))
2507                         return chain;
2508         }
2509         return ERR_PTR(-ENOENT);
2510 }
2511
2512 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2513                               const struct nlattr * const nla[])
2514 {
2515         struct nftables_pernet *nft_net = nft_pernet(info->net);
2516         struct netlink_ext_ack *extack = info->extack;
2517         u8 genmask = nft_genmask_next(info->net);
2518         u8 family = info->nfmsg->nfgen_family;
2519         struct nft_chain *chain = NULL;
2520         struct net *net = info->net;
2521         const struct nlattr *attr;
2522         struct nft_table *table;
2523         u8 policy = NF_ACCEPT;
2524         struct nft_ctx ctx;
2525         u64 handle = 0;
2526         u32 flags = 0;
2527
2528         lockdep_assert_held(&nft_net->commit_mutex);
2529
2530         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2531                                  NETLINK_CB(skb).portid);
2532         if (IS_ERR(table)) {
2533                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2534                 return PTR_ERR(table);
2535         }
2536
2537         chain = NULL;
2538         attr = nla[NFTA_CHAIN_NAME];
2539
2540         if (nla[NFTA_CHAIN_HANDLE]) {
2541                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2542                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2543                 if (IS_ERR(chain)) {
2544                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2545                         return PTR_ERR(chain);
2546                 }
2547                 attr = nla[NFTA_CHAIN_HANDLE];
2548         } else if (nla[NFTA_CHAIN_NAME]) {
2549                 chain = nft_chain_lookup(net, table, attr, genmask);
2550                 if (IS_ERR(chain)) {
2551                         if (PTR_ERR(chain) != -ENOENT) {
2552                                 NL_SET_BAD_ATTR(extack, attr);
2553                                 return PTR_ERR(chain);
2554                         }
2555                         chain = NULL;
2556                 }
2557         } else if (!nla[NFTA_CHAIN_ID]) {
2558                 return -EINVAL;
2559         }
2560
2561         if (nla[NFTA_CHAIN_POLICY]) {
2562                 if (chain != NULL &&
2563                     !nft_is_base_chain(chain)) {
2564                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2565                         return -EOPNOTSUPP;
2566                 }
2567
2568                 if (chain == NULL &&
2569                     nla[NFTA_CHAIN_HOOK] == NULL) {
2570                         NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2571                         return -EOPNOTSUPP;
2572                 }
2573
2574                 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2575                 switch (policy) {
2576                 case NF_DROP:
2577                 case NF_ACCEPT:
2578                         break;
2579                 default:
2580                         return -EINVAL;
2581                 }
2582         }
2583
2584         if (nla[NFTA_CHAIN_FLAGS])
2585                 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2586         else if (chain)
2587                 flags = chain->flags;
2588
2589         if (flags & ~NFT_CHAIN_FLAGS)
2590                 return -EOPNOTSUPP;
2591
2592         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2593
2594         if (chain != NULL) {
2595                 if (chain->flags & NFT_CHAIN_BINDING)
2596                         return -EINVAL;
2597
2598                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2599                         NL_SET_BAD_ATTR(extack, attr);
2600                         return -EEXIST;
2601                 }
2602                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2603                         return -EOPNOTSUPP;
2604
2605                 flags |= chain->flags & NFT_CHAIN_BASE;
2606                 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2607                                           extack);
2608         }
2609
2610         return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2611 }
2612
2613 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2614                               const struct nlattr * const nla[])
2615 {
2616         struct netlink_ext_ack *extack = info->extack;
2617         u8 genmask = nft_genmask_next(info->net);
2618         u8 family = info->nfmsg->nfgen_family;
2619         struct net *net = info->net;
2620         const struct nlattr *attr;
2621         struct nft_table *table;
2622         struct nft_chain *chain;
2623         struct nft_rule *rule;
2624         struct nft_ctx ctx;
2625         u64 handle;
2626         u32 use;
2627         int err;
2628
2629         table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2630                                  NETLINK_CB(skb).portid);
2631         if (IS_ERR(table)) {
2632                 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2633                 return PTR_ERR(table);
2634         }
2635
2636         if (nla[NFTA_CHAIN_HANDLE]) {
2637                 attr = nla[NFTA_CHAIN_HANDLE];
2638                 handle = be64_to_cpu(nla_get_be64(attr));
2639                 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2640         } else {
2641                 attr = nla[NFTA_CHAIN_NAME];
2642                 chain = nft_chain_lookup(net, table, attr, genmask);
2643         }
2644         if (IS_ERR(chain)) {
2645                 if (PTR_ERR(chain) == -ENOENT &&
2646                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2647                         return 0;
2648
2649                 NL_SET_BAD_ATTR(extack, attr);
2650                 return PTR_ERR(chain);
2651         }
2652
2653         if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2654             chain->use > 0)
2655                 return -EBUSY;
2656
2657         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2658
2659         use = chain->use;
2660         list_for_each_entry(rule, &chain->rules, list) {
2661                 if (!nft_is_active_next(net, rule))
2662                         continue;
2663                 use--;
2664
2665                 err = nft_delrule(&ctx, rule);
2666                 if (err < 0)
2667                         return err;
2668         }
2669
2670         /* There are rules and elements that are still holding references to us,
2671          * we cannot do a recursive removal in this case.
2672          */
2673         if (use > 0) {
2674                 NL_SET_BAD_ATTR(extack, attr);
2675                 return -EBUSY;
2676         }
2677
2678         return nft_delchain(&ctx);
2679 }
2680
2681 /*
2682  * Expressions
2683  */
2684
2685 /**
2686  *      nft_register_expr - register nf_tables expr type
2687  *      @type: expr type
2688  *
2689  *      Registers the expr type for use with nf_tables. Returns zero on
2690  *      success or a negative errno code otherwise.
2691  */
2692 int nft_register_expr(struct nft_expr_type *type)
2693 {
2694         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2695         if (type->family == NFPROTO_UNSPEC)
2696                 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2697         else
2698                 list_add_rcu(&type->list, &nf_tables_expressions);
2699         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2700         return 0;
2701 }
2702 EXPORT_SYMBOL_GPL(nft_register_expr);
2703
2704 /**
2705  *      nft_unregister_expr - unregister nf_tables expr type
2706  *      @type: expr type
2707  *
2708  *      Unregisters the expr typefor use with nf_tables.
2709  */
2710 void nft_unregister_expr(struct nft_expr_type *type)
2711 {
2712         nfnl_lock(NFNL_SUBSYS_NFTABLES);
2713         list_del_rcu(&type->list);
2714         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2715 }
2716 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2717
2718 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2719                                                        struct nlattr *nla)
2720 {
2721         const struct nft_expr_type *type, *candidate = NULL;
2722
2723         list_for_each_entry(type, &nf_tables_expressions, list) {
2724                 if (!nla_strcmp(nla, type->name)) {
2725                         if (!type->family && !candidate)
2726                                 candidate = type;
2727                         else if (type->family == family)
2728                                 candidate = type;
2729                 }
2730         }
2731         return candidate;
2732 }
2733
2734 #ifdef CONFIG_MODULES
2735 static int nft_expr_type_request_module(struct net *net, u8 family,
2736                                         struct nlattr *nla)
2737 {
2738         if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2739                                nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2740                 return -EAGAIN;
2741
2742         return 0;
2743 }
2744 #endif
2745
2746 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2747                                                      u8 family,
2748                                                      struct nlattr *nla)
2749 {
2750         const struct nft_expr_type *type;
2751
2752         if (nla == NULL)
2753                 return ERR_PTR(-EINVAL);
2754
2755         type = __nft_expr_type_get(family, nla);
2756         if (type != NULL && try_module_get(type->owner))
2757                 return type;
2758
2759         lockdep_nfnl_nft_mutex_not_held();
2760 #ifdef CONFIG_MODULES
2761         if (type == NULL) {
2762                 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2763                         return ERR_PTR(-EAGAIN);
2764
2765                 if (nft_request_module(net, "nft-expr-%.*s",
2766                                        nla_len(nla),
2767                                        (char *)nla_data(nla)) == -EAGAIN)
2768                         return ERR_PTR(-EAGAIN);
2769         }
2770 #endif
2771         return ERR_PTR(-ENOENT);
2772 }
2773
2774 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2775         [NFTA_EXPR_NAME]        = { .type = NLA_STRING,
2776                                     .len = NFT_MODULE_AUTOLOAD_LIMIT },
2777         [NFTA_EXPR_DATA]        = { .type = NLA_NESTED },
2778 };
2779
2780 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2781                                     const struct nft_expr *expr, bool reset)
2782 {
2783         if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2784                 goto nla_put_failure;
2785
2786         if (expr->ops->dump) {
2787                 struct nlattr *data = nla_nest_start_noflag(skb,
2788                                                             NFTA_EXPR_DATA);
2789                 if (data == NULL)
2790                         goto nla_put_failure;
2791                 if (expr->ops->dump(skb, expr, reset) < 0)
2792                         goto nla_put_failure;
2793                 nla_nest_end(skb, data);
2794         }
2795
2796         return skb->len;
2797
2798 nla_put_failure:
2799         return -1;
2800 };
2801
2802 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2803                   const struct nft_expr *expr, bool reset)
2804 {
2805         struct nlattr *nest;
2806
2807         nest = nla_nest_start_noflag(skb, attr);
2808         if (!nest)
2809                 goto nla_put_failure;
2810         if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
2811                 goto nla_put_failure;
2812         nla_nest_end(skb, nest);
2813         return 0;
2814
2815 nla_put_failure:
2816         return -1;
2817 }
2818
2819 struct nft_expr_info {
2820         const struct nft_expr_ops       *ops;
2821         const struct nlattr             *attr;
2822         struct nlattr                   *tb[NFT_EXPR_MAXATTR + 1];
2823 };
2824
2825 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2826                                 const struct nlattr *nla,
2827                                 struct nft_expr_info *info)
2828 {
2829         const struct nft_expr_type *type;
2830         const struct nft_expr_ops *ops;
2831         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2832         int err;
2833
2834         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2835                                           nft_expr_policy, NULL);
2836         if (err < 0)
2837                 return err;
2838
2839         type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2840         if (IS_ERR(type))
2841                 return PTR_ERR(type);
2842
2843         if (tb[NFTA_EXPR_DATA]) {
2844                 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2845                                                   tb[NFTA_EXPR_DATA],
2846                                                   type->policy, NULL);
2847                 if (err < 0)
2848                         goto err1;
2849         } else
2850                 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2851
2852         if (type->select_ops != NULL) {
2853                 ops = type->select_ops(ctx,
2854                                        (const struct nlattr * const *)info->tb);
2855                 if (IS_ERR(ops)) {
2856                         err = PTR_ERR(ops);
2857 #ifdef CONFIG_MODULES
2858                         if (err == -EAGAIN)
2859                                 if (nft_expr_type_request_module(ctx->net,
2860                                                                  ctx->family,
2861                                                                  tb[NFTA_EXPR_NAME]) != -EAGAIN)
2862                                         err = -ENOENT;
2863 #endif
2864                         goto err1;
2865                 }
2866         } else
2867                 ops = type->ops;
2868
2869         info->attr = nla;
2870         info->ops = ops;
2871
2872         return 0;
2873
2874 err1:
2875         module_put(type->owner);
2876         return err;
2877 }
2878
2879 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
2880                          struct nft_expr_info *info)
2881 {
2882         struct nlattr *tb[NFTA_EXPR_MAX + 1];
2883         const struct nft_expr_type *type;
2884         int err;
2885
2886         err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2887                                           nft_expr_policy, NULL);
2888         if (err < 0)
2889                 return err;
2890
2891         if (!tb[NFTA_EXPR_DATA])
2892                 return -EINVAL;
2893
2894         type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
2895         if (!type)
2896                 return -ENOENT;
2897
2898         if (!type->inner_ops)
2899                 return -EOPNOTSUPP;
2900
2901         err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2902                                           tb[NFTA_EXPR_DATA],
2903                                           type->policy, NULL);
2904         if (err < 0)
2905                 goto err_nla_parse;
2906
2907         info->attr = nla;
2908         info->ops = type->inner_ops;
2909
2910         return 0;
2911
2912 err_nla_parse:
2913         return err;
2914 }
2915
2916 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2917                              const struct nft_expr_info *expr_info,
2918                              struct nft_expr *expr)
2919 {
2920         const struct nft_expr_ops *ops = expr_info->ops;
2921         int err;
2922
2923         expr->ops = ops;
2924         if (ops->init) {
2925                 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2926                 if (err < 0)
2927                         goto err1;
2928         }
2929
2930         return 0;
2931 err1:
2932         expr->ops = NULL;
2933         return err;
2934 }
2935
2936 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2937                                    struct nft_expr *expr)
2938 {
2939         const struct nft_expr_type *type = expr->ops->type;
2940
2941         if (expr->ops->destroy)
2942                 expr->ops->destroy(ctx, expr);
2943         module_put(type->owner);
2944 }
2945
2946 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2947                                       const struct nlattr *nla)
2948 {
2949         struct nft_expr_info expr_info;
2950         struct nft_expr *expr;
2951         struct module *owner;
2952         int err;
2953
2954         err = nf_tables_expr_parse(ctx, nla, &expr_info);
2955         if (err < 0)
2956                 goto err_expr_parse;
2957
2958         err = -EOPNOTSUPP;
2959         if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2960                 goto err_expr_stateful;
2961
2962         err = -ENOMEM;
2963         expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2964         if (expr == NULL)
2965                 goto err_expr_stateful;
2966
2967         err = nf_tables_newexpr(ctx, &expr_info, expr);
2968         if (err < 0)
2969                 goto err_expr_new;
2970
2971         return expr;
2972 err_expr_new:
2973         kfree(expr);
2974 err_expr_stateful:
2975         owner = expr_info.ops->type->owner;
2976         if (expr_info.ops->type->release_ops)
2977                 expr_info.ops->type->release_ops(expr_info.ops);
2978
2979         module_put(owner);
2980 err_expr_parse:
2981         return ERR_PTR(err);
2982 }
2983
2984 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2985 {
2986         int err;
2987
2988         if (src->ops->clone) {
2989                 dst->ops = src->ops;
2990                 err = src->ops->clone(dst, src);
2991                 if (err < 0)
2992                         return err;
2993         } else {
2994                 memcpy(dst, src, src->ops->size);
2995         }
2996
2997         __module_get(src->ops->type->owner);
2998
2999         return 0;
3000 }
3001
3002 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3003 {
3004         nf_tables_expr_destroy(ctx, expr);
3005         kfree(expr);
3006 }
3007
3008 /*
3009  * Rules
3010  */
3011
3012 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3013                                           u64 handle)
3014 {
3015         struct nft_rule *rule;
3016
3017         // FIXME: this sucks
3018         list_for_each_entry_rcu(rule, &chain->rules, list) {
3019                 if (handle == rule->handle)
3020                         return rule;
3021         }
3022
3023         return ERR_PTR(-ENOENT);
3024 }
3025
3026 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3027                                         const struct nlattr *nla)
3028 {
3029         if (nla == NULL)
3030                 return ERR_PTR(-EINVAL);
3031
3032         return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3033 }
3034
3035 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3036         [NFTA_RULE_TABLE]       = { .type = NLA_STRING,
3037                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
3038         [NFTA_RULE_CHAIN]       = { .type = NLA_STRING,
3039                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
3040         [NFTA_RULE_HANDLE]      = { .type = NLA_U64 },
3041         [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3042         [NFTA_RULE_COMPAT]      = { .type = NLA_NESTED },
3043         [NFTA_RULE_POSITION]    = { .type = NLA_U64 },
3044         [NFTA_RULE_USERDATA]    = { .type = NLA_BINARY,
3045                                     .len = NFT_USERDATA_MAXLEN },
3046         [NFTA_RULE_ID]          = { .type = NLA_U32 },
3047         [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3048         [NFTA_RULE_CHAIN_ID]    = { .type = NLA_U32 },
3049 };
3050
3051 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3052                                     u32 portid, u32 seq, int event,
3053                                     u32 flags, int family,
3054                                     const struct nft_table *table,
3055                                     const struct nft_chain *chain,
3056                                     const struct nft_rule *rule, u64 handle,
3057                                     bool reset)
3058 {
3059         struct nlmsghdr *nlh;
3060         const struct nft_expr *expr, *next;
3061         struct nlattr *list;
3062         u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3063
3064         nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3065                            nft_base_seq(net));
3066         if (!nlh)
3067                 goto nla_put_failure;
3068
3069         if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3070                 goto nla_put_failure;
3071         if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3072                 goto nla_put_failure;
3073         if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3074                          NFTA_RULE_PAD))
3075                 goto nla_put_failure;
3076
3077         if (event != NFT_MSG_DELRULE && handle) {
3078                 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3079                                  NFTA_RULE_PAD))
3080                         goto nla_put_failure;
3081         }
3082
3083         if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3084                 nft_flow_rule_stats(chain, rule);
3085
3086         list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3087         if (list == NULL)
3088                 goto nla_put_failure;
3089         nft_rule_for_each_expr(expr, next, rule) {
3090                 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3091                         goto nla_put_failure;
3092         }
3093         nla_nest_end(skb, list);
3094
3095         if (rule->udata) {
3096                 struct nft_userdata *udata = nft_userdata(rule);
3097                 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3098                             udata->data) < 0)
3099                         goto nla_put_failure;
3100         }
3101
3102         nlmsg_end(skb, nlh);
3103         return 0;
3104
3105 nla_put_failure:
3106         nlmsg_trim(skb, nlh);
3107         return -1;
3108 }
3109
3110 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3111                                   const struct nft_rule *rule, int event)
3112 {
3113         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3114         const struct nft_rule *prule;
3115         struct sk_buff *skb;
3116         u64 handle = 0;
3117         u16 flags = 0;
3118         int err;
3119
3120         if (!ctx->report &&
3121             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3122                 return;
3123
3124         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3125         if (skb == NULL)
3126                 goto err;
3127
3128         if (event == NFT_MSG_NEWRULE &&
3129             !list_is_first(&rule->list, &ctx->chain->rules) &&
3130             !list_is_last(&rule->list, &ctx->chain->rules)) {
3131                 prule = list_prev_entry(rule, list);
3132                 handle = prule->handle;
3133         }
3134         if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3135                 flags |= NLM_F_APPEND;
3136         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3137                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3138
3139         err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3140                                        event, flags, ctx->family, ctx->table,
3141                                        ctx->chain, rule, handle, false);
3142         if (err < 0) {
3143                 kfree_skb(skb);
3144                 goto err;
3145         }
3146
3147         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3148         return;
3149 err:
3150         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3151 }
3152
3153 struct nft_rule_dump_ctx {
3154         char *table;
3155         char *chain;
3156 };
3157
3158 static int __nf_tables_dump_rules(struct sk_buff *skb,
3159                                   unsigned int *idx,
3160                                   struct netlink_callback *cb,
3161                                   const struct nft_table *table,
3162                                   const struct nft_chain *chain,
3163                                   bool reset)
3164 {
3165         struct net *net = sock_net(skb->sk);
3166         const struct nft_rule *rule, *prule;
3167         unsigned int s_idx = cb->args[0];
3168         u64 handle;
3169
3170         prule = NULL;
3171         list_for_each_entry_rcu(rule, &chain->rules, list) {
3172                 if (!nft_is_active(net, rule))
3173                         goto cont_skip;
3174                 if (*idx < s_idx)
3175                         goto cont;
3176                 if (*idx > s_idx) {
3177                         memset(&cb->args[1], 0,
3178                                         sizeof(cb->args) - sizeof(cb->args[0]));
3179                 }
3180                 if (prule)
3181                         handle = prule->handle;
3182                 else
3183                         handle = 0;
3184
3185                 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3186                                         cb->nlh->nlmsg_seq,
3187                                         NFT_MSG_NEWRULE,
3188                                         NLM_F_MULTI | NLM_F_APPEND,
3189                                         table->family,
3190                                         table, chain, rule, handle, reset) < 0)
3191                         return 1;
3192
3193                 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3194 cont:
3195                 prule = rule;
3196 cont_skip:
3197                 (*idx)++;
3198         }
3199         return 0;
3200 }
3201
3202 static int nf_tables_dump_rules(struct sk_buff *skb,
3203                                 struct netlink_callback *cb)
3204 {
3205         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3206         const struct nft_rule_dump_ctx *ctx = cb->data;
3207         struct nft_table *table;
3208         const struct nft_chain *chain;
3209         unsigned int idx = 0;
3210         struct net *net = sock_net(skb->sk);
3211         int family = nfmsg->nfgen_family;
3212         struct nftables_pernet *nft_net;
3213         bool reset = false;
3214
3215         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3216                 reset = true;
3217
3218         rcu_read_lock();
3219         nft_net = nft_pernet(net);
3220         cb->seq = READ_ONCE(nft_net->base_seq);
3221
3222         list_for_each_entry_rcu(table, &nft_net->tables, list) {
3223                 if (family != NFPROTO_UNSPEC && family != table->family)
3224                         continue;
3225
3226                 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3227                         continue;
3228
3229                 if (ctx && ctx->table && ctx->chain) {
3230                         struct rhlist_head *list, *tmp;
3231
3232                         list = rhltable_lookup(&table->chains_ht, ctx->chain,
3233                                                nft_chain_ht_params);
3234                         if (!list)
3235                                 goto done;
3236
3237                         rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3238                                 if (!nft_is_active(net, chain))
3239                                         continue;
3240                                 __nf_tables_dump_rules(skb, &idx,
3241                                                        cb, table, chain, reset);
3242                                 break;
3243                         }
3244                         goto done;
3245                 }
3246
3247                 list_for_each_entry_rcu(chain, &table->chains, list) {
3248                         if (__nf_tables_dump_rules(skb, &idx,
3249                                                    cb, table, chain, reset))
3250                                 goto done;
3251                 }
3252
3253                 if (ctx && ctx->table)
3254                         break;
3255         }
3256 done:
3257         rcu_read_unlock();
3258
3259         cb->args[0] = idx;
3260         return skb->len;
3261 }
3262
3263 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3264 {
3265         const struct nlattr * const *nla = cb->data;
3266         struct nft_rule_dump_ctx *ctx = NULL;
3267
3268         if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3269                 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3270                 if (!ctx)
3271                         return -ENOMEM;
3272
3273                 if (nla[NFTA_RULE_TABLE]) {
3274                         ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3275                                                         GFP_ATOMIC);
3276                         if (!ctx->table) {
3277                                 kfree(ctx);
3278                                 return -ENOMEM;
3279                         }
3280                 }
3281                 if (nla[NFTA_RULE_CHAIN]) {
3282                         ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3283                                                 GFP_ATOMIC);
3284                         if (!ctx->chain) {
3285                                 kfree(ctx->table);
3286                                 kfree(ctx);
3287                                 return -ENOMEM;
3288                         }
3289                 }
3290         }
3291
3292         cb->data = ctx;
3293         return 0;
3294 }
3295
3296 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3297 {
3298         struct nft_rule_dump_ctx *ctx = cb->data;
3299
3300         if (ctx) {
3301                 kfree(ctx->table);
3302                 kfree(ctx->chain);
3303                 kfree(ctx);
3304         }
3305         return 0;
3306 }
3307
3308 /* called with rcu_read_lock held */
3309 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3310                              const struct nlattr * const nla[])
3311 {
3312         struct netlink_ext_ack *extack = info->extack;
3313         u8 genmask = nft_genmask_cur(info->net);
3314         u8 family = info->nfmsg->nfgen_family;
3315         const struct nft_chain *chain;
3316         const struct nft_rule *rule;
3317         struct net *net = info->net;
3318         struct nft_table *table;
3319         struct sk_buff *skb2;
3320         bool reset = false;
3321         int err;
3322
3323         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3324                 struct netlink_dump_control c = {
3325                         .start= nf_tables_dump_rules_start,
3326                         .dump = nf_tables_dump_rules,
3327                         .done = nf_tables_dump_rules_done,
3328                         .module = THIS_MODULE,
3329                         .data = (void *)nla,
3330                 };
3331
3332                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3333         }
3334
3335         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3336         if (IS_ERR(table)) {
3337                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3338                 return PTR_ERR(table);
3339         }
3340
3341         chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3342         if (IS_ERR(chain)) {
3343                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3344                 return PTR_ERR(chain);
3345         }
3346
3347         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3348         if (IS_ERR(rule)) {
3349                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3350                 return PTR_ERR(rule);
3351         }
3352
3353         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3354         if (!skb2)
3355                 return -ENOMEM;
3356
3357         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3358                 reset = true;
3359
3360         err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3361                                        info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3362                                        family, table, chain, rule, 0, reset);
3363         if (err < 0)
3364                 goto err_fill_rule_info;
3365
3366         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3367
3368 err_fill_rule_info:
3369         kfree_skb(skb2);
3370         return err;
3371 }
3372
3373 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3374                                    struct nft_rule *rule)
3375 {
3376         struct nft_expr *expr, *next;
3377
3378         /*
3379          * Careful: some expressions might not be initialized in case this
3380          * is called on error from nf_tables_newrule().
3381          */
3382         expr = nft_expr_first(rule);
3383         while (nft_expr_more(rule, expr)) {
3384                 next = nft_expr_next(expr);
3385                 nf_tables_expr_destroy(ctx, expr);
3386                 expr = next;
3387         }
3388         kfree(rule);
3389 }
3390
3391 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3392 {
3393         nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3394         nf_tables_rule_destroy(ctx, rule);
3395 }
3396
3397 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3398 {
3399         struct nft_expr *expr, *last;
3400         const struct nft_data *data;
3401         struct nft_rule *rule;
3402         int err;
3403
3404         if (ctx->level == NFT_JUMP_STACK_SIZE)
3405                 return -EMLINK;
3406
3407         list_for_each_entry(rule, &chain->rules, list) {
3408                 if (!nft_is_active_next(ctx->net, rule))
3409                         continue;
3410
3411                 nft_rule_for_each_expr(expr, last, rule) {
3412                         if (!expr->ops->validate)
3413                                 continue;
3414
3415                         err = expr->ops->validate(ctx, expr, &data);
3416                         if (err < 0)
3417                                 return err;
3418                 }
3419
3420                 cond_resched();
3421         }
3422
3423         return 0;
3424 }
3425 EXPORT_SYMBOL_GPL(nft_chain_validate);
3426
3427 static int nft_table_validate(struct net *net, const struct nft_table *table)
3428 {
3429         struct nft_chain *chain;
3430         struct nft_ctx ctx = {
3431                 .net    = net,
3432                 .family = table->family,
3433         };
3434         int err;
3435
3436         list_for_each_entry(chain, &table->chains, list) {
3437                 if (!nft_is_base_chain(chain))
3438                         continue;
3439
3440                 ctx.chain = chain;
3441                 err = nft_chain_validate(&ctx, chain);
3442                 if (err < 0)
3443                         return err;
3444         }
3445
3446         return 0;
3447 }
3448
3449 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3450                          const struct nft_set_iter *iter,
3451                          struct nft_set_elem *elem)
3452 {
3453         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3454         struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3455         const struct nft_data *data;
3456         int err;
3457
3458         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3459             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3460                 return 0;
3461
3462         data = nft_set_ext_data(ext);
3463         switch (data->verdict.code) {
3464         case NFT_JUMP:
3465         case NFT_GOTO:
3466                 pctx->level++;
3467                 err = nft_chain_validate(ctx, data->verdict.chain);
3468                 if (err < 0)
3469                         return err;
3470                 pctx->level--;
3471                 break;
3472         default:
3473                 break;
3474         }
3475
3476         return 0;
3477 }
3478
3479 struct nft_set_elem_catchall {
3480         struct list_head        list;
3481         struct rcu_head         rcu;
3482         void                    *elem;
3483 };
3484
3485 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3486 {
3487         u8 genmask = nft_genmask_next(ctx->net);
3488         struct nft_set_elem_catchall *catchall;
3489         struct nft_set_elem elem;
3490         struct nft_set_ext *ext;
3491         int ret = 0;
3492
3493         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3494                 ext = nft_set_elem_ext(set, catchall->elem);
3495                 if (!nft_set_elem_active(ext, genmask))
3496                         continue;
3497
3498                 elem.priv = catchall->elem;
3499                 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3500                 if (ret < 0)
3501                         return ret;
3502         }
3503
3504         return ret;
3505 }
3506
3507 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3508                                              const struct nft_chain *chain,
3509                                              const struct nlattr *nla);
3510
3511 #define NFT_RULE_MAXEXPRS       128
3512
3513 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3514                              const struct nlattr * const nla[])
3515 {
3516         struct nftables_pernet *nft_net = nft_pernet(info->net);
3517         struct netlink_ext_ack *extack = info->extack;
3518         unsigned int size, i, n, ulen = 0, usize = 0;
3519         u8 genmask = nft_genmask_next(info->net);
3520         struct nft_rule *rule, *old_rule = NULL;
3521         struct nft_expr_info *expr_info = NULL;
3522         u8 family = info->nfmsg->nfgen_family;
3523         struct nft_flow_rule *flow = NULL;
3524         struct net *net = info->net;
3525         struct nft_userdata *udata;
3526         struct nft_table *table;
3527         struct nft_chain *chain;
3528         struct nft_trans *trans;
3529         u64 handle, pos_handle;
3530         struct nft_expr *expr;
3531         struct nft_ctx ctx;
3532         struct nlattr *tmp;
3533         int err, rem;
3534
3535         lockdep_assert_held(&nft_net->commit_mutex);
3536
3537         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3538                                  NETLINK_CB(skb).portid);
3539         if (IS_ERR(table)) {
3540                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3541                 return PTR_ERR(table);
3542         }
3543
3544         if (nla[NFTA_RULE_CHAIN]) {
3545                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3546                                          genmask);
3547                 if (IS_ERR(chain)) {
3548                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3549                         return PTR_ERR(chain);
3550                 }
3551                 if (nft_chain_is_bound(chain))
3552                         return -EOPNOTSUPP;
3553
3554         } else if (nla[NFTA_RULE_CHAIN_ID]) {
3555                 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3556                 if (IS_ERR(chain)) {
3557                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3558                         return PTR_ERR(chain);
3559                 }
3560         } else {
3561                 return -EINVAL;
3562         }
3563
3564         if (nla[NFTA_RULE_HANDLE]) {
3565                 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3566                 rule = __nft_rule_lookup(chain, handle);
3567                 if (IS_ERR(rule)) {
3568                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3569                         return PTR_ERR(rule);
3570                 }
3571
3572                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3573                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3574                         return -EEXIST;
3575                 }
3576                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3577                         old_rule = rule;
3578                 else
3579                         return -EOPNOTSUPP;
3580         } else {
3581                 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3582                     info->nlh->nlmsg_flags & NLM_F_REPLACE)
3583                         return -EINVAL;
3584                 handle = nf_tables_alloc_handle(table);
3585
3586                 if (chain->use == UINT_MAX)
3587                         return -EOVERFLOW;
3588
3589                 if (nla[NFTA_RULE_POSITION]) {
3590                         pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3591                         old_rule = __nft_rule_lookup(chain, pos_handle);
3592                         if (IS_ERR(old_rule)) {
3593                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3594                                 return PTR_ERR(old_rule);
3595                         }
3596                 } else if (nla[NFTA_RULE_POSITION_ID]) {
3597                         old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3598                         if (IS_ERR(old_rule)) {
3599                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3600                                 return PTR_ERR(old_rule);
3601                         }
3602                 }
3603         }
3604
3605         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3606
3607         n = 0;
3608         size = 0;
3609         if (nla[NFTA_RULE_EXPRESSIONS]) {
3610                 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3611                                            sizeof(struct nft_expr_info),
3612                                            GFP_KERNEL);
3613                 if (!expr_info)
3614                         return -ENOMEM;
3615
3616                 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3617                         err = -EINVAL;
3618                         if (nla_type(tmp) != NFTA_LIST_ELEM)
3619                                 goto err_release_expr;
3620                         if (n == NFT_RULE_MAXEXPRS)
3621                                 goto err_release_expr;
3622                         err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3623                         if (err < 0) {
3624                                 NL_SET_BAD_ATTR(extack, tmp);
3625                                 goto err_release_expr;
3626                         }
3627                         size += expr_info[n].ops->size;
3628                         n++;
3629                 }
3630         }
3631         /* Check for overflow of dlen field */
3632         err = -EFBIG;
3633         if (size >= 1 << 12)
3634                 goto err_release_expr;
3635
3636         if (nla[NFTA_RULE_USERDATA]) {
3637                 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3638                 if (ulen > 0)
3639                         usize = sizeof(struct nft_userdata) + ulen;
3640         }
3641
3642         err = -ENOMEM;
3643         rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3644         if (rule == NULL)
3645                 goto err_release_expr;
3646
3647         nft_activate_next(net, rule);
3648
3649         rule->handle = handle;
3650         rule->dlen   = size;
3651         rule->udata  = ulen ? 1 : 0;
3652
3653         if (ulen) {
3654                 udata = nft_userdata(rule);
3655                 udata->len = ulen - 1;
3656                 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3657         }
3658
3659         expr = nft_expr_first(rule);
3660         for (i = 0; i < n; i++) {
3661                 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3662                 if (err < 0) {
3663                         NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3664                         goto err_release_rule;
3665                 }
3666
3667                 if (expr_info[i].ops->validate)
3668                         nft_validate_state_update(table, NFT_VALIDATE_NEED);
3669
3670                 expr_info[i].ops = NULL;
3671                 expr = nft_expr_next(expr);
3672         }
3673
3674         if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3675                 flow = nft_flow_rule_create(net, rule);
3676                 if (IS_ERR(flow)) {
3677                         err = PTR_ERR(flow);
3678                         goto err_release_rule;
3679                 }
3680         }
3681
3682         if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3683                 err = nft_delrule(&ctx, old_rule);
3684                 if (err < 0)
3685                         goto err_destroy_flow_rule;
3686
3687                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3688                 if (trans == NULL) {
3689                         err = -ENOMEM;
3690                         goto err_destroy_flow_rule;
3691                 }
3692                 list_add_tail_rcu(&rule->list, &old_rule->list);
3693         } else {
3694                 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3695                 if (!trans) {
3696                         err = -ENOMEM;
3697                         goto err_destroy_flow_rule;
3698                 }
3699
3700                 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3701                         if (old_rule)
3702                                 list_add_rcu(&rule->list, &old_rule->list);
3703                         else
3704                                 list_add_tail_rcu(&rule->list, &chain->rules);
3705                  } else {
3706                         if (old_rule)
3707                                 list_add_tail_rcu(&rule->list, &old_rule->list);
3708                         else
3709                                 list_add_rcu(&rule->list, &chain->rules);
3710                 }
3711         }
3712         kvfree(expr_info);
3713         chain->use++;
3714
3715         if (flow)
3716                 nft_trans_flow_rule(trans) = flow;
3717
3718         if (table->validate_state == NFT_VALIDATE_DO)
3719                 return nft_table_validate(net, table);
3720
3721         return 0;
3722
3723 err_destroy_flow_rule:
3724         if (flow)
3725                 nft_flow_rule_destroy(flow);
3726 err_release_rule:
3727         nf_tables_rule_release(&ctx, rule);
3728 err_release_expr:
3729         for (i = 0; i < n; i++) {
3730                 if (expr_info[i].ops) {
3731                         module_put(expr_info[i].ops->type->owner);
3732                         if (expr_info[i].ops->type->release_ops)
3733                                 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3734                 }
3735         }
3736         kvfree(expr_info);
3737
3738         return err;
3739 }
3740
3741 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3742                                              const struct nft_chain *chain,
3743                                              const struct nlattr *nla)
3744 {
3745         struct nftables_pernet *nft_net = nft_pernet(net);
3746         u32 id = ntohl(nla_get_be32(nla));
3747         struct nft_trans *trans;
3748
3749         list_for_each_entry(trans, &nft_net->commit_list, list) {
3750                 struct nft_rule *rule = nft_trans_rule(trans);
3751
3752                 if (trans->msg_type == NFT_MSG_NEWRULE &&
3753                     trans->ctx.chain == chain &&
3754                     id == nft_trans_rule_id(trans))
3755                         return rule;
3756         }
3757         return ERR_PTR(-ENOENT);
3758 }
3759
3760 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3761                              const struct nlattr * const nla[])
3762 {
3763         struct netlink_ext_ack *extack = info->extack;
3764         u8 genmask = nft_genmask_next(info->net);
3765         u8 family = info->nfmsg->nfgen_family;
3766         struct nft_chain *chain = NULL;
3767         struct net *net = info->net;
3768         struct nft_table *table;
3769         struct nft_rule *rule;
3770         struct nft_ctx ctx;
3771         int err = 0;
3772
3773         table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3774                                  NETLINK_CB(skb).portid);
3775         if (IS_ERR(table)) {
3776                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3777                 return PTR_ERR(table);
3778         }
3779
3780         if (nla[NFTA_RULE_CHAIN]) {
3781                 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3782                                          genmask);
3783                 if (IS_ERR(chain)) {
3784                         if (PTR_ERR(chain) == -ENOENT &&
3785                             NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3786                                 return 0;
3787
3788                         NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3789                         return PTR_ERR(chain);
3790                 }
3791                 if (nft_chain_is_bound(chain))
3792                         return -EOPNOTSUPP;
3793         }
3794
3795         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3796
3797         if (chain) {
3798                 if (nla[NFTA_RULE_HANDLE]) {
3799                         rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3800                         if (IS_ERR(rule)) {
3801                                 if (PTR_ERR(rule) == -ENOENT &&
3802                                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
3803                                         return 0;
3804
3805                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3806                                 return PTR_ERR(rule);
3807                         }
3808
3809                         err = nft_delrule(&ctx, rule);
3810                 } else if (nla[NFTA_RULE_ID]) {
3811                         rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3812                         if (IS_ERR(rule)) {
3813                                 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3814                                 return PTR_ERR(rule);
3815                         }
3816
3817                         err = nft_delrule(&ctx, rule);
3818                 } else {
3819                         err = nft_delrule_by_chain(&ctx);
3820                 }
3821         } else {
3822                 list_for_each_entry(chain, &table->chains, list) {
3823                         if (!nft_is_active_next(net, chain))
3824                                 continue;
3825
3826                         ctx.chain = chain;
3827                         err = nft_delrule_by_chain(&ctx);
3828                         if (err < 0)
3829                                 break;
3830                 }
3831         }
3832
3833         return err;
3834 }
3835
3836 /*
3837  * Sets
3838  */
3839 static const struct nft_set_type *nft_set_types[] = {
3840         &nft_set_hash_fast_type,
3841         &nft_set_hash_type,
3842         &nft_set_rhash_type,
3843         &nft_set_bitmap_type,
3844         &nft_set_rbtree_type,
3845 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3846         &nft_set_pipapo_avx2_type,
3847 #endif
3848         &nft_set_pipapo_type,
3849 };
3850
3851 #define NFT_SET_FEATURES        (NFT_SET_INTERVAL | NFT_SET_MAP | \
3852                                  NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3853                                  NFT_SET_EVAL)
3854
3855 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3856 {
3857         return (flags & type->features) == (flags & NFT_SET_FEATURES);
3858 }
3859
3860 /*
3861  * Select a set implementation based on the data characteristics and the
3862  * given policy. The total memory use might not be known if no size is
3863  * given, in that case the amount of memory per element is used.
3864  */
3865 static const struct nft_set_ops *
3866 nft_select_set_ops(const struct nft_ctx *ctx,
3867                    const struct nlattr * const nla[],
3868                    const struct nft_set_desc *desc)
3869 {
3870         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3871         const struct nft_set_ops *ops, *bops;
3872         struct nft_set_estimate est, best;
3873         const struct nft_set_type *type;
3874         u32 flags = 0;
3875         int i;
3876
3877         lockdep_assert_held(&nft_net->commit_mutex);
3878         lockdep_nfnl_nft_mutex_not_held();
3879
3880         if (nla[NFTA_SET_FLAGS] != NULL)
3881                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3882
3883         bops        = NULL;
3884         best.size   = ~0;
3885         best.lookup = ~0;
3886         best.space  = ~0;
3887
3888         for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3889                 type = nft_set_types[i];
3890                 ops = &type->ops;
3891
3892                 if (!nft_set_ops_candidate(type, flags))
3893                         continue;
3894                 if (!ops->estimate(desc, flags, &est))
3895                         continue;
3896
3897                 switch (desc->policy) {
3898                 case NFT_SET_POL_PERFORMANCE:
3899                         if (est.lookup < best.lookup)
3900                                 break;
3901                         if (est.lookup == best.lookup &&
3902                             est.space < best.space)
3903                                 break;
3904                         continue;
3905                 case NFT_SET_POL_MEMORY:
3906                         if (!desc->size) {
3907                                 if (est.space < best.space)
3908                                         break;
3909                                 if (est.space == best.space &&
3910                                     est.lookup < best.lookup)
3911                                         break;
3912                         } else if (est.size < best.size || !bops) {
3913                                 break;
3914                         }
3915                         continue;
3916                 default:
3917                         break;
3918                 }
3919
3920                 bops = ops;
3921                 best = est;
3922         }
3923
3924         if (bops != NULL)
3925                 return bops;
3926
3927         return ERR_PTR(-EOPNOTSUPP);
3928 }
3929
3930 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3931         [NFTA_SET_TABLE]                = { .type = NLA_STRING,
3932                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
3933         [NFTA_SET_NAME]                 = { .type = NLA_STRING,
3934                                             .len = NFT_SET_MAXNAMELEN - 1 },
3935         [NFTA_SET_FLAGS]                = { .type = NLA_U32 },
3936         [NFTA_SET_KEY_TYPE]             = { .type = NLA_U32 },
3937         [NFTA_SET_KEY_LEN]              = { .type = NLA_U32 },
3938         [NFTA_SET_DATA_TYPE]            = { .type = NLA_U32 },
3939         [NFTA_SET_DATA_LEN]             = { .type = NLA_U32 },
3940         [NFTA_SET_POLICY]               = { .type = NLA_U32 },
3941         [NFTA_SET_DESC]                 = { .type = NLA_NESTED },
3942         [NFTA_SET_ID]                   = { .type = NLA_U32 },
3943         [NFTA_SET_TIMEOUT]              = { .type = NLA_U64 },
3944         [NFTA_SET_GC_INTERVAL]          = { .type = NLA_U32 },
3945         [NFTA_SET_USERDATA]             = { .type = NLA_BINARY,
3946                                             .len  = NFT_USERDATA_MAXLEN },
3947         [NFTA_SET_OBJ_TYPE]             = { .type = NLA_U32 },
3948         [NFTA_SET_HANDLE]               = { .type = NLA_U64 },
3949         [NFTA_SET_EXPR]                 = { .type = NLA_NESTED },
3950         [NFTA_SET_EXPRESSIONS]          = { .type = NLA_NESTED },
3951 };
3952
3953 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3954         [NFTA_SET_DESC_SIZE]            = { .type = NLA_U32 },
3955         [NFTA_SET_DESC_CONCAT]          = { .type = NLA_NESTED },
3956 };
3957
3958 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3959                                       const struct nlattr *nla, u8 genmask)
3960 {
3961         struct nft_set *set;
3962
3963         if (nla == NULL)
3964                 return ERR_PTR(-EINVAL);
3965
3966         list_for_each_entry_rcu(set, &table->sets, list) {
3967                 if (!nla_strcmp(nla, set->name) &&
3968                     nft_active_genmask(set, genmask))
3969                         return set;
3970         }
3971         return ERR_PTR(-ENOENT);
3972 }
3973
3974 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3975                                                const struct nlattr *nla,
3976                                                u8 genmask)
3977 {
3978         struct nft_set *set;
3979
3980         list_for_each_entry(set, &table->sets, list) {
3981                 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3982                     nft_active_genmask(set, genmask))
3983                         return set;
3984         }
3985         return ERR_PTR(-ENOENT);
3986 }
3987
3988 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3989                                            const struct nft_table *table,
3990                                            const struct nlattr *nla, u8 genmask)
3991 {
3992         struct nftables_pernet *nft_net = nft_pernet(net);
3993         u32 id = ntohl(nla_get_be32(nla));
3994         struct nft_trans *trans;
3995
3996         list_for_each_entry(trans, &nft_net->commit_list, list) {
3997                 if (trans->msg_type == NFT_MSG_NEWSET) {
3998                         struct nft_set *set = nft_trans_set(trans);
3999
4000                         if (id == nft_trans_set_id(trans) &&
4001                             set->table == table &&
4002                             nft_active_genmask(set, genmask))
4003                                 return set;
4004                 }
4005         }
4006         return ERR_PTR(-ENOENT);
4007 }
4008
4009 struct nft_set *nft_set_lookup_global(const struct net *net,
4010                                       const struct nft_table *table,
4011                                       const struct nlattr *nla_set_name,
4012                                       const struct nlattr *nla_set_id,
4013                                       u8 genmask)
4014 {
4015         struct nft_set *set;
4016
4017         set = nft_set_lookup(table, nla_set_name, genmask);
4018         if (IS_ERR(set)) {
4019                 if (!nla_set_id)
4020                         return set;
4021
4022                 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4023         }
4024         return set;
4025 }
4026 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4027
4028 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4029                                     const char *name)
4030 {
4031         const struct nft_set *i;
4032         const char *p;
4033         unsigned long *inuse;
4034         unsigned int n = 0, min = 0;
4035
4036         p = strchr(name, '%');
4037         if (p != NULL) {
4038                 if (p[1] != 'd' || strchr(p + 2, '%'))
4039                         return -EINVAL;
4040
4041                 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4042                 if (inuse == NULL)
4043                         return -ENOMEM;
4044 cont:
4045                 list_for_each_entry(i, &ctx->table->sets, list) {
4046                         int tmp;
4047
4048                         if (!nft_is_active_next(ctx->net, i))
4049                                 continue;
4050                         if (!sscanf(i->name, name, &tmp))
4051                                 continue;
4052                         if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4053                                 continue;
4054
4055                         set_bit(tmp - min, inuse);
4056                 }
4057
4058                 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4059                 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4060                         min += BITS_PER_BYTE * PAGE_SIZE;
4061                         memset(inuse, 0, PAGE_SIZE);
4062                         goto cont;
4063                 }
4064                 free_page((unsigned long)inuse);
4065         }
4066
4067         set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4068         if (!set->name)
4069                 return -ENOMEM;
4070
4071         list_for_each_entry(i, &ctx->table->sets, list) {
4072                 if (!nft_is_active_next(ctx->net, i))
4073                         continue;
4074                 if (!strcmp(set->name, i->name)) {
4075                         kfree(set->name);
4076                         set->name = NULL;
4077                         return -ENFILE;
4078                 }
4079         }
4080         return 0;
4081 }
4082
4083 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4084 {
4085         u64 ms = be64_to_cpu(nla_get_be64(nla));
4086         u64 max = (u64)(~((u64)0));
4087
4088         max = div_u64(max, NSEC_PER_MSEC);
4089         if (ms >= max)
4090                 return -ERANGE;
4091
4092         ms *= NSEC_PER_MSEC;
4093         *result = nsecs_to_jiffies64(ms);
4094         return 0;
4095 }
4096
4097 __be64 nf_jiffies64_to_msecs(u64 input)
4098 {
4099         return cpu_to_be64(jiffies64_to_msecs(input));
4100 }
4101
4102 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4103                                      const struct nft_set *set)
4104 {
4105         struct nlattr *concat, *field;
4106         int i;
4107
4108         concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4109         if (!concat)
4110                 return -ENOMEM;
4111
4112         for (i = 0; i < set->field_count; i++) {
4113                 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4114                 if (!field)
4115                         return -ENOMEM;
4116
4117                 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4118                                  htonl(set->field_len[i])))
4119                         return -ENOMEM;
4120
4121                 nla_nest_end(skb, field);
4122         }
4123
4124         nla_nest_end(skb, concat);
4125
4126         return 0;
4127 }
4128
4129 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4130                               const struct nft_set *set, u16 event, u16 flags)
4131 {
4132         u64 timeout = READ_ONCE(set->timeout);
4133         u32 gc_int = READ_ONCE(set->gc_int);
4134         u32 portid = ctx->portid;
4135         struct nlmsghdr *nlh;
4136         struct nlattr *nest;
4137         u32 seq = ctx->seq;
4138         int i;
4139
4140         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4141         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4142                            NFNETLINK_V0, nft_base_seq(ctx->net));
4143         if (!nlh)
4144                 goto nla_put_failure;
4145
4146         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4147                 goto nla_put_failure;
4148         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4149                 goto nla_put_failure;
4150         if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4151                          NFTA_SET_PAD))
4152                 goto nla_put_failure;
4153         if (set->flags != 0)
4154                 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4155                         goto nla_put_failure;
4156
4157         if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4158                 goto nla_put_failure;
4159         if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4160                 goto nla_put_failure;
4161         if (set->flags & NFT_SET_MAP) {
4162                 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4163                         goto nla_put_failure;
4164                 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4165                         goto nla_put_failure;
4166         }
4167         if (set->flags & NFT_SET_OBJECT &&
4168             nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4169                 goto nla_put_failure;
4170
4171         if (timeout &&
4172             nla_put_be64(skb, NFTA_SET_TIMEOUT,
4173                          nf_jiffies64_to_msecs(timeout),
4174                          NFTA_SET_PAD))
4175                 goto nla_put_failure;
4176         if (gc_int &&
4177             nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4178                 goto nla_put_failure;
4179
4180         if (set->policy != NFT_SET_POL_PERFORMANCE) {
4181                 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4182                         goto nla_put_failure;
4183         }
4184
4185         if (set->udata &&
4186             nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4187                 goto nla_put_failure;
4188
4189         nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4190         if (!nest)
4191                 goto nla_put_failure;
4192         if (set->size &&
4193             nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4194                 goto nla_put_failure;
4195
4196         if (set->field_count > 1 &&
4197             nf_tables_fill_set_concat(skb, set))
4198                 goto nla_put_failure;
4199
4200         nla_nest_end(skb, nest);
4201
4202         if (set->num_exprs == 1) {
4203                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4204                 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4205                         goto nla_put_failure;
4206
4207                 nla_nest_end(skb, nest);
4208         } else if (set->num_exprs > 1) {
4209                 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4210                 if (nest == NULL)
4211                         goto nla_put_failure;
4212
4213                 for (i = 0; i < set->num_exprs; i++) {
4214                         if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4215                                           set->exprs[i], false) < 0)
4216                                 goto nla_put_failure;
4217                 }
4218                 nla_nest_end(skb, nest);
4219         }
4220
4221         nlmsg_end(skb, nlh);
4222         return 0;
4223
4224 nla_put_failure:
4225         nlmsg_trim(skb, nlh);
4226         return -1;
4227 }
4228
4229 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4230                                  const struct nft_set *set, int event,
4231                                  gfp_t gfp_flags)
4232 {
4233         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4234         u32 portid = ctx->portid;
4235         struct sk_buff *skb;
4236         u16 flags = 0;
4237         int err;
4238
4239         if (!ctx->report &&
4240             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4241                 return;
4242
4243         skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4244         if (skb == NULL)
4245                 goto err;
4246
4247         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4248                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4249
4250         err = nf_tables_fill_set(skb, ctx, set, event, flags);
4251         if (err < 0) {
4252                 kfree_skb(skb);
4253                 goto err;
4254         }
4255
4256         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4257         return;
4258 err:
4259         nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4260 }
4261
4262 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4263 {
4264         const struct nft_set *set;
4265         unsigned int idx, s_idx = cb->args[0];
4266         struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4267         struct net *net = sock_net(skb->sk);
4268         struct nft_ctx *ctx = cb->data, ctx_set;
4269         struct nftables_pernet *nft_net;
4270
4271         if (cb->args[1])
4272                 return skb->len;
4273
4274         rcu_read_lock();
4275         nft_net = nft_pernet(net);
4276         cb->seq = READ_ONCE(nft_net->base_seq);
4277
4278         list_for_each_entry_rcu(table, &nft_net->tables, list) {
4279                 if (ctx->family != NFPROTO_UNSPEC &&
4280                     ctx->family != table->family)
4281                         continue;
4282
4283                 if (ctx->table && ctx->table != table)
4284                         continue;
4285
4286                 if (cur_table) {
4287                         if (cur_table != table)
4288                                 continue;
4289
4290                         cur_table = NULL;
4291                 }
4292                 idx = 0;
4293                 list_for_each_entry_rcu(set, &table->sets, list) {
4294                         if (idx < s_idx)
4295                                 goto cont;
4296                         if (!nft_is_active(net, set))
4297                                 goto cont;
4298
4299                         ctx_set = *ctx;
4300                         ctx_set.table = table;
4301                         ctx_set.family = table->family;
4302
4303                         if (nf_tables_fill_set(skb, &ctx_set, set,
4304                                                NFT_MSG_NEWSET,
4305                                                NLM_F_MULTI) < 0) {
4306                                 cb->args[0] = idx;
4307                                 cb->args[2] = (unsigned long) table;
4308                                 goto done;
4309                         }
4310                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4311 cont:
4312                         idx++;
4313                 }
4314                 if (s_idx)
4315                         s_idx = 0;
4316         }
4317         cb->args[1] = 1;
4318 done:
4319         rcu_read_unlock();
4320         return skb->len;
4321 }
4322
4323 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4324 {
4325         struct nft_ctx *ctx_dump = NULL;
4326
4327         ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4328         if (ctx_dump == NULL)
4329                 return -ENOMEM;
4330
4331         cb->data = ctx_dump;
4332         return 0;
4333 }
4334
4335 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4336 {
4337         kfree(cb->data);
4338         return 0;
4339 }
4340
4341 /* called with rcu_read_lock held */
4342 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4343                             const struct nlattr * const nla[])
4344 {
4345         struct netlink_ext_ack *extack = info->extack;
4346         u8 genmask = nft_genmask_cur(info->net);
4347         u8 family = info->nfmsg->nfgen_family;
4348         struct nft_table *table = NULL;
4349         struct net *net = info->net;
4350         const struct nft_set *set;
4351         struct sk_buff *skb2;
4352         struct nft_ctx ctx;
4353         int err;
4354
4355         if (nla[NFTA_SET_TABLE]) {
4356                 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4357                                          genmask, 0);
4358                 if (IS_ERR(table)) {
4359                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4360                         return PTR_ERR(table);
4361                 }
4362         }
4363
4364         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4365
4366         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4367                 struct netlink_dump_control c = {
4368                         .start = nf_tables_dump_sets_start,
4369                         .dump = nf_tables_dump_sets,
4370                         .done = nf_tables_dump_sets_done,
4371                         .data = &ctx,
4372                         .module = THIS_MODULE,
4373                 };
4374
4375                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4376         }
4377
4378         /* Only accept unspec with dump */
4379         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4380                 return -EAFNOSUPPORT;
4381         if (!nla[NFTA_SET_TABLE])
4382                 return -EINVAL;
4383
4384         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4385         if (IS_ERR(set))
4386                 return PTR_ERR(set);
4387
4388         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4389         if (skb2 == NULL)
4390                 return -ENOMEM;
4391
4392         err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4393         if (err < 0)
4394                 goto err_fill_set_info;
4395
4396         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4397
4398 err_fill_set_info:
4399         kfree_skb(skb2);
4400         return err;
4401 }
4402
4403 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4404         [NFTA_SET_FIELD_LEN]    = { .type = NLA_U32 },
4405 };
4406
4407 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4408                                      struct nft_set_desc *desc)
4409 {
4410         struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4411         u32 len;
4412         int err;
4413
4414         if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4415                 return -E2BIG;
4416
4417         err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4418                                           nft_concat_policy, NULL);
4419         if (err < 0)
4420                 return err;
4421
4422         if (!tb[NFTA_SET_FIELD_LEN])
4423                 return -EINVAL;
4424
4425         len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4426         if (!len || len > U8_MAX)
4427                 return -EINVAL;
4428
4429         desc->field_len[desc->field_count++] = len;
4430
4431         return 0;
4432 }
4433
4434 static int nft_set_desc_concat(struct nft_set_desc *desc,
4435                                const struct nlattr *nla)
4436 {
4437         struct nlattr *attr;
4438         u32 num_regs = 0;
4439         int rem, err, i;
4440
4441         nla_for_each_nested(attr, nla, rem) {
4442                 if (nla_type(attr) != NFTA_LIST_ELEM)
4443                         return -EINVAL;
4444
4445                 err = nft_set_desc_concat_parse(attr, desc);
4446                 if (err < 0)
4447                         return err;
4448         }
4449
4450         for (i = 0; i < desc->field_count; i++)
4451                 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4452
4453         if (num_regs > NFT_REG32_COUNT)
4454                 return -E2BIG;
4455
4456         return 0;
4457 }
4458
4459 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4460                                     const struct nlattr *nla)
4461 {
4462         struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4463         int err;
4464
4465         err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4466                                           nft_set_desc_policy, NULL);
4467         if (err < 0)
4468                 return err;
4469
4470         if (da[NFTA_SET_DESC_SIZE] != NULL)
4471                 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4472         if (da[NFTA_SET_DESC_CONCAT])
4473                 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4474
4475         return err;
4476 }
4477
4478 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4479                               const struct nlattr * const *nla,
4480                               struct nft_expr **exprs, int *num_exprs,
4481                               u32 flags)
4482 {
4483         struct nft_expr *expr;
4484         int err, i;
4485
4486         if (nla[NFTA_SET_EXPR]) {
4487                 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4488                 if (IS_ERR(expr)) {
4489                         err = PTR_ERR(expr);
4490                         goto err_set_expr_alloc;
4491                 }
4492                 exprs[0] = expr;
4493                 (*num_exprs)++;
4494         } else if (nla[NFTA_SET_EXPRESSIONS]) {
4495                 struct nlattr *tmp;
4496                 int left;
4497
4498                 if (!(flags & NFT_SET_EXPR)) {
4499                         err = -EINVAL;
4500                         goto err_set_expr_alloc;
4501                 }
4502                 i = 0;
4503                 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4504                         if (i == NFT_SET_EXPR_MAX) {
4505                                 err = -E2BIG;
4506                                 goto err_set_expr_alloc;
4507                         }
4508                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
4509                                 err = -EINVAL;
4510                                 goto err_set_expr_alloc;
4511                         }
4512                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4513                         if (IS_ERR(expr)) {
4514                                 err = PTR_ERR(expr);
4515                                 goto err_set_expr_alloc;
4516                         }
4517                         exprs[i++] = expr;
4518                         (*num_exprs)++;
4519                 }
4520         }
4521
4522         return 0;
4523
4524 err_set_expr_alloc:
4525         for (i = 0; i < *num_exprs; i++)
4526                 nft_expr_destroy(ctx, exprs[i]);
4527
4528         return err;
4529 }
4530
4531 static bool nft_set_is_same(const struct nft_set *set,
4532                             const struct nft_set_desc *desc,
4533                             struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4534 {
4535         int i;
4536
4537         if (set->ktype != desc->ktype ||
4538             set->dtype != desc->dtype ||
4539             set->flags != flags ||
4540             set->klen != desc->klen ||
4541             set->dlen != desc->dlen ||
4542             set->field_count != desc->field_count ||
4543             set->num_exprs != num_exprs)
4544                 return false;
4545
4546         for (i = 0; i < desc->field_count; i++) {
4547                 if (set->field_len[i] != desc->field_len[i])
4548                         return false;
4549         }
4550
4551         for (i = 0; i < num_exprs; i++) {
4552                 if (set->exprs[i]->ops != exprs[i]->ops)
4553                         return false;
4554         }
4555
4556         return true;
4557 }
4558
4559 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4560                             const struct nlattr * const nla[])
4561 {
4562         struct netlink_ext_ack *extack = info->extack;
4563         u8 genmask = nft_genmask_next(info->net);
4564         u8 family = info->nfmsg->nfgen_family;
4565         const struct nft_set_ops *ops;
4566         struct net *net = info->net;
4567         struct nft_set_desc desc;
4568         struct nft_table *table;
4569         unsigned char *udata;
4570         struct nft_set *set;
4571         struct nft_ctx ctx;
4572         size_t alloc_size;
4573         int num_exprs = 0;
4574         char *name;
4575         int err, i;
4576         u16 udlen;
4577         u32 flags;
4578         u64 size;
4579
4580         if (nla[NFTA_SET_TABLE] == NULL ||
4581             nla[NFTA_SET_NAME] == NULL ||
4582             nla[NFTA_SET_KEY_LEN] == NULL ||
4583             nla[NFTA_SET_ID] == NULL)
4584                 return -EINVAL;
4585
4586         memset(&desc, 0, sizeof(desc));
4587
4588         desc.ktype = NFT_DATA_VALUE;
4589         if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4590                 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4591                 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4592                         return -EINVAL;
4593         }
4594
4595         desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4596         if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4597                 return -EINVAL;
4598
4599         flags = 0;
4600         if (nla[NFTA_SET_FLAGS] != NULL) {
4601                 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4602                 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4603                               NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4604                               NFT_SET_MAP | NFT_SET_EVAL |
4605                               NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4606                         return -EOPNOTSUPP;
4607                 /* Only one of these operations is supported */
4608                 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4609                              (NFT_SET_MAP | NFT_SET_OBJECT))
4610                         return -EOPNOTSUPP;
4611                 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4612                              (NFT_SET_EVAL | NFT_SET_OBJECT))
4613                         return -EOPNOTSUPP;
4614         }
4615
4616         desc.dtype = 0;
4617         if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4618                 if (!(flags & NFT_SET_MAP))
4619                         return -EINVAL;
4620
4621                 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4622                 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4623                     desc.dtype != NFT_DATA_VERDICT)
4624                         return -EINVAL;
4625
4626                 if (desc.dtype != NFT_DATA_VERDICT) {
4627                         if (nla[NFTA_SET_DATA_LEN] == NULL)
4628                                 return -EINVAL;
4629                         desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4630                         if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4631                                 return -EINVAL;
4632                 } else
4633                         desc.dlen = sizeof(struct nft_verdict);
4634         } else if (flags & NFT_SET_MAP)
4635                 return -EINVAL;
4636
4637         if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4638                 if (!(flags & NFT_SET_OBJECT))
4639                         return -EINVAL;
4640
4641                 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4642                 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4643                     desc.objtype > NFT_OBJECT_MAX)
4644                         return -EOPNOTSUPP;
4645         } else if (flags & NFT_SET_OBJECT)
4646                 return -EINVAL;
4647         else
4648                 desc.objtype = NFT_OBJECT_UNSPEC;
4649
4650         desc.timeout = 0;
4651         if (nla[NFTA_SET_TIMEOUT] != NULL) {
4652                 if (!(flags & NFT_SET_TIMEOUT))
4653                         return -EINVAL;
4654
4655                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4656                 if (err)
4657                         return err;
4658         }
4659         desc.gc_int = 0;
4660         if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4661                 if (!(flags & NFT_SET_TIMEOUT))
4662                         return -EINVAL;
4663                 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4664         }
4665
4666         desc.policy = NFT_SET_POL_PERFORMANCE;
4667         if (nla[NFTA_SET_POLICY] != NULL)
4668                 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4669
4670         if (nla[NFTA_SET_DESC] != NULL) {
4671                 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4672                 if (err < 0)
4673                         return err;
4674
4675                 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4676                         return -EINVAL;
4677         } else if (flags & NFT_SET_CONCAT) {
4678                 return -EINVAL;
4679         }
4680
4681         if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4682                 desc.expr = true;
4683
4684         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4685                                  NETLINK_CB(skb).portid);
4686         if (IS_ERR(table)) {
4687                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4688                 return PTR_ERR(table);
4689         }
4690
4691         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4692
4693         set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4694         if (IS_ERR(set)) {
4695                 if (PTR_ERR(set) != -ENOENT) {
4696                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4697                         return PTR_ERR(set);
4698                 }
4699         } else {
4700                 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4701
4702                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4703                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4704                         return -EEXIST;
4705                 }
4706                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4707                         return -EOPNOTSUPP;
4708
4709                 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4710                 if (err < 0)
4711                         return err;
4712
4713                 err = 0;
4714                 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4715                         NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4716                         err = -EEXIST;
4717                 }
4718
4719                 for (i = 0; i < num_exprs; i++)
4720                         nft_expr_destroy(&ctx, exprs[i]);
4721
4722                 if (err < 0)
4723                         return err;
4724
4725                 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4726         }
4727
4728         if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4729                 return -ENOENT;
4730
4731         ops = nft_select_set_ops(&ctx, nla, &desc);
4732         if (IS_ERR(ops))
4733                 return PTR_ERR(ops);
4734
4735         udlen = 0;
4736         if (nla[NFTA_SET_USERDATA])
4737                 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4738
4739         size = 0;
4740         if (ops->privsize != NULL)
4741                 size = ops->privsize(nla, &desc);
4742         alloc_size = sizeof(*set) + size + udlen;
4743         if (alloc_size < size || alloc_size > INT_MAX)
4744                 return -ENOMEM;
4745         set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4746         if (!set)
4747                 return -ENOMEM;
4748
4749         name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4750         if (!name) {
4751                 err = -ENOMEM;
4752                 goto err_set_name;
4753         }
4754
4755         err = nf_tables_set_alloc_name(&ctx, set, name);
4756         kfree(name);
4757         if (err < 0)
4758                 goto err_set_name;
4759
4760         udata = NULL;
4761         if (udlen) {
4762                 udata = set->data + size;
4763                 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4764         }
4765
4766         INIT_LIST_HEAD(&set->bindings);
4767         INIT_LIST_HEAD(&set->catchall_list);
4768         set->table = table;
4769         write_pnet(&set->net, net);
4770         set->ops = ops;
4771         set->ktype = desc.ktype;
4772         set->klen = desc.klen;
4773         set->dtype = desc.dtype;
4774         set->objtype = desc.objtype;
4775         set->dlen = desc.dlen;
4776         set->flags = flags;
4777         set->size = desc.size;
4778         set->policy = desc.policy;
4779         set->udlen = udlen;
4780         set->udata = udata;
4781         set->timeout = desc.timeout;
4782         set->gc_int = desc.gc_int;
4783
4784         set->field_count = desc.field_count;
4785         for (i = 0; i < desc.field_count; i++)
4786                 set->field_len[i] = desc.field_len[i];
4787
4788         err = ops->init(set, &desc, nla);
4789         if (err < 0)
4790                 goto err_set_init;
4791
4792         err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4793         if (err < 0)
4794                 goto err_set_destroy;
4795
4796         set->num_exprs = num_exprs;
4797         set->handle = nf_tables_alloc_handle(table);
4798
4799         err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4800         if (err < 0)
4801                 goto err_set_expr_alloc;
4802
4803         list_add_tail_rcu(&set->list, &table->sets);
4804         table->use++;
4805         return 0;
4806
4807 err_set_expr_alloc:
4808         for (i = 0; i < set->num_exprs; i++)
4809                 nft_expr_destroy(&ctx, set->exprs[i]);
4810 err_set_destroy:
4811         ops->destroy(set);
4812 err_set_init:
4813         kfree(set->name);
4814 err_set_name:
4815         kvfree(set);
4816         return err;
4817 }
4818
4819 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4820                                      struct nft_set *set)
4821 {
4822         struct nft_set_elem_catchall *next, *catchall;
4823
4824         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4825                 list_del_rcu(&catchall->list);
4826                 nft_set_elem_destroy(set, catchall->elem, true);
4827                 kfree_rcu(catchall, rcu);
4828         }
4829 }
4830
4831 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4832 {
4833         int i;
4834
4835         if (WARN_ON(set->use > 0))
4836                 return;
4837
4838         for (i = 0; i < set->num_exprs; i++)
4839                 nft_expr_destroy(ctx, set->exprs[i]);
4840
4841         set->ops->destroy(set);
4842         nft_set_catchall_destroy(ctx, set);
4843         kfree(set->name);
4844         kvfree(set);
4845 }
4846
4847 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4848                             const struct nlattr * const nla[])
4849 {
4850         struct netlink_ext_ack *extack = info->extack;
4851         u8 genmask = nft_genmask_next(info->net);
4852         u8 family = info->nfmsg->nfgen_family;
4853         struct net *net = info->net;
4854         const struct nlattr *attr;
4855         struct nft_table *table;
4856         struct nft_set *set;
4857         struct nft_ctx ctx;
4858
4859         if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4860                 return -EAFNOSUPPORT;
4861
4862         table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4863                                  genmask, NETLINK_CB(skb).portid);
4864         if (IS_ERR(table)) {
4865                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4866                 return PTR_ERR(table);
4867         }
4868
4869         if (nla[NFTA_SET_HANDLE]) {
4870                 attr = nla[NFTA_SET_HANDLE];
4871                 set = nft_set_lookup_byhandle(table, attr, genmask);
4872         } else {
4873                 attr = nla[NFTA_SET_NAME];
4874                 set = nft_set_lookup(table, attr, genmask);
4875         }
4876
4877         if (IS_ERR(set)) {
4878                 if (PTR_ERR(set) == -ENOENT &&
4879                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
4880                         return 0;
4881
4882                 NL_SET_BAD_ATTR(extack, attr);
4883                 return PTR_ERR(set);
4884         }
4885         if (set->use ||
4886             (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4887              atomic_read(&set->nelems) > 0)) {
4888                 NL_SET_BAD_ATTR(extack, attr);
4889                 return -EBUSY;
4890         }
4891
4892         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4893
4894         return nft_delset(&ctx, set);
4895 }
4896
4897 static int nft_validate_register_store(const struct nft_ctx *ctx,
4898                                        enum nft_registers reg,
4899                                        const struct nft_data *data,
4900                                        enum nft_data_types type,
4901                                        unsigned int len);
4902
4903 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4904                                      struct nft_set *set,
4905                                      struct nft_set_elem *elem)
4906 {
4907         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4908         enum nft_registers dreg;
4909
4910         dreg = nft_type_to_reg(set->dtype);
4911         return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4912                                            set->dtype == NFT_DATA_VERDICT ?
4913                                            NFT_DATA_VERDICT : NFT_DATA_VALUE,
4914                                            set->dlen);
4915 }
4916
4917 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4918                                         struct nft_set *set,
4919                                         const struct nft_set_iter *iter,
4920                                         struct nft_set_elem *elem)
4921 {
4922         return nft_setelem_data_validate(ctx, set, elem);
4923 }
4924
4925 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4926                                        struct nft_set *set)
4927 {
4928         u8 genmask = nft_genmask_next(ctx->net);
4929         struct nft_set_elem_catchall *catchall;
4930         struct nft_set_elem elem;
4931         struct nft_set_ext *ext;
4932         int ret = 0;
4933
4934         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4935                 ext = nft_set_elem_ext(set, catchall->elem);
4936                 if (!nft_set_elem_active(ext, genmask))
4937                         continue;
4938
4939                 elem.priv = catchall->elem;
4940                 ret = nft_setelem_data_validate(ctx, set, &elem);
4941                 if (ret < 0)
4942                         break;
4943         }
4944
4945         return ret;
4946 }
4947
4948 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4949                        struct nft_set_binding *binding)
4950 {
4951         struct nft_set_binding *i;
4952         struct nft_set_iter iter;
4953
4954         if (set->use == UINT_MAX)
4955                 return -EOVERFLOW;
4956
4957         if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4958                 return -EBUSY;
4959
4960         if (binding->flags & NFT_SET_MAP) {
4961                 /* If the set is already bound to the same chain all
4962                  * jumps are already validated for that chain.
4963                  */
4964                 list_for_each_entry(i, &set->bindings, list) {
4965                         if (i->flags & NFT_SET_MAP &&
4966                             i->chain == binding->chain)
4967                                 goto bind;
4968                 }
4969
4970                 iter.genmask    = nft_genmask_next(ctx->net);
4971                 iter.skip       = 0;
4972                 iter.count      = 0;
4973                 iter.err        = 0;
4974                 iter.fn         = nf_tables_bind_check_setelem;
4975
4976                 set->ops->walk(ctx, set, &iter);
4977                 if (!iter.err)
4978                         iter.err = nft_set_catchall_bind_check(ctx, set);
4979
4980                 if (iter.err < 0)
4981                         return iter.err;
4982         }
4983 bind:
4984         binding->chain = ctx->chain;
4985         list_add_tail_rcu(&binding->list, &set->bindings);
4986         nft_set_trans_bind(ctx, set);
4987         set->use++;
4988
4989         return 0;
4990 }
4991 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4992
4993 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4994                                  struct nft_set_binding *binding, bool event)
4995 {
4996         list_del_rcu(&binding->list);
4997
4998         if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4999                 list_del_rcu(&set->list);
5000                 if (event)
5001                         nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5002                                              GFP_KERNEL);
5003         }
5004 }
5005
5006 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5007                               struct nft_set_binding *binding,
5008                               enum nft_trans_phase phase)
5009 {
5010         switch (phase) {
5011         case NFT_TRANS_PREPARE:
5012                 set->use--;
5013                 return;
5014         case NFT_TRANS_ABORT:
5015         case NFT_TRANS_RELEASE:
5016                 set->use--;
5017                 fallthrough;
5018         default:
5019                 nf_tables_unbind_set(ctx, set, binding,
5020                                      phase == NFT_TRANS_COMMIT);
5021         }
5022 }
5023 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5024
5025 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5026 {
5027         if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5028                 nft_set_destroy(ctx, set);
5029 }
5030 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5031
5032 const struct nft_set_ext_type nft_set_ext_types[] = {
5033         [NFT_SET_EXT_KEY]               = {
5034                 .align  = __alignof__(u32),
5035         },
5036         [NFT_SET_EXT_DATA]              = {
5037                 .align  = __alignof__(u32),
5038         },
5039         [NFT_SET_EXT_EXPRESSIONS]       = {
5040                 .align  = __alignof__(struct nft_set_elem_expr),
5041         },
5042         [NFT_SET_EXT_OBJREF]            = {
5043                 .len    = sizeof(struct nft_object *),
5044                 .align  = __alignof__(struct nft_object *),
5045         },
5046         [NFT_SET_EXT_FLAGS]             = {
5047                 .len    = sizeof(u8),
5048                 .align  = __alignof__(u8),
5049         },
5050         [NFT_SET_EXT_TIMEOUT]           = {
5051                 .len    = sizeof(u64),
5052                 .align  = __alignof__(u64),
5053         },
5054         [NFT_SET_EXT_EXPIRATION]        = {
5055                 .len    = sizeof(u64),
5056                 .align  = __alignof__(u64),
5057         },
5058         [NFT_SET_EXT_USERDATA]          = {
5059                 .len    = sizeof(struct nft_userdata),
5060                 .align  = __alignof__(struct nft_userdata),
5061         },
5062         [NFT_SET_EXT_KEY_END]           = {
5063                 .align  = __alignof__(u32),
5064         },
5065 };
5066
5067 /*
5068  * Set elements
5069  */
5070
5071 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5072         [NFTA_SET_ELEM_KEY]             = { .type = NLA_NESTED },
5073         [NFTA_SET_ELEM_DATA]            = { .type = NLA_NESTED },
5074         [NFTA_SET_ELEM_FLAGS]           = { .type = NLA_U32 },
5075         [NFTA_SET_ELEM_TIMEOUT]         = { .type = NLA_U64 },
5076         [NFTA_SET_ELEM_EXPIRATION]      = { .type = NLA_U64 },
5077         [NFTA_SET_ELEM_USERDATA]        = { .type = NLA_BINARY,
5078                                             .len = NFT_USERDATA_MAXLEN },
5079         [NFTA_SET_ELEM_EXPR]            = { .type = NLA_NESTED },
5080         [NFTA_SET_ELEM_OBJREF]          = { .type = NLA_STRING,
5081                                             .len = NFT_OBJ_MAXNAMELEN - 1 },
5082         [NFTA_SET_ELEM_KEY_END]         = { .type = NLA_NESTED },
5083         [NFTA_SET_ELEM_EXPRESSIONS]     = { .type = NLA_NESTED },
5084 };
5085
5086 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5087         [NFTA_SET_ELEM_LIST_TABLE]      = { .type = NLA_STRING,
5088                                             .len = NFT_TABLE_MAXNAMELEN - 1 },
5089         [NFTA_SET_ELEM_LIST_SET]        = { .type = NLA_STRING,
5090                                             .len = NFT_SET_MAXNAMELEN - 1 },
5091         [NFTA_SET_ELEM_LIST_ELEMENTS]   = { .type = NLA_NESTED },
5092         [NFTA_SET_ELEM_LIST_SET_ID]     = { .type = NLA_U32 },
5093 };
5094
5095 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5096                                   const struct nft_set *set,
5097                                   const struct nft_set_ext *ext)
5098 {
5099         struct nft_set_elem_expr *elem_expr;
5100         u32 size, num_exprs = 0;
5101         struct nft_expr *expr;
5102         struct nlattr *nest;
5103
5104         elem_expr = nft_set_ext_expr(ext);
5105         nft_setelem_expr_foreach(expr, elem_expr, size)
5106                 num_exprs++;
5107
5108         if (num_exprs == 1) {
5109                 expr = nft_setelem_expr_at(elem_expr, 0);
5110                 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, false) < 0)
5111                         return -1;
5112
5113                 return 0;
5114         } else if (num_exprs > 1) {
5115                 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5116                 if (nest == NULL)
5117                         goto nla_put_failure;
5118
5119                 nft_setelem_expr_foreach(expr, elem_expr, size) {
5120                         expr = nft_setelem_expr_at(elem_expr, size);
5121                         if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, false) < 0)
5122                                 goto nla_put_failure;
5123                 }
5124                 nla_nest_end(skb, nest);
5125         }
5126         return 0;
5127
5128 nla_put_failure:
5129         return -1;
5130 }
5131
5132 static int nf_tables_fill_setelem(struct sk_buff *skb,
5133                                   const struct nft_set *set,
5134                                   const struct nft_set_elem *elem)
5135 {
5136         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5137         unsigned char *b = skb_tail_pointer(skb);
5138         struct nlattr *nest;
5139
5140         nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5141         if (nest == NULL)
5142                 goto nla_put_failure;
5143
5144         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5145             nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5146                           NFT_DATA_VALUE, set->klen) < 0)
5147                 goto nla_put_failure;
5148
5149         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5150             nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5151                           NFT_DATA_VALUE, set->klen) < 0)
5152                 goto nla_put_failure;
5153
5154         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5155             nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5156                           set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5157                           set->dlen) < 0)
5158                 goto nla_put_failure;
5159
5160         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5161             nft_set_elem_expr_dump(skb, set, ext))
5162                 goto nla_put_failure;
5163
5164         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5165             nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5166                            (*nft_set_ext_obj(ext))->key.name) < 0)
5167                 goto nla_put_failure;
5168
5169         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5170             nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5171                          htonl(*nft_set_ext_flags(ext))))
5172                 goto nla_put_failure;
5173
5174         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5175             nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5176                          nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5177                          NFTA_SET_ELEM_PAD))
5178                 goto nla_put_failure;
5179
5180         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5181                 u64 expires, now = get_jiffies_64();
5182
5183                 expires = *nft_set_ext_expiration(ext);
5184                 if (time_before64(now, expires))
5185                         expires -= now;
5186                 else
5187                         expires = 0;
5188
5189                 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5190                                  nf_jiffies64_to_msecs(expires),
5191                                  NFTA_SET_ELEM_PAD))
5192                         goto nla_put_failure;
5193         }
5194
5195         if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5196                 struct nft_userdata *udata;
5197
5198                 udata = nft_set_ext_userdata(ext);
5199                 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5200                             udata->len + 1, udata->data))
5201                         goto nla_put_failure;
5202         }
5203
5204         nla_nest_end(skb, nest);
5205         return 0;
5206
5207 nla_put_failure:
5208         nlmsg_trim(skb, b);
5209         return -EMSGSIZE;
5210 }
5211
5212 struct nft_set_dump_args {
5213         const struct netlink_callback   *cb;
5214         struct nft_set_iter             iter;
5215         struct sk_buff                  *skb;
5216 };
5217
5218 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5219                                   struct nft_set *set,
5220                                   const struct nft_set_iter *iter,
5221                                   struct nft_set_elem *elem)
5222 {
5223         struct nft_set_dump_args *args;
5224
5225         args = container_of(iter, struct nft_set_dump_args, iter);
5226         return nf_tables_fill_setelem(args->skb, set, elem);
5227 }
5228
5229 struct nft_set_dump_ctx {
5230         const struct nft_set    *set;
5231         struct nft_ctx          ctx;
5232 };
5233
5234 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5235                                  const struct nft_set *set)
5236 {
5237         struct nft_set_elem_catchall *catchall;
5238         u8 genmask = nft_genmask_cur(net);
5239         struct nft_set_elem elem;
5240         struct nft_set_ext *ext;
5241         int ret = 0;
5242
5243         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5244                 ext = nft_set_elem_ext(set, catchall->elem);
5245                 if (!nft_set_elem_active(ext, genmask) ||
5246                     nft_set_elem_expired(ext))
5247                         continue;
5248
5249                 elem.priv = catchall->elem;
5250                 ret = nf_tables_fill_setelem(skb, set, &elem);
5251                 break;
5252         }
5253
5254         return ret;
5255 }
5256
5257 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5258 {
5259         struct nft_set_dump_ctx *dump_ctx = cb->data;
5260         struct net *net = sock_net(skb->sk);
5261         struct nftables_pernet *nft_net;
5262         struct nft_table *table;
5263         struct nft_set *set;
5264         struct nft_set_dump_args args;
5265         bool set_found = false;
5266         struct nlmsghdr *nlh;
5267         struct nlattr *nest;
5268         u32 portid, seq;
5269         int event;
5270
5271         rcu_read_lock();
5272         nft_net = nft_pernet(net);
5273         cb->seq = READ_ONCE(nft_net->base_seq);
5274
5275         list_for_each_entry_rcu(table, &nft_net->tables, list) {
5276                 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5277                     dump_ctx->ctx.family != table->family)
5278                         continue;
5279
5280                 if (table != dump_ctx->ctx.table)
5281                         continue;
5282
5283                 list_for_each_entry_rcu(set, &table->sets, list) {
5284                         if (set == dump_ctx->set) {
5285                                 set_found = true;
5286                                 break;
5287                         }
5288                 }
5289                 break;
5290         }
5291
5292         if (!set_found) {
5293                 rcu_read_unlock();
5294                 return -ENOENT;
5295         }
5296
5297         event  = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5298         portid = NETLINK_CB(cb->skb).portid;
5299         seq    = cb->nlh->nlmsg_seq;
5300
5301         nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5302                            table->family, NFNETLINK_V0, nft_base_seq(net));
5303         if (!nlh)
5304                 goto nla_put_failure;
5305
5306         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5307                 goto nla_put_failure;
5308         if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5309                 goto nla_put_failure;
5310
5311         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5312         if (nest == NULL)
5313                 goto nla_put_failure;
5314
5315         args.cb                 = cb;
5316         args.skb                = skb;
5317         args.iter.genmask       = nft_genmask_cur(net);
5318         args.iter.skip          = cb->args[0];
5319         args.iter.count         = 0;
5320         args.iter.err           = 0;
5321         args.iter.fn            = nf_tables_dump_setelem;
5322         set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5323
5324         if (!args.iter.err && args.iter.count == cb->args[0])
5325                 args.iter.err = nft_set_catchall_dump(net, skb, set);
5326         rcu_read_unlock();
5327
5328         nla_nest_end(skb, nest);
5329         nlmsg_end(skb, nlh);
5330
5331         if (args.iter.err && args.iter.err != -EMSGSIZE)
5332                 return args.iter.err;
5333         if (args.iter.count == cb->args[0])
5334                 return 0;
5335
5336         cb->args[0] = args.iter.count;
5337         return skb->len;
5338
5339 nla_put_failure:
5340         rcu_read_unlock();
5341         return -ENOSPC;
5342 }
5343
5344 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5345 {
5346         struct nft_set_dump_ctx *dump_ctx = cb->data;
5347
5348         cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5349
5350         return cb->data ? 0 : -ENOMEM;
5351 }
5352
5353 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5354 {
5355         kfree(cb->data);
5356         return 0;
5357 }
5358
5359 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5360                                        const struct nft_ctx *ctx, u32 seq,
5361                                        u32 portid, int event, u16 flags,
5362                                        const struct nft_set *set,
5363                                        const struct nft_set_elem *elem)
5364 {
5365         struct nlmsghdr *nlh;
5366         struct nlattr *nest;
5367         int err;
5368
5369         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5370         nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5371                            NFNETLINK_V0, nft_base_seq(ctx->net));
5372         if (!nlh)
5373                 goto nla_put_failure;
5374
5375         if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5376                 goto nla_put_failure;
5377         if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5378                 goto nla_put_failure;
5379
5380         nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5381         if (nest == NULL)
5382                 goto nla_put_failure;
5383
5384         err = nf_tables_fill_setelem(skb, set, elem);
5385         if (err < 0)
5386                 goto nla_put_failure;
5387
5388         nla_nest_end(skb, nest);
5389
5390         nlmsg_end(skb, nlh);
5391         return 0;
5392
5393 nla_put_failure:
5394         nlmsg_trim(skb, nlh);
5395         return -1;
5396 }
5397
5398 static int nft_setelem_parse_flags(const struct nft_set *set,
5399                                    const struct nlattr *attr, u32 *flags)
5400 {
5401         if (attr == NULL)
5402                 return 0;
5403
5404         *flags = ntohl(nla_get_be32(attr));
5405         if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5406                 return -EOPNOTSUPP;
5407         if (!(set->flags & NFT_SET_INTERVAL) &&
5408             *flags & NFT_SET_ELEM_INTERVAL_END)
5409                 return -EINVAL;
5410         if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5411             (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5412                 return -EINVAL;
5413
5414         return 0;
5415 }
5416
5417 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5418                                  struct nft_data *key, struct nlattr *attr)
5419 {
5420         struct nft_data_desc desc = {
5421                 .type   = NFT_DATA_VALUE,
5422                 .size   = NFT_DATA_VALUE_MAXLEN,
5423                 .len    = set->klen,
5424         };
5425
5426         return nft_data_init(ctx, key, &desc, attr);
5427 }
5428
5429 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5430                                   struct nft_data_desc *desc,
5431                                   struct nft_data *data,
5432                                   struct nlattr *attr)
5433 {
5434         u32 dtype;
5435
5436         if (set->dtype == NFT_DATA_VERDICT)
5437                 dtype = NFT_DATA_VERDICT;
5438         else
5439                 dtype = NFT_DATA_VALUE;
5440
5441         desc->type = dtype;
5442         desc->size = NFT_DATA_VALUE_MAXLEN;
5443         desc->len = set->dlen;
5444         desc->flags = NFT_DATA_DESC_SETELEM;
5445
5446         return nft_data_init(ctx, data, desc, attr);
5447 }
5448
5449 static void *nft_setelem_catchall_get(const struct net *net,
5450                                       const struct nft_set *set)
5451 {
5452         struct nft_set_elem_catchall *catchall;
5453         u8 genmask = nft_genmask_cur(net);
5454         struct nft_set_ext *ext;
5455         void *priv = NULL;
5456
5457         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5458                 ext = nft_set_elem_ext(set, catchall->elem);
5459                 if (!nft_set_elem_active(ext, genmask) ||
5460                     nft_set_elem_expired(ext))
5461                         continue;
5462
5463                 priv = catchall->elem;
5464                 break;
5465         }
5466
5467         return priv;
5468 }
5469
5470 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5471                            struct nft_set_elem *elem, u32 flags)
5472 {
5473         void *priv;
5474
5475         if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5476                 priv = set->ops->get(ctx->net, set, elem, flags);
5477                 if (IS_ERR(priv))
5478                         return PTR_ERR(priv);
5479         } else {
5480                 priv = nft_setelem_catchall_get(ctx->net, set);
5481                 if (!priv)
5482                         return -ENOENT;
5483         }
5484         elem->priv = priv;
5485
5486         return 0;
5487 }
5488
5489 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5490                             const struct nlattr *attr)
5491 {
5492         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5493         struct nft_set_elem elem;
5494         struct sk_buff *skb;
5495         uint32_t flags = 0;
5496         int err;
5497
5498         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5499                                           nft_set_elem_policy, NULL);
5500         if (err < 0)
5501                 return err;
5502
5503         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5504         if (err < 0)
5505                 return err;
5506
5507         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5508                 return -EINVAL;
5509
5510         if (nla[NFTA_SET_ELEM_KEY]) {
5511                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5512                                             nla[NFTA_SET_ELEM_KEY]);
5513                 if (err < 0)
5514                         return err;
5515         }
5516
5517         if (nla[NFTA_SET_ELEM_KEY_END]) {
5518                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5519                                             nla[NFTA_SET_ELEM_KEY_END]);
5520                 if (err < 0)
5521                         return err;
5522         }
5523
5524         err = nft_setelem_get(ctx, set, &elem, flags);
5525         if (err < 0)
5526                 return err;
5527
5528         err = -ENOMEM;
5529         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5530         if (skb == NULL)
5531                 return err;
5532
5533         err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5534                                           NFT_MSG_NEWSETELEM, 0, set, &elem);
5535         if (err < 0)
5536                 goto err_fill_setelem;
5537
5538         return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5539
5540 err_fill_setelem:
5541         kfree_skb(skb);
5542         return err;
5543 }
5544
5545 /* called with rcu_read_lock held */
5546 static int nf_tables_getsetelem(struct sk_buff *skb,
5547                                 const struct nfnl_info *info,
5548                                 const struct nlattr * const nla[])
5549 {
5550         struct netlink_ext_ack *extack = info->extack;
5551         u8 genmask = nft_genmask_cur(info->net);
5552         u8 family = info->nfmsg->nfgen_family;
5553         struct net *net = info->net;
5554         struct nft_table *table;
5555         struct nft_set *set;
5556         struct nlattr *attr;
5557         struct nft_ctx ctx;
5558         int rem, err = 0;
5559
5560         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5561                                  genmask, 0);
5562         if (IS_ERR(table)) {
5563                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5564                 return PTR_ERR(table);
5565         }
5566
5567         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5568         if (IS_ERR(set))
5569                 return PTR_ERR(set);
5570
5571         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5572
5573         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5574                 struct netlink_dump_control c = {
5575                         .start = nf_tables_dump_set_start,
5576                         .dump = nf_tables_dump_set,
5577                         .done = nf_tables_dump_set_done,
5578                         .module = THIS_MODULE,
5579                 };
5580                 struct nft_set_dump_ctx dump_ctx = {
5581                         .set = set,
5582                         .ctx = ctx,
5583                 };
5584
5585                 c.data = &dump_ctx;
5586                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5587         }
5588
5589         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5590                 return -EINVAL;
5591
5592         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5593                 err = nft_get_set_elem(&ctx, set, attr);
5594                 if (err < 0) {
5595                         NL_SET_BAD_ATTR(extack, attr);
5596                         break;
5597                 }
5598         }
5599
5600         return err;
5601 }
5602
5603 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5604                                      const struct nft_set *set,
5605                                      const struct nft_set_elem *elem,
5606                                      int event)
5607 {
5608         struct nftables_pernet *nft_net;
5609         struct net *net = ctx->net;
5610         u32 portid = ctx->portid;
5611         struct sk_buff *skb;
5612         u16 flags = 0;
5613         int err;
5614
5615         if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5616                 return;
5617
5618         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5619         if (skb == NULL)
5620                 goto err;
5621
5622         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5623                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5624
5625         err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5626                                           set, elem);
5627         if (err < 0) {
5628                 kfree_skb(skb);
5629                 goto err;
5630         }
5631
5632         nft_net = nft_pernet(net);
5633         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5634         return;
5635 err:
5636         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5637 }
5638
5639 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5640                                               int msg_type,
5641                                               struct nft_set *set)
5642 {
5643         struct nft_trans *trans;
5644
5645         trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5646         if (trans == NULL)
5647                 return NULL;
5648
5649         nft_trans_elem_set(trans) = set;
5650         return trans;
5651 }
5652
5653 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5654                                          const struct nft_set *set,
5655                                          const struct nlattr *attr)
5656 {
5657         struct nft_expr *expr;
5658         int err;
5659
5660         expr = nft_expr_init(ctx, attr);
5661         if (IS_ERR(expr))
5662                 return expr;
5663
5664         err = -EOPNOTSUPP;
5665         if (expr->ops->type->flags & NFT_EXPR_GC) {
5666                 if (set->flags & NFT_SET_TIMEOUT)
5667                         goto err_set_elem_expr;
5668                 if (!set->ops->gc_init)
5669                         goto err_set_elem_expr;
5670                 set->ops->gc_init(set);
5671         }
5672
5673         return expr;
5674
5675 err_set_elem_expr:
5676         nft_expr_destroy(ctx, expr);
5677         return ERR_PTR(err);
5678 }
5679
5680 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5681 {
5682         len += nft_set_ext_types[id].len;
5683         if (len > tmpl->ext_len[id] ||
5684             len > U8_MAX)
5685                 return -1;
5686
5687         return 0;
5688 }
5689
5690 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5691                               void *to, const void *from, u32 len)
5692 {
5693         if (nft_set_ext_check(tmpl, id, len) < 0)
5694                 return -1;
5695
5696         memcpy(to, from, len);
5697
5698         return 0;
5699 }
5700
5701 void *nft_set_elem_init(const struct nft_set *set,
5702                         const struct nft_set_ext_tmpl *tmpl,
5703                         const u32 *key, const u32 *key_end,
5704                         const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5705 {
5706         struct nft_set_ext *ext;
5707         void *elem;
5708
5709         elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5710         if (elem == NULL)
5711                 return ERR_PTR(-ENOMEM);
5712
5713         ext = nft_set_elem_ext(set, elem);
5714         nft_set_ext_init(ext, tmpl);
5715
5716         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5717             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5718                                nft_set_ext_key(ext), key, set->klen) < 0)
5719                 goto err_ext_check;
5720
5721         if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5722             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5723                                nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5724                 goto err_ext_check;
5725
5726         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5727             nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5728                                nft_set_ext_data(ext), data, set->dlen) < 0)
5729                 goto err_ext_check;
5730
5731         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5732                 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5733                 if (expiration == 0)
5734                         *nft_set_ext_expiration(ext) += timeout;
5735         }
5736         if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5737                 *nft_set_ext_timeout(ext) = timeout;
5738
5739         return elem;
5740
5741 err_ext_check:
5742         kfree(elem);
5743
5744         return ERR_PTR(-EINVAL);
5745 }
5746
5747 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5748                                         struct nft_expr *expr)
5749 {
5750         if (expr->ops->destroy_clone) {
5751                 expr->ops->destroy_clone(ctx, expr);
5752                 module_put(expr->ops->type->owner);
5753         } else {
5754                 nf_tables_expr_destroy(ctx, expr);
5755         }
5756 }
5757
5758 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5759                                       struct nft_set_elem_expr *elem_expr)
5760 {
5761         struct nft_expr *expr;
5762         u32 size;
5763
5764         nft_setelem_expr_foreach(expr, elem_expr, size)
5765                 __nft_set_elem_expr_destroy(ctx, expr);
5766 }
5767
5768 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5769                           bool destroy_expr)
5770 {
5771         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5772         struct nft_ctx ctx = {
5773                 .net    = read_pnet(&set->net),
5774                 .family = set->table->family,
5775         };
5776
5777         nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5778         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5779                 nft_data_release(nft_set_ext_data(ext), set->dtype);
5780         if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5781                 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5782
5783         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5784                 (*nft_set_ext_obj(ext))->use--;
5785         kfree(elem);
5786 }
5787 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5788
5789 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5790  * with the refcounting from the preparation phase.
5791  */
5792 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5793                                        const struct nft_set *set, void *elem)
5794 {
5795         struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5796
5797         if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5798                 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5799
5800         kfree(elem);
5801 }
5802
5803 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5804                             struct nft_expr *expr_array[])
5805 {
5806         struct nft_expr *expr;
5807         int err, i, k;
5808
5809         for (i = 0; i < set->num_exprs; i++) {
5810                 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5811                 if (!expr)
5812                         goto err_expr;
5813
5814                 err = nft_expr_clone(expr, set->exprs[i]);
5815                 if (err < 0) {
5816                         kfree(expr);
5817                         goto err_expr;
5818                 }
5819                 expr_array[i] = expr;
5820         }
5821
5822         return 0;
5823
5824 err_expr:
5825         for (k = i - 1; k >= 0; k--)
5826                 nft_expr_destroy(ctx, expr_array[k]);
5827
5828         return -ENOMEM;
5829 }
5830
5831 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5832                                    const struct nft_set_ext_tmpl *tmpl,
5833                                    const struct nft_set_ext *ext,
5834                                    struct nft_expr *expr_array[],
5835                                    u32 num_exprs)
5836 {
5837         struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5838         u32 len = sizeof(struct nft_set_elem_expr);
5839         struct nft_expr *expr;
5840         int i, err;
5841
5842         if (num_exprs == 0)
5843                 return 0;
5844
5845         for (i = 0; i < num_exprs; i++)
5846                 len += expr_array[i]->ops->size;
5847
5848         if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5849                 return -EINVAL;
5850
5851         for (i = 0; i < num_exprs; i++) {
5852                 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5853                 err = nft_expr_clone(expr, expr_array[i]);
5854                 if (err < 0)
5855                         goto err_elem_expr_setup;
5856
5857                 elem_expr->size += expr_array[i]->ops->size;
5858                 nft_expr_destroy(ctx, expr_array[i]);
5859                 expr_array[i] = NULL;
5860         }
5861
5862         return 0;
5863
5864 err_elem_expr_setup:
5865         for (; i < num_exprs; i++) {
5866                 nft_expr_destroy(ctx, expr_array[i]);
5867                 expr_array[i] = NULL;
5868         }
5869
5870         return -ENOMEM;
5871 }
5872
5873 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5874                                             const struct nft_set *set)
5875 {
5876         struct nft_set_elem_catchall *catchall;
5877         u8 genmask = nft_genmask_cur(net);
5878         struct nft_set_ext *ext;
5879
5880         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5881                 ext = nft_set_elem_ext(set, catchall->elem);
5882                 if (nft_set_elem_active(ext, genmask) &&
5883                     !nft_set_elem_expired(ext))
5884                         return ext;
5885         }
5886
5887         return NULL;
5888 }
5889 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5890
5891 void *nft_set_catchall_gc(const struct nft_set *set)
5892 {
5893         struct nft_set_elem_catchall *catchall, *next;
5894         struct nft_set_ext *ext;
5895         void *elem = NULL;
5896
5897         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5898                 ext = nft_set_elem_ext(set, catchall->elem);
5899
5900                 if (!nft_set_elem_expired(ext) ||
5901                     nft_set_elem_mark_busy(ext))
5902                         continue;
5903
5904                 elem = catchall->elem;
5905                 list_del_rcu(&catchall->list);
5906                 kfree_rcu(catchall, rcu);
5907                 break;
5908         }
5909
5910         return elem;
5911 }
5912 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5913
5914 static int nft_setelem_catchall_insert(const struct net *net,
5915                                        struct nft_set *set,
5916                                        const struct nft_set_elem *elem,
5917                                        struct nft_set_ext **pext)
5918 {
5919         struct nft_set_elem_catchall *catchall;
5920         u8 genmask = nft_genmask_next(net);
5921         struct nft_set_ext *ext;
5922
5923         list_for_each_entry(catchall, &set->catchall_list, list) {
5924                 ext = nft_set_elem_ext(set, catchall->elem);
5925                 if (nft_set_elem_active(ext, genmask)) {
5926                         *pext = ext;
5927                         return -EEXIST;
5928                 }
5929         }
5930
5931         catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5932         if (!catchall)
5933                 return -ENOMEM;
5934
5935         catchall->elem = elem->priv;
5936         list_add_tail_rcu(&catchall->list, &set->catchall_list);
5937
5938         return 0;
5939 }
5940
5941 static int nft_setelem_insert(const struct net *net,
5942                               struct nft_set *set,
5943                               const struct nft_set_elem *elem,
5944                               struct nft_set_ext **ext, unsigned int flags)
5945 {
5946         int ret;
5947
5948         if (flags & NFT_SET_ELEM_CATCHALL)
5949                 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5950         else
5951                 ret = set->ops->insert(net, set, elem, ext);
5952
5953         return ret;
5954 }
5955
5956 static bool nft_setelem_is_catchall(const struct nft_set *set,
5957                                     const struct nft_set_elem *elem)
5958 {
5959         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5960
5961         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5962             *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5963                 return true;
5964
5965         return false;
5966 }
5967
5968 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5969                                  struct nft_set_elem *elem)
5970 {
5971         struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5972
5973         if (nft_setelem_is_catchall(set, elem)) {
5974                 nft_set_elem_change_active(net, set, ext);
5975                 nft_set_elem_clear_busy(ext);
5976         } else {
5977                 set->ops->activate(net, set, elem);
5978         }
5979 }
5980
5981 static int nft_setelem_catchall_deactivate(const struct net *net,
5982                                            struct nft_set *set,
5983                                            struct nft_set_elem *elem)
5984 {
5985         struct nft_set_elem_catchall *catchall;
5986         struct nft_set_ext *ext;
5987
5988         list_for_each_entry(catchall, &set->catchall_list, list) {
5989                 ext = nft_set_elem_ext(set, catchall->elem);
5990                 if (!nft_is_active(net, ext) ||
5991                     nft_set_elem_mark_busy(ext))
5992                         continue;
5993
5994                 kfree(elem->priv);
5995                 elem->priv = catchall->elem;
5996                 nft_set_elem_change_active(net, set, ext);
5997                 return 0;
5998         }
5999
6000         return -ENOENT;
6001 }
6002
6003 static int __nft_setelem_deactivate(const struct net *net,
6004                                     struct nft_set *set,
6005                                     struct nft_set_elem *elem)
6006 {
6007         void *priv;
6008
6009         priv = set->ops->deactivate(net, set, elem);
6010         if (!priv)
6011                 return -ENOENT;
6012
6013         kfree(elem->priv);
6014         elem->priv = priv;
6015         set->ndeact++;
6016
6017         return 0;
6018 }
6019
6020 static int nft_setelem_deactivate(const struct net *net,
6021                                   struct nft_set *set,
6022                                   struct nft_set_elem *elem, u32 flags)
6023 {
6024         int ret;
6025
6026         if (flags & NFT_SET_ELEM_CATCHALL)
6027                 ret = nft_setelem_catchall_deactivate(net, set, elem);
6028         else
6029                 ret = __nft_setelem_deactivate(net, set, elem);
6030
6031         return ret;
6032 }
6033
6034 static void nft_setelem_catchall_remove(const struct net *net,
6035                                         const struct nft_set *set,
6036                                         const struct nft_set_elem *elem)
6037 {
6038         struct nft_set_elem_catchall *catchall, *next;
6039
6040         list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6041                 if (catchall->elem == elem->priv) {
6042                         list_del_rcu(&catchall->list);
6043                         kfree_rcu(catchall, rcu);
6044                         break;
6045                 }
6046         }
6047 }
6048
6049 static void nft_setelem_remove(const struct net *net,
6050                                const struct nft_set *set,
6051                                const struct nft_set_elem *elem)
6052 {
6053         if (nft_setelem_is_catchall(set, elem))
6054                 nft_setelem_catchall_remove(net, set, elem);
6055         else
6056                 set->ops->remove(net, set, elem);
6057 }
6058
6059 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6060                                       struct nlattr **nla, u32 flags)
6061 {
6062         if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6063                           (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6064                 if (flags & NFT_SET_ELEM_INTERVAL_END)
6065                         return false;
6066
6067                 if (nla[NFTA_SET_ELEM_KEY_END] &&
6068                     flags & NFT_SET_ELEM_CATCHALL)
6069                         return false;
6070         } else {
6071                 if (nla[NFTA_SET_ELEM_KEY_END])
6072                         return false;
6073         }
6074
6075         return true;
6076 }
6077
6078 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6079                             const struct nlattr *attr, u32 nlmsg_flags)
6080 {
6081         struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6082         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6083         u8 genmask = nft_genmask_next(ctx->net);
6084         u32 flags = 0, size = 0, num_exprs = 0;
6085         struct nft_set_ext_tmpl tmpl;
6086         struct nft_set_ext *ext, *ext2;
6087         struct nft_set_elem elem;
6088         struct nft_set_binding *binding;
6089         struct nft_object *obj = NULL;
6090         struct nft_userdata *udata;
6091         struct nft_data_desc desc;
6092         enum nft_registers dreg;
6093         struct nft_trans *trans;
6094         u64 timeout;
6095         u64 expiration;
6096         int err, i;
6097         u8 ulen;
6098
6099         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6100                                           nft_set_elem_policy, NULL);
6101         if (err < 0)
6102                 return err;
6103
6104         nft_set_ext_prepare(&tmpl);
6105
6106         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6107         if (err < 0)
6108                 return err;
6109
6110         if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6111             (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6112                 return -EINVAL;
6113
6114         if (flags != 0) {
6115                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6116                 if (err < 0)
6117                         return err;
6118         }
6119
6120         if (set->flags & NFT_SET_MAP) {
6121                 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6122                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6123                         return -EINVAL;
6124         } else {
6125                 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6126                         return -EINVAL;
6127         }
6128
6129         if (set->flags & NFT_SET_OBJECT) {
6130                 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6131                     !(flags & NFT_SET_ELEM_INTERVAL_END))
6132                         return -EINVAL;
6133         } else {
6134                 if (nla[NFTA_SET_ELEM_OBJREF])
6135                         return -EINVAL;
6136         }
6137
6138         if (!nft_setelem_valid_key_end(set, nla, flags))
6139                 return -EINVAL;
6140
6141         if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6142              (nla[NFTA_SET_ELEM_DATA] ||
6143               nla[NFTA_SET_ELEM_OBJREF] ||
6144               nla[NFTA_SET_ELEM_TIMEOUT] ||
6145               nla[NFTA_SET_ELEM_EXPIRATION] ||
6146               nla[NFTA_SET_ELEM_USERDATA] ||
6147               nla[NFTA_SET_ELEM_EXPR] ||
6148               nla[NFTA_SET_ELEM_KEY_END] ||
6149               nla[NFTA_SET_ELEM_EXPRESSIONS]))
6150                 return -EINVAL;
6151
6152         timeout = 0;
6153         if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6154                 if (!(set->flags & NFT_SET_TIMEOUT))
6155                         return -EINVAL;
6156                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6157                                             &timeout);
6158                 if (err)
6159                         return err;
6160         } else if (set->flags & NFT_SET_TIMEOUT &&
6161                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6162                 timeout = READ_ONCE(set->timeout);
6163         }
6164
6165         expiration = 0;
6166         if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6167                 if (!(set->flags & NFT_SET_TIMEOUT))
6168                         return -EINVAL;
6169                 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6170                                             &expiration);
6171                 if (err)
6172                         return err;
6173         }
6174
6175         if (nla[NFTA_SET_ELEM_EXPR]) {
6176                 struct nft_expr *expr;
6177
6178                 if (set->num_exprs && set->num_exprs != 1)
6179                         return -EOPNOTSUPP;
6180
6181                 expr = nft_set_elem_expr_alloc(ctx, set,
6182                                                nla[NFTA_SET_ELEM_EXPR]);
6183                 if (IS_ERR(expr))
6184                         return PTR_ERR(expr);
6185
6186                 expr_array[0] = expr;
6187                 num_exprs = 1;
6188
6189                 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6190                         err = -EOPNOTSUPP;
6191                         goto err_set_elem_expr;
6192                 }
6193         } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6194                 struct nft_expr *expr;
6195                 struct nlattr *tmp;
6196                 int left;
6197
6198                 i = 0;
6199                 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6200                         if (i == NFT_SET_EXPR_MAX ||
6201                             (set->num_exprs && set->num_exprs == i)) {
6202                                 err = -E2BIG;
6203                                 goto err_set_elem_expr;
6204                         }
6205                         if (nla_type(tmp) != NFTA_LIST_ELEM) {
6206                                 err = -EINVAL;
6207                                 goto err_set_elem_expr;
6208                         }
6209                         expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6210                         if (IS_ERR(expr)) {
6211                                 err = PTR_ERR(expr);
6212                                 goto err_set_elem_expr;
6213                         }
6214                         expr_array[i] = expr;
6215                         num_exprs++;
6216
6217                         if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6218                                 err = -EOPNOTSUPP;
6219                                 goto err_set_elem_expr;
6220                         }
6221                         i++;
6222                 }
6223                 if (set->num_exprs && set->num_exprs != i) {
6224                         err = -EOPNOTSUPP;
6225                         goto err_set_elem_expr;
6226                 }
6227         } else if (set->num_exprs > 0 &&
6228                    !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6229                 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6230                 if (err < 0)
6231                         goto err_set_elem_expr_clone;
6232
6233                 num_exprs = set->num_exprs;
6234         }
6235
6236         if (nla[NFTA_SET_ELEM_KEY]) {
6237                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6238                                             nla[NFTA_SET_ELEM_KEY]);
6239                 if (err < 0)
6240                         goto err_set_elem_expr;
6241
6242                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6243                 if (err < 0)
6244                         goto err_parse_key;
6245         }
6246
6247         if (nla[NFTA_SET_ELEM_KEY_END]) {
6248                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6249                                             nla[NFTA_SET_ELEM_KEY_END]);
6250                 if (err < 0)
6251                         goto err_parse_key;
6252
6253                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6254                 if (err < 0)
6255                         goto err_parse_key_end;
6256         }
6257
6258         if (timeout > 0) {
6259                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6260                 if (err < 0)
6261                         goto err_parse_key_end;
6262
6263                 if (timeout != READ_ONCE(set->timeout)) {
6264                         err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6265                         if (err < 0)
6266                                 goto err_parse_key_end;
6267                 }
6268         }
6269
6270         if (num_exprs) {
6271                 for (i = 0; i < num_exprs; i++)
6272                         size += expr_array[i]->ops->size;
6273
6274                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6275                                              sizeof(struct nft_set_elem_expr) + size);
6276                 if (err < 0)
6277                         goto err_parse_key_end;
6278         }
6279
6280         if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6281                 obj = nft_obj_lookup(ctx->net, ctx->table,
6282                                      nla[NFTA_SET_ELEM_OBJREF],
6283                                      set->objtype, genmask);
6284                 if (IS_ERR(obj)) {
6285                         err = PTR_ERR(obj);
6286                         goto err_parse_key_end;
6287                 }
6288                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6289                 if (err < 0)
6290                         goto err_parse_key_end;
6291         }
6292
6293         if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6294                 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6295                                              nla[NFTA_SET_ELEM_DATA]);
6296                 if (err < 0)
6297                         goto err_parse_key_end;
6298
6299                 dreg = nft_type_to_reg(set->dtype);
6300                 list_for_each_entry(binding, &set->bindings, list) {
6301                         struct nft_ctx bind_ctx = {
6302                                 .net    = ctx->net,
6303                                 .family = ctx->family,
6304                                 .table  = ctx->table,
6305                                 .chain  = (struct nft_chain *)binding->chain,
6306                         };
6307
6308                         if (!(binding->flags & NFT_SET_MAP))
6309                                 continue;
6310
6311                         err = nft_validate_register_store(&bind_ctx, dreg,
6312                                                           &elem.data.val,
6313                                                           desc.type, desc.len);
6314                         if (err < 0)
6315                                 goto err_parse_data;
6316
6317                         if (desc.type == NFT_DATA_VERDICT &&
6318                             (elem.data.val.verdict.code == NFT_GOTO ||
6319                              elem.data.val.verdict.code == NFT_JUMP))
6320                                 nft_validate_state_update(ctx->table,
6321                                                           NFT_VALIDATE_NEED);
6322                 }
6323
6324                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6325                 if (err < 0)
6326                         goto err_parse_data;
6327         }
6328
6329         /* The full maximum length of userdata can exceed the maximum
6330          * offset value (U8_MAX) for following extensions, therefor it
6331          * must be the last extension added.
6332          */
6333         ulen = 0;
6334         if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6335                 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6336                 if (ulen > 0) {
6337                         err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6338                                                      ulen);
6339                         if (err < 0)
6340                                 goto err_parse_data;
6341                 }
6342         }
6343
6344         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6345                                       elem.key_end.val.data, elem.data.val.data,
6346                                       timeout, expiration, GFP_KERNEL_ACCOUNT);
6347         if (IS_ERR(elem.priv)) {
6348                 err = PTR_ERR(elem.priv);
6349                 goto err_parse_data;
6350         }
6351
6352         ext = nft_set_elem_ext(set, elem.priv);
6353         if (flags)
6354                 *nft_set_ext_flags(ext) = flags;
6355
6356         if (ulen > 0) {
6357                 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6358                         err = -EINVAL;
6359                         goto err_elem_userdata;
6360                 }
6361                 udata = nft_set_ext_userdata(ext);
6362                 udata->len = ulen - 1;
6363                 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6364         }
6365         if (obj) {
6366                 *nft_set_ext_obj(ext) = obj;
6367                 obj->use++;
6368         }
6369         err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6370         if (err < 0)
6371                 goto err_elem_free;
6372
6373         trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6374         if (trans == NULL) {
6375                 err = -ENOMEM;
6376                 goto err_elem_free;
6377         }
6378
6379         ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6380
6381         err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6382         if (err) {
6383                 if (err == -EEXIST) {
6384                         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6385                             nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6386                             nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6387                             nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6388                                 goto err_element_clash;
6389                         if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6390                              nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6391                              memcmp(nft_set_ext_data(ext),
6392                                     nft_set_ext_data(ext2), set->dlen) != 0) ||
6393                             (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6394                              nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6395                              *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6396                                 goto err_element_clash;
6397                         else if (!(nlmsg_flags & NLM_F_EXCL))
6398                                 err = 0;
6399                 } else if (err == -ENOTEMPTY) {
6400                         /* ENOTEMPTY reports overlapping between this element
6401                          * and an existing one.
6402                          */
6403                         err = -EEXIST;
6404                 }
6405                 goto err_element_clash;
6406         }
6407
6408         if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6409             !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6410                 err = -ENFILE;
6411                 goto err_set_full;
6412         }
6413
6414         nft_trans_elem(trans) = elem;
6415         nft_trans_commit_list_add_tail(ctx->net, trans);
6416         return 0;
6417
6418 err_set_full:
6419         nft_setelem_remove(ctx->net, set, &elem);
6420 err_element_clash:
6421         kfree(trans);
6422 err_elem_free:
6423         if (obj)
6424                 obj->use--;
6425 err_elem_userdata:
6426         nf_tables_set_elem_destroy(ctx, set, elem.priv);
6427 err_parse_data:
6428         if (nla[NFTA_SET_ELEM_DATA] != NULL)
6429                 nft_data_release(&elem.data.val, desc.type);
6430 err_parse_key_end:
6431         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6432 err_parse_key:
6433         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6434 err_set_elem_expr:
6435         for (i = 0; i < num_exprs && expr_array[i]; i++)
6436                 nft_expr_destroy(ctx, expr_array[i]);
6437 err_set_elem_expr_clone:
6438         return err;
6439 }
6440
6441 static int nf_tables_newsetelem(struct sk_buff *skb,
6442                                 const struct nfnl_info *info,
6443                                 const struct nlattr * const nla[])
6444 {
6445         struct netlink_ext_ack *extack = info->extack;
6446         u8 genmask = nft_genmask_next(info->net);
6447         u8 family = info->nfmsg->nfgen_family;
6448         struct net *net = info->net;
6449         const struct nlattr *attr;
6450         struct nft_table *table;
6451         struct nft_set *set;
6452         struct nft_ctx ctx;
6453         int rem, err;
6454
6455         if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6456                 return -EINVAL;
6457
6458         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6459                                  genmask, NETLINK_CB(skb).portid);
6460         if (IS_ERR(table)) {
6461                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6462                 return PTR_ERR(table);
6463         }
6464
6465         set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6466                                     nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6467         if (IS_ERR(set))
6468                 return PTR_ERR(set);
6469
6470         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6471                 return -EBUSY;
6472
6473         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6474
6475         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6476                 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6477                 if (err < 0) {
6478                         NL_SET_BAD_ATTR(extack, attr);
6479                         return err;
6480                 }
6481         }
6482
6483         if (table->validate_state == NFT_VALIDATE_DO)
6484                 return nft_table_validate(net, table);
6485
6486         return 0;
6487 }
6488
6489 /**
6490  *      nft_data_hold - hold a nft_data item
6491  *
6492  *      @data: struct nft_data to release
6493  *      @type: type of data
6494  *
6495  *      Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6496  *      NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6497  *      NFT_GOTO verdicts. This function must be called on active data objects
6498  *      from the second phase of the commit protocol.
6499  */
6500 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6501 {
6502         struct nft_chain *chain;
6503         struct nft_rule *rule;
6504
6505         if (type == NFT_DATA_VERDICT) {
6506                 switch (data->verdict.code) {
6507                 case NFT_JUMP:
6508                 case NFT_GOTO:
6509                         chain = data->verdict.chain;
6510                         chain->use++;
6511
6512                         if (!nft_chain_is_bound(chain))
6513                                 break;
6514
6515                         chain->table->use++;
6516                         list_for_each_entry(rule, &chain->rules, list)
6517                                 chain->use++;
6518
6519                         nft_chain_add(chain->table, chain);
6520                         break;
6521                 }
6522         }
6523 }
6524
6525 static void nft_setelem_data_activate(const struct net *net,
6526                                       const struct nft_set *set,
6527                                       struct nft_set_elem *elem)
6528 {
6529         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6530
6531         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6532                 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6533         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6534                 (*nft_set_ext_obj(ext))->use++;
6535 }
6536
6537 static void nft_setelem_data_deactivate(const struct net *net,
6538                                         const struct nft_set *set,
6539                                         struct nft_set_elem *elem)
6540 {
6541         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6542
6543         if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6544                 nft_data_release(nft_set_ext_data(ext), set->dtype);
6545         if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6546                 (*nft_set_ext_obj(ext))->use--;
6547 }
6548
6549 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6550                            const struct nlattr *attr)
6551 {
6552         struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6553         struct nft_set_ext_tmpl tmpl;
6554         struct nft_set_elem elem;
6555         struct nft_set_ext *ext;
6556         struct nft_trans *trans;
6557         u32 flags = 0;
6558         int err;
6559
6560         err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6561                                           nft_set_elem_policy, NULL);
6562         if (err < 0)
6563                 return err;
6564
6565         err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6566         if (err < 0)
6567                 return err;
6568
6569         if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6570                 return -EINVAL;
6571
6572         if (!nft_setelem_valid_key_end(set, nla, flags))
6573                 return -EINVAL;
6574
6575         nft_set_ext_prepare(&tmpl);
6576
6577         if (flags != 0) {
6578                 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6579                 if (err < 0)
6580                         return err;
6581         }
6582
6583         if (nla[NFTA_SET_ELEM_KEY]) {
6584                 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6585                                             nla[NFTA_SET_ELEM_KEY]);
6586                 if (err < 0)
6587                         return err;
6588
6589                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6590                 if (err < 0)
6591                         goto fail_elem;
6592         }
6593
6594         if (nla[NFTA_SET_ELEM_KEY_END]) {
6595                 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6596                                             nla[NFTA_SET_ELEM_KEY_END]);
6597                 if (err < 0)
6598                         goto fail_elem;
6599
6600                 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6601                 if (err < 0)
6602                         goto fail_elem_key_end;
6603         }
6604
6605         err = -ENOMEM;
6606         elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6607                                       elem.key_end.val.data, NULL, 0, 0,
6608                                       GFP_KERNEL_ACCOUNT);
6609         if (IS_ERR(elem.priv)) {
6610                 err = PTR_ERR(elem.priv);
6611                 goto fail_elem_key_end;
6612         }
6613
6614         ext = nft_set_elem_ext(set, elem.priv);
6615         if (flags)
6616                 *nft_set_ext_flags(ext) = flags;
6617
6618         trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6619         if (trans == NULL)
6620                 goto fail_trans;
6621
6622         err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6623         if (err < 0)
6624                 goto fail_ops;
6625
6626         nft_setelem_data_deactivate(ctx->net, set, &elem);
6627
6628         nft_trans_elem(trans) = elem;
6629         nft_trans_commit_list_add_tail(ctx->net, trans);
6630         return 0;
6631
6632 fail_ops:
6633         kfree(trans);
6634 fail_trans:
6635         kfree(elem.priv);
6636 fail_elem_key_end:
6637         nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6638 fail_elem:
6639         nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6640         return err;
6641 }
6642
6643 static int nft_setelem_flush(const struct nft_ctx *ctx,
6644                              struct nft_set *set,
6645                              const struct nft_set_iter *iter,
6646                              struct nft_set_elem *elem)
6647 {
6648         struct nft_trans *trans;
6649         int err;
6650
6651         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6652                                     sizeof(struct nft_trans_elem), GFP_ATOMIC);
6653         if (!trans)
6654                 return -ENOMEM;
6655
6656         if (!set->ops->flush(ctx->net, set, elem->priv)) {
6657                 err = -ENOENT;
6658                 goto err1;
6659         }
6660         set->ndeact++;
6661
6662         nft_setelem_data_deactivate(ctx->net, set, elem);
6663         nft_trans_elem_set(trans) = set;
6664         nft_trans_elem(trans) = *elem;
6665         nft_trans_commit_list_add_tail(ctx->net, trans);
6666
6667         return 0;
6668 err1:
6669         kfree(trans);
6670         return err;
6671 }
6672
6673 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6674                                     struct nft_set *set,
6675                                     struct nft_set_elem *elem)
6676 {
6677         struct nft_trans *trans;
6678
6679         trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6680                                     sizeof(struct nft_trans_elem), GFP_KERNEL);
6681         if (!trans)
6682                 return -ENOMEM;
6683
6684         nft_setelem_data_deactivate(ctx->net, set, elem);
6685         nft_trans_elem_set(trans) = set;
6686         nft_trans_elem(trans) = *elem;
6687         nft_trans_commit_list_add_tail(ctx->net, trans);
6688
6689         return 0;
6690 }
6691
6692 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6693                                   struct nft_set *set)
6694 {
6695         u8 genmask = nft_genmask_next(ctx->net);
6696         struct nft_set_elem_catchall *catchall;
6697         struct nft_set_elem elem;
6698         struct nft_set_ext *ext;
6699         int ret = 0;
6700
6701         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6702                 ext = nft_set_elem_ext(set, catchall->elem);
6703                 if (!nft_set_elem_active(ext, genmask) ||
6704                     nft_set_elem_mark_busy(ext))
6705                         continue;
6706
6707                 elem.priv = catchall->elem;
6708                 ret = __nft_set_catchall_flush(ctx, set, &elem);
6709                 if (ret < 0)
6710                         break;
6711         }
6712
6713         return ret;
6714 }
6715
6716 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6717 {
6718         struct nft_set_iter iter = {
6719                 .genmask        = genmask,
6720                 .fn             = nft_setelem_flush,
6721         };
6722
6723         set->ops->walk(ctx, set, &iter);
6724         if (!iter.err)
6725                 iter.err = nft_set_catchall_flush(ctx, set);
6726
6727         return iter.err;
6728 }
6729
6730 static int nf_tables_delsetelem(struct sk_buff *skb,
6731                                 const struct nfnl_info *info,
6732                                 const struct nlattr * const nla[])
6733 {
6734         struct netlink_ext_ack *extack = info->extack;
6735         u8 genmask = nft_genmask_next(info->net);
6736         u8 family = info->nfmsg->nfgen_family;
6737         struct net *net = info->net;
6738         const struct nlattr *attr;
6739         struct nft_table *table;
6740         struct nft_set *set;
6741         struct nft_ctx ctx;
6742         int rem, err = 0;
6743
6744         table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6745                                  genmask, NETLINK_CB(skb).portid);
6746         if (IS_ERR(table)) {
6747                 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6748                 return PTR_ERR(table);
6749         }
6750
6751         set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6752         if (IS_ERR(set))
6753                 return PTR_ERR(set);
6754         if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6755                 return -EBUSY;
6756
6757         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6758
6759         if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6760                 return nft_set_flush(&ctx, set, genmask);
6761
6762         nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6763                 err = nft_del_setelem(&ctx, set, attr);
6764                 if (err == -ENOENT &&
6765                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
6766                         continue;
6767
6768                 if (err < 0) {
6769                         NL_SET_BAD_ATTR(extack, attr);
6770                         break;
6771                 }
6772         }
6773         return err;
6774 }
6775
6776 void nft_set_gc_batch_release(struct rcu_head *rcu)
6777 {
6778         struct nft_set_gc_batch *gcb;
6779         unsigned int i;
6780
6781         gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6782         for (i = 0; i < gcb->head.cnt; i++)
6783                 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6784         kfree(gcb);
6785 }
6786
6787 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6788                                                 gfp_t gfp)
6789 {
6790         struct nft_set_gc_batch *gcb;
6791
6792         gcb = kzalloc(sizeof(*gcb), gfp);
6793         if (gcb == NULL)
6794                 return gcb;
6795         gcb->head.set = set;
6796         return gcb;
6797 }
6798
6799 /*
6800  * Stateful objects
6801  */
6802
6803 /**
6804  *      nft_register_obj- register nf_tables stateful object type
6805  *      @obj_type: object type
6806  *
6807  *      Registers the object type for use with nf_tables. Returns zero on
6808  *      success or a negative errno code otherwise.
6809  */
6810 int nft_register_obj(struct nft_object_type *obj_type)
6811 {
6812         if (obj_type->type == NFT_OBJECT_UNSPEC)
6813                 return -EINVAL;
6814
6815         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6816         list_add_rcu(&obj_type->list, &nf_tables_objects);
6817         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6818         return 0;
6819 }
6820 EXPORT_SYMBOL_GPL(nft_register_obj);
6821
6822 /**
6823  *      nft_unregister_obj - unregister nf_tables object type
6824  *      @obj_type: object type
6825  *
6826  *      Unregisters the object type for use with nf_tables.
6827  */
6828 void nft_unregister_obj(struct nft_object_type *obj_type)
6829 {
6830         nfnl_lock(NFNL_SUBSYS_NFTABLES);
6831         list_del_rcu(&obj_type->list);
6832         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6833 }
6834 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6835
6836 struct nft_object *nft_obj_lookup(const struct net *net,
6837                                   const struct nft_table *table,
6838                                   const struct nlattr *nla, u32 objtype,
6839                                   u8 genmask)
6840 {
6841         struct nft_object_hash_key k = { .table = table };
6842         char search[NFT_OBJ_MAXNAMELEN];
6843         struct rhlist_head *tmp, *list;
6844         struct nft_object *obj;
6845
6846         nla_strscpy(search, nla, sizeof(search));
6847         k.name = search;
6848
6849         WARN_ON_ONCE(!rcu_read_lock_held() &&
6850                      !lockdep_commit_lock_is_held(net));
6851
6852         rcu_read_lock();
6853         list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6854         if (!list)
6855                 goto out;
6856
6857         rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6858                 if (objtype == obj->ops->type->type &&
6859                     nft_active_genmask(obj, genmask)) {
6860                         rcu_read_unlock();
6861                         return obj;
6862                 }
6863         }
6864 out:
6865         rcu_read_unlock();
6866         return ERR_PTR(-ENOENT);
6867 }
6868 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6869
6870 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6871                                                   const struct nlattr *nla,
6872                                                   u32 objtype, u8 genmask)
6873 {
6874         struct nft_object *obj;
6875
6876         list_for_each_entry(obj, &table->objects, list) {
6877                 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6878                     objtype == obj->ops->type->type &&
6879                     nft_active_genmask(obj, genmask))
6880                         return obj;
6881         }
6882         return ERR_PTR(-ENOENT);
6883 }
6884
6885 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6886         [NFTA_OBJ_TABLE]        = { .type = NLA_STRING,
6887                                     .len = NFT_TABLE_MAXNAMELEN - 1 },
6888         [NFTA_OBJ_NAME]         = { .type = NLA_STRING,
6889                                     .len = NFT_OBJ_MAXNAMELEN - 1 },
6890         [NFTA_OBJ_TYPE]         = { .type = NLA_U32 },
6891         [NFTA_OBJ_DATA]         = { .type = NLA_NESTED },
6892         [NFTA_OBJ_HANDLE]       = { .type = NLA_U64},
6893         [NFTA_OBJ_USERDATA]     = { .type = NLA_BINARY,
6894                                     .len = NFT_USERDATA_MAXLEN },
6895 };
6896
6897 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6898                                        const struct nft_object_type *type,
6899                                        const struct nlattr *attr)
6900 {
6901         struct nlattr **tb;
6902         const struct nft_object_ops *ops;
6903         struct nft_object *obj;
6904         int err = -ENOMEM;
6905
6906         tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6907         if (!tb)
6908                 goto err1;
6909
6910         if (attr) {
6911                 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6912                                                   type->policy, NULL);
6913                 if (err < 0)
6914                         goto err2;
6915         } else {
6916                 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6917         }
6918
6919         if (type->select_ops) {
6920                 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6921                 if (IS_ERR(ops)) {
6922                         err = PTR_ERR(ops);
6923                         goto err2;
6924                 }
6925         } else {
6926                 ops = type->ops;
6927         }
6928
6929         err = -ENOMEM;
6930         obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6931         if (!obj)
6932                 goto err2;
6933
6934         err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6935         if (err < 0)
6936                 goto err3;
6937
6938         obj->ops = ops;
6939
6940         kfree(tb);
6941         return obj;
6942 err3:
6943         kfree(obj);
6944 err2:
6945         kfree(tb);
6946 err1:
6947         return ERR_PTR(err);
6948 }
6949
6950 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6951                            struct nft_object *obj, bool reset)
6952 {
6953         struct nlattr *nest;
6954
6955         nest = nla_nest_start_noflag(skb, attr);
6956         if (!nest)
6957                 goto nla_put_failure;
6958         if (obj->ops->dump(skb, obj, reset) < 0)
6959                 goto nla_put_failure;
6960         nla_nest_end(skb, nest);
6961         return 0;
6962
6963 nla_put_failure:
6964         return -1;
6965 }
6966
6967 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6968 {
6969         const struct nft_object_type *type;
6970
6971         list_for_each_entry(type, &nf_tables_objects, list) {
6972                 if (objtype == type->type)
6973                         return type;
6974         }
6975         return NULL;
6976 }
6977
6978 static const struct nft_object_type *
6979 nft_obj_type_get(struct net *net, u32 objtype)
6980 {
6981         const struct nft_object_type *type;
6982
6983         type = __nft_obj_type_get(objtype);
6984         if (type != NULL && try_module_get(type->owner))
6985                 return type;
6986
6987         lockdep_nfnl_nft_mutex_not_held();
6988 #ifdef CONFIG_MODULES
6989         if (type == NULL) {
6990                 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6991                         return ERR_PTR(-EAGAIN);
6992         }
6993 #endif
6994         return ERR_PTR(-ENOENT);
6995 }
6996
6997 static int nf_tables_updobj(const struct nft_ctx *ctx,
6998                             const struct nft_object_type *type,
6999                             const struct nlattr *attr,
7000                             struct nft_object *obj)
7001 {
7002         struct nft_object *newobj;
7003         struct nft_trans *trans;
7004         int err = -ENOMEM;
7005
7006         if (!try_module_get(type->owner))
7007                 return -ENOENT;
7008
7009         trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7010                                 sizeof(struct nft_trans_obj));
7011         if (!trans)
7012                 goto err_trans;
7013
7014         newobj = nft_obj_init(ctx, type, attr);
7015         if (IS_ERR(newobj)) {
7016                 err = PTR_ERR(newobj);
7017                 goto err_free_trans;
7018         }
7019
7020         nft_trans_obj(trans) = obj;
7021         nft_trans_obj_update(trans) = true;
7022         nft_trans_obj_newobj(trans) = newobj;
7023         nft_trans_commit_list_add_tail(ctx->net, trans);
7024
7025         return 0;
7026
7027 err_free_trans:
7028         kfree(trans);
7029 err_trans:
7030         module_put(type->owner);
7031         return err;
7032 }
7033
7034 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7035                             const struct nlattr * const nla[])
7036 {
7037         struct netlink_ext_ack *extack = info->extack;
7038         u8 genmask = nft_genmask_next(info->net);
7039         u8 family = info->nfmsg->nfgen_family;
7040         const struct nft_object_type *type;
7041         struct net *net = info->net;
7042         struct nft_table *table;
7043         struct nft_object *obj;
7044         struct nft_ctx ctx;
7045         u32 objtype;
7046         int err;
7047
7048         if (!nla[NFTA_OBJ_TYPE] ||
7049             !nla[NFTA_OBJ_NAME] ||
7050             !nla[NFTA_OBJ_DATA])
7051                 return -EINVAL;
7052
7053         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7054                                  NETLINK_CB(skb).portid);
7055         if (IS_ERR(table)) {
7056                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7057                 return PTR_ERR(table);
7058         }
7059
7060         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7061         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7062         if (IS_ERR(obj)) {
7063                 err = PTR_ERR(obj);
7064                 if (err != -ENOENT) {
7065                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7066                         return err;
7067                 }
7068         } else {
7069                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7070                         NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7071                         return -EEXIST;
7072                 }
7073                 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7074                         return -EOPNOTSUPP;
7075
7076                 type = __nft_obj_type_get(objtype);
7077                 if (WARN_ON_ONCE(!type))
7078                         return -ENOENT;
7079
7080                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7081
7082                 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7083         }
7084
7085         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7086
7087         type = nft_obj_type_get(net, objtype);
7088         if (IS_ERR(type))
7089                 return PTR_ERR(type);
7090
7091         obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7092         if (IS_ERR(obj)) {
7093                 err = PTR_ERR(obj);
7094                 goto err_init;
7095         }
7096         obj->key.table = table;
7097         obj->handle = nf_tables_alloc_handle(table);
7098
7099         obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7100         if (!obj->key.name) {
7101                 err = -ENOMEM;
7102                 goto err_strdup;
7103         }
7104
7105         if (nla[NFTA_OBJ_USERDATA]) {
7106                 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7107                 if (obj->udata == NULL)
7108                         goto err_userdata;
7109
7110                 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7111         }
7112
7113         err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7114         if (err < 0)
7115                 goto err_trans;
7116
7117         err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7118                               nft_objname_ht_params);
7119         if (err < 0)
7120                 goto err_obj_ht;
7121
7122         list_add_tail_rcu(&obj->list, &table->objects);
7123         table->use++;
7124         return 0;
7125 err_obj_ht:
7126         /* queued in transaction log */
7127         INIT_LIST_HEAD(&obj->list);
7128         return err;
7129 err_trans:
7130         kfree(obj->udata);
7131 err_userdata:
7132         kfree(obj->key.name);
7133 err_strdup:
7134         if (obj->ops->destroy)
7135                 obj->ops->destroy(&ctx, obj);
7136         kfree(obj);
7137 err_init:
7138         module_put(type->owner);
7139         return err;
7140 }
7141
7142 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7143                                    u32 portid, u32 seq, int event, u32 flags,
7144                                    int family, const struct nft_table *table,
7145                                    struct nft_object *obj, bool reset)
7146 {
7147         struct nlmsghdr *nlh;
7148
7149         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7150         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7151                            NFNETLINK_V0, nft_base_seq(net));
7152         if (!nlh)
7153                 goto nla_put_failure;
7154
7155         if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7156             nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7157             nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7158             nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7159             nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
7160             nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7161                          NFTA_OBJ_PAD))
7162                 goto nla_put_failure;
7163
7164         if (obj->udata &&
7165             nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7166                 goto nla_put_failure;
7167
7168         nlmsg_end(skb, nlh);
7169         return 0;
7170
7171 nla_put_failure:
7172         nlmsg_trim(skb, nlh);
7173         return -1;
7174 }
7175
7176 struct nft_obj_filter {
7177         char            *table;
7178         u32             type;
7179 };
7180
7181 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7182 {
7183         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7184         const struct nft_table *table;
7185         unsigned int idx = 0, s_idx = cb->args[0];
7186         struct nft_obj_filter *filter = cb->data;
7187         struct net *net = sock_net(skb->sk);
7188         int family = nfmsg->nfgen_family;
7189         struct nftables_pernet *nft_net;
7190         struct nft_object *obj;
7191         bool reset = false;
7192
7193         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7194                 reset = true;
7195
7196         rcu_read_lock();
7197         nft_net = nft_pernet(net);
7198         cb->seq = READ_ONCE(nft_net->base_seq);
7199
7200         list_for_each_entry_rcu(table, &nft_net->tables, list) {
7201                 if (family != NFPROTO_UNSPEC && family != table->family)
7202                         continue;
7203
7204                 list_for_each_entry_rcu(obj, &table->objects, list) {
7205                         if (!nft_is_active(net, obj))
7206                                 goto cont;
7207                         if (idx < s_idx)
7208                                 goto cont;
7209                         if (idx > s_idx)
7210                                 memset(&cb->args[1], 0,
7211                                        sizeof(cb->args) - sizeof(cb->args[0]));
7212                         if (filter && filter->table &&
7213                             strcmp(filter->table, table->name))
7214                                 goto cont;
7215                         if (filter &&
7216                             filter->type != NFT_OBJECT_UNSPEC &&
7217                             obj->ops->type->type != filter->type)
7218                                 goto cont;
7219                         if (reset) {
7220                                 char *buf = kasprintf(GFP_ATOMIC,
7221                                                       "%s:%u",
7222                                                       table->name,
7223                                                       nft_net->base_seq);
7224
7225                                 audit_log_nfcfg(buf,
7226                                                 family,
7227                                                 obj->handle,
7228                                                 AUDIT_NFT_OP_OBJ_RESET,
7229                                                 GFP_ATOMIC);
7230                                 kfree(buf);
7231                         }
7232
7233                         if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7234                                                     cb->nlh->nlmsg_seq,
7235                                                     NFT_MSG_NEWOBJ,
7236                                                     NLM_F_MULTI | NLM_F_APPEND,
7237                                                     table->family, table,
7238                                                     obj, reset) < 0)
7239                                 goto done;
7240
7241                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7242 cont:
7243                         idx++;
7244                 }
7245         }
7246 done:
7247         rcu_read_unlock();
7248
7249         cb->args[0] = idx;
7250         return skb->len;
7251 }
7252
7253 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7254 {
7255         const struct nlattr * const *nla = cb->data;
7256         struct nft_obj_filter *filter = NULL;
7257
7258         if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7259                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7260                 if (!filter)
7261                         return -ENOMEM;
7262
7263                 if (nla[NFTA_OBJ_TABLE]) {
7264                         filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7265                         if (!filter->table) {
7266                                 kfree(filter);
7267                                 return -ENOMEM;
7268                         }
7269                 }
7270
7271                 if (nla[NFTA_OBJ_TYPE])
7272                         filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7273         }
7274
7275         cb->data = filter;
7276         return 0;
7277 }
7278
7279 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7280 {
7281         struct nft_obj_filter *filter = cb->data;
7282
7283         if (filter) {
7284                 kfree(filter->table);
7285                 kfree(filter);
7286         }
7287
7288         return 0;
7289 }
7290
7291 /* called with rcu_read_lock held */
7292 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7293                             const struct nlattr * const nla[])
7294 {
7295         struct netlink_ext_ack *extack = info->extack;
7296         u8 genmask = nft_genmask_cur(info->net);
7297         u8 family = info->nfmsg->nfgen_family;
7298         const struct nft_table *table;
7299         struct net *net = info->net;
7300         struct nft_object *obj;
7301         struct sk_buff *skb2;
7302         bool reset = false;
7303         u32 objtype;
7304         int err;
7305
7306         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7307                 struct netlink_dump_control c = {
7308                         .start = nf_tables_dump_obj_start,
7309                         .dump = nf_tables_dump_obj,
7310                         .done = nf_tables_dump_obj_done,
7311                         .module = THIS_MODULE,
7312                         .data = (void *)nla,
7313                 };
7314
7315                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7316         }
7317
7318         if (!nla[NFTA_OBJ_NAME] ||
7319             !nla[NFTA_OBJ_TYPE])
7320                 return -EINVAL;
7321
7322         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7323         if (IS_ERR(table)) {
7324                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7325                 return PTR_ERR(table);
7326         }
7327
7328         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7329         obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7330         if (IS_ERR(obj)) {
7331                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7332                 return PTR_ERR(obj);
7333         }
7334
7335         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7336         if (!skb2)
7337                 return -ENOMEM;
7338
7339         if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7340                 reset = true;
7341
7342         if (reset) {
7343                 const struct nftables_pernet *nft_net;
7344                 char *buf;
7345
7346                 nft_net = nft_pernet(net);
7347                 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7348
7349                 audit_log_nfcfg(buf,
7350                                 family,
7351                                 obj->handle,
7352                                 AUDIT_NFT_OP_OBJ_RESET,
7353                                 GFP_ATOMIC);
7354                 kfree(buf);
7355         }
7356
7357         err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7358                                       info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7359                                       family, table, obj, reset);
7360         if (err < 0)
7361                 goto err_fill_obj_info;
7362
7363         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7364
7365 err_fill_obj_info:
7366         kfree_skb(skb2);
7367         return err;
7368 }
7369
7370 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7371 {
7372         if (obj->ops->destroy)
7373                 obj->ops->destroy(ctx, obj);
7374
7375         module_put(obj->ops->type->owner);
7376         kfree(obj->key.name);
7377         kfree(obj->udata);
7378         kfree(obj);
7379 }
7380
7381 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7382                             const struct nlattr * const nla[])
7383 {
7384         struct netlink_ext_ack *extack = info->extack;
7385         u8 genmask = nft_genmask_next(info->net);
7386         u8 family = info->nfmsg->nfgen_family;
7387         struct net *net = info->net;
7388         const struct nlattr *attr;
7389         struct nft_table *table;
7390         struct nft_object *obj;
7391         struct nft_ctx ctx;
7392         u32 objtype;
7393
7394         if (!nla[NFTA_OBJ_TYPE] ||
7395             (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7396                 return -EINVAL;
7397
7398         table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7399                                  NETLINK_CB(skb).portid);
7400         if (IS_ERR(table)) {
7401                 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7402                 return PTR_ERR(table);
7403         }
7404
7405         objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7406         if (nla[NFTA_OBJ_HANDLE]) {
7407                 attr = nla[NFTA_OBJ_HANDLE];
7408                 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7409         } else {
7410                 attr = nla[NFTA_OBJ_NAME];
7411                 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7412         }
7413
7414         if (IS_ERR(obj)) {
7415                 if (PTR_ERR(obj) == -ENOENT &&
7416                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7417                         return 0;
7418
7419                 NL_SET_BAD_ATTR(extack, attr);
7420                 return PTR_ERR(obj);
7421         }
7422         if (obj->use > 0) {
7423                 NL_SET_BAD_ATTR(extack, attr);
7424                 return -EBUSY;
7425         }
7426
7427         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7428
7429         return nft_delobj(&ctx, obj);
7430 }
7431
7432 void nft_obj_notify(struct net *net, const struct nft_table *table,
7433                     struct nft_object *obj, u32 portid, u32 seq, int event,
7434                     u16 flags, int family, int report, gfp_t gfp)
7435 {
7436         struct nftables_pernet *nft_net = nft_pernet(net);
7437         struct sk_buff *skb;
7438         int err;
7439         char *buf = kasprintf(gfp, "%s:%u",
7440                               table->name, nft_net->base_seq);
7441
7442         audit_log_nfcfg(buf,
7443                         family,
7444                         obj->handle,
7445                         event == NFT_MSG_NEWOBJ ?
7446                                  AUDIT_NFT_OP_OBJ_REGISTER :
7447                                  AUDIT_NFT_OP_OBJ_UNREGISTER,
7448                         gfp);
7449         kfree(buf);
7450
7451         if (!report &&
7452             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7453                 return;
7454
7455         skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7456         if (skb == NULL)
7457                 goto err;
7458
7459         err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7460                                       flags & (NLM_F_CREATE | NLM_F_EXCL),
7461                                       family, table, obj, false);
7462         if (err < 0) {
7463                 kfree_skb(skb);
7464                 goto err;
7465         }
7466
7467         nft_notify_enqueue(skb, report, &nft_net->notify_list);
7468         return;
7469 err:
7470         nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7471 }
7472 EXPORT_SYMBOL_GPL(nft_obj_notify);
7473
7474 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7475                                  struct nft_object *obj, int event)
7476 {
7477         nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7478                        ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7479 }
7480
7481 /*
7482  * Flow tables
7483  */
7484 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7485 {
7486         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7487         list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7488         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7489 }
7490 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7491
7492 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7493 {
7494         nfnl_lock(NFNL_SUBSYS_NFTABLES);
7495         list_del_rcu(&type->list);
7496         nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7497 }
7498 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7499
7500 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7501         [NFTA_FLOWTABLE_TABLE]          = { .type = NLA_STRING,
7502                                             .len = NFT_NAME_MAXLEN - 1 },
7503         [NFTA_FLOWTABLE_NAME]           = { .type = NLA_STRING,
7504                                             .len = NFT_NAME_MAXLEN - 1 },
7505         [NFTA_FLOWTABLE_HOOK]           = { .type = NLA_NESTED },
7506         [NFTA_FLOWTABLE_HANDLE]         = { .type = NLA_U64 },
7507         [NFTA_FLOWTABLE_FLAGS]          = { .type = NLA_U32 },
7508 };
7509
7510 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7511                                            const struct nlattr *nla, u8 genmask)
7512 {
7513         struct nft_flowtable *flowtable;
7514
7515         list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7516                 if (!nla_strcmp(nla, flowtable->name) &&
7517                     nft_active_genmask(flowtable, genmask))
7518                         return flowtable;
7519         }
7520         return ERR_PTR(-ENOENT);
7521 }
7522 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7523
7524 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7525                                     struct nft_flowtable *flowtable,
7526                                     enum nft_trans_phase phase)
7527 {
7528         switch (phase) {
7529         case NFT_TRANS_PREPARE:
7530         case NFT_TRANS_ABORT:
7531         case NFT_TRANS_RELEASE:
7532                 flowtable->use--;
7533                 fallthrough;
7534         default:
7535                 return;
7536         }
7537 }
7538 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7539
7540 static struct nft_flowtable *
7541 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7542                               const struct nlattr *nla, u8 genmask)
7543 {
7544        struct nft_flowtable *flowtable;
7545
7546        list_for_each_entry(flowtable, &table->flowtables, list) {
7547                if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7548                    nft_active_genmask(flowtable, genmask))
7549                        return flowtable;
7550        }
7551        return ERR_PTR(-ENOENT);
7552 }
7553
7554 struct nft_flowtable_hook {
7555         u32                     num;
7556         int                     priority;
7557         struct list_head        list;
7558 };
7559
7560 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7561         [NFTA_FLOWTABLE_HOOK_NUM]       = { .type = NLA_U32 },
7562         [NFTA_FLOWTABLE_HOOK_PRIORITY]  = { .type = NLA_U32 },
7563         [NFTA_FLOWTABLE_HOOK_DEVS]      = { .type = NLA_NESTED },
7564 };
7565
7566 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7567                                     const struct nlattr *attr,
7568                                     struct nft_flowtable_hook *flowtable_hook,
7569                                     struct nft_flowtable *flowtable,
7570                                     struct netlink_ext_ack *extack, bool add)
7571 {
7572         struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7573         struct nft_hook *hook;
7574         int hooknum, priority;
7575         int err;
7576
7577         INIT_LIST_HEAD(&flowtable_hook->list);
7578
7579         err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7580                                           nft_flowtable_hook_policy, NULL);
7581         if (err < 0)
7582                 return err;
7583
7584         if (add) {
7585                 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7586                     !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7587                         return -EINVAL;
7588
7589                 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7590                 if (hooknum != NF_NETDEV_INGRESS)
7591                         return -EOPNOTSUPP;
7592
7593                 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7594
7595                 flowtable_hook->priority        = priority;
7596                 flowtable_hook->num             = hooknum;
7597         } else {
7598                 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7599                         hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7600                         if (hooknum != flowtable->hooknum)
7601                                 return -EOPNOTSUPP;
7602                 }
7603
7604                 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7605                         priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7606                         if (priority != flowtable->data.priority)
7607                                 return -EOPNOTSUPP;
7608                 }
7609
7610                 flowtable_hook->priority        = flowtable->data.priority;
7611                 flowtable_hook->num             = flowtable->hooknum;
7612         }
7613
7614         if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7615                 err = nf_tables_parse_netdev_hooks(ctx->net,
7616                                                    tb[NFTA_FLOWTABLE_HOOK_DEVS],
7617                                                    &flowtable_hook->list,
7618                                                    extack);
7619                 if (err < 0)
7620                         return err;
7621         }
7622
7623         list_for_each_entry(hook, &flowtable_hook->list, list) {
7624                 hook->ops.pf            = NFPROTO_NETDEV;
7625                 hook->ops.hooknum       = flowtable_hook->num;
7626                 hook->ops.priority      = flowtable_hook->priority;
7627                 hook->ops.priv          = &flowtable->data;
7628                 hook->ops.hook          = flowtable->data.type->hook;
7629         }
7630
7631         return err;
7632 }
7633
7634 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7635 {
7636         const struct nf_flowtable_type *type;
7637
7638         list_for_each_entry(type, &nf_tables_flowtables, list) {
7639                 if (family == type->family)
7640                         return type;
7641         }
7642         return NULL;
7643 }
7644
7645 static const struct nf_flowtable_type *
7646 nft_flowtable_type_get(struct net *net, u8 family)
7647 {
7648         const struct nf_flowtable_type *type;
7649
7650         type = __nft_flowtable_type_get(family);
7651         if (type != NULL && try_module_get(type->owner))
7652                 return type;
7653
7654         lockdep_nfnl_nft_mutex_not_held();
7655 #ifdef CONFIG_MODULES
7656         if (type == NULL) {
7657                 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7658                         return ERR_PTR(-EAGAIN);
7659         }
7660 #endif
7661         return ERR_PTR(-ENOENT);
7662 }
7663
7664 /* Only called from error and netdev event paths. */
7665 static void nft_unregister_flowtable_hook(struct net *net,
7666                                           struct nft_flowtable *flowtable,
7667                                           struct nft_hook *hook)
7668 {
7669         nf_unregister_net_hook(net, &hook->ops);
7670         flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7671                                     FLOW_BLOCK_UNBIND);
7672 }
7673
7674 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7675                                                  struct list_head *hook_list,
7676                                                  bool release_netdev)
7677 {
7678         struct nft_hook *hook, *next;
7679
7680         list_for_each_entry_safe(hook, next, hook_list, list) {
7681                 nf_unregister_net_hook(net, &hook->ops);
7682                 if (release_netdev) {
7683                         list_del(&hook->list);
7684                         kfree_rcu(hook, rcu);
7685                 }
7686         }
7687 }
7688
7689 static void nft_unregister_flowtable_net_hooks(struct net *net,
7690                                                struct list_head *hook_list)
7691 {
7692         __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7693 }
7694
7695 static int nft_register_flowtable_net_hooks(struct net *net,
7696                                             struct nft_table *table,
7697                                             struct list_head *hook_list,
7698                                             struct nft_flowtable *flowtable)
7699 {
7700         struct nft_hook *hook, *hook2, *next;
7701         struct nft_flowtable *ft;
7702         int err, i = 0;
7703
7704         list_for_each_entry(hook, hook_list, list) {
7705                 list_for_each_entry(ft, &table->flowtables, list) {
7706                         if (!nft_is_active_next(net, ft))
7707                                 continue;
7708
7709                         list_for_each_entry(hook2, &ft->hook_list, list) {
7710                                 if (hook->ops.dev == hook2->ops.dev &&
7711                                     hook->ops.pf == hook2->ops.pf) {
7712                                         err = -EEXIST;
7713                                         goto err_unregister_net_hooks;
7714                                 }
7715                         }
7716                 }
7717
7718                 err = flowtable->data.type->setup(&flowtable->data,
7719                                                   hook->ops.dev,
7720                                                   FLOW_BLOCK_BIND);
7721                 if (err < 0)
7722                         goto err_unregister_net_hooks;
7723
7724                 err = nf_register_net_hook(net, &hook->ops);
7725                 if (err < 0) {
7726                         flowtable->data.type->setup(&flowtable->data,
7727                                                     hook->ops.dev,
7728                                                     FLOW_BLOCK_UNBIND);
7729                         goto err_unregister_net_hooks;
7730                 }
7731
7732                 i++;
7733         }
7734
7735         return 0;
7736
7737 err_unregister_net_hooks:
7738         list_for_each_entry_safe(hook, next, hook_list, list) {
7739                 if (i-- <= 0)
7740                         break;
7741
7742                 nft_unregister_flowtable_hook(net, flowtable, hook);
7743                 list_del_rcu(&hook->list);
7744                 kfree_rcu(hook, rcu);
7745         }
7746
7747         return err;
7748 }
7749
7750 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7751 {
7752         struct nft_hook *hook, *next;
7753
7754         list_for_each_entry_safe(hook, next, hook_list, list) {
7755                 list_del_rcu(&hook->list);
7756                 kfree_rcu(hook, rcu);
7757         }
7758 }
7759
7760 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7761                                 struct nft_flowtable *flowtable,
7762                                 struct netlink_ext_ack *extack)
7763 {
7764         const struct nlattr * const *nla = ctx->nla;
7765         struct nft_flowtable_hook flowtable_hook;
7766         struct nft_hook *hook, *next;
7767         struct nft_trans *trans;
7768         bool unregister = false;
7769         u32 flags;
7770         int err;
7771
7772         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7773                                        &flowtable_hook, flowtable, extack, false);
7774         if (err < 0)
7775                 return err;
7776
7777         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7778                 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7779                         list_del(&hook->list);
7780                         kfree(hook);
7781                 }
7782         }
7783
7784         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7785                 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7786                 if (flags & ~NFT_FLOWTABLE_MASK) {
7787                         err = -EOPNOTSUPP;
7788                         goto err_flowtable_update_hook;
7789                 }
7790                 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7791                     (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7792                         err = -EOPNOTSUPP;
7793                         goto err_flowtable_update_hook;
7794                 }
7795         } else {
7796                 flags = flowtable->data.flags;
7797         }
7798
7799         err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7800                                                &flowtable_hook.list, flowtable);
7801         if (err < 0)
7802                 goto err_flowtable_update_hook;
7803
7804         trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7805                                 sizeof(struct nft_trans_flowtable));
7806         if (!trans) {
7807                 unregister = true;
7808                 err = -ENOMEM;
7809                 goto err_flowtable_update_hook;
7810         }
7811
7812         nft_trans_flowtable_flags(trans) = flags;
7813         nft_trans_flowtable(trans) = flowtable;
7814         nft_trans_flowtable_update(trans) = true;
7815         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7816         list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7817
7818         nft_trans_commit_list_add_tail(ctx->net, trans);
7819
7820         return 0;
7821
7822 err_flowtable_update_hook:
7823         list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7824                 if (unregister)
7825                         nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7826                 list_del_rcu(&hook->list);
7827                 kfree_rcu(hook, rcu);
7828         }
7829
7830         return err;
7831
7832 }
7833
7834 static int nf_tables_newflowtable(struct sk_buff *skb,
7835                                   const struct nfnl_info *info,
7836                                   const struct nlattr * const nla[])
7837 {
7838         struct netlink_ext_ack *extack = info->extack;
7839         struct nft_flowtable_hook flowtable_hook;
7840         u8 genmask = nft_genmask_next(info->net);
7841         u8 family = info->nfmsg->nfgen_family;
7842         const struct nf_flowtable_type *type;
7843         struct nft_flowtable *flowtable;
7844         struct nft_hook *hook, *next;
7845         struct net *net = info->net;
7846         struct nft_table *table;
7847         struct nft_ctx ctx;
7848         int err;
7849
7850         if (!nla[NFTA_FLOWTABLE_TABLE] ||
7851             !nla[NFTA_FLOWTABLE_NAME] ||
7852             !nla[NFTA_FLOWTABLE_HOOK])
7853                 return -EINVAL;
7854
7855         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7856                                  genmask, NETLINK_CB(skb).portid);
7857         if (IS_ERR(table)) {
7858                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7859                 return PTR_ERR(table);
7860         }
7861
7862         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7863                                          genmask);
7864         if (IS_ERR(flowtable)) {
7865                 err = PTR_ERR(flowtable);
7866                 if (err != -ENOENT) {
7867                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7868                         return err;
7869                 }
7870         } else {
7871                 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7872                         NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7873                         return -EEXIST;
7874                 }
7875
7876                 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7877
7878                 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
7879         }
7880
7881         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7882
7883         flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7884         if (!flowtable)
7885                 return -ENOMEM;
7886
7887         flowtable->table = table;
7888         flowtable->handle = nf_tables_alloc_handle(table);
7889         INIT_LIST_HEAD(&flowtable->hook_list);
7890
7891         flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7892         if (!flowtable->name) {
7893                 err = -ENOMEM;
7894                 goto err1;
7895         }
7896
7897         type = nft_flowtable_type_get(net, family);
7898         if (IS_ERR(type)) {
7899                 err = PTR_ERR(type);
7900                 goto err2;
7901         }
7902
7903         if (nla[NFTA_FLOWTABLE_FLAGS]) {
7904                 flowtable->data.flags =
7905                         ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7906                 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7907                         err = -EOPNOTSUPP;
7908                         goto err3;
7909                 }
7910         }
7911
7912         write_pnet(&flowtable->data.net, net);
7913         flowtable->data.type = type;
7914         err = type->init(&flowtable->data);
7915         if (err < 0)
7916                 goto err3;
7917
7918         err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7919                                        &flowtable_hook, flowtable, extack, true);
7920         if (err < 0)
7921                 goto err4;
7922
7923         list_splice(&flowtable_hook.list, &flowtable->hook_list);
7924         flowtable->data.priority = flowtable_hook.priority;
7925         flowtable->hooknum = flowtable_hook.num;
7926
7927         err = nft_register_flowtable_net_hooks(ctx.net, table,
7928                                                &flowtable->hook_list,
7929                                                flowtable);
7930         if (err < 0) {
7931                 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7932                 goto err4;
7933         }
7934
7935         err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7936         if (err < 0)
7937                 goto err5;
7938
7939         list_add_tail_rcu(&flowtable->list, &table->flowtables);
7940         table->use++;
7941
7942         return 0;
7943 err5:
7944         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7945                 nft_unregister_flowtable_hook(net, flowtable, hook);
7946                 list_del_rcu(&hook->list);
7947                 kfree_rcu(hook, rcu);
7948         }
7949 err4:
7950         flowtable->data.type->free(&flowtable->data);
7951 err3:
7952         module_put(type->owner);
7953 err2:
7954         kfree(flowtable->name);
7955 err1:
7956         kfree(flowtable);
7957         return err;
7958 }
7959
7960 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7961 {
7962         struct nft_hook *this, *next;
7963
7964         list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7965                 list_del(&this->list);
7966                 kfree(this);
7967         }
7968 }
7969
7970 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7971                                  struct nft_flowtable *flowtable,
7972                                  struct netlink_ext_ack *extack)
7973 {
7974         const struct nlattr * const *nla = ctx->nla;
7975         struct nft_flowtable_hook flowtable_hook;
7976         LIST_HEAD(flowtable_del_list);
7977         struct nft_hook *this, *hook;
7978         struct nft_trans *trans;
7979         int err;
7980
7981         err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7982                                        &flowtable_hook, flowtable, extack, false);
7983         if (err < 0)
7984                 return err;
7985
7986         list_for_each_entry(this, &flowtable_hook.list, list) {
7987                 hook = nft_hook_list_find(&flowtable->hook_list, this);
7988                 if (!hook) {
7989                         err = -ENOENT;
7990                         goto err_flowtable_del_hook;
7991                 }
7992                 list_move(&hook->list, &flowtable_del_list);
7993         }
7994
7995         trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7996                                 sizeof(struct nft_trans_flowtable));
7997         if (!trans) {
7998                 err = -ENOMEM;
7999                 goto err_flowtable_del_hook;
8000         }
8001
8002         nft_trans_flowtable(trans) = flowtable;
8003         nft_trans_flowtable_update(trans) = true;
8004         INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8005         list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8006         nft_flowtable_hook_release(&flowtable_hook);
8007
8008         nft_trans_commit_list_add_tail(ctx->net, trans);
8009
8010         return 0;
8011
8012 err_flowtable_del_hook:
8013         list_splice(&flowtable_del_list, &flowtable->hook_list);
8014         nft_flowtable_hook_release(&flowtable_hook);
8015
8016         return err;
8017 }
8018
8019 static int nf_tables_delflowtable(struct sk_buff *skb,
8020                                   const struct nfnl_info *info,
8021                                   const struct nlattr * const nla[])
8022 {
8023         struct netlink_ext_ack *extack = info->extack;
8024         u8 genmask = nft_genmask_next(info->net);
8025         u8 family = info->nfmsg->nfgen_family;
8026         struct nft_flowtable *flowtable;
8027         struct net *net = info->net;
8028         const struct nlattr *attr;
8029         struct nft_table *table;
8030         struct nft_ctx ctx;
8031
8032         if (!nla[NFTA_FLOWTABLE_TABLE] ||
8033             (!nla[NFTA_FLOWTABLE_NAME] &&
8034              !nla[NFTA_FLOWTABLE_HANDLE]))
8035                 return -EINVAL;
8036
8037         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8038                                  genmask, NETLINK_CB(skb).portid);
8039         if (IS_ERR(table)) {
8040                 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8041                 return PTR_ERR(table);
8042         }
8043
8044         if (nla[NFTA_FLOWTABLE_HANDLE]) {
8045                 attr = nla[NFTA_FLOWTABLE_HANDLE];
8046                 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8047         } else {
8048                 attr = nla[NFTA_FLOWTABLE_NAME];
8049                 flowtable = nft_flowtable_lookup(table, attr, genmask);
8050         }
8051
8052         if (IS_ERR(flowtable)) {
8053                 if (PTR_ERR(flowtable) == -ENOENT &&
8054                     NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8055                         return 0;
8056
8057                 NL_SET_BAD_ATTR(extack, attr);
8058                 return PTR_ERR(flowtable);
8059         }
8060
8061         nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8062
8063         if (nla[NFTA_FLOWTABLE_HOOK])
8064                 return nft_delflowtable_hook(&ctx, flowtable, extack);
8065
8066         if (flowtable->use > 0) {
8067                 NL_SET_BAD_ATTR(extack, attr);
8068                 return -EBUSY;
8069         }
8070
8071         return nft_delflowtable(&ctx, flowtable);
8072 }
8073
8074 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8075                                          u32 portid, u32 seq, int event,
8076                                          u32 flags, int family,
8077                                          struct nft_flowtable *flowtable,
8078                                          struct list_head *hook_list)
8079 {
8080         struct nlattr *nest, *nest_devs;
8081         struct nft_hook *hook;
8082         struct nlmsghdr *nlh;
8083
8084         event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8085         nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8086                            NFNETLINK_V0, nft_base_seq(net));
8087         if (!nlh)
8088                 goto nla_put_failure;
8089
8090         if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8091             nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8092             nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8093             nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8094                          NFTA_FLOWTABLE_PAD) ||
8095             nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8096                 goto nla_put_failure;
8097
8098         nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8099         if (!nest)
8100                 goto nla_put_failure;
8101         if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8102             nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8103                 goto nla_put_failure;
8104
8105         nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8106         if (!nest_devs)
8107                 goto nla_put_failure;
8108
8109         list_for_each_entry_rcu(hook, hook_list, list) {
8110                 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8111                         goto nla_put_failure;
8112         }
8113         nla_nest_end(skb, nest_devs);
8114         nla_nest_end(skb, nest);
8115
8116         nlmsg_end(skb, nlh);
8117         return 0;
8118
8119 nla_put_failure:
8120         nlmsg_trim(skb, nlh);
8121         return -1;
8122 }
8123
8124 struct nft_flowtable_filter {
8125         char            *table;
8126 };
8127
8128 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8129                                     struct netlink_callback *cb)
8130 {
8131         const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8132         struct nft_flowtable_filter *filter = cb->data;
8133         unsigned int idx = 0, s_idx = cb->args[0];
8134         struct net *net = sock_net(skb->sk);
8135         int family = nfmsg->nfgen_family;
8136         struct nft_flowtable *flowtable;
8137         struct nftables_pernet *nft_net;
8138         const struct nft_table *table;
8139
8140         rcu_read_lock();
8141         nft_net = nft_pernet(net);
8142         cb->seq = READ_ONCE(nft_net->base_seq);
8143
8144         list_for_each_entry_rcu(table, &nft_net->tables, list) {
8145                 if (family != NFPROTO_UNSPEC && family != table->family)
8146                         continue;
8147
8148                 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8149                         if (!nft_is_active(net, flowtable))
8150                                 goto cont;
8151                         if (idx < s_idx)
8152                                 goto cont;
8153                         if (idx > s_idx)
8154                                 memset(&cb->args[1], 0,
8155                                        sizeof(cb->args) - sizeof(cb->args[0]));
8156                         if (filter && filter->table &&
8157                             strcmp(filter->table, table->name))
8158                                 goto cont;
8159
8160                         if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8161                                                           cb->nlh->nlmsg_seq,
8162                                                           NFT_MSG_NEWFLOWTABLE,
8163                                                           NLM_F_MULTI | NLM_F_APPEND,
8164                                                           table->family,
8165                                                           flowtable,
8166                                                           &flowtable->hook_list) < 0)
8167                                 goto done;
8168
8169                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8170 cont:
8171                         idx++;
8172                 }
8173         }
8174 done:
8175         rcu_read_unlock();
8176
8177         cb->args[0] = idx;
8178         return skb->len;
8179 }
8180
8181 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8182 {
8183         const struct nlattr * const *nla = cb->data;
8184         struct nft_flowtable_filter *filter = NULL;
8185
8186         if (nla[NFTA_FLOWTABLE_TABLE]) {
8187                 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8188                 if (!filter)
8189                         return -ENOMEM;
8190
8191                 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8192                                            GFP_ATOMIC);
8193                 if (!filter->table) {
8194                         kfree(filter);
8195                         return -ENOMEM;
8196                 }
8197         }
8198
8199         cb->data = filter;
8200         return 0;
8201 }
8202
8203 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8204 {
8205         struct nft_flowtable_filter *filter = cb->data;
8206
8207         if (!filter)
8208                 return 0;
8209
8210         kfree(filter->table);
8211         kfree(filter);
8212
8213         return 0;
8214 }
8215
8216 /* called with rcu_read_lock held */
8217 static int nf_tables_getflowtable(struct sk_buff *skb,
8218                                   const struct nfnl_info *info,
8219                                   const struct nlattr * const nla[])
8220 {
8221         u8 genmask = nft_genmask_cur(info->net);
8222         u8 family = info->nfmsg->nfgen_family;
8223         struct nft_flowtable *flowtable;
8224         const struct nft_table *table;
8225         struct net *net = info->net;
8226         struct sk_buff *skb2;
8227         int err;
8228
8229         if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8230                 struct netlink_dump_control c = {
8231                         .start = nf_tables_dump_flowtable_start,
8232                         .dump = nf_tables_dump_flowtable,
8233                         .done = nf_tables_dump_flowtable_done,
8234                         .module = THIS_MODULE,
8235                         .data = (void *)nla,
8236                 };
8237
8238                 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8239         }
8240
8241         if (!nla[NFTA_FLOWTABLE_NAME])
8242                 return -EINVAL;
8243
8244         table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8245                                  genmask, 0);
8246         if (IS_ERR(table))
8247                 return PTR_ERR(table);
8248
8249         flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8250                                          genmask);
8251         if (IS_ERR(flowtable))
8252                 return PTR_ERR(flowtable);
8253
8254         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8255         if (!skb2)
8256                 return -ENOMEM;
8257
8258         err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8259                                             info->nlh->nlmsg_seq,
8260                                             NFT_MSG_NEWFLOWTABLE, 0, family,
8261                                             flowtable, &flowtable->hook_list);
8262         if (err < 0)
8263                 goto err_fill_flowtable_info;
8264
8265         return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8266
8267 err_fill_flowtable_info:
8268         kfree_skb(skb2);
8269         return err;
8270 }
8271
8272 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8273                                        struct nft_flowtable *flowtable,
8274                                        struct list_head *hook_list,
8275                                        int event)
8276 {
8277         struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8278         struct sk_buff *skb;
8279         u16 flags = 0;
8280         int err;
8281
8282         if (!ctx->report &&
8283             !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8284                 return;
8285
8286         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8287         if (skb == NULL)
8288                 goto err;
8289
8290         if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8291                 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8292
8293         err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8294                                             ctx->seq, event, flags,
8295                                             ctx->family, flowtable, hook_list);
8296         if (err < 0) {
8297                 kfree_skb(skb);
8298                 goto err;
8299         }
8300
8301         nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8302         return;
8303 err:
8304         nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8305 }
8306
8307 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8308 {
8309         struct nft_hook *hook, *next;
8310
8311         flowtable->data.type->free(&flowtable->data);
8312         list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8313                 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8314                                             FLOW_BLOCK_UNBIND);
8315                 list_del_rcu(&hook->list);
8316                 kfree(hook);
8317         }
8318         kfree(flowtable->name);
8319         module_put(flowtable->data.type->owner);
8320         kfree(flowtable);
8321 }
8322
8323 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8324                                    u32 portid, u32 seq)
8325 {
8326         struct nftables_pernet *nft_net = nft_pernet(net);
8327         struct nlmsghdr *nlh;
8328         char buf[TASK_COMM_LEN];
8329         int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8330
8331         nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8332                            NFNETLINK_V0, nft_base_seq(net));
8333         if (!nlh)
8334                 goto nla_put_failure;
8335
8336         if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8337             nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8338             nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8339                 goto nla_put_failure;
8340
8341         nlmsg_end(skb, nlh);
8342         return 0;
8343
8344 nla_put_failure:
8345         nlmsg_trim(skb, nlh);
8346         return -EMSGSIZE;
8347 }
8348
8349 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8350                                 struct nft_flowtable *flowtable)
8351 {
8352         struct nft_hook *hook;
8353
8354         list_for_each_entry(hook, &flowtable->hook_list, list) {
8355                 if (hook->ops.dev != dev)
8356                         continue;
8357
8358                 /* flow_offload_netdev_event() cleans up entries for us. */
8359                 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8360                 list_del_rcu(&hook->list);
8361                 kfree_rcu(hook, rcu);
8362                 break;
8363         }
8364 }
8365
8366 static int nf_tables_flowtable_event(struct notifier_block *this,
8367                                      unsigned long event, void *ptr)
8368 {
8369         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8370         struct nft_flowtable *flowtable;
8371         struct nftables_pernet *nft_net;
8372         struct nft_table *table;
8373         struct net *net;
8374
8375         if (event != NETDEV_UNREGISTER)
8376                 return 0;
8377
8378         net = dev_net(dev);
8379         nft_net = nft_pernet(net);
8380         mutex_lock(&nft_net->commit_mutex);
8381         list_for_each_entry(table, &nft_net->tables, list) {
8382                 list_for_each_entry(flowtable, &table->flowtables, list) {
8383                         nft_flowtable_event(event, dev, flowtable);
8384                 }
8385         }
8386         mutex_unlock(&nft_net->commit_mutex);
8387
8388         return NOTIFY_DONE;
8389 }
8390
8391 static struct notifier_block nf_tables_flowtable_notifier = {
8392         .notifier_call  = nf_tables_flowtable_event,
8393 };
8394
8395 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8396                                  int event)
8397 {
8398         struct nlmsghdr *nlh = nlmsg_hdr(skb);
8399         struct sk_buff *skb2;
8400         int err;
8401
8402         if (!nlmsg_report(nlh) &&
8403             !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8404                 return;
8405
8406         skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8407         if (skb2 == NULL)
8408                 goto err;
8409
8410         err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8411                                       nlh->nlmsg_seq);
8412         if (err < 0) {
8413                 kfree_skb(skb2);
8414                 goto err;
8415         }
8416
8417         nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8418                        nlmsg_report(nlh), GFP_KERNEL);
8419         return;
8420 err:
8421         nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8422                           -ENOBUFS);
8423 }
8424
8425 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8426                             const struct nlattr * const nla[])
8427 {
8428         struct sk_buff *skb2;
8429         int err;
8430
8431         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8432         if (skb2 == NULL)
8433                 return -ENOMEM;
8434
8435         err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8436                                       info->nlh->nlmsg_seq);
8437         if (err < 0)
8438                 goto err_fill_gen_info;
8439
8440         return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8441
8442 err_fill_gen_info:
8443         kfree_skb(skb2);
8444         return err;
8445 }
8446
8447 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8448         [NFT_MSG_NEWTABLE] = {
8449                 .call           = nf_tables_newtable,
8450                 .type           = NFNL_CB_BATCH,
8451                 .attr_count     = NFTA_TABLE_MAX,
8452                 .policy         = nft_table_policy,
8453         },
8454         [NFT_MSG_GETTABLE] = {
8455                 .call           = nf_tables_gettable,
8456                 .type           = NFNL_CB_RCU,
8457                 .attr_count     = NFTA_TABLE_MAX,
8458                 .policy         = nft_table_policy,
8459         },
8460         [NFT_MSG_DELTABLE] = {
8461                 .call           = nf_tables_deltable,
8462                 .type           = NFNL_CB_BATCH,
8463                 .attr_count     = NFTA_TABLE_MAX,
8464                 .policy         = nft_table_policy,
8465         },
8466         [NFT_MSG_DESTROYTABLE] = {
8467                 .call           = nf_tables_deltable,
8468                 .type           = NFNL_CB_BATCH,
8469                 .attr_count     = NFTA_TABLE_MAX,
8470                 .policy         = nft_table_policy,
8471         },
8472         [NFT_MSG_NEWCHAIN] = {
8473                 .call           = nf_tables_newchain,
8474                 .type           = NFNL_CB_BATCH,
8475                 .attr_count     = NFTA_CHAIN_MAX,
8476                 .policy         = nft_chain_policy,
8477         },
8478         [NFT_MSG_GETCHAIN] = {
8479                 .call           = nf_tables_getchain,
8480                 .type           = NFNL_CB_RCU,
8481                 .attr_count     = NFTA_CHAIN_MAX,
8482                 .policy         = nft_chain_policy,
8483         },
8484         [NFT_MSG_DELCHAIN] = {
8485                 .call           = nf_tables_delchain,
8486                 .type           = NFNL_CB_BATCH,
8487                 .attr_count     = NFTA_CHAIN_MAX,
8488                 .policy         = nft_chain_policy,
8489         },
8490         [NFT_MSG_DESTROYCHAIN] = {
8491                 .call           = nf_tables_delchain,
8492                 .type           = NFNL_CB_BATCH,
8493                 .attr_count     = NFTA_CHAIN_MAX,
8494                 .policy         = nft_chain_policy,
8495         },
8496         [NFT_MSG_NEWRULE] = {
8497                 .call           = nf_tables_newrule,
8498                 .type           = NFNL_CB_BATCH,
8499                 .attr_count     = NFTA_RULE_MAX,
8500                 .policy         = nft_rule_policy,
8501         },
8502         [NFT_MSG_GETRULE] = {
8503                 .call           = nf_tables_getrule,
8504                 .type           = NFNL_CB_RCU,
8505                 .attr_count     = NFTA_RULE_MAX,
8506                 .policy         = nft_rule_policy,
8507         },
8508         [NFT_MSG_GETRULE_RESET] = {
8509                 .call           = nf_tables_getrule,
8510                 .type           = NFNL_CB_RCU,
8511                 .attr_count     = NFTA_RULE_MAX,
8512                 .policy         = nft_rule_policy,
8513         },
8514         [NFT_MSG_DELRULE] = {
8515                 .call           = nf_tables_delrule,
8516                 .type           = NFNL_CB_BATCH,
8517                 .attr_count     = NFTA_RULE_MAX,
8518                 .policy         = nft_rule_policy,
8519         },
8520         [NFT_MSG_DESTROYRULE] = {
8521                 .call           = nf_tables_delrule,
8522                 .type           = NFNL_CB_BATCH,
8523                 .attr_count     = NFTA_RULE_MAX,
8524                 .policy         = nft_rule_policy,
8525         },
8526         [NFT_MSG_NEWSET] = {
8527                 .call           = nf_tables_newset,
8528                 .type           = NFNL_CB_BATCH,
8529                 .attr_count     = NFTA_SET_MAX,
8530                 .policy         = nft_set_policy,
8531         },
8532         [NFT_MSG_GETSET] = {
8533                 .call           = nf_tables_getset,
8534                 .type           = NFNL_CB_RCU,
8535                 .attr_count     = NFTA_SET_MAX,
8536                 .policy         = nft_set_policy,
8537         },
8538         [NFT_MSG_DELSET] = {
8539                 .call           = nf_tables_delset,
8540                 .type           = NFNL_CB_BATCH,
8541                 .attr_count     = NFTA_SET_MAX,
8542                 .policy         = nft_set_policy,
8543         },
8544         [NFT_MSG_DESTROYSET] = {
8545                 .call           = nf_tables_delset,
8546                 .type           = NFNL_CB_BATCH,
8547                 .attr_count     = NFTA_SET_MAX,
8548                 .policy         = nft_set_policy,
8549         },
8550         [NFT_MSG_NEWSETELEM] = {
8551                 .call           = nf_tables_newsetelem,
8552                 .type           = NFNL_CB_BATCH,
8553                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8554                 .policy         = nft_set_elem_list_policy,
8555         },
8556         [NFT_MSG_GETSETELEM] = {
8557                 .call           = nf_tables_getsetelem,
8558                 .type           = NFNL_CB_RCU,
8559                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8560                 .policy         = nft_set_elem_list_policy,
8561         },
8562         [NFT_MSG_DELSETELEM] = {
8563                 .call           = nf_tables_delsetelem,
8564                 .type           = NFNL_CB_BATCH,
8565                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8566                 .policy         = nft_set_elem_list_policy,
8567         },
8568         [NFT_MSG_DESTROYSETELEM] = {
8569                 .call           = nf_tables_delsetelem,
8570                 .type           = NFNL_CB_BATCH,
8571                 .attr_count     = NFTA_SET_ELEM_LIST_MAX,
8572                 .policy         = nft_set_elem_list_policy,
8573         },
8574         [NFT_MSG_GETGEN] = {
8575                 .call           = nf_tables_getgen,
8576                 .type           = NFNL_CB_RCU,
8577         },
8578         [NFT_MSG_NEWOBJ] = {
8579                 .call           = nf_tables_newobj,
8580                 .type           = NFNL_CB_BATCH,
8581                 .attr_count     = NFTA_OBJ_MAX,
8582                 .policy         = nft_obj_policy,
8583         },
8584         [NFT_MSG_GETOBJ] = {
8585                 .call           = nf_tables_getobj,
8586                 .type           = NFNL_CB_RCU,
8587                 .attr_count     = NFTA_OBJ_MAX,
8588                 .policy         = nft_obj_policy,
8589         },
8590         [NFT_MSG_DELOBJ] = {
8591                 .call           = nf_tables_delobj,
8592                 .type           = NFNL_CB_BATCH,
8593                 .attr_count     = NFTA_OBJ_MAX,
8594                 .policy         = nft_obj_policy,
8595         },
8596         [NFT_MSG_DESTROYOBJ] = {
8597                 .call           = nf_tables_delobj,
8598                 .type           = NFNL_CB_BATCH,
8599                 .attr_count     = NFTA_OBJ_MAX,
8600                 .policy         = nft_obj_policy,
8601         },
8602         [NFT_MSG_GETOBJ_RESET] = {
8603                 .call           = nf_tables_getobj,
8604                 .type           = NFNL_CB_RCU,
8605                 .attr_count     = NFTA_OBJ_MAX,
8606                 .policy         = nft_obj_policy,
8607         },
8608         [NFT_MSG_NEWFLOWTABLE] = {
8609                 .call           = nf_tables_newflowtable,
8610                 .type           = NFNL_CB_BATCH,
8611                 .attr_count     = NFTA_FLOWTABLE_MAX,
8612                 .policy         = nft_flowtable_policy,
8613         },
8614         [NFT_MSG_GETFLOWTABLE] = {
8615                 .call           = nf_tables_getflowtable,
8616                 .type           = NFNL_CB_RCU,
8617                 .attr_count     = NFTA_FLOWTABLE_MAX,
8618                 .policy         = nft_flowtable_policy,
8619         },
8620         [NFT_MSG_DELFLOWTABLE] = {
8621                 .call           = nf_tables_delflowtable,
8622                 .type           = NFNL_CB_BATCH,
8623                 .attr_count     = NFTA_FLOWTABLE_MAX,
8624                 .policy         = nft_flowtable_policy,
8625         },
8626         [NFT_MSG_DESTROYFLOWTABLE] = {
8627                 .call           = nf_tables_delflowtable,
8628                 .type           = NFNL_CB_BATCH,
8629                 .attr_count     = NFTA_FLOWTABLE_MAX,
8630                 .policy         = nft_flowtable_policy,
8631         },
8632 };
8633
8634 static int nf_tables_validate(struct net *net)
8635 {
8636         struct nftables_pernet *nft_net = nft_pernet(net);
8637         struct nft_table *table;
8638
8639         list_for_each_entry(table, &nft_net->tables, list) {
8640                 switch (table->validate_state) {
8641                 case NFT_VALIDATE_SKIP:
8642                         continue;
8643                 case NFT_VALIDATE_NEED:
8644                         nft_validate_state_update(table, NFT_VALIDATE_DO);
8645                         fallthrough;
8646                 case NFT_VALIDATE_DO:
8647                         if (nft_table_validate(net, table) < 0)
8648                                 return -EAGAIN;
8649
8650                         nft_validate_state_update(table, NFT_VALIDATE_SKIP);
8651                 }
8652
8653                 break;
8654         }
8655
8656         return 0;
8657 }
8658
8659 /* a drop policy has to be deferred until all rules have been activated,
8660  * otherwise a large ruleset that contains a drop-policy base chain will
8661  * cause all packets to get dropped until the full transaction has been
8662  * processed.
8663  *
8664  * We defer the drop policy until the transaction has been finalized.
8665  */
8666 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8667 {
8668         struct nft_base_chain *basechain;
8669
8670         if (nft_trans_chain_policy(trans) != NF_DROP)
8671                 return;
8672
8673         if (!nft_is_base_chain(trans->ctx.chain))
8674                 return;
8675
8676         basechain = nft_base_chain(trans->ctx.chain);
8677         basechain->policy = NF_DROP;
8678 }
8679
8680 static void nft_chain_commit_update(struct nft_trans *trans)
8681 {
8682         struct nft_base_chain *basechain;
8683
8684         if (nft_trans_chain_name(trans)) {
8685                 rhltable_remove(&trans->ctx.table->chains_ht,
8686                                 &trans->ctx.chain->rhlhead,
8687                                 nft_chain_ht_params);
8688                 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8689                 rhltable_insert_key(&trans->ctx.table->chains_ht,
8690                                     trans->ctx.chain->name,
8691                                     &trans->ctx.chain->rhlhead,
8692                                     nft_chain_ht_params);
8693         }
8694
8695         if (!nft_is_base_chain(trans->ctx.chain))
8696                 return;
8697
8698         nft_chain_stats_replace(trans);
8699
8700         basechain = nft_base_chain(trans->ctx.chain);
8701
8702         switch (nft_trans_chain_policy(trans)) {
8703         case NF_DROP:
8704         case NF_ACCEPT:
8705                 basechain->policy = nft_trans_chain_policy(trans);
8706                 break;
8707         }
8708 }
8709
8710 static void nft_obj_commit_update(struct nft_trans *trans)
8711 {
8712         struct nft_object *newobj;
8713         struct nft_object *obj;
8714
8715         obj = nft_trans_obj(trans);
8716         newobj = nft_trans_obj_newobj(trans);
8717
8718         if (obj->ops->update)
8719                 obj->ops->update(obj, newobj);
8720
8721         nft_obj_destroy(&trans->ctx, newobj);
8722 }
8723
8724 static void nft_commit_release(struct nft_trans *trans)
8725 {
8726         switch (trans->msg_type) {
8727         case NFT_MSG_DELTABLE:
8728         case NFT_MSG_DESTROYTABLE:
8729                 nf_tables_table_destroy(&trans->ctx);
8730                 break;
8731         case NFT_MSG_NEWCHAIN:
8732                 free_percpu(nft_trans_chain_stats(trans));
8733                 kfree(nft_trans_chain_name(trans));
8734                 break;
8735         case NFT_MSG_DELCHAIN:
8736         case NFT_MSG_DESTROYCHAIN:
8737                 nf_tables_chain_destroy(&trans->ctx);
8738                 break;
8739         case NFT_MSG_DELRULE:
8740         case NFT_MSG_DESTROYRULE:
8741                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8742                 break;
8743         case NFT_MSG_DELSET:
8744         case NFT_MSG_DESTROYSET:
8745                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8746                 break;
8747         case NFT_MSG_DELSETELEM:
8748         case NFT_MSG_DESTROYSETELEM:
8749                 nf_tables_set_elem_destroy(&trans->ctx,
8750                                            nft_trans_elem_set(trans),
8751                                            nft_trans_elem(trans).priv);
8752                 break;
8753         case NFT_MSG_DELOBJ:
8754         case NFT_MSG_DESTROYOBJ:
8755                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8756                 break;
8757         case NFT_MSG_DELFLOWTABLE:
8758         case NFT_MSG_DESTROYFLOWTABLE:
8759                 if (nft_trans_flowtable_update(trans))
8760                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8761                 else
8762                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8763                 break;
8764         }
8765
8766         if (trans->put_net)
8767                 put_net(trans->ctx.net);
8768
8769         kfree(trans);
8770 }
8771
8772 static void nf_tables_trans_destroy_work(struct work_struct *w)
8773 {
8774         struct nft_trans *trans, *next;
8775         LIST_HEAD(head);
8776
8777         spin_lock(&nf_tables_destroy_list_lock);
8778         list_splice_init(&nf_tables_destroy_list, &head);
8779         spin_unlock(&nf_tables_destroy_list_lock);
8780
8781         if (list_empty(&head))
8782                 return;
8783
8784         synchronize_rcu();
8785
8786         list_for_each_entry_safe(trans, next, &head, list) {
8787                 list_del(&trans->list);
8788                 nft_commit_release(trans);
8789         }
8790 }
8791
8792 void nf_tables_trans_destroy_flush_work(void)
8793 {
8794         flush_work(&trans_destroy_work);
8795 }
8796 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8797
8798 static bool nft_expr_reduce(struct nft_regs_track *track,
8799                             const struct nft_expr *expr)
8800 {
8801         return false;
8802 }
8803
8804 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8805 {
8806         const struct nft_expr *expr, *last;
8807         struct nft_regs_track track = {};
8808         unsigned int size, data_size;
8809         void *data, *data_boundary;
8810         struct nft_rule_dp *prule;
8811         struct nft_rule *rule;
8812
8813         /* already handled or inactive chain? */
8814         if (chain->blob_next || !nft_is_active_next(net, chain))
8815                 return 0;
8816
8817         data_size = 0;
8818         list_for_each_entry(rule, &chain->rules, list) {
8819                 if (nft_is_active_next(net, rule)) {
8820                         data_size += sizeof(*prule) + rule->dlen;
8821                         if (data_size > INT_MAX)
8822                                 return -ENOMEM;
8823                 }
8824         }
8825
8826         chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
8827         if (!chain->blob_next)
8828                 return -ENOMEM;
8829
8830         data = (void *)chain->blob_next->data;
8831         data_boundary = data + data_size;
8832         size = 0;
8833
8834         list_for_each_entry(rule, &chain->rules, list) {
8835                 if (!nft_is_active_next(net, rule))
8836                         continue;
8837
8838                 prule = (struct nft_rule_dp *)data;
8839                 data += offsetof(struct nft_rule_dp, data);
8840                 if (WARN_ON_ONCE(data > data_boundary))
8841                         return -ENOMEM;
8842
8843                 size = 0;
8844                 track.last = nft_expr_last(rule);
8845                 nft_rule_for_each_expr(expr, last, rule) {
8846                         track.cur = expr;
8847
8848                         if (nft_expr_reduce(&track, expr)) {
8849                                 expr = track.cur;
8850                                 continue;
8851                         }
8852
8853                         if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8854                                 return -ENOMEM;
8855
8856                         memcpy(data + size, expr, expr->ops->size);
8857                         size += expr->ops->size;
8858                 }
8859                 if (WARN_ON_ONCE(size >= 1 << 12))
8860                         return -ENOMEM;
8861
8862                 prule->handle = rule->handle;
8863                 prule->dlen = size;
8864                 prule->is_last = 0;
8865
8866                 data += size;
8867                 size = 0;
8868                 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8869         }
8870
8871         if (WARN_ON_ONCE(data > data_boundary))
8872                 return -ENOMEM;
8873
8874         prule = (struct nft_rule_dp *)data;
8875         nft_last_rule(chain, prule);
8876
8877         return 0;
8878 }
8879
8880 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8881 {
8882         struct nftables_pernet *nft_net = nft_pernet(net);
8883         struct nft_trans *trans, *next;
8884
8885         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8886                 struct nft_chain *chain = trans->ctx.chain;
8887
8888                 if (trans->msg_type == NFT_MSG_NEWRULE ||
8889                     trans->msg_type == NFT_MSG_DELRULE) {
8890                         kvfree(chain->blob_next);
8891                         chain->blob_next = NULL;
8892                 }
8893         }
8894 }
8895
8896 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
8897 {
8898         struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
8899
8900         kvfree(l->blob);
8901 }
8902
8903 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8904 {
8905         struct nft_rule_dp_last *last;
8906
8907         /* last rule trailer is after end marker */
8908         last = (void *)blob + sizeof(*blob) + blob->size;
8909         last->blob = blob;
8910
8911         call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
8912 }
8913
8914 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8915 {
8916         struct nft_rule_blob *g0, *g1;
8917         bool next_genbit;
8918
8919         next_genbit = nft_gencursor_next(net);
8920
8921         g0 = rcu_dereference_protected(chain->blob_gen_0,
8922                                        lockdep_commit_lock_is_held(net));
8923         g1 = rcu_dereference_protected(chain->blob_gen_1,
8924                                        lockdep_commit_lock_is_held(net));
8925
8926         /* No changes to this chain? */
8927         if (chain->blob_next == NULL) {
8928                 /* chain had no change in last or next generation */
8929                 if (g0 == g1)
8930                         return;
8931                 /*
8932                  * chain had no change in this generation; make sure next
8933                  * one uses same rules as current generation.
8934                  */
8935                 if (next_genbit) {
8936                         rcu_assign_pointer(chain->blob_gen_1, g0);
8937                         nf_tables_commit_chain_free_rules_old(g1);
8938                 } else {
8939                         rcu_assign_pointer(chain->blob_gen_0, g1);
8940                         nf_tables_commit_chain_free_rules_old(g0);
8941                 }
8942
8943                 return;
8944         }
8945
8946         if (next_genbit)
8947                 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8948         else
8949                 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8950
8951         chain->blob_next = NULL;
8952
8953         if (g0 == g1)
8954                 return;
8955
8956         if (next_genbit)
8957                 nf_tables_commit_chain_free_rules_old(g1);
8958         else
8959                 nf_tables_commit_chain_free_rules_old(g0);
8960 }
8961
8962 static void nft_obj_del(struct nft_object *obj)
8963 {
8964         rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8965         list_del_rcu(&obj->list);
8966 }
8967
8968 void nft_chain_del(struct nft_chain *chain)
8969 {
8970         struct nft_table *table = chain->table;
8971
8972         WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8973                                      nft_chain_ht_params));
8974         list_del_rcu(&chain->list);
8975 }
8976
8977 static void nf_tables_module_autoload_cleanup(struct net *net)
8978 {
8979         struct nftables_pernet *nft_net = nft_pernet(net);
8980         struct nft_module_request *req, *next;
8981
8982         WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8983         list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8984                 WARN_ON_ONCE(!req->done);
8985                 list_del(&req->list);
8986                 kfree(req);
8987         }
8988 }
8989
8990 static void nf_tables_commit_release(struct net *net)
8991 {
8992         struct nftables_pernet *nft_net = nft_pernet(net);
8993         struct nft_trans *trans;
8994
8995         /* all side effects have to be made visible.
8996          * For example, if a chain named 'foo' has been deleted, a
8997          * new transaction must not find it anymore.
8998          *
8999          * Memory reclaim happens asynchronously from work queue
9000          * to prevent expensive synchronize_rcu() in commit phase.
9001          */
9002         if (list_empty(&nft_net->commit_list)) {
9003                 nf_tables_module_autoload_cleanup(net);
9004                 mutex_unlock(&nft_net->commit_mutex);
9005                 return;
9006         }
9007
9008         trans = list_last_entry(&nft_net->commit_list,
9009                                 struct nft_trans, list);
9010         get_net(trans->ctx.net);
9011         WARN_ON_ONCE(trans->put_net);
9012
9013         trans->put_net = true;
9014         spin_lock(&nf_tables_destroy_list_lock);
9015         list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9016         spin_unlock(&nf_tables_destroy_list_lock);
9017
9018         nf_tables_module_autoload_cleanup(net);
9019         schedule_work(&trans_destroy_work);
9020
9021         mutex_unlock(&nft_net->commit_mutex);
9022 }
9023
9024 static void nft_commit_notify(struct net *net, u32 portid)
9025 {
9026         struct nftables_pernet *nft_net = nft_pernet(net);
9027         struct sk_buff *batch_skb = NULL, *nskb, *skb;
9028         unsigned char *data;
9029         int len;
9030
9031         list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9032                 if (!batch_skb) {
9033 new_batch:
9034                         batch_skb = skb;
9035                         len = NLMSG_GOODSIZE - skb->len;
9036                         list_del(&skb->list);
9037                         continue;
9038                 }
9039                 len -= skb->len;
9040                 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9041                         data = skb_put(batch_skb, skb->len);
9042                         memcpy(data, skb->data, skb->len);
9043                         list_del(&skb->list);
9044                         kfree_skb(skb);
9045                         continue;
9046                 }
9047                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9048                                NFT_CB(batch_skb).report, GFP_KERNEL);
9049                 goto new_batch;
9050         }
9051
9052         if (batch_skb) {
9053                 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9054                                NFT_CB(batch_skb).report, GFP_KERNEL);
9055         }
9056
9057         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9058 }
9059
9060 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9061                                         struct nft_table *table)
9062 {
9063         struct nft_audit_data *adp;
9064
9065         list_for_each_entry(adp, adl, list) {
9066                 if (adp->table == table)
9067                         return 0;
9068         }
9069         adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9070         if (!adp)
9071                 return -ENOMEM;
9072         adp->table = table;
9073         list_add(&adp->list, adl);
9074         return 0;
9075 }
9076
9077 static void nf_tables_commit_audit_free(struct list_head *adl)
9078 {
9079         struct nft_audit_data *adp, *adn;
9080
9081         list_for_each_entry_safe(adp, adn, adl, list) {
9082                 list_del(&adp->list);
9083                 kfree(adp);
9084         }
9085 }
9086
9087 static void nf_tables_commit_audit_collect(struct list_head *adl,
9088                                            struct nft_table *table, u32 op)
9089 {
9090         struct nft_audit_data *adp;
9091
9092         list_for_each_entry(adp, adl, list) {
9093                 if (adp->table == table)
9094                         goto found;
9095         }
9096         WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9097         return;
9098 found:
9099         adp->entries++;
9100         if (!adp->op || adp->op > op)
9101                 adp->op = op;
9102 }
9103
9104 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9105
9106 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9107 {
9108         struct nft_audit_data *adp, *adn;
9109         char aubuf[AUNFTABLENAMELEN];
9110
9111         list_for_each_entry_safe(adp, adn, adl, list) {
9112                 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9113                          generation);
9114                 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9115                                 nft2audit_op[adp->op], GFP_KERNEL);
9116                 list_del(&adp->list);
9117                 kfree(adp);
9118         }
9119 }
9120
9121 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9122 {
9123         struct nftables_pernet *nft_net = nft_pernet(net);
9124         struct nft_trans *trans, *next;
9125         struct nft_trans_elem *te;
9126         struct nft_chain *chain;
9127         struct nft_table *table;
9128         unsigned int base_seq;
9129         LIST_HEAD(adl);
9130         int err;
9131
9132         if (list_empty(&nft_net->commit_list)) {
9133                 mutex_unlock(&nft_net->commit_mutex);
9134                 return 0;
9135         }
9136
9137         /* 0. Validate ruleset, otherwise roll back for error reporting. */
9138         if (nf_tables_validate(net) < 0)
9139                 return -EAGAIN;
9140
9141         err = nft_flow_rule_offload_commit(net);
9142         if (err < 0)
9143                 return err;
9144
9145         /* 1.  Allocate space for next generation rules_gen_X[] */
9146         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9147                 int ret;
9148
9149                 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9150                 if (ret) {
9151                         nf_tables_commit_chain_prepare_cancel(net);
9152                         nf_tables_commit_audit_free(&adl);
9153                         return ret;
9154                 }
9155                 if (trans->msg_type == NFT_MSG_NEWRULE ||
9156                     trans->msg_type == NFT_MSG_DELRULE) {
9157                         chain = trans->ctx.chain;
9158
9159                         ret = nf_tables_commit_chain_prepare(net, chain);
9160                         if (ret < 0) {
9161                                 nf_tables_commit_chain_prepare_cancel(net);
9162                                 nf_tables_commit_audit_free(&adl);
9163                                 return ret;
9164                         }
9165                 }
9166         }
9167
9168         /* step 2.  Make rules_gen_X visible to packet path */
9169         list_for_each_entry(table, &nft_net->tables, list) {
9170                 list_for_each_entry(chain, &table->chains, list)
9171                         nf_tables_commit_chain(net, chain);
9172         }
9173
9174         /*
9175          * Bump generation counter, invalidate any dump in progress.
9176          * Cannot fail after this point.
9177          */
9178         base_seq = READ_ONCE(nft_net->base_seq);
9179         while (++base_seq == 0)
9180                 ;
9181
9182         WRITE_ONCE(nft_net->base_seq, base_seq);
9183
9184         /* step 3. Start new generation, rules_gen_X now in use. */
9185         net->nft.gencursor = nft_gencursor_next(net);
9186
9187         list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9188                 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9189                                                trans->msg_type);
9190                 switch (trans->msg_type) {
9191                 case NFT_MSG_NEWTABLE:
9192                         if (nft_trans_table_update(trans)) {
9193                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9194                                         nft_trans_destroy(trans);
9195                                         break;
9196                                 }
9197                                 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9198                                         nf_tables_table_disable(net, trans->ctx.table);
9199
9200                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9201                         } else {
9202                                 nft_clear(net, trans->ctx.table);
9203                         }
9204                         nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9205                         nft_trans_destroy(trans);
9206                         break;
9207                 case NFT_MSG_DELTABLE:
9208                 case NFT_MSG_DESTROYTABLE:
9209                         list_del_rcu(&trans->ctx.table->list);
9210                         nf_tables_table_notify(&trans->ctx, trans->msg_type);
9211                         break;
9212                 case NFT_MSG_NEWCHAIN:
9213                         if (nft_trans_chain_update(trans)) {
9214                                 nft_chain_commit_update(trans);
9215                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9216                                 /* trans destroyed after rcu grace period */
9217                         } else {
9218                                 nft_chain_commit_drop_policy(trans);
9219                                 nft_clear(net, trans->ctx.chain);
9220                                 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9221                                 nft_trans_destroy(trans);
9222                         }
9223                         break;
9224                 case NFT_MSG_DELCHAIN:
9225                 case NFT_MSG_DESTROYCHAIN:
9226                         nft_chain_del(trans->ctx.chain);
9227                         nf_tables_chain_notify(&trans->ctx, trans->msg_type);
9228                         nf_tables_unregister_hook(trans->ctx.net,
9229                                                   trans->ctx.table,
9230                                                   trans->ctx.chain);
9231                         break;
9232                 case NFT_MSG_NEWRULE:
9233                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9234                         nf_tables_rule_notify(&trans->ctx,
9235                                               nft_trans_rule(trans),
9236                                               NFT_MSG_NEWRULE);
9237                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9238                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9239
9240                         nft_trans_destroy(trans);
9241                         break;
9242                 case NFT_MSG_DELRULE:
9243                 case NFT_MSG_DESTROYRULE:
9244                         list_del_rcu(&nft_trans_rule(trans)->list);
9245                         nf_tables_rule_notify(&trans->ctx,
9246                                               nft_trans_rule(trans),
9247                                               trans->msg_type);
9248                         nft_rule_expr_deactivate(&trans->ctx,
9249                                                  nft_trans_rule(trans),
9250                                                  NFT_TRANS_COMMIT);
9251
9252                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9253                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9254                         break;
9255                 case NFT_MSG_NEWSET:
9256                         if (nft_trans_set_update(trans)) {
9257                                 struct nft_set *set = nft_trans_set(trans);
9258
9259                                 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9260                                 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9261                         } else {
9262                                 nft_clear(net, nft_trans_set(trans));
9263                                 /* This avoids hitting -EBUSY when deleting the table
9264                                  * from the transaction.
9265                                  */
9266                                 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9267                                     !list_empty(&nft_trans_set(trans)->bindings))
9268                                         trans->ctx.table->use--;
9269                         }
9270                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9271                                              NFT_MSG_NEWSET, GFP_KERNEL);
9272                         nft_trans_destroy(trans);
9273                         break;
9274                 case NFT_MSG_DELSET:
9275                 case NFT_MSG_DESTROYSET:
9276                         list_del_rcu(&nft_trans_set(trans)->list);
9277                         nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9278                                              trans->msg_type, GFP_KERNEL);
9279                         break;
9280                 case NFT_MSG_NEWSETELEM:
9281                         te = (struct nft_trans_elem *)trans->data;
9282
9283                         nft_setelem_activate(net, te->set, &te->elem);
9284                         nf_tables_setelem_notify(&trans->ctx, te->set,
9285                                                  &te->elem,
9286                                                  NFT_MSG_NEWSETELEM);
9287                         nft_trans_destroy(trans);
9288                         break;
9289                 case NFT_MSG_DELSETELEM:
9290                 case NFT_MSG_DESTROYSETELEM:
9291                         te = (struct nft_trans_elem *)trans->data;
9292
9293                         nf_tables_setelem_notify(&trans->ctx, te->set,
9294                                                  &te->elem,
9295                                                  trans->msg_type);
9296                         nft_setelem_remove(net, te->set, &te->elem);
9297                         if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9298                                 atomic_dec(&te->set->nelems);
9299                                 te->set->ndeact--;
9300                         }
9301                         break;
9302                 case NFT_MSG_NEWOBJ:
9303                         if (nft_trans_obj_update(trans)) {
9304                                 nft_obj_commit_update(trans);
9305                                 nf_tables_obj_notify(&trans->ctx,
9306                                                      nft_trans_obj(trans),
9307                                                      NFT_MSG_NEWOBJ);
9308                         } else {
9309                                 nft_clear(net, nft_trans_obj(trans));
9310                                 nf_tables_obj_notify(&trans->ctx,
9311                                                      nft_trans_obj(trans),
9312                                                      NFT_MSG_NEWOBJ);
9313                                 nft_trans_destroy(trans);
9314                         }
9315                         break;
9316                 case NFT_MSG_DELOBJ:
9317                 case NFT_MSG_DESTROYOBJ:
9318                         nft_obj_del(nft_trans_obj(trans));
9319                         nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9320                                              trans->msg_type);
9321                         break;
9322                 case NFT_MSG_NEWFLOWTABLE:
9323                         if (nft_trans_flowtable_update(trans)) {
9324                                 nft_trans_flowtable(trans)->data.flags =
9325                                         nft_trans_flowtable_flags(trans);
9326                                 nf_tables_flowtable_notify(&trans->ctx,
9327                                                            nft_trans_flowtable(trans),
9328                                                            &nft_trans_flowtable_hooks(trans),
9329                                                            NFT_MSG_NEWFLOWTABLE);
9330                                 list_splice(&nft_trans_flowtable_hooks(trans),
9331                                             &nft_trans_flowtable(trans)->hook_list);
9332                         } else {
9333                                 nft_clear(net, nft_trans_flowtable(trans));
9334                                 nf_tables_flowtable_notify(&trans->ctx,
9335                                                            nft_trans_flowtable(trans),
9336                                                            &nft_trans_flowtable(trans)->hook_list,
9337                                                            NFT_MSG_NEWFLOWTABLE);
9338                         }
9339                         nft_trans_destroy(trans);
9340                         break;
9341                 case NFT_MSG_DELFLOWTABLE:
9342                 case NFT_MSG_DESTROYFLOWTABLE:
9343                         if (nft_trans_flowtable_update(trans)) {
9344                                 nf_tables_flowtable_notify(&trans->ctx,
9345                                                            nft_trans_flowtable(trans),
9346                                                            &nft_trans_flowtable_hooks(trans),
9347                                                            trans->msg_type);
9348                                 nft_unregister_flowtable_net_hooks(net,
9349                                                                    &nft_trans_flowtable_hooks(trans));
9350                         } else {
9351                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9352                                 nf_tables_flowtable_notify(&trans->ctx,
9353                                                            nft_trans_flowtable(trans),
9354                                                            &nft_trans_flowtable(trans)->hook_list,
9355                                                            trans->msg_type);
9356                                 nft_unregister_flowtable_net_hooks(net,
9357                                                 &nft_trans_flowtable(trans)->hook_list);
9358                         }
9359                         break;
9360                 }
9361         }
9362
9363         nft_commit_notify(net, NETLINK_CB(skb).portid);
9364         nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9365         nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9366         nf_tables_commit_release(net);
9367
9368         return 0;
9369 }
9370
9371 static void nf_tables_module_autoload(struct net *net)
9372 {
9373         struct nftables_pernet *nft_net = nft_pernet(net);
9374         struct nft_module_request *req, *next;
9375         LIST_HEAD(module_list);
9376
9377         list_splice_init(&nft_net->module_list, &module_list);
9378         mutex_unlock(&nft_net->commit_mutex);
9379         list_for_each_entry_safe(req, next, &module_list, list) {
9380                 request_module("%s", req->module);
9381                 req->done = true;
9382         }
9383         mutex_lock(&nft_net->commit_mutex);
9384         list_splice(&module_list, &nft_net->module_list);
9385 }
9386
9387 static void nf_tables_abort_release(struct nft_trans *trans)
9388 {
9389         switch (trans->msg_type) {
9390         case NFT_MSG_NEWTABLE:
9391                 nf_tables_table_destroy(&trans->ctx);
9392                 break;
9393         case NFT_MSG_NEWCHAIN:
9394                 nf_tables_chain_destroy(&trans->ctx);
9395                 break;
9396         case NFT_MSG_NEWRULE:
9397                 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9398                 break;
9399         case NFT_MSG_NEWSET:
9400                 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9401                 break;
9402         case NFT_MSG_NEWSETELEM:
9403                 nft_set_elem_destroy(nft_trans_elem_set(trans),
9404                                      nft_trans_elem(trans).priv, true);
9405                 break;
9406         case NFT_MSG_NEWOBJ:
9407                 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9408                 break;
9409         case NFT_MSG_NEWFLOWTABLE:
9410                 if (nft_trans_flowtable_update(trans))
9411                         nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9412                 else
9413                         nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9414                 break;
9415         }
9416         kfree(trans);
9417 }
9418
9419 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9420 {
9421         struct nftables_pernet *nft_net = nft_pernet(net);
9422         struct nft_trans *trans, *next;
9423         struct nft_trans_elem *te;
9424
9425         if (action == NFNL_ABORT_VALIDATE &&
9426             nf_tables_validate(net) < 0)
9427                 return -EAGAIN;
9428
9429         list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9430                                          list) {
9431                 switch (trans->msg_type) {
9432                 case NFT_MSG_NEWTABLE:
9433                         if (nft_trans_table_update(trans)) {
9434                                 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9435                                         nft_trans_destroy(trans);
9436                                         break;
9437                                 }
9438                                 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9439                                         nf_tables_table_disable(net, trans->ctx.table);
9440                                         trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9441                                 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9442                                         trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9443                                 }
9444                                 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9445                                 nft_trans_destroy(trans);
9446                         } else {
9447                                 list_del_rcu(&trans->ctx.table->list);
9448                         }
9449                         break;
9450                 case NFT_MSG_DELTABLE:
9451                 case NFT_MSG_DESTROYTABLE:
9452                         nft_clear(trans->ctx.net, trans->ctx.table);
9453                         nft_trans_destroy(trans);
9454                         break;
9455                 case NFT_MSG_NEWCHAIN:
9456                         if (nft_trans_chain_update(trans)) {
9457                                 free_percpu(nft_trans_chain_stats(trans));
9458                                 kfree(nft_trans_chain_name(trans));
9459                                 nft_trans_destroy(trans);
9460                         } else {
9461                                 if (nft_chain_is_bound(trans->ctx.chain)) {
9462                                         nft_trans_destroy(trans);
9463                                         break;
9464                                 }
9465                                 trans->ctx.table->use--;
9466                                 nft_chain_del(trans->ctx.chain);
9467                                 nf_tables_unregister_hook(trans->ctx.net,
9468                                                           trans->ctx.table,
9469                                                           trans->ctx.chain);
9470                         }
9471                         break;
9472                 case NFT_MSG_DELCHAIN:
9473                 case NFT_MSG_DESTROYCHAIN:
9474                         trans->ctx.table->use++;
9475                         nft_clear(trans->ctx.net, trans->ctx.chain);
9476                         nft_trans_destroy(trans);
9477                         break;
9478                 case NFT_MSG_NEWRULE:
9479                         trans->ctx.chain->use--;
9480                         list_del_rcu(&nft_trans_rule(trans)->list);
9481                         nft_rule_expr_deactivate(&trans->ctx,
9482                                                  nft_trans_rule(trans),
9483                                                  NFT_TRANS_ABORT);
9484                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9485                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9486                         break;
9487                 case NFT_MSG_DELRULE:
9488                 case NFT_MSG_DESTROYRULE:
9489                         trans->ctx.chain->use++;
9490                         nft_clear(trans->ctx.net, nft_trans_rule(trans));
9491                         nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9492                         if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9493                                 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9494
9495                         nft_trans_destroy(trans);
9496                         break;
9497                 case NFT_MSG_NEWSET:
9498                         if (nft_trans_set_update(trans)) {
9499                                 nft_trans_destroy(trans);
9500                                 break;
9501                         }
9502                         trans->ctx.table->use--;
9503                         if (nft_trans_set_bound(trans)) {
9504                                 nft_trans_destroy(trans);
9505                                 break;
9506                         }
9507                         list_del_rcu(&nft_trans_set(trans)->list);
9508                         break;
9509                 case NFT_MSG_DELSET:
9510                 case NFT_MSG_DESTROYSET:
9511                         trans->ctx.table->use++;
9512                         nft_clear(trans->ctx.net, nft_trans_set(trans));
9513                         nft_trans_destroy(trans);
9514                         break;
9515                 case NFT_MSG_NEWSETELEM:
9516                         if (nft_trans_elem_set_bound(trans)) {
9517                                 nft_trans_destroy(trans);
9518                                 break;
9519                         }
9520                         te = (struct nft_trans_elem *)trans->data;
9521                         nft_setelem_remove(net, te->set, &te->elem);
9522                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9523                                 atomic_dec(&te->set->nelems);
9524                         break;
9525                 case NFT_MSG_DELSETELEM:
9526                 case NFT_MSG_DESTROYSETELEM:
9527                         te = (struct nft_trans_elem *)trans->data;
9528
9529                         nft_setelem_data_activate(net, te->set, &te->elem);
9530                         nft_setelem_activate(net, te->set, &te->elem);
9531                         if (!nft_setelem_is_catchall(te->set, &te->elem))
9532                                 te->set->ndeact--;
9533
9534                         nft_trans_destroy(trans);
9535                         break;
9536                 case NFT_MSG_NEWOBJ:
9537                         if (nft_trans_obj_update(trans)) {
9538                                 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9539                                 nft_trans_destroy(trans);
9540                         } else {
9541                                 trans->ctx.table->use--;
9542                                 nft_obj_del(nft_trans_obj(trans));
9543                         }
9544                         break;
9545                 case NFT_MSG_DELOBJ:
9546                 case NFT_MSG_DESTROYOBJ:
9547                         trans->ctx.table->use++;
9548                         nft_clear(trans->ctx.net, nft_trans_obj(trans));
9549                         nft_trans_destroy(trans);
9550                         break;
9551                 case NFT_MSG_NEWFLOWTABLE:
9552                         if (nft_trans_flowtable_update(trans)) {
9553                                 nft_unregister_flowtable_net_hooks(net,
9554                                                 &nft_trans_flowtable_hooks(trans));
9555                         } else {
9556                                 trans->ctx.table->use--;
9557                                 list_del_rcu(&nft_trans_flowtable(trans)->list);
9558                                 nft_unregister_flowtable_net_hooks(net,
9559                                                 &nft_trans_flowtable(trans)->hook_list);
9560                         }
9561                         break;
9562                 case NFT_MSG_DELFLOWTABLE:
9563                 case NFT_MSG_DESTROYFLOWTABLE:
9564                         if (nft_trans_flowtable_update(trans)) {
9565                                 list_splice(&nft_trans_flowtable_hooks(trans),
9566                                             &nft_trans_flowtable(trans)->hook_list);
9567                         } else {
9568                                 trans->ctx.table->use++;
9569                                 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9570                         }
9571                         nft_trans_destroy(trans);
9572                         break;
9573                 }
9574         }
9575
9576         synchronize_rcu();
9577
9578         list_for_each_entry_safe_reverse(trans, next,
9579                                          &nft_net->commit_list, list) {
9580                 list_del(&trans->list);
9581                 nf_tables_abort_release(trans);
9582         }
9583
9584         if (action == NFNL_ABORT_AUTOLOAD)
9585                 nf_tables_module_autoload(net);
9586         else
9587                 nf_tables_module_autoload_cleanup(net);
9588
9589         return 0;
9590 }
9591
9592 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9593                            enum nfnl_abort_action action)
9594 {
9595         struct nftables_pernet *nft_net = nft_pernet(net);
9596         int ret = __nf_tables_abort(net, action);
9597
9598         mutex_unlock(&nft_net->commit_mutex);
9599
9600         return ret;
9601 }
9602
9603 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9604 {
9605         struct nftables_pernet *nft_net = nft_pernet(net);
9606         bool genid_ok;
9607
9608         mutex_lock(&nft_net->commit_mutex);
9609
9610         genid_ok = genid == 0 || nft_net->base_seq == genid;
9611         if (!genid_ok)
9612                 mutex_unlock(&nft_net->commit_mutex);
9613
9614         /* else, commit mutex has to be released by commit or abort function */
9615         return genid_ok;
9616 }
9617
9618 static const struct nfnetlink_subsystem nf_tables_subsys = {
9619         .name           = "nf_tables",
9620         .subsys_id      = NFNL_SUBSYS_NFTABLES,
9621         .cb_count       = NFT_MSG_MAX,
9622         .cb             = nf_tables_cb,
9623         .commit         = nf_tables_commit,
9624         .abort          = nf_tables_abort,
9625         .valid_genid    = nf_tables_valid_genid,
9626         .owner          = THIS_MODULE,
9627 };
9628
9629 int nft_chain_validate_dependency(const struct nft_chain *chain,
9630                                   enum nft_chain_types type)
9631 {
9632         const struct nft_base_chain *basechain;
9633
9634         if (nft_is_base_chain(chain)) {
9635                 basechain = nft_base_chain(chain);
9636                 if (basechain->type->type != type)
9637                         return -EOPNOTSUPP;
9638         }
9639         return 0;
9640 }
9641 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9642
9643 int nft_chain_validate_hooks(const struct nft_chain *chain,
9644                              unsigned int hook_flags)
9645 {
9646         struct nft_base_chain *basechain;
9647
9648         if (nft_is_base_chain(chain)) {
9649                 basechain = nft_base_chain(chain);
9650
9651                 if ((1 << basechain->ops.hooknum) & hook_flags)
9652                         return 0;
9653
9654                 return -EOPNOTSUPP;
9655         }
9656
9657         return 0;
9658 }
9659 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9660
9661 /*
9662  * Loop detection - walk through the ruleset beginning at the destination chain
9663  * of a new jump until either the source chain is reached (loop) or all
9664  * reachable chains have been traversed.
9665  *
9666  * The loop check is performed whenever a new jump verdict is added to an
9667  * expression or verdict map or a verdict map is bound to a new chain.
9668  */
9669
9670 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9671                                  const struct nft_chain *chain);
9672
9673 static int nft_check_loops(const struct nft_ctx *ctx,
9674                            const struct nft_set_ext *ext)
9675 {
9676         const struct nft_data *data;
9677         int ret;
9678
9679         data = nft_set_ext_data(ext);
9680         switch (data->verdict.code) {
9681         case NFT_JUMP:
9682         case NFT_GOTO:
9683                 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9684                 break;
9685         default:
9686                 ret = 0;
9687                 break;
9688         }
9689
9690         return ret;
9691 }
9692
9693 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9694                                         struct nft_set *set,
9695                                         const struct nft_set_iter *iter,
9696                                         struct nft_set_elem *elem)
9697 {
9698         const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9699
9700         if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9701             *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9702                 return 0;
9703
9704         return nft_check_loops(ctx, ext);
9705 }
9706
9707 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9708                                   struct nft_set *set)
9709 {
9710         u8 genmask = nft_genmask_next(ctx->net);
9711         struct nft_set_elem_catchall *catchall;
9712         struct nft_set_ext *ext;
9713         int ret = 0;
9714
9715         list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9716                 ext = nft_set_elem_ext(set, catchall->elem);
9717                 if (!nft_set_elem_active(ext, genmask))
9718                         continue;
9719
9720                 ret = nft_check_loops(ctx, ext);
9721                 if (ret < 0)
9722                         return ret;
9723         }
9724
9725         return ret;
9726 }
9727
9728 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9729                                  const struct nft_chain *chain)
9730 {
9731         const struct nft_rule *rule;
9732         const struct nft_expr *expr, *last;
9733         struct nft_set *set;
9734         struct nft_set_binding *binding;
9735         struct nft_set_iter iter;
9736
9737         if (ctx->chain == chain)
9738                 return -ELOOP;
9739
9740         list_for_each_entry(rule, &chain->rules, list) {
9741                 nft_rule_for_each_expr(expr, last, rule) {
9742                         struct nft_immediate_expr *priv;
9743                         const struct nft_data *data;
9744                         int err;
9745
9746                         if (strcmp(expr->ops->type->name, "immediate"))
9747                                 continue;
9748
9749                         priv = nft_expr_priv(expr);
9750                         if (priv->dreg != NFT_REG_VERDICT)
9751                                 continue;
9752
9753                         data = &priv->data;
9754                         switch (data->verdict.code) {
9755                         case NFT_JUMP:
9756                         case NFT_GOTO:
9757                                 err = nf_tables_check_loops(ctx,
9758                                                         data->verdict.chain);
9759                                 if (err < 0)
9760                                         return err;
9761                                 break;
9762                         default:
9763                                 break;
9764                         }
9765                 }
9766         }
9767
9768         list_for_each_entry(set, &ctx->table->sets, list) {
9769                 if (!nft_is_active_next(ctx->net, set))
9770                         continue;
9771                 if (!(set->flags & NFT_SET_MAP) ||
9772                     set->dtype != NFT_DATA_VERDICT)
9773                         continue;
9774
9775                 list_for_each_entry(binding, &set->bindings, list) {
9776                         if (!(binding->flags & NFT_SET_MAP) ||
9777                             binding->chain != chain)
9778                                 continue;
9779
9780                         iter.genmask    = nft_genmask_next(ctx->net);
9781                         iter.skip       = 0;
9782                         iter.count      = 0;
9783                         iter.err        = 0;
9784                         iter.fn         = nf_tables_loop_check_setelem;
9785
9786                         set->ops->walk(ctx, set, &iter);
9787                         if (!iter.err)
9788                                 iter.err = nft_set_catchall_loops(ctx, set);
9789
9790                         if (iter.err < 0)
9791                                 return iter.err;
9792                 }
9793         }
9794
9795         return 0;
9796 }
9797
9798 /**
9799  *      nft_parse_u32_check - fetch u32 attribute and check for maximum value
9800  *
9801  *      @attr: netlink attribute to fetch value from
9802  *      @max: maximum value to be stored in dest
9803  *      @dest: pointer to the variable
9804  *
9805  *      Parse, check and store a given u32 netlink attribute into variable.
9806  *      This function returns -ERANGE if the value goes over maximum value.
9807  *      Otherwise a 0 is returned and the attribute value is stored in the
9808  *      destination variable.
9809  */
9810 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9811 {
9812         u32 val;
9813
9814         val = ntohl(nla_get_be32(attr));
9815         if (val > max)
9816                 return -ERANGE;
9817
9818         *dest = val;
9819         return 0;
9820 }
9821 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9822
9823 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9824 {
9825         unsigned int reg;
9826
9827         reg = ntohl(nla_get_be32(attr));
9828         switch (reg) {
9829         case NFT_REG_VERDICT...NFT_REG_4:
9830                 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9831                 break;
9832         case NFT_REG32_00...NFT_REG32_15:
9833                 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9834                 break;
9835         default:
9836                 return -ERANGE;
9837         }
9838
9839         return 0;
9840 }
9841
9842 /**
9843  *      nft_dump_register - dump a register value to a netlink attribute
9844  *
9845  *      @skb: socket buffer
9846  *      @attr: attribute number
9847  *      @reg: register number
9848  *
9849  *      Construct a netlink attribute containing the register number. For
9850  *      compatibility reasons, register numbers being a multiple of 4 are
9851  *      translated to the corresponding 128 bit register numbers.
9852  */
9853 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9854 {
9855         if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9856                 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9857         else
9858                 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9859
9860         return nla_put_be32(skb, attr, htonl(reg));
9861 }
9862 EXPORT_SYMBOL_GPL(nft_dump_register);
9863
9864 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9865 {
9866         if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9867                 return -EINVAL;
9868         if (len == 0)
9869                 return -EINVAL;
9870         if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9871                 return -ERANGE;
9872
9873         return 0;
9874 }
9875
9876 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9877 {
9878         u32 reg;
9879         int err;
9880
9881         err = nft_parse_register(attr, &reg);
9882         if (err < 0)
9883                 return err;
9884
9885         err = nft_validate_register_load(reg, len);
9886         if (err < 0)
9887                 return err;
9888
9889         *sreg = reg;
9890         return 0;
9891 }
9892 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9893
9894 static int nft_validate_register_store(const struct nft_ctx *ctx,
9895                                        enum nft_registers reg,
9896                                        const struct nft_data *data,
9897                                        enum nft_data_types type,
9898                                        unsigned int len)
9899 {
9900         int err;
9901
9902         switch (reg) {
9903         case NFT_REG_VERDICT:
9904                 if (type != NFT_DATA_VERDICT)
9905                         return -EINVAL;
9906
9907                 if (data != NULL &&
9908                     (data->verdict.code == NFT_GOTO ||
9909                      data->verdict.code == NFT_JUMP)) {
9910                         err = nf_tables_check_loops(ctx, data->verdict.chain);
9911                         if (err < 0)
9912                                 return err;
9913                 }
9914
9915                 return 0;
9916         default:
9917                 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9918                         return -EINVAL;
9919                 if (len == 0)
9920                         return -EINVAL;
9921                 if (reg * NFT_REG32_SIZE + len >
9922                     sizeof_field(struct nft_regs, data))
9923                         return -ERANGE;
9924
9925                 if (data != NULL && type != NFT_DATA_VALUE)
9926                         return -EINVAL;
9927                 return 0;
9928         }
9929 }
9930
9931 int nft_parse_register_store(const struct nft_ctx *ctx,
9932                              const struct nlattr *attr, u8 *dreg,
9933                              const struct nft_data *data,
9934                              enum nft_data_types type, unsigned int len)
9935 {
9936         int err;
9937         u32 reg;
9938
9939         err = nft_parse_register(attr, &reg);
9940         if (err < 0)
9941                 return err;
9942
9943         err = nft_validate_register_store(ctx, reg, data, type, len);
9944         if (err < 0)
9945                 return err;
9946
9947         *dreg = reg;
9948         return 0;
9949 }
9950 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9951
9952 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9953         [NFTA_VERDICT_CODE]     = { .type = NLA_U32 },
9954         [NFTA_VERDICT_CHAIN]    = { .type = NLA_STRING,
9955                                     .len = NFT_CHAIN_MAXNAMELEN - 1 },
9956         [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9957 };
9958
9959 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9960                             struct nft_data_desc *desc, const struct nlattr *nla)
9961 {
9962         u8 genmask = nft_genmask_next(ctx->net);
9963         struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9964         struct nft_chain *chain;
9965         int err;
9966
9967         err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9968                                           nft_verdict_policy, NULL);
9969         if (err < 0)
9970                 return err;
9971
9972         if (!tb[NFTA_VERDICT_CODE])
9973                 return -EINVAL;
9974         data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9975
9976         switch (data->verdict.code) {
9977         default:
9978                 switch (data->verdict.code & NF_VERDICT_MASK) {
9979                 case NF_ACCEPT:
9980                 case NF_DROP:
9981                 case NF_QUEUE:
9982                         break;
9983                 default:
9984                         return -EINVAL;
9985                 }
9986                 fallthrough;
9987         case NFT_CONTINUE:
9988         case NFT_BREAK:
9989         case NFT_RETURN:
9990                 break;
9991         case NFT_JUMP:
9992         case NFT_GOTO:
9993                 if (tb[NFTA_VERDICT_CHAIN]) {
9994                         chain = nft_chain_lookup(ctx->net, ctx->table,
9995                                                  tb[NFTA_VERDICT_CHAIN],
9996                                                  genmask);
9997                 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9998                         chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9999                                                       tb[NFTA_VERDICT_CHAIN_ID]);
10000                         if (IS_ERR(chain))
10001                                 return PTR_ERR(chain);
10002                 } else {
10003                         return -EINVAL;
10004                 }
10005
10006                 if (IS_ERR(chain))
10007                         return PTR_ERR(chain);
10008                 if (nft_is_base_chain(chain))
10009                         return -EOPNOTSUPP;
10010                 if (nft_chain_is_bound(chain))
10011                         return -EINVAL;
10012                 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10013                     chain->flags & NFT_CHAIN_BINDING)
10014                         return -EINVAL;
10015
10016                 chain->use++;
10017                 data->verdict.chain = chain;
10018                 break;
10019         }
10020
10021         desc->len = sizeof(data->verdict);
10022
10023         return 0;
10024 }
10025
10026 static void nft_verdict_uninit(const struct nft_data *data)
10027 {
10028         struct nft_chain *chain;
10029         struct nft_rule *rule;
10030
10031         switch (data->verdict.code) {
10032         case NFT_JUMP:
10033         case NFT_GOTO:
10034                 chain = data->verdict.chain;
10035                 chain->use--;
10036
10037                 if (!nft_chain_is_bound(chain))
10038                         break;
10039
10040                 chain->table->use--;
10041                 list_for_each_entry(rule, &chain->rules, list)
10042                         chain->use--;
10043
10044                 nft_chain_del(chain);
10045                 break;
10046         }
10047 }
10048
10049 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10050 {
10051         struct nlattr *nest;
10052
10053         nest = nla_nest_start_noflag(skb, type);
10054         if (!nest)
10055                 goto nla_put_failure;
10056
10057         if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10058                 goto nla_put_failure;
10059
10060         switch (v->code) {
10061         case NFT_JUMP:
10062         case NFT_GOTO:
10063                 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10064                                    v->chain->name))
10065                         goto nla_put_failure;
10066         }
10067         nla_nest_end(skb, nest);
10068         return 0;
10069
10070 nla_put_failure:
10071         return -1;
10072 }
10073
10074 static int nft_value_init(const struct nft_ctx *ctx,
10075                           struct nft_data *data, struct nft_data_desc *desc,
10076                           const struct nlattr *nla)
10077 {
10078         unsigned int len;
10079
10080         len = nla_len(nla);
10081         if (len == 0)
10082                 return -EINVAL;
10083         if (len > desc->size)
10084                 return -EOVERFLOW;
10085         if (desc->len) {
10086                 if (len != desc->len)
10087                         return -EINVAL;
10088         } else {
10089                 desc->len = len;
10090         }
10091
10092         nla_memcpy(data->data, nla, len);
10093
10094         return 0;
10095 }
10096
10097 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10098                           unsigned int len)
10099 {
10100         return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10101 }
10102
10103 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10104         [NFTA_DATA_VALUE]       = { .type = NLA_BINARY },
10105         [NFTA_DATA_VERDICT]     = { .type = NLA_NESTED },
10106 };
10107
10108 /**
10109  *      nft_data_init - parse nf_tables data netlink attributes
10110  *
10111  *      @ctx: context of the expression using the data
10112  *      @data: destination struct nft_data
10113  *      @desc: data description
10114  *      @nla: netlink attribute containing data
10115  *
10116  *      Parse the netlink data attributes and initialize a struct nft_data.
10117  *      The type and length of data are returned in the data description.
10118  *
10119  *      The caller can indicate that it only wants to accept data of type
10120  *      NFT_DATA_VALUE by passing NULL for the ctx argument.
10121  */
10122 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10123                   struct nft_data_desc *desc, const struct nlattr *nla)
10124 {
10125         struct nlattr *tb[NFTA_DATA_MAX + 1];
10126         int err;
10127
10128         if (WARN_ON_ONCE(!desc->size))
10129                 return -EINVAL;
10130
10131         err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10132                                           nft_data_policy, NULL);
10133         if (err < 0)
10134                 return err;
10135
10136         if (tb[NFTA_DATA_VALUE]) {
10137                 if (desc->type != NFT_DATA_VALUE)
10138                         return -EINVAL;
10139
10140                 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10141         } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10142                 if (desc->type != NFT_DATA_VERDICT)
10143                         return -EINVAL;
10144
10145                 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10146         } else {
10147                 err = -EINVAL;
10148         }
10149
10150         return err;
10151 }
10152 EXPORT_SYMBOL_GPL(nft_data_init);
10153
10154 /**
10155  *      nft_data_release - release a nft_data item
10156  *
10157  *      @data: struct nft_data to release
10158  *      @type: type of data
10159  *
10160  *      Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10161  *      all others need to be released by calling this function.
10162  */
10163 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10164 {
10165         if (type < NFT_DATA_VERDICT)
10166                 return;
10167         switch (type) {
10168         case NFT_DATA_VERDICT:
10169                 return nft_verdict_uninit(data);
10170         default:
10171                 WARN_ON(1);
10172         }
10173 }
10174 EXPORT_SYMBOL_GPL(nft_data_release);
10175
10176 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10177                   enum nft_data_types type, unsigned int len)
10178 {
10179         struct nlattr *nest;
10180         int err;
10181
10182         nest = nla_nest_start_noflag(skb, attr);
10183         if (nest == NULL)
10184                 return -1;
10185
10186         switch (type) {
10187         case NFT_DATA_VALUE:
10188                 err = nft_value_dump(skb, data, len);
10189                 break;
10190         case NFT_DATA_VERDICT:
10191                 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10192                 break;
10193         default:
10194                 err = -EINVAL;
10195                 WARN_ON(1);
10196         }
10197
10198         nla_nest_end(skb, nest);
10199         return err;
10200 }
10201 EXPORT_SYMBOL_GPL(nft_data_dump);
10202
10203 int __nft_release_basechain(struct nft_ctx *ctx)
10204 {
10205         struct nft_rule *rule, *nr;
10206
10207         if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10208                 return 0;
10209
10210         nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10211         list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10212                 list_del(&rule->list);
10213                 ctx->chain->use--;
10214                 nf_tables_rule_release(ctx, rule);
10215         }
10216         nft_chain_del(ctx->chain);
10217         ctx->table->use--;
10218         nf_tables_chain_destroy(ctx);
10219
10220         return 0;
10221 }
10222 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10223
10224 static void __nft_release_hook(struct net *net, struct nft_table *table)
10225 {
10226         struct nft_flowtable *flowtable;
10227         struct nft_chain *chain;
10228
10229         list_for_each_entry(chain, &table->chains, list)
10230                 __nf_tables_unregister_hook(net, table, chain, true);
10231         list_for_each_entry(flowtable, &table->flowtables, list)
10232                 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10233                                                      true);
10234 }
10235
10236 static void __nft_release_hooks(struct net *net)
10237 {
10238         struct nftables_pernet *nft_net = nft_pernet(net);
10239         struct nft_table *table;
10240
10241         list_for_each_entry(table, &nft_net->tables, list) {
10242                 if (nft_table_has_owner(table))
10243                         continue;
10244
10245                 __nft_release_hook(net, table);
10246         }
10247 }
10248
10249 static void __nft_release_table(struct net *net, struct nft_table *table)
10250 {
10251         struct nft_flowtable *flowtable, *nf;
10252         struct nft_chain *chain, *nc;
10253         struct nft_object *obj, *ne;
10254         struct nft_rule *rule, *nr;
10255         struct nft_set *set, *ns;
10256         struct nft_ctx ctx = {
10257                 .net    = net,
10258                 .family = NFPROTO_NETDEV,
10259         };
10260
10261         ctx.family = table->family;
10262         ctx.table = table;
10263         list_for_each_entry(chain, &table->chains, list) {
10264                 ctx.chain = chain;
10265                 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10266                         list_del(&rule->list);
10267                         chain->use--;
10268                         nf_tables_rule_release(&ctx, rule);
10269                 }
10270         }
10271         list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10272                 list_del(&flowtable->list);
10273                 table->use--;
10274                 nf_tables_flowtable_destroy(flowtable);
10275         }
10276         list_for_each_entry_safe(set, ns, &table->sets, list) {
10277                 list_del(&set->list);
10278                 table->use--;
10279                 nft_set_destroy(&ctx, set);
10280         }
10281         list_for_each_entry_safe(obj, ne, &table->objects, list) {
10282                 nft_obj_del(obj);
10283                 table->use--;
10284                 nft_obj_destroy(&ctx, obj);
10285         }
10286         list_for_each_entry_safe(chain, nc, &table->chains, list) {
10287                 ctx.chain = chain;
10288                 nft_chain_del(chain);
10289                 table->use--;
10290                 nf_tables_chain_destroy(&ctx);
10291         }
10292         nf_tables_table_destroy(&ctx);
10293 }
10294
10295 static void __nft_release_tables(struct net *net)
10296 {
10297         struct nftables_pernet *nft_net = nft_pernet(net);
10298         struct nft_table *table, *nt;
10299
10300         list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10301                 if (nft_table_has_owner(table))
10302                         continue;
10303
10304                 list_del(&table->list);
10305
10306                 __nft_release_table(net, table);
10307         }
10308 }
10309
10310 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10311                             void *ptr)
10312 {
10313         struct nft_table *table, *to_delete[8];
10314         struct nftables_pernet *nft_net;
10315         struct netlink_notify *n = ptr;
10316         struct net *net = n->net;
10317         unsigned int deleted;
10318         bool restart = false;
10319
10320         if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10321                 return NOTIFY_DONE;
10322
10323         nft_net = nft_pernet(net);
10324         deleted = 0;
10325         mutex_lock(&nft_net->commit_mutex);
10326         if (!list_empty(&nf_tables_destroy_list))
10327                 rcu_barrier();
10328 again:
10329         list_for_each_entry(table, &nft_net->tables, list) {
10330                 if (nft_table_has_owner(table) &&
10331                     n->portid == table->nlpid) {
10332                         __nft_release_hook(net, table);
10333                         list_del_rcu(&table->list);
10334                         to_delete[deleted++] = table;
10335                         if (deleted >= ARRAY_SIZE(to_delete))
10336                                 break;
10337                 }
10338         }
10339         if (deleted) {
10340                 restart = deleted >= ARRAY_SIZE(to_delete);
10341                 synchronize_rcu();
10342                 while (deleted)
10343                         __nft_release_table(net, to_delete[--deleted]);
10344
10345                 if (restart)
10346                         goto again;
10347         }
10348         mutex_unlock(&nft_net->commit_mutex);
10349
10350         return NOTIFY_DONE;
10351 }
10352
10353 static struct notifier_block nft_nl_notifier = {
10354         .notifier_call  = nft_rcv_nl_event,
10355 };
10356
10357 static int __net_init nf_tables_init_net(struct net *net)
10358 {
10359         struct nftables_pernet *nft_net = nft_pernet(net);
10360
10361         INIT_LIST_HEAD(&nft_net->tables);
10362         INIT_LIST_HEAD(&nft_net->commit_list);
10363         INIT_LIST_HEAD(&nft_net->module_list);
10364         INIT_LIST_HEAD(&nft_net->notify_list);
10365         mutex_init(&nft_net->commit_mutex);
10366         nft_net->base_seq = 1;
10367
10368         return 0;
10369 }
10370
10371 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10372 {
10373         struct nftables_pernet *nft_net = nft_pernet(net);
10374
10375         mutex_lock(&nft_net->commit_mutex);
10376         __nft_release_hooks(net);
10377         mutex_unlock(&nft_net->commit_mutex);
10378 }
10379
10380 static void __net_exit nf_tables_exit_net(struct net *net)
10381 {
10382         struct nftables_pernet *nft_net = nft_pernet(net);
10383
10384         mutex_lock(&nft_net->commit_mutex);
10385         if (!list_empty(&nft_net->commit_list) ||
10386             !list_empty(&nft_net->module_list))
10387                 __nf_tables_abort(net, NFNL_ABORT_NONE);
10388         __nft_release_tables(net);
10389         mutex_unlock(&nft_net->commit_mutex);
10390         WARN_ON_ONCE(!list_empty(&nft_net->tables));
10391         WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10392         WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10393 }
10394
10395 static struct pernet_operations nf_tables_net_ops = {
10396         .init           = nf_tables_init_net,
10397         .pre_exit       = nf_tables_pre_exit_net,
10398         .exit           = nf_tables_exit_net,
10399         .id             = &nf_tables_net_id,
10400         .size           = sizeof(struct nftables_pernet),
10401 };
10402
10403 static int __init nf_tables_module_init(void)
10404 {
10405         int err;
10406
10407         err = register_pernet_subsys(&nf_tables_net_ops);
10408         if (err < 0)
10409                 return err;
10410
10411         err = nft_chain_filter_init();
10412         if (err < 0)
10413                 goto err_chain_filter;
10414
10415         err = nf_tables_core_module_init();
10416         if (err < 0)
10417                 goto err_core_module;
10418
10419         err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10420         if (err < 0)
10421                 goto err_netdev_notifier;
10422
10423         err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10424         if (err < 0)
10425                 goto err_rht_objname;
10426
10427         err = nft_offload_init();
10428         if (err < 0)
10429                 goto err_offload;
10430
10431         err = netlink_register_notifier(&nft_nl_notifier);
10432         if (err < 0)
10433                 goto err_netlink_notifier;
10434
10435         /* must be last */
10436         err = nfnetlink_subsys_register(&nf_tables_subsys);
10437         if (err < 0)
10438                 goto err_nfnl_subsys;
10439
10440         nft_chain_route_init();
10441
10442         return err;
10443
10444 err_nfnl_subsys:
10445         netlink_unregister_notifier(&nft_nl_notifier);
10446 err_netlink_notifier:
10447         nft_offload_exit();
10448 err_offload:
10449         rhltable_destroy(&nft_objname_ht);
10450 err_rht_objname:
10451         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10452 err_netdev_notifier:
10453         nf_tables_core_module_exit();
10454 err_core_module:
10455         nft_chain_filter_fini();
10456 err_chain_filter:
10457         unregister_pernet_subsys(&nf_tables_net_ops);
10458         return err;
10459 }
10460
10461 static void __exit nf_tables_module_exit(void)
10462 {
10463         nfnetlink_subsys_unregister(&nf_tables_subsys);
10464         netlink_unregister_notifier(&nft_nl_notifier);
10465         nft_offload_exit();
10466         unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10467         nft_chain_filter_fini();
10468         nft_chain_route_fini();
10469         unregister_pernet_subsys(&nf_tables_net_ops);
10470         cancel_work_sync(&trans_destroy_work);
10471         rcu_barrier();
10472         rhltable_destroy(&nft_objname_ht);
10473         nf_tables_core_module_exit();
10474 }
10475
10476 module_init(nf_tables_module_init);
10477 module_exit(nf_tables_module_exit);
10478
10479 MODULE_LICENSE("GPL");
10480 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10481 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);