1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> 4 * 5 * Development of this code funded by Astaro AG (http://www.astaro.com/) 6 */ 7 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/list.h> 11 #include <linux/skbuff.h> 12 #include <linux/netlink.h> 13 #include <linux/vmalloc.h> 14 #include <linux/rhashtable.h> 15 #include <linux/audit.h> 16 #include <linux/netfilter.h> 17 #include <linux/netfilter/nfnetlink.h> 18 #include <linux/netfilter/nf_tables.h> 19 #include <net/netfilter/nf_flow_table.h> 20 #include <net/netfilter/nf_tables_core.h> 21 #include <net/netfilter/nf_tables.h> 22 #include <net/netfilter/nf_tables_offload.h> 23 #include <net/net_namespace.h> 24 #include <net/sock.h> 25 26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-")) 27 28 unsigned int nf_tables_net_id __read_mostly; 29 30 static LIST_HEAD(nf_tables_expressions); 31 static LIST_HEAD(nf_tables_objects); 32 static LIST_HEAD(nf_tables_flowtables); 33 static LIST_HEAD(nf_tables_destroy_list); 34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock); 35 static u64 table_handle; 36 37 enum { 38 NFT_VALIDATE_SKIP = 0, 39 NFT_VALIDATE_NEED, 40 NFT_VALIDATE_DO, 41 }; 42 43 static struct rhltable nft_objname_ht; 44 45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed); 46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed); 47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *); 48 49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed); 50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed); 51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *); 52 53 static const struct rhashtable_params nft_chain_ht_params = { 54 .head_offset = offsetof(struct nft_chain, rhlhead), 55 .key_offset = offsetof(struct nft_chain, name), 56 .hashfn = nft_chain_hash, 57 .obj_hashfn = nft_chain_hash_obj, 58 .obj_cmpfn = nft_chain_hash_cmp, 59 .automatic_shrinking = true, 60 }; 61 62 static const struct rhashtable_params nft_objname_ht_params = { 63 .head_offset = offsetof(struct nft_object, rhlhead), 64 .key_offset = offsetof(struct nft_object, key), 65 .hashfn = nft_objname_hash, 66 .obj_hashfn = nft_objname_hash_obj, 67 .obj_cmpfn = nft_objname_hash_cmp, 68 .automatic_shrinking = true, 69 }; 70 71 struct nft_audit_data { 72 struct nft_table *table; 73 int entries; 74 int op; 75 struct list_head list; 76 }; 77 78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types 79 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER, 80 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID, 81 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER, 82 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER, 83 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID, 84 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER, 85 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER, 86 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID, 87 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER, 88 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER, 89 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID, 90 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER, 91 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER, 92 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID, 93 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER, 94 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER, 95 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID, 96 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID, 97 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER, 98 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID, 99 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER, 100 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET, 101 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER, 102 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID, 103 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, 104 }; 105 106 static void nft_validate_state_update(struct net *net, u8 new_validate_state) 107 { 108 struct nftables_pernet *nft_net = nft_pernet(net); 109 110 switch (nft_net->validate_state) { 111 case NFT_VALIDATE_SKIP: 112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO); 113 break; 114 case NFT_VALIDATE_NEED: 115 break; 116 case NFT_VALIDATE_DO: 117 if (new_validate_state == NFT_VALIDATE_NEED) 118 return; 119 } 120 121 nft_net->validate_state = new_validate_state; 122 } 123 static void nf_tables_trans_destroy_work(struct work_struct *w); 124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work); 125 126 static void nft_ctx_init(struct nft_ctx *ctx, 127 struct net *net, 128 const struct sk_buff *skb, 129 const struct nlmsghdr *nlh, 130 u8 family, 131 struct nft_table *table, 132 struct nft_chain *chain, 133 const struct nlattr * const *nla) 134 { 135 ctx->net = net; 136 ctx->family = family; 137 ctx->level = 0; 138 ctx->table = table; 139 ctx->chain = chain; 140 ctx->nla = nla; 141 ctx->portid = NETLINK_CB(skb).portid; 142 ctx->report = nlmsg_report(nlh); 143 ctx->flags = nlh->nlmsg_flags; 144 ctx->seq = nlh->nlmsg_seq; 145 } 146 147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, 148 int msg_type, u32 size, gfp_t gfp) 149 { 150 struct nft_trans *trans; 151 152 trans = kzalloc(sizeof(struct nft_trans) + size, gfp); 153 if (trans == NULL) 154 return NULL; 155 156 trans->msg_type = msg_type; 157 trans->ctx = *ctx; 158 159 return trans; 160 } 161 162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx, 163 int msg_type, u32 size) 164 { 165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL); 166 } 167 168 static void nft_trans_destroy(struct nft_trans *trans) 169 { 170 list_del(&trans->list); 171 kfree(trans); 172 } 173 174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set) 175 { 176 struct nftables_pernet *nft_net; 177 struct net *net = ctx->net; 178 struct nft_trans *trans; 179 180 if (!nft_set_is_anonymous(set)) 181 return; 182 183 nft_net = nft_pernet(net); 184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) { 185 switch (trans->msg_type) { 186 case NFT_MSG_NEWSET: 187 if (nft_trans_set(trans) == set) 188 nft_trans_set_bound(trans) = true; 189 break; 190 case NFT_MSG_NEWSETELEM: 191 if (nft_trans_elem_set(trans) == set) 192 nft_trans_elem_set_bound(trans) = true; 193 break; 194 } 195 } 196 } 197 198 static int nft_netdev_register_hooks(struct net *net, 199 struct list_head *hook_list) 200 { 201 struct nft_hook *hook; 202 int err, j; 203 204 j = 0; 205 list_for_each_entry(hook, hook_list, list) { 206 err = nf_register_net_hook(net, &hook->ops); 207 if (err < 0) 208 goto err_register; 209 210 j++; 211 } 212 return 0; 213 214 err_register: 215 list_for_each_entry(hook, hook_list, list) { 216 if (j-- <= 0) 217 break; 218 219 nf_unregister_net_hook(net, &hook->ops); 220 } 221 return err; 222 } 223 224 static void nft_netdev_unregister_hooks(struct net *net, 225 struct list_head *hook_list) 226 { 227 struct nft_hook *hook; 228 229 list_for_each_entry(hook, hook_list, list) 230 nf_unregister_net_hook(net, &hook->ops); 231 } 232 233 static int nf_tables_register_hook(struct net *net, 234 const struct nft_table *table, 235 struct nft_chain *chain) 236 { 237 struct nft_base_chain *basechain; 238 const struct nf_hook_ops *ops; 239 240 if (table->flags & NFT_TABLE_F_DORMANT || 241 !nft_is_base_chain(chain)) 242 return 0; 243 244 basechain = nft_base_chain(chain); 245 ops = &basechain->ops; 246 247 if (basechain->type->ops_register) 248 return basechain->type->ops_register(net, ops); 249 250 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) 251 return nft_netdev_register_hooks(net, &basechain->hook_list); 252 253 return nf_register_net_hook(net, &basechain->ops); 254 } 255 256 static void nf_tables_unregister_hook(struct net *net, 257 const struct nft_table *table, 258 struct nft_chain *chain) 259 { 260 struct nft_base_chain *basechain; 261 const struct nf_hook_ops *ops; 262 263 if (table->flags & NFT_TABLE_F_DORMANT || 264 !nft_is_base_chain(chain)) 265 return; 266 basechain = nft_base_chain(chain); 267 ops = &basechain->ops; 268 269 if (basechain->type->ops_unregister) 270 return basechain->type->ops_unregister(net, ops); 271 272 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) 273 nft_netdev_unregister_hooks(net, &basechain->hook_list); 274 else 275 nf_unregister_net_hook(net, &basechain->ops); 276 } 277 278 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans) 279 { 280 struct nftables_pernet *nft_net = nft_pernet(net); 281 282 list_add_tail(&trans->list, &nft_net->commit_list); 283 } 284 285 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) 286 { 287 struct nft_trans *trans; 288 289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); 290 if (trans == NULL) 291 return -ENOMEM; 292 293 if (msg_type == NFT_MSG_NEWTABLE) 294 nft_activate_next(ctx->net, ctx->table); 295 296 nft_trans_commit_list_add_tail(ctx->net, trans); 297 return 0; 298 } 299 300 static int nft_deltable(struct nft_ctx *ctx) 301 { 302 int err; 303 304 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); 305 if (err < 0) 306 return err; 307 308 nft_deactivate_next(ctx->net, ctx->table); 309 return err; 310 } 311 312 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) 313 { 314 struct nft_trans *trans; 315 316 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); 317 if (trans == NULL) 318 return ERR_PTR(-ENOMEM); 319 320 if (msg_type == NFT_MSG_NEWCHAIN) { 321 nft_activate_next(ctx->net, ctx->chain); 322 323 if (ctx->nla[NFTA_CHAIN_ID]) { 324 nft_trans_chain_id(trans) = 325 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID])); 326 } 327 } 328 329 nft_trans_commit_list_add_tail(ctx->net, trans); 330 return trans; 331 } 332 333 static int nft_delchain(struct nft_ctx *ctx) 334 { 335 struct nft_trans *trans; 336 337 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); 338 if (IS_ERR(trans)) 339 return PTR_ERR(trans); 340 341 ctx->table->use--; 342 nft_deactivate_next(ctx->net, ctx->chain); 343 344 return 0; 345 } 346 347 static void nft_rule_expr_activate(const struct nft_ctx *ctx, 348 struct nft_rule *rule) 349 { 350 struct nft_expr *expr; 351 352 expr = nft_expr_first(rule); 353 while (nft_expr_more(rule, expr)) { 354 if (expr->ops->activate) 355 expr->ops->activate(ctx, expr); 356 357 expr = nft_expr_next(expr); 358 } 359 } 360 361 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx, 362 struct nft_rule *rule, 363 enum nft_trans_phase phase) 364 { 365 struct nft_expr *expr; 366 367 expr = nft_expr_first(rule); 368 while (nft_expr_more(rule, expr)) { 369 if (expr->ops->deactivate) 370 expr->ops->deactivate(ctx, expr, phase); 371 372 expr = nft_expr_next(expr); 373 } 374 } 375 376 static int 377 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) 378 { 379 /* You cannot delete the same rule twice */ 380 if (nft_is_active_next(ctx->net, rule)) { 381 nft_deactivate_next(ctx->net, rule); 382 ctx->chain->use--; 383 return 0; 384 } 385 return -ENOENT; 386 } 387 388 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, 389 struct nft_rule *rule) 390 { 391 struct nft_trans *trans; 392 393 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); 394 if (trans == NULL) 395 return NULL; 396 397 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { 398 nft_trans_rule_id(trans) = 399 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); 400 } 401 nft_trans_rule(trans) = rule; 402 nft_trans_commit_list_add_tail(ctx->net, trans); 403 404 return trans; 405 } 406 407 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) 408 { 409 struct nft_flow_rule *flow; 410 struct nft_trans *trans; 411 int err; 412 413 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); 414 if (trans == NULL) 415 return -ENOMEM; 416 417 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) { 418 flow = nft_flow_rule_create(ctx->net, rule); 419 if (IS_ERR(flow)) { 420 nft_trans_destroy(trans); 421 return PTR_ERR(flow); 422 } 423 424 nft_trans_flow_rule(trans) = flow; 425 } 426 427 err = nf_tables_delrule_deactivate(ctx, rule); 428 if (err < 0) { 429 nft_trans_destroy(trans); 430 return err; 431 } 432 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE); 433 434 return 0; 435 } 436 437 static int nft_delrule_by_chain(struct nft_ctx *ctx) 438 { 439 struct nft_rule *rule; 440 int err; 441 442 list_for_each_entry(rule, &ctx->chain->rules, list) { 443 if (!nft_is_active_next(ctx->net, rule)) 444 continue; 445 446 err = nft_delrule(ctx, rule); 447 if (err < 0) 448 return err; 449 } 450 return 0; 451 } 452 453 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type, 454 struct nft_set *set) 455 { 456 struct nft_trans *trans; 457 458 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); 459 if (trans == NULL) 460 return -ENOMEM; 461 462 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { 463 nft_trans_set_id(trans) = 464 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); 465 nft_activate_next(ctx->net, set); 466 } 467 nft_trans_set(trans) = set; 468 nft_trans_commit_list_add_tail(ctx->net, trans); 469 470 return 0; 471 } 472 473 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set) 474 { 475 int err; 476 477 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); 478 if (err < 0) 479 return err; 480 481 nft_deactivate_next(ctx->net, set); 482 ctx->table->use--; 483 484 return err; 485 } 486 487 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, 488 struct nft_object *obj) 489 { 490 struct nft_trans *trans; 491 492 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); 493 if (trans == NULL) 494 return -ENOMEM; 495 496 if (msg_type == NFT_MSG_NEWOBJ) 497 nft_activate_next(ctx->net, obj); 498 499 nft_trans_obj(trans) = obj; 500 nft_trans_commit_list_add_tail(ctx->net, trans); 501 502 return 0; 503 } 504 505 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) 506 { 507 int err; 508 509 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); 510 if (err < 0) 511 return err; 512 513 nft_deactivate_next(ctx->net, obj); 514 ctx->table->use--; 515 516 return err; 517 } 518 519 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type, 520 struct nft_flowtable *flowtable) 521 { 522 struct nft_trans *trans; 523 524 trans = nft_trans_alloc(ctx, msg_type, 525 sizeof(struct nft_trans_flowtable)); 526 if (trans == NULL) 527 return -ENOMEM; 528 529 if (msg_type == NFT_MSG_NEWFLOWTABLE) 530 nft_activate_next(ctx->net, flowtable); 531 532 nft_trans_flowtable(trans) = flowtable; 533 nft_trans_commit_list_add_tail(ctx->net, trans); 534 535 return 0; 536 } 537 538 static int nft_delflowtable(struct nft_ctx *ctx, 539 struct nft_flowtable *flowtable) 540 { 541 int err; 542 543 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable); 544 if (err < 0) 545 return err; 546 547 nft_deactivate_next(ctx->net, flowtable); 548 ctx->table->use--; 549 550 return err; 551 } 552 553 /* 554 * Tables 555 */ 556 557 static struct nft_table *nft_table_lookup(const struct net *net, 558 const struct nlattr *nla, 559 u8 family, u8 genmask, u32 nlpid) 560 { 561 struct nftables_pernet *nft_net; 562 struct nft_table *table; 563 564 if (nla == NULL) 565 return ERR_PTR(-EINVAL); 566 567 nft_net = nft_pernet(net); 568 list_for_each_entry_rcu(table, &nft_net->tables, list, 569 lockdep_is_held(&nft_net->commit_mutex)) { 570 if (!nla_strcmp(nla, table->name) && 571 table->family == family && 572 nft_active_genmask(table, genmask)) { 573 if (nft_table_has_owner(table) && 574 nlpid && table->nlpid != nlpid) 575 return ERR_PTR(-EPERM); 576 577 return table; 578 } 579 } 580 581 return ERR_PTR(-ENOENT); 582 } 583 584 static struct nft_table *nft_table_lookup_byhandle(const struct net *net, 585 const struct nlattr *nla, 586 u8 genmask, u32 nlpid) 587 { 588 struct nftables_pernet *nft_net; 589 struct nft_table *table; 590 591 nft_net = nft_pernet(net); 592 list_for_each_entry(table, &nft_net->tables, list) { 593 if (be64_to_cpu(nla_get_be64(nla)) == table->handle && 594 nft_active_genmask(table, genmask)) { 595 if (nft_table_has_owner(table) && 596 nlpid && table->nlpid != nlpid) 597 return ERR_PTR(-EPERM); 598 599 return table; 600 } 601 } 602 603 return ERR_PTR(-ENOENT); 604 } 605 606 static inline u64 nf_tables_alloc_handle(struct nft_table *table) 607 { 608 return ++table->hgenerator; 609 } 610 611 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; 612 613 static const struct nft_chain_type * 614 __nft_chain_type_get(u8 family, enum nft_chain_types type) 615 { 616 if (family >= NFPROTO_NUMPROTO || 617 type >= NFT_CHAIN_T_MAX) 618 return NULL; 619 620 return chain_type[family][type]; 621 } 622 623 static const struct nft_chain_type * 624 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family) 625 { 626 const struct nft_chain_type *type; 627 int i; 628 629 for (i = 0; i < NFT_CHAIN_T_MAX; i++) { 630 type = __nft_chain_type_get(family, i); 631 if (!type) 632 continue; 633 if (!nla_strcmp(nla, type->name)) 634 return type; 635 } 636 return NULL; 637 } 638 639 struct nft_module_request { 640 struct list_head list; 641 char module[MODULE_NAME_LEN]; 642 bool done; 643 }; 644 645 #ifdef CONFIG_MODULES 646 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, 647 ...) 648 { 649 char module_name[MODULE_NAME_LEN]; 650 struct nftables_pernet *nft_net; 651 struct nft_module_request *req; 652 va_list args; 653 int ret; 654 655 va_start(args, fmt); 656 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args); 657 va_end(args); 658 if (ret >= MODULE_NAME_LEN) 659 return 0; 660 661 nft_net = nft_pernet(net); 662 list_for_each_entry(req, &nft_net->module_list, list) { 663 if (!strcmp(req->module, module_name)) { 664 if (req->done) 665 return 0; 666 667 /* A request to load this module already exists. */ 668 return -EAGAIN; 669 } 670 } 671 672 req = kmalloc(sizeof(*req), GFP_KERNEL); 673 if (!req) 674 return -ENOMEM; 675 676 req->done = false; 677 strlcpy(req->module, module_name, MODULE_NAME_LEN); 678 list_add_tail(&req->list, &nft_net->module_list); 679 680 return -EAGAIN; 681 } 682 EXPORT_SYMBOL_GPL(nft_request_module); 683 #endif 684 685 static void lockdep_nfnl_nft_mutex_not_held(void) 686 { 687 #ifdef CONFIG_PROVE_LOCKING 688 if (debug_locks) 689 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES)); 690 #endif 691 } 692 693 static const struct nft_chain_type * 694 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla, 695 u8 family, bool autoload) 696 { 697 const struct nft_chain_type *type; 698 699 type = __nf_tables_chain_type_lookup(nla, family); 700 if (type != NULL) 701 return type; 702 703 lockdep_nfnl_nft_mutex_not_held(); 704 #ifdef CONFIG_MODULES 705 if (autoload) { 706 if (nft_request_module(net, "nft-chain-%u-%.*s", family, 707 nla_len(nla), 708 (const char *)nla_data(nla)) == -EAGAIN) 709 return ERR_PTR(-EAGAIN); 710 } 711 #endif 712 return ERR_PTR(-ENOENT); 713 } 714 715 static __be16 nft_base_seq(const struct net *net) 716 { 717 struct nftables_pernet *nft_net = nft_pernet(net); 718 719 return htons(nft_net->base_seq & 0xffff); 720 } 721 722 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { 723 [NFTA_TABLE_NAME] = { .type = NLA_STRING, 724 .len = NFT_TABLE_MAXNAMELEN - 1 }, 725 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, 726 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 }, 727 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY, 728 .len = NFT_USERDATA_MAXLEN } 729 }; 730 731 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, 732 u32 portid, u32 seq, int event, u32 flags, 733 int family, const struct nft_table *table) 734 { 735 struct nlmsghdr *nlh; 736 737 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 738 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 739 NFNETLINK_V0, nft_base_seq(net)); 740 if (!nlh) 741 goto nla_put_failure; 742 743 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || 744 nla_put_be32(skb, NFTA_TABLE_FLAGS, 745 htonl(table->flags & NFT_TABLE_F_MASK)) || 746 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) || 747 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle), 748 NFTA_TABLE_PAD)) 749 goto nla_put_failure; 750 if (nft_table_has_owner(table) && 751 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid))) 752 goto nla_put_failure; 753 754 if (table->udata) { 755 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata)) 756 goto nla_put_failure; 757 } 758 759 nlmsg_end(skb, nlh); 760 return 0; 761 762 nla_put_failure: 763 nlmsg_trim(skb, nlh); 764 return -1; 765 } 766 767 struct nftnl_skb_parms { 768 bool report; 769 }; 770 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb)) 771 772 static void nft_notify_enqueue(struct sk_buff *skb, bool report, 773 struct list_head *notify_list) 774 { 775 NFT_CB(skb).report = report; 776 list_add_tail(&skb->list, notify_list); 777 } 778 779 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) 780 { 781 struct nftables_pernet *nft_net; 782 struct sk_buff *skb; 783 u16 flags = 0; 784 int err; 785 786 if (!ctx->report && 787 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 788 return; 789 790 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 791 if (skb == NULL) 792 goto err; 793 794 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 795 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 796 797 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, 798 event, flags, ctx->family, ctx->table); 799 if (err < 0) { 800 kfree_skb(skb); 801 goto err; 802 } 803 804 nft_net = nft_pernet(ctx->net); 805 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 806 return; 807 err: 808 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 809 } 810 811 static int nf_tables_dump_tables(struct sk_buff *skb, 812 struct netlink_callback *cb) 813 { 814 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 815 struct nftables_pernet *nft_net; 816 const struct nft_table *table; 817 unsigned int idx = 0, s_idx = cb->args[0]; 818 struct net *net = sock_net(skb->sk); 819 int family = nfmsg->nfgen_family; 820 821 rcu_read_lock(); 822 nft_net = nft_pernet(net); 823 cb->seq = nft_net->base_seq; 824 825 list_for_each_entry_rcu(table, &nft_net->tables, list) { 826 if (family != NFPROTO_UNSPEC && family != table->family) 827 continue; 828 829 if (idx < s_idx) 830 goto cont; 831 if (idx > s_idx) 832 memset(&cb->args[1], 0, 833 sizeof(cb->args) - sizeof(cb->args[0])); 834 if (!nft_is_active(net, table)) 835 continue; 836 if (nf_tables_fill_table_info(skb, net, 837 NETLINK_CB(cb->skb).portid, 838 cb->nlh->nlmsg_seq, 839 NFT_MSG_NEWTABLE, NLM_F_MULTI, 840 table->family, table) < 0) 841 goto done; 842 843 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 844 cont: 845 idx++; 846 } 847 done: 848 rcu_read_unlock(); 849 cb->args[0] = idx; 850 return skb->len; 851 } 852 853 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb, 854 const struct nlmsghdr *nlh, 855 struct netlink_dump_control *c) 856 { 857 int err; 858 859 if (!try_module_get(THIS_MODULE)) 860 return -EINVAL; 861 862 rcu_read_unlock(); 863 err = netlink_dump_start(nlsk, skb, nlh, c); 864 rcu_read_lock(); 865 module_put(THIS_MODULE); 866 867 return err; 868 } 869 870 /* called with rcu_read_lock held */ 871 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info, 872 const struct nlattr * const nla[]) 873 { 874 struct netlink_ext_ack *extack = info->extack; 875 u8 genmask = nft_genmask_cur(info->net); 876 u8 family = info->nfmsg->nfgen_family; 877 const struct nft_table *table; 878 struct net *net = info->net; 879 struct sk_buff *skb2; 880 int err; 881 882 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 883 struct netlink_dump_control c = { 884 .dump = nf_tables_dump_tables, 885 .module = THIS_MODULE, 886 }; 887 888 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 889 } 890 891 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0); 892 if (IS_ERR(table)) { 893 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]); 894 return PTR_ERR(table); 895 } 896 897 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 898 if (!skb2) 899 return -ENOMEM; 900 901 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, 902 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 903 0, family, table); 904 if (err < 0) 905 goto err_fill_table_info; 906 907 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 908 909 err_fill_table_info: 910 kfree_skb(skb2); 911 return err; 912 } 913 914 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt) 915 { 916 struct nft_chain *chain; 917 u32 i = 0; 918 919 list_for_each_entry(chain, &table->chains, list) { 920 if (!nft_is_active_next(net, chain)) 921 continue; 922 if (!nft_is_base_chain(chain)) 923 continue; 924 925 if (cnt && i++ == cnt) 926 break; 927 928 nf_tables_unregister_hook(net, table, chain); 929 } 930 } 931 932 static int nf_tables_table_enable(struct net *net, struct nft_table *table) 933 { 934 struct nft_chain *chain; 935 int err, i = 0; 936 937 list_for_each_entry(chain, &table->chains, list) { 938 if (!nft_is_active_next(net, chain)) 939 continue; 940 if (!nft_is_base_chain(chain)) 941 continue; 942 943 err = nf_tables_register_hook(net, table, chain); 944 if (err < 0) 945 goto err_register_hooks; 946 947 i++; 948 } 949 return 0; 950 951 err_register_hooks: 952 if (i) 953 nft_table_disable(net, table, i); 954 return err; 955 } 956 957 static void nf_tables_table_disable(struct net *net, struct nft_table *table) 958 { 959 table->flags &= ~NFT_TABLE_F_DORMANT; 960 nft_table_disable(net, table, 0); 961 table->flags |= NFT_TABLE_F_DORMANT; 962 } 963 964 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1) 965 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0) 966 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1) 967 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \ 968 __NFT_TABLE_F_WAS_AWAKEN) 969 970 static int nf_tables_updtable(struct nft_ctx *ctx) 971 { 972 struct nft_trans *trans; 973 u32 flags; 974 int ret; 975 976 if (!ctx->nla[NFTA_TABLE_FLAGS]) 977 return 0; 978 979 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); 980 if (flags & ~NFT_TABLE_F_MASK) 981 return -EOPNOTSUPP; 982 983 if (flags == ctx->table->flags) 984 return 0; 985 986 if ((nft_table_has_owner(ctx->table) && 987 !(flags & NFT_TABLE_F_OWNER)) || 988 (!nft_table_has_owner(ctx->table) && 989 flags & NFT_TABLE_F_OWNER)) 990 return -EOPNOTSUPP; 991 992 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, 993 sizeof(struct nft_trans_table)); 994 if (trans == NULL) 995 return -ENOMEM; 996 997 if ((flags & NFT_TABLE_F_DORMANT) && 998 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { 999 ctx->table->flags |= NFT_TABLE_F_DORMANT; 1000 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) 1001 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN; 1002 } else if (!(flags & NFT_TABLE_F_DORMANT) && 1003 ctx->table->flags & NFT_TABLE_F_DORMANT) { 1004 ctx->table->flags &= ~NFT_TABLE_F_DORMANT; 1005 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) { 1006 ret = nf_tables_table_enable(ctx->net, ctx->table); 1007 if (ret < 0) 1008 goto err_register_hooks; 1009 1010 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT; 1011 } 1012 } 1013 1014 nft_trans_table_update(trans) = true; 1015 nft_trans_commit_list_add_tail(ctx->net, trans); 1016 1017 return 0; 1018 1019 err_register_hooks: 1020 nft_trans_destroy(trans); 1021 return ret; 1022 } 1023 1024 static u32 nft_chain_hash(const void *data, u32 len, u32 seed) 1025 { 1026 const char *name = data; 1027 1028 return jhash(name, strlen(name), seed); 1029 } 1030 1031 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed) 1032 { 1033 const struct nft_chain *chain = data; 1034 1035 return nft_chain_hash(chain->name, 0, seed); 1036 } 1037 1038 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg, 1039 const void *ptr) 1040 { 1041 const struct nft_chain *chain = ptr; 1042 const char *name = arg->key; 1043 1044 return strcmp(chain->name, name); 1045 } 1046 1047 static u32 nft_objname_hash(const void *data, u32 len, u32 seed) 1048 { 1049 const struct nft_object_hash_key *k = data; 1050 1051 seed ^= hash_ptr(k->table, 32); 1052 1053 return jhash(k->name, strlen(k->name), seed); 1054 } 1055 1056 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed) 1057 { 1058 const struct nft_object *obj = data; 1059 1060 return nft_objname_hash(&obj->key, 0, seed); 1061 } 1062 1063 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg, 1064 const void *ptr) 1065 { 1066 const struct nft_object_hash_key *k = arg->key; 1067 const struct nft_object *obj = ptr; 1068 1069 if (obj->key.table != k->table) 1070 return -1; 1071 1072 return strcmp(obj->key.name, k->name); 1073 } 1074 1075 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info, 1076 const struct nlattr * const nla[]) 1077 { 1078 struct nftables_pernet *nft_net = nft_pernet(info->net); 1079 struct netlink_ext_ack *extack = info->extack; 1080 u8 genmask = nft_genmask_next(info->net); 1081 u8 family = info->nfmsg->nfgen_family; 1082 struct net *net = info->net; 1083 const struct nlattr *attr; 1084 struct nft_table *table; 1085 struct nft_ctx ctx; 1086 u32 flags = 0; 1087 int err; 1088 1089 lockdep_assert_held(&nft_net->commit_mutex); 1090 attr = nla[NFTA_TABLE_NAME]; 1091 table = nft_table_lookup(net, attr, family, genmask, 1092 NETLINK_CB(skb).portid); 1093 if (IS_ERR(table)) { 1094 if (PTR_ERR(table) != -ENOENT) 1095 return PTR_ERR(table); 1096 } else { 1097 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 1098 NL_SET_BAD_ATTR(extack, attr); 1099 return -EEXIST; 1100 } 1101 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 1102 return -EOPNOTSUPP; 1103 1104 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 1105 1106 return nf_tables_updtable(&ctx); 1107 } 1108 1109 if (nla[NFTA_TABLE_FLAGS]) { 1110 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); 1111 if (flags & ~NFT_TABLE_F_MASK) 1112 return -EOPNOTSUPP; 1113 } 1114 1115 err = -ENOMEM; 1116 table = kzalloc(sizeof(*table), GFP_KERNEL); 1117 if (table == NULL) 1118 goto err_kzalloc; 1119 1120 table->name = nla_strdup(attr, GFP_KERNEL); 1121 if (table->name == NULL) 1122 goto err_strdup; 1123 1124 if (nla[NFTA_TABLE_USERDATA]) { 1125 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL); 1126 if (table->udata == NULL) 1127 goto err_table_udata; 1128 1129 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]); 1130 } 1131 1132 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params); 1133 if (err) 1134 goto err_chain_ht; 1135 1136 INIT_LIST_HEAD(&table->chains); 1137 INIT_LIST_HEAD(&table->sets); 1138 INIT_LIST_HEAD(&table->objects); 1139 INIT_LIST_HEAD(&table->flowtables); 1140 table->family = family; 1141 table->flags = flags; 1142 table->handle = ++table_handle; 1143 if (table->flags & NFT_TABLE_F_OWNER) 1144 table->nlpid = NETLINK_CB(skb).portid; 1145 1146 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 1147 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); 1148 if (err < 0) 1149 goto err_trans; 1150 1151 list_add_tail_rcu(&table->list, &nft_net->tables); 1152 return 0; 1153 err_trans: 1154 rhltable_destroy(&table->chains_ht); 1155 err_chain_ht: 1156 kfree(table->udata); 1157 err_table_udata: 1158 kfree(table->name); 1159 err_strdup: 1160 kfree(table); 1161 err_kzalloc: 1162 return err; 1163 } 1164 1165 static int nft_flush_table(struct nft_ctx *ctx) 1166 { 1167 struct nft_flowtable *flowtable, *nft; 1168 struct nft_chain *chain, *nc; 1169 struct nft_object *obj, *ne; 1170 struct nft_set *set, *ns; 1171 int err; 1172 1173 list_for_each_entry(chain, &ctx->table->chains, list) { 1174 if (!nft_is_active_next(ctx->net, chain)) 1175 continue; 1176 1177 if (nft_chain_is_bound(chain)) 1178 continue; 1179 1180 ctx->chain = chain; 1181 1182 err = nft_delrule_by_chain(ctx); 1183 if (err < 0) 1184 goto out; 1185 } 1186 1187 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { 1188 if (!nft_is_active_next(ctx->net, set)) 1189 continue; 1190 1191 if (nft_set_is_anonymous(set) && 1192 !list_empty(&set->bindings)) 1193 continue; 1194 1195 err = nft_delset(ctx, set); 1196 if (err < 0) 1197 goto out; 1198 } 1199 1200 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) { 1201 if (!nft_is_active_next(ctx->net, flowtable)) 1202 continue; 1203 1204 err = nft_delflowtable(ctx, flowtable); 1205 if (err < 0) 1206 goto out; 1207 } 1208 1209 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { 1210 if (!nft_is_active_next(ctx->net, obj)) 1211 continue; 1212 1213 err = nft_delobj(ctx, obj); 1214 if (err < 0) 1215 goto out; 1216 } 1217 1218 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { 1219 if (!nft_is_active_next(ctx->net, chain)) 1220 continue; 1221 1222 if (nft_chain_is_bound(chain)) 1223 continue; 1224 1225 ctx->chain = chain; 1226 1227 err = nft_delchain(ctx); 1228 if (err < 0) 1229 goto out; 1230 } 1231 1232 err = nft_deltable(ctx); 1233 out: 1234 return err; 1235 } 1236 1237 static int nft_flush(struct nft_ctx *ctx, int family) 1238 { 1239 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 1240 const struct nlattr * const *nla = ctx->nla; 1241 struct nft_table *table, *nt; 1242 int err = 0; 1243 1244 list_for_each_entry_safe(table, nt, &nft_net->tables, list) { 1245 if (family != AF_UNSPEC && table->family != family) 1246 continue; 1247 1248 ctx->family = table->family; 1249 1250 if (!nft_is_active_next(ctx->net, table)) 1251 continue; 1252 1253 if (nft_table_has_owner(table) && table->nlpid != ctx->portid) 1254 continue; 1255 1256 if (nla[NFTA_TABLE_NAME] && 1257 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) 1258 continue; 1259 1260 ctx->table = table; 1261 1262 err = nft_flush_table(ctx); 1263 if (err < 0) 1264 goto out; 1265 } 1266 out: 1267 return err; 1268 } 1269 1270 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info, 1271 const struct nlattr * const nla[]) 1272 { 1273 struct netlink_ext_ack *extack = info->extack; 1274 u8 genmask = nft_genmask_next(info->net); 1275 u8 family = info->nfmsg->nfgen_family; 1276 struct net *net = info->net; 1277 const struct nlattr *attr; 1278 struct nft_table *table; 1279 struct nft_ctx ctx; 1280 1281 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla); 1282 if (family == AF_UNSPEC || 1283 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE])) 1284 return nft_flush(&ctx, family); 1285 1286 if (nla[NFTA_TABLE_HANDLE]) { 1287 attr = nla[NFTA_TABLE_HANDLE]; 1288 table = nft_table_lookup_byhandle(net, attr, genmask, 1289 NETLINK_CB(skb).portid); 1290 } else { 1291 attr = nla[NFTA_TABLE_NAME]; 1292 table = nft_table_lookup(net, attr, family, genmask, 1293 NETLINK_CB(skb).portid); 1294 } 1295 1296 if (IS_ERR(table)) { 1297 NL_SET_BAD_ATTR(extack, attr); 1298 return PTR_ERR(table); 1299 } 1300 1301 if (info->nlh->nlmsg_flags & NLM_F_NONREC && 1302 table->use > 0) 1303 return -EBUSY; 1304 1305 ctx.family = family; 1306 ctx.table = table; 1307 1308 return nft_flush_table(&ctx); 1309 } 1310 1311 static void nf_tables_table_destroy(struct nft_ctx *ctx) 1312 { 1313 if (WARN_ON(ctx->table->use > 0)) 1314 return; 1315 1316 rhltable_destroy(&ctx->table->chains_ht); 1317 kfree(ctx->table->name); 1318 kfree(ctx->table->udata); 1319 kfree(ctx->table); 1320 } 1321 1322 void nft_register_chain_type(const struct nft_chain_type *ctype) 1323 { 1324 nfnl_lock(NFNL_SUBSYS_NFTABLES); 1325 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) { 1326 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 1327 return; 1328 } 1329 chain_type[ctype->family][ctype->type] = ctype; 1330 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 1331 } 1332 EXPORT_SYMBOL_GPL(nft_register_chain_type); 1333 1334 void nft_unregister_chain_type(const struct nft_chain_type *ctype) 1335 { 1336 nfnl_lock(NFNL_SUBSYS_NFTABLES); 1337 chain_type[ctype->family][ctype->type] = NULL; 1338 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 1339 } 1340 EXPORT_SYMBOL_GPL(nft_unregister_chain_type); 1341 1342 /* 1343 * Chains 1344 */ 1345 1346 static struct nft_chain * 1347 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask) 1348 { 1349 struct nft_chain *chain; 1350 1351 list_for_each_entry(chain, &table->chains, list) { 1352 if (chain->handle == handle && 1353 nft_active_genmask(chain, genmask)) 1354 return chain; 1355 } 1356 1357 return ERR_PTR(-ENOENT); 1358 } 1359 1360 static bool lockdep_commit_lock_is_held(const struct net *net) 1361 { 1362 #ifdef CONFIG_PROVE_LOCKING 1363 struct nftables_pernet *nft_net = nft_pernet(net); 1364 1365 return lockdep_is_held(&nft_net->commit_mutex); 1366 #else 1367 return true; 1368 #endif 1369 } 1370 1371 static struct nft_chain *nft_chain_lookup(struct net *net, 1372 struct nft_table *table, 1373 const struct nlattr *nla, u8 genmask) 1374 { 1375 char search[NFT_CHAIN_MAXNAMELEN + 1]; 1376 struct rhlist_head *tmp, *list; 1377 struct nft_chain *chain; 1378 1379 if (nla == NULL) 1380 return ERR_PTR(-EINVAL); 1381 1382 nla_strscpy(search, nla, sizeof(search)); 1383 1384 WARN_ON(!rcu_read_lock_held() && 1385 !lockdep_commit_lock_is_held(net)); 1386 1387 chain = ERR_PTR(-ENOENT); 1388 rcu_read_lock(); 1389 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params); 1390 if (!list) 1391 goto out_unlock; 1392 1393 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { 1394 if (nft_active_genmask(chain, genmask)) 1395 goto out_unlock; 1396 } 1397 chain = ERR_PTR(-ENOENT); 1398 out_unlock: 1399 rcu_read_unlock(); 1400 return chain; 1401 } 1402 1403 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { 1404 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, 1405 .len = NFT_TABLE_MAXNAMELEN - 1 }, 1406 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, 1407 [NFTA_CHAIN_NAME] = { .type = NLA_STRING, 1408 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 1409 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, 1410 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, 1411 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING, 1412 .len = NFT_MODULE_AUTOLOAD_LIMIT }, 1413 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, 1414 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 }, 1415 [NFTA_CHAIN_ID] = { .type = NLA_U32 }, 1416 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY, 1417 .len = NFT_USERDATA_MAXLEN }, 1418 }; 1419 1420 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { 1421 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, 1422 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, 1423 [NFTA_HOOK_DEV] = { .type = NLA_STRING, 1424 .len = IFNAMSIZ - 1 }, 1425 }; 1426 1427 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) 1428 { 1429 struct nft_stats *cpu_stats, total; 1430 struct nlattr *nest; 1431 unsigned int seq; 1432 u64 pkts, bytes; 1433 int cpu; 1434 1435 if (!stats) 1436 return 0; 1437 1438 memset(&total, 0, sizeof(total)); 1439 for_each_possible_cpu(cpu) { 1440 cpu_stats = per_cpu_ptr(stats, cpu); 1441 do { 1442 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 1443 pkts = cpu_stats->pkts; 1444 bytes = cpu_stats->bytes; 1445 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); 1446 total.pkts += pkts; 1447 total.bytes += bytes; 1448 } 1449 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS); 1450 if (nest == NULL) 1451 goto nla_put_failure; 1452 1453 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), 1454 NFTA_COUNTER_PAD) || 1455 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), 1456 NFTA_COUNTER_PAD)) 1457 goto nla_put_failure; 1458 1459 nla_nest_end(skb, nest); 1460 return 0; 1461 1462 nla_put_failure: 1463 return -ENOSPC; 1464 } 1465 1466 static int nft_dump_basechain_hook(struct sk_buff *skb, int family, 1467 const struct nft_base_chain *basechain) 1468 { 1469 const struct nf_hook_ops *ops = &basechain->ops; 1470 struct nft_hook *hook, *first = NULL; 1471 struct nlattr *nest, *nest_devs; 1472 int n = 0; 1473 1474 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK); 1475 if (nest == NULL) 1476 goto nla_put_failure; 1477 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) 1478 goto nla_put_failure; 1479 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) 1480 goto nla_put_failure; 1481 1482 if (nft_base_chain_netdev(family, ops->hooknum)) { 1483 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS); 1484 list_for_each_entry(hook, &basechain->hook_list, list) { 1485 if (!first) 1486 first = hook; 1487 1488 if (nla_put_string(skb, NFTA_DEVICE_NAME, 1489 hook->ops.dev->name)) 1490 goto nla_put_failure; 1491 n++; 1492 } 1493 nla_nest_end(skb, nest_devs); 1494 1495 if (n == 1 && 1496 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name)) 1497 goto nla_put_failure; 1498 } 1499 nla_nest_end(skb, nest); 1500 1501 return 0; 1502 nla_put_failure: 1503 return -1; 1504 } 1505 1506 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, 1507 u32 portid, u32 seq, int event, u32 flags, 1508 int family, const struct nft_table *table, 1509 const struct nft_chain *chain) 1510 { 1511 struct nlmsghdr *nlh; 1512 1513 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 1514 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 1515 NFNETLINK_V0, nft_base_seq(net)); 1516 if (!nlh) 1517 goto nla_put_failure; 1518 1519 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) 1520 goto nla_put_failure; 1521 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), 1522 NFTA_CHAIN_PAD)) 1523 goto nla_put_failure; 1524 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) 1525 goto nla_put_failure; 1526 1527 if (nft_is_base_chain(chain)) { 1528 const struct nft_base_chain *basechain = nft_base_chain(chain); 1529 struct nft_stats __percpu *stats; 1530 1531 if (nft_dump_basechain_hook(skb, family, basechain)) 1532 goto nla_put_failure; 1533 1534 if (nla_put_be32(skb, NFTA_CHAIN_POLICY, 1535 htonl(basechain->policy))) 1536 goto nla_put_failure; 1537 1538 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) 1539 goto nla_put_failure; 1540 1541 stats = rcu_dereference_check(basechain->stats, 1542 lockdep_commit_lock_is_held(net)); 1543 if (nft_dump_stats(skb, stats)) 1544 goto nla_put_failure; 1545 } 1546 1547 if (chain->flags && 1548 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags))) 1549 goto nla_put_failure; 1550 1551 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) 1552 goto nla_put_failure; 1553 1554 if (chain->udata && 1555 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata)) 1556 goto nla_put_failure; 1557 1558 nlmsg_end(skb, nlh); 1559 return 0; 1560 1561 nla_put_failure: 1562 nlmsg_trim(skb, nlh); 1563 return -1; 1564 } 1565 1566 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) 1567 { 1568 struct nftables_pernet *nft_net; 1569 struct sk_buff *skb; 1570 u16 flags = 0; 1571 int err; 1572 1573 if (!ctx->report && 1574 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 1575 return; 1576 1577 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1578 if (skb == NULL) 1579 goto err; 1580 1581 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 1582 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 1583 1584 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, 1585 event, flags, ctx->family, ctx->table, 1586 ctx->chain); 1587 if (err < 0) { 1588 kfree_skb(skb); 1589 goto err; 1590 } 1591 1592 nft_net = nft_pernet(ctx->net); 1593 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 1594 return; 1595 err: 1596 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 1597 } 1598 1599 static int nf_tables_dump_chains(struct sk_buff *skb, 1600 struct netlink_callback *cb) 1601 { 1602 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 1603 unsigned int idx = 0, s_idx = cb->args[0]; 1604 struct net *net = sock_net(skb->sk); 1605 int family = nfmsg->nfgen_family; 1606 struct nftables_pernet *nft_net; 1607 const struct nft_table *table; 1608 const struct nft_chain *chain; 1609 1610 rcu_read_lock(); 1611 nft_net = nft_pernet(net); 1612 cb->seq = nft_net->base_seq; 1613 1614 list_for_each_entry_rcu(table, &nft_net->tables, list) { 1615 if (family != NFPROTO_UNSPEC && family != table->family) 1616 continue; 1617 1618 list_for_each_entry_rcu(chain, &table->chains, list) { 1619 if (idx < s_idx) 1620 goto cont; 1621 if (idx > s_idx) 1622 memset(&cb->args[1], 0, 1623 sizeof(cb->args) - sizeof(cb->args[0])); 1624 if (!nft_is_active(net, chain)) 1625 continue; 1626 if (nf_tables_fill_chain_info(skb, net, 1627 NETLINK_CB(cb->skb).portid, 1628 cb->nlh->nlmsg_seq, 1629 NFT_MSG_NEWCHAIN, 1630 NLM_F_MULTI, 1631 table->family, table, 1632 chain) < 0) 1633 goto done; 1634 1635 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1636 cont: 1637 idx++; 1638 } 1639 } 1640 done: 1641 rcu_read_unlock(); 1642 cb->args[0] = idx; 1643 return skb->len; 1644 } 1645 1646 /* called with rcu_read_lock held */ 1647 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info, 1648 const struct nlattr * const nla[]) 1649 { 1650 struct netlink_ext_ack *extack = info->extack; 1651 u8 genmask = nft_genmask_cur(info->net); 1652 u8 family = info->nfmsg->nfgen_family; 1653 const struct nft_chain *chain; 1654 struct net *net = info->net; 1655 struct nft_table *table; 1656 struct sk_buff *skb2; 1657 int err; 1658 1659 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 1660 struct netlink_dump_control c = { 1661 .dump = nf_tables_dump_chains, 1662 .module = THIS_MODULE, 1663 }; 1664 1665 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 1666 } 1667 1668 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0); 1669 if (IS_ERR(table)) { 1670 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 1671 return PTR_ERR(table); 1672 } 1673 1674 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask); 1675 if (IS_ERR(chain)) { 1676 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 1677 return PTR_ERR(chain); 1678 } 1679 1680 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 1681 if (!skb2) 1682 return -ENOMEM; 1683 1684 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, 1685 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 1686 0, family, table, chain); 1687 if (err < 0) 1688 goto err_fill_chain_info; 1689 1690 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 1691 1692 err_fill_chain_info: 1693 kfree_skb(skb2); 1694 return err; 1695 } 1696 1697 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { 1698 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, 1699 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, 1700 }; 1701 1702 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) 1703 { 1704 struct nlattr *tb[NFTA_COUNTER_MAX+1]; 1705 struct nft_stats __percpu *newstats; 1706 struct nft_stats *stats; 1707 int err; 1708 1709 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr, 1710 nft_counter_policy, NULL); 1711 if (err < 0) 1712 return ERR_PTR(err); 1713 1714 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) 1715 return ERR_PTR(-EINVAL); 1716 1717 newstats = netdev_alloc_pcpu_stats(struct nft_stats); 1718 if (newstats == NULL) 1719 return ERR_PTR(-ENOMEM); 1720 1721 /* Restore old counters on this cpu, no problem. Per-cpu statistics 1722 * are not exposed to userspace. 1723 */ 1724 preempt_disable(); 1725 stats = this_cpu_ptr(newstats); 1726 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); 1727 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); 1728 preempt_enable(); 1729 1730 return newstats; 1731 } 1732 1733 static void nft_chain_stats_replace(struct nft_trans *trans) 1734 { 1735 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain); 1736 1737 if (!nft_trans_chain_stats(trans)) 1738 return; 1739 1740 nft_trans_chain_stats(trans) = 1741 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans), 1742 lockdep_commit_lock_is_held(trans->ctx.net)); 1743 1744 if (!nft_trans_chain_stats(trans)) 1745 static_branch_inc(&nft_counters_enabled); 1746 } 1747 1748 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain) 1749 { 1750 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0); 1751 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1); 1752 1753 if (g0 != g1) 1754 kvfree(g1); 1755 kvfree(g0); 1756 1757 /* should be NULL either via abort or via successful commit */ 1758 WARN_ON_ONCE(chain->rules_next); 1759 kvfree(chain->rules_next); 1760 } 1761 1762 void nf_tables_chain_destroy(struct nft_ctx *ctx) 1763 { 1764 struct nft_chain *chain = ctx->chain; 1765 struct nft_hook *hook, *next; 1766 1767 if (WARN_ON(chain->use > 0)) 1768 return; 1769 1770 /* no concurrent access possible anymore */ 1771 nf_tables_chain_free_chain_rules(chain); 1772 1773 if (nft_is_base_chain(chain)) { 1774 struct nft_base_chain *basechain = nft_base_chain(chain); 1775 1776 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) { 1777 list_for_each_entry_safe(hook, next, 1778 &basechain->hook_list, list) { 1779 list_del_rcu(&hook->list); 1780 kfree_rcu(hook, rcu); 1781 } 1782 } 1783 module_put(basechain->type->owner); 1784 if (rcu_access_pointer(basechain->stats)) { 1785 static_branch_dec(&nft_counters_enabled); 1786 free_percpu(rcu_dereference_raw(basechain->stats)); 1787 } 1788 kfree(chain->name); 1789 kfree(chain->udata); 1790 kfree(basechain); 1791 } else { 1792 kfree(chain->name); 1793 kfree(chain->udata); 1794 kfree(chain); 1795 } 1796 } 1797 1798 static struct nft_hook *nft_netdev_hook_alloc(struct net *net, 1799 const struct nlattr *attr) 1800 { 1801 struct net_device *dev; 1802 char ifname[IFNAMSIZ]; 1803 struct nft_hook *hook; 1804 int err; 1805 1806 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL); 1807 if (!hook) { 1808 err = -ENOMEM; 1809 goto err_hook_alloc; 1810 } 1811 1812 nla_strscpy(ifname, attr, IFNAMSIZ); 1813 /* nf_tables_netdev_event() is called under rtnl_mutex, this is 1814 * indirectly serializing all the other holders of the commit_mutex with 1815 * the rtnl_mutex. 1816 */ 1817 dev = __dev_get_by_name(net, ifname); 1818 if (!dev) { 1819 err = -ENOENT; 1820 goto err_hook_dev; 1821 } 1822 hook->ops.dev = dev; 1823 hook->inactive = false; 1824 1825 return hook; 1826 1827 err_hook_dev: 1828 kfree(hook); 1829 err_hook_alloc: 1830 return ERR_PTR(err); 1831 } 1832 1833 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list, 1834 const struct nft_hook *this) 1835 { 1836 struct nft_hook *hook; 1837 1838 list_for_each_entry(hook, hook_list, list) { 1839 if (this->ops.dev == hook->ops.dev) 1840 return hook; 1841 } 1842 1843 return NULL; 1844 } 1845 1846 static int nf_tables_parse_netdev_hooks(struct net *net, 1847 const struct nlattr *attr, 1848 struct list_head *hook_list) 1849 { 1850 struct nft_hook *hook, *next; 1851 const struct nlattr *tmp; 1852 int rem, n = 0, err; 1853 1854 nla_for_each_nested(tmp, attr, rem) { 1855 if (nla_type(tmp) != NFTA_DEVICE_NAME) { 1856 err = -EINVAL; 1857 goto err_hook; 1858 } 1859 1860 hook = nft_netdev_hook_alloc(net, tmp); 1861 if (IS_ERR(hook)) { 1862 err = PTR_ERR(hook); 1863 goto err_hook; 1864 } 1865 if (nft_hook_list_find(hook_list, hook)) { 1866 kfree(hook); 1867 err = -EEXIST; 1868 goto err_hook; 1869 } 1870 list_add_tail(&hook->list, hook_list); 1871 n++; 1872 1873 if (n == NFT_NETDEVICE_MAX) { 1874 err = -EFBIG; 1875 goto err_hook; 1876 } 1877 } 1878 1879 return 0; 1880 1881 err_hook: 1882 list_for_each_entry_safe(hook, next, hook_list, list) { 1883 list_del(&hook->list); 1884 kfree(hook); 1885 } 1886 return err; 1887 } 1888 1889 struct nft_chain_hook { 1890 u32 num; 1891 s32 priority; 1892 const struct nft_chain_type *type; 1893 struct list_head list; 1894 }; 1895 1896 static int nft_chain_parse_netdev(struct net *net, 1897 struct nlattr *tb[], 1898 struct list_head *hook_list) 1899 { 1900 struct nft_hook *hook; 1901 int err; 1902 1903 if (tb[NFTA_HOOK_DEV]) { 1904 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]); 1905 if (IS_ERR(hook)) 1906 return PTR_ERR(hook); 1907 1908 list_add_tail(&hook->list, hook_list); 1909 } else if (tb[NFTA_HOOK_DEVS]) { 1910 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS], 1911 hook_list); 1912 if (err < 0) 1913 return err; 1914 1915 if (list_empty(hook_list)) 1916 return -EINVAL; 1917 } else { 1918 return -EINVAL; 1919 } 1920 1921 return 0; 1922 } 1923 1924 static int nft_chain_parse_hook(struct net *net, 1925 const struct nlattr * const nla[], 1926 struct nft_chain_hook *hook, u8 family, 1927 struct netlink_ext_ack *extack, bool autoload) 1928 { 1929 struct nftables_pernet *nft_net = nft_pernet(net); 1930 struct nlattr *ha[NFTA_HOOK_MAX + 1]; 1931 const struct nft_chain_type *type; 1932 int err; 1933 1934 lockdep_assert_held(&nft_net->commit_mutex); 1935 lockdep_nfnl_nft_mutex_not_held(); 1936 1937 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX, 1938 nla[NFTA_CHAIN_HOOK], 1939 nft_hook_policy, NULL); 1940 if (err < 0) 1941 return err; 1942 1943 if (ha[NFTA_HOOK_HOOKNUM] == NULL || 1944 ha[NFTA_HOOK_PRIORITY] == NULL) 1945 return -EINVAL; 1946 1947 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); 1948 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); 1949 1950 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT); 1951 if (!type) 1952 return -EOPNOTSUPP; 1953 1954 if (nla[NFTA_CHAIN_TYPE]) { 1955 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE], 1956 family, autoload); 1957 if (IS_ERR(type)) { 1958 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]); 1959 return PTR_ERR(type); 1960 } 1961 } 1962 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num))) 1963 return -EOPNOTSUPP; 1964 1965 if (type->type == NFT_CHAIN_T_NAT && 1966 hook->priority <= NF_IP_PRI_CONNTRACK) 1967 return -EOPNOTSUPP; 1968 1969 if (!try_module_get(type->owner)) { 1970 if (nla[NFTA_CHAIN_TYPE]) 1971 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]); 1972 return -ENOENT; 1973 } 1974 1975 hook->type = type; 1976 1977 INIT_LIST_HEAD(&hook->list); 1978 if (nft_base_chain_netdev(family, hook->num)) { 1979 err = nft_chain_parse_netdev(net, ha, &hook->list); 1980 if (err < 0) { 1981 module_put(type->owner); 1982 return err; 1983 } 1984 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) { 1985 module_put(type->owner); 1986 return -EOPNOTSUPP; 1987 } 1988 1989 return 0; 1990 } 1991 1992 static void nft_chain_release_hook(struct nft_chain_hook *hook) 1993 { 1994 struct nft_hook *h, *next; 1995 1996 list_for_each_entry_safe(h, next, &hook->list, list) { 1997 list_del(&h->list); 1998 kfree(h); 1999 } 2000 module_put(hook->type->owner); 2001 } 2002 2003 struct nft_rules_old { 2004 struct rcu_head h; 2005 struct nft_rule **start; 2006 }; 2007 2008 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain, 2009 unsigned int alloc) 2010 { 2011 if (alloc > INT_MAX) 2012 return NULL; 2013 2014 alloc += 1; /* NULL, ends rules */ 2015 if (sizeof(struct nft_rule *) > INT_MAX / alloc) 2016 return NULL; 2017 2018 alloc *= sizeof(struct nft_rule *); 2019 alloc += sizeof(struct nft_rules_old); 2020 2021 return kvmalloc(alloc, GFP_KERNEL); 2022 } 2023 2024 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family, 2025 const struct nft_chain_hook *hook, 2026 struct nft_chain *chain) 2027 { 2028 ops->pf = family; 2029 ops->hooknum = hook->num; 2030 ops->priority = hook->priority; 2031 ops->priv = chain; 2032 ops->hook = hook->type->hooks[ops->hooknum]; 2033 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES; 2034 } 2035 2036 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family, 2037 struct nft_chain_hook *hook, u32 flags) 2038 { 2039 struct nft_chain *chain; 2040 struct nft_hook *h; 2041 2042 basechain->type = hook->type; 2043 INIT_LIST_HEAD(&basechain->hook_list); 2044 chain = &basechain->chain; 2045 2046 if (nft_base_chain_netdev(family, hook->num)) { 2047 list_splice_init(&hook->list, &basechain->hook_list); 2048 list_for_each_entry(h, &basechain->hook_list, list) 2049 nft_basechain_hook_init(&h->ops, family, hook, chain); 2050 2051 basechain->ops.hooknum = hook->num; 2052 basechain->ops.priority = hook->priority; 2053 } else { 2054 nft_basechain_hook_init(&basechain->ops, family, hook, chain); 2055 } 2056 2057 chain->flags |= NFT_CHAIN_BASE | flags; 2058 basechain->policy = NF_ACCEPT; 2059 if (chain->flags & NFT_CHAIN_HW_OFFLOAD && 2060 nft_chain_offload_priority(basechain) < 0) 2061 return -EOPNOTSUPP; 2062 2063 flow_block_init(&basechain->flow_block); 2064 2065 return 0; 2066 } 2067 2068 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain) 2069 { 2070 int err; 2071 2072 err = rhltable_insert_key(&table->chains_ht, chain->name, 2073 &chain->rhlhead, nft_chain_ht_params); 2074 if (err) 2075 return err; 2076 2077 list_add_tail_rcu(&chain->list, &table->chains); 2078 2079 return 0; 2080 } 2081 2082 static u64 chain_id; 2083 2084 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, 2085 u8 policy, u32 flags, 2086 struct netlink_ext_ack *extack) 2087 { 2088 const struct nlattr * const *nla = ctx->nla; 2089 struct nft_table *table = ctx->table; 2090 struct nft_base_chain *basechain; 2091 struct nft_stats __percpu *stats; 2092 struct net *net = ctx->net; 2093 char name[NFT_NAME_MAXLEN]; 2094 struct nft_trans *trans; 2095 struct nft_chain *chain; 2096 struct nft_rule **rules; 2097 int err; 2098 2099 if (table->use == UINT_MAX) 2100 return -EOVERFLOW; 2101 2102 if (nla[NFTA_CHAIN_HOOK]) { 2103 struct nft_chain_hook hook; 2104 2105 if (flags & NFT_CHAIN_BINDING) 2106 return -EOPNOTSUPP; 2107 2108 err = nft_chain_parse_hook(net, nla, &hook, family, extack, 2109 true); 2110 if (err < 0) 2111 return err; 2112 2113 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL); 2114 if (basechain == NULL) { 2115 nft_chain_release_hook(&hook); 2116 return -ENOMEM; 2117 } 2118 chain = &basechain->chain; 2119 2120 if (nla[NFTA_CHAIN_COUNTERS]) { 2121 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); 2122 if (IS_ERR(stats)) { 2123 nft_chain_release_hook(&hook); 2124 kfree(basechain); 2125 return PTR_ERR(stats); 2126 } 2127 rcu_assign_pointer(basechain->stats, stats); 2128 static_branch_inc(&nft_counters_enabled); 2129 } 2130 2131 err = nft_basechain_init(basechain, family, &hook, flags); 2132 if (err < 0) { 2133 nft_chain_release_hook(&hook); 2134 kfree(basechain); 2135 return err; 2136 } 2137 } else { 2138 if (flags & NFT_CHAIN_BASE) 2139 return -EINVAL; 2140 if (flags & NFT_CHAIN_HW_OFFLOAD) 2141 return -EOPNOTSUPP; 2142 2143 chain = kzalloc(sizeof(*chain), GFP_KERNEL); 2144 if (chain == NULL) 2145 return -ENOMEM; 2146 2147 chain->flags = flags; 2148 } 2149 ctx->chain = chain; 2150 2151 INIT_LIST_HEAD(&chain->rules); 2152 chain->handle = nf_tables_alloc_handle(table); 2153 chain->table = table; 2154 2155 if (nla[NFTA_CHAIN_NAME]) { 2156 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); 2157 } else { 2158 if (!(flags & NFT_CHAIN_BINDING)) { 2159 err = -EINVAL; 2160 goto err_destroy_chain; 2161 } 2162 2163 snprintf(name, sizeof(name), "__chain%llu", ++chain_id); 2164 chain->name = kstrdup(name, GFP_KERNEL); 2165 } 2166 2167 if (!chain->name) { 2168 err = -ENOMEM; 2169 goto err_destroy_chain; 2170 } 2171 2172 if (nla[NFTA_CHAIN_USERDATA]) { 2173 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL); 2174 if (chain->udata == NULL) { 2175 err = -ENOMEM; 2176 goto err_destroy_chain; 2177 } 2178 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]); 2179 } 2180 2181 rules = nf_tables_chain_alloc_rules(chain, 0); 2182 if (!rules) { 2183 err = -ENOMEM; 2184 goto err_destroy_chain; 2185 } 2186 2187 *rules = NULL; 2188 rcu_assign_pointer(chain->rules_gen_0, rules); 2189 rcu_assign_pointer(chain->rules_gen_1, rules); 2190 2191 err = nf_tables_register_hook(net, table, chain); 2192 if (err < 0) 2193 goto err_destroy_chain; 2194 2195 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); 2196 if (IS_ERR(trans)) { 2197 err = PTR_ERR(trans); 2198 goto err_unregister_hook; 2199 } 2200 2201 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET; 2202 if (nft_is_base_chain(chain)) 2203 nft_trans_chain_policy(trans) = policy; 2204 2205 err = nft_chain_add(table, chain); 2206 if (err < 0) { 2207 nft_trans_destroy(trans); 2208 goto err_unregister_hook; 2209 } 2210 2211 table->use++; 2212 2213 return 0; 2214 err_unregister_hook: 2215 nf_tables_unregister_hook(net, table, chain); 2216 err_destroy_chain: 2217 nf_tables_chain_destroy(ctx); 2218 2219 return err; 2220 } 2221 2222 static bool nft_hook_list_equal(struct list_head *hook_list1, 2223 struct list_head *hook_list2) 2224 { 2225 struct nft_hook *hook; 2226 int n = 0, m = 0; 2227 2228 n = 0; 2229 list_for_each_entry(hook, hook_list2, list) { 2230 if (!nft_hook_list_find(hook_list1, hook)) 2231 return false; 2232 2233 n++; 2234 } 2235 list_for_each_entry(hook, hook_list1, list) 2236 m++; 2237 2238 return n == m; 2239 } 2240 2241 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, 2242 u32 flags, const struct nlattr *attr, 2243 struct netlink_ext_ack *extack) 2244 { 2245 const struct nlattr * const *nla = ctx->nla; 2246 struct nft_table *table = ctx->table; 2247 struct nft_chain *chain = ctx->chain; 2248 struct nft_base_chain *basechain; 2249 struct nft_stats *stats = NULL; 2250 struct nft_chain_hook hook; 2251 struct nf_hook_ops *ops; 2252 struct nft_trans *trans; 2253 int err; 2254 2255 if (chain->flags ^ flags) 2256 return -EOPNOTSUPP; 2257 2258 if (nla[NFTA_CHAIN_HOOK]) { 2259 if (!nft_is_base_chain(chain)) { 2260 NL_SET_BAD_ATTR(extack, attr); 2261 return -EEXIST; 2262 } 2263 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family, 2264 extack, false); 2265 if (err < 0) 2266 return err; 2267 2268 basechain = nft_base_chain(chain); 2269 if (basechain->type != hook.type) { 2270 nft_chain_release_hook(&hook); 2271 NL_SET_BAD_ATTR(extack, attr); 2272 return -EEXIST; 2273 } 2274 2275 if (nft_base_chain_netdev(ctx->family, hook.num)) { 2276 if (!nft_hook_list_equal(&basechain->hook_list, 2277 &hook.list)) { 2278 nft_chain_release_hook(&hook); 2279 NL_SET_BAD_ATTR(extack, attr); 2280 return -EEXIST; 2281 } 2282 } else { 2283 ops = &basechain->ops; 2284 if (ops->hooknum != hook.num || 2285 ops->priority != hook.priority) { 2286 nft_chain_release_hook(&hook); 2287 NL_SET_BAD_ATTR(extack, attr); 2288 return -EEXIST; 2289 } 2290 } 2291 nft_chain_release_hook(&hook); 2292 } 2293 2294 if (nla[NFTA_CHAIN_HANDLE] && 2295 nla[NFTA_CHAIN_NAME]) { 2296 struct nft_chain *chain2; 2297 2298 chain2 = nft_chain_lookup(ctx->net, table, 2299 nla[NFTA_CHAIN_NAME], genmask); 2300 if (!IS_ERR(chain2)) { 2301 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 2302 return -EEXIST; 2303 } 2304 } 2305 2306 if (nla[NFTA_CHAIN_COUNTERS]) { 2307 if (!nft_is_base_chain(chain)) 2308 return -EOPNOTSUPP; 2309 2310 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); 2311 if (IS_ERR(stats)) 2312 return PTR_ERR(stats); 2313 } 2314 2315 err = -ENOMEM; 2316 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, 2317 sizeof(struct nft_trans_chain)); 2318 if (trans == NULL) 2319 goto err; 2320 2321 nft_trans_chain_stats(trans) = stats; 2322 nft_trans_chain_update(trans) = true; 2323 2324 if (nla[NFTA_CHAIN_POLICY]) 2325 nft_trans_chain_policy(trans) = policy; 2326 else 2327 nft_trans_chain_policy(trans) = -1; 2328 2329 if (nla[NFTA_CHAIN_HANDLE] && 2330 nla[NFTA_CHAIN_NAME]) { 2331 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 2332 struct nft_trans *tmp; 2333 char *name; 2334 2335 err = -ENOMEM; 2336 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL); 2337 if (!name) 2338 goto err; 2339 2340 err = -EEXIST; 2341 list_for_each_entry(tmp, &nft_net->commit_list, list) { 2342 if (tmp->msg_type == NFT_MSG_NEWCHAIN && 2343 tmp->ctx.table == table && 2344 nft_trans_chain_update(tmp) && 2345 nft_trans_chain_name(tmp) && 2346 strcmp(name, nft_trans_chain_name(tmp)) == 0) { 2347 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 2348 kfree(name); 2349 goto err; 2350 } 2351 } 2352 2353 nft_trans_chain_name(trans) = name; 2354 } 2355 nft_trans_commit_list_add_tail(ctx->net, trans); 2356 2357 return 0; 2358 err: 2359 free_percpu(stats); 2360 kfree(trans); 2361 return err; 2362 } 2363 2364 static struct nft_chain *nft_chain_lookup_byid(const struct net *net, 2365 const struct nlattr *nla) 2366 { 2367 struct nftables_pernet *nft_net = nft_pernet(net); 2368 u32 id = ntohl(nla_get_be32(nla)); 2369 struct nft_trans *trans; 2370 2371 list_for_each_entry(trans, &nft_net->commit_list, list) { 2372 struct nft_chain *chain = trans->ctx.chain; 2373 2374 if (trans->msg_type == NFT_MSG_NEWCHAIN && 2375 id == nft_trans_chain_id(trans)) 2376 return chain; 2377 } 2378 return ERR_PTR(-ENOENT); 2379 } 2380 2381 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info, 2382 const struct nlattr * const nla[]) 2383 { 2384 struct nftables_pernet *nft_net = nft_pernet(info->net); 2385 struct netlink_ext_ack *extack = info->extack; 2386 u8 genmask = nft_genmask_next(info->net); 2387 u8 family = info->nfmsg->nfgen_family; 2388 struct nft_chain *chain = NULL; 2389 struct net *net = info->net; 2390 const struct nlattr *attr; 2391 struct nft_table *table; 2392 u8 policy = NF_ACCEPT; 2393 struct nft_ctx ctx; 2394 u64 handle = 0; 2395 u32 flags = 0; 2396 2397 lockdep_assert_held(&nft_net->commit_mutex); 2398 2399 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 2400 NETLINK_CB(skb).portid); 2401 if (IS_ERR(table)) { 2402 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 2403 return PTR_ERR(table); 2404 } 2405 2406 chain = NULL; 2407 attr = nla[NFTA_CHAIN_NAME]; 2408 2409 if (nla[NFTA_CHAIN_HANDLE]) { 2410 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); 2411 chain = nft_chain_lookup_byhandle(table, handle, genmask); 2412 if (IS_ERR(chain)) { 2413 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]); 2414 return PTR_ERR(chain); 2415 } 2416 attr = nla[NFTA_CHAIN_HANDLE]; 2417 } else if (nla[NFTA_CHAIN_NAME]) { 2418 chain = nft_chain_lookup(net, table, attr, genmask); 2419 if (IS_ERR(chain)) { 2420 if (PTR_ERR(chain) != -ENOENT) { 2421 NL_SET_BAD_ATTR(extack, attr); 2422 return PTR_ERR(chain); 2423 } 2424 chain = NULL; 2425 } 2426 } else if (!nla[NFTA_CHAIN_ID]) { 2427 return -EINVAL; 2428 } 2429 2430 if (nla[NFTA_CHAIN_POLICY]) { 2431 if (chain != NULL && 2432 !nft_is_base_chain(chain)) { 2433 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); 2434 return -EOPNOTSUPP; 2435 } 2436 2437 if (chain == NULL && 2438 nla[NFTA_CHAIN_HOOK] == NULL) { 2439 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); 2440 return -EOPNOTSUPP; 2441 } 2442 2443 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); 2444 switch (policy) { 2445 case NF_DROP: 2446 case NF_ACCEPT: 2447 break; 2448 default: 2449 return -EINVAL; 2450 } 2451 } 2452 2453 if (nla[NFTA_CHAIN_FLAGS]) 2454 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS])); 2455 else if (chain) 2456 flags = chain->flags; 2457 2458 if (flags & ~NFT_CHAIN_FLAGS) 2459 return -EOPNOTSUPP; 2460 2461 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 2462 2463 if (chain != NULL) { 2464 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 2465 NL_SET_BAD_ATTR(extack, attr); 2466 return -EEXIST; 2467 } 2468 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 2469 return -EOPNOTSUPP; 2470 2471 flags |= chain->flags & NFT_CHAIN_BASE; 2472 return nf_tables_updchain(&ctx, genmask, policy, flags, attr, 2473 extack); 2474 } 2475 2476 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack); 2477 } 2478 2479 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info, 2480 const struct nlattr * const nla[]) 2481 { 2482 struct netlink_ext_ack *extack = info->extack; 2483 u8 genmask = nft_genmask_next(info->net); 2484 u8 family = info->nfmsg->nfgen_family; 2485 struct net *net = info->net; 2486 const struct nlattr *attr; 2487 struct nft_table *table; 2488 struct nft_chain *chain; 2489 struct nft_rule *rule; 2490 struct nft_ctx ctx; 2491 u64 handle; 2492 u32 use; 2493 int err; 2494 2495 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 2496 NETLINK_CB(skb).portid); 2497 if (IS_ERR(table)) { 2498 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 2499 return PTR_ERR(table); 2500 } 2501 2502 if (nla[NFTA_CHAIN_HANDLE]) { 2503 attr = nla[NFTA_CHAIN_HANDLE]; 2504 handle = be64_to_cpu(nla_get_be64(attr)); 2505 chain = nft_chain_lookup_byhandle(table, handle, genmask); 2506 } else { 2507 attr = nla[NFTA_CHAIN_NAME]; 2508 chain = nft_chain_lookup(net, table, attr, genmask); 2509 } 2510 if (IS_ERR(chain)) { 2511 NL_SET_BAD_ATTR(extack, attr); 2512 return PTR_ERR(chain); 2513 } 2514 2515 if (info->nlh->nlmsg_flags & NLM_F_NONREC && 2516 chain->use > 0) 2517 return -EBUSY; 2518 2519 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 2520 2521 use = chain->use; 2522 list_for_each_entry(rule, &chain->rules, list) { 2523 if (!nft_is_active_next(net, rule)) 2524 continue; 2525 use--; 2526 2527 err = nft_delrule(&ctx, rule); 2528 if (err < 0) 2529 return err; 2530 } 2531 2532 /* There are rules and elements that are still holding references to us, 2533 * we cannot do a recursive removal in this case. 2534 */ 2535 if (use > 0) { 2536 NL_SET_BAD_ATTR(extack, attr); 2537 return -EBUSY; 2538 } 2539 2540 return nft_delchain(&ctx); 2541 } 2542 2543 /* 2544 * Expressions 2545 */ 2546 2547 /** 2548 * nft_register_expr - register nf_tables expr type 2549 * @type: expr type 2550 * 2551 * Registers the expr type for use with nf_tables. Returns zero on 2552 * success or a negative errno code otherwise. 2553 */ 2554 int nft_register_expr(struct nft_expr_type *type) 2555 { 2556 nfnl_lock(NFNL_SUBSYS_NFTABLES); 2557 if (type->family == NFPROTO_UNSPEC) 2558 list_add_tail_rcu(&type->list, &nf_tables_expressions); 2559 else 2560 list_add_rcu(&type->list, &nf_tables_expressions); 2561 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 2562 return 0; 2563 } 2564 EXPORT_SYMBOL_GPL(nft_register_expr); 2565 2566 /** 2567 * nft_unregister_expr - unregister nf_tables expr type 2568 * @type: expr type 2569 * 2570 * Unregisters the expr typefor use with nf_tables. 2571 */ 2572 void nft_unregister_expr(struct nft_expr_type *type) 2573 { 2574 nfnl_lock(NFNL_SUBSYS_NFTABLES); 2575 list_del_rcu(&type->list); 2576 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 2577 } 2578 EXPORT_SYMBOL_GPL(nft_unregister_expr); 2579 2580 static const struct nft_expr_type *__nft_expr_type_get(u8 family, 2581 struct nlattr *nla) 2582 { 2583 const struct nft_expr_type *type, *candidate = NULL; 2584 2585 list_for_each_entry(type, &nf_tables_expressions, list) { 2586 if (!nla_strcmp(nla, type->name)) { 2587 if (!type->family && !candidate) 2588 candidate = type; 2589 else if (type->family == family) 2590 candidate = type; 2591 } 2592 } 2593 return candidate; 2594 } 2595 2596 #ifdef CONFIG_MODULES 2597 static int nft_expr_type_request_module(struct net *net, u8 family, 2598 struct nlattr *nla) 2599 { 2600 if (nft_request_module(net, "nft-expr-%u-%.*s", family, 2601 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN) 2602 return -EAGAIN; 2603 2604 return 0; 2605 } 2606 #endif 2607 2608 static const struct nft_expr_type *nft_expr_type_get(struct net *net, 2609 u8 family, 2610 struct nlattr *nla) 2611 { 2612 const struct nft_expr_type *type; 2613 2614 if (nla == NULL) 2615 return ERR_PTR(-EINVAL); 2616 2617 type = __nft_expr_type_get(family, nla); 2618 if (type != NULL && try_module_get(type->owner)) 2619 return type; 2620 2621 lockdep_nfnl_nft_mutex_not_held(); 2622 #ifdef CONFIG_MODULES 2623 if (type == NULL) { 2624 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN) 2625 return ERR_PTR(-EAGAIN); 2626 2627 if (nft_request_module(net, "nft-expr-%.*s", 2628 nla_len(nla), 2629 (char *)nla_data(nla)) == -EAGAIN) 2630 return ERR_PTR(-EAGAIN); 2631 } 2632 #endif 2633 return ERR_PTR(-ENOENT); 2634 } 2635 2636 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { 2637 [NFTA_EXPR_NAME] = { .type = NLA_STRING, 2638 .len = NFT_MODULE_AUTOLOAD_LIMIT }, 2639 [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, 2640 }; 2641 2642 static int nf_tables_fill_expr_info(struct sk_buff *skb, 2643 const struct nft_expr *expr) 2644 { 2645 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) 2646 goto nla_put_failure; 2647 2648 if (expr->ops->dump) { 2649 struct nlattr *data = nla_nest_start_noflag(skb, 2650 NFTA_EXPR_DATA); 2651 if (data == NULL) 2652 goto nla_put_failure; 2653 if (expr->ops->dump(skb, expr) < 0) 2654 goto nla_put_failure; 2655 nla_nest_end(skb, data); 2656 } 2657 2658 return skb->len; 2659 2660 nla_put_failure: 2661 return -1; 2662 }; 2663 2664 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 2665 const struct nft_expr *expr) 2666 { 2667 struct nlattr *nest; 2668 2669 nest = nla_nest_start_noflag(skb, attr); 2670 if (!nest) 2671 goto nla_put_failure; 2672 if (nf_tables_fill_expr_info(skb, expr) < 0) 2673 goto nla_put_failure; 2674 nla_nest_end(skb, nest); 2675 return 0; 2676 2677 nla_put_failure: 2678 return -1; 2679 } 2680 2681 struct nft_expr_info { 2682 const struct nft_expr_ops *ops; 2683 const struct nlattr *attr; 2684 struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; 2685 }; 2686 2687 static int nf_tables_expr_parse(const struct nft_ctx *ctx, 2688 const struct nlattr *nla, 2689 struct nft_expr_info *info) 2690 { 2691 const struct nft_expr_type *type; 2692 const struct nft_expr_ops *ops; 2693 struct nlattr *tb[NFTA_EXPR_MAX + 1]; 2694 int err; 2695 2696 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla, 2697 nft_expr_policy, NULL); 2698 if (err < 0) 2699 return err; 2700 2701 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]); 2702 if (IS_ERR(type)) 2703 return PTR_ERR(type); 2704 2705 if (tb[NFTA_EXPR_DATA]) { 2706 err = nla_parse_nested_deprecated(info->tb, type->maxattr, 2707 tb[NFTA_EXPR_DATA], 2708 type->policy, NULL); 2709 if (err < 0) 2710 goto err1; 2711 } else 2712 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); 2713 2714 if (type->select_ops != NULL) { 2715 ops = type->select_ops(ctx, 2716 (const struct nlattr * const *)info->tb); 2717 if (IS_ERR(ops)) { 2718 err = PTR_ERR(ops); 2719 #ifdef CONFIG_MODULES 2720 if (err == -EAGAIN) 2721 if (nft_expr_type_request_module(ctx->net, 2722 ctx->family, 2723 tb[NFTA_EXPR_NAME]) != -EAGAIN) 2724 err = -ENOENT; 2725 #endif 2726 goto err1; 2727 } 2728 } else 2729 ops = type->ops; 2730 2731 info->attr = nla; 2732 info->ops = ops; 2733 2734 return 0; 2735 2736 err1: 2737 module_put(type->owner); 2738 return err; 2739 } 2740 2741 static int nf_tables_newexpr(const struct nft_ctx *ctx, 2742 const struct nft_expr_info *expr_info, 2743 struct nft_expr *expr) 2744 { 2745 const struct nft_expr_ops *ops = expr_info->ops; 2746 int err; 2747 2748 expr->ops = ops; 2749 if (ops->init) { 2750 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb); 2751 if (err < 0) 2752 goto err1; 2753 } 2754 2755 return 0; 2756 err1: 2757 expr->ops = NULL; 2758 return err; 2759 } 2760 2761 static void nf_tables_expr_destroy(const struct nft_ctx *ctx, 2762 struct nft_expr *expr) 2763 { 2764 const struct nft_expr_type *type = expr->ops->type; 2765 2766 if (expr->ops->destroy) 2767 expr->ops->destroy(ctx, expr); 2768 module_put(type->owner); 2769 } 2770 2771 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, 2772 const struct nlattr *nla) 2773 { 2774 struct nft_expr_info expr_info; 2775 struct nft_expr *expr; 2776 struct module *owner; 2777 int err; 2778 2779 err = nf_tables_expr_parse(ctx, nla, &expr_info); 2780 if (err < 0) 2781 goto err1; 2782 2783 err = -ENOMEM; 2784 expr = kzalloc(expr_info.ops->size, GFP_KERNEL); 2785 if (expr == NULL) 2786 goto err2; 2787 2788 err = nf_tables_newexpr(ctx, &expr_info, expr); 2789 if (err < 0) 2790 goto err3; 2791 2792 return expr; 2793 err3: 2794 kfree(expr); 2795 err2: 2796 owner = expr_info.ops->type->owner; 2797 if (expr_info.ops->type->release_ops) 2798 expr_info.ops->type->release_ops(expr_info.ops); 2799 2800 module_put(owner); 2801 err1: 2802 return ERR_PTR(err); 2803 } 2804 2805 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) 2806 { 2807 int err; 2808 2809 if (src->ops->clone) { 2810 dst->ops = src->ops; 2811 err = src->ops->clone(dst, src); 2812 if (err < 0) 2813 return err; 2814 } else { 2815 memcpy(dst, src, src->ops->size); 2816 } 2817 2818 __module_get(src->ops->type->owner); 2819 2820 return 0; 2821 } 2822 2823 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) 2824 { 2825 nf_tables_expr_destroy(ctx, expr); 2826 kfree(expr); 2827 } 2828 2829 /* 2830 * Rules 2831 */ 2832 2833 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain, 2834 u64 handle) 2835 { 2836 struct nft_rule *rule; 2837 2838 // FIXME: this sucks 2839 list_for_each_entry_rcu(rule, &chain->rules, list) { 2840 if (handle == rule->handle) 2841 return rule; 2842 } 2843 2844 return ERR_PTR(-ENOENT); 2845 } 2846 2847 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain, 2848 const struct nlattr *nla) 2849 { 2850 if (nla == NULL) 2851 return ERR_PTR(-EINVAL); 2852 2853 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); 2854 } 2855 2856 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { 2857 [NFTA_RULE_TABLE] = { .type = NLA_STRING, 2858 .len = NFT_TABLE_MAXNAMELEN - 1 }, 2859 [NFTA_RULE_CHAIN] = { .type = NLA_STRING, 2860 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 2861 [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, 2862 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, 2863 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, 2864 [NFTA_RULE_POSITION] = { .type = NLA_U64 }, 2865 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, 2866 .len = NFT_USERDATA_MAXLEN }, 2867 [NFTA_RULE_ID] = { .type = NLA_U32 }, 2868 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 }, 2869 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 }, 2870 }; 2871 2872 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, 2873 u32 portid, u32 seq, int event, 2874 u32 flags, int family, 2875 const struct nft_table *table, 2876 const struct nft_chain *chain, 2877 const struct nft_rule *rule, u64 handle) 2878 { 2879 struct nlmsghdr *nlh; 2880 const struct nft_expr *expr, *next; 2881 struct nlattr *list; 2882 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 2883 2884 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0, 2885 nft_base_seq(net)); 2886 if (!nlh) 2887 goto nla_put_failure; 2888 2889 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) 2890 goto nla_put_failure; 2891 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) 2892 goto nla_put_failure; 2893 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), 2894 NFTA_RULE_PAD)) 2895 goto nla_put_failure; 2896 2897 if (event != NFT_MSG_DELRULE && handle) { 2898 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle), 2899 NFTA_RULE_PAD)) 2900 goto nla_put_failure; 2901 } 2902 2903 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) 2904 nft_flow_rule_stats(chain, rule); 2905 2906 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS); 2907 if (list == NULL) 2908 goto nla_put_failure; 2909 nft_rule_for_each_expr(expr, next, rule) { 2910 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) 2911 goto nla_put_failure; 2912 } 2913 nla_nest_end(skb, list); 2914 2915 if (rule->udata) { 2916 struct nft_userdata *udata = nft_userdata(rule); 2917 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, 2918 udata->data) < 0) 2919 goto nla_put_failure; 2920 } 2921 2922 nlmsg_end(skb, nlh); 2923 return 0; 2924 2925 nla_put_failure: 2926 nlmsg_trim(skb, nlh); 2927 return -1; 2928 } 2929 2930 static void nf_tables_rule_notify(const struct nft_ctx *ctx, 2931 const struct nft_rule *rule, int event) 2932 { 2933 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 2934 const struct nft_rule *prule; 2935 struct sk_buff *skb; 2936 u64 handle = 0; 2937 u16 flags = 0; 2938 int err; 2939 2940 if (!ctx->report && 2941 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 2942 return; 2943 2944 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 2945 if (skb == NULL) 2946 goto err; 2947 2948 if (event == NFT_MSG_NEWRULE && 2949 !list_is_first(&rule->list, &ctx->chain->rules) && 2950 !list_is_last(&rule->list, &ctx->chain->rules)) { 2951 prule = list_prev_entry(rule, list); 2952 handle = prule->handle; 2953 } 2954 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE)) 2955 flags |= NLM_F_APPEND; 2956 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 2957 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 2958 2959 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, 2960 event, flags, ctx->family, ctx->table, 2961 ctx->chain, rule, handle); 2962 if (err < 0) { 2963 kfree_skb(skb); 2964 goto err; 2965 } 2966 2967 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 2968 return; 2969 err: 2970 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 2971 } 2972 2973 struct nft_rule_dump_ctx { 2974 char *table; 2975 char *chain; 2976 }; 2977 2978 static int __nf_tables_dump_rules(struct sk_buff *skb, 2979 unsigned int *idx, 2980 struct netlink_callback *cb, 2981 const struct nft_table *table, 2982 const struct nft_chain *chain) 2983 { 2984 struct net *net = sock_net(skb->sk); 2985 const struct nft_rule *rule, *prule; 2986 unsigned int s_idx = cb->args[0]; 2987 u64 handle; 2988 2989 prule = NULL; 2990 list_for_each_entry_rcu(rule, &chain->rules, list) { 2991 if (!nft_is_active(net, rule)) 2992 goto cont_skip; 2993 if (*idx < s_idx) 2994 goto cont; 2995 if (*idx > s_idx) { 2996 memset(&cb->args[1], 0, 2997 sizeof(cb->args) - sizeof(cb->args[0])); 2998 } 2999 if (prule) 3000 handle = prule->handle; 3001 else 3002 handle = 0; 3003 3004 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, 3005 cb->nlh->nlmsg_seq, 3006 NFT_MSG_NEWRULE, 3007 NLM_F_MULTI | NLM_F_APPEND, 3008 table->family, 3009 table, chain, rule, handle) < 0) 3010 return 1; 3011 3012 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3013 cont: 3014 prule = rule; 3015 cont_skip: 3016 (*idx)++; 3017 } 3018 return 0; 3019 } 3020 3021 static int nf_tables_dump_rules(struct sk_buff *skb, 3022 struct netlink_callback *cb) 3023 { 3024 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 3025 const struct nft_rule_dump_ctx *ctx = cb->data; 3026 struct nft_table *table; 3027 const struct nft_chain *chain; 3028 unsigned int idx = 0; 3029 struct net *net = sock_net(skb->sk); 3030 int family = nfmsg->nfgen_family; 3031 struct nftables_pernet *nft_net; 3032 3033 rcu_read_lock(); 3034 nft_net = nft_pernet(net); 3035 cb->seq = nft_net->base_seq; 3036 3037 list_for_each_entry_rcu(table, &nft_net->tables, list) { 3038 if (family != NFPROTO_UNSPEC && family != table->family) 3039 continue; 3040 3041 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0) 3042 continue; 3043 3044 if (ctx && ctx->table && ctx->chain) { 3045 struct rhlist_head *list, *tmp; 3046 3047 list = rhltable_lookup(&table->chains_ht, ctx->chain, 3048 nft_chain_ht_params); 3049 if (!list) 3050 goto done; 3051 3052 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { 3053 if (!nft_is_active(net, chain)) 3054 continue; 3055 __nf_tables_dump_rules(skb, &idx, 3056 cb, table, chain); 3057 break; 3058 } 3059 goto done; 3060 } 3061 3062 list_for_each_entry_rcu(chain, &table->chains, list) { 3063 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain)) 3064 goto done; 3065 } 3066 3067 if (ctx && ctx->table) 3068 break; 3069 } 3070 done: 3071 rcu_read_unlock(); 3072 3073 cb->args[0] = idx; 3074 return skb->len; 3075 } 3076 3077 static int nf_tables_dump_rules_start(struct netlink_callback *cb) 3078 { 3079 const struct nlattr * const *nla = cb->data; 3080 struct nft_rule_dump_ctx *ctx = NULL; 3081 3082 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { 3083 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 3084 if (!ctx) 3085 return -ENOMEM; 3086 3087 if (nla[NFTA_RULE_TABLE]) { 3088 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], 3089 GFP_ATOMIC); 3090 if (!ctx->table) { 3091 kfree(ctx); 3092 return -ENOMEM; 3093 } 3094 } 3095 if (nla[NFTA_RULE_CHAIN]) { 3096 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], 3097 GFP_ATOMIC); 3098 if (!ctx->chain) { 3099 kfree(ctx->table); 3100 kfree(ctx); 3101 return -ENOMEM; 3102 } 3103 } 3104 } 3105 3106 cb->data = ctx; 3107 return 0; 3108 } 3109 3110 static int nf_tables_dump_rules_done(struct netlink_callback *cb) 3111 { 3112 struct nft_rule_dump_ctx *ctx = cb->data; 3113 3114 if (ctx) { 3115 kfree(ctx->table); 3116 kfree(ctx->chain); 3117 kfree(ctx); 3118 } 3119 return 0; 3120 } 3121 3122 /* called with rcu_read_lock held */ 3123 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info, 3124 const struct nlattr * const nla[]) 3125 { 3126 struct netlink_ext_ack *extack = info->extack; 3127 u8 genmask = nft_genmask_cur(info->net); 3128 u8 family = info->nfmsg->nfgen_family; 3129 const struct nft_chain *chain; 3130 const struct nft_rule *rule; 3131 struct net *net = info->net; 3132 struct nft_table *table; 3133 struct sk_buff *skb2; 3134 int err; 3135 3136 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 3137 struct netlink_dump_control c = { 3138 .start= nf_tables_dump_rules_start, 3139 .dump = nf_tables_dump_rules, 3140 .done = nf_tables_dump_rules_done, 3141 .module = THIS_MODULE, 3142 .data = (void *)nla, 3143 }; 3144 3145 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 3146 } 3147 3148 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0); 3149 if (IS_ERR(table)) { 3150 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3151 return PTR_ERR(table); 3152 } 3153 3154 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask); 3155 if (IS_ERR(chain)) { 3156 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3157 return PTR_ERR(chain); 3158 } 3159 3160 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); 3161 if (IS_ERR(rule)) { 3162 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3163 return PTR_ERR(rule); 3164 } 3165 3166 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 3167 if (!skb2) 3168 return -ENOMEM; 3169 3170 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, 3171 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, 3172 family, table, chain, rule, 0); 3173 if (err < 0) 3174 goto err_fill_rule_info; 3175 3176 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 3177 3178 err_fill_rule_info: 3179 kfree_skb(skb2); 3180 return err; 3181 } 3182 3183 static void nf_tables_rule_destroy(const struct nft_ctx *ctx, 3184 struct nft_rule *rule) 3185 { 3186 struct nft_expr *expr, *next; 3187 3188 /* 3189 * Careful: some expressions might not be initialized in case this 3190 * is called on error from nf_tables_newrule(). 3191 */ 3192 expr = nft_expr_first(rule); 3193 while (nft_expr_more(rule, expr)) { 3194 next = nft_expr_next(expr); 3195 nf_tables_expr_destroy(ctx, expr); 3196 expr = next; 3197 } 3198 kfree(rule); 3199 } 3200 3201 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule) 3202 { 3203 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE); 3204 nf_tables_rule_destroy(ctx, rule); 3205 } 3206 3207 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain) 3208 { 3209 struct nft_expr *expr, *last; 3210 const struct nft_data *data; 3211 struct nft_rule *rule; 3212 int err; 3213 3214 if (ctx->level == NFT_JUMP_STACK_SIZE) 3215 return -EMLINK; 3216 3217 list_for_each_entry(rule, &chain->rules, list) { 3218 if (!nft_is_active_next(ctx->net, rule)) 3219 continue; 3220 3221 nft_rule_for_each_expr(expr, last, rule) { 3222 if (!expr->ops->validate) 3223 continue; 3224 3225 err = expr->ops->validate(ctx, expr, &data); 3226 if (err < 0) 3227 return err; 3228 } 3229 } 3230 3231 return 0; 3232 } 3233 EXPORT_SYMBOL_GPL(nft_chain_validate); 3234 3235 static int nft_table_validate(struct net *net, const struct nft_table *table) 3236 { 3237 struct nft_chain *chain; 3238 struct nft_ctx ctx = { 3239 .net = net, 3240 .family = table->family, 3241 }; 3242 int err; 3243 3244 list_for_each_entry(chain, &table->chains, list) { 3245 if (!nft_is_base_chain(chain)) 3246 continue; 3247 3248 ctx.chain = chain; 3249 err = nft_chain_validate(&ctx, chain); 3250 if (err < 0) 3251 return err; 3252 } 3253 3254 return 0; 3255 } 3256 3257 static struct nft_rule *nft_rule_lookup_byid(const struct net *net, 3258 const struct nlattr *nla); 3259 3260 #define NFT_RULE_MAXEXPRS 128 3261 3262 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info, 3263 const struct nlattr * const nla[]) 3264 { 3265 struct nftables_pernet *nft_net = nft_pernet(info->net); 3266 struct netlink_ext_ack *extack = info->extack; 3267 unsigned int size, i, n, ulen = 0, usize = 0; 3268 u8 genmask = nft_genmask_next(info->net); 3269 struct nft_rule *rule, *old_rule = NULL; 3270 struct nft_expr_info *expr_info = NULL; 3271 u8 family = info->nfmsg->nfgen_family; 3272 struct nft_flow_rule *flow = NULL; 3273 struct net *net = info->net; 3274 struct nft_userdata *udata; 3275 struct nft_table *table; 3276 struct nft_chain *chain; 3277 struct nft_trans *trans; 3278 u64 handle, pos_handle; 3279 struct nft_expr *expr; 3280 struct nft_ctx ctx; 3281 struct nlattr *tmp; 3282 int err, rem; 3283 3284 lockdep_assert_held(&nft_net->commit_mutex); 3285 3286 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 3287 NETLINK_CB(skb).portid); 3288 if (IS_ERR(table)) { 3289 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3290 return PTR_ERR(table); 3291 } 3292 3293 if (nla[NFTA_RULE_CHAIN]) { 3294 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], 3295 genmask); 3296 if (IS_ERR(chain)) { 3297 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3298 return PTR_ERR(chain); 3299 } 3300 if (nft_chain_is_bound(chain)) 3301 return -EOPNOTSUPP; 3302 3303 } else if (nla[NFTA_RULE_CHAIN_ID]) { 3304 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]); 3305 if (IS_ERR(chain)) { 3306 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]); 3307 return PTR_ERR(chain); 3308 } 3309 } else { 3310 return -EINVAL; 3311 } 3312 3313 if (nla[NFTA_RULE_HANDLE]) { 3314 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); 3315 rule = __nft_rule_lookup(chain, handle); 3316 if (IS_ERR(rule)) { 3317 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3318 return PTR_ERR(rule); 3319 } 3320 3321 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 3322 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3323 return -EEXIST; 3324 } 3325 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 3326 old_rule = rule; 3327 else 3328 return -EOPNOTSUPP; 3329 } else { 3330 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) || 3331 info->nlh->nlmsg_flags & NLM_F_REPLACE) 3332 return -EINVAL; 3333 handle = nf_tables_alloc_handle(table); 3334 3335 if (chain->use == UINT_MAX) 3336 return -EOVERFLOW; 3337 3338 if (nla[NFTA_RULE_POSITION]) { 3339 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); 3340 old_rule = __nft_rule_lookup(chain, pos_handle); 3341 if (IS_ERR(old_rule)) { 3342 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); 3343 return PTR_ERR(old_rule); 3344 } 3345 } else if (nla[NFTA_RULE_POSITION_ID]) { 3346 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]); 3347 if (IS_ERR(old_rule)) { 3348 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]); 3349 return PTR_ERR(old_rule); 3350 } 3351 } 3352 } 3353 3354 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 3355 3356 n = 0; 3357 size = 0; 3358 if (nla[NFTA_RULE_EXPRESSIONS]) { 3359 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS, 3360 sizeof(struct nft_expr_info), 3361 GFP_KERNEL); 3362 if (!expr_info) 3363 return -ENOMEM; 3364 3365 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { 3366 err = -EINVAL; 3367 if (nla_type(tmp) != NFTA_LIST_ELEM) 3368 goto err_release_expr; 3369 if (n == NFT_RULE_MAXEXPRS) 3370 goto err_release_expr; 3371 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]); 3372 if (err < 0) { 3373 NL_SET_BAD_ATTR(extack, tmp); 3374 goto err_release_expr; 3375 } 3376 size += expr_info[n].ops->size; 3377 n++; 3378 } 3379 } 3380 /* Check for overflow of dlen field */ 3381 err = -EFBIG; 3382 if (size >= 1 << 12) 3383 goto err_release_expr; 3384 3385 if (nla[NFTA_RULE_USERDATA]) { 3386 ulen = nla_len(nla[NFTA_RULE_USERDATA]); 3387 if (ulen > 0) 3388 usize = sizeof(struct nft_userdata) + ulen; 3389 } 3390 3391 err = -ENOMEM; 3392 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL); 3393 if (rule == NULL) 3394 goto err_release_expr; 3395 3396 nft_activate_next(net, rule); 3397 3398 rule->handle = handle; 3399 rule->dlen = size; 3400 rule->udata = ulen ? 1 : 0; 3401 3402 if (ulen) { 3403 udata = nft_userdata(rule); 3404 udata->len = ulen - 1; 3405 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); 3406 } 3407 3408 expr = nft_expr_first(rule); 3409 for (i = 0; i < n; i++) { 3410 err = nf_tables_newexpr(&ctx, &expr_info[i], expr); 3411 if (err < 0) { 3412 NL_SET_BAD_ATTR(extack, expr_info[i].attr); 3413 goto err_release_rule; 3414 } 3415 3416 if (expr_info[i].ops->validate) 3417 nft_validate_state_update(net, NFT_VALIDATE_NEED); 3418 3419 expr_info[i].ops = NULL; 3420 expr = nft_expr_next(expr); 3421 } 3422 3423 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) { 3424 flow = nft_flow_rule_create(net, rule); 3425 if (IS_ERR(flow)) { 3426 err = PTR_ERR(flow); 3427 goto err_release_rule; 3428 } 3429 } 3430 3431 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) { 3432 err = nft_delrule(&ctx, old_rule); 3433 if (err < 0) 3434 goto err_destroy_flow_rule; 3435 3436 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); 3437 if (trans == NULL) { 3438 err = -ENOMEM; 3439 goto err_destroy_flow_rule; 3440 } 3441 list_add_tail_rcu(&rule->list, &old_rule->list); 3442 } else { 3443 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); 3444 if (!trans) { 3445 err = -ENOMEM; 3446 goto err_destroy_flow_rule; 3447 } 3448 3449 if (info->nlh->nlmsg_flags & NLM_F_APPEND) { 3450 if (old_rule) 3451 list_add_rcu(&rule->list, &old_rule->list); 3452 else 3453 list_add_tail_rcu(&rule->list, &chain->rules); 3454 } else { 3455 if (old_rule) 3456 list_add_tail_rcu(&rule->list, &old_rule->list); 3457 else 3458 list_add_rcu(&rule->list, &chain->rules); 3459 } 3460 } 3461 kvfree(expr_info); 3462 chain->use++; 3463 3464 if (flow) 3465 nft_trans_flow_rule(trans) = flow; 3466 3467 if (nft_net->validate_state == NFT_VALIDATE_DO) 3468 return nft_table_validate(net, table); 3469 3470 return 0; 3471 3472 err_destroy_flow_rule: 3473 if (flow) 3474 nft_flow_rule_destroy(flow); 3475 err_release_rule: 3476 nf_tables_rule_release(&ctx, rule); 3477 err_release_expr: 3478 for (i = 0; i < n; i++) { 3479 if (expr_info[i].ops) { 3480 module_put(expr_info[i].ops->type->owner); 3481 if (expr_info[i].ops->type->release_ops) 3482 expr_info[i].ops->type->release_ops(expr_info[i].ops); 3483 } 3484 } 3485 kvfree(expr_info); 3486 3487 return err; 3488 } 3489 3490 static struct nft_rule *nft_rule_lookup_byid(const struct net *net, 3491 const struct nlattr *nla) 3492 { 3493 struct nftables_pernet *nft_net = nft_pernet(net); 3494 u32 id = ntohl(nla_get_be32(nla)); 3495 struct nft_trans *trans; 3496 3497 list_for_each_entry(trans, &nft_net->commit_list, list) { 3498 struct nft_rule *rule = nft_trans_rule(trans); 3499 3500 if (trans->msg_type == NFT_MSG_NEWRULE && 3501 id == nft_trans_rule_id(trans)) 3502 return rule; 3503 } 3504 return ERR_PTR(-ENOENT); 3505 } 3506 3507 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info, 3508 const struct nlattr * const nla[]) 3509 { 3510 struct netlink_ext_ack *extack = info->extack; 3511 u8 genmask = nft_genmask_next(info->net); 3512 u8 family = info->nfmsg->nfgen_family; 3513 struct nft_chain *chain = NULL; 3514 struct net *net = info->net; 3515 struct nft_table *table; 3516 struct nft_rule *rule; 3517 struct nft_ctx ctx; 3518 int err = 0; 3519 3520 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 3521 NETLINK_CB(skb).portid); 3522 if (IS_ERR(table)) { 3523 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3524 return PTR_ERR(table); 3525 } 3526 3527 if (nla[NFTA_RULE_CHAIN]) { 3528 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], 3529 genmask); 3530 if (IS_ERR(chain)) { 3531 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3532 return PTR_ERR(chain); 3533 } 3534 if (nft_chain_is_bound(chain)) 3535 return -EOPNOTSUPP; 3536 } 3537 3538 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 3539 3540 if (chain) { 3541 if (nla[NFTA_RULE_HANDLE]) { 3542 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); 3543 if (IS_ERR(rule)) { 3544 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3545 return PTR_ERR(rule); 3546 } 3547 3548 err = nft_delrule(&ctx, rule); 3549 } else if (nla[NFTA_RULE_ID]) { 3550 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); 3551 if (IS_ERR(rule)) { 3552 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]); 3553 return PTR_ERR(rule); 3554 } 3555 3556 err = nft_delrule(&ctx, rule); 3557 } else { 3558 err = nft_delrule_by_chain(&ctx); 3559 } 3560 } else { 3561 list_for_each_entry(chain, &table->chains, list) { 3562 if (!nft_is_active_next(net, chain)) 3563 continue; 3564 3565 ctx.chain = chain; 3566 err = nft_delrule_by_chain(&ctx); 3567 if (err < 0) 3568 break; 3569 } 3570 } 3571 3572 return err; 3573 } 3574 3575 /* 3576 * Sets 3577 */ 3578 static const struct nft_set_type *nft_set_types[] = { 3579 &nft_set_hash_fast_type, 3580 &nft_set_hash_type, 3581 &nft_set_rhash_type, 3582 &nft_set_bitmap_type, 3583 &nft_set_rbtree_type, 3584 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML) 3585 &nft_set_pipapo_avx2_type, 3586 #endif 3587 &nft_set_pipapo_type, 3588 }; 3589 3590 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ 3591 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \ 3592 NFT_SET_EVAL) 3593 3594 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags) 3595 { 3596 return (flags & type->features) == (flags & NFT_SET_FEATURES); 3597 } 3598 3599 /* 3600 * Select a set implementation based on the data characteristics and the 3601 * given policy. The total memory use might not be known if no size is 3602 * given, in that case the amount of memory per element is used. 3603 */ 3604 static const struct nft_set_ops * 3605 nft_select_set_ops(const struct nft_ctx *ctx, 3606 const struct nlattr * const nla[], 3607 const struct nft_set_desc *desc, 3608 enum nft_set_policies policy) 3609 { 3610 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 3611 const struct nft_set_ops *ops, *bops; 3612 struct nft_set_estimate est, best; 3613 const struct nft_set_type *type; 3614 u32 flags = 0; 3615 int i; 3616 3617 lockdep_assert_held(&nft_net->commit_mutex); 3618 lockdep_nfnl_nft_mutex_not_held(); 3619 3620 if (nla[NFTA_SET_FLAGS] != NULL) 3621 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); 3622 3623 bops = NULL; 3624 best.size = ~0; 3625 best.lookup = ~0; 3626 best.space = ~0; 3627 3628 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) { 3629 type = nft_set_types[i]; 3630 ops = &type->ops; 3631 3632 if (!nft_set_ops_candidate(type, flags)) 3633 continue; 3634 if (!ops->estimate(desc, flags, &est)) 3635 continue; 3636 3637 switch (policy) { 3638 case NFT_SET_POL_PERFORMANCE: 3639 if (est.lookup < best.lookup) 3640 break; 3641 if (est.lookup == best.lookup && 3642 est.space < best.space) 3643 break; 3644 continue; 3645 case NFT_SET_POL_MEMORY: 3646 if (!desc->size) { 3647 if (est.space < best.space) 3648 break; 3649 if (est.space == best.space && 3650 est.lookup < best.lookup) 3651 break; 3652 } else if (est.size < best.size || !bops) { 3653 break; 3654 } 3655 continue; 3656 default: 3657 break; 3658 } 3659 3660 bops = ops; 3661 best = est; 3662 } 3663 3664 if (bops != NULL) 3665 return bops; 3666 3667 return ERR_PTR(-EOPNOTSUPP); 3668 } 3669 3670 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { 3671 [NFTA_SET_TABLE] = { .type = NLA_STRING, 3672 .len = NFT_TABLE_MAXNAMELEN - 1 }, 3673 [NFTA_SET_NAME] = { .type = NLA_STRING, 3674 .len = NFT_SET_MAXNAMELEN - 1 }, 3675 [NFTA_SET_FLAGS] = { .type = NLA_U32 }, 3676 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, 3677 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, 3678 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, 3679 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, 3680 [NFTA_SET_POLICY] = { .type = NLA_U32 }, 3681 [NFTA_SET_DESC] = { .type = NLA_NESTED }, 3682 [NFTA_SET_ID] = { .type = NLA_U32 }, 3683 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, 3684 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, 3685 [NFTA_SET_USERDATA] = { .type = NLA_BINARY, 3686 .len = NFT_USERDATA_MAXLEN }, 3687 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, 3688 [NFTA_SET_HANDLE] = { .type = NLA_U64 }, 3689 [NFTA_SET_EXPR] = { .type = NLA_NESTED }, 3690 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED }, 3691 }; 3692 3693 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { 3694 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, 3695 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED }, 3696 }; 3697 3698 static struct nft_set *nft_set_lookup(const struct nft_table *table, 3699 const struct nlattr *nla, u8 genmask) 3700 { 3701 struct nft_set *set; 3702 3703 if (nla == NULL) 3704 return ERR_PTR(-EINVAL); 3705 3706 list_for_each_entry_rcu(set, &table->sets, list) { 3707 if (!nla_strcmp(nla, set->name) && 3708 nft_active_genmask(set, genmask)) 3709 return set; 3710 } 3711 return ERR_PTR(-ENOENT); 3712 } 3713 3714 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table, 3715 const struct nlattr *nla, 3716 u8 genmask) 3717 { 3718 struct nft_set *set; 3719 3720 list_for_each_entry(set, &table->sets, list) { 3721 if (be64_to_cpu(nla_get_be64(nla)) == set->handle && 3722 nft_active_genmask(set, genmask)) 3723 return set; 3724 } 3725 return ERR_PTR(-ENOENT); 3726 } 3727 3728 static struct nft_set *nft_set_lookup_byid(const struct net *net, 3729 const struct nlattr *nla, u8 genmask) 3730 { 3731 struct nftables_pernet *nft_net = nft_pernet(net); 3732 u32 id = ntohl(nla_get_be32(nla)); 3733 struct nft_trans *trans; 3734 3735 list_for_each_entry(trans, &nft_net->commit_list, list) { 3736 if (trans->msg_type == NFT_MSG_NEWSET) { 3737 struct nft_set *set = nft_trans_set(trans); 3738 3739 if (id == nft_trans_set_id(trans) && 3740 nft_active_genmask(set, genmask)) 3741 return set; 3742 } 3743 } 3744 return ERR_PTR(-ENOENT); 3745 } 3746 3747 struct nft_set *nft_set_lookup_global(const struct net *net, 3748 const struct nft_table *table, 3749 const struct nlattr *nla_set_name, 3750 const struct nlattr *nla_set_id, 3751 u8 genmask) 3752 { 3753 struct nft_set *set; 3754 3755 set = nft_set_lookup(table, nla_set_name, genmask); 3756 if (IS_ERR(set)) { 3757 if (!nla_set_id) 3758 return set; 3759 3760 set = nft_set_lookup_byid(net, nla_set_id, genmask); 3761 } 3762 return set; 3763 } 3764 EXPORT_SYMBOL_GPL(nft_set_lookup_global); 3765 3766 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, 3767 const char *name) 3768 { 3769 const struct nft_set *i; 3770 const char *p; 3771 unsigned long *inuse; 3772 unsigned int n = 0, min = 0; 3773 3774 p = strchr(name, '%'); 3775 if (p != NULL) { 3776 if (p[1] != 'd' || strchr(p + 2, '%')) 3777 return -EINVAL; 3778 3779 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); 3780 if (inuse == NULL) 3781 return -ENOMEM; 3782 cont: 3783 list_for_each_entry(i, &ctx->table->sets, list) { 3784 int tmp; 3785 3786 if (!nft_is_active_next(ctx->net, set)) 3787 continue; 3788 if (!sscanf(i->name, name, &tmp)) 3789 continue; 3790 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) 3791 continue; 3792 3793 set_bit(tmp - min, inuse); 3794 } 3795 3796 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); 3797 if (n >= BITS_PER_BYTE * PAGE_SIZE) { 3798 min += BITS_PER_BYTE * PAGE_SIZE; 3799 memset(inuse, 0, PAGE_SIZE); 3800 goto cont; 3801 } 3802 free_page((unsigned long)inuse); 3803 } 3804 3805 set->name = kasprintf(GFP_KERNEL, name, min + n); 3806 if (!set->name) 3807 return -ENOMEM; 3808 3809 list_for_each_entry(i, &ctx->table->sets, list) { 3810 if (!nft_is_active_next(ctx->net, i)) 3811 continue; 3812 if (!strcmp(set->name, i->name)) { 3813 kfree(set->name); 3814 set->name = NULL; 3815 return -ENFILE; 3816 } 3817 } 3818 return 0; 3819 } 3820 3821 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result) 3822 { 3823 u64 ms = be64_to_cpu(nla_get_be64(nla)); 3824 u64 max = (u64)(~((u64)0)); 3825 3826 max = div_u64(max, NSEC_PER_MSEC); 3827 if (ms >= max) 3828 return -ERANGE; 3829 3830 ms *= NSEC_PER_MSEC; 3831 *result = nsecs_to_jiffies64(ms); 3832 return 0; 3833 } 3834 3835 __be64 nf_jiffies64_to_msecs(u64 input) 3836 { 3837 return cpu_to_be64(jiffies64_to_msecs(input)); 3838 } 3839 3840 static int nf_tables_fill_set_concat(struct sk_buff *skb, 3841 const struct nft_set *set) 3842 { 3843 struct nlattr *concat, *field; 3844 int i; 3845 3846 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT); 3847 if (!concat) 3848 return -ENOMEM; 3849 3850 for (i = 0; i < set->field_count; i++) { 3851 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); 3852 if (!field) 3853 return -ENOMEM; 3854 3855 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN, 3856 htonl(set->field_len[i]))) 3857 return -ENOMEM; 3858 3859 nla_nest_end(skb, field); 3860 } 3861 3862 nla_nest_end(skb, concat); 3863 3864 return 0; 3865 } 3866 3867 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, 3868 const struct nft_set *set, u16 event, u16 flags) 3869 { 3870 struct nlmsghdr *nlh; 3871 u32 portid = ctx->portid; 3872 struct nlattr *nest; 3873 u32 seq = ctx->seq; 3874 int i; 3875 3876 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 3877 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family, 3878 NFNETLINK_V0, nft_base_seq(ctx->net)); 3879 if (!nlh) 3880 goto nla_put_failure; 3881 3882 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) 3883 goto nla_put_failure; 3884 if (nla_put_string(skb, NFTA_SET_NAME, set->name)) 3885 goto nla_put_failure; 3886 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle), 3887 NFTA_SET_PAD)) 3888 goto nla_put_failure; 3889 if (set->flags != 0) 3890 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) 3891 goto nla_put_failure; 3892 3893 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) 3894 goto nla_put_failure; 3895 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) 3896 goto nla_put_failure; 3897 if (set->flags & NFT_SET_MAP) { 3898 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) 3899 goto nla_put_failure; 3900 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) 3901 goto nla_put_failure; 3902 } 3903 if (set->flags & NFT_SET_OBJECT && 3904 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) 3905 goto nla_put_failure; 3906 3907 if (set->timeout && 3908 nla_put_be64(skb, NFTA_SET_TIMEOUT, 3909 nf_jiffies64_to_msecs(set->timeout), 3910 NFTA_SET_PAD)) 3911 goto nla_put_failure; 3912 if (set->gc_int && 3913 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) 3914 goto nla_put_failure; 3915 3916 if (set->policy != NFT_SET_POL_PERFORMANCE) { 3917 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) 3918 goto nla_put_failure; 3919 } 3920 3921 if (set->udata && 3922 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) 3923 goto nla_put_failure; 3924 3925 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC); 3926 if (!nest) 3927 goto nla_put_failure; 3928 if (set->size && 3929 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) 3930 goto nla_put_failure; 3931 3932 if (set->field_count > 1 && 3933 nf_tables_fill_set_concat(skb, set)) 3934 goto nla_put_failure; 3935 3936 nla_nest_end(skb, nest); 3937 3938 if (set->num_exprs == 1) { 3939 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR); 3940 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0) 3941 goto nla_put_failure; 3942 3943 nla_nest_end(skb, nest); 3944 } else if (set->num_exprs > 1) { 3945 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS); 3946 if (nest == NULL) 3947 goto nla_put_failure; 3948 3949 for (i = 0; i < set->num_exprs; i++) { 3950 if (nft_expr_dump(skb, NFTA_LIST_ELEM, 3951 set->exprs[i]) < 0) 3952 goto nla_put_failure; 3953 } 3954 nla_nest_end(skb, nest); 3955 } 3956 3957 nlmsg_end(skb, nlh); 3958 return 0; 3959 3960 nla_put_failure: 3961 nlmsg_trim(skb, nlh); 3962 return -1; 3963 } 3964 3965 static void nf_tables_set_notify(const struct nft_ctx *ctx, 3966 const struct nft_set *set, int event, 3967 gfp_t gfp_flags) 3968 { 3969 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 3970 u32 portid = ctx->portid; 3971 struct sk_buff *skb; 3972 u16 flags = 0; 3973 int err; 3974 3975 if (!ctx->report && 3976 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 3977 return; 3978 3979 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); 3980 if (skb == NULL) 3981 goto err; 3982 3983 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 3984 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 3985 3986 err = nf_tables_fill_set(skb, ctx, set, event, flags); 3987 if (err < 0) { 3988 kfree_skb(skb); 3989 goto err; 3990 } 3991 3992 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 3993 return; 3994 err: 3995 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 3996 } 3997 3998 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) 3999 { 4000 const struct nft_set *set; 4001 unsigned int idx, s_idx = cb->args[0]; 4002 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; 4003 struct net *net = sock_net(skb->sk); 4004 struct nft_ctx *ctx = cb->data, ctx_set; 4005 struct nftables_pernet *nft_net; 4006 4007 if (cb->args[1]) 4008 return skb->len; 4009 4010 rcu_read_lock(); 4011 nft_net = nft_pernet(net); 4012 cb->seq = nft_net->base_seq; 4013 4014 list_for_each_entry_rcu(table, &nft_net->tables, list) { 4015 if (ctx->family != NFPROTO_UNSPEC && 4016 ctx->family != table->family) 4017 continue; 4018 4019 if (ctx->table && ctx->table != table) 4020 continue; 4021 4022 if (cur_table) { 4023 if (cur_table != table) 4024 continue; 4025 4026 cur_table = NULL; 4027 } 4028 idx = 0; 4029 list_for_each_entry_rcu(set, &table->sets, list) { 4030 if (idx < s_idx) 4031 goto cont; 4032 if (!nft_is_active(net, set)) 4033 goto cont; 4034 4035 ctx_set = *ctx; 4036 ctx_set.table = table; 4037 ctx_set.family = table->family; 4038 4039 if (nf_tables_fill_set(skb, &ctx_set, set, 4040 NFT_MSG_NEWSET, 4041 NLM_F_MULTI) < 0) { 4042 cb->args[0] = idx; 4043 cb->args[2] = (unsigned long) table; 4044 goto done; 4045 } 4046 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4047 cont: 4048 idx++; 4049 } 4050 if (s_idx) 4051 s_idx = 0; 4052 } 4053 cb->args[1] = 1; 4054 done: 4055 rcu_read_unlock(); 4056 return skb->len; 4057 } 4058 4059 static int nf_tables_dump_sets_start(struct netlink_callback *cb) 4060 { 4061 struct nft_ctx *ctx_dump = NULL; 4062 4063 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC); 4064 if (ctx_dump == NULL) 4065 return -ENOMEM; 4066 4067 cb->data = ctx_dump; 4068 return 0; 4069 } 4070 4071 static int nf_tables_dump_sets_done(struct netlink_callback *cb) 4072 { 4073 kfree(cb->data); 4074 return 0; 4075 } 4076 4077 /* called with rcu_read_lock held */ 4078 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info, 4079 const struct nlattr * const nla[]) 4080 { 4081 struct netlink_ext_ack *extack = info->extack; 4082 u8 genmask = nft_genmask_cur(info->net); 4083 u8 family = info->nfmsg->nfgen_family; 4084 struct nft_table *table = NULL; 4085 struct net *net = info->net; 4086 const struct nft_set *set; 4087 struct sk_buff *skb2; 4088 struct nft_ctx ctx; 4089 int err; 4090 4091 if (nla[NFTA_SET_TABLE]) { 4092 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, 4093 genmask, 0); 4094 if (IS_ERR(table)) { 4095 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4096 return PTR_ERR(table); 4097 } 4098 } 4099 4100 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4101 4102 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 4103 struct netlink_dump_control c = { 4104 .start = nf_tables_dump_sets_start, 4105 .dump = nf_tables_dump_sets, 4106 .done = nf_tables_dump_sets_done, 4107 .data = &ctx, 4108 .module = THIS_MODULE, 4109 }; 4110 4111 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 4112 } 4113 4114 /* Only accept unspec with dump */ 4115 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC) 4116 return -EAFNOSUPPORT; 4117 if (!nla[NFTA_SET_TABLE]) 4118 return -EINVAL; 4119 4120 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); 4121 if (IS_ERR(set)) 4122 return PTR_ERR(set); 4123 4124 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 4125 if (skb2 == NULL) 4126 return -ENOMEM; 4127 4128 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); 4129 if (err < 0) 4130 goto err_fill_set_info; 4131 4132 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 4133 4134 err_fill_set_info: 4135 kfree_skb(skb2); 4136 return err; 4137 } 4138 4139 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = { 4140 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 }, 4141 }; 4142 4143 static int nft_set_desc_concat_parse(const struct nlattr *attr, 4144 struct nft_set_desc *desc) 4145 { 4146 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1]; 4147 u32 len; 4148 int err; 4149 4150 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr, 4151 nft_concat_policy, NULL); 4152 if (err < 0) 4153 return err; 4154 4155 if (!tb[NFTA_SET_FIELD_LEN]) 4156 return -EINVAL; 4157 4158 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN])); 4159 4160 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT) 4161 return -E2BIG; 4162 4163 desc->field_len[desc->field_count++] = len; 4164 4165 return 0; 4166 } 4167 4168 static int nft_set_desc_concat(struct nft_set_desc *desc, 4169 const struct nlattr *nla) 4170 { 4171 struct nlattr *attr; 4172 int rem, err; 4173 4174 nla_for_each_nested(attr, nla, rem) { 4175 if (nla_type(attr) != NFTA_LIST_ELEM) 4176 return -EINVAL; 4177 4178 err = nft_set_desc_concat_parse(attr, desc); 4179 if (err < 0) 4180 return err; 4181 } 4182 4183 return 0; 4184 } 4185 4186 static int nf_tables_set_desc_parse(struct nft_set_desc *desc, 4187 const struct nlattr *nla) 4188 { 4189 struct nlattr *da[NFTA_SET_DESC_MAX + 1]; 4190 int err; 4191 4192 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla, 4193 nft_set_desc_policy, NULL); 4194 if (err < 0) 4195 return err; 4196 4197 if (da[NFTA_SET_DESC_SIZE] != NULL) 4198 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); 4199 if (da[NFTA_SET_DESC_CONCAT]) 4200 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]); 4201 4202 return err; 4203 } 4204 4205 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, 4206 const struct nlattr * const nla[]) 4207 { 4208 u32 ktype, dtype, flags, policy, gc_int, objtype; 4209 struct netlink_ext_ack *extack = info->extack; 4210 u8 genmask = nft_genmask_next(info->net); 4211 u8 family = info->nfmsg->nfgen_family; 4212 const struct nft_set_ops *ops; 4213 struct nft_expr *expr = NULL; 4214 struct net *net = info->net; 4215 struct nft_set_desc desc; 4216 struct nft_table *table; 4217 unsigned char *udata; 4218 struct nft_set *set; 4219 struct nft_ctx ctx; 4220 size_t alloc_size; 4221 u64 timeout; 4222 char *name; 4223 int err, i; 4224 u16 udlen; 4225 u64 size; 4226 4227 if (nla[NFTA_SET_TABLE] == NULL || 4228 nla[NFTA_SET_NAME] == NULL || 4229 nla[NFTA_SET_KEY_LEN] == NULL || 4230 nla[NFTA_SET_ID] == NULL) 4231 return -EINVAL; 4232 4233 memset(&desc, 0, sizeof(desc)); 4234 4235 ktype = NFT_DATA_VALUE; 4236 if (nla[NFTA_SET_KEY_TYPE] != NULL) { 4237 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); 4238 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) 4239 return -EINVAL; 4240 } 4241 4242 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); 4243 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) 4244 return -EINVAL; 4245 4246 flags = 0; 4247 if (nla[NFTA_SET_FLAGS] != NULL) { 4248 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); 4249 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | 4250 NFT_SET_INTERVAL | NFT_SET_TIMEOUT | 4251 NFT_SET_MAP | NFT_SET_EVAL | 4252 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR)) 4253 return -EOPNOTSUPP; 4254 /* Only one of these operations is supported */ 4255 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) == 4256 (NFT_SET_MAP | NFT_SET_OBJECT)) 4257 return -EOPNOTSUPP; 4258 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) == 4259 (NFT_SET_EVAL | NFT_SET_OBJECT)) 4260 return -EOPNOTSUPP; 4261 } 4262 4263 dtype = 0; 4264 if (nla[NFTA_SET_DATA_TYPE] != NULL) { 4265 if (!(flags & NFT_SET_MAP)) 4266 return -EINVAL; 4267 4268 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); 4269 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && 4270 dtype != NFT_DATA_VERDICT) 4271 return -EINVAL; 4272 4273 if (dtype != NFT_DATA_VERDICT) { 4274 if (nla[NFTA_SET_DATA_LEN] == NULL) 4275 return -EINVAL; 4276 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); 4277 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) 4278 return -EINVAL; 4279 } else 4280 desc.dlen = sizeof(struct nft_verdict); 4281 } else if (flags & NFT_SET_MAP) 4282 return -EINVAL; 4283 4284 if (nla[NFTA_SET_OBJ_TYPE] != NULL) { 4285 if (!(flags & NFT_SET_OBJECT)) 4286 return -EINVAL; 4287 4288 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); 4289 if (objtype == NFT_OBJECT_UNSPEC || 4290 objtype > NFT_OBJECT_MAX) 4291 return -EOPNOTSUPP; 4292 } else if (flags & NFT_SET_OBJECT) 4293 return -EINVAL; 4294 else 4295 objtype = NFT_OBJECT_UNSPEC; 4296 4297 timeout = 0; 4298 if (nla[NFTA_SET_TIMEOUT] != NULL) { 4299 if (!(flags & NFT_SET_TIMEOUT)) 4300 return -EINVAL; 4301 4302 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout); 4303 if (err) 4304 return err; 4305 } 4306 gc_int = 0; 4307 if (nla[NFTA_SET_GC_INTERVAL] != NULL) { 4308 if (!(flags & NFT_SET_TIMEOUT)) 4309 return -EINVAL; 4310 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); 4311 } 4312 4313 policy = NFT_SET_POL_PERFORMANCE; 4314 if (nla[NFTA_SET_POLICY] != NULL) 4315 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); 4316 4317 if (nla[NFTA_SET_DESC] != NULL) { 4318 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]); 4319 if (err < 0) 4320 return err; 4321 } 4322 4323 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS]) 4324 desc.expr = true; 4325 4326 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask, 4327 NETLINK_CB(skb).portid); 4328 if (IS_ERR(table)) { 4329 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4330 return PTR_ERR(table); 4331 } 4332 4333 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4334 4335 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); 4336 if (IS_ERR(set)) { 4337 if (PTR_ERR(set) != -ENOENT) { 4338 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); 4339 return PTR_ERR(set); 4340 } 4341 } else { 4342 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 4343 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); 4344 return -EEXIST; 4345 } 4346 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 4347 return -EOPNOTSUPP; 4348 4349 return 0; 4350 } 4351 4352 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) 4353 return -ENOENT; 4354 4355 ops = nft_select_set_ops(&ctx, nla, &desc, policy); 4356 if (IS_ERR(ops)) 4357 return PTR_ERR(ops); 4358 4359 udlen = 0; 4360 if (nla[NFTA_SET_USERDATA]) 4361 udlen = nla_len(nla[NFTA_SET_USERDATA]); 4362 4363 size = 0; 4364 if (ops->privsize != NULL) 4365 size = ops->privsize(nla, &desc); 4366 alloc_size = sizeof(*set) + size + udlen; 4367 if (alloc_size < size || alloc_size > INT_MAX) 4368 return -ENOMEM; 4369 set = kvzalloc(alloc_size, GFP_KERNEL); 4370 if (!set) 4371 return -ENOMEM; 4372 4373 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL); 4374 if (!name) { 4375 err = -ENOMEM; 4376 goto err_set_name; 4377 } 4378 4379 err = nf_tables_set_alloc_name(&ctx, set, name); 4380 kfree(name); 4381 if (err < 0) 4382 goto err_set_name; 4383 4384 udata = NULL; 4385 if (udlen) { 4386 udata = set->data + size; 4387 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); 4388 } 4389 4390 INIT_LIST_HEAD(&set->bindings); 4391 INIT_LIST_HEAD(&set->catchall_list); 4392 set->table = table; 4393 write_pnet(&set->net, net); 4394 set->ops = ops; 4395 set->ktype = ktype; 4396 set->klen = desc.klen; 4397 set->dtype = dtype; 4398 set->objtype = objtype; 4399 set->dlen = desc.dlen; 4400 set->flags = flags; 4401 set->size = desc.size; 4402 set->policy = policy; 4403 set->udlen = udlen; 4404 set->udata = udata; 4405 set->timeout = timeout; 4406 set->gc_int = gc_int; 4407 4408 set->field_count = desc.field_count; 4409 for (i = 0; i < desc.field_count; i++) 4410 set->field_len[i] = desc.field_len[i]; 4411 4412 err = ops->init(set, &desc, nla); 4413 if (err < 0) 4414 goto err_set_init; 4415 4416 if (nla[NFTA_SET_EXPR]) { 4417 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]); 4418 if (IS_ERR(expr)) { 4419 err = PTR_ERR(expr); 4420 goto err_set_expr_alloc; 4421 } 4422 set->exprs[0] = expr; 4423 set->num_exprs++; 4424 } else if (nla[NFTA_SET_EXPRESSIONS]) { 4425 struct nft_expr *expr; 4426 struct nlattr *tmp; 4427 int left; 4428 4429 if (!(flags & NFT_SET_EXPR)) { 4430 err = -EINVAL; 4431 goto err_set_expr_alloc; 4432 } 4433 i = 0; 4434 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) { 4435 if (i == NFT_SET_EXPR_MAX) { 4436 err = -E2BIG; 4437 goto err_set_expr_alloc; 4438 } 4439 if (nla_type(tmp) != NFTA_LIST_ELEM) { 4440 err = -EINVAL; 4441 goto err_set_expr_alloc; 4442 } 4443 expr = nft_set_elem_expr_alloc(&ctx, set, tmp); 4444 if (IS_ERR(expr)) { 4445 err = PTR_ERR(expr); 4446 goto err_set_expr_alloc; 4447 } 4448 set->exprs[i++] = expr; 4449 set->num_exprs++; 4450 } 4451 } 4452 4453 set->handle = nf_tables_alloc_handle(table); 4454 4455 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); 4456 if (err < 0) 4457 goto err_set_expr_alloc; 4458 4459 list_add_tail_rcu(&set->list, &table->sets); 4460 table->use++; 4461 return 0; 4462 4463 err_set_expr_alloc: 4464 for (i = 0; i < set->num_exprs; i++) 4465 nft_expr_destroy(&ctx, set->exprs[i]); 4466 4467 ops->destroy(set); 4468 err_set_init: 4469 kfree(set->name); 4470 err_set_name: 4471 kvfree(set); 4472 return err; 4473 } 4474 4475 struct nft_set_elem_catchall { 4476 struct list_head list; 4477 struct rcu_head rcu; 4478 void *elem; 4479 }; 4480 4481 static void nft_set_catchall_destroy(const struct nft_ctx *ctx, 4482 struct nft_set *set) 4483 { 4484 struct nft_set_elem_catchall *catchall; 4485 4486 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 4487 list_del_rcu(&catchall->list); 4488 nft_set_elem_destroy(set, catchall->elem, true); 4489 kfree_rcu(catchall); 4490 } 4491 } 4492 4493 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) 4494 { 4495 int i; 4496 4497 if (WARN_ON(set->use > 0)) 4498 return; 4499 4500 for (i = 0; i < set->num_exprs; i++) 4501 nft_expr_destroy(ctx, set->exprs[i]); 4502 4503 set->ops->destroy(set); 4504 nft_set_catchall_destroy(ctx, set); 4505 kfree(set->name); 4506 kvfree(set); 4507 } 4508 4509 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info, 4510 const struct nlattr * const nla[]) 4511 { 4512 struct netlink_ext_ack *extack = info->extack; 4513 u8 genmask = nft_genmask_next(info->net); 4514 u8 family = info->nfmsg->nfgen_family; 4515 struct net *net = info->net; 4516 const struct nlattr *attr; 4517 struct nft_table *table; 4518 struct nft_set *set; 4519 struct nft_ctx ctx; 4520 4521 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC) 4522 return -EAFNOSUPPORT; 4523 4524 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, 4525 genmask, NETLINK_CB(skb).portid); 4526 if (IS_ERR(table)) { 4527 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4528 return PTR_ERR(table); 4529 } 4530 4531 if (nla[NFTA_SET_HANDLE]) { 4532 attr = nla[NFTA_SET_HANDLE]; 4533 set = nft_set_lookup_byhandle(table, attr, genmask); 4534 } else { 4535 attr = nla[NFTA_SET_NAME]; 4536 set = nft_set_lookup(table, attr, genmask); 4537 } 4538 4539 if (IS_ERR(set)) { 4540 NL_SET_BAD_ATTR(extack, attr); 4541 return PTR_ERR(set); 4542 } 4543 if (set->use || 4544 (info->nlh->nlmsg_flags & NLM_F_NONREC && 4545 atomic_read(&set->nelems) > 0)) { 4546 NL_SET_BAD_ATTR(extack, attr); 4547 return -EBUSY; 4548 } 4549 4550 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4551 4552 return nft_delset(&ctx, set); 4553 } 4554 4555 static int nft_validate_register_store(const struct nft_ctx *ctx, 4556 enum nft_registers reg, 4557 const struct nft_data *data, 4558 enum nft_data_types type, 4559 unsigned int len); 4560 4561 static int nft_setelem_data_validate(const struct nft_ctx *ctx, 4562 struct nft_set *set, 4563 struct nft_set_elem *elem) 4564 { 4565 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 4566 enum nft_registers dreg; 4567 4568 dreg = nft_type_to_reg(set->dtype); 4569 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), 4570 set->dtype == NFT_DATA_VERDICT ? 4571 NFT_DATA_VERDICT : NFT_DATA_VALUE, 4572 set->dlen); 4573 } 4574 4575 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, 4576 struct nft_set *set, 4577 const struct nft_set_iter *iter, 4578 struct nft_set_elem *elem) 4579 { 4580 return nft_setelem_data_validate(ctx, set, elem); 4581 } 4582 4583 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx, 4584 struct nft_set *set) 4585 { 4586 u8 genmask = nft_genmask_next(ctx->net); 4587 struct nft_set_elem_catchall *catchall; 4588 struct nft_set_elem elem; 4589 struct nft_set_ext *ext; 4590 int ret = 0; 4591 4592 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 4593 ext = nft_set_elem_ext(set, catchall->elem); 4594 if (!nft_set_elem_active(ext, genmask)) 4595 continue; 4596 4597 elem.priv = catchall->elem; 4598 ret = nft_setelem_data_validate(ctx, set, &elem); 4599 if (ret < 0) 4600 break; 4601 } 4602 4603 return ret; 4604 } 4605 4606 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 4607 struct nft_set_binding *binding) 4608 { 4609 struct nft_set_binding *i; 4610 struct nft_set_iter iter; 4611 4612 if (set->use == UINT_MAX) 4613 return -EOVERFLOW; 4614 4615 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) 4616 return -EBUSY; 4617 4618 if (binding->flags & NFT_SET_MAP) { 4619 /* If the set is already bound to the same chain all 4620 * jumps are already validated for that chain. 4621 */ 4622 list_for_each_entry(i, &set->bindings, list) { 4623 if (i->flags & NFT_SET_MAP && 4624 i->chain == binding->chain) 4625 goto bind; 4626 } 4627 4628 iter.genmask = nft_genmask_next(ctx->net); 4629 iter.skip = 0; 4630 iter.count = 0; 4631 iter.err = 0; 4632 iter.fn = nf_tables_bind_check_setelem; 4633 4634 set->ops->walk(ctx, set, &iter); 4635 if (!iter.err) 4636 iter.err = nft_set_catchall_bind_check(ctx, set); 4637 4638 if (iter.err < 0) 4639 return iter.err; 4640 } 4641 bind: 4642 binding->chain = ctx->chain; 4643 list_add_tail_rcu(&binding->list, &set->bindings); 4644 nft_set_trans_bind(ctx, set); 4645 set->use++; 4646 4647 return 0; 4648 } 4649 EXPORT_SYMBOL_GPL(nf_tables_bind_set); 4650 4651 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, 4652 struct nft_set_binding *binding, bool event) 4653 { 4654 list_del_rcu(&binding->list); 4655 4656 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) { 4657 list_del_rcu(&set->list); 4658 if (event) 4659 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, 4660 GFP_KERNEL); 4661 } 4662 } 4663 4664 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 4665 struct nft_set_binding *binding, 4666 enum nft_trans_phase phase) 4667 { 4668 switch (phase) { 4669 case NFT_TRANS_PREPARE: 4670 set->use--; 4671 return; 4672 case NFT_TRANS_ABORT: 4673 case NFT_TRANS_RELEASE: 4674 set->use--; 4675 fallthrough; 4676 default: 4677 nf_tables_unbind_set(ctx, set, binding, 4678 phase == NFT_TRANS_COMMIT); 4679 } 4680 } 4681 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set); 4682 4683 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set) 4684 { 4685 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) 4686 nft_set_destroy(ctx, set); 4687 } 4688 EXPORT_SYMBOL_GPL(nf_tables_destroy_set); 4689 4690 const struct nft_set_ext_type nft_set_ext_types[] = { 4691 [NFT_SET_EXT_KEY] = { 4692 .align = __alignof__(u32), 4693 }, 4694 [NFT_SET_EXT_DATA] = { 4695 .align = __alignof__(u32), 4696 }, 4697 [NFT_SET_EXT_EXPRESSIONS] = { 4698 .align = __alignof__(struct nft_set_elem_expr), 4699 }, 4700 [NFT_SET_EXT_OBJREF] = { 4701 .len = sizeof(struct nft_object *), 4702 .align = __alignof__(struct nft_object *), 4703 }, 4704 [NFT_SET_EXT_FLAGS] = { 4705 .len = sizeof(u8), 4706 .align = __alignof__(u8), 4707 }, 4708 [NFT_SET_EXT_TIMEOUT] = { 4709 .len = sizeof(u64), 4710 .align = __alignof__(u64), 4711 }, 4712 [NFT_SET_EXT_EXPIRATION] = { 4713 .len = sizeof(u64), 4714 .align = __alignof__(u64), 4715 }, 4716 [NFT_SET_EXT_USERDATA] = { 4717 .len = sizeof(struct nft_userdata), 4718 .align = __alignof__(struct nft_userdata), 4719 }, 4720 [NFT_SET_EXT_KEY_END] = { 4721 .align = __alignof__(u32), 4722 }, 4723 }; 4724 4725 /* 4726 * Set elements 4727 */ 4728 4729 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { 4730 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, 4731 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, 4732 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, 4733 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, 4734 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 }, 4735 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, 4736 .len = NFT_USERDATA_MAXLEN }, 4737 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED }, 4738 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING, 4739 .len = NFT_OBJ_MAXNAMELEN - 1 }, 4740 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED }, 4741 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED }, 4742 }; 4743 4744 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { 4745 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, 4746 .len = NFT_TABLE_MAXNAMELEN - 1 }, 4747 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, 4748 .len = NFT_SET_MAXNAMELEN - 1 }, 4749 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, 4750 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, 4751 }; 4752 4753 static int nft_set_elem_expr_dump(struct sk_buff *skb, 4754 const struct nft_set *set, 4755 const struct nft_set_ext *ext) 4756 { 4757 struct nft_set_elem_expr *elem_expr; 4758 u32 size, num_exprs = 0; 4759 struct nft_expr *expr; 4760 struct nlattr *nest; 4761 4762 elem_expr = nft_set_ext_expr(ext); 4763 nft_setelem_expr_foreach(expr, elem_expr, size) 4764 num_exprs++; 4765 4766 if (num_exprs == 1) { 4767 expr = nft_setelem_expr_at(elem_expr, 0); 4768 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0) 4769 return -1; 4770 4771 return 0; 4772 } else if (num_exprs > 1) { 4773 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS); 4774 if (nest == NULL) 4775 goto nla_put_failure; 4776 4777 nft_setelem_expr_foreach(expr, elem_expr, size) { 4778 expr = nft_setelem_expr_at(elem_expr, size); 4779 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) 4780 goto nla_put_failure; 4781 } 4782 nla_nest_end(skb, nest); 4783 } 4784 return 0; 4785 4786 nla_put_failure: 4787 return -1; 4788 } 4789 4790 static int nf_tables_fill_setelem(struct sk_buff *skb, 4791 const struct nft_set *set, 4792 const struct nft_set_elem *elem) 4793 { 4794 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 4795 unsigned char *b = skb_tail_pointer(skb); 4796 struct nlattr *nest; 4797 4798 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); 4799 if (nest == NULL) 4800 goto nla_put_failure; 4801 4802 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) && 4803 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), 4804 NFT_DATA_VALUE, set->klen) < 0) 4805 goto nla_put_failure; 4806 4807 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) && 4808 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext), 4809 NFT_DATA_VALUE, set->klen) < 0) 4810 goto nla_put_failure; 4811 4812 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 4813 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), 4814 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, 4815 set->dlen) < 0) 4816 goto nla_put_failure; 4817 4818 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) && 4819 nft_set_elem_expr_dump(skb, set, ext)) 4820 goto nla_put_failure; 4821 4822 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && 4823 nla_put_string(skb, NFTA_SET_ELEM_OBJREF, 4824 (*nft_set_ext_obj(ext))->key.name) < 0) 4825 goto nla_put_failure; 4826 4827 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 4828 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, 4829 htonl(*nft_set_ext_flags(ext)))) 4830 goto nla_put_failure; 4831 4832 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && 4833 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, 4834 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)), 4835 NFTA_SET_ELEM_PAD)) 4836 goto nla_put_failure; 4837 4838 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { 4839 u64 expires, now = get_jiffies_64(); 4840 4841 expires = *nft_set_ext_expiration(ext); 4842 if (time_before64(now, expires)) 4843 expires -= now; 4844 else 4845 expires = 0; 4846 4847 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, 4848 nf_jiffies64_to_msecs(expires), 4849 NFTA_SET_ELEM_PAD)) 4850 goto nla_put_failure; 4851 } 4852 4853 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { 4854 struct nft_userdata *udata; 4855 4856 udata = nft_set_ext_userdata(ext); 4857 if (nla_put(skb, NFTA_SET_ELEM_USERDATA, 4858 udata->len + 1, udata->data)) 4859 goto nla_put_failure; 4860 } 4861 4862 nla_nest_end(skb, nest); 4863 return 0; 4864 4865 nla_put_failure: 4866 nlmsg_trim(skb, b); 4867 return -EMSGSIZE; 4868 } 4869 4870 struct nft_set_dump_args { 4871 const struct netlink_callback *cb; 4872 struct nft_set_iter iter; 4873 struct sk_buff *skb; 4874 }; 4875 4876 static int nf_tables_dump_setelem(const struct nft_ctx *ctx, 4877 struct nft_set *set, 4878 const struct nft_set_iter *iter, 4879 struct nft_set_elem *elem) 4880 { 4881 struct nft_set_dump_args *args; 4882 4883 args = container_of(iter, struct nft_set_dump_args, iter); 4884 return nf_tables_fill_setelem(args->skb, set, elem); 4885 } 4886 4887 struct nft_set_dump_ctx { 4888 const struct nft_set *set; 4889 struct nft_ctx ctx; 4890 }; 4891 4892 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb, 4893 const struct nft_set *set) 4894 { 4895 struct nft_set_elem_catchall *catchall; 4896 u8 genmask = nft_genmask_cur(net); 4897 struct nft_set_elem elem; 4898 struct nft_set_ext *ext; 4899 int ret = 0; 4900 4901 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 4902 ext = nft_set_elem_ext(set, catchall->elem); 4903 if (!nft_set_elem_active(ext, genmask) || 4904 nft_set_elem_expired(ext)) 4905 continue; 4906 4907 elem.priv = catchall->elem; 4908 ret = nf_tables_fill_setelem(skb, set, &elem); 4909 break; 4910 } 4911 4912 return ret; 4913 } 4914 4915 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) 4916 { 4917 struct nft_set_dump_ctx *dump_ctx = cb->data; 4918 struct net *net = sock_net(skb->sk); 4919 struct nftables_pernet *nft_net; 4920 struct nft_table *table; 4921 struct nft_set *set; 4922 struct nft_set_dump_args args; 4923 bool set_found = false; 4924 struct nlmsghdr *nlh; 4925 struct nlattr *nest; 4926 u32 portid, seq; 4927 int event; 4928 4929 rcu_read_lock(); 4930 nft_net = nft_pernet(net); 4931 list_for_each_entry_rcu(table, &nft_net->tables, list) { 4932 if (dump_ctx->ctx.family != NFPROTO_UNSPEC && 4933 dump_ctx->ctx.family != table->family) 4934 continue; 4935 4936 if (table != dump_ctx->ctx.table) 4937 continue; 4938 4939 list_for_each_entry_rcu(set, &table->sets, list) { 4940 if (set == dump_ctx->set) { 4941 set_found = true; 4942 break; 4943 } 4944 } 4945 break; 4946 } 4947 4948 if (!set_found) { 4949 rcu_read_unlock(); 4950 return -ENOENT; 4951 } 4952 4953 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); 4954 portid = NETLINK_CB(cb->skb).portid; 4955 seq = cb->nlh->nlmsg_seq; 4956 4957 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI, 4958 table->family, NFNETLINK_V0, nft_base_seq(net)); 4959 if (!nlh) 4960 goto nla_put_failure; 4961 4962 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) 4963 goto nla_put_failure; 4964 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) 4965 goto nla_put_failure; 4966 4967 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS); 4968 if (nest == NULL) 4969 goto nla_put_failure; 4970 4971 args.cb = cb; 4972 args.skb = skb; 4973 args.iter.genmask = nft_genmask_cur(net); 4974 args.iter.skip = cb->args[0]; 4975 args.iter.count = 0; 4976 args.iter.err = 0; 4977 args.iter.fn = nf_tables_dump_setelem; 4978 set->ops->walk(&dump_ctx->ctx, set, &args.iter); 4979 4980 if (!args.iter.err && args.iter.count == cb->args[0]) 4981 args.iter.err = nft_set_catchall_dump(net, skb, set); 4982 rcu_read_unlock(); 4983 4984 nla_nest_end(skb, nest); 4985 nlmsg_end(skb, nlh); 4986 4987 if (args.iter.err && args.iter.err != -EMSGSIZE) 4988 return args.iter.err; 4989 if (args.iter.count == cb->args[0]) 4990 return 0; 4991 4992 cb->args[0] = args.iter.count; 4993 return skb->len; 4994 4995 nla_put_failure: 4996 rcu_read_unlock(); 4997 return -ENOSPC; 4998 } 4999 5000 static int nf_tables_dump_set_start(struct netlink_callback *cb) 5001 { 5002 struct nft_set_dump_ctx *dump_ctx = cb->data; 5003 5004 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC); 5005 5006 return cb->data ? 0 : -ENOMEM; 5007 } 5008 5009 static int nf_tables_dump_set_done(struct netlink_callback *cb) 5010 { 5011 kfree(cb->data); 5012 return 0; 5013 } 5014 5015 static int nf_tables_fill_setelem_info(struct sk_buff *skb, 5016 const struct nft_ctx *ctx, u32 seq, 5017 u32 portid, int event, u16 flags, 5018 const struct nft_set *set, 5019 const struct nft_set_elem *elem) 5020 { 5021 struct nlmsghdr *nlh; 5022 struct nlattr *nest; 5023 int err; 5024 5025 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 5026 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family, 5027 NFNETLINK_V0, nft_base_seq(ctx->net)); 5028 if (!nlh) 5029 goto nla_put_failure; 5030 5031 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) 5032 goto nla_put_failure; 5033 if (nla_put_string(skb, NFTA_SET_NAME, set->name)) 5034 goto nla_put_failure; 5035 5036 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS); 5037 if (nest == NULL) 5038 goto nla_put_failure; 5039 5040 err = nf_tables_fill_setelem(skb, set, elem); 5041 if (err < 0) 5042 goto nla_put_failure; 5043 5044 nla_nest_end(skb, nest); 5045 5046 nlmsg_end(skb, nlh); 5047 return 0; 5048 5049 nla_put_failure: 5050 nlmsg_trim(skb, nlh); 5051 return -1; 5052 } 5053 5054 static int nft_setelem_parse_flags(const struct nft_set *set, 5055 const struct nlattr *attr, u32 *flags) 5056 { 5057 if (attr == NULL) 5058 return 0; 5059 5060 *flags = ntohl(nla_get_be32(attr)); 5061 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) 5062 return -EOPNOTSUPP; 5063 if (!(set->flags & NFT_SET_INTERVAL) && 5064 *flags & NFT_SET_ELEM_INTERVAL_END) 5065 return -EINVAL; 5066 5067 return 0; 5068 } 5069 5070 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set, 5071 struct nft_data *key, struct nlattr *attr) 5072 { 5073 struct nft_data_desc desc; 5074 int err; 5075 5076 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr); 5077 if (err < 0) 5078 return err; 5079 5080 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) { 5081 nft_data_release(key, desc.type); 5082 return -EINVAL; 5083 } 5084 5085 return 0; 5086 } 5087 5088 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set, 5089 struct nft_data_desc *desc, 5090 struct nft_data *data, 5091 struct nlattr *attr) 5092 { 5093 int err; 5094 5095 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr); 5096 if (err < 0) 5097 return err; 5098 5099 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) { 5100 nft_data_release(data, desc->type); 5101 return -EINVAL; 5102 } 5103 5104 return 0; 5105 } 5106 5107 static void *nft_setelem_catchall_get(const struct net *net, 5108 const struct nft_set *set) 5109 { 5110 struct nft_set_elem_catchall *catchall; 5111 u8 genmask = nft_genmask_cur(net); 5112 struct nft_set_ext *ext; 5113 void *priv = NULL; 5114 5115 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5116 ext = nft_set_elem_ext(set, catchall->elem); 5117 if (!nft_set_elem_active(ext, genmask) || 5118 nft_set_elem_expired(ext)) 5119 continue; 5120 5121 priv = catchall->elem; 5122 break; 5123 } 5124 5125 return priv; 5126 } 5127 5128 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set, 5129 struct nft_set_elem *elem, u32 flags) 5130 { 5131 void *priv; 5132 5133 if (!(flags & NFT_SET_ELEM_CATCHALL)) { 5134 priv = set->ops->get(ctx->net, set, elem, flags); 5135 if (IS_ERR(priv)) 5136 return PTR_ERR(priv); 5137 } else { 5138 priv = nft_setelem_catchall_get(ctx->net, set); 5139 if (!priv) 5140 return -ENOENT; 5141 } 5142 elem->priv = priv; 5143 5144 return 0; 5145 } 5146 5147 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, 5148 const struct nlattr *attr) 5149 { 5150 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 5151 struct nft_set_elem elem; 5152 struct sk_buff *skb; 5153 uint32_t flags = 0; 5154 int err; 5155 5156 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 5157 nft_set_elem_policy, NULL); 5158 if (err < 0) 5159 return err; 5160 5161 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 5162 if (err < 0) 5163 return err; 5164 5165 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 5166 return -EINVAL; 5167 5168 if (nla[NFTA_SET_ELEM_KEY]) { 5169 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 5170 nla[NFTA_SET_ELEM_KEY]); 5171 if (err < 0) 5172 return err; 5173 } 5174 5175 if (nla[NFTA_SET_ELEM_KEY_END]) { 5176 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 5177 nla[NFTA_SET_ELEM_KEY_END]); 5178 if (err < 0) 5179 return err; 5180 } 5181 5182 err = nft_setelem_get(ctx, set, &elem, flags); 5183 if (err < 0) 5184 return err; 5185 5186 err = -ENOMEM; 5187 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 5188 if (skb == NULL) 5189 return err; 5190 5191 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, 5192 NFT_MSG_NEWSETELEM, 0, set, &elem); 5193 if (err < 0) 5194 goto err_fill_setelem; 5195 5196 return nfnetlink_unicast(skb, ctx->net, ctx->portid); 5197 5198 err_fill_setelem: 5199 kfree_skb(skb); 5200 return err; 5201 } 5202 5203 /* called with rcu_read_lock held */ 5204 static int nf_tables_getsetelem(struct sk_buff *skb, 5205 const struct nfnl_info *info, 5206 const struct nlattr * const nla[]) 5207 { 5208 struct netlink_ext_ack *extack = info->extack; 5209 u8 genmask = nft_genmask_cur(info->net); 5210 u8 family = info->nfmsg->nfgen_family; 5211 struct net *net = info->net; 5212 struct nft_table *table; 5213 struct nft_set *set; 5214 struct nlattr *attr; 5215 struct nft_ctx ctx; 5216 int rem, err = 0; 5217 5218 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 5219 genmask, NETLINK_CB(skb).portid); 5220 if (IS_ERR(table)) { 5221 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 5222 return PTR_ERR(table); 5223 } 5224 5225 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask); 5226 if (IS_ERR(set)) 5227 return PTR_ERR(set); 5228 5229 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 5230 5231 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 5232 struct netlink_dump_control c = { 5233 .start = nf_tables_dump_set_start, 5234 .dump = nf_tables_dump_set, 5235 .done = nf_tables_dump_set_done, 5236 .module = THIS_MODULE, 5237 }; 5238 struct nft_set_dump_ctx dump_ctx = { 5239 .set = set, 5240 .ctx = ctx, 5241 }; 5242 5243 c.data = &dump_ctx; 5244 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 5245 } 5246 5247 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) 5248 return -EINVAL; 5249 5250 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 5251 err = nft_get_set_elem(&ctx, set, attr); 5252 if (err < 0) 5253 break; 5254 } 5255 5256 return err; 5257 } 5258 5259 static void nf_tables_setelem_notify(const struct nft_ctx *ctx, 5260 const struct nft_set *set, 5261 const struct nft_set_elem *elem, 5262 int event) 5263 { 5264 struct nftables_pernet *nft_net; 5265 struct net *net = ctx->net; 5266 u32 portid = ctx->portid; 5267 struct sk_buff *skb; 5268 u16 flags = 0; 5269 int err; 5270 5271 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 5272 return; 5273 5274 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 5275 if (skb == NULL) 5276 goto err; 5277 5278 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 5279 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 5280 5281 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, 5282 set, elem); 5283 if (err < 0) { 5284 kfree_skb(skb); 5285 goto err; 5286 } 5287 5288 nft_net = nft_pernet(net); 5289 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 5290 return; 5291 err: 5292 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 5293 } 5294 5295 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, 5296 int msg_type, 5297 struct nft_set *set) 5298 { 5299 struct nft_trans *trans; 5300 5301 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); 5302 if (trans == NULL) 5303 return NULL; 5304 5305 nft_trans_elem_set(trans) = set; 5306 return trans; 5307 } 5308 5309 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 5310 const struct nft_set *set, 5311 const struct nlattr *attr) 5312 { 5313 struct nft_expr *expr; 5314 int err; 5315 5316 expr = nft_expr_init(ctx, attr); 5317 if (IS_ERR(expr)) 5318 return expr; 5319 5320 err = -EOPNOTSUPP; 5321 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL)) 5322 goto err_set_elem_expr; 5323 5324 if (expr->ops->type->flags & NFT_EXPR_GC) { 5325 if (set->flags & NFT_SET_TIMEOUT) 5326 goto err_set_elem_expr; 5327 if (!set->ops->gc_init) 5328 goto err_set_elem_expr; 5329 set->ops->gc_init(set); 5330 } 5331 5332 return expr; 5333 5334 err_set_elem_expr: 5335 nft_expr_destroy(ctx, expr); 5336 return ERR_PTR(err); 5337 } 5338 5339 void *nft_set_elem_init(const struct nft_set *set, 5340 const struct nft_set_ext_tmpl *tmpl, 5341 const u32 *key, const u32 *key_end, 5342 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp) 5343 { 5344 struct nft_set_ext *ext; 5345 void *elem; 5346 5347 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); 5348 if (elem == NULL) 5349 return NULL; 5350 5351 ext = nft_set_elem_ext(set, elem); 5352 nft_set_ext_init(ext, tmpl); 5353 5354 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY)) 5355 memcpy(nft_set_ext_key(ext), key, set->klen); 5356 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END)) 5357 memcpy(nft_set_ext_key_end(ext), key_end, set->klen); 5358 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 5359 memcpy(nft_set_ext_data(ext), data, set->dlen); 5360 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { 5361 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration; 5362 if (expiration == 0) 5363 *nft_set_ext_expiration(ext) += timeout; 5364 } 5365 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) 5366 *nft_set_ext_timeout(ext) = timeout; 5367 5368 return elem; 5369 } 5370 5371 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx, 5372 struct nft_expr *expr) 5373 { 5374 if (expr->ops->destroy_clone) { 5375 expr->ops->destroy_clone(ctx, expr); 5376 module_put(expr->ops->type->owner); 5377 } else { 5378 nf_tables_expr_destroy(ctx, expr); 5379 } 5380 } 5381 5382 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, 5383 struct nft_set_elem_expr *elem_expr) 5384 { 5385 struct nft_expr *expr; 5386 u32 size; 5387 5388 nft_setelem_expr_foreach(expr, elem_expr, size) 5389 __nft_set_elem_expr_destroy(ctx, expr); 5390 } 5391 5392 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 5393 bool destroy_expr) 5394 { 5395 struct nft_set_ext *ext = nft_set_elem_ext(set, elem); 5396 struct nft_ctx ctx = { 5397 .net = read_pnet(&set->net), 5398 .family = set->table->family, 5399 }; 5400 5401 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); 5402 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 5403 nft_data_release(nft_set_ext_data(ext), set->dtype); 5404 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) 5405 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext)); 5406 5407 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 5408 (*nft_set_ext_obj(ext))->use--; 5409 kfree(elem); 5410 } 5411 EXPORT_SYMBOL_GPL(nft_set_elem_destroy); 5412 5413 /* Only called from commit path, nft_setelem_data_deactivate() already deals 5414 * with the refcounting from the preparation phase. 5415 */ 5416 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, 5417 const struct nft_set *set, void *elem) 5418 { 5419 struct nft_set_ext *ext = nft_set_elem_ext(set, elem); 5420 5421 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) 5422 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext)); 5423 5424 kfree(elem); 5425 } 5426 5427 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 5428 struct nft_expr *expr_array[]) 5429 { 5430 struct nft_expr *expr; 5431 int err, i, k; 5432 5433 for (i = 0; i < set->num_exprs; i++) { 5434 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL); 5435 if (!expr) 5436 goto err_expr; 5437 5438 err = nft_expr_clone(expr, set->exprs[i]); 5439 if (err < 0) { 5440 nft_expr_destroy(ctx, expr); 5441 goto err_expr; 5442 } 5443 expr_array[i] = expr; 5444 } 5445 5446 return 0; 5447 5448 err_expr: 5449 for (k = i - 1; k >= 0; k--) 5450 nft_expr_destroy(ctx, expr_array[k]); 5451 5452 return -ENOMEM; 5453 } 5454 5455 static int nft_set_elem_expr_setup(struct nft_ctx *ctx, 5456 const struct nft_set_ext *ext, 5457 struct nft_expr *expr_array[], 5458 u32 num_exprs) 5459 { 5460 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext); 5461 struct nft_expr *expr; 5462 int i, err; 5463 5464 for (i = 0; i < num_exprs; i++) { 5465 expr = nft_setelem_expr_at(elem_expr, elem_expr->size); 5466 err = nft_expr_clone(expr, expr_array[i]); 5467 if (err < 0) 5468 goto err_elem_expr_setup; 5469 5470 elem_expr->size += expr_array[i]->ops->size; 5471 nft_expr_destroy(ctx, expr_array[i]); 5472 expr_array[i] = NULL; 5473 } 5474 5475 return 0; 5476 5477 err_elem_expr_setup: 5478 for (; i < num_exprs; i++) { 5479 nft_expr_destroy(ctx, expr_array[i]); 5480 expr_array[i] = NULL; 5481 } 5482 5483 return -ENOMEM; 5484 } 5485 5486 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 5487 const struct nft_set *set) 5488 { 5489 struct nft_set_elem_catchall *catchall; 5490 u8 genmask = nft_genmask_cur(net); 5491 struct nft_set_ext *ext; 5492 5493 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5494 ext = nft_set_elem_ext(set, catchall->elem); 5495 if (nft_set_elem_active(ext, genmask) && 5496 !nft_set_elem_expired(ext)) 5497 return ext; 5498 } 5499 5500 return NULL; 5501 } 5502 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup); 5503 5504 void *nft_set_catchall_gc(const struct nft_set *set) 5505 { 5506 struct nft_set_elem_catchall *catchall, *next; 5507 struct nft_set_ext *ext; 5508 void *elem = NULL; 5509 5510 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 5511 ext = nft_set_elem_ext(set, catchall->elem); 5512 5513 if (!nft_set_elem_expired(ext) || 5514 nft_set_elem_mark_busy(ext)) 5515 continue; 5516 5517 elem = catchall->elem; 5518 list_del_rcu(&catchall->list); 5519 kfree_rcu(catchall, rcu); 5520 break; 5521 } 5522 5523 return elem; 5524 } 5525 EXPORT_SYMBOL_GPL(nft_set_catchall_gc); 5526 5527 static int nft_setelem_catchall_insert(const struct net *net, 5528 struct nft_set *set, 5529 const struct nft_set_elem *elem, 5530 struct nft_set_ext **pext) 5531 { 5532 struct nft_set_elem_catchall *catchall; 5533 u8 genmask = nft_genmask_next(net); 5534 struct nft_set_ext *ext; 5535 5536 list_for_each_entry(catchall, &set->catchall_list, list) { 5537 ext = nft_set_elem_ext(set, catchall->elem); 5538 if (nft_set_elem_active(ext, genmask)) { 5539 *pext = ext; 5540 return -EEXIST; 5541 } 5542 } 5543 5544 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL); 5545 if (!catchall) 5546 return -ENOMEM; 5547 5548 catchall->elem = elem->priv; 5549 list_add_tail_rcu(&catchall->list, &set->catchall_list); 5550 5551 return 0; 5552 } 5553 5554 static int nft_setelem_insert(const struct net *net, 5555 struct nft_set *set, 5556 const struct nft_set_elem *elem, 5557 struct nft_set_ext **ext, unsigned int flags) 5558 { 5559 int ret; 5560 5561 if (flags & NFT_SET_ELEM_CATCHALL) 5562 ret = nft_setelem_catchall_insert(net, set, elem, ext); 5563 else 5564 ret = set->ops->insert(net, set, elem, ext); 5565 5566 return ret; 5567 } 5568 5569 static bool nft_setelem_is_catchall(const struct nft_set *set, 5570 const struct nft_set_elem *elem) 5571 { 5572 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 5573 5574 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 5575 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL) 5576 return true; 5577 5578 return false; 5579 } 5580 5581 static void nft_setelem_activate(struct net *net, struct nft_set *set, 5582 struct nft_set_elem *elem) 5583 { 5584 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 5585 5586 if (nft_setelem_is_catchall(set, elem)) { 5587 nft_set_elem_change_active(net, set, ext); 5588 nft_set_elem_clear_busy(ext); 5589 } else { 5590 set->ops->activate(net, set, elem); 5591 } 5592 } 5593 5594 static int nft_setelem_catchall_deactivate(const struct net *net, 5595 struct nft_set *set, 5596 struct nft_set_elem *elem) 5597 { 5598 struct nft_set_elem_catchall *catchall; 5599 struct nft_set_ext *ext; 5600 5601 list_for_each_entry(catchall, &set->catchall_list, list) { 5602 ext = nft_set_elem_ext(set, catchall->elem); 5603 if (!nft_is_active(net, ext) || 5604 nft_set_elem_mark_busy(ext)) 5605 continue; 5606 5607 kfree(elem->priv); 5608 elem->priv = catchall->elem; 5609 nft_set_elem_change_active(net, set, ext); 5610 return 0; 5611 } 5612 5613 return -ENOENT; 5614 } 5615 5616 static int __nft_setelem_deactivate(const struct net *net, 5617 struct nft_set *set, 5618 struct nft_set_elem *elem) 5619 { 5620 void *priv; 5621 5622 priv = set->ops->deactivate(net, set, elem); 5623 if (!priv) 5624 return -ENOENT; 5625 5626 kfree(elem->priv); 5627 elem->priv = priv; 5628 set->ndeact++; 5629 5630 return 0; 5631 } 5632 5633 static int nft_setelem_deactivate(const struct net *net, 5634 struct nft_set *set, 5635 struct nft_set_elem *elem, u32 flags) 5636 { 5637 int ret; 5638 5639 if (flags & NFT_SET_ELEM_CATCHALL) 5640 ret = nft_setelem_catchall_deactivate(net, set, elem); 5641 else 5642 ret = __nft_setelem_deactivate(net, set, elem); 5643 5644 return ret; 5645 } 5646 5647 static void nft_setelem_catchall_remove(const struct net *net, 5648 const struct nft_set *set, 5649 const struct nft_set_elem *elem) 5650 { 5651 struct nft_set_elem_catchall *catchall, *next; 5652 5653 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 5654 if (catchall->elem == elem->priv) { 5655 list_del_rcu(&catchall->list); 5656 kfree_rcu(catchall); 5657 break; 5658 } 5659 } 5660 } 5661 5662 static void nft_setelem_remove(const struct net *net, 5663 const struct nft_set *set, 5664 const struct nft_set_elem *elem) 5665 { 5666 if (nft_setelem_is_catchall(set, elem)) 5667 nft_setelem_catchall_remove(net, set, elem); 5668 else 5669 set->ops->remove(net, set, elem); 5670 } 5671 5672 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, 5673 const struct nlattr *attr, u32 nlmsg_flags) 5674 { 5675 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {}; 5676 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 5677 u8 genmask = nft_genmask_next(ctx->net); 5678 u32 flags = 0, size = 0, num_exprs = 0; 5679 struct nft_set_ext_tmpl tmpl; 5680 struct nft_set_ext *ext, *ext2; 5681 struct nft_set_elem elem; 5682 struct nft_set_binding *binding; 5683 struct nft_object *obj = NULL; 5684 struct nft_userdata *udata; 5685 struct nft_data_desc desc; 5686 enum nft_registers dreg; 5687 struct nft_trans *trans; 5688 u64 timeout; 5689 u64 expiration; 5690 int err, i; 5691 u8 ulen; 5692 5693 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 5694 nft_set_elem_policy, NULL); 5695 if (err < 0) 5696 return err; 5697 5698 nft_set_ext_prepare(&tmpl); 5699 5700 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 5701 if (err < 0) 5702 return err; 5703 5704 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 5705 return -EINVAL; 5706 5707 if (flags != 0) 5708 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); 5709 5710 if (set->flags & NFT_SET_MAP) { 5711 if (nla[NFTA_SET_ELEM_DATA] == NULL && 5712 !(flags & NFT_SET_ELEM_INTERVAL_END)) 5713 return -EINVAL; 5714 } else { 5715 if (nla[NFTA_SET_ELEM_DATA] != NULL) 5716 return -EINVAL; 5717 } 5718 5719 if ((flags & NFT_SET_ELEM_INTERVAL_END) && 5720 (nla[NFTA_SET_ELEM_DATA] || 5721 nla[NFTA_SET_ELEM_OBJREF] || 5722 nla[NFTA_SET_ELEM_TIMEOUT] || 5723 nla[NFTA_SET_ELEM_EXPIRATION] || 5724 nla[NFTA_SET_ELEM_USERDATA] || 5725 nla[NFTA_SET_ELEM_EXPR] || 5726 nla[NFTA_SET_ELEM_EXPRESSIONS])) 5727 return -EINVAL; 5728 5729 timeout = 0; 5730 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { 5731 if (!(set->flags & NFT_SET_TIMEOUT)) 5732 return -EINVAL; 5733 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT], 5734 &timeout); 5735 if (err) 5736 return err; 5737 } else if (set->flags & NFT_SET_TIMEOUT) { 5738 timeout = set->timeout; 5739 } 5740 5741 expiration = 0; 5742 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) { 5743 if (!(set->flags & NFT_SET_TIMEOUT)) 5744 return -EINVAL; 5745 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION], 5746 &expiration); 5747 if (err) 5748 return err; 5749 } 5750 5751 if (nla[NFTA_SET_ELEM_EXPR]) { 5752 struct nft_expr *expr; 5753 5754 if (set->num_exprs && set->num_exprs != 1) 5755 return -EOPNOTSUPP; 5756 5757 expr = nft_set_elem_expr_alloc(ctx, set, 5758 nla[NFTA_SET_ELEM_EXPR]); 5759 if (IS_ERR(expr)) 5760 return PTR_ERR(expr); 5761 5762 expr_array[0] = expr; 5763 num_exprs = 1; 5764 5765 if (set->num_exprs && set->exprs[0]->ops != expr->ops) { 5766 err = -EOPNOTSUPP; 5767 goto err_set_elem_expr; 5768 } 5769 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) { 5770 struct nft_expr *expr; 5771 struct nlattr *tmp; 5772 int left; 5773 5774 i = 0; 5775 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) { 5776 if (i == NFT_SET_EXPR_MAX || 5777 (set->num_exprs && set->num_exprs == i)) { 5778 err = -E2BIG; 5779 goto err_set_elem_expr; 5780 } 5781 if (nla_type(tmp) != NFTA_LIST_ELEM) { 5782 err = -EINVAL; 5783 goto err_set_elem_expr; 5784 } 5785 expr = nft_set_elem_expr_alloc(ctx, set, tmp); 5786 if (IS_ERR(expr)) { 5787 err = PTR_ERR(expr); 5788 goto err_set_elem_expr; 5789 } 5790 expr_array[i] = expr; 5791 num_exprs++; 5792 5793 if (set->num_exprs && expr->ops != set->exprs[i]->ops) { 5794 err = -EOPNOTSUPP; 5795 goto err_set_elem_expr; 5796 } 5797 i++; 5798 } 5799 if (set->num_exprs && set->num_exprs != i) { 5800 err = -EOPNOTSUPP; 5801 goto err_set_elem_expr; 5802 } 5803 } else if (set->num_exprs > 0) { 5804 err = nft_set_elem_expr_clone(ctx, set, expr_array); 5805 if (err < 0) 5806 goto err_set_elem_expr_clone; 5807 5808 num_exprs = set->num_exprs; 5809 } 5810 5811 if (nla[NFTA_SET_ELEM_KEY]) { 5812 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 5813 nla[NFTA_SET_ELEM_KEY]); 5814 if (err < 0) 5815 goto err_set_elem_expr; 5816 5817 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen); 5818 } 5819 5820 if (nla[NFTA_SET_ELEM_KEY_END]) { 5821 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 5822 nla[NFTA_SET_ELEM_KEY_END]); 5823 if (err < 0) 5824 goto err_parse_key; 5825 5826 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen); 5827 } 5828 5829 if (timeout > 0) { 5830 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); 5831 if (timeout != set->timeout) 5832 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); 5833 } 5834 5835 if (num_exprs) { 5836 for (i = 0; i < num_exprs; i++) 5837 size += expr_array[i]->ops->size; 5838 5839 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS, 5840 sizeof(struct nft_set_elem_expr) + 5841 size); 5842 } 5843 5844 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { 5845 if (!(set->flags & NFT_SET_OBJECT)) { 5846 err = -EINVAL; 5847 goto err_parse_key_end; 5848 } 5849 obj = nft_obj_lookup(ctx->net, ctx->table, 5850 nla[NFTA_SET_ELEM_OBJREF], 5851 set->objtype, genmask); 5852 if (IS_ERR(obj)) { 5853 err = PTR_ERR(obj); 5854 goto err_parse_key_end; 5855 } 5856 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); 5857 } 5858 5859 if (nla[NFTA_SET_ELEM_DATA] != NULL) { 5860 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val, 5861 nla[NFTA_SET_ELEM_DATA]); 5862 if (err < 0) 5863 goto err_parse_key_end; 5864 5865 dreg = nft_type_to_reg(set->dtype); 5866 list_for_each_entry(binding, &set->bindings, list) { 5867 struct nft_ctx bind_ctx = { 5868 .net = ctx->net, 5869 .family = ctx->family, 5870 .table = ctx->table, 5871 .chain = (struct nft_chain *)binding->chain, 5872 }; 5873 5874 if (!(binding->flags & NFT_SET_MAP)) 5875 continue; 5876 5877 err = nft_validate_register_store(&bind_ctx, dreg, 5878 &elem.data.val, 5879 desc.type, desc.len); 5880 if (err < 0) 5881 goto err_parse_data; 5882 5883 if (desc.type == NFT_DATA_VERDICT && 5884 (elem.data.val.verdict.code == NFT_GOTO || 5885 elem.data.val.verdict.code == NFT_JUMP)) 5886 nft_validate_state_update(ctx->net, 5887 NFT_VALIDATE_NEED); 5888 } 5889 5890 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len); 5891 } 5892 5893 /* The full maximum length of userdata can exceed the maximum 5894 * offset value (U8_MAX) for following extensions, therefor it 5895 * must be the last extension added. 5896 */ 5897 ulen = 0; 5898 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { 5899 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); 5900 if (ulen > 0) 5901 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, 5902 ulen); 5903 } 5904 5905 err = -ENOMEM; 5906 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, 5907 elem.key_end.val.data, elem.data.val.data, 5908 timeout, expiration, GFP_KERNEL); 5909 if (elem.priv == NULL) 5910 goto err_parse_data; 5911 5912 ext = nft_set_elem_ext(set, elem.priv); 5913 if (flags) 5914 *nft_set_ext_flags(ext) = flags; 5915 if (ulen > 0) { 5916 udata = nft_set_ext_userdata(ext); 5917 udata->len = ulen - 1; 5918 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); 5919 } 5920 if (obj) { 5921 *nft_set_ext_obj(ext) = obj; 5922 obj->use++; 5923 } 5924 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs); 5925 if (err < 0) 5926 goto err_elem_expr; 5927 5928 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); 5929 if (trans == NULL) { 5930 err = -ENOMEM; 5931 goto err_elem_expr; 5932 } 5933 5934 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; 5935 5936 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags); 5937 if (err) { 5938 if (err == -EEXIST) { 5939 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ 5940 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || 5941 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ 5942 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) 5943 goto err_element_clash; 5944 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 5945 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && 5946 memcmp(nft_set_ext_data(ext), 5947 nft_set_ext_data(ext2), set->dlen) != 0) || 5948 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && 5949 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && 5950 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) 5951 goto err_element_clash; 5952 else if (!(nlmsg_flags & NLM_F_EXCL)) 5953 err = 0; 5954 } else if (err == -ENOTEMPTY) { 5955 /* ENOTEMPTY reports overlapping between this element 5956 * and an existing one. 5957 */ 5958 err = -EEXIST; 5959 } 5960 goto err_element_clash; 5961 } 5962 5963 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size && 5964 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { 5965 err = -ENFILE; 5966 goto err_set_full; 5967 } 5968 5969 nft_trans_elem(trans) = elem; 5970 nft_trans_commit_list_add_tail(ctx->net, trans); 5971 return 0; 5972 5973 err_set_full: 5974 nft_setelem_remove(ctx->net, set, &elem); 5975 err_element_clash: 5976 kfree(trans); 5977 err_elem_expr: 5978 if (obj) 5979 obj->use--; 5980 5981 nf_tables_set_elem_destroy(ctx, set, elem.priv); 5982 err_parse_data: 5983 if (nla[NFTA_SET_ELEM_DATA] != NULL) 5984 nft_data_release(&elem.data.val, desc.type); 5985 err_parse_key_end: 5986 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE); 5987 err_parse_key: 5988 nft_data_release(&elem.key.val, NFT_DATA_VALUE); 5989 err_set_elem_expr: 5990 for (i = 0; i < num_exprs && expr_array[i]; i++) 5991 nft_expr_destroy(ctx, expr_array[i]); 5992 err_set_elem_expr_clone: 5993 return err; 5994 } 5995 5996 static int nf_tables_newsetelem(struct sk_buff *skb, 5997 const struct nfnl_info *info, 5998 const struct nlattr * const nla[]) 5999 { 6000 struct nftables_pernet *nft_net = nft_pernet(info->net); 6001 struct netlink_ext_ack *extack = info->extack; 6002 u8 genmask = nft_genmask_next(info->net); 6003 u8 family = info->nfmsg->nfgen_family; 6004 struct net *net = info->net; 6005 const struct nlattr *attr; 6006 struct nft_table *table; 6007 struct nft_set *set; 6008 struct nft_ctx ctx; 6009 int rem, err; 6010 6011 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) 6012 return -EINVAL; 6013 6014 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 6015 genmask, NETLINK_CB(skb).portid); 6016 if (IS_ERR(table)) { 6017 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 6018 return PTR_ERR(table); 6019 } 6020 6021 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET], 6022 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask); 6023 if (IS_ERR(set)) 6024 return PTR_ERR(set); 6025 6026 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) 6027 return -EBUSY; 6028 6029 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6030 6031 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 6032 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags); 6033 if (err < 0) 6034 return err; 6035 } 6036 6037 if (nft_net->validate_state == NFT_VALIDATE_DO) 6038 return nft_table_validate(net, table); 6039 6040 return 0; 6041 } 6042 6043 /** 6044 * nft_data_hold - hold a nft_data item 6045 * 6046 * @data: struct nft_data to release 6047 * @type: type of data 6048 * 6049 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, 6050 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and 6051 * NFT_GOTO verdicts. This function must be called on active data objects 6052 * from the second phase of the commit protocol. 6053 */ 6054 void nft_data_hold(const struct nft_data *data, enum nft_data_types type) 6055 { 6056 struct nft_chain *chain; 6057 struct nft_rule *rule; 6058 6059 if (type == NFT_DATA_VERDICT) { 6060 switch (data->verdict.code) { 6061 case NFT_JUMP: 6062 case NFT_GOTO: 6063 chain = data->verdict.chain; 6064 chain->use++; 6065 6066 if (!nft_chain_is_bound(chain)) 6067 break; 6068 6069 chain->table->use++; 6070 list_for_each_entry(rule, &chain->rules, list) 6071 chain->use++; 6072 6073 nft_chain_add(chain->table, chain); 6074 break; 6075 } 6076 } 6077 } 6078 6079 static void nft_setelem_data_activate(const struct net *net, 6080 const struct nft_set *set, 6081 struct nft_set_elem *elem) 6082 { 6083 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 6084 6085 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 6086 nft_data_hold(nft_set_ext_data(ext), set->dtype); 6087 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 6088 (*nft_set_ext_obj(ext))->use++; 6089 } 6090 6091 static void nft_setelem_data_deactivate(const struct net *net, 6092 const struct nft_set *set, 6093 struct nft_set_elem *elem) 6094 { 6095 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 6096 6097 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 6098 nft_data_release(nft_set_ext_data(ext), set->dtype); 6099 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 6100 (*nft_set_ext_obj(ext))->use--; 6101 } 6102 6103 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, 6104 const struct nlattr *attr) 6105 { 6106 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 6107 struct nft_set_ext_tmpl tmpl; 6108 struct nft_set_elem elem; 6109 struct nft_set_ext *ext; 6110 struct nft_trans *trans; 6111 u32 flags = 0; 6112 int err; 6113 6114 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 6115 nft_set_elem_policy, NULL); 6116 if (err < 0) 6117 return err; 6118 6119 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 6120 if (err < 0) 6121 return err; 6122 6123 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 6124 return -EINVAL; 6125 6126 nft_set_ext_prepare(&tmpl); 6127 6128 if (flags != 0) 6129 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); 6130 6131 if (nla[NFTA_SET_ELEM_KEY]) { 6132 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 6133 nla[NFTA_SET_ELEM_KEY]); 6134 if (err < 0) 6135 return err; 6136 6137 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen); 6138 } 6139 6140 if (nla[NFTA_SET_ELEM_KEY_END]) { 6141 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 6142 nla[NFTA_SET_ELEM_KEY_END]); 6143 if (err < 0) 6144 return err; 6145 6146 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen); 6147 } 6148 6149 err = -ENOMEM; 6150 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, 6151 elem.key_end.val.data, NULL, 0, 0, 6152 GFP_KERNEL); 6153 if (elem.priv == NULL) 6154 goto fail_elem; 6155 6156 ext = nft_set_elem_ext(set, elem.priv); 6157 if (flags) 6158 *nft_set_ext_flags(ext) = flags; 6159 6160 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); 6161 if (trans == NULL) 6162 goto fail_trans; 6163 6164 err = nft_setelem_deactivate(ctx->net, set, &elem, flags); 6165 if (err < 0) 6166 goto fail_ops; 6167 6168 nft_setelem_data_deactivate(ctx->net, set, &elem); 6169 6170 nft_trans_elem(trans) = elem; 6171 nft_trans_commit_list_add_tail(ctx->net, trans); 6172 return 0; 6173 6174 fail_ops: 6175 kfree(trans); 6176 fail_trans: 6177 kfree(elem.priv); 6178 fail_elem: 6179 nft_data_release(&elem.key.val, NFT_DATA_VALUE); 6180 return err; 6181 } 6182 6183 static int nft_setelem_flush(const struct nft_ctx *ctx, 6184 struct nft_set *set, 6185 const struct nft_set_iter *iter, 6186 struct nft_set_elem *elem) 6187 { 6188 struct nft_trans *trans; 6189 int err; 6190 6191 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, 6192 sizeof(struct nft_trans_elem), GFP_ATOMIC); 6193 if (!trans) 6194 return -ENOMEM; 6195 6196 if (!set->ops->flush(ctx->net, set, elem->priv)) { 6197 err = -ENOENT; 6198 goto err1; 6199 } 6200 set->ndeact++; 6201 6202 nft_setelem_data_deactivate(ctx->net, set, elem); 6203 nft_trans_elem_set(trans) = set; 6204 nft_trans_elem(trans) = *elem; 6205 nft_trans_commit_list_add_tail(ctx->net, trans); 6206 6207 return 0; 6208 err1: 6209 kfree(trans); 6210 return err; 6211 } 6212 6213 static int __nft_set_catchall_flush(const struct nft_ctx *ctx, 6214 struct nft_set *set, 6215 struct nft_set_elem *elem) 6216 { 6217 struct nft_trans *trans; 6218 6219 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, 6220 sizeof(struct nft_trans_elem), GFP_KERNEL); 6221 if (!trans) 6222 return -ENOMEM; 6223 6224 nft_setelem_data_deactivate(ctx->net, set, elem); 6225 nft_trans_elem_set(trans) = set; 6226 nft_trans_elem(trans) = *elem; 6227 nft_trans_commit_list_add_tail(ctx->net, trans); 6228 6229 return 0; 6230 } 6231 6232 static int nft_set_catchall_flush(const struct nft_ctx *ctx, 6233 struct nft_set *set) 6234 { 6235 u8 genmask = nft_genmask_next(ctx->net); 6236 struct nft_set_elem_catchall *catchall; 6237 struct nft_set_elem elem; 6238 struct nft_set_ext *ext; 6239 int ret = 0; 6240 6241 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 6242 ext = nft_set_elem_ext(set, catchall->elem); 6243 if (!nft_set_elem_active(ext, genmask) || 6244 nft_set_elem_mark_busy(ext)) 6245 continue; 6246 6247 elem.priv = catchall->elem; 6248 ret = __nft_set_catchall_flush(ctx, set, &elem); 6249 if (ret < 0) 6250 break; 6251 } 6252 6253 return ret; 6254 } 6255 6256 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask) 6257 { 6258 struct nft_set_iter iter = { 6259 .genmask = genmask, 6260 .fn = nft_setelem_flush, 6261 }; 6262 6263 set->ops->walk(ctx, set, &iter); 6264 if (!iter.err) 6265 iter.err = nft_set_catchall_flush(ctx, set); 6266 6267 return iter.err; 6268 } 6269 6270 static int nf_tables_delsetelem(struct sk_buff *skb, 6271 const struct nfnl_info *info, 6272 const struct nlattr * const nla[]) 6273 { 6274 struct netlink_ext_ack *extack = info->extack; 6275 u8 genmask = nft_genmask_next(info->net); 6276 u8 family = info->nfmsg->nfgen_family; 6277 struct net *net = info->net; 6278 const struct nlattr *attr; 6279 struct nft_table *table; 6280 struct nft_set *set; 6281 struct nft_ctx ctx; 6282 int rem, err = 0; 6283 6284 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 6285 genmask, NETLINK_CB(skb).portid); 6286 if (IS_ERR(table)) { 6287 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 6288 return PTR_ERR(table); 6289 } 6290 6291 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask); 6292 if (IS_ERR(set)) 6293 return PTR_ERR(set); 6294 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) 6295 return -EBUSY; 6296 6297 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6298 6299 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) 6300 return nft_set_flush(&ctx, set, genmask); 6301 6302 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 6303 err = nft_del_setelem(&ctx, set, attr); 6304 if (err < 0) 6305 break; 6306 } 6307 return err; 6308 } 6309 6310 void nft_set_gc_batch_release(struct rcu_head *rcu) 6311 { 6312 struct nft_set_gc_batch *gcb; 6313 unsigned int i; 6314 6315 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); 6316 for (i = 0; i < gcb->head.cnt; i++) 6317 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); 6318 kfree(gcb); 6319 } 6320 6321 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 6322 gfp_t gfp) 6323 { 6324 struct nft_set_gc_batch *gcb; 6325 6326 gcb = kzalloc(sizeof(*gcb), gfp); 6327 if (gcb == NULL) 6328 return gcb; 6329 gcb->head.set = set; 6330 return gcb; 6331 } 6332 6333 /* 6334 * Stateful objects 6335 */ 6336 6337 /** 6338 * nft_register_obj- register nf_tables stateful object type 6339 * @obj_type: object type 6340 * 6341 * Registers the object type for use with nf_tables. Returns zero on 6342 * success or a negative errno code otherwise. 6343 */ 6344 int nft_register_obj(struct nft_object_type *obj_type) 6345 { 6346 if (obj_type->type == NFT_OBJECT_UNSPEC) 6347 return -EINVAL; 6348 6349 nfnl_lock(NFNL_SUBSYS_NFTABLES); 6350 list_add_rcu(&obj_type->list, &nf_tables_objects); 6351 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 6352 return 0; 6353 } 6354 EXPORT_SYMBOL_GPL(nft_register_obj); 6355 6356 /** 6357 * nft_unregister_obj - unregister nf_tables object type 6358 * @obj_type: object type 6359 * 6360 * Unregisters the object type for use with nf_tables. 6361 */ 6362 void nft_unregister_obj(struct nft_object_type *obj_type) 6363 { 6364 nfnl_lock(NFNL_SUBSYS_NFTABLES); 6365 list_del_rcu(&obj_type->list); 6366 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 6367 } 6368 EXPORT_SYMBOL_GPL(nft_unregister_obj); 6369 6370 struct nft_object *nft_obj_lookup(const struct net *net, 6371 const struct nft_table *table, 6372 const struct nlattr *nla, u32 objtype, 6373 u8 genmask) 6374 { 6375 struct nft_object_hash_key k = { .table = table }; 6376 char search[NFT_OBJ_MAXNAMELEN]; 6377 struct rhlist_head *tmp, *list; 6378 struct nft_object *obj; 6379 6380 nla_strscpy(search, nla, sizeof(search)); 6381 k.name = search; 6382 6383 WARN_ON_ONCE(!rcu_read_lock_held() && 6384 !lockdep_commit_lock_is_held(net)); 6385 6386 rcu_read_lock(); 6387 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params); 6388 if (!list) 6389 goto out; 6390 6391 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) { 6392 if (objtype == obj->ops->type->type && 6393 nft_active_genmask(obj, genmask)) { 6394 rcu_read_unlock(); 6395 return obj; 6396 } 6397 } 6398 out: 6399 rcu_read_unlock(); 6400 return ERR_PTR(-ENOENT); 6401 } 6402 EXPORT_SYMBOL_GPL(nft_obj_lookup); 6403 6404 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table, 6405 const struct nlattr *nla, 6406 u32 objtype, u8 genmask) 6407 { 6408 struct nft_object *obj; 6409 6410 list_for_each_entry(obj, &table->objects, list) { 6411 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle && 6412 objtype == obj->ops->type->type && 6413 nft_active_genmask(obj, genmask)) 6414 return obj; 6415 } 6416 return ERR_PTR(-ENOENT); 6417 } 6418 6419 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { 6420 [NFTA_OBJ_TABLE] = { .type = NLA_STRING, 6421 .len = NFT_TABLE_MAXNAMELEN - 1 }, 6422 [NFTA_OBJ_NAME] = { .type = NLA_STRING, 6423 .len = NFT_OBJ_MAXNAMELEN - 1 }, 6424 [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, 6425 [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, 6426 [NFTA_OBJ_HANDLE] = { .type = NLA_U64}, 6427 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY, 6428 .len = NFT_USERDATA_MAXLEN }, 6429 }; 6430 6431 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, 6432 const struct nft_object_type *type, 6433 const struct nlattr *attr) 6434 { 6435 struct nlattr **tb; 6436 const struct nft_object_ops *ops; 6437 struct nft_object *obj; 6438 int err = -ENOMEM; 6439 6440 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL); 6441 if (!tb) 6442 goto err1; 6443 6444 if (attr) { 6445 err = nla_parse_nested_deprecated(tb, type->maxattr, attr, 6446 type->policy, NULL); 6447 if (err < 0) 6448 goto err2; 6449 } else { 6450 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); 6451 } 6452 6453 if (type->select_ops) { 6454 ops = type->select_ops(ctx, (const struct nlattr * const *)tb); 6455 if (IS_ERR(ops)) { 6456 err = PTR_ERR(ops); 6457 goto err2; 6458 } 6459 } else { 6460 ops = type->ops; 6461 } 6462 6463 err = -ENOMEM; 6464 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL); 6465 if (!obj) 6466 goto err2; 6467 6468 err = ops->init(ctx, (const struct nlattr * const *)tb, obj); 6469 if (err < 0) 6470 goto err3; 6471 6472 obj->ops = ops; 6473 6474 kfree(tb); 6475 return obj; 6476 err3: 6477 kfree(obj); 6478 err2: 6479 kfree(tb); 6480 err1: 6481 return ERR_PTR(err); 6482 } 6483 6484 static int nft_object_dump(struct sk_buff *skb, unsigned int attr, 6485 struct nft_object *obj, bool reset) 6486 { 6487 struct nlattr *nest; 6488 6489 nest = nla_nest_start_noflag(skb, attr); 6490 if (!nest) 6491 goto nla_put_failure; 6492 if (obj->ops->dump(skb, obj, reset) < 0) 6493 goto nla_put_failure; 6494 nla_nest_end(skb, nest); 6495 return 0; 6496 6497 nla_put_failure: 6498 return -1; 6499 } 6500 6501 static const struct nft_object_type *__nft_obj_type_get(u32 objtype) 6502 { 6503 const struct nft_object_type *type; 6504 6505 list_for_each_entry(type, &nf_tables_objects, list) { 6506 if (objtype == type->type) 6507 return type; 6508 } 6509 return NULL; 6510 } 6511 6512 static const struct nft_object_type * 6513 nft_obj_type_get(struct net *net, u32 objtype) 6514 { 6515 const struct nft_object_type *type; 6516 6517 type = __nft_obj_type_get(objtype); 6518 if (type != NULL && try_module_get(type->owner)) 6519 return type; 6520 6521 lockdep_nfnl_nft_mutex_not_held(); 6522 #ifdef CONFIG_MODULES 6523 if (type == NULL) { 6524 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN) 6525 return ERR_PTR(-EAGAIN); 6526 } 6527 #endif 6528 return ERR_PTR(-ENOENT); 6529 } 6530 6531 static int nf_tables_updobj(const struct nft_ctx *ctx, 6532 const struct nft_object_type *type, 6533 const struct nlattr *attr, 6534 struct nft_object *obj) 6535 { 6536 struct nft_object *newobj; 6537 struct nft_trans *trans; 6538 int err; 6539 6540 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ, 6541 sizeof(struct nft_trans_obj)); 6542 if (!trans) 6543 return -ENOMEM; 6544 6545 newobj = nft_obj_init(ctx, type, attr); 6546 if (IS_ERR(newobj)) { 6547 err = PTR_ERR(newobj); 6548 goto err_free_trans; 6549 } 6550 6551 nft_trans_obj(trans) = obj; 6552 nft_trans_obj_update(trans) = true; 6553 nft_trans_obj_newobj(trans) = newobj; 6554 nft_trans_commit_list_add_tail(ctx->net, trans); 6555 6556 return 0; 6557 6558 err_free_trans: 6559 kfree(trans); 6560 return err; 6561 } 6562 6563 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info, 6564 const struct nlattr * const nla[]) 6565 { 6566 struct netlink_ext_ack *extack = info->extack; 6567 u8 genmask = nft_genmask_next(info->net); 6568 u8 family = info->nfmsg->nfgen_family; 6569 const struct nft_object_type *type; 6570 struct net *net = info->net; 6571 struct nft_table *table; 6572 struct nft_object *obj; 6573 struct nft_ctx ctx; 6574 u32 objtype; 6575 int err; 6576 6577 if (!nla[NFTA_OBJ_TYPE] || 6578 !nla[NFTA_OBJ_NAME] || 6579 !nla[NFTA_OBJ_DATA]) 6580 return -EINVAL; 6581 6582 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 6583 NETLINK_CB(skb).portid); 6584 if (IS_ERR(table)) { 6585 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 6586 return PTR_ERR(table); 6587 } 6588 6589 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6590 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask); 6591 if (IS_ERR(obj)) { 6592 err = PTR_ERR(obj); 6593 if (err != -ENOENT) { 6594 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6595 return err; 6596 } 6597 } else { 6598 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 6599 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6600 return -EEXIST; 6601 } 6602 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 6603 return -EOPNOTSUPP; 6604 6605 type = __nft_obj_type_get(objtype); 6606 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6607 6608 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj); 6609 } 6610 6611 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6612 6613 type = nft_obj_type_get(net, objtype); 6614 if (IS_ERR(type)) 6615 return PTR_ERR(type); 6616 6617 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); 6618 if (IS_ERR(obj)) { 6619 err = PTR_ERR(obj); 6620 goto err_init; 6621 } 6622 obj->key.table = table; 6623 obj->handle = nf_tables_alloc_handle(table); 6624 6625 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL); 6626 if (!obj->key.name) { 6627 err = -ENOMEM; 6628 goto err_strdup; 6629 } 6630 6631 if (nla[NFTA_OBJ_USERDATA]) { 6632 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL); 6633 if (obj->udata == NULL) 6634 goto err_userdata; 6635 6636 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]); 6637 } 6638 6639 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); 6640 if (err < 0) 6641 goto err_trans; 6642 6643 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead, 6644 nft_objname_ht_params); 6645 if (err < 0) 6646 goto err_obj_ht; 6647 6648 list_add_tail_rcu(&obj->list, &table->objects); 6649 table->use++; 6650 return 0; 6651 err_obj_ht: 6652 /* queued in transaction log */ 6653 INIT_LIST_HEAD(&obj->list); 6654 return err; 6655 err_trans: 6656 kfree(obj->udata); 6657 err_userdata: 6658 kfree(obj->key.name); 6659 err_strdup: 6660 if (obj->ops->destroy) 6661 obj->ops->destroy(&ctx, obj); 6662 kfree(obj); 6663 err_init: 6664 module_put(type->owner); 6665 return err; 6666 } 6667 6668 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, 6669 u32 portid, u32 seq, int event, u32 flags, 6670 int family, const struct nft_table *table, 6671 struct nft_object *obj, bool reset) 6672 { 6673 struct nlmsghdr *nlh; 6674 6675 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 6676 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 6677 NFNETLINK_V0, nft_base_seq(net)); 6678 if (!nlh) 6679 goto nla_put_failure; 6680 6681 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || 6682 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) || 6683 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || 6684 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || 6685 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) || 6686 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle), 6687 NFTA_OBJ_PAD)) 6688 goto nla_put_failure; 6689 6690 if (obj->udata && 6691 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata)) 6692 goto nla_put_failure; 6693 6694 nlmsg_end(skb, nlh); 6695 return 0; 6696 6697 nla_put_failure: 6698 nlmsg_trim(skb, nlh); 6699 return -1; 6700 } 6701 6702 struct nft_obj_filter { 6703 char *table; 6704 u32 type; 6705 }; 6706 6707 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) 6708 { 6709 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 6710 const struct nft_table *table; 6711 unsigned int idx = 0, s_idx = cb->args[0]; 6712 struct nft_obj_filter *filter = cb->data; 6713 struct net *net = sock_net(skb->sk); 6714 int family = nfmsg->nfgen_family; 6715 struct nftables_pernet *nft_net; 6716 struct nft_object *obj; 6717 bool reset = false; 6718 6719 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) 6720 reset = true; 6721 6722 rcu_read_lock(); 6723 nft_net = nft_pernet(net); 6724 cb->seq = nft_net->base_seq; 6725 6726 list_for_each_entry_rcu(table, &nft_net->tables, list) { 6727 if (family != NFPROTO_UNSPEC && family != table->family) 6728 continue; 6729 6730 list_for_each_entry_rcu(obj, &table->objects, list) { 6731 if (!nft_is_active(net, obj)) 6732 goto cont; 6733 if (idx < s_idx) 6734 goto cont; 6735 if (idx > s_idx) 6736 memset(&cb->args[1], 0, 6737 sizeof(cb->args) - sizeof(cb->args[0])); 6738 if (filter && filter->table && 6739 strcmp(filter->table, table->name)) 6740 goto cont; 6741 if (filter && 6742 filter->type != NFT_OBJECT_UNSPEC && 6743 obj->ops->type->type != filter->type) 6744 goto cont; 6745 if (reset) { 6746 char *buf = kasprintf(GFP_ATOMIC, 6747 "%s:%u", 6748 table->name, 6749 nft_net->base_seq); 6750 6751 audit_log_nfcfg(buf, 6752 family, 6753 obj->handle, 6754 AUDIT_NFT_OP_OBJ_RESET, 6755 GFP_ATOMIC); 6756 kfree(buf); 6757 } 6758 6759 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, 6760 cb->nlh->nlmsg_seq, 6761 NFT_MSG_NEWOBJ, 6762 NLM_F_MULTI | NLM_F_APPEND, 6763 table->family, table, 6764 obj, reset) < 0) 6765 goto done; 6766 6767 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 6768 cont: 6769 idx++; 6770 } 6771 } 6772 done: 6773 rcu_read_unlock(); 6774 6775 cb->args[0] = idx; 6776 return skb->len; 6777 } 6778 6779 static int nf_tables_dump_obj_start(struct netlink_callback *cb) 6780 { 6781 const struct nlattr * const *nla = cb->data; 6782 struct nft_obj_filter *filter = NULL; 6783 6784 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) { 6785 filter = kzalloc(sizeof(*filter), GFP_ATOMIC); 6786 if (!filter) 6787 return -ENOMEM; 6788 6789 if (nla[NFTA_OBJ_TABLE]) { 6790 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC); 6791 if (!filter->table) { 6792 kfree(filter); 6793 return -ENOMEM; 6794 } 6795 } 6796 6797 if (nla[NFTA_OBJ_TYPE]) 6798 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6799 } 6800 6801 cb->data = filter; 6802 return 0; 6803 } 6804 6805 static int nf_tables_dump_obj_done(struct netlink_callback *cb) 6806 { 6807 struct nft_obj_filter *filter = cb->data; 6808 6809 if (filter) { 6810 kfree(filter->table); 6811 kfree(filter); 6812 } 6813 6814 return 0; 6815 } 6816 6817 /* called with rcu_read_lock held */ 6818 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info, 6819 const struct nlattr * const nla[]) 6820 { 6821 struct netlink_ext_ack *extack = info->extack; 6822 u8 genmask = nft_genmask_cur(info->net); 6823 u8 family = info->nfmsg->nfgen_family; 6824 const struct nft_table *table; 6825 struct net *net = info->net; 6826 struct nft_object *obj; 6827 struct sk_buff *skb2; 6828 bool reset = false; 6829 u32 objtype; 6830 int err; 6831 6832 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 6833 struct netlink_dump_control c = { 6834 .start = nf_tables_dump_obj_start, 6835 .dump = nf_tables_dump_obj, 6836 .done = nf_tables_dump_obj_done, 6837 .module = THIS_MODULE, 6838 .data = (void *)nla, 6839 }; 6840 6841 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 6842 } 6843 6844 if (!nla[NFTA_OBJ_NAME] || 6845 !nla[NFTA_OBJ_TYPE]) 6846 return -EINVAL; 6847 6848 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0); 6849 if (IS_ERR(table)) { 6850 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 6851 return PTR_ERR(table); 6852 } 6853 6854 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6855 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask); 6856 if (IS_ERR(obj)) { 6857 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6858 return PTR_ERR(obj); 6859 } 6860 6861 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 6862 if (!skb2) 6863 return -ENOMEM; 6864 6865 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) 6866 reset = true; 6867 6868 if (reset) { 6869 const struct nftables_pernet *nft_net; 6870 char *buf; 6871 6872 nft_net = nft_pernet(net); 6873 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq); 6874 6875 audit_log_nfcfg(buf, 6876 family, 6877 obj->handle, 6878 AUDIT_NFT_OP_OBJ_RESET, 6879 GFP_ATOMIC); 6880 kfree(buf); 6881 } 6882 6883 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, 6884 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, 6885 family, table, obj, reset); 6886 if (err < 0) 6887 goto err_fill_obj_info; 6888 6889 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 6890 6891 err_fill_obj_info: 6892 kfree_skb(skb2); 6893 return err; 6894 } 6895 6896 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) 6897 { 6898 if (obj->ops->destroy) 6899 obj->ops->destroy(ctx, obj); 6900 6901 module_put(obj->ops->type->owner); 6902 kfree(obj->key.name); 6903 kfree(obj->udata); 6904 kfree(obj); 6905 } 6906 6907 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info, 6908 const struct nlattr * const nla[]) 6909 { 6910 struct netlink_ext_ack *extack = info->extack; 6911 u8 genmask = nft_genmask_next(info->net); 6912 u8 family = info->nfmsg->nfgen_family; 6913 struct net *net = info->net; 6914 const struct nlattr *attr; 6915 struct nft_table *table; 6916 struct nft_object *obj; 6917 struct nft_ctx ctx; 6918 u32 objtype; 6919 6920 if (!nla[NFTA_OBJ_TYPE] || 6921 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE])) 6922 return -EINVAL; 6923 6924 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 6925 NETLINK_CB(skb).portid); 6926 if (IS_ERR(table)) { 6927 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 6928 return PTR_ERR(table); 6929 } 6930 6931 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6932 if (nla[NFTA_OBJ_HANDLE]) { 6933 attr = nla[NFTA_OBJ_HANDLE]; 6934 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask); 6935 } else { 6936 attr = nla[NFTA_OBJ_NAME]; 6937 obj = nft_obj_lookup(net, table, attr, objtype, genmask); 6938 } 6939 6940 if (IS_ERR(obj)) { 6941 NL_SET_BAD_ATTR(extack, attr); 6942 return PTR_ERR(obj); 6943 } 6944 if (obj->use > 0) { 6945 NL_SET_BAD_ATTR(extack, attr); 6946 return -EBUSY; 6947 } 6948 6949 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6950 6951 return nft_delobj(&ctx, obj); 6952 } 6953 6954 void nft_obj_notify(struct net *net, const struct nft_table *table, 6955 struct nft_object *obj, u32 portid, u32 seq, int event, 6956 u16 flags, int family, int report, gfp_t gfp) 6957 { 6958 struct nftables_pernet *nft_net = nft_pernet(net); 6959 struct sk_buff *skb; 6960 int err; 6961 char *buf = kasprintf(gfp, "%s:%u", 6962 table->name, nft_net->base_seq); 6963 6964 audit_log_nfcfg(buf, 6965 family, 6966 obj->handle, 6967 event == NFT_MSG_NEWOBJ ? 6968 AUDIT_NFT_OP_OBJ_REGISTER : 6969 AUDIT_NFT_OP_OBJ_UNREGISTER, 6970 gfp); 6971 kfree(buf); 6972 6973 if (!report && 6974 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 6975 return; 6976 6977 skb = nlmsg_new(NLMSG_GOODSIZE, gfp); 6978 if (skb == NULL) 6979 goto err; 6980 6981 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 6982 flags & (NLM_F_CREATE | NLM_F_EXCL), 6983 family, table, obj, false); 6984 if (err < 0) { 6985 kfree_skb(skb); 6986 goto err; 6987 } 6988 6989 nft_notify_enqueue(skb, report, &nft_net->notify_list); 6990 return; 6991 err: 6992 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 6993 } 6994 EXPORT_SYMBOL_GPL(nft_obj_notify); 6995 6996 static void nf_tables_obj_notify(const struct nft_ctx *ctx, 6997 struct nft_object *obj, int event) 6998 { 6999 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, 7000 ctx->flags, ctx->family, ctx->report, GFP_KERNEL); 7001 } 7002 7003 /* 7004 * Flow tables 7005 */ 7006 void nft_register_flowtable_type(struct nf_flowtable_type *type) 7007 { 7008 nfnl_lock(NFNL_SUBSYS_NFTABLES); 7009 list_add_tail_rcu(&type->list, &nf_tables_flowtables); 7010 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 7011 } 7012 EXPORT_SYMBOL_GPL(nft_register_flowtable_type); 7013 7014 void nft_unregister_flowtable_type(struct nf_flowtable_type *type) 7015 { 7016 nfnl_lock(NFNL_SUBSYS_NFTABLES); 7017 list_del_rcu(&type->list); 7018 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 7019 } 7020 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); 7021 7022 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { 7023 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, 7024 .len = NFT_NAME_MAXLEN - 1 }, 7025 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, 7026 .len = NFT_NAME_MAXLEN - 1 }, 7027 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, 7028 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 }, 7029 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 }, 7030 }; 7031 7032 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 7033 const struct nlattr *nla, u8 genmask) 7034 { 7035 struct nft_flowtable *flowtable; 7036 7037 list_for_each_entry_rcu(flowtable, &table->flowtables, list) { 7038 if (!nla_strcmp(nla, flowtable->name) && 7039 nft_active_genmask(flowtable, genmask)) 7040 return flowtable; 7041 } 7042 return ERR_PTR(-ENOENT); 7043 } 7044 EXPORT_SYMBOL_GPL(nft_flowtable_lookup); 7045 7046 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 7047 struct nft_flowtable *flowtable, 7048 enum nft_trans_phase phase) 7049 { 7050 switch (phase) { 7051 case NFT_TRANS_PREPARE: 7052 case NFT_TRANS_ABORT: 7053 case NFT_TRANS_RELEASE: 7054 flowtable->use--; 7055 fallthrough; 7056 default: 7057 return; 7058 } 7059 } 7060 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable); 7061 7062 static struct nft_flowtable * 7063 nft_flowtable_lookup_byhandle(const struct nft_table *table, 7064 const struct nlattr *nla, u8 genmask) 7065 { 7066 struct nft_flowtable *flowtable; 7067 7068 list_for_each_entry(flowtable, &table->flowtables, list) { 7069 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle && 7070 nft_active_genmask(flowtable, genmask)) 7071 return flowtable; 7072 } 7073 return ERR_PTR(-ENOENT); 7074 } 7075 7076 struct nft_flowtable_hook { 7077 u32 num; 7078 int priority; 7079 struct list_head list; 7080 }; 7081 7082 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { 7083 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, 7084 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, 7085 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, 7086 }; 7087 7088 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx, 7089 const struct nlattr *attr, 7090 struct nft_flowtable_hook *flowtable_hook, 7091 struct nft_flowtable *flowtable, bool add) 7092 { 7093 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; 7094 struct nft_hook *hook; 7095 int hooknum, priority; 7096 int err; 7097 7098 INIT_LIST_HEAD(&flowtable_hook->list); 7099 7100 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, 7101 nft_flowtable_hook_policy, NULL); 7102 if (err < 0) 7103 return err; 7104 7105 if (add) { 7106 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || 7107 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) 7108 return -EINVAL; 7109 7110 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); 7111 if (hooknum != NF_NETDEV_INGRESS) 7112 return -EOPNOTSUPP; 7113 7114 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); 7115 7116 flowtable_hook->priority = priority; 7117 flowtable_hook->num = hooknum; 7118 } else { 7119 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) { 7120 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); 7121 if (hooknum != flowtable->hooknum) 7122 return -EOPNOTSUPP; 7123 } 7124 7125 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) { 7126 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); 7127 if (priority != flowtable->data.priority) 7128 return -EOPNOTSUPP; 7129 } 7130 7131 flowtable_hook->priority = flowtable->data.priority; 7132 flowtable_hook->num = flowtable->hooknum; 7133 } 7134 7135 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) { 7136 err = nf_tables_parse_netdev_hooks(ctx->net, 7137 tb[NFTA_FLOWTABLE_HOOK_DEVS], 7138 &flowtable_hook->list); 7139 if (err < 0) 7140 return err; 7141 } 7142 7143 list_for_each_entry(hook, &flowtable_hook->list, list) { 7144 hook->ops.pf = NFPROTO_NETDEV; 7145 hook->ops.hooknum = flowtable_hook->num; 7146 hook->ops.priority = flowtable_hook->priority; 7147 hook->ops.priv = &flowtable->data; 7148 hook->ops.hook = flowtable->data.type->hook; 7149 } 7150 7151 return err; 7152 } 7153 7154 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family) 7155 { 7156 const struct nf_flowtable_type *type; 7157 7158 list_for_each_entry(type, &nf_tables_flowtables, list) { 7159 if (family == type->family) 7160 return type; 7161 } 7162 return NULL; 7163 } 7164 7165 static const struct nf_flowtable_type * 7166 nft_flowtable_type_get(struct net *net, u8 family) 7167 { 7168 const struct nf_flowtable_type *type; 7169 7170 type = __nft_flowtable_type_get(family); 7171 if (type != NULL && try_module_get(type->owner)) 7172 return type; 7173 7174 lockdep_nfnl_nft_mutex_not_held(); 7175 #ifdef CONFIG_MODULES 7176 if (type == NULL) { 7177 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN) 7178 return ERR_PTR(-EAGAIN); 7179 } 7180 #endif 7181 return ERR_PTR(-ENOENT); 7182 } 7183 7184 /* Only called from error and netdev event paths. */ 7185 static void nft_unregister_flowtable_hook(struct net *net, 7186 struct nft_flowtable *flowtable, 7187 struct nft_hook *hook) 7188 { 7189 nf_unregister_net_hook(net, &hook->ops); 7190 flowtable->data.type->setup(&flowtable->data, hook->ops.dev, 7191 FLOW_BLOCK_UNBIND); 7192 } 7193 7194 static void nft_unregister_flowtable_net_hooks(struct net *net, 7195 struct list_head *hook_list) 7196 { 7197 struct nft_hook *hook; 7198 7199 list_for_each_entry(hook, hook_list, list) 7200 nf_unregister_net_hook(net, &hook->ops); 7201 } 7202 7203 static int nft_register_flowtable_net_hooks(struct net *net, 7204 struct nft_table *table, 7205 struct list_head *hook_list, 7206 struct nft_flowtable *flowtable) 7207 { 7208 struct nft_hook *hook, *hook2, *next; 7209 struct nft_flowtable *ft; 7210 int err, i = 0; 7211 7212 list_for_each_entry(hook, hook_list, list) { 7213 list_for_each_entry(ft, &table->flowtables, list) { 7214 if (!nft_is_active_next(net, ft)) 7215 continue; 7216 7217 list_for_each_entry(hook2, &ft->hook_list, list) { 7218 if (hook->ops.dev == hook2->ops.dev && 7219 hook->ops.pf == hook2->ops.pf) { 7220 err = -EEXIST; 7221 goto err_unregister_net_hooks; 7222 } 7223 } 7224 } 7225 7226 err = flowtable->data.type->setup(&flowtable->data, 7227 hook->ops.dev, 7228 FLOW_BLOCK_BIND); 7229 if (err < 0) 7230 goto err_unregister_net_hooks; 7231 7232 err = nf_register_net_hook(net, &hook->ops); 7233 if (err < 0) { 7234 flowtable->data.type->setup(&flowtable->data, 7235 hook->ops.dev, 7236 FLOW_BLOCK_UNBIND); 7237 goto err_unregister_net_hooks; 7238 } 7239 7240 i++; 7241 } 7242 7243 return 0; 7244 7245 err_unregister_net_hooks: 7246 list_for_each_entry_safe(hook, next, hook_list, list) { 7247 if (i-- <= 0) 7248 break; 7249 7250 nft_unregister_flowtable_hook(net, flowtable, hook); 7251 list_del_rcu(&hook->list); 7252 kfree_rcu(hook, rcu); 7253 } 7254 7255 return err; 7256 } 7257 7258 static void nft_flowtable_hooks_destroy(struct list_head *hook_list) 7259 { 7260 struct nft_hook *hook, *next; 7261 7262 list_for_each_entry_safe(hook, next, hook_list, list) { 7263 list_del_rcu(&hook->list); 7264 kfree_rcu(hook, rcu); 7265 } 7266 } 7267 7268 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh, 7269 struct nft_flowtable *flowtable) 7270 { 7271 const struct nlattr * const *nla = ctx->nla; 7272 struct nft_flowtable_hook flowtable_hook; 7273 struct nft_hook *hook, *next; 7274 struct nft_trans *trans; 7275 bool unregister = false; 7276 u32 flags; 7277 int err; 7278 7279 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK], 7280 &flowtable_hook, flowtable, false); 7281 if (err < 0) 7282 return err; 7283 7284 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) { 7285 if (nft_hook_list_find(&flowtable->hook_list, hook)) { 7286 list_del(&hook->list); 7287 kfree(hook); 7288 } 7289 } 7290 7291 if (nla[NFTA_FLOWTABLE_FLAGS]) { 7292 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS])); 7293 if (flags & ~NFT_FLOWTABLE_MASK) 7294 return -EOPNOTSUPP; 7295 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^ 7296 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) 7297 return -EOPNOTSUPP; 7298 } else { 7299 flags = flowtable->data.flags; 7300 } 7301 7302 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table, 7303 &flowtable_hook.list, flowtable); 7304 if (err < 0) 7305 goto err_flowtable_update_hook; 7306 7307 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE, 7308 sizeof(struct nft_trans_flowtable)); 7309 if (!trans) { 7310 unregister = true; 7311 err = -ENOMEM; 7312 goto err_flowtable_update_hook; 7313 } 7314 7315 nft_trans_flowtable_flags(trans) = flags; 7316 nft_trans_flowtable(trans) = flowtable; 7317 nft_trans_flowtable_update(trans) = true; 7318 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 7319 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans)); 7320 7321 nft_trans_commit_list_add_tail(ctx->net, trans); 7322 7323 return 0; 7324 7325 err_flowtable_update_hook: 7326 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) { 7327 if (unregister) 7328 nft_unregister_flowtable_hook(ctx->net, flowtable, hook); 7329 list_del_rcu(&hook->list); 7330 kfree_rcu(hook, rcu); 7331 } 7332 7333 return err; 7334 7335 } 7336 7337 static int nf_tables_newflowtable(struct sk_buff *skb, 7338 const struct nfnl_info *info, 7339 const struct nlattr * const nla[]) 7340 { 7341 struct netlink_ext_ack *extack = info->extack; 7342 struct nft_flowtable_hook flowtable_hook; 7343 u8 genmask = nft_genmask_next(info->net); 7344 u8 family = info->nfmsg->nfgen_family; 7345 const struct nf_flowtable_type *type; 7346 struct nft_flowtable *flowtable; 7347 struct nft_hook *hook, *next; 7348 struct net *net = info->net; 7349 struct nft_table *table; 7350 struct nft_ctx ctx; 7351 int err; 7352 7353 if (!nla[NFTA_FLOWTABLE_TABLE] || 7354 !nla[NFTA_FLOWTABLE_NAME] || 7355 !nla[NFTA_FLOWTABLE_HOOK]) 7356 return -EINVAL; 7357 7358 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7359 genmask, NETLINK_CB(skb).portid); 7360 if (IS_ERR(table)) { 7361 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); 7362 return PTR_ERR(table); 7363 } 7364 7365 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], 7366 genmask); 7367 if (IS_ERR(flowtable)) { 7368 err = PTR_ERR(flowtable); 7369 if (err != -ENOENT) { 7370 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); 7371 return err; 7372 } 7373 } else { 7374 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 7375 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); 7376 return -EEXIST; 7377 } 7378 7379 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7380 7381 return nft_flowtable_update(&ctx, info->nlh, flowtable); 7382 } 7383 7384 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7385 7386 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL); 7387 if (!flowtable) 7388 return -ENOMEM; 7389 7390 flowtable->table = table; 7391 flowtable->handle = nf_tables_alloc_handle(table); 7392 INIT_LIST_HEAD(&flowtable->hook_list); 7393 7394 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL); 7395 if (!flowtable->name) { 7396 err = -ENOMEM; 7397 goto err1; 7398 } 7399 7400 type = nft_flowtable_type_get(net, family); 7401 if (IS_ERR(type)) { 7402 err = PTR_ERR(type); 7403 goto err2; 7404 } 7405 7406 if (nla[NFTA_FLOWTABLE_FLAGS]) { 7407 flowtable->data.flags = 7408 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS])); 7409 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) { 7410 err = -EOPNOTSUPP; 7411 goto err3; 7412 } 7413 } 7414 7415 write_pnet(&flowtable->data.net, net); 7416 flowtable->data.type = type; 7417 err = type->init(&flowtable->data); 7418 if (err < 0) 7419 goto err3; 7420 7421 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], 7422 &flowtable_hook, flowtable, true); 7423 if (err < 0) 7424 goto err4; 7425 7426 list_splice(&flowtable_hook.list, &flowtable->hook_list); 7427 flowtable->data.priority = flowtable_hook.priority; 7428 flowtable->hooknum = flowtable_hook.num; 7429 7430 err = nft_register_flowtable_net_hooks(ctx.net, table, 7431 &flowtable->hook_list, 7432 flowtable); 7433 if (err < 0) { 7434 nft_flowtable_hooks_destroy(&flowtable->hook_list); 7435 goto err4; 7436 } 7437 7438 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); 7439 if (err < 0) 7440 goto err5; 7441 7442 list_add_tail_rcu(&flowtable->list, &table->flowtables); 7443 table->use++; 7444 7445 return 0; 7446 err5: 7447 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 7448 nft_unregister_flowtable_hook(net, flowtable, hook); 7449 list_del_rcu(&hook->list); 7450 kfree_rcu(hook, rcu); 7451 } 7452 err4: 7453 flowtable->data.type->free(&flowtable->data); 7454 err3: 7455 module_put(type->owner); 7456 err2: 7457 kfree(flowtable->name); 7458 err1: 7459 kfree(flowtable); 7460 return err; 7461 } 7462 7463 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook) 7464 { 7465 struct nft_hook *this, *next; 7466 7467 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) { 7468 list_del(&this->list); 7469 kfree(this); 7470 } 7471 } 7472 7473 static int nft_delflowtable_hook(struct nft_ctx *ctx, 7474 struct nft_flowtable *flowtable) 7475 { 7476 const struct nlattr * const *nla = ctx->nla; 7477 struct nft_flowtable_hook flowtable_hook; 7478 struct nft_hook *this, *hook; 7479 struct nft_trans *trans; 7480 int err; 7481 7482 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK], 7483 &flowtable_hook, flowtable, false); 7484 if (err < 0) 7485 return err; 7486 7487 list_for_each_entry(this, &flowtable_hook.list, list) { 7488 hook = nft_hook_list_find(&flowtable->hook_list, this); 7489 if (!hook) { 7490 err = -ENOENT; 7491 goto err_flowtable_del_hook; 7492 } 7493 hook->inactive = true; 7494 } 7495 7496 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE, 7497 sizeof(struct nft_trans_flowtable)); 7498 if (!trans) { 7499 err = -ENOMEM; 7500 goto err_flowtable_del_hook; 7501 } 7502 7503 nft_trans_flowtable(trans) = flowtable; 7504 nft_trans_flowtable_update(trans) = true; 7505 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 7506 nft_flowtable_hook_release(&flowtable_hook); 7507 7508 nft_trans_commit_list_add_tail(ctx->net, trans); 7509 7510 return 0; 7511 7512 err_flowtable_del_hook: 7513 list_for_each_entry(this, &flowtable_hook.list, list) { 7514 hook = nft_hook_list_find(&flowtable->hook_list, this); 7515 if (!hook) 7516 break; 7517 7518 hook->inactive = false; 7519 } 7520 nft_flowtable_hook_release(&flowtable_hook); 7521 7522 return err; 7523 } 7524 7525 static int nf_tables_delflowtable(struct sk_buff *skb, 7526 const struct nfnl_info *info, 7527 const struct nlattr * const nla[]) 7528 { 7529 struct netlink_ext_ack *extack = info->extack; 7530 u8 genmask = nft_genmask_next(info->net); 7531 u8 family = info->nfmsg->nfgen_family; 7532 struct nft_flowtable *flowtable; 7533 struct net *net = info->net; 7534 const struct nlattr *attr; 7535 struct nft_table *table; 7536 struct nft_ctx ctx; 7537 7538 if (!nla[NFTA_FLOWTABLE_TABLE] || 7539 (!nla[NFTA_FLOWTABLE_NAME] && 7540 !nla[NFTA_FLOWTABLE_HANDLE])) 7541 return -EINVAL; 7542 7543 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7544 genmask, NETLINK_CB(skb).portid); 7545 if (IS_ERR(table)) { 7546 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); 7547 return PTR_ERR(table); 7548 } 7549 7550 if (nla[NFTA_FLOWTABLE_HANDLE]) { 7551 attr = nla[NFTA_FLOWTABLE_HANDLE]; 7552 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask); 7553 } else { 7554 attr = nla[NFTA_FLOWTABLE_NAME]; 7555 flowtable = nft_flowtable_lookup(table, attr, genmask); 7556 } 7557 7558 if (IS_ERR(flowtable)) { 7559 NL_SET_BAD_ATTR(extack, attr); 7560 return PTR_ERR(flowtable); 7561 } 7562 7563 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7564 7565 if (nla[NFTA_FLOWTABLE_HOOK]) 7566 return nft_delflowtable_hook(&ctx, flowtable); 7567 7568 if (flowtable->use > 0) { 7569 NL_SET_BAD_ATTR(extack, attr); 7570 return -EBUSY; 7571 } 7572 7573 return nft_delflowtable(&ctx, flowtable); 7574 } 7575 7576 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, 7577 u32 portid, u32 seq, int event, 7578 u32 flags, int family, 7579 struct nft_flowtable *flowtable, 7580 struct list_head *hook_list) 7581 { 7582 struct nlattr *nest, *nest_devs; 7583 struct nft_hook *hook; 7584 struct nlmsghdr *nlh; 7585 7586 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 7587 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 7588 NFNETLINK_V0, nft_base_seq(net)); 7589 if (!nlh) 7590 goto nla_put_failure; 7591 7592 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || 7593 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || 7594 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) || 7595 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle), 7596 NFTA_FLOWTABLE_PAD) || 7597 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags))) 7598 goto nla_put_failure; 7599 7600 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK); 7601 if (!nest) 7602 goto nla_put_failure; 7603 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || 7604 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority))) 7605 goto nla_put_failure; 7606 7607 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS); 7608 if (!nest_devs) 7609 goto nla_put_failure; 7610 7611 list_for_each_entry_rcu(hook, hook_list, list) { 7612 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name)) 7613 goto nla_put_failure; 7614 } 7615 nla_nest_end(skb, nest_devs); 7616 nla_nest_end(skb, nest); 7617 7618 nlmsg_end(skb, nlh); 7619 return 0; 7620 7621 nla_put_failure: 7622 nlmsg_trim(skb, nlh); 7623 return -1; 7624 } 7625 7626 struct nft_flowtable_filter { 7627 char *table; 7628 }; 7629 7630 static int nf_tables_dump_flowtable(struct sk_buff *skb, 7631 struct netlink_callback *cb) 7632 { 7633 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 7634 struct nft_flowtable_filter *filter = cb->data; 7635 unsigned int idx = 0, s_idx = cb->args[0]; 7636 struct net *net = sock_net(skb->sk); 7637 int family = nfmsg->nfgen_family; 7638 struct nft_flowtable *flowtable; 7639 struct nftables_pernet *nft_net; 7640 const struct nft_table *table; 7641 7642 rcu_read_lock(); 7643 nft_net = nft_pernet(net); 7644 cb->seq = nft_net->base_seq; 7645 7646 list_for_each_entry_rcu(table, &nft_net->tables, list) { 7647 if (family != NFPROTO_UNSPEC && family != table->family) 7648 continue; 7649 7650 list_for_each_entry_rcu(flowtable, &table->flowtables, list) { 7651 if (!nft_is_active(net, flowtable)) 7652 goto cont; 7653 if (idx < s_idx) 7654 goto cont; 7655 if (idx > s_idx) 7656 memset(&cb->args[1], 0, 7657 sizeof(cb->args) - sizeof(cb->args[0])); 7658 if (filter && filter->table && 7659 strcmp(filter->table, table->name)) 7660 goto cont; 7661 7662 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, 7663 cb->nlh->nlmsg_seq, 7664 NFT_MSG_NEWFLOWTABLE, 7665 NLM_F_MULTI | NLM_F_APPEND, 7666 table->family, 7667 flowtable, 7668 &flowtable->hook_list) < 0) 7669 goto done; 7670 7671 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 7672 cont: 7673 idx++; 7674 } 7675 } 7676 done: 7677 rcu_read_unlock(); 7678 7679 cb->args[0] = idx; 7680 return skb->len; 7681 } 7682 7683 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb) 7684 { 7685 const struct nlattr * const *nla = cb->data; 7686 struct nft_flowtable_filter *filter = NULL; 7687 7688 if (nla[NFTA_FLOWTABLE_TABLE]) { 7689 filter = kzalloc(sizeof(*filter), GFP_ATOMIC); 7690 if (!filter) 7691 return -ENOMEM; 7692 7693 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], 7694 GFP_ATOMIC); 7695 if (!filter->table) { 7696 kfree(filter); 7697 return -ENOMEM; 7698 } 7699 } 7700 7701 cb->data = filter; 7702 return 0; 7703 } 7704 7705 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) 7706 { 7707 struct nft_flowtable_filter *filter = cb->data; 7708 7709 if (!filter) 7710 return 0; 7711 7712 kfree(filter->table); 7713 kfree(filter); 7714 7715 return 0; 7716 } 7717 7718 /* called with rcu_read_lock held */ 7719 static int nf_tables_getflowtable(struct sk_buff *skb, 7720 const struct nfnl_info *info, 7721 const struct nlattr * const nla[]) 7722 { 7723 u8 genmask = nft_genmask_cur(info->net); 7724 u8 family = info->nfmsg->nfgen_family; 7725 struct nft_flowtable *flowtable; 7726 const struct nft_table *table; 7727 struct net *net = info->net; 7728 struct sk_buff *skb2; 7729 int err; 7730 7731 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 7732 struct netlink_dump_control c = { 7733 .start = nf_tables_dump_flowtable_start, 7734 .dump = nf_tables_dump_flowtable, 7735 .done = nf_tables_dump_flowtable_done, 7736 .module = THIS_MODULE, 7737 .data = (void *)nla, 7738 }; 7739 7740 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 7741 } 7742 7743 if (!nla[NFTA_FLOWTABLE_NAME]) 7744 return -EINVAL; 7745 7746 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7747 genmask, 0); 7748 if (IS_ERR(table)) 7749 return PTR_ERR(table); 7750 7751 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], 7752 genmask); 7753 if (IS_ERR(flowtable)) 7754 return PTR_ERR(flowtable); 7755 7756 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 7757 if (!skb2) 7758 return -ENOMEM; 7759 7760 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, 7761 info->nlh->nlmsg_seq, 7762 NFT_MSG_NEWFLOWTABLE, 0, family, 7763 flowtable, &flowtable->hook_list); 7764 if (err < 0) 7765 goto err_fill_flowtable_info; 7766 7767 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 7768 7769 err_fill_flowtable_info: 7770 kfree_skb(skb2); 7771 return err; 7772 } 7773 7774 static void nf_tables_flowtable_notify(struct nft_ctx *ctx, 7775 struct nft_flowtable *flowtable, 7776 struct list_head *hook_list, 7777 int event) 7778 { 7779 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 7780 struct sk_buff *skb; 7781 u16 flags = 0; 7782 int err; 7783 7784 if (!ctx->report && 7785 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 7786 return; 7787 7788 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 7789 if (skb == NULL) 7790 goto err; 7791 7792 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 7793 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 7794 7795 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, 7796 ctx->seq, event, flags, 7797 ctx->family, flowtable, hook_list); 7798 if (err < 0) { 7799 kfree_skb(skb); 7800 goto err; 7801 } 7802 7803 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 7804 return; 7805 err: 7806 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 7807 } 7808 7809 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) 7810 { 7811 struct nft_hook *hook, *next; 7812 7813 flowtable->data.type->free(&flowtable->data); 7814 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 7815 flowtable->data.type->setup(&flowtable->data, hook->ops.dev, 7816 FLOW_BLOCK_UNBIND); 7817 list_del_rcu(&hook->list); 7818 kfree(hook); 7819 } 7820 kfree(flowtable->name); 7821 module_put(flowtable->data.type->owner); 7822 kfree(flowtable); 7823 } 7824 7825 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, 7826 u32 portid, u32 seq) 7827 { 7828 struct nftables_pernet *nft_net = nft_pernet(net); 7829 struct nlmsghdr *nlh; 7830 char buf[TASK_COMM_LEN]; 7831 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); 7832 7833 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC, 7834 NFNETLINK_V0, nft_base_seq(net)); 7835 if (!nlh) 7836 goto nla_put_failure; 7837 7838 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) || 7839 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || 7840 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) 7841 goto nla_put_failure; 7842 7843 nlmsg_end(skb, nlh); 7844 return 0; 7845 7846 nla_put_failure: 7847 nlmsg_trim(skb, nlh); 7848 return -EMSGSIZE; 7849 } 7850 7851 static void nft_flowtable_event(unsigned long event, struct net_device *dev, 7852 struct nft_flowtable *flowtable) 7853 { 7854 struct nft_hook *hook; 7855 7856 list_for_each_entry(hook, &flowtable->hook_list, list) { 7857 if (hook->ops.dev != dev) 7858 continue; 7859 7860 /* flow_offload_netdev_event() cleans up entries for us. */ 7861 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook); 7862 list_del_rcu(&hook->list); 7863 kfree_rcu(hook, rcu); 7864 break; 7865 } 7866 } 7867 7868 static int nf_tables_flowtable_event(struct notifier_block *this, 7869 unsigned long event, void *ptr) 7870 { 7871 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 7872 struct nft_flowtable *flowtable; 7873 struct nftables_pernet *nft_net; 7874 struct nft_table *table; 7875 struct net *net; 7876 7877 if (event != NETDEV_UNREGISTER) 7878 return 0; 7879 7880 net = dev_net(dev); 7881 nft_net = nft_pernet(net); 7882 mutex_lock(&nft_net->commit_mutex); 7883 list_for_each_entry(table, &nft_net->tables, list) { 7884 list_for_each_entry(flowtable, &table->flowtables, list) { 7885 nft_flowtable_event(event, dev, flowtable); 7886 } 7887 } 7888 mutex_unlock(&nft_net->commit_mutex); 7889 7890 return NOTIFY_DONE; 7891 } 7892 7893 static struct notifier_block nf_tables_flowtable_notifier = { 7894 .notifier_call = nf_tables_flowtable_event, 7895 }; 7896 7897 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, 7898 int event) 7899 { 7900 struct nlmsghdr *nlh = nlmsg_hdr(skb); 7901 struct sk_buff *skb2; 7902 int err; 7903 7904 if (!nlmsg_report(nlh) && 7905 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 7906 return; 7907 7908 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 7909 if (skb2 == NULL) 7910 goto err; 7911 7912 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, 7913 nlh->nlmsg_seq); 7914 if (err < 0) { 7915 kfree_skb(skb2); 7916 goto err; 7917 } 7918 7919 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, 7920 nlmsg_report(nlh), GFP_KERNEL); 7921 return; 7922 err: 7923 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, 7924 -ENOBUFS); 7925 } 7926 7927 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info, 7928 const struct nlattr * const nla[]) 7929 { 7930 struct sk_buff *skb2; 7931 int err; 7932 7933 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 7934 if (skb2 == NULL) 7935 return -ENOMEM; 7936 7937 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid, 7938 info->nlh->nlmsg_seq); 7939 if (err < 0) 7940 goto err_fill_gen_info; 7941 7942 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 7943 7944 err_fill_gen_info: 7945 kfree_skb(skb2); 7946 return err; 7947 } 7948 7949 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { 7950 [NFT_MSG_NEWTABLE] = { 7951 .call = nf_tables_newtable, 7952 .type = NFNL_CB_BATCH, 7953 .attr_count = NFTA_TABLE_MAX, 7954 .policy = nft_table_policy, 7955 }, 7956 [NFT_MSG_GETTABLE] = { 7957 .call = nf_tables_gettable, 7958 .type = NFNL_CB_RCU, 7959 .attr_count = NFTA_TABLE_MAX, 7960 .policy = nft_table_policy, 7961 }, 7962 [NFT_MSG_DELTABLE] = { 7963 .call = nf_tables_deltable, 7964 .type = NFNL_CB_BATCH, 7965 .attr_count = NFTA_TABLE_MAX, 7966 .policy = nft_table_policy, 7967 }, 7968 [NFT_MSG_NEWCHAIN] = { 7969 .call = nf_tables_newchain, 7970 .type = NFNL_CB_BATCH, 7971 .attr_count = NFTA_CHAIN_MAX, 7972 .policy = nft_chain_policy, 7973 }, 7974 [NFT_MSG_GETCHAIN] = { 7975 .call = nf_tables_getchain, 7976 .type = NFNL_CB_RCU, 7977 .attr_count = NFTA_CHAIN_MAX, 7978 .policy = nft_chain_policy, 7979 }, 7980 [NFT_MSG_DELCHAIN] = { 7981 .call = nf_tables_delchain, 7982 .type = NFNL_CB_BATCH, 7983 .attr_count = NFTA_CHAIN_MAX, 7984 .policy = nft_chain_policy, 7985 }, 7986 [NFT_MSG_NEWRULE] = { 7987 .call = nf_tables_newrule, 7988 .type = NFNL_CB_BATCH, 7989 .attr_count = NFTA_RULE_MAX, 7990 .policy = nft_rule_policy, 7991 }, 7992 [NFT_MSG_GETRULE] = { 7993 .call = nf_tables_getrule, 7994 .type = NFNL_CB_RCU, 7995 .attr_count = NFTA_RULE_MAX, 7996 .policy = nft_rule_policy, 7997 }, 7998 [NFT_MSG_DELRULE] = { 7999 .call = nf_tables_delrule, 8000 .type = NFNL_CB_BATCH, 8001 .attr_count = NFTA_RULE_MAX, 8002 .policy = nft_rule_policy, 8003 }, 8004 [NFT_MSG_NEWSET] = { 8005 .call = nf_tables_newset, 8006 .type = NFNL_CB_BATCH, 8007 .attr_count = NFTA_SET_MAX, 8008 .policy = nft_set_policy, 8009 }, 8010 [NFT_MSG_GETSET] = { 8011 .call = nf_tables_getset, 8012 .type = NFNL_CB_RCU, 8013 .attr_count = NFTA_SET_MAX, 8014 .policy = nft_set_policy, 8015 }, 8016 [NFT_MSG_DELSET] = { 8017 .call = nf_tables_delset, 8018 .type = NFNL_CB_BATCH, 8019 .attr_count = NFTA_SET_MAX, 8020 .policy = nft_set_policy, 8021 }, 8022 [NFT_MSG_NEWSETELEM] = { 8023 .call = nf_tables_newsetelem, 8024 .type = NFNL_CB_BATCH, 8025 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8026 .policy = nft_set_elem_list_policy, 8027 }, 8028 [NFT_MSG_GETSETELEM] = { 8029 .call = nf_tables_getsetelem, 8030 .type = NFNL_CB_RCU, 8031 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8032 .policy = nft_set_elem_list_policy, 8033 }, 8034 [NFT_MSG_DELSETELEM] = { 8035 .call = nf_tables_delsetelem, 8036 .type = NFNL_CB_BATCH, 8037 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8038 .policy = nft_set_elem_list_policy, 8039 }, 8040 [NFT_MSG_GETGEN] = { 8041 .call = nf_tables_getgen, 8042 .type = NFNL_CB_RCU, 8043 }, 8044 [NFT_MSG_NEWOBJ] = { 8045 .call = nf_tables_newobj, 8046 .type = NFNL_CB_BATCH, 8047 .attr_count = NFTA_OBJ_MAX, 8048 .policy = nft_obj_policy, 8049 }, 8050 [NFT_MSG_GETOBJ] = { 8051 .call = nf_tables_getobj, 8052 .type = NFNL_CB_RCU, 8053 .attr_count = NFTA_OBJ_MAX, 8054 .policy = nft_obj_policy, 8055 }, 8056 [NFT_MSG_DELOBJ] = { 8057 .call = nf_tables_delobj, 8058 .type = NFNL_CB_BATCH, 8059 .attr_count = NFTA_OBJ_MAX, 8060 .policy = nft_obj_policy, 8061 }, 8062 [NFT_MSG_GETOBJ_RESET] = { 8063 .call = nf_tables_getobj, 8064 .type = NFNL_CB_RCU, 8065 .attr_count = NFTA_OBJ_MAX, 8066 .policy = nft_obj_policy, 8067 }, 8068 [NFT_MSG_NEWFLOWTABLE] = { 8069 .call = nf_tables_newflowtable, 8070 .type = NFNL_CB_BATCH, 8071 .attr_count = NFTA_FLOWTABLE_MAX, 8072 .policy = nft_flowtable_policy, 8073 }, 8074 [NFT_MSG_GETFLOWTABLE] = { 8075 .call = nf_tables_getflowtable, 8076 .type = NFNL_CB_RCU, 8077 .attr_count = NFTA_FLOWTABLE_MAX, 8078 .policy = nft_flowtable_policy, 8079 }, 8080 [NFT_MSG_DELFLOWTABLE] = { 8081 .call = nf_tables_delflowtable, 8082 .type = NFNL_CB_BATCH, 8083 .attr_count = NFTA_FLOWTABLE_MAX, 8084 .policy = nft_flowtable_policy, 8085 }, 8086 }; 8087 8088 static int nf_tables_validate(struct net *net) 8089 { 8090 struct nftables_pernet *nft_net = nft_pernet(net); 8091 struct nft_table *table; 8092 8093 switch (nft_net->validate_state) { 8094 case NFT_VALIDATE_SKIP: 8095 break; 8096 case NFT_VALIDATE_NEED: 8097 nft_validate_state_update(net, NFT_VALIDATE_DO); 8098 fallthrough; 8099 case NFT_VALIDATE_DO: 8100 list_for_each_entry(table, &nft_net->tables, list) { 8101 if (nft_table_validate(net, table) < 0) 8102 return -EAGAIN; 8103 } 8104 break; 8105 } 8106 8107 return 0; 8108 } 8109 8110 /* a drop policy has to be deferred until all rules have been activated, 8111 * otherwise a large ruleset that contains a drop-policy base chain will 8112 * cause all packets to get dropped until the full transaction has been 8113 * processed. 8114 * 8115 * We defer the drop policy until the transaction has been finalized. 8116 */ 8117 static void nft_chain_commit_drop_policy(struct nft_trans *trans) 8118 { 8119 struct nft_base_chain *basechain; 8120 8121 if (nft_trans_chain_policy(trans) != NF_DROP) 8122 return; 8123 8124 if (!nft_is_base_chain(trans->ctx.chain)) 8125 return; 8126 8127 basechain = nft_base_chain(trans->ctx.chain); 8128 basechain->policy = NF_DROP; 8129 } 8130 8131 static void nft_chain_commit_update(struct nft_trans *trans) 8132 { 8133 struct nft_base_chain *basechain; 8134 8135 if (nft_trans_chain_name(trans)) { 8136 rhltable_remove(&trans->ctx.table->chains_ht, 8137 &trans->ctx.chain->rhlhead, 8138 nft_chain_ht_params); 8139 swap(trans->ctx.chain->name, nft_trans_chain_name(trans)); 8140 rhltable_insert_key(&trans->ctx.table->chains_ht, 8141 trans->ctx.chain->name, 8142 &trans->ctx.chain->rhlhead, 8143 nft_chain_ht_params); 8144 } 8145 8146 if (!nft_is_base_chain(trans->ctx.chain)) 8147 return; 8148 8149 nft_chain_stats_replace(trans); 8150 8151 basechain = nft_base_chain(trans->ctx.chain); 8152 8153 switch (nft_trans_chain_policy(trans)) { 8154 case NF_DROP: 8155 case NF_ACCEPT: 8156 basechain->policy = nft_trans_chain_policy(trans); 8157 break; 8158 } 8159 } 8160 8161 static void nft_obj_commit_update(struct nft_trans *trans) 8162 { 8163 struct nft_object *newobj; 8164 struct nft_object *obj; 8165 8166 obj = nft_trans_obj(trans); 8167 newobj = nft_trans_obj_newobj(trans); 8168 8169 if (obj->ops->update) 8170 obj->ops->update(obj, newobj); 8171 8172 kfree(newobj); 8173 } 8174 8175 static void nft_commit_release(struct nft_trans *trans) 8176 { 8177 switch (trans->msg_type) { 8178 case NFT_MSG_DELTABLE: 8179 nf_tables_table_destroy(&trans->ctx); 8180 break; 8181 case NFT_MSG_NEWCHAIN: 8182 free_percpu(nft_trans_chain_stats(trans)); 8183 kfree(nft_trans_chain_name(trans)); 8184 break; 8185 case NFT_MSG_DELCHAIN: 8186 nf_tables_chain_destroy(&trans->ctx); 8187 break; 8188 case NFT_MSG_DELRULE: 8189 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); 8190 break; 8191 case NFT_MSG_DELSET: 8192 nft_set_destroy(&trans->ctx, nft_trans_set(trans)); 8193 break; 8194 case NFT_MSG_DELSETELEM: 8195 nf_tables_set_elem_destroy(&trans->ctx, 8196 nft_trans_elem_set(trans), 8197 nft_trans_elem(trans).priv); 8198 break; 8199 case NFT_MSG_DELOBJ: 8200 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); 8201 break; 8202 case NFT_MSG_DELFLOWTABLE: 8203 if (nft_trans_flowtable_update(trans)) 8204 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans)); 8205 else 8206 nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); 8207 break; 8208 } 8209 8210 if (trans->put_net) 8211 put_net(trans->ctx.net); 8212 8213 kfree(trans); 8214 } 8215 8216 static void nf_tables_trans_destroy_work(struct work_struct *w) 8217 { 8218 struct nft_trans *trans, *next; 8219 LIST_HEAD(head); 8220 8221 spin_lock(&nf_tables_destroy_list_lock); 8222 list_splice_init(&nf_tables_destroy_list, &head); 8223 spin_unlock(&nf_tables_destroy_list_lock); 8224 8225 if (list_empty(&head)) 8226 return; 8227 8228 synchronize_rcu(); 8229 8230 list_for_each_entry_safe(trans, next, &head, list) { 8231 list_del(&trans->list); 8232 nft_commit_release(trans); 8233 } 8234 } 8235 8236 void nf_tables_trans_destroy_flush_work(void) 8237 { 8238 flush_work(&trans_destroy_work); 8239 } 8240 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work); 8241 8242 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain) 8243 { 8244 struct nft_rule *rule; 8245 unsigned int alloc = 0; 8246 int i; 8247 8248 /* already handled or inactive chain? */ 8249 if (chain->rules_next || !nft_is_active_next(net, chain)) 8250 return 0; 8251 8252 rule = list_entry(&chain->rules, struct nft_rule, list); 8253 i = 0; 8254 8255 list_for_each_entry_continue(rule, &chain->rules, list) { 8256 if (nft_is_active_next(net, rule)) 8257 alloc++; 8258 } 8259 8260 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc); 8261 if (!chain->rules_next) 8262 return -ENOMEM; 8263 8264 list_for_each_entry_continue(rule, &chain->rules, list) { 8265 if (nft_is_active_next(net, rule)) 8266 chain->rules_next[i++] = rule; 8267 } 8268 8269 chain->rules_next[i] = NULL; 8270 return 0; 8271 } 8272 8273 static void nf_tables_commit_chain_prepare_cancel(struct net *net) 8274 { 8275 struct nftables_pernet *nft_net = nft_pernet(net); 8276 struct nft_trans *trans, *next; 8277 8278 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8279 struct nft_chain *chain = trans->ctx.chain; 8280 8281 if (trans->msg_type == NFT_MSG_NEWRULE || 8282 trans->msg_type == NFT_MSG_DELRULE) { 8283 kvfree(chain->rules_next); 8284 chain->rules_next = NULL; 8285 } 8286 } 8287 } 8288 8289 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h) 8290 { 8291 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h); 8292 8293 kvfree(o->start); 8294 } 8295 8296 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules) 8297 { 8298 struct nft_rule **r = rules; 8299 struct nft_rules_old *old; 8300 8301 while (*r) 8302 r++; 8303 8304 r++; /* rcu_head is after end marker */ 8305 old = (void *) r; 8306 old->start = rules; 8307 8308 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old); 8309 } 8310 8311 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain) 8312 { 8313 struct nft_rule **g0, **g1; 8314 bool next_genbit; 8315 8316 next_genbit = nft_gencursor_next(net); 8317 8318 g0 = rcu_dereference_protected(chain->rules_gen_0, 8319 lockdep_commit_lock_is_held(net)); 8320 g1 = rcu_dereference_protected(chain->rules_gen_1, 8321 lockdep_commit_lock_is_held(net)); 8322 8323 /* No changes to this chain? */ 8324 if (chain->rules_next == NULL) { 8325 /* chain had no change in last or next generation */ 8326 if (g0 == g1) 8327 return; 8328 /* 8329 * chain had no change in this generation; make sure next 8330 * one uses same rules as current generation. 8331 */ 8332 if (next_genbit) { 8333 rcu_assign_pointer(chain->rules_gen_1, g0); 8334 nf_tables_commit_chain_free_rules_old(g1); 8335 } else { 8336 rcu_assign_pointer(chain->rules_gen_0, g1); 8337 nf_tables_commit_chain_free_rules_old(g0); 8338 } 8339 8340 return; 8341 } 8342 8343 if (next_genbit) 8344 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next); 8345 else 8346 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next); 8347 8348 chain->rules_next = NULL; 8349 8350 if (g0 == g1) 8351 return; 8352 8353 if (next_genbit) 8354 nf_tables_commit_chain_free_rules_old(g1); 8355 else 8356 nf_tables_commit_chain_free_rules_old(g0); 8357 } 8358 8359 static void nft_obj_del(struct nft_object *obj) 8360 { 8361 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params); 8362 list_del_rcu(&obj->list); 8363 } 8364 8365 void nft_chain_del(struct nft_chain *chain) 8366 { 8367 struct nft_table *table = chain->table; 8368 8369 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead, 8370 nft_chain_ht_params)); 8371 list_del_rcu(&chain->list); 8372 } 8373 8374 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable, 8375 struct list_head *hook_list) 8376 { 8377 struct nft_hook *hook, *next; 8378 8379 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 8380 if (hook->inactive) 8381 list_move(&hook->list, hook_list); 8382 } 8383 } 8384 8385 static void nf_tables_module_autoload_cleanup(struct net *net) 8386 { 8387 struct nftables_pernet *nft_net = nft_pernet(net); 8388 struct nft_module_request *req, *next; 8389 8390 WARN_ON_ONCE(!list_empty(&nft_net->commit_list)); 8391 list_for_each_entry_safe(req, next, &nft_net->module_list, list) { 8392 WARN_ON_ONCE(!req->done); 8393 list_del(&req->list); 8394 kfree(req); 8395 } 8396 } 8397 8398 static void nf_tables_commit_release(struct net *net) 8399 { 8400 struct nftables_pernet *nft_net = nft_pernet(net); 8401 struct nft_trans *trans; 8402 8403 /* all side effects have to be made visible. 8404 * For example, if a chain named 'foo' has been deleted, a 8405 * new transaction must not find it anymore. 8406 * 8407 * Memory reclaim happens asynchronously from work queue 8408 * to prevent expensive synchronize_rcu() in commit phase. 8409 */ 8410 if (list_empty(&nft_net->commit_list)) { 8411 nf_tables_module_autoload_cleanup(net); 8412 mutex_unlock(&nft_net->commit_mutex); 8413 return; 8414 } 8415 8416 trans = list_last_entry(&nft_net->commit_list, 8417 struct nft_trans, list); 8418 get_net(trans->ctx.net); 8419 WARN_ON_ONCE(trans->put_net); 8420 8421 trans->put_net = true; 8422 spin_lock(&nf_tables_destroy_list_lock); 8423 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list); 8424 spin_unlock(&nf_tables_destroy_list_lock); 8425 8426 nf_tables_module_autoload_cleanup(net); 8427 schedule_work(&trans_destroy_work); 8428 8429 mutex_unlock(&nft_net->commit_mutex); 8430 } 8431 8432 static void nft_commit_notify(struct net *net, u32 portid) 8433 { 8434 struct nftables_pernet *nft_net = nft_pernet(net); 8435 struct sk_buff *batch_skb = NULL, *nskb, *skb; 8436 unsigned char *data; 8437 int len; 8438 8439 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) { 8440 if (!batch_skb) { 8441 new_batch: 8442 batch_skb = skb; 8443 len = NLMSG_GOODSIZE - skb->len; 8444 list_del(&skb->list); 8445 continue; 8446 } 8447 len -= skb->len; 8448 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) { 8449 data = skb_put(batch_skb, skb->len); 8450 memcpy(data, skb->data, skb->len); 8451 list_del(&skb->list); 8452 kfree_skb(skb); 8453 continue; 8454 } 8455 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES, 8456 NFT_CB(batch_skb).report, GFP_KERNEL); 8457 goto new_batch; 8458 } 8459 8460 if (batch_skb) { 8461 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES, 8462 NFT_CB(batch_skb).report, GFP_KERNEL); 8463 } 8464 8465 WARN_ON_ONCE(!list_empty(&nft_net->notify_list)); 8466 } 8467 8468 static int nf_tables_commit_audit_alloc(struct list_head *adl, 8469 struct nft_table *table) 8470 { 8471 struct nft_audit_data *adp; 8472 8473 list_for_each_entry(adp, adl, list) { 8474 if (adp->table == table) 8475 return 0; 8476 } 8477 adp = kzalloc(sizeof(*adp), GFP_KERNEL); 8478 if (!adp) 8479 return -ENOMEM; 8480 adp->table = table; 8481 list_add(&adp->list, adl); 8482 return 0; 8483 } 8484 8485 static void nf_tables_commit_audit_free(struct list_head *adl) 8486 { 8487 struct nft_audit_data *adp, *adn; 8488 8489 list_for_each_entry_safe(adp, adn, adl, list) { 8490 list_del(&adp->list); 8491 kfree(adp); 8492 } 8493 } 8494 8495 static void nf_tables_commit_audit_collect(struct list_head *adl, 8496 struct nft_table *table, u32 op) 8497 { 8498 struct nft_audit_data *adp; 8499 8500 list_for_each_entry(adp, adl, list) { 8501 if (adp->table == table) 8502 goto found; 8503 } 8504 WARN_ONCE(1, "table=%s not expected in commit list", table->name); 8505 return; 8506 found: 8507 adp->entries++; 8508 if (!adp->op || adp->op > op) 8509 adp->op = op; 8510 } 8511 8512 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22) 8513 8514 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation) 8515 { 8516 struct nft_audit_data *adp, *adn; 8517 char aubuf[AUNFTABLENAMELEN]; 8518 8519 list_for_each_entry_safe(adp, adn, adl, list) { 8520 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name, 8521 generation); 8522 audit_log_nfcfg(aubuf, adp->table->family, adp->entries, 8523 nft2audit_op[adp->op], GFP_KERNEL); 8524 list_del(&adp->list); 8525 kfree(adp); 8526 } 8527 } 8528 8529 static int nf_tables_commit(struct net *net, struct sk_buff *skb) 8530 { 8531 struct nftables_pernet *nft_net = nft_pernet(net); 8532 struct nft_trans *trans, *next; 8533 struct nft_trans_elem *te; 8534 struct nft_chain *chain; 8535 struct nft_table *table; 8536 LIST_HEAD(adl); 8537 int err; 8538 8539 if (list_empty(&nft_net->commit_list)) { 8540 mutex_unlock(&nft_net->commit_mutex); 8541 return 0; 8542 } 8543 8544 /* 0. Validate ruleset, otherwise roll back for error reporting. */ 8545 if (nf_tables_validate(net) < 0) 8546 return -EAGAIN; 8547 8548 err = nft_flow_rule_offload_commit(net); 8549 if (err < 0) 8550 return err; 8551 8552 /* 1. Allocate space for next generation rules_gen_X[] */ 8553 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8554 int ret; 8555 8556 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table); 8557 if (ret) { 8558 nf_tables_commit_chain_prepare_cancel(net); 8559 nf_tables_commit_audit_free(&adl); 8560 return ret; 8561 } 8562 if (trans->msg_type == NFT_MSG_NEWRULE || 8563 trans->msg_type == NFT_MSG_DELRULE) { 8564 chain = trans->ctx.chain; 8565 8566 ret = nf_tables_commit_chain_prepare(net, chain); 8567 if (ret < 0) { 8568 nf_tables_commit_chain_prepare_cancel(net); 8569 nf_tables_commit_audit_free(&adl); 8570 return ret; 8571 } 8572 } 8573 } 8574 8575 /* step 2. Make rules_gen_X visible to packet path */ 8576 list_for_each_entry(table, &nft_net->tables, list) { 8577 list_for_each_entry(chain, &table->chains, list) 8578 nf_tables_commit_chain(net, chain); 8579 } 8580 8581 /* 8582 * Bump generation counter, invalidate any dump in progress. 8583 * Cannot fail after this point. 8584 */ 8585 while (++nft_net->base_seq == 0) 8586 ; 8587 8588 /* step 3. Start new generation, rules_gen_X now in use. */ 8589 net->nft.gencursor = nft_gencursor_next(net); 8590 8591 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8592 nf_tables_commit_audit_collect(&adl, trans->ctx.table, 8593 trans->msg_type); 8594 switch (trans->msg_type) { 8595 case NFT_MSG_NEWTABLE: 8596 if (nft_trans_table_update(trans)) { 8597 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) { 8598 nft_trans_destroy(trans); 8599 break; 8600 } 8601 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT) 8602 nf_tables_table_disable(net, trans->ctx.table); 8603 8604 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE; 8605 } else { 8606 nft_clear(net, trans->ctx.table); 8607 } 8608 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); 8609 nft_trans_destroy(trans); 8610 break; 8611 case NFT_MSG_DELTABLE: 8612 list_del_rcu(&trans->ctx.table->list); 8613 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); 8614 break; 8615 case NFT_MSG_NEWCHAIN: 8616 if (nft_trans_chain_update(trans)) { 8617 nft_chain_commit_update(trans); 8618 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); 8619 /* trans destroyed after rcu grace period */ 8620 } else { 8621 nft_chain_commit_drop_policy(trans); 8622 nft_clear(net, trans->ctx.chain); 8623 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); 8624 nft_trans_destroy(trans); 8625 } 8626 break; 8627 case NFT_MSG_DELCHAIN: 8628 nft_chain_del(trans->ctx.chain); 8629 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); 8630 nf_tables_unregister_hook(trans->ctx.net, 8631 trans->ctx.table, 8632 trans->ctx.chain); 8633 break; 8634 case NFT_MSG_NEWRULE: 8635 nft_clear(trans->ctx.net, nft_trans_rule(trans)); 8636 nf_tables_rule_notify(&trans->ctx, 8637 nft_trans_rule(trans), 8638 NFT_MSG_NEWRULE); 8639 nft_trans_destroy(trans); 8640 break; 8641 case NFT_MSG_DELRULE: 8642 list_del_rcu(&nft_trans_rule(trans)->list); 8643 nf_tables_rule_notify(&trans->ctx, 8644 nft_trans_rule(trans), 8645 NFT_MSG_DELRULE); 8646 nft_rule_expr_deactivate(&trans->ctx, 8647 nft_trans_rule(trans), 8648 NFT_TRANS_COMMIT); 8649 break; 8650 case NFT_MSG_NEWSET: 8651 nft_clear(net, nft_trans_set(trans)); 8652 /* This avoids hitting -EBUSY when deleting the table 8653 * from the transaction. 8654 */ 8655 if (nft_set_is_anonymous(nft_trans_set(trans)) && 8656 !list_empty(&nft_trans_set(trans)->bindings)) 8657 trans->ctx.table->use--; 8658 8659 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), 8660 NFT_MSG_NEWSET, GFP_KERNEL); 8661 nft_trans_destroy(trans); 8662 break; 8663 case NFT_MSG_DELSET: 8664 list_del_rcu(&nft_trans_set(trans)->list); 8665 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), 8666 NFT_MSG_DELSET, GFP_KERNEL); 8667 break; 8668 case NFT_MSG_NEWSETELEM: 8669 te = (struct nft_trans_elem *)trans->data; 8670 8671 nft_setelem_activate(net, te->set, &te->elem); 8672 nf_tables_setelem_notify(&trans->ctx, te->set, 8673 &te->elem, 8674 NFT_MSG_NEWSETELEM); 8675 nft_trans_destroy(trans); 8676 break; 8677 case NFT_MSG_DELSETELEM: 8678 te = (struct nft_trans_elem *)trans->data; 8679 8680 nf_tables_setelem_notify(&trans->ctx, te->set, 8681 &te->elem, 8682 NFT_MSG_DELSETELEM); 8683 nft_setelem_remove(net, te->set, &te->elem); 8684 if (!nft_setelem_is_catchall(te->set, &te->elem)) { 8685 atomic_dec(&te->set->nelems); 8686 te->set->ndeact--; 8687 } 8688 break; 8689 case NFT_MSG_NEWOBJ: 8690 if (nft_trans_obj_update(trans)) { 8691 nft_obj_commit_update(trans); 8692 nf_tables_obj_notify(&trans->ctx, 8693 nft_trans_obj(trans), 8694 NFT_MSG_NEWOBJ); 8695 } else { 8696 nft_clear(net, nft_trans_obj(trans)); 8697 nf_tables_obj_notify(&trans->ctx, 8698 nft_trans_obj(trans), 8699 NFT_MSG_NEWOBJ); 8700 nft_trans_destroy(trans); 8701 } 8702 break; 8703 case NFT_MSG_DELOBJ: 8704 nft_obj_del(nft_trans_obj(trans)); 8705 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), 8706 NFT_MSG_DELOBJ); 8707 break; 8708 case NFT_MSG_NEWFLOWTABLE: 8709 if (nft_trans_flowtable_update(trans)) { 8710 nft_trans_flowtable(trans)->data.flags = 8711 nft_trans_flowtable_flags(trans); 8712 nf_tables_flowtable_notify(&trans->ctx, 8713 nft_trans_flowtable(trans), 8714 &nft_trans_flowtable_hooks(trans), 8715 NFT_MSG_NEWFLOWTABLE); 8716 list_splice(&nft_trans_flowtable_hooks(trans), 8717 &nft_trans_flowtable(trans)->hook_list); 8718 } else { 8719 nft_clear(net, nft_trans_flowtable(trans)); 8720 nf_tables_flowtable_notify(&trans->ctx, 8721 nft_trans_flowtable(trans), 8722 &nft_trans_flowtable(trans)->hook_list, 8723 NFT_MSG_NEWFLOWTABLE); 8724 } 8725 nft_trans_destroy(trans); 8726 break; 8727 case NFT_MSG_DELFLOWTABLE: 8728 if (nft_trans_flowtable_update(trans)) { 8729 nft_flowtable_hooks_del(nft_trans_flowtable(trans), 8730 &nft_trans_flowtable_hooks(trans)); 8731 nf_tables_flowtable_notify(&trans->ctx, 8732 nft_trans_flowtable(trans), 8733 &nft_trans_flowtable_hooks(trans), 8734 NFT_MSG_DELFLOWTABLE); 8735 nft_unregister_flowtable_net_hooks(net, 8736 &nft_trans_flowtable_hooks(trans)); 8737 } else { 8738 list_del_rcu(&nft_trans_flowtable(trans)->list); 8739 nf_tables_flowtable_notify(&trans->ctx, 8740 nft_trans_flowtable(trans), 8741 &nft_trans_flowtable(trans)->hook_list, 8742 NFT_MSG_DELFLOWTABLE); 8743 nft_unregister_flowtable_net_hooks(net, 8744 &nft_trans_flowtable(trans)->hook_list); 8745 } 8746 break; 8747 } 8748 } 8749 8750 nft_commit_notify(net, NETLINK_CB(skb).portid); 8751 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); 8752 nf_tables_commit_audit_log(&adl, nft_net->base_seq); 8753 nf_tables_commit_release(net); 8754 8755 return 0; 8756 } 8757 8758 static void nf_tables_module_autoload(struct net *net) 8759 { 8760 struct nftables_pernet *nft_net = nft_pernet(net); 8761 struct nft_module_request *req, *next; 8762 LIST_HEAD(module_list); 8763 8764 list_splice_init(&nft_net->module_list, &module_list); 8765 mutex_unlock(&nft_net->commit_mutex); 8766 list_for_each_entry_safe(req, next, &module_list, list) { 8767 request_module("%s", req->module); 8768 req->done = true; 8769 } 8770 mutex_lock(&nft_net->commit_mutex); 8771 list_splice(&module_list, &nft_net->module_list); 8772 } 8773 8774 static void nf_tables_abort_release(struct nft_trans *trans) 8775 { 8776 switch (trans->msg_type) { 8777 case NFT_MSG_NEWTABLE: 8778 nf_tables_table_destroy(&trans->ctx); 8779 break; 8780 case NFT_MSG_NEWCHAIN: 8781 nf_tables_chain_destroy(&trans->ctx); 8782 break; 8783 case NFT_MSG_NEWRULE: 8784 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); 8785 break; 8786 case NFT_MSG_NEWSET: 8787 nft_set_destroy(&trans->ctx, nft_trans_set(trans)); 8788 break; 8789 case NFT_MSG_NEWSETELEM: 8790 nft_set_elem_destroy(nft_trans_elem_set(trans), 8791 nft_trans_elem(trans).priv, true); 8792 break; 8793 case NFT_MSG_NEWOBJ: 8794 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); 8795 break; 8796 case NFT_MSG_NEWFLOWTABLE: 8797 if (nft_trans_flowtable_update(trans)) 8798 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans)); 8799 else 8800 nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); 8801 break; 8802 } 8803 kfree(trans); 8804 } 8805 8806 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action) 8807 { 8808 struct nftables_pernet *nft_net = nft_pernet(net); 8809 struct nft_trans *trans, *next; 8810 struct nft_trans_elem *te; 8811 struct nft_hook *hook; 8812 8813 if (action == NFNL_ABORT_VALIDATE && 8814 nf_tables_validate(net) < 0) 8815 return -EAGAIN; 8816 8817 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list, 8818 list) { 8819 switch (trans->msg_type) { 8820 case NFT_MSG_NEWTABLE: 8821 if (nft_trans_table_update(trans)) { 8822 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) { 8823 nft_trans_destroy(trans); 8824 break; 8825 } 8826 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) { 8827 nf_tables_table_disable(net, trans->ctx.table); 8828 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; 8829 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) { 8830 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT; 8831 } 8832 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE; 8833 nft_trans_destroy(trans); 8834 } else { 8835 list_del_rcu(&trans->ctx.table->list); 8836 } 8837 break; 8838 case NFT_MSG_DELTABLE: 8839 nft_clear(trans->ctx.net, trans->ctx.table); 8840 nft_trans_destroy(trans); 8841 break; 8842 case NFT_MSG_NEWCHAIN: 8843 if (nft_trans_chain_update(trans)) { 8844 free_percpu(nft_trans_chain_stats(trans)); 8845 kfree(nft_trans_chain_name(trans)); 8846 nft_trans_destroy(trans); 8847 } else { 8848 if (nft_chain_is_bound(trans->ctx.chain)) { 8849 nft_trans_destroy(trans); 8850 break; 8851 } 8852 trans->ctx.table->use--; 8853 nft_chain_del(trans->ctx.chain); 8854 nf_tables_unregister_hook(trans->ctx.net, 8855 trans->ctx.table, 8856 trans->ctx.chain); 8857 } 8858 break; 8859 case NFT_MSG_DELCHAIN: 8860 trans->ctx.table->use++; 8861 nft_clear(trans->ctx.net, trans->ctx.chain); 8862 nft_trans_destroy(trans); 8863 break; 8864 case NFT_MSG_NEWRULE: 8865 trans->ctx.chain->use--; 8866 list_del_rcu(&nft_trans_rule(trans)->list); 8867 nft_rule_expr_deactivate(&trans->ctx, 8868 nft_trans_rule(trans), 8869 NFT_TRANS_ABORT); 8870 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 8871 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 8872 break; 8873 case NFT_MSG_DELRULE: 8874 trans->ctx.chain->use++; 8875 nft_clear(trans->ctx.net, nft_trans_rule(trans)); 8876 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans)); 8877 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 8878 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 8879 8880 nft_trans_destroy(trans); 8881 break; 8882 case NFT_MSG_NEWSET: 8883 trans->ctx.table->use--; 8884 if (nft_trans_set_bound(trans)) { 8885 nft_trans_destroy(trans); 8886 break; 8887 } 8888 list_del_rcu(&nft_trans_set(trans)->list); 8889 break; 8890 case NFT_MSG_DELSET: 8891 trans->ctx.table->use++; 8892 nft_clear(trans->ctx.net, nft_trans_set(trans)); 8893 nft_trans_destroy(trans); 8894 break; 8895 case NFT_MSG_NEWSETELEM: 8896 if (nft_trans_elem_set_bound(trans)) { 8897 nft_trans_destroy(trans); 8898 break; 8899 } 8900 te = (struct nft_trans_elem *)trans->data; 8901 nft_setelem_remove(net, te->set, &te->elem); 8902 if (!nft_setelem_is_catchall(te->set, &te->elem)) 8903 atomic_dec(&te->set->nelems); 8904 break; 8905 case NFT_MSG_DELSETELEM: 8906 te = (struct nft_trans_elem *)trans->data; 8907 8908 nft_setelem_data_activate(net, te->set, &te->elem); 8909 nft_setelem_activate(net, te->set, &te->elem); 8910 if (!nft_setelem_is_catchall(te->set, &te->elem)) 8911 te->set->ndeact--; 8912 8913 nft_trans_destroy(trans); 8914 break; 8915 case NFT_MSG_NEWOBJ: 8916 if (nft_trans_obj_update(trans)) { 8917 kfree(nft_trans_obj_newobj(trans)); 8918 nft_trans_destroy(trans); 8919 } else { 8920 trans->ctx.table->use--; 8921 nft_obj_del(nft_trans_obj(trans)); 8922 } 8923 break; 8924 case NFT_MSG_DELOBJ: 8925 trans->ctx.table->use++; 8926 nft_clear(trans->ctx.net, nft_trans_obj(trans)); 8927 nft_trans_destroy(trans); 8928 break; 8929 case NFT_MSG_NEWFLOWTABLE: 8930 if (nft_trans_flowtable_update(trans)) { 8931 nft_unregister_flowtable_net_hooks(net, 8932 &nft_trans_flowtable_hooks(trans)); 8933 } else { 8934 trans->ctx.table->use--; 8935 list_del_rcu(&nft_trans_flowtable(trans)->list); 8936 nft_unregister_flowtable_net_hooks(net, 8937 &nft_trans_flowtable(trans)->hook_list); 8938 } 8939 break; 8940 case NFT_MSG_DELFLOWTABLE: 8941 if (nft_trans_flowtable_update(trans)) { 8942 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list) 8943 hook->inactive = false; 8944 } else { 8945 trans->ctx.table->use++; 8946 nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); 8947 } 8948 nft_trans_destroy(trans); 8949 break; 8950 } 8951 } 8952 8953 synchronize_rcu(); 8954 8955 list_for_each_entry_safe_reverse(trans, next, 8956 &nft_net->commit_list, list) { 8957 list_del(&trans->list); 8958 nf_tables_abort_release(trans); 8959 } 8960 8961 if (action == NFNL_ABORT_AUTOLOAD) 8962 nf_tables_module_autoload(net); 8963 else 8964 nf_tables_module_autoload_cleanup(net); 8965 8966 return 0; 8967 } 8968 8969 static void nf_tables_cleanup(struct net *net) 8970 { 8971 nft_validate_state_update(net, NFT_VALIDATE_SKIP); 8972 } 8973 8974 static int nf_tables_abort(struct net *net, struct sk_buff *skb, 8975 enum nfnl_abort_action action) 8976 { 8977 struct nftables_pernet *nft_net = nft_pernet(net); 8978 int ret = __nf_tables_abort(net, action); 8979 8980 mutex_unlock(&nft_net->commit_mutex); 8981 8982 return ret; 8983 } 8984 8985 static bool nf_tables_valid_genid(struct net *net, u32 genid) 8986 { 8987 struct nftables_pernet *nft_net = nft_pernet(net); 8988 bool genid_ok; 8989 8990 mutex_lock(&nft_net->commit_mutex); 8991 8992 genid_ok = genid == 0 || nft_net->base_seq == genid; 8993 if (!genid_ok) 8994 mutex_unlock(&nft_net->commit_mutex); 8995 8996 /* else, commit mutex has to be released by commit or abort function */ 8997 return genid_ok; 8998 } 8999 9000 static const struct nfnetlink_subsystem nf_tables_subsys = { 9001 .name = "nf_tables", 9002 .subsys_id = NFNL_SUBSYS_NFTABLES, 9003 .cb_count = NFT_MSG_MAX, 9004 .cb = nf_tables_cb, 9005 .commit = nf_tables_commit, 9006 .abort = nf_tables_abort, 9007 .cleanup = nf_tables_cleanup, 9008 .valid_genid = nf_tables_valid_genid, 9009 .owner = THIS_MODULE, 9010 }; 9011 9012 int nft_chain_validate_dependency(const struct nft_chain *chain, 9013 enum nft_chain_types type) 9014 { 9015 const struct nft_base_chain *basechain; 9016 9017 if (nft_is_base_chain(chain)) { 9018 basechain = nft_base_chain(chain); 9019 if (basechain->type->type != type) 9020 return -EOPNOTSUPP; 9021 } 9022 return 0; 9023 } 9024 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); 9025 9026 int nft_chain_validate_hooks(const struct nft_chain *chain, 9027 unsigned int hook_flags) 9028 { 9029 struct nft_base_chain *basechain; 9030 9031 if (nft_is_base_chain(chain)) { 9032 basechain = nft_base_chain(chain); 9033 9034 if ((1 << basechain->ops.hooknum) & hook_flags) 9035 return 0; 9036 9037 return -EOPNOTSUPP; 9038 } 9039 9040 return 0; 9041 } 9042 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); 9043 9044 /* 9045 * Loop detection - walk through the ruleset beginning at the destination chain 9046 * of a new jump until either the source chain is reached (loop) or all 9047 * reachable chains have been traversed. 9048 * 9049 * The loop check is performed whenever a new jump verdict is added to an 9050 * expression or verdict map or a verdict map is bound to a new chain. 9051 */ 9052 9053 static int nf_tables_check_loops(const struct nft_ctx *ctx, 9054 const struct nft_chain *chain); 9055 9056 static int nft_check_loops(const struct nft_ctx *ctx, 9057 const struct nft_set_ext *ext) 9058 { 9059 const struct nft_data *data; 9060 int ret; 9061 9062 data = nft_set_ext_data(ext); 9063 switch (data->verdict.code) { 9064 case NFT_JUMP: 9065 case NFT_GOTO: 9066 ret = nf_tables_check_loops(ctx, data->verdict.chain); 9067 break; 9068 default: 9069 ret = 0; 9070 break; 9071 } 9072 9073 return ret; 9074 } 9075 9076 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, 9077 struct nft_set *set, 9078 const struct nft_set_iter *iter, 9079 struct nft_set_elem *elem) 9080 { 9081 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 9082 9083 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 9084 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) 9085 return 0; 9086 9087 return nft_check_loops(ctx, ext); 9088 } 9089 9090 static int nft_set_catchall_loops(const struct nft_ctx *ctx, 9091 struct nft_set *set) 9092 { 9093 u8 genmask = nft_genmask_next(ctx->net); 9094 struct nft_set_elem_catchall *catchall; 9095 struct nft_set_ext *ext; 9096 int ret = 0; 9097 9098 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 9099 ext = nft_set_elem_ext(set, catchall->elem); 9100 if (!nft_set_elem_active(ext, genmask)) 9101 continue; 9102 9103 ret = nft_check_loops(ctx, ext); 9104 if (ret < 0) 9105 return ret; 9106 } 9107 9108 return ret; 9109 } 9110 9111 static int nf_tables_check_loops(const struct nft_ctx *ctx, 9112 const struct nft_chain *chain) 9113 { 9114 const struct nft_rule *rule; 9115 const struct nft_expr *expr, *last; 9116 struct nft_set *set; 9117 struct nft_set_binding *binding; 9118 struct nft_set_iter iter; 9119 9120 if (ctx->chain == chain) 9121 return -ELOOP; 9122 9123 list_for_each_entry(rule, &chain->rules, list) { 9124 nft_rule_for_each_expr(expr, last, rule) { 9125 struct nft_immediate_expr *priv; 9126 const struct nft_data *data; 9127 int err; 9128 9129 if (strcmp(expr->ops->type->name, "immediate")) 9130 continue; 9131 9132 priv = nft_expr_priv(expr); 9133 if (priv->dreg != NFT_REG_VERDICT) 9134 continue; 9135 9136 data = &priv->data; 9137 switch (data->verdict.code) { 9138 case NFT_JUMP: 9139 case NFT_GOTO: 9140 err = nf_tables_check_loops(ctx, 9141 data->verdict.chain); 9142 if (err < 0) 9143 return err; 9144 break; 9145 default: 9146 break; 9147 } 9148 } 9149 } 9150 9151 list_for_each_entry(set, &ctx->table->sets, list) { 9152 if (!nft_is_active_next(ctx->net, set)) 9153 continue; 9154 if (!(set->flags & NFT_SET_MAP) || 9155 set->dtype != NFT_DATA_VERDICT) 9156 continue; 9157 9158 list_for_each_entry(binding, &set->bindings, list) { 9159 if (!(binding->flags & NFT_SET_MAP) || 9160 binding->chain != chain) 9161 continue; 9162 9163 iter.genmask = nft_genmask_next(ctx->net); 9164 iter.skip = 0; 9165 iter.count = 0; 9166 iter.err = 0; 9167 iter.fn = nf_tables_loop_check_setelem; 9168 9169 set->ops->walk(ctx, set, &iter); 9170 if (!iter.err) 9171 iter.err = nft_set_catchall_loops(ctx, set); 9172 9173 if (iter.err < 0) 9174 return iter.err; 9175 } 9176 } 9177 9178 return 0; 9179 } 9180 9181 /** 9182 * nft_parse_u32_check - fetch u32 attribute and check for maximum value 9183 * 9184 * @attr: netlink attribute to fetch value from 9185 * @max: maximum value to be stored in dest 9186 * @dest: pointer to the variable 9187 * 9188 * Parse, check and store a given u32 netlink attribute into variable. 9189 * This function returns -ERANGE if the value goes over maximum value. 9190 * Otherwise a 0 is returned and the attribute value is stored in the 9191 * destination variable. 9192 */ 9193 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) 9194 { 9195 u32 val; 9196 9197 val = ntohl(nla_get_be32(attr)); 9198 if (val > max) 9199 return -ERANGE; 9200 9201 *dest = val; 9202 return 0; 9203 } 9204 EXPORT_SYMBOL_GPL(nft_parse_u32_check); 9205 9206 static unsigned int nft_parse_register(const struct nlattr *attr) 9207 { 9208 unsigned int reg; 9209 9210 reg = ntohl(nla_get_be32(attr)); 9211 switch (reg) { 9212 case NFT_REG_VERDICT...NFT_REG_4: 9213 return reg * NFT_REG_SIZE / NFT_REG32_SIZE; 9214 default: 9215 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; 9216 } 9217 } 9218 9219 /** 9220 * nft_dump_register - dump a register value to a netlink attribute 9221 * 9222 * @skb: socket buffer 9223 * @attr: attribute number 9224 * @reg: register number 9225 * 9226 * Construct a netlink attribute containing the register number. For 9227 * compatibility reasons, register numbers being a multiple of 4 are 9228 * translated to the corresponding 128 bit register numbers. 9229 */ 9230 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) 9231 { 9232 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) 9233 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); 9234 else 9235 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; 9236 9237 return nla_put_be32(skb, attr, htonl(reg)); 9238 } 9239 EXPORT_SYMBOL_GPL(nft_dump_register); 9240 9241 static int nft_validate_register_load(enum nft_registers reg, unsigned int len) 9242 { 9243 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) 9244 return -EINVAL; 9245 if (len == 0) 9246 return -EINVAL; 9247 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data)) 9248 return -ERANGE; 9249 9250 return 0; 9251 } 9252 9253 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len) 9254 { 9255 u32 reg; 9256 int err; 9257 9258 reg = nft_parse_register(attr); 9259 err = nft_validate_register_load(reg, len); 9260 if (err < 0) 9261 return err; 9262 9263 *sreg = reg; 9264 return 0; 9265 } 9266 EXPORT_SYMBOL_GPL(nft_parse_register_load); 9267 9268 static int nft_validate_register_store(const struct nft_ctx *ctx, 9269 enum nft_registers reg, 9270 const struct nft_data *data, 9271 enum nft_data_types type, 9272 unsigned int len) 9273 { 9274 int err; 9275 9276 switch (reg) { 9277 case NFT_REG_VERDICT: 9278 if (type != NFT_DATA_VERDICT) 9279 return -EINVAL; 9280 9281 if (data != NULL && 9282 (data->verdict.code == NFT_GOTO || 9283 data->verdict.code == NFT_JUMP)) { 9284 err = nf_tables_check_loops(ctx, data->verdict.chain); 9285 if (err < 0) 9286 return err; 9287 } 9288 9289 return 0; 9290 default: 9291 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) 9292 return -EINVAL; 9293 if (len == 0) 9294 return -EINVAL; 9295 if (reg * NFT_REG32_SIZE + len > 9296 sizeof_field(struct nft_regs, data)) 9297 return -ERANGE; 9298 9299 if (data != NULL && type != NFT_DATA_VALUE) 9300 return -EINVAL; 9301 return 0; 9302 } 9303 } 9304 9305 int nft_parse_register_store(const struct nft_ctx *ctx, 9306 const struct nlattr *attr, u8 *dreg, 9307 const struct nft_data *data, 9308 enum nft_data_types type, unsigned int len) 9309 { 9310 int err; 9311 u32 reg; 9312 9313 reg = nft_parse_register(attr); 9314 err = nft_validate_register_store(ctx, reg, data, type, len); 9315 if (err < 0) 9316 return err; 9317 9318 *dreg = reg; 9319 return 0; 9320 } 9321 EXPORT_SYMBOL_GPL(nft_parse_register_store); 9322 9323 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { 9324 [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, 9325 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, 9326 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 9327 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 }, 9328 }; 9329 9330 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, 9331 struct nft_data_desc *desc, const struct nlattr *nla) 9332 { 9333 u8 genmask = nft_genmask_next(ctx->net); 9334 struct nlattr *tb[NFTA_VERDICT_MAX + 1]; 9335 struct nft_chain *chain; 9336 int err; 9337 9338 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla, 9339 nft_verdict_policy, NULL); 9340 if (err < 0) 9341 return err; 9342 9343 if (!tb[NFTA_VERDICT_CODE]) 9344 return -EINVAL; 9345 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); 9346 9347 switch (data->verdict.code) { 9348 default: 9349 switch (data->verdict.code & NF_VERDICT_MASK) { 9350 case NF_ACCEPT: 9351 case NF_DROP: 9352 case NF_QUEUE: 9353 break; 9354 default: 9355 return -EINVAL; 9356 } 9357 fallthrough; 9358 case NFT_CONTINUE: 9359 case NFT_BREAK: 9360 case NFT_RETURN: 9361 break; 9362 case NFT_JUMP: 9363 case NFT_GOTO: 9364 if (tb[NFTA_VERDICT_CHAIN]) { 9365 chain = nft_chain_lookup(ctx->net, ctx->table, 9366 tb[NFTA_VERDICT_CHAIN], 9367 genmask); 9368 } else if (tb[NFTA_VERDICT_CHAIN_ID]) { 9369 chain = nft_chain_lookup_byid(ctx->net, 9370 tb[NFTA_VERDICT_CHAIN_ID]); 9371 if (IS_ERR(chain)) 9372 return PTR_ERR(chain); 9373 } else { 9374 return -EINVAL; 9375 } 9376 9377 if (IS_ERR(chain)) 9378 return PTR_ERR(chain); 9379 if (nft_is_base_chain(chain)) 9380 return -EOPNOTSUPP; 9381 9382 chain->use++; 9383 data->verdict.chain = chain; 9384 break; 9385 } 9386 9387 desc->len = sizeof(data->verdict); 9388 desc->type = NFT_DATA_VERDICT; 9389 return 0; 9390 } 9391 9392 static void nft_verdict_uninit(const struct nft_data *data) 9393 { 9394 struct nft_chain *chain; 9395 struct nft_rule *rule; 9396 9397 switch (data->verdict.code) { 9398 case NFT_JUMP: 9399 case NFT_GOTO: 9400 chain = data->verdict.chain; 9401 chain->use--; 9402 9403 if (!nft_chain_is_bound(chain)) 9404 break; 9405 9406 chain->table->use--; 9407 list_for_each_entry(rule, &chain->rules, list) 9408 chain->use--; 9409 9410 nft_chain_del(chain); 9411 break; 9412 } 9413 } 9414 9415 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) 9416 { 9417 struct nlattr *nest; 9418 9419 nest = nla_nest_start_noflag(skb, type); 9420 if (!nest) 9421 goto nla_put_failure; 9422 9423 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) 9424 goto nla_put_failure; 9425 9426 switch (v->code) { 9427 case NFT_JUMP: 9428 case NFT_GOTO: 9429 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, 9430 v->chain->name)) 9431 goto nla_put_failure; 9432 } 9433 nla_nest_end(skb, nest); 9434 return 0; 9435 9436 nla_put_failure: 9437 return -1; 9438 } 9439 9440 static int nft_value_init(const struct nft_ctx *ctx, 9441 struct nft_data *data, unsigned int size, 9442 struct nft_data_desc *desc, const struct nlattr *nla) 9443 { 9444 unsigned int len; 9445 9446 len = nla_len(nla); 9447 if (len == 0) 9448 return -EINVAL; 9449 if (len > size) 9450 return -EOVERFLOW; 9451 9452 nla_memcpy(data->data, nla, len); 9453 desc->type = NFT_DATA_VALUE; 9454 desc->len = len; 9455 return 0; 9456 } 9457 9458 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, 9459 unsigned int len) 9460 { 9461 return nla_put(skb, NFTA_DATA_VALUE, len, data->data); 9462 } 9463 9464 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { 9465 [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, 9466 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, 9467 }; 9468 9469 /** 9470 * nft_data_init - parse nf_tables data netlink attributes 9471 * 9472 * @ctx: context of the expression using the data 9473 * @data: destination struct nft_data 9474 * @size: maximum data length 9475 * @desc: data description 9476 * @nla: netlink attribute containing data 9477 * 9478 * Parse the netlink data attributes and initialize a struct nft_data. 9479 * The type and length of data are returned in the data description. 9480 * 9481 * The caller can indicate that it only wants to accept data of type 9482 * NFT_DATA_VALUE by passing NULL for the ctx argument. 9483 */ 9484 int nft_data_init(const struct nft_ctx *ctx, 9485 struct nft_data *data, unsigned int size, 9486 struct nft_data_desc *desc, const struct nlattr *nla) 9487 { 9488 struct nlattr *tb[NFTA_DATA_MAX + 1]; 9489 int err; 9490 9491 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla, 9492 nft_data_policy, NULL); 9493 if (err < 0) 9494 return err; 9495 9496 if (tb[NFTA_DATA_VALUE]) 9497 return nft_value_init(ctx, data, size, desc, 9498 tb[NFTA_DATA_VALUE]); 9499 if (tb[NFTA_DATA_VERDICT] && ctx != NULL) 9500 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); 9501 return -EINVAL; 9502 } 9503 EXPORT_SYMBOL_GPL(nft_data_init); 9504 9505 /** 9506 * nft_data_release - release a nft_data item 9507 * 9508 * @data: struct nft_data to release 9509 * @type: type of data 9510 * 9511 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, 9512 * all others need to be released by calling this function. 9513 */ 9514 void nft_data_release(const struct nft_data *data, enum nft_data_types type) 9515 { 9516 if (type < NFT_DATA_VERDICT) 9517 return; 9518 switch (type) { 9519 case NFT_DATA_VERDICT: 9520 return nft_verdict_uninit(data); 9521 default: 9522 WARN_ON(1); 9523 } 9524 } 9525 EXPORT_SYMBOL_GPL(nft_data_release); 9526 9527 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 9528 enum nft_data_types type, unsigned int len) 9529 { 9530 struct nlattr *nest; 9531 int err; 9532 9533 nest = nla_nest_start_noflag(skb, attr); 9534 if (nest == NULL) 9535 return -1; 9536 9537 switch (type) { 9538 case NFT_DATA_VALUE: 9539 err = nft_value_dump(skb, data, len); 9540 break; 9541 case NFT_DATA_VERDICT: 9542 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); 9543 break; 9544 default: 9545 err = -EINVAL; 9546 WARN_ON(1); 9547 } 9548 9549 nla_nest_end(skb, nest); 9550 return err; 9551 } 9552 EXPORT_SYMBOL_GPL(nft_data_dump); 9553 9554 int __nft_release_basechain(struct nft_ctx *ctx) 9555 { 9556 struct nft_rule *rule, *nr; 9557 9558 if (WARN_ON(!nft_is_base_chain(ctx->chain))) 9559 return 0; 9560 9561 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); 9562 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { 9563 list_del(&rule->list); 9564 ctx->chain->use--; 9565 nf_tables_rule_release(ctx, rule); 9566 } 9567 nft_chain_del(ctx->chain); 9568 ctx->table->use--; 9569 nf_tables_chain_destroy(ctx); 9570 9571 return 0; 9572 } 9573 EXPORT_SYMBOL_GPL(__nft_release_basechain); 9574 9575 static void __nft_release_hook(struct net *net, struct nft_table *table) 9576 { 9577 struct nft_chain *chain; 9578 9579 list_for_each_entry(chain, &table->chains, list) 9580 nf_tables_unregister_hook(net, table, chain); 9581 } 9582 9583 static void __nft_release_hooks(struct net *net) 9584 { 9585 struct nftables_pernet *nft_net = nft_pernet(net); 9586 struct nft_table *table; 9587 9588 list_for_each_entry(table, &nft_net->tables, list) { 9589 if (nft_table_has_owner(table)) 9590 continue; 9591 9592 __nft_release_hook(net, table); 9593 } 9594 } 9595 9596 static void __nft_release_table(struct net *net, struct nft_table *table) 9597 { 9598 struct nft_flowtable *flowtable, *nf; 9599 struct nft_chain *chain, *nc; 9600 struct nft_object *obj, *ne; 9601 struct nft_rule *rule, *nr; 9602 struct nft_set *set, *ns; 9603 struct nft_ctx ctx = { 9604 .net = net, 9605 .family = NFPROTO_NETDEV, 9606 }; 9607 9608 ctx.family = table->family; 9609 ctx.table = table; 9610 list_for_each_entry(chain, &table->chains, list) { 9611 ctx.chain = chain; 9612 list_for_each_entry_safe(rule, nr, &chain->rules, list) { 9613 list_del(&rule->list); 9614 chain->use--; 9615 nf_tables_rule_release(&ctx, rule); 9616 } 9617 } 9618 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { 9619 list_del(&flowtable->list); 9620 table->use--; 9621 nf_tables_flowtable_destroy(flowtable); 9622 } 9623 list_for_each_entry_safe(set, ns, &table->sets, list) { 9624 list_del(&set->list); 9625 table->use--; 9626 nft_set_destroy(&ctx, set); 9627 } 9628 list_for_each_entry_safe(obj, ne, &table->objects, list) { 9629 nft_obj_del(obj); 9630 table->use--; 9631 nft_obj_destroy(&ctx, obj); 9632 } 9633 list_for_each_entry_safe(chain, nc, &table->chains, list) { 9634 ctx.chain = chain; 9635 nft_chain_del(chain); 9636 table->use--; 9637 nf_tables_chain_destroy(&ctx); 9638 } 9639 nf_tables_table_destroy(&ctx); 9640 } 9641 9642 static void __nft_release_tables(struct net *net) 9643 { 9644 struct nftables_pernet *nft_net = nft_pernet(net); 9645 struct nft_table *table, *nt; 9646 9647 list_for_each_entry_safe(table, nt, &nft_net->tables, list) { 9648 if (nft_table_has_owner(table)) 9649 continue; 9650 9651 list_del(&table->list); 9652 9653 __nft_release_table(net, table); 9654 } 9655 } 9656 9657 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event, 9658 void *ptr) 9659 { 9660 struct nft_table *table, *to_delete[8]; 9661 struct nftables_pernet *nft_net; 9662 struct netlink_notify *n = ptr; 9663 struct net *net = n->net; 9664 unsigned int deleted; 9665 bool restart = false; 9666 9667 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER) 9668 return NOTIFY_DONE; 9669 9670 nft_net = nft_pernet(net); 9671 deleted = 0; 9672 mutex_lock(&nft_net->commit_mutex); 9673 again: 9674 list_for_each_entry(table, &nft_net->tables, list) { 9675 if (nft_table_has_owner(table) && 9676 n->portid == table->nlpid) { 9677 __nft_release_hook(net, table); 9678 list_del_rcu(&table->list); 9679 to_delete[deleted++] = table; 9680 if (deleted >= ARRAY_SIZE(to_delete)) 9681 break; 9682 } 9683 } 9684 if (deleted) { 9685 restart = deleted >= ARRAY_SIZE(to_delete); 9686 synchronize_rcu(); 9687 while (deleted) 9688 __nft_release_table(net, to_delete[--deleted]); 9689 9690 if (restart) 9691 goto again; 9692 } 9693 mutex_unlock(&nft_net->commit_mutex); 9694 9695 return NOTIFY_DONE; 9696 } 9697 9698 static struct notifier_block nft_nl_notifier = { 9699 .notifier_call = nft_rcv_nl_event, 9700 }; 9701 9702 static int __net_init nf_tables_init_net(struct net *net) 9703 { 9704 struct nftables_pernet *nft_net = nft_pernet(net); 9705 9706 INIT_LIST_HEAD(&nft_net->tables); 9707 INIT_LIST_HEAD(&nft_net->commit_list); 9708 INIT_LIST_HEAD(&nft_net->module_list); 9709 INIT_LIST_HEAD(&nft_net->notify_list); 9710 mutex_init(&nft_net->commit_mutex); 9711 nft_net->base_seq = 1; 9712 nft_net->validate_state = NFT_VALIDATE_SKIP; 9713 9714 return 0; 9715 } 9716 9717 static void __net_exit nf_tables_pre_exit_net(struct net *net) 9718 { 9719 __nft_release_hooks(net); 9720 } 9721 9722 static void __net_exit nf_tables_exit_net(struct net *net) 9723 { 9724 struct nftables_pernet *nft_net = nft_pernet(net); 9725 9726 mutex_lock(&nft_net->commit_mutex); 9727 if (!list_empty(&nft_net->commit_list)) 9728 __nf_tables_abort(net, NFNL_ABORT_NONE); 9729 __nft_release_tables(net); 9730 mutex_unlock(&nft_net->commit_mutex); 9731 WARN_ON_ONCE(!list_empty(&nft_net->tables)); 9732 WARN_ON_ONCE(!list_empty(&nft_net->module_list)); 9733 WARN_ON_ONCE(!list_empty(&nft_net->notify_list)); 9734 } 9735 9736 static struct pernet_operations nf_tables_net_ops = { 9737 .init = nf_tables_init_net, 9738 .pre_exit = nf_tables_pre_exit_net, 9739 .exit = nf_tables_exit_net, 9740 .id = &nf_tables_net_id, 9741 .size = sizeof(struct nftables_pernet), 9742 }; 9743 9744 static int __init nf_tables_module_init(void) 9745 { 9746 int err; 9747 9748 err = register_pernet_subsys(&nf_tables_net_ops); 9749 if (err < 0) 9750 return err; 9751 9752 err = nft_chain_filter_init(); 9753 if (err < 0) 9754 goto err_chain_filter; 9755 9756 err = nf_tables_core_module_init(); 9757 if (err < 0) 9758 goto err_core_module; 9759 9760 err = register_netdevice_notifier(&nf_tables_flowtable_notifier); 9761 if (err < 0) 9762 goto err_netdev_notifier; 9763 9764 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params); 9765 if (err < 0) 9766 goto err_rht_objname; 9767 9768 err = nft_offload_init(); 9769 if (err < 0) 9770 goto err_offload; 9771 9772 err = netlink_register_notifier(&nft_nl_notifier); 9773 if (err < 0) 9774 goto err_netlink_notifier; 9775 9776 /* must be last */ 9777 err = nfnetlink_subsys_register(&nf_tables_subsys); 9778 if (err < 0) 9779 goto err_nfnl_subsys; 9780 9781 nft_chain_route_init(); 9782 9783 return err; 9784 9785 err_nfnl_subsys: 9786 netlink_unregister_notifier(&nft_nl_notifier); 9787 err_netlink_notifier: 9788 nft_offload_exit(); 9789 err_offload: 9790 rhltable_destroy(&nft_objname_ht); 9791 err_rht_objname: 9792 unregister_netdevice_notifier(&nf_tables_flowtable_notifier); 9793 err_netdev_notifier: 9794 nf_tables_core_module_exit(); 9795 err_core_module: 9796 nft_chain_filter_fini(); 9797 err_chain_filter: 9798 unregister_pernet_subsys(&nf_tables_net_ops); 9799 return err; 9800 } 9801 9802 static void __exit nf_tables_module_exit(void) 9803 { 9804 nfnetlink_subsys_unregister(&nf_tables_subsys); 9805 netlink_unregister_notifier(&nft_nl_notifier); 9806 nft_offload_exit(); 9807 unregister_netdevice_notifier(&nf_tables_flowtable_notifier); 9808 nft_chain_filter_fini(); 9809 nft_chain_route_fini(); 9810 unregister_pernet_subsys(&nf_tables_net_ops); 9811 cancel_work_sync(&trans_destroy_work); 9812 rcu_barrier(); 9813 rhltable_destroy(&nft_objname_ht); 9814 nf_tables_core_module_exit(); 9815 } 9816 9817 module_init(nf_tables_module_init); 9818 module_exit(nf_tables_module_exit); 9819 9820 MODULE_LICENSE("GPL"); 9821 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 9822 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); 9823