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 bool release_netdev) 227 { 228 struct nft_hook *hook, *next; 229 230 list_for_each_entry_safe(hook, next, hook_list, list) { 231 nf_unregister_net_hook(net, &hook->ops); 232 if (release_netdev) { 233 list_del(&hook->list); 234 kfree_rcu(hook, rcu); 235 } 236 } 237 } 238 239 static int nf_tables_register_hook(struct net *net, 240 const struct nft_table *table, 241 struct nft_chain *chain) 242 { 243 struct nft_base_chain *basechain; 244 const struct nf_hook_ops *ops; 245 246 if (table->flags & NFT_TABLE_F_DORMANT || 247 !nft_is_base_chain(chain)) 248 return 0; 249 250 basechain = nft_base_chain(chain); 251 ops = &basechain->ops; 252 253 if (basechain->type->ops_register) 254 return basechain->type->ops_register(net, ops); 255 256 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) 257 return nft_netdev_register_hooks(net, &basechain->hook_list); 258 259 return nf_register_net_hook(net, &basechain->ops); 260 } 261 262 static void __nf_tables_unregister_hook(struct net *net, 263 const struct nft_table *table, 264 struct nft_chain *chain, 265 bool release_netdev) 266 { 267 struct nft_base_chain *basechain; 268 const struct nf_hook_ops *ops; 269 270 if (table->flags & NFT_TABLE_F_DORMANT || 271 !nft_is_base_chain(chain)) 272 return; 273 basechain = nft_base_chain(chain); 274 ops = &basechain->ops; 275 276 if (basechain->type->ops_unregister) 277 return basechain->type->ops_unregister(net, ops); 278 279 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) 280 nft_netdev_unregister_hooks(net, &basechain->hook_list, 281 release_netdev); 282 else 283 nf_unregister_net_hook(net, &basechain->ops); 284 } 285 286 static void nf_tables_unregister_hook(struct net *net, 287 const struct nft_table *table, 288 struct nft_chain *chain) 289 { 290 return __nf_tables_unregister_hook(net, table, chain, false); 291 } 292 293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans) 294 { 295 struct nftables_pernet *nft_net = nft_pernet(net); 296 297 list_add_tail(&trans->list, &nft_net->commit_list); 298 } 299 300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type) 301 { 302 struct nft_trans *trans; 303 304 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table)); 305 if (trans == NULL) 306 return -ENOMEM; 307 308 if (msg_type == NFT_MSG_NEWTABLE) 309 nft_activate_next(ctx->net, ctx->table); 310 311 nft_trans_commit_list_add_tail(ctx->net, trans); 312 return 0; 313 } 314 315 static int nft_deltable(struct nft_ctx *ctx) 316 { 317 int err; 318 319 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE); 320 if (err < 0) 321 return err; 322 323 nft_deactivate_next(ctx->net, ctx->table); 324 return err; 325 } 326 327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type) 328 { 329 struct nft_trans *trans; 330 331 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain)); 332 if (trans == NULL) 333 return ERR_PTR(-ENOMEM); 334 335 if (msg_type == NFT_MSG_NEWCHAIN) { 336 nft_activate_next(ctx->net, ctx->chain); 337 338 if (ctx->nla[NFTA_CHAIN_ID]) { 339 nft_trans_chain_id(trans) = 340 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID])); 341 } 342 } 343 344 nft_trans_commit_list_add_tail(ctx->net, trans); 345 return trans; 346 } 347 348 static int nft_delchain(struct nft_ctx *ctx) 349 { 350 struct nft_trans *trans; 351 352 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN); 353 if (IS_ERR(trans)) 354 return PTR_ERR(trans); 355 356 ctx->table->use--; 357 nft_deactivate_next(ctx->net, ctx->chain); 358 359 return 0; 360 } 361 362 static void nft_rule_expr_activate(const struct nft_ctx *ctx, 363 struct nft_rule *rule) 364 { 365 struct nft_expr *expr; 366 367 expr = nft_expr_first(rule); 368 while (nft_expr_more(rule, expr)) { 369 if (expr->ops->activate) 370 expr->ops->activate(ctx, expr); 371 372 expr = nft_expr_next(expr); 373 } 374 } 375 376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx, 377 struct nft_rule *rule, 378 enum nft_trans_phase phase) 379 { 380 struct nft_expr *expr; 381 382 expr = nft_expr_first(rule); 383 while (nft_expr_more(rule, expr)) { 384 if (expr->ops->deactivate) 385 expr->ops->deactivate(ctx, expr, phase); 386 387 expr = nft_expr_next(expr); 388 } 389 } 390 391 static int 392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule) 393 { 394 /* You cannot delete the same rule twice */ 395 if (nft_is_active_next(ctx->net, rule)) { 396 nft_deactivate_next(ctx->net, rule); 397 ctx->chain->use--; 398 return 0; 399 } 400 return -ENOENT; 401 } 402 403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type, 404 struct nft_rule *rule) 405 { 406 struct nft_trans *trans; 407 408 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule)); 409 if (trans == NULL) 410 return NULL; 411 412 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) { 413 nft_trans_rule_id(trans) = 414 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID])); 415 } 416 nft_trans_rule(trans) = rule; 417 nft_trans_commit_list_add_tail(ctx->net, trans); 418 419 return trans; 420 } 421 422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule) 423 { 424 struct nft_flow_rule *flow; 425 struct nft_trans *trans; 426 int err; 427 428 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule); 429 if (trans == NULL) 430 return -ENOMEM; 431 432 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) { 433 flow = nft_flow_rule_create(ctx->net, rule); 434 if (IS_ERR(flow)) { 435 nft_trans_destroy(trans); 436 return PTR_ERR(flow); 437 } 438 439 nft_trans_flow_rule(trans) = flow; 440 } 441 442 err = nf_tables_delrule_deactivate(ctx, rule); 443 if (err < 0) { 444 nft_trans_destroy(trans); 445 return err; 446 } 447 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE); 448 449 return 0; 450 } 451 452 static int nft_delrule_by_chain(struct nft_ctx *ctx) 453 { 454 struct nft_rule *rule; 455 int err; 456 457 list_for_each_entry(rule, &ctx->chain->rules, list) { 458 if (!nft_is_active_next(ctx->net, rule)) 459 continue; 460 461 err = nft_delrule(ctx, rule); 462 if (err < 0) 463 return err; 464 } 465 return 0; 466 } 467 468 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type, 469 struct nft_set *set) 470 { 471 struct nft_trans *trans; 472 473 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set)); 474 if (trans == NULL) 475 return -ENOMEM; 476 477 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) { 478 nft_trans_set_id(trans) = 479 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID])); 480 nft_activate_next(ctx->net, set); 481 } 482 nft_trans_set(trans) = set; 483 nft_trans_commit_list_add_tail(ctx->net, trans); 484 485 return 0; 486 } 487 488 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set) 489 { 490 int err; 491 492 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set); 493 if (err < 0) 494 return err; 495 496 nft_deactivate_next(ctx->net, set); 497 ctx->table->use--; 498 499 return err; 500 } 501 502 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type, 503 struct nft_object *obj) 504 { 505 struct nft_trans *trans; 506 507 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj)); 508 if (trans == NULL) 509 return -ENOMEM; 510 511 if (msg_type == NFT_MSG_NEWOBJ) 512 nft_activate_next(ctx->net, obj); 513 514 nft_trans_obj(trans) = obj; 515 nft_trans_commit_list_add_tail(ctx->net, trans); 516 517 return 0; 518 } 519 520 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj) 521 { 522 int err; 523 524 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj); 525 if (err < 0) 526 return err; 527 528 nft_deactivate_next(ctx->net, obj); 529 ctx->table->use--; 530 531 return err; 532 } 533 534 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type, 535 struct nft_flowtable *flowtable) 536 { 537 struct nft_trans *trans; 538 539 trans = nft_trans_alloc(ctx, msg_type, 540 sizeof(struct nft_trans_flowtable)); 541 if (trans == NULL) 542 return -ENOMEM; 543 544 if (msg_type == NFT_MSG_NEWFLOWTABLE) 545 nft_activate_next(ctx->net, flowtable); 546 547 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 548 nft_trans_flowtable(trans) = flowtable; 549 nft_trans_commit_list_add_tail(ctx->net, trans); 550 551 return 0; 552 } 553 554 static int nft_delflowtable(struct nft_ctx *ctx, 555 struct nft_flowtable *flowtable) 556 { 557 int err; 558 559 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable); 560 if (err < 0) 561 return err; 562 563 nft_deactivate_next(ctx->net, flowtable); 564 ctx->table->use--; 565 566 return err; 567 } 568 569 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg) 570 { 571 int i; 572 573 for (i = track->regs[dreg].num_reg; i > 0; i--) 574 __nft_reg_track_cancel(track, dreg - i); 575 } 576 577 static void __nft_reg_track_update(struct nft_regs_track *track, 578 const struct nft_expr *expr, 579 u8 dreg, u8 num_reg) 580 { 581 track->regs[dreg].selector = expr; 582 track->regs[dreg].bitwise = NULL; 583 track->regs[dreg].num_reg = num_reg; 584 } 585 586 void nft_reg_track_update(struct nft_regs_track *track, 587 const struct nft_expr *expr, u8 dreg, u8 len) 588 { 589 unsigned int regcount; 590 int i; 591 592 __nft_reg_track_clobber(track, dreg); 593 594 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE); 595 for (i = 0; i < regcount; i++, dreg++) 596 __nft_reg_track_update(track, expr, dreg, i); 597 } 598 EXPORT_SYMBOL_GPL(nft_reg_track_update); 599 600 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len) 601 { 602 unsigned int regcount; 603 int i; 604 605 __nft_reg_track_clobber(track, dreg); 606 607 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE); 608 for (i = 0; i < regcount; i++, dreg++) 609 __nft_reg_track_cancel(track, dreg); 610 } 611 EXPORT_SYMBOL_GPL(nft_reg_track_cancel); 612 613 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg) 614 { 615 track->regs[dreg].selector = NULL; 616 track->regs[dreg].bitwise = NULL; 617 track->regs[dreg].num_reg = 0; 618 } 619 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel); 620 621 /* 622 * Tables 623 */ 624 625 static struct nft_table *nft_table_lookup(const struct net *net, 626 const struct nlattr *nla, 627 u8 family, u8 genmask, u32 nlpid) 628 { 629 struct nftables_pernet *nft_net; 630 struct nft_table *table; 631 632 if (nla == NULL) 633 return ERR_PTR(-EINVAL); 634 635 nft_net = nft_pernet(net); 636 list_for_each_entry_rcu(table, &nft_net->tables, list, 637 lockdep_is_held(&nft_net->commit_mutex)) { 638 if (!nla_strcmp(nla, table->name) && 639 table->family == family && 640 nft_active_genmask(table, genmask)) { 641 if (nft_table_has_owner(table) && 642 nlpid && table->nlpid != nlpid) 643 return ERR_PTR(-EPERM); 644 645 return table; 646 } 647 } 648 649 return ERR_PTR(-ENOENT); 650 } 651 652 static struct nft_table *nft_table_lookup_byhandle(const struct net *net, 653 const struct nlattr *nla, 654 u8 genmask, u32 nlpid) 655 { 656 struct nftables_pernet *nft_net; 657 struct nft_table *table; 658 659 nft_net = nft_pernet(net); 660 list_for_each_entry(table, &nft_net->tables, list) { 661 if (be64_to_cpu(nla_get_be64(nla)) == table->handle && 662 nft_active_genmask(table, genmask)) { 663 if (nft_table_has_owner(table) && 664 nlpid && table->nlpid != nlpid) 665 return ERR_PTR(-EPERM); 666 667 return table; 668 } 669 } 670 671 return ERR_PTR(-ENOENT); 672 } 673 674 static inline u64 nf_tables_alloc_handle(struct nft_table *table) 675 { 676 return ++table->hgenerator; 677 } 678 679 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX]; 680 681 static const struct nft_chain_type * 682 __nft_chain_type_get(u8 family, enum nft_chain_types type) 683 { 684 if (family >= NFPROTO_NUMPROTO || 685 type >= NFT_CHAIN_T_MAX) 686 return NULL; 687 688 return chain_type[family][type]; 689 } 690 691 static const struct nft_chain_type * 692 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family) 693 { 694 const struct nft_chain_type *type; 695 int i; 696 697 for (i = 0; i < NFT_CHAIN_T_MAX; i++) { 698 type = __nft_chain_type_get(family, i); 699 if (!type) 700 continue; 701 if (!nla_strcmp(nla, type->name)) 702 return type; 703 } 704 return NULL; 705 } 706 707 struct nft_module_request { 708 struct list_head list; 709 char module[MODULE_NAME_LEN]; 710 bool done; 711 }; 712 713 #ifdef CONFIG_MODULES 714 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, 715 ...) 716 { 717 char module_name[MODULE_NAME_LEN]; 718 struct nftables_pernet *nft_net; 719 struct nft_module_request *req; 720 va_list args; 721 int ret; 722 723 va_start(args, fmt); 724 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args); 725 va_end(args); 726 if (ret >= MODULE_NAME_LEN) 727 return 0; 728 729 nft_net = nft_pernet(net); 730 list_for_each_entry(req, &nft_net->module_list, list) { 731 if (!strcmp(req->module, module_name)) { 732 if (req->done) 733 return 0; 734 735 /* A request to load this module already exists. */ 736 return -EAGAIN; 737 } 738 } 739 740 req = kmalloc(sizeof(*req), GFP_KERNEL); 741 if (!req) 742 return -ENOMEM; 743 744 req->done = false; 745 strlcpy(req->module, module_name, MODULE_NAME_LEN); 746 list_add_tail(&req->list, &nft_net->module_list); 747 748 return -EAGAIN; 749 } 750 EXPORT_SYMBOL_GPL(nft_request_module); 751 #endif 752 753 static void lockdep_nfnl_nft_mutex_not_held(void) 754 { 755 #ifdef CONFIG_PROVE_LOCKING 756 if (debug_locks) 757 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES)); 758 #endif 759 } 760 761 static const struct nft_chain_type * 762 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla, 763 u8 family, bool autoload) 764 { 765 const struct nft_chain_type *type; 766 767 type = __nf_tables_chain_type_lookup(nla, family); 768 if (type != NULL) 769 return type; 770 771 lockdep_nfnl_nft_mutex_not_held(); 772 #ifdef CONFIG_MODULES 773 if (autoload) { 774 if (nft_request_module(net, "nft-chain-%u-%.*s", family, 775 nla_len(nla), 776 (const char *)nla_data(nla)) == -EAGAIN) 777 return ERR_PTR(-EAGAIN); 778 } 779 #endif 780 return ERR_PTR(-ENOENT); 781 } 782 783 static __be16 nft_base_seq(const struct net *net) 784 { 785 struct nftables_pernet *nft_net = nft_pernet(net); 786 787 return htons(nft_net->base_seq & 0xffff); 788 } 789 790 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = { 791 [NFTA_TABLE_NAME] = { .type = NLA_STRING, 792 .len = NFT_TABLE_MAXNAMELEN - 1 }, 793 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 }, 794 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 }, 795 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY, 796 .len = NFT_USERDATA_MAXLEN } 797 }; 798 799 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net, 800 u32 portid, u32 seq, int event, u32 flags, 801 int family, const struct nft_table *table) 802 { 803 struct nlmsghdr *nlh; 804 805 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 806 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 807 NFNETLINK_V0, nft_base_seq(net)); 808 if (!nlh) 809 goto nla_put_failure; 810 811 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) || 812 nla_put_be32(skb, NFTA_TABLE_FLAGS, 813 htonl(table->flags & NFT_TABLE_F_MASK)) || 814 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) || 815 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle), 816 NFTA_TABLE_PAD)) 817 goto nla_put_failure; 818 if (nft_table_has_owner(table) && 819 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid))) 820 goto nla_put_failure; 821 822 if (table->udata) { 823 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata)) 824 goto nla_put_failure; 825 } 826 827 nlmsg_end(skb, nlh); 828 return 0; 829 830 nla_put_failure: 831 nlmsg_trim(skb, nlh); 832 return -1; 833 } 834 835 struct nftnl_skb_parms { 836 bool report; 837 }; 838 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb)) 839 840 static void nft_notify_enqueue(struct sk_buff *skb, bool report, 841 struct list_head *notify_list) 842 { 843 NFT_CB(skb).report = report; 844 list_add_tail(&skb->list, notify_list); 845 } 846 847 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event) 848 { 849 struct nftables_pernet *nft_net; 850 struct sk_buff *skb; 851 u16 flags = 0; 852 int err; 853 854 if (!ctx->report && 855 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 856 return; 857 858 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 859 if (skb == NULL) 860 goto err; 861 862 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 863 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 864 865 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq, 866 event, flags, ctx->family, ctx->table); 867 if (err < 0) { 868 kfree_skb(skb); 869 goto err; 870 } 871 872 nft_net = nft_pernet(ctx->net); 873 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 874 return; 875 err: 876 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 877 } 878 879 static int nf_tables_dump_tables(struct sk_buff *skb, 880 struct netlink_callback *cb) 881 { 882 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 883 struct nftables_pernet *nft_net; 884 const struct nft_table *table; 885 unsigned int idx = 0, s_idx = cb->args[0]; 886 struct net *net = sock_net(skb->sk); 887 int family = nfmsg->nfgen_family; 888 889 rcu_read_lock(); 890 nft_net = nft_pernet(net); 891 cb->seq = nft_net->base_seq; 892 893 list_for_each_entry_rcu(table, &nft_net->tables, list) { 894 if (family != NFPROTO_UNSPEC && family != table->family) 895 continue; 896 897 if (idx < s_idx) 898 goto cont; 899 if (idx > s_idx) 900 memset(&cb->args[1], 0, 901 sizeof(cb->args) - sizeof(cb->args[0])); 902 if (!nft_is_active(net, table)) 903 continue; 904 if (nf_tables_fill_table_info(skb, net, 905 NETLINK_CB(cb->skb).portid, 906 cb->nlh->nlmsg_seq, 907 NFT_MSG_NEWTABLE, NLM_F_MULTI, 908 table->family, table) < 0) 909 goto done; 910 911 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 912 cont: 913 idx++; 914 } 915 done: 916 rcu_read_unlock(); 917 cb->args[0] = idx; 918 return skb->len; 919 } 920 921 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb, 922 const struct nlmsghdr *nlh, 923 struct netlink_dump_control *c) 924 { 925 int err; 926 927 if (!try_module_get(THIS_MODULE)) 928 return -EINVAL; 929 930 rcu_read_unlock(); 931 err = netlink_dump_start(nlsk, skb, nlh, c); 932 rcu_read_lock(); 933 module_put(THIS_MODULE); 934 935 return err; 936 } 937 938 /* called with rcu_read_lock held */ 939 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info, 940 const struct nlattr * const nla[]) 941 { 942 struct netlink_ext_ack *extack = info->extack; 943 u8 genmask = nft_genmask_cur(info->net); 944 u8 family = info->nfmsg->nfgen_family; 945 const struct nft_table *table; 946 struct net *net = info->net; 947 struct sk_buff *skb2; 948 int err; 949 950 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 951 struct netlink_dump_control c = { 952 .dump = nf_tables_dump_tables, 953 .module = THIS_MODULE, 954 }; 955 956 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 957 } 958 959 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0); 960 if (IS_ERR(table)) { 961 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]); 962 return PTR_ERR(table); 963 } 964 965 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 966 if (!skb2) 967 return -ENOMEM; 968 969 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid, 970 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 971 0, family, table); 972 if (err < 0) 973 goto err_fill_table_info; 974 975 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 976 977 err_fill_table_info: 978 kfree_skb(skb2); 979 return err; 980 } 981 982 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt) 983 { 984 struct nft_chain *chain; 985 u32 i = 0; 986 987 list_for_each_entry(chain, &table->chains, list) { 988 if (!nft_is_active_next(net, chain)) 989 continue; 990 if (!nft_is_base_chain(chain)) 991 continue; 992 993 if (cnt && i++ == cnt) 994 break; 995 996 nf_tables_unregister_hook(net, table, chain); 997 } 998 } 999 1000 static int nf_tables_table_enable(struct net *net, struct nft_table *table) 1001 { 1002 struct nft_chain *chain; 1003 int err, i = 0; 1004 1005 list_for_each_entry(chain, &table->chains, list) { 1006 if (!nft_is_active_next(net, chain)) 1007 continue; 1008 if (!nft_is_base_chain(chain)) 1009 continue; 1010 1011 err = nf_tables_register_hook(net, table, chain); 1012 if (err < 0) 1013 goto err_register_hooks; 1014 1015 i++; 1016 } 1017 return 0; 1018 1019 err_register_hooks: 1020 if (i) 1021 nft_table_disable(net, table, i); 1022 return err; 1023 } 1024 1025 static void nf_tables_table_disable(struct net *net, struct nft_table *table) 1026 { 1027 table->flags &= ~NFT_TABLE_F_DORMANT; 1028 nft_table_disable(net, table, 0); 1029 table->flags |= NFT_TABLE_F_DORMANT; 1030 } 1031 1032 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1) 1033 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0) 1034 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1) 1035 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \ 1036 __NFT_TABLE_F_WAS_AWAKEN) 1037 1038 static int nf_tables_updtable(struct nft_ctx *ctx) 1039 { 1040 struct nft_trans *trans; 1041 u32 flags; 1042 int ret; 1043 1044 if (!ctx->nla[NFTA_TABLE_FLAGS]) 1045 return 0; 1046 1047 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS])); 1048 if (flags & ~NFT_TABLE_F_MASK) 1049 return -EOPNOTSUPP; 1050 1051 if (flags == ctx->table->flags) 1052 return 0; 1053 1054 if ((nft_table_has_owner(ctx->table) && 1055 !(flags & NFT_TABLE_F_OWNER)) || 1056 (!nft_table_has_owner(ctx->table) && 1057 flags & NFT_TABLE_F_OWNER)) 1058 return -EOPNOTSUPP; 1059 1060 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE, 1061 sizeof(struct nft_trans_table)); 1062 if (trans == NULL) 1063 return -ENOMEM; 1064 1065 if ((flags & NFT_TABLE_F_DORMANT) && 1066 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) { 1067 ctx->table->flags |= NFT_TABLE_F_DORMANT; 1068 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) 1069 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN; 1070 } else if (!(flags & NFT_TABLE_F_DORMANT) && 1071 ctx->table->flags & NFT_TABLE_F_DORMANT) { 1072 ctx->table->flags &= ~NFT_TABLE_F_DORMANT; 1073 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) { 1074 ret = nf_tables_table_enable(ctx->net, ctx->table); 1075 if (ret < 0) 1076 goto err_register_hooks; 1077 1078 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT; 1079 } 1080 } 1081 1082 nft_trans_table_update(trans) = true; 1083 nft_trans_commit_list_add_tail(ctx->net, trans); 1084 1085 return 0; 1086 1087 err_register_hooks: 1088 nft_trans_destroy(trans); 1089 return ret; 1090 } 1091 1092 static u32 nft_chain_hash(const void *data, u32 len, u32 seed) 1093 { 1094 const char *name = data; 1095 1096 return jhash(name, strlen(name), seed); 1097 } 1098 1099 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed) 1100 { 1101 const struct nft_chain *chain = data; 1102 1103 return nft_chain_hash(chain->name, 0, seed); 1104 } 1105 1106 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg, 1107 const void *ptr) 1108 { 1109 const struct nft_chain *chain = ptr; 1110 const char *name = arg->key; 1111 1112 return strcmp(chain->name, name); 1113 } 1114 1115 static u32 nft_objname_hash(const void *data, u32 len, u32 seed) 1116 { 1117 const struct nft_object_hash_key *k = data; 1118 1119 seed ^= hash_ptr(k->table, 32); 1120 1121 return jhash(k->name, strlen(k->name), seed); 1122 } 1123 1124 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed) 1125 { 1126 const struct nft_object *obj = data; 1127 1128 return nft_objname_hash(&obj->key, 0, seed); 1129 } 1130 1131 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg, 1132 const void *ptr) 1133 { 1134 const struct nft_object_hash_key *k = arg->key; 1135 const struct nft_object *obj = ptr; 1136 1137 if (obj->key.table != k->table) 1138 return -1; 1139 1140 return strcmp(obj->key.name, k->name); 1141 } 1142 1143 static bool nft_supported_family(u8 family) 1144 { 1145 return false 1146 #ifdef CONFIG_NF_TABLES_INET 1147 || family == NFPROTO_INET 1148 #endif 1149 #ifdef CONFIG_NF_TABLES_IPV4 1150 || family == NFPROTO_IPV4 1151 #endif 1152 #ifdef CONFIG_NF_TABLES_ARP 1153 || family == NFPROTO_ARP 1154 #endif 1155 #ifdef CONFIG_NF_TABLES_NETDEV 1156 || family == NFPROTO_NETDEV 1157 #endif 1158 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) 1159 || family == NFPROTO_BRIDGE 1160 #endif 1161 #ifdef CONFIG_NF_TABLES_IPV6 1162 || family == NFPROTO_IPV6 1163 #endif 1164 ; 1165 } 1166 1167 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info, 1168 const struct nlattr * const nla[]) 1169 { 1170 struct nftables_pernet *nft_net = nft_pernet(info->net); 1171 struct netlink_ext_ack *extack = info->extack; 1172 u8 genmask = nft_genmask_next(info->net); 1173 u8 family = info->nfmsg->nfgen_family; 1174 struct net *net = info->net; 1175 const struct nlattr *attr; 1176 struct nft_table *table; 1177 struct nft_ctx ctx; 1178 u32 flags = 0; 1179 int err; 1180 1181 if (!nft_supported_family(family)) 1182 return -EOPNOTSUPP; 1183 1184 lockdep_assert_held(&nft_net->commit_mutex); 1185 attr = nla[NFTA_TABLE_NAME]; 1186 table = nft_table_lookup(net, attr, family, genmask, 1187 NETLINK_CB(skb).portid); 1188 if (IS_ERR(table)) { 1189 if (PTR_ERR(table) != -ENOENT) 1190 return PTR_ERR(table); 1191 } else { 1192 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 1193 NL_SET_BAD_ATTR(extack, attr); 1194 return -EEXIST; 1195 } 1196 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 1197 return -EOPNOTSUPP; 1198 1199 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 1200 1201 return nf_tables_updtable(&ctx); 1202 } 1203 1204 if (nla[NFTA_TABLE_FLAGS]) { 1205 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS])); 1206 if (flags & ~NFT_TABLE_F_MASK) 1207 return -EOPNOTSUPP; 1208 } 1209 1210 err = -ENOMEM; 1211 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT); 1212 if (table == NULL) 1213 goto err_kzalloc; 1214 1215 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT); 1216 if (table->name == NULL) 1217 goto err_strdup; 1218 1219 if (nla[NFTA_TABLE_USERDATA]) { 1220 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT); 1221 if (table->udata == NULL) 1222 goto err_table_udata; 1223 1224 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]); 1225 } 1226 1227 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params); 1228 if (err) 1229 goto err_chain_ht; 1230 1231 INIT_LIST_HEAD(&table->chains); 1232 INIT_LIST_HEAD(&table->sets); 1233 INIT_LIST_HEAD(&table->objects); 1234 INIT_LIST_HEAD(&table->flowtables); 1235 table->family = family; 1236 table->flags = flags; 1237 table->handle = ++table_handle; 1238 if (table->flags & NFT_TABLE_F_OWNER) 1239 table->nlpid = NETLINK_CB(skb).portid; 1240 1241 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 1242 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE); 1243 if (err < 0) 1244 goto err_trans; 1245 1246 list_add_tail_rcu(&table->list, &nft_net->tables); 1247 return 0; 1248 err_trans: 1249 rhltable_destroy(&table->chains_ht); 1250 err_chain_ht: 1251 kfree(table->udata); 1252 err_table_udata: 1253 kfree(table->name); 1254 err_strdup: 1255 kfree(table); 1256 err_kzalloc: 1257 return err; 1258 } 1259 1260 static int nft_flush_table(struct nft_ctx *ctx) 1261 { 1262 struct nft_flowtable *flowtable, *nft; 1263 struct nft_chain *chain, *nc; 1264 struct nft_object *obj, *ne; 1265 struct nft_set *set, *ns; 1266 int err; 1267 1268 list_for_each_entry(chain, &ctx->table->chains, list) { 1269 if (!nft_is_active_next(ctx->net, chain)) 1270 continue; 1271 1272 if (nft_chain_is_bound(chain)) 1273 continue; 1274 1275 ctx->chain = chain; 1276 1277 err = nft_delrule_by_chain(ctx); 1278 if (err < 0) 1279 goto out; 1280 } 1281 1282 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) { 1283 if (!nft_is_active_next(ctx->net, set)) 1284 continue; 1285 1286 if (nft_set_is_anonymous(set) && 1287 !list_empty(&set->bindings)) 1288 continue; 1289 1290 err = nft_delset(ctx, set); 1291 if (err < 0) 1292 goto out; 1293 } 1294 1295 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) { 1296 if (!nft_is_active_next(ctx->net, flowtable)) 1297 continue; 1298 1299 err = nft_delflowtable(ctx, flowtable); 1300 if (err < 0) 1301 goto out; 1302 } 1303 1304 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) { 1305 if (!nft_is_active_next(ctx->net, obj)) 1306 continue; 1307 1308 err = nft_delobj(ctx, obj); 1309 if (err < 0) 1310 goto out; 1311 } 1312 1313 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) { 1314 if (!nft_is_active_next(ctx->net, chain)) 1315 continue; 1316 1317 if (nft_chain_is_bound(chain)) 1318 continue; 1319 1320 ctx->chain = chain; 1321 1322 err = nft_delchain(ctx); 1323 if (err < 0) 1324 goto out; 1325 } 1326 1327 err = nft_deltable(ctx); 1328 out: 1329 return err; 1330 } 1331 1332 static int nft_flush(struct nft_ctx *ctx, int family) 1333 { 1334 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 1335 const struct nlattr * const *nla = ctx->nla; 1336 struct nft_table *table, *nt; 1337 int err = 0; 1338 1339 list_for_each_entry_safe(table, nt, &nft_net->tables, list) { 1340 if (family != AF_UNSPEC && table->family != family) 1341 continue; 1342 1343 ctx->family = table->family; 1344 1345 if (!nft_is_active_next(ctx->net, table)) 1346 continue; 1347 1348 if (nft_table_has_owner(table) && table->nlpid != ctx->portid) 1349 continue; 1350 1351 if (nla[NFTA_TABLE_NAME] && 1352 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0) 1353 continue; 1354 1355 ctx->table = table; 1356 1357 err = nft_flush_table(ctx); 1358 if (err < 0) 1359 goto out; 1360 } 1361 out: 1362 return err; 1363 } 1364 1365 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info, 1366 const struct nlattr * const nla[]) 1367 { 1368 struct netlink_ext_ack *extack = info->extack; 1369 u8 genmask = nft_genmask_next(info->net); 1370 u8 family = info->nfmsg->nfgen_family; 1371 struct net *net = info->net; 1372 const struct nlattr *attr; 1373 struct nft_table *table; 1374 struct nft_ctx ctx; 1375 1376 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla); 1377 if (family == AF_UNSPEC || 1378 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE])) 1379 return nft_flush(&ctx, family); 1380 1381 if (nla[NFTA_TABLE_HANDLE]) { 1382 attr = nla[NFTA_TABLE_HANDLE]; 1383 table = nft_table_lookup_byhandle(net, attr, genmask, 1384 NETLINK_CB(skb).portid); 1385 } else { 1386 attr = nla[NFTA_TABLE_NAME]; 1387 table = nft_table_lookup(net, attr, family, genmask, 1388 NETLINK_CB(skb).portid); 1389 } 1390 1391 if (IS_ERR(table)) { 1392 NL_SET_BAD_ATTR(extack, attr); 1393 return PTR_ERR(table); 1394 } 1395 1396 if (info->nlh->nlmsg_flags & NLM_F_NONREC && 1397 table->use > 0) 1398 return -EBUSY; 1399 1400 ctx.family = family; 1401 ctx.table = table; 1402 1403 return nft_flush_table(&ctx); 1404 } 1405 1406 static void nf_tables_table_destroy(struct nft_ctx *ctx) 1407 { 1408 if (WARN_ON(ctx->table->use > 0)) 1409 return; 1410 1411 rhltable_destroy(&ctx->table->chains_ht); 1412 kfree(ctx->table->name); 1413 kfree(ctx->table->udata); 1414 kfree(ctx->table); 1415 } 1416 1417 void nft_register_chain_type(const struct nft_chain_type *ctype) 1418 { 1419 nfnl_lock(NFNL_SUBSYS_NFTABLES); 1420 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) { 1421 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 1422 return; 1423 } 1424 chain_type[ctype->family][ctype->type] = ctype; 1425 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 1426 } 1427 EXPORT_SYMBOL_GPL(nft_register_chain_type); 1428 1429 void nft_unregister_chain_type(const struct nft_chain_type *ctype) 1430 { 1431 nfnl_lock(NFNL_SUBSYS_NFTABLES); 1432 chain_type[ctype->family][ctype->type] = NULL; 1433 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 1434 } 1435 EXPORT_SYMBOL_GPL(nft_unregister_chain_type); 1436 1437 /* 1438 * Chains 1439 */ 1440 1441 static struct nft_chain * 1442 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask) 1443 { 1444 struct nft_chain *chain; 1445 1446 list_for_each_entry(chain, &table->chains, list) { 1447 if (chain->handle == handle && 1448 nft_active_genmask(chain, genmask)) 1449 return chain; 1450 } 1451 1452 return ERR_PTR(-ENOENT); 1453 } 1454 1455 static bool lockdep_commit_lock_is_held(const struct net *net) 1456 { 1457 #ifdef CONFIG_PROVE_LOCKING 1458 struct nftables_pernet *nft_net = nft_pernet(net); 1459 1460 return lockdep_is_held(&nft_net->commit_mutex); 1461 #else 1462 return true; 1463 #endif 1464 } 1465 1466 static struct nft_chain *nft_chain_lookup(struct net *net, 1467 struct nft_table *table, 1468 const struct nlattr *nla, u8 genmask) 1469 { 1470 char search[NFT_CHAIN_MAXNAMELEN + 1]; 1471 struct rhlist_head *tmp, *list; 1472 struct nft_chain *chain; 1473 1474 if (nla == NULL) 1475 return ERR_PTR(-EINVAL); 1476 1477 nla_strscpy(search, nla, sizeof(search)); 1478 1479 WARN_ON(!rcu_read_lock_held() && 1480 !lockdep_commit_lock_is_held(net)); 1481 1482 chain = ERR_PTR(-ENOENT); 1483 rcu_read_lock(); 1484 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params); 1485 if (!list) 1486 goto out_unlock; 1487 1488 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { 1489 if (nft_active_genmask(chain, genmask)) 1490 goto out_unlock; 1491 } 1492 chain = ERR_PTR(-ENOENT); 1493 out_unlock: 1494 rcu_read_unlock(); 1495 return chain; 1496 } 1497 1498 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = { 1499 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING, 1500 .len = NFT_TABLE_MAXNAMELEN - 1 }, 1501 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 }, 1502 [NFTA_CHAIN_NAME] = { .type = NLA_STRING, 1503 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 1504 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED }, 1505 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 }, 1506 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING, 1507 .len = NFT_MODULE_AUTOLOAD_LIMIT }, 1508 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED }, 1509 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 }, 1510 [NFTA_CHAIN_ID] = { .type = NLA_U32 }, 1511 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY, 1512 .len = NFT_USERDATA_MAXLEN }, 1513 }; 1514 1515 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = { 1516 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 }, 1517 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 }, 1518 [NFTA_HOOK_DEV] = { .type = NLA_STRING, 1519 .len = IFNAMSIZ - 1 }, 1520 }; 1521 1522 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats) 1523 { 1524 struct nft_stats *cpu_stats, total; 1525 struct nlattr *nest; 1526 unsigned int seq; 1527 u64 pkts, bytes; 1528 int cpu; 1529 1530 if (!stats) 1531 return 0; 1532 1533 memset(&total, 0, sizeof(total)); 1534 for_each_possible_cpu(cpu) { 1535 cpu_stats = per_cpu_ptr(stats, cpu); 1536 do { 1537 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp); 1538 pkts = cpu_stats->pkts; 1539 bytes = cpu_stats->bytes; 1540 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq)); 1541 total.pkts += pkts; 1542 total.bytes += bytes; 1543 } 1544 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS); 1545 if (nest == NULL) 1546 goto nla_put_failure; 1547 1548 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts), 1549 NFTA_COUNTER_PAD) || 1550 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes), 1551 NFTA_COUNTER_PAD)) 1552 goto nla_put_failure; 1553 1554 nla_nest_end(skb, nest); 1555 return 0; 1556 1557 nla_put_failure: 1558 return -ENOSPC; 1559 } 1560 1561 static int nft_dump_basechain_hook(struct sk_buff *skb, int family, 1562 const struct nft_base_chain *basechain) 1563 { 1564 const struct nf_hook_ops *ops = &basechain->ops; 1565 struct nft_hook *hook, *first = NULL; 1566 struct nlattr *nest, *nest_devs; 1567 int n = 0; 1568 1569 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK); 1570 if (nest == NULL) 1571 goto nla_put_failure; 1572 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum))) 1573 goto nla_put_failure; 1574 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority))) 1575 goto nla_put_failure; 1576 1577 if (nft_base_chain_netdev(family, ops->hooknum)) { 1578 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS); 1579 list_for_each_entry(hook, &basechain->hook_list, list) { 1580 if (!first) 1581 first = hook; 1582 1583 if (nla_put_string(skb, NFTA_DEVICE_NAME, 1584 hook->ops.dev->name)) 1585 goto nla_put_failure; 1586 n++; 1587 } 1588 nla_nest_end(skb, nest_devs); 1589 1590 if (n == 1 && 1591 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name)) 1592 goto nla_put_failure; 1593 } 1594 nla_nest_end(skb, nest); 1595 1596 return 0; 1597 nla_put_failure: 1598 return -1; 1599 } 1600 1601 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net, 1602 u32 portid, u32 seq, int event, u32 flags, 1603 int family, const struct nft_table *table, 1604 const struct nft_chain *chain) 1605 { 1606 struct nlmsghdr *nlh; 1607 1608 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 1609 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 1610 NFNETLINK_V0, nft_base_seq(net)); 1611 if (!nlh) 1612 goto nla_put_failure; 1613 1614 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name)) 1615 goto nla_put_failure; 1616 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle), 1617 NFTA_CHAIN_PAD)) 1618 goto nla_put_failure; 1619 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name)) 1620 goto nla_put_failure; 1621 1622 if (nft_is_base_chain(chain)) { 1623 const struct nft_base_chain *basechain = nft_base_chain(chain); 1624 struct nft_stats __percpu *stats; 1625 1626 if (nft_dump_basechain_hook(skb, family, basechain)) 1627 goto nla_put_failure; 1628 1629 if (nla_put_be32(skb, NFTA_CHAIN_POLICY, 1630 htonl(basechain->policy))) 1631 goto nla_put_failure; 1632 1633 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name)) 1634 goto nla_put_failure; 1635 1636 stats = rcu_dereference_check(basechain->stats, 1637 lockdep_commit_lock_is_held(net)); 1638 if (nft_dump_stats(skb, stats)) 1639 goto nla_put_failure; 1640 } 1641 1642 if (chain->flags && 1643 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags))) 1644 goto nla_put_failure; 1645 1646 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use))) 1647 goto nla_put_failure; 1648 1649 if (chain->udata && 1650 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata)) 1651 goto nla_put_failure; 1652 1653 nlmsg_end(skb, nlh); 1654 return 0; 1655 1656 nla_put_failure: 1657 nlmsg_trim(skb, nlh); 1658 return -1; 1659 } 1660 1661 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event) 1662 { 1663 struct nftables_pernet *nft_net; 1664 struct sk_buff *skb; 1665 u16 flags = 0; 1666 int err; 1667 1668 if (!ctx->report && 1669 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 1670 return; 1671 1672 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 1673 if (skb == NULL) 1674 goto err; 1675 1676 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 1677 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 1678 1679 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq, 1680 event, flags, ctx->family, ctx->table, 1681 ctx->chain); 1682 if (err < 0) { 1683 kfree_skb(skb); 1684 goto err; 1685 } 1686 1687 nft_net = nft_pernet(ctx->net); 1688 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 1689 return; 1690 err: 1691 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 1692 } 1693 1694 static int nf_tables_dump_chains(struct sk_buff *skb, 1695 struct netlink_callback *cb) 1696 { 1697 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 1698 unsigned int idx = 0, s_idx = cb->args[0]; 1699 struct net *net = sock_net(skb->sk); 1700 int family = nfmsg->nfgen_family; 1701 struct nftables_pernet *nft_net; 1702 const struct nft_table *table; 1703 const struct nft_chain *chain; 1704 1705 rcu_read_lock(); 1706 nft_net = nft_pernet(net); 1707 cb->seq = nft_net->base_seq; 1708 1709 list_for_each_entry_rcu(table, &nft_net->tables, list) { 1710 if (family != NFPROTO_UNSPEC && family != table->family) 1711 continue; 1712 1713 list_for_each_entry_rcu(chain, &table->chains, list) { 1714 if (idx < s_idx) 1715 goto cont; 1716 if (idx > s_idx) 1717 memset(&cb->args[1], 0, 1718 sizeof(cb->args) - sizeof(cb->args[0])); 1719 if (!nft_is_active(net, chain)) 1720 continue; 1721 if (nf_tables_fill_chain_info(skb, net, 1722 NETLINK_CB(cb->skb).portid, 1723 cb->nlh->nlmsg_seq, 1724 NFT_MSG_NEWCHAIN, 1725 NLM_F_MULTI, 1726 table->family, table, 1727 chain) < 0) 1728 goto done; 1729 1730 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 1731 cont: 1732 idx++; 1733 } 1734 } 1735 done: 1736 rcu_read_unlock(); 1737 cb->args[0] = idx; 1738 return skb->len; 1739 } 1740 1741 /* called with rcu_read_lock held */ 1742 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info, 1743 const struct nlattr * const nla[]) 1744 { 1745 struct netlink_ext_ack *extack = info->extack; 1746 u8 genmask = nft_genmask_cur(info->net); 1747 u8 family = info->nfmsg->nfgen_family; 1748 const struct nft_chain *chain; 1749 struct net *net = info->net; 1750 struct nft_table *table; 1751 struct sk_buff *skb2; 1752 int err; 1753 1754 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 1755 struct netlink_dump_control c = { 1756 .dump = nf_tables_dump_chains, 1757 .module = THIS_MODULE, 1758 }; 1759 1760 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 1761 } 1762 1763 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0); 1764 if (IS_ERR(table)) { 1765 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 1766 return PTR_ERR(table); 1767 } 1768 1769 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask); 1770 if (IS_ERR(chain)) { 1771 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 1772 return PTR_ERR(chain); 1773 } 1774 1775 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 1776 if (!skb2) 1777 return -ENOMEM; 1778 1779 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid, 1780 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 1781 0, family, table, chain); 1782 if (err < 0) 1783 goto err_fill_chain_info; 1784 1785 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 1786 1787 err_fill_chain_info: 1788 kfree_skb(skb2); 1789 return err; 1790 } 1791 1792 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = { 1793 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 }, 1794 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 }, 1795 }; 1796 1797 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr) 1798 { 1799 struct nlattr *tb[NFTA_COUNTER_MAX+1]; 1800 struct nft_stats __percpu *newstats; 1801 struct nft_stats *stats; 1802 int err; 1803 1804 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr, 1805 nft_counter_policy, NULL); 1806 if (err < 0) 1807 return ERR_PTR(err); 1808 1809 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS]) 1810 return ERR_PTR(-EINVAL); 1811 1812 newstats = netdev_alloc_pcpu_stats(struct nft_stats); 1813 if (newstats == NULL) 1814 return ERR_PTR(-ENOMEM); 1815 1816 /* Restore old counters on this cpu, no problem. Per-cpu statistics 1817 * are not exposed to userspace. 1818 */ 1819 preempt_disable(); 1820 stats = this_cpu_ptr(newstats); 1821 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES])); 1822 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS])); 1823 preempt_enable(); 1824 1825 return newstats; 1826 } 1827 1828 static void nft_chain_stats_replace(struct nft_trans *trans) 1829 { 1830 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain); 1831 1832 if (!nft_trans_chain_stats(trans)) 1833 return; 1834 1835 nft_trans_chain_stats(trans) = 1836 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans), 1837 lockdep_commit_lock_is_held(trans->ctx.net)); 1838 1839 if (!nft_trans_chain_stats(trans)) 1840 static_branch_inc(&nft_counters_enabled); 1841 } 1842 1843 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain) 1844 { 1845 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0); 1846 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1); 1847 1848 if (g0 != g1) 1849 kvfree(g1); 1850 kvfree(g0); 1851 1852 /* should be NULL either via abort or via successful commit */ 1853 WARN_ON_ONCE(chain->blob_next); 1854 kvfree(chain->blob_next); 1855 } 1856 1857 void nf_tables_chain_destroy(struct nft_ctx *ctx) 1858 { 1859 struct nft_chain *chain = ctx->chain; 1860 struct nft_hook *hook, *next; 1861 1862 if (WARN_ON(chain->use > 0)) 1863 return; 1864 1865 /* no concurrent access possible anymore */ 1866 nf_tables_chain_free_chain_rules(chain); 1867 1868 if (nft_is_base_chain(chain)) { 1869 struct nft_base_chain *basechain = nft_base_chain(chain); 1870 1871 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) { 1872 list_for_each_entry_safe(hook, next, 1873 &basechain->hook_list, list) { 1874 list_del_rcu(&hook->list); 1875 kfree_rcu(hook, rcu); 1876 } 1877 } 1878 module_put(basechain->type->owner); 1879 if (rcu_access_pointer(basechain->stats)) { 1880 static_branch_dec(&nft_counters_enabled); 1881 free_percpu(rcu_dereference_raw(basechain->stats)); 1882 } 1883 kfree(chain->name); 1884 kfree(chain->udata); 1885 kfree(basechain); 1886 } else { 1887 kfree(chain->name); 1888 kfree(chain->udata); 1889 kfree(chain); 1890 } 1891 } 1892 1893 static struct nft_hook *nft_netdev_hook_alloc(struct net *net, 1894 const struct nlattr *attr) 1895 { 1896 struct net_device *dev; 1897 char ifname[IFNAMSIZ]; 1898 struct nft_hook *hook; 1899 int err; 1900 1901 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT); 1902 if (!hook) { 1903 err = -ENOMEM; 1904 goto err_hook_alloc; 1905 } 1906 1907 nla_strscpy(ifname, attr, IFNAMSIZ); 1908 /* nf_tables_netdev_event() is called under rtnl_mutex, this is 1909 * indirectly serializing all the other holders of the commit_mutex with 1910 * the rtnl_mutex. 1911 */ 1912 dev = __dev_get_by_name(net, ifname); 1913 if (!dev) { 1914 err = -ENOENT; 1915 goto err_hook_dev; 1916 } 1917 hook->ops.dev = dev; 1918 1919 return hook; 1920 1921 err_hook_dev: 1922 kfree(hook); 1923 err_hook_alloc: 1924 return ERR_PTR(err); 1925 } 1926 1927 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list, 1928 const struct nft_hook *this) 1929 { 1930 struct nft_hook *hook; 1931 1932 list_for_each_entry(hook, hook_list, list) { 1933 if (this->ops.dev == hook->ops.dev) 1934 return hook; 1935 } 1936 1937 return NULL; 1938 } 1939 1940 static int nf_tables_parse_netdev_hooks(struct net *net, 1941 const struct nlattr *attr, 1942 struct list_head *hook_list) 1943 { 1944 struct nft_hook *hook, *next; 1945 const struct nlattr *tmp; 1946 int rem, n = 0, err; 1947 1948 nla_for_each_nested(tmp, attr, rem) { 1949 if (nla_type(tmp) != NFTA_DEVICE_NAME) { 1950 err = -EINVAL; 1951 goto err_hook; 1952 } 1953 1954 hook = nft_netdev_hook_alloc(net, tmp); 1955 if (IS_ERR(hook)) { 1956 err = PTR_ERR(hook); 1957 goto err_hook; 1958 } 1959 if (nft_hook_list_find(hook_list, hook)) { 1960 kfree(hook); 1961 err = -EEXIST; 1962 goto err_hook; 1963 } 1964 list_add_tail(&hook->list, hook_list); 1965 n++; 1966 1967 if (n == NFT_NETDEVICE_MAX) { 1968 err = -EFBIG; 1969 goto err_hook; 1970 } 1971 } 1972 1973 return 0; 1974 1975 err_hook: 1976 list_for_each_entry_safe(hook, next, hook_list, list) { 1977 list_del(&hook->list); 1978 kfree(hook); 1979 } 1980 return err; 1981 } 1982 1983 struct nft_chain_hook { 1984 u32 num; 1985 s32 priority; 1986 const struct nft_chain_type *type; 1987 struct list_head list; 1988 }; 1989 1990 static int nft_chain_parse_netdev(struct net *net, 1991 struct nlattr *tb[], 1992 struct list_head *hook_list) 1993 { 1994 struct nft_hook *hook; 1995 int err; 1996 1997 if (tb[NFTA_HOOK_DEV]) { 1998 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]); 1999 if (IS_ERR(hook)) 2000 return PTR_ERR(hook); 2001 2002 list_add_tail(&hook->list, hook_list); 2003 } else if (tb[NFTA_HOOK_DEVS]) { 2004 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS], 2005 hook_list); 2006 if (err < 0) 2007 return err; 2008 2009 if (list_empty(hook_list)) 2010 return -EINVAL; 2011 } else { 2012 return -EINVAL; 2013 } 2014 2015 return 0; 2016 } 2017 2018 static int nft_chain_parse_hook(struct net *net, 2019 const struct nlattr * const nla[], 2020 struct nft_chain_hook *hook, u8 family, 2021 struct netlink_ext_ack *extack, bool autoload) 2022 { 2023 struct nftables_pernet *nft_net = nft_pernet(net); 2024 struct nlattr *ha[NFTA_HOOK_MAX + 1]; 2025 const struct nft_chain_type *type; 2026 int err; 2027 2028 lockdep_assert_held(&nft_net->commit_mutex); 2029 lockdep_nfnl_nft_mutex_not_held(); 2030 2031 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX, 2032 nla[NFTA_CHAIN_HOOK], 2033 nft_hook_policy, NULL); 2034 if (err < 0) 2035 return err; 2036 2037 if (ha[NFTA_HOOK_HOOKNUM] == NULL || 2038 ha[NFTA_HOOK_PRIORITY] == NULL) 2039 return -EINVAL; 2040 2041 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM])); 2042 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY])); 2043 2044 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT); 2045 if (!type) 2046 return -EOPNOTSUPP; 2047 2048 if (nla[NFTA_CHAIN_TYPE]) { 2049 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE], 2050 family, autoload); 2051 if (IS_ERR(type)) { 2052 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]); 2053 return PTR_ERR(type); 2054 } 2055 } 2056 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num))) 2057 return -EOPNOTSUPP; 2058 2059 if (type->type == NFT_CHAIN_T_NAT && 2060 hook->priority <= NF_IP_PRI_CONNTRACK) 2061 return -EOPNOTSUPP; 2062 2063 if (!try_module_get(type->owner)) { 2064 if (nla[NFTA_CHAIN_TYPE]) 2065 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]); 2066 return -ENOENT; 2067 } 2068 2069 hook->type = type; 2070 2071 INIT_LIST_HEAD(&hook->list); 2072 if (nft_base_chain_netdev(family, hook->num)) { 2073 err = nft_chain_parse_netdev(net, ha, &hook->list); 2074 if (err < 0) { 2075 module_put(type->owner); 2076 return err; 2077 } 2078 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) { 2079 module_put(type->owner); 2080 return -EOPNOTSUPP; 2081 } 2082 2083 return 0; 2084 } 2085 2086 static void nft_chain_release_hook(struct nft_chain_hook *hook) 2087 { 2088 struct nft_hook *h, *next; 2089 2090 list_for_each_entry_safe(h, next, &hook->list, list) { 2091 list_del(&h->list); 2092 kfree(h); 2093 } 2094 module_put(hook->type->owner); 2095 } 2096 2097 struct nft_rules_old { 2098 struct rcu_head h; 2099 struct nft_rule_blob *blob; 2100 }; 2101 2102 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr) 2103 { 2104 struct nft_rule_dp *prule; 2105 2106 prule = (struct nft_rule_dp *)ptr; 2107 prule->is_last = 1; 2108 /* blob size does not include the trailer rule */ 2109 } 2110 2111 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size) 2112 { 2113 struct nft_rule_blob *blob; 2114 2115 /* size must include room for the last rule */ 2116 if (size < offsetof(struct nft_rule_dp, data)) 2117 return NULL; 2118 2119 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old); 2120 if (size > INT_MAX) 2121 return NULL; 2122 2123 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT); 2124 if (!blob) 2125 return NULL; 2126 2127 blob->size = 0; 2128 nft_last_rule(blob, blob->data); 2129 2130 return blob; 2131 } 2132 2133 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family, 2134 const struct nft_chain_hook *hook, 2135 struct nft_chain *chain) 2136 { 2137 ops->pf = family; 2138 ops->hooknum = hook->num; 2139 ops->priority = hook->priority; 2140 ops->priv = chain; 2141 ops->hook = hook->type->hooks[ops->hooknum]; 2142 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES; 2143 } 2144 2145 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family, 2146 struct nft_chain_hook *hook, u32 flags) 2147 { 2148 struct nft_chain *chain; 2149 struct nft_hook *h; 2150 2151 basechain->type = hook->type; 2152 INIT_LIST_HEAD(&basechain->hook_list); 2153 chain = &basechain->chain; 2154 2155 if (nft_base_chain_netdev(family, hook->num)) { 2156 list_splice_init(&hook->list, &basechain->hook_list); 2157 list_for_each_entry(h, &basechain->hook_list, list) 2158 nft_basechain_hook_init(&h->ops, family, hook, chain); 2159 2160 basechain->ops.hooknum = hook->num; 2161 basechain->ops.priority = hook->priority; 2162 } else { 2163 nft_basechain_hook_init(&basechain->ops, family, hook, chain); 2164 } 2165 2166 chain->flags |= NFT_CHAIN_BASE | flags; 2167 basechain->policy = NF_ACCEPT; 2168 if (chain->flags & NFT_CHAIN_HW_OFFLOAD && 2169 !nft_chain_offload_support(basechain)) 2170 return -EOPNOTSUPP; 2171 2172 flow_block_init(&basechain->flow_block); 2173 2174 return 0; 2175 } 2176 2177 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain) 2178 { 2179 int err; 2180 2181 err = rhltable_insert_key(&table->chains_ht, chain->name, 2182 &chain->rhlhead, nft_chain_ht_params); 2183 if (err) 2184 return err; 2185 2186 list_add_tail_rcu(&chain->list, &table->chains); 2187 2188 return 0; 2189 } 2190 2191 static u64 chain_id; 2192 2193 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, 2194 u8 policy, u32 flags, 2195 struct netlink_ext_ack *extack) 2196 { 2197 const struct nlattr * const *nla = ctx->nla; 2198 struct nft_table *table = ctx->table; 2199 struct nft_base_chain *basechain; 2200 struct nft_stats __percpu *stats; 2201 struct net *net = ctx->net; 2202 char name[NFT_NAME_MAXLEN]; 2203 struct nft_rule_blob *blob; 2204 struct nft_trans *trans; 2205 struct nft_chain *chain; 2206 unsigned int data_size; 2207 int err; 2208 2209 if (table->use == UINT_MAX) 2210 return -EOVERFLOW; 2211 2212 if (nla[NFTA_CHAIN_HOOK]) { 2213 struct nft_chain_hook hook; 2214 2215 if (flags & NFT_CHAIN_BINDING) 2216 return -EOPNOTSUPP; 2217 2218 err = nft_chain_parse_hook(net, nla, &hook, family, extack, 2219 true); 2220 if (err < 0) 2221 return err; 2222 2223 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT); 2224 if (basechain == NULL) { 2225 nft_chain_release_hook(&hook); 2226 return -ENOMEM; 2227 } 2228 chain = &basechain->chain; 2229 2230 if (nla[NFTA_CHAIN_COUNTERS]) { 2231 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); 2232 if (IS_ERR(stats)) { 2233 nft_chain_release_hook(&hook); 2234 kfree(basechain); 2235 return PTR_ERR(stats); 2236 } 2237 rcu_assign_pointer(basechain->stats, stats); 2238 static_branch_inc(&nft_counters_enabled); 2239 } 2240 2241 err = nft_basechain_init(basechain, family, &hook, flags); 2242 if (err < 0) { 2243 nft_chain_release_hook(&hook); 2244 kfree(basechain); 2245 return err; 2246 } 2247 } else { 2248 if (flags & NFT_CHAIN_BASE) 2249 return -EINVAL; 2250 if (flags & NFT_CHAIN_HW_OFFLOAD) 2251 return -EOPNOTSUPP; 2252 2253 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT); 2254 if (chain == NULL) 2255 return -ENOMEM; 2256 2257 chain->flags = flags; 2258 } 2259 ctx->chain = chain; 2260 2261 INIT_LIST_HEAD(&chain->rules); 2262 chain->handle = nf_tables_alloc_handle(table); 2263 chain->table = table; 2264 2265 if (nla[NFTA_CHAIN_NAME]) { 2266 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT); 2267 } else { 2268 if (!(flags & NFT_CHAIN_BINDING)) { 2269 err = -EINVAL; 2270 goto err_destroy_chain; 2271 } 2272 2273 snprintf(name, sizeof(name), "__chain%llu", ++chain_id); 2274 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT); 2275 } 2276 2277 if (!chain->name) { 2278 err = -ENOMEM; 2279 goto err_destroy_chain; 2280 } 2281 2282 if (nla[NFTA_CHAIN_USERDATA]) { 2283 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT); 2284 if (chain->udata == NULL) { 2285 err = -ENOMEM; 2286 goto err_destroy_chain; 2287 } 2288 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]); 2289 } 2290 2291 data_size = offsetof(struct nft_rule_dp, data); /* last rule */ 2292 blob = nf_tables_chain_alloc_rules(data_size); 2293 if (!blob) { 2294 err = -ENOMEM; 2295 goto err_destroy_chain; 2296 } 2297 2298 RCU_INIT_POINTER(chain->blob_gen_0, blob); 2299 RCU_INIT_POINTER(chain->blob_gen_1, blob); 2300 2301 err = nf_tables_register_hook(net, table, chain); 2302 if (err < 0) 2303 goto err_destroy_chain; 2304 2305 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); 2306 if (IS_ERR(trans)) { 2307 err = PTR_ERR(trans); 2308 goto err_unregister_hook; 2309 } 2310 2311 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET; 2312 if (nft_is_base_chain(chain)) 2313 nft_trans_chain_policy(trans) = policy; 2314 2315 err = nft_chain_add(table, chain); 2316 if (err < 0) { 2317 nft_trans_destroy(trans); 2318 goto err_unregister_hook; 2319 } 2320 2321 table->use++; 2322 2323 return 0; 2324 err_unregister_hook: 2325 nf_tables_unregister_hook(net, table, chain); 2326 err_destroy_chain: 2327 nf_tables_chain_destroy(ctx); 2328 2329 return err; 2330 } 2331 2332 static bool nft_hook_list_equal(struct list_head *hook_list1, 2333 struct list_head *hook_list2) 2334 { 2335 struct nft_hook *hook; 2336 int n = 0, m = 0; 2337 2338 n = 0; 2339 list_for_each_entry(hook, hook_list2, list) { 2340 if (!nft_hook_list_find(hook_list1, hook)) 2341 return false; 2342 2343 n++; 2344 } 2345 list_for_each_entry(hook, hook_list1, list) 2346 m++; 2347 2348 return n == m; 2349 } 2350 2351 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, 2352 u32 flags, const struct nlattr *attr, 2353 struct netlink_ext_ack *extack) 2354 { 2355 const struct nlattr * const *nla = ctx->nla; 2356 struct nft_table *table = ctx->table; 2357 struct nft_chain *chain = ctx->chain; 2358 struct nft_base_chain *basechain; 2359 struct nft_stats *stats = NULL; 2360 struct nft_chain_hook hook; 2361 struct nf_hook_ops *ops; 2362 struct nft_trans *trans; 2363 int err; 2364 2365 if (chain->flags ^ flags) 2366 return -EOPNOTSUPP; 2367 2368 if (nla[NFTA_CHAIN_HOOK]) { 2369 if (!nft_is_base_chain(chain)) { 2370 NL_SET_BAD_ATTR(extack, attr); 2371 return -EEXIST; 2372 } 2373 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family, 2374 extack, false); 2375 if (err < 0) 2376 return err; 2377 2378 basechain = nft_base_chain(chain); 2379 if (basechain->type != hook.type) { 2380 nft_chain_release_hook(&hook); 2381 NL_SET_BAD_ATTR(extack, attr); 2382 return -EEXIST; 2383 } 2384 2385 if (nft_base_chain_netdev(ctx->family, hook.num)) { 2386 if (!nft_hook_list_equal(&basechain->hook_list, 2387 &hook.list)) { 2388 nft_chain_release_hook(&hook); 2389 NL_SET_BAD_ATTR(extack, attr); 2390 return -EEXIST; 2391 } 2392 } else { 2393 ops = &basechain->ops; 2394 if (ops->hooknum != hook.num || 2395 ops->priority != hook.priority) { 2396 nft_chain_release_hook(&hook); 2397 NL_SET_BAD_ATTR(extack, attr); 2398 return -EEXIST; 2399 } 2400 } 2401 nft_chain_release_hook(&hook); 2402 } 2403 2404 if (nla[NFTA_CHAIN_HANDLE] && 2405 nla[NFTA_CHAIN_NAME]) { 2406 struct nft_chain *chain2; 2407 2408 chain2 = nft_chain_lookup(ctx->net, table, 2409 nla[NFTA_CHAIN_NAME], genmask); 2410 if (!IS_ERR(chain2)) { 2411 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 2412 return -EEXIST; 2413 } 2414 } 2415 2416 if (nla[NFTA_CHAIN_COUNTERS]) { 2417 if (!nft_is_base_chain(chain)) 2418 return -EOPNOTSUPP; 2419 2420 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); 2421 if (IS_ERR(stats)) 2422 return PTR_ERR(stats); 2423 } 2424 2425 err = -ENOMEM; 2426 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, 2427 sizeof(struct nft_trans_chain)); 2428 if (trans == NULL) 2429 goto err; 2430 2431 nft_trans_chain_stats(trans) = stats; 2432 nft_trans_chain_update(trans) = true; 2433 2434 if (nla[NFTA_CHAIN_POLICY]) 2435 nft_trans_chain_policy(trans) = policy; 2436 else 2437 nft_trans_chain_policy(trans) = -1; 2438 2439 if (nla[NFTA_CHAIN_HANDLE] && 2440 nla[NFTA_CHAIN_NAME]) { 2441 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 2442 struct nft_trans *tmp; 2443 char *name; 2444 2445 err = -ENOMEM; 2446 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT); 2447 if (!name) 2448 goto err; 2449 2450 err = -EEXIST; 2451 list_for_each_entry(tmp, &nft_net->commit_list, list) { 2452 if (tmp->msg_type == NFT_MSG_NEWCHAIN && 2453 tmp->ctx.table == table && 2454 nft_trans_chain_update(tmp) && 2455 nft_trans_chain_name(tmp) && 2456 strcmp(name, nft_trans_chain_name(tmp)) == 0) { 2457 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 2458 kfree(name); 2459 goto err; 2460 } 2461 } 2462 2463 nft_trans_chain_name(trans) = name; 2464 } 2465 nft_trans_commit_list_add_tail(ctx->net, trans); 2466 2467 return 0; 2468 err: 2469 free_percpu(stats); 2470 kfree(trans); 2471 return err; 2472 } 2473 2474 static struct nft_chain *nft_chain_lookup_byid(const struct net *net, 2475 const struct nlattr *nla) 2476 { 2477 struct nftables_pernet *nft_net = nft_pernet(net); 2478 u32 id = ntohl(nla_get_be32(nla)); 2479 struct nft_trans *trans; 2480 2481 list_for_each_entry(trans, &nft_net->commit_list, list) { 2482 struct nft_chain *chain = trans->ctx.chain; 2483 2484 if (trans->msg_type == NFT_MSG_NEWCHAIN && 2485 id == nft_trans_chain_id(trans)) 2486 return chain; 2487 } 2488 return ERR_PTR(-ENOENT); 2489 } 2490 2491 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info, 2492 const struct nlattr * const nla[]) 2493 { 2494 struct nftables_pernet *nft_net = nft_pernet(info->net); 2495 struct netlink_ext_ack *extack = info->extack; 2496 u8 genmask = nft_genmask_next(info->net); 2497 u8 family = info->nfmsg->nfgen_family; 2498 struct nft_chain *chain = NULL; 2499 struct net *net = info->net; 2500 const struct nlattr *attr; 2501 struct nft_table *table; 2502 u8 policy = NF_ACCEPT; 2503 struct nft_ctx ctx; 2504 u64 handle = 0; 2505 u32 flags = 0; 2506 2507 lockdep_assert_held(&nft_net->commit_mutex); 2508 2509 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 2510 NETLINK_CB(skb).portid); 2511 if (IS_ERR(table)) { 2512 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 2513 return PTR_ERR(table); 2514 } 2515 2516 chain = NULL; 2517 attr = nla[NFTA_CHAIN_NAME]; 2518 2519 if (nla[NFTA_CHAIN_HANDLE]) { 2520 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); 2521 chain = nft_chain_lookup_byhandle(table, handle, genmask); 2522 if (IS_ERR(chain)) { 2523 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]); 2524 return PTR_ERR(chain); 2525 } 2526 attr = nla[NFTA_CHAIN_HANDLE]; 2527 } else if (nla[NFTA_CHAIN_NAME]) { 2528 chain = nft_chain_lookup(net, table, attr, genmask); 2529 if (IS_ERR(chain)) { 2530 if (PTR_ERR(chain) != -ENOENT) { 2531 NL_SET_BAD_ATTR(extack, attr); 2532 return PTR_ERR(chain); 2533 } 2534 chain = NULL; 2535 } 2536 } else if (!nla[NFTA_CHAIN_ID]) { 2537 return -EINVAL; 2538 } 2539 2540 if (nla[NFTA_CHAIN_POLICY]) { 2541 if (chain != NULL && 2542 !nft_is_base_chain(chain)) { 2543 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); 2544 return -EOPNOTSUPP; 2545 } 2546 2547 if (chain == NULL && 2548 nla[NFTA_CHAIN_HOOK] == NULL) { 2549 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); 2550 return -EOPNOTSUPP; 2551 } 2552 2553 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); 2554 switch (policy) { 2555 case NF_DROP: 2556 case NF_ACCEPT: 2557 break; 2558 default: 2559 return -EINVAL; 2560 } 2561 } 2562 2563 if (nla[NFTA_CHAIN_FLAGS]) 2564 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS])); 2565 else if (chain) 2566 flags = chain->flags; 2567 2568 if (flags & ~NFT_CHAIN_FLAGS) 2569 return -EOPNOTSUPP; 2570 2571 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 2572 2573 if (chain != NULL) { 2574 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 2575 NL_SET_BAD_ATTR(extack, attr); 2576 return -EEXIST; 2577 } 2578 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 2579 return -EOPNOTSUPP; 2580 2581 flags |= chain->flags & NFT_CHAIN_BASE; 2582 return nf_tables_updchain(&ctx, genmask, policy, flags, attr, 2583 extack); 2584 } 2585 2586 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack); 2587 } 2588 2589 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info, 2590 const struct nlattr * const nla[]) 2591 { 2592 struct netlink_ext_ack *extack = info->extack; 2593 u8 genmask = nft_genmask_next(info->net); 2594 u8 family = info->nfmsg->nfgen_family; 2595 struct net *net = info->net; 2596 const struct nlattr *attr; 2597 struct nft_table *table; 2598 struct nft_chain *chain; 2599 struct nft_rule *rule; 2600 struct nft_ctx ctx; 2601 u64 handle; 2602 u32 use; 2603 int err; 2604 2605 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 2606 NETLINK_CB(skb).portid); 2607 if (IS_ERR(table)) { 2608 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 2609 return PTR_ERR(table); 2610 } 2611 2612 if (nla[NFTA_CHAIN_HANDLE]) { 2613 attr = nla[NFTA_CHAIN_HANDLE]; 2614 handle = be64_to_cpu(nla_get_be64(attr)); 2615 chain = nft_chain_lookup_byhandle(table, handle, genmask); 2616 } else { 2617 attr = nla[NFTA_CHAIN_NAME]; 2618 chain = nft_chain_lookup(net, table, attr, genmask); 2619 } 2620 if (IS_ERR(chain)) { 2621 NL_SET_BAD_ATTR(extack, attr); 2622 return PTR_ERR(chain); 2623 } 2624 2625 if (info->nlh->nlmsg_flags & NLM_F_NONREC && 2626 chain->use > 0) 2627 return -EBUSY; 2628 2629 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 2630 2631 use = chain->use; 2632 list_for_each_entry(rule, &chain->rules, list) { 2633 if (!nft_is_active_next(net, rule)) 2634 continue; 2635 use--; 2636 2637 err = nft_delrule(&ctx, rule); 2638 if (err < 0) 2639 return err; 2640 } 2641 2642 /* There are rules and elements that are still holding references to us, 2643 * we cannot do a recursive removal in this case. 2644 */ 2645 if (use > 0) { 2646 NL_SET_BAD_ATTR(extack, attr); 2647 return -EBUSY; 2648 } 2649 2650 return nft_delchain(&ctx); 2651 } 2652 2653 /* 2654 * Expressions 2655 */ 2656 2657 /** 2658 * nft_register_expr - register nf_tables expr type 2659 * @type: expr type 2660 * 2661 * Registers the expr type for use with nf_tables. Returns zero on 2662 * success or a negative errno code otherwise. 2663 */ 2664 int nft_register_expr(struct nft_expr_type *type) 2665 { 2666 nfnl_lock(NFNL_SUBSYS_NFTABLES); 2667 if (type->family == NFPROTO_UNSPEC) 2668 list_add_tail_rcu(&type->list, &nf_tables_expressions); 2669 else 2670 list_add_rcu(&type->list, &nf_tables_expressions); 2671 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 2672 return 0; 2673 } 2674 EXPORT_SYMBOL_GPL(nft_register_expr); 2675 2676 /** 2677 * nft_unregister_expr - unregister nf_tables expr type 2678 * @type: expr type 2679 * 2680 * Unregisters the expr typefor use with nf_tables. 2681 */ 2682 void nft_unregister_expr(struct nft_expr_type *type) 2683 { 2684 nfnl_lock(NFNL_SUBSYS_NFTABLES); 2685 list_del_rcu(&type->list); 2686 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 2687 } 2688 EXPORT_SYMBOL_GPL(nft_unregister_expr); 2689 2690 static const struct nft_expr_type *__nft_expr_type_get(u8 family, 2691 struct nlattr *nla) 2692 { 2693 const struct nft_expr_type *type, *candidate = NULL; 2694 2695 list_for_each_entry(type, &nf_tables_expressions, list) { 2696 if (!nla_strcmp(nla, type->name)) { 2697 if (!type->family && !candidate) 2698 candidate = type; 2699 else if (type->family == family) 2700 candidate = type; 2701 } 2702 } 2703 return candidate; 2704 } 2705 2706 #ifdef CONFIG_MODULES 2707 static int nft_expr_type_request_module(struct net *net, u8 family, 2708 struct nlattr *nla) 2709 { 2710 if (nft_request_module(net, "nft-expr-%u-%.*s", family, 2711 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN) 2712 return -EAGAIN; 2713 2714 return 0; 2715 } 2716 #endif 2717 2718 static const struct nft_expr_type *nft_expr_type_get(struct net *net, 2719 u8 family, 2720 struct nlattr *nla) 2721 { 2722 const struct nft_expr_type *type; 2723 2724 if (nla == NULL) 2725 return ERR_PTR(-EINVAL); 2726 2727 type = __nft_expr_type_get(family, nla); 2728 if (type != NULL && try_module_get(type->owner)) 2729 return type; 2730 2731 lockdep_nfnl_nft_mutex_not_held(); 2732 #ifdef CONFIG_MODULES 2733 if (type == NULL) { 2734 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN) 2735 return ERR_PTR(-EAGAIN); 2736 2737 if (nft_request_module(net, "nft-expr-%.*s", 2738 nla_len(nla), 2739 (char *)nla_data(nla)) == -EAGAIN) 2740 return ERR_PTR(-EAGAIN); 2741 } 2742 #endif 2743 return ERR_PTR(-ENOENT); 2744 } 2745 2746 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { 2747 [NFTA_EXPR_NAME] = { .type = NLA_STRING, 2748 .len = NFT_MODULE_AUTOLOAD_LIMIT }, 2749 [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, 2750 }; 2751 2752 static int nf_tables_fill_expr_info(struct sk_buff *skb, 2753 const struct nft_expr *expr) 2754 { 2755 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) 2756 goto nla_put_failure; 2757 2758 if (expr->ops->dump) { 2759 struct nlattr *data = nla_nest_start_noflag(skb, 2760 NFTA_EXPR_DATA); 2761 if (data == NULL) 2762 goto nla_put_failure; 2763 if (expr->ops->dump(skb, expr) < 0) 2764 goto nla_put_failure; 2765 nla_nest_end(skb, data); 2766 } 2767 2768 return skb->len; 2769 2770 nla_put_failure: 2771 return -1; 2772 }; 2773 2774 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 2775 const struct nft_expr *expr) 2776 { 2777 struct nlattr *nest; 2778 2779 nest = nla_nest_start_noflag(skb, attr); 2780 if (!nest) 2781 goto nla_put_failure; 2782 if (nf_tables_fill_expr_info(skb, expr) < 0) 2783 goto nla_put_failure; 2784 nla_nest_end(skb, nest); 2785 return 0; 2786 2787 nla_put_failure: 2788 return -1; 2789 } 2790 2791 struct nft_expr_info { 2792 const struct nft_expr_ops *ops; 2793 const struct nlattr *attr; 2794 struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; 2795 }; 2796 2797 static int nf_tables_expr_parse(const struct nft_ctx *ctx, 2798 const struct nlattr *nla, 2799 struct nft_expr_info *info) 2800 { 2801 const struct nft_expr_type *type; 2802 const struct nft_expr_ops *ops; 2803 struct nlattr *tb[NFTA_EXPR_MAX + 1]; 2804 int err; 2805 2806 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla, 2807 nft_expr_policy, NULL); 2808 if (err < 0) 2809 return err; 2810 2811 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]); 2812 if (IS_ERR(type)) 2813 return PTR_ERR(type); 2814 2815 if (tb[NFTA_EXPR_DATA]) { 2816 err = nla_parse_nested_deprecated(info->tb, type->maxattr, 2817 tb[NFTA_EXPR_DATA], 2818 type->policy, NULL); 2819 if (err < 0) 2820 goto err1; 2821 } else 2822 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); 2823 2824 if (type->select_ops != NULL) { 2825 ops = type->select_ops(ctx, 2826 (const struct nlattr * const *)info->tb); 2827 if (IS_ERR(ops)) { 2828 err = PTR_ERR(ops); 2829 #ifdef CONFIG_MODULES 2830 if (err == -EAGAIN) 2831 if (nft_expr_type_request_module(ctx->net, 2832 ctx->family, 2833 tb[NFTA_EXPR_NAME]) != -EAGAIN) 2834 err = -ENOENT; 2835 #endif 2836 goto err1; 2837 } 2838 } else 2839 ops = type->ops; 2840 2841 info->attr = nla; 2842 info->ops = ops; 2843 2844 return 0; 2845 2846 err1: 2847 module_put(type->owner); 2848 return err; 2849 } 2850 2851 static int nf_tables_newexpr(const struct nft_ctx *ctx, 2852 const struct nft_expr_info *expr_info, 2853 struct nft_expr *expr) 2854 { 2855 const struct nft_expr_ops *ops = expr_info->ops; 2856 int err; 2857 2858 expr->ops = ops; 2859 if (ops->init) { 2860 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb); 2861 if (err < 0) 2862 goto err1; 2863 } 2864 2865 return 0; 2866 err1: 2867 expr->ops = NULL; 2868 return err; 2869 } 2870 2871 static void nf_tables_expr_destroy(const struct nft_ctx *ctx, 2872 struct nft_expr *expr) 2873 { 2874 const struct nft_expr_type *type = expr->ops->type; 2875 2876 if (expr->ops->destroy) 2877 expr->ops->destroy(ctx, expr); 2878 module_put(type->owner); 2879 } 2880 2881 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, 2882 const struct nlattr *nla) 2883 { 2884 struct nft_expr_info expr_info; 2885 struct nft_expr *expr; 2886 struct module *owner; 2887 int err; 2888 2889 err = nf_tables_expr_parse(ctx, nla, &expr_info); 2890 if (err < 0) 2891 goto err_expr_parse; 2892 2893 err = -EOPNOTSUPP; 2894 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL)) 2895 goto err_expr_stateful; 2896 2897 err = -ENOMEM; 2898 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT); 2899 if (expr == NULL) 2900 goto err_expr_stateful; 2901 2902 err = nf_tables_newexpr(ctx, &expr_info, expr); 2903 if (err < 0) 2904 goto err_expr_new; 2905 2906 return expr; 2907 err_expr_new: 2908 kfree(expr); 2909 err_expr_stateful: 2910 owner = expr_info.ops->type->owner; 2911 if (expr_info.ops->type->release_ops) 2912 expr_info.ops->type->release_ops(expr_info.ops); 2913 2914 module_put(owner); 2915 err_expr_parse: 2916 return ERR_PTR(err); 2917 } 2918 2919 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) 2920 { 2921 int err; 2922 2923 if (src->ops->clone) { 2924 dst->ops = src->ops; 2925 err = src->ops->clone(dst, src); 2926 if (err < 0) 2927 return err; 2928 } else { 2929 memcpy(dst, src, src->ops->size); 2930 } 2931 2932 __module_get(src->ops->type->owner); 2933 2934 return 0; 2935 } 2936 2937 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) 2938 { 2939 nf_tables_expr_destroy(ctx, expr); 2940 kfree(expr); 2941 } 2942 2943 /* 2944 * Rules 2945 */ 2946 2947 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain, 2948 u64 handle) 2949 { 2950 struct nft_rule *rule; 2951 2952 // FIXME: this sucks 2953 list_for_each_entry_rcu(rule, &chain->rules, list) { 2954 if (handle == rule->handle) 2955 return rule; 2956 } 2957 2958 return ERR_PTR(-ENOENT); 2959 } 2960 2961 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain, 2962 const struct nlattr *nla) 2963 { 2964 if (nla == NULL) 2965 return ERR_PTR(-EINVAL); 2966 2967 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); 2968 } 2969 2970 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { 2971 [NFTA_RULE_TABLE] = { .type = NLA_STRING, 2972 .len = NFT_TABLE_MAXNAMELEN - 1 }, 2973 [NFTA_RULE_CHAIN] = { .type = NLA_STRING, 2974 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 2975 [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, 2976 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, 2977 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, 2978 [NFTA_RULE_POSITION] = { .type = NLA_U64 }, 2979 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, 2980 .len = NFT_USERDATA_MAXLEN }, 2981 [NFTA_RULE_ID] = { .type = NLA_U32 }, 2982 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 }, 2983 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 }, 2984 }; 2985 2986 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, 2987 u32 portid, u32 seq, int event, 2988 u32 flags, int family, 2989 const struct nft_table *table, 2990 const struct nft_chain *chain, 2991 const struct nft_rule *rule, u64 handle) 2992 { 2993 struct nlmsghdr *nlh; 2994 const struct nft_expr *expr, *next; 2995 struct nlattr *list; 2996 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 2997 2998 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0, 2999 nft_base_seq(net)); 3000 if (!nlh) 3001 goto nla_put_failure; 3002 3003 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) 3004 goto nla_put_failure; 3005 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) 3006 goto nla_put_failure; 3007 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), 3008 NFTA_RULE_PAD)) 3009 goto nla_put_failure; 3010 3011 if (event != NFT_MSG_DELRULE && handle) { 3012 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle), 3013 NFTA_RULE_PAD)) 3014 goto nla_put_failure; 3015 } 3016 3017 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) 3018 nft_flow_rule_stats(chain, rule); 3019 3020 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS); 3021 if (list == NULL) 3022 goto nla_put_failure; 3023 nft_rule_for_each_expr(expr, next, rule) { 3024 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) 3025 goto nla_put_failure; 3026 } 3027 nla_nest_end(skb, list); 3028 3029 if (rule->udata) { 3030 struct nft_userdata *udata = nft_userdata(rule); 3031 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, 3032 udata->data) < 0) 3033 goto nla_put_failure; 3034 } 3035 3036 nlmsg_end(skb, nlh); 3037 return 0; 3038 3039 nla_put_failure: 3040 nlmsg_trim(skb, nlh); 3041 return -1; 3042 } 3043 3044 static void nf_tables_rule_notify(const struct nft_ctx *ctx, 3045 const struct nft_rule *rule, int event) 3046 { 3047 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 3048 const struct nft_rule *prule; 3049 struct sk_buff *skb; 3050 u64 handle = 0; 3051 u16 flags = 0; 3052 int err; 3053 3054 if (!ctx->report && 3055 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 3056 return; 3057 3058 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 3059 if (skb == NULL) 3060 goto err; 3061 3062 if (event == NFT_MSG_NEWRULE && 3063 !list_is_first(&rule->list, &ctx->chain->rules) && 3064 !list_is_last(&rule->list, &ctx->chain->rules)) { 3065 prule = list_prev_entry(rule, list); 3066 handle = prule->handle; 3067 } 3068 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE)) 3069 flags |= NLM_F_APPEND; 3070 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 3071 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 3072 3073 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, 3074 event, flags, ctx->family, ctx->table, 3075 ctx->chain, rule, handle); 3076 if (err < 0) { 3077 kfree_skb(skb); 3078 goto err; 3079 } 3080 3081 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 3082 return; 3083 err: 3084 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 3085 } 3086 3087 struct nft_rule_dump_ctx { 3088 char *table; 3089 char *chain; 3090 }; 3091 3092 static int __nf_tables_dump_rules(struct sk_buff *skb, 3093 unsigned int *idx, 3094 struct netlink_callback *cb, 3095 const struct nft_table *table, 3096 const struct nft_chain *chain) 3097 { 3098 struct net *net = sock_net(skb->sk); 3099 const struct nft_rule *rule, *prule; 3100 unsigned int s_idx = cb->args[0]; 3101 u64 handle; 3102 3103 prule = NULL; 3104 list_for_each_entry_rcu(rule, &chain->rules, list) { 3105 if (!nft_is_active(net, rule)) 3106 goto cont_skip; 3107 if (*idx < s_idx) 3108 goto cont; 3109 if (*idx > s_idx) { 3110 memset(&cb->args[1], 0, 3111 sizeof(cb->args) - sizeof(cb->args[0])); 3112 } 3113 if (prule) 3114 handle = prule->handle; 3115 else 3116 handle = 0; 3117 3118 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, 3119 cb->nlh->nlmsg_seq, 3120 NFT_MSG_NEWRULE, 3121 NLM_F_MULTI | NLM_F_APPEND, 3122 table->family, 3123 table, chain, rule, handle) < 0) 3124 return 1; 3125 3126 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3127 cont: 3128 prule = rule; 3129 cont_skip: 3130 (*idx)++; 3131 } 3132 return 0; 3133 } 3134 3135 static int nf_tables_dump_rules(struct sk_buff *skb, 3136 struct netlink_callback *cb) 3137 { 3138 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 3139 const struct nft_rule_dump_ctx *ctx = cb->data; 3140 struct nft_table *table; 3141 const struct nft_chain *chain; 3142 unsigned int idx = 0; 3143 struct net *net = sock_net(skb->sk); 3144 int family = nfmsg->nfgen_family; 3145 struct nftables_pernet *nft_net; 3146 3147 rcu_read_lock(); 3148 nft_net = nft_pernet(net); 3149 cb->seq = nft_net->base_seq; 3150 3151 list_for_each_entry_rcu(table, &nft_net->tables, list) { 3152 if (family != NFPROTO_UNSPEC && family != table->family) 3153 continue; 3154 3155 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0) 3156 continue; 3157 3158 if (ctx && ctx->table && ctx->chain) { 3159 struct rhlist_head *list, *tmp; 3160 3161 list = rhltable_lookup(&table->chains_ht, ctx->chain, 3162 nft_chain_ht_params); 3163 if (!list) 3164 goto done; 3165 3166 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { 3167 if (!nft_is_active(net, chain)) 3168 continue; 3169 __nf_tables_dump_rules(skb, &idx, 3170 cb, table, chain); 3171 break; 3172 } 3173 goto done; 3174 } 3175 3176 list_for_each_entry_rcu(chain, &table->chains, list) { 3177 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain)) 3178 goto done; 3179 } 3180 3181 if (ctx && ctx->table) 3182 break; 3183 } 3184 done: 3185 rcu_read_unlock(); 3186 3187 cb->args[0] = idx; 3188 return skb->len; 3189 } 3190 3191 static int nf_tables_dump_rules_start(struct netlink_callback *cb) 3192 { 3193 const struct nlattr * const *nla = cb->data; 3194 struct nft_rule_dump_ctx *ctx = NULL; 3195 3196 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { 3197 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 3198 if (!ctx) 3199 return -ENOMEM; 3200 3201 if (nla[NFTA_RULE_TABLE]) { 3202 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], 3203 GFP_ATOMIC); 3204 if (!ctx->table) { 3205 kfree(ctx); 3206 return -ENOMEM; 3207 } 3208 } 3209 if (nla[NFTA_RULE_CHAIN]) { 3210 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], 3211 GFP_ATOMIC); 3212 if (!ctx->chain) { 3213 kfree(ctx->table); 3214 kfree(ctx); 3215 return -ENOMEM; 3216 } 3217 } 3218 } 3219 3220 cb->data = ctx; 3221 return 0; 3222 } 3223 3224 static int nf_tables_dump_rules_done(struct netlink_callback *cb) 3225 { 3226 struct nft_rule_dump_ctx *ctx = cb->data; 3227 3228 if (ctx) { 3229 kfree(ctx->table); 3230 kfree(ctx->chain); 3231 kfree(ctx); 3232 } 3233 return 0; 3234 } 3235 3236 /* called with rcu_read_lock held */ 3237 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info, 3238 const struct nlattr * const nla[]) 3239 { 3240 struct netlink_ext_ack *extack = info->extack; 3241 u8 genmask = nft_genmask_cur(info->net); 3242 u8 family = info->nfmsg->nfgen_family; 3243 const struct nft_chain *chain; 3244 const struct nft_rule *rule; 3245 struct net *net = info->net; 3246 struct nft_table *table; 3247 struct sk_buff *skb2; 3248 int err; 3249 3250 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 3251 struct netlink_dump_control c = { 3252 .start= nf_tables_dump_rules_start, 3253 .dump = nf_tables_dump_rules, 3254 .done = nf_tables_dump_rules_done, 3255 .module = THIS_MODULE, 3256 .data = (void *)nla, 3257 }; 3258 3259 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 3260 } 3261 3262 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0); 3263 if (IS_ERR(table)) { 3264 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3265 return PTR_ERR(table); 3266 } 3267 3268 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask); 3269 if (IS_ERR(chain)) { 3270 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3271 return PTR_ERR(chain); 3272 } 3273 3274 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); 3275 if (IS_ERR(rule)) { 3276 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3277 return PTR_ERR(rule); 3278 } 3279 3280 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 3281 if (!skb2) 3282 return -ENOMEM; 3283 3284 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, 3285 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, 3286 family, table, chain, rule, 0); 3287 if (err < 0) 3288 goto err_fill_rule_info; 3289 3290 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 3291 3292 err_fill_rule_info: 3293 kfree_skb(skb2); 3294 return err; 3295 } 3296 3297 static void nf_tables_rule_destroy(const struct nft_ctx *ctx, 3298 struct nft_rule *rule) 3299 { 3300 struct nft_expr *expr, *next; 3301 3302 /* 3303 * Careful: some expressions might not be initialized in case this 3304 * is called on error from nf_tables_newrule(). 3305 */ 3306 expr = nft_expr_first(rule); 3307 while (nft_expr_more(rule, expr)) { 3308 next = nft_expr_next(expr); 3309 nf_tables_expr_destroy(ctx, expr); 3310 expr = next; 3311 } 3312 kfree(rule); 3313 } 3314 3315 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule) 3316 { 3317 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE); 3318 nf_tables_rule_destroy(ctx, rule); 3319 } 3320 3321 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain) 3322 { 3323 struct nft_expr *expr, *last; 3324 const struct nft_data *data; 3325 struct nft_rule *rule; 3326 int err; 3327 3328 if (ctx->level == NFT_JUMP_STACK_SIZE) 3329 return -EMLINK; 3330 3331 list_for_each_entry(rule, &chain->rules, list) { 3332 if (!nft_is_active_next(ctx->net, rule)) 3333 continue; 3334 3335 nft_rule_for_each_expr(expr, last, rule) { 3336 if (!expr->ops->validate) 3337 continue; 3338 3339 err = expr->ops->validate(ctx, expr, &data); 3340 if (err < 0) 3341 return err; 3342 } 3343 } 3344 3345 return 0; 3346 } 3347 EXPORT_SYMBOL_GPL(nft_chain_validate); 3348 3349 static int nft_table_validate(struct net *net, const struct nft_table *table) 3350 { 3351 struct nft_chain *chain; 3352 struct nft_ctx ctx = { 3353 .net = net, 3354 .family = table->family, 3355 }; 3356 int err; 3357 3358 list_for_each_entry(chain, &table->chains, list) { 3359 if (!nft_is_base_chain(chain)) 3360 continue; 3361 3362 ctx.chain = chain; 3363 err = nft_chain_validate(&ctx, chain); 3364 if (err < 0) 3365 return err; 3366 } 3367 3368 return 0; 3369 } 3370 3371 static struct nft_rule *nft_rule_lookup_byid(const struct net *net, 3372 const struct nlattr *nla); 3373 3374 #define NFT_RULE_MAXEXPRS 128 3375 3376 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info, 3377 const struct nlattr * const nla[]) 3378 { 3379 struct nftables_pernet *nft_net = nft_pernet(info->net); 3380 struct netlink_ext_ack *extack = info->extack; 3381 unsigned int size, i, n, ulen = 0, usize = 0; 3382 u8 genmask = nft_genmask_next(info->net); 3383 struct nft_rule *rule, *old_rule = NULL; 3384 struct nft_expr_info *expr_info = NULL; 3385 u8 family = info->nfmsg->nfgen_family; 3386 struct nft_flow_rule *flow = NULL; 3387 struct net *net = info->net; 3388 struct nft_userdata *udata; 3389 struct nft_table *table; 3390 struct nft_chain *chain; 3391 struct nft_trans *trans; 3392 u64 handle, pos_handle; 3393 struct nft_expr *expr; 3394 struct nft_ctx ctx; 3395 struct nlattr *tmp; 3396 int err, rem; 3397 3398 lockdep_assert_held(&nft_net->commit_mutex); 3399 3400 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 3401 NETLINK_CB(skb).portid); 3402 if (IS_ERR(table)) { 3403 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3404 return PTR_ERR(table); 3405 } 3406 3407 if (nla[NFTA_RULE_CHAIN]) { 3408 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], 3409 genmask); 3410 if (IS_ERR(chain)) { 3411 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3412 return PTR_ERR(chain); 3413 } 3414 if (nft_chain_is_bound(chain)) 3415 return -EOPNOTSUPP; 3416 3417 } else if (nla[NFTA_RULE_CHAIN_ID]) { 3418 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]); 3419 if (IS_ERR(chain)) { 3420 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]); 3421 return PTR_ERR(chain); 3422 } 3423 } else { 3424 return -EINVAL; 3425 } 3426 3427 if (nla[NFTA_RULE_HANDLE]) { 3428 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); 3429 rule = __nft_rule_lookup(chain, handle); 3430 if (IS_ERR(rule)) { 3431 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3432 return PTR_ERR(rule); 3433 } 3434 3435 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 3436 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3437 return -EEXIST; 3438 } 3439 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 3440 old_rule = rule; 3441 else 3442 return -EOPNOTSUPP; 3443 } else { 3444 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) || 3445 info->nlh->nlmsg_flags & NLM_F_REPLACE) 3446 return -EINVAL; 3447 handle = nf_tables_alloc_handle(table); 3448 3449 if (chain->use == UINT_MAX) 3450 return -EOVERFLOW; 3451 3452 if (nla[NFTA_RULE_POSITION]) { 3453 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); 3454 old_rule = __nft_rule_lookup(chain, pos_handle); 3455 if (IS_ERR(old_rule)) { 3456 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); 3457 return PTR_ERR(old_rule); 3458 } 3459 } else if (nla[NFTA_RULE_POSITION_ID]) { 3460 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]); 3461 if (IS_ERR(old_rule)) { 3462 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]); 3463 return PTR_ERR(old_rule); 3464 } 3465 } 3466 } 3467 3468 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 3469 3470 n = 0; 3471 size = 0; 3472 if (nla[NFTA_RULE_EXPRESSIONS]) { 3473 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS, 3474 sizeof(struct nft_expr_info), 3475 GFP_KERNEL); 3476 if (!expr_info) 3477 return -ENOMEM; 3478 3479 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { 3480 err = -EINVAL; 3481 if (nla_type(tmp) != NFTA_LIST_ELEM) 3482 goto err_release_expr; 3483 if (n == NFT_RULE_MAXEXPRS) 3484 goto err_release_expr; 3485 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]); 3486 if (err < 0) { 3487 NL_SET_BAD_ATTR(extack, tmp); 3488 goto err_release_expr; 3489 } 3490 size += expr_info[n].ops->size; 3491 n++; 3492 } 3493 } 3494 /* Check for overflow of dlen field */ 3495 err = -EFBIG; 3496 if (size >= 1 << 12) 3497 goto err_release_expr; 3498 3499 if (nla[NFTA_RULE_USERDATA]) { 3500 ulen = nla_len(nla[NFTA_RULE_USERDATA]); 3501 if (ulen > 0) 3502 usize = sizeof(struct nft_userdata) + ulen; 3503 } 3504 3505 err = -ENOMEM; 3506 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT); 3507 if (rule == NULL) 3508 goto err_release_expr; 3509 3510 nft_activate_next(net, rule); 3511 3512 rule->handle = handle; 3513 rule->dlen = size; 3514 rule->udata = ulen ? 1 : 0; 3515 3516 if (ulen) { 3517 udata = nft_userdata(rule); 3518 udata->len = ulen - 1; 3519 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); 3520 } 3521 3522 expr = nft_expr_first(rule); 3523 for (i = 0; i < n; i++) { 3524 err = nf_tables_newexpr(&ctx, &expr_info[i], expr); 3525 if (err < 0) { 3526 NL_SET_BAD_ATTR(extack, expr_info[i].attr); 3527 goto err_release_rule; 3528 } 3529 3530 if (expr_info[i].ops->validate) 3531 nft_validate_state_update(net, NFT_VALIDATE_NEED); 3532 3533 expr_info[i].ops = NULL; 3534 expr = nft_expr_next(expr); 3535 } 3536 3537 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) { 3538 flow = nft_flow_rule_create(net, rule); 3539 if (IS_ERR(flow)) { 3540 err = PTR_ERR(flow); 3541 goto err_release_rule; 3542 } 3543 } 3544 3545 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) { 3546 err = nft_delrule(&ctx, old_rule); 3547 if (err < 0) 3548 goto err_destroy_flow_rule; 3549 3550 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); 3551 if (trans == NULL) { 3552 err = -ENOMEM; 3553 goto err_destroy_flow_rule; 3554 } 3555 list_add_tail_rcu(&rule->list, &old_rule->list); 3556 } else { 3557 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); 3558 if (!trans) { 3559 err = -ENOMEM; 3560 goto err_destroy_flow_rule; 3561 } 3562 3563 if (info->nlh->nlmsg_flags & NLM_F_APPEND) { 3564 if (old_rule) 3565 list_add_rcu(&rule->list, &old_rule->list); 3566 else 3567 list_add_tail_rcu(&rule->list, &chain->rules); 3568 } else { 3569 if (old_rule) 3570 list_add_tail_rcu(&rule->list, &old_rule->list); 3571 else 3572 list_add_rcu(&rule->list, &chain->rules); 3573 } 3574 } 3575 kvfree(expr_info); 3576 chain->use++; 3577 3578 if (flow) 3579 nft_trans_flow_rule(trans) = flow; 3580 3581 if (nft_net->validate_state == NFT_VALIDATE_DO) 3582 return nft_table_validate(net, table); 3583 3584 return 0; 3585 3586 err_destroy_flow_rule: 3587 if (flow) 3588 nft_flow_rule_destroy(flow); 3589 err_release_rule: 3590 nf_tables_rule_release(&ctx, rule); 3591 err_release_expr: 3592 for (i = 0; i < n; i++) { 3593 if (expr_info[i].ops) { 3594 module_put(expr_info[i].ops->type->owner); 3595 if (expr_info[i].ops->type->release_ops) 3596 expr_info[i].ops->type->release_ops(expr_info[i].ops); 3597 } 3598 } 3599 kvfree(expr_info); 3600 3601 return err; 3602 } 3603 3604 static struct nft_rule *nft_rule_lookup_byid(const struct net *net, 3605 const struct nlattr *nla) 3606 { 3607 struct nftables_pernet *nft_net = nft_pernet(net); 3608 u32 id = ntohl(nla_get_be32(nla)); 3609 struct nft_trans *trans; 3610 3611 list_for_each_entry(trans, &nft_net->commit_list, list) { 3612 struct nft_rule *rule = nft_trans_rule(trans); 3613 3614 if (trans->msg_type == NFT_MSG_NEWRULE && 3615 id == nft_trans_rule_id(trans)) 3616 return rule; 3617 } 3618 return ERR_PTR(-ENOENT); 3619 } 3620 3621 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info, 3622 const struct nlattr * const nla[]) 3623 { 3624 struct netlink_ext_ack *extack = info->extack; 3625 u8 genmask = nft_genmask_next(info->net); 3626 u8 family = info->nfmsg->nfgen_family; 3627 struct nft_chain *chain = NULL; 3628 struct net *net = info->net; 3629 struct nft_table *table; 3630 struct nft_rule *rule; 3631 struct nft_ctx ctx; 3632 int err = 0; 3633 3634 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 3635 NETLINK_CB(skb).portid); 3636 if (IS_ERR(table)) { 3637 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3638 return PTR_ERR(table); 3639 } 3640 3641 if (nla[NFTA_RULE_CHAIN]) { 3642 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], 3643 genmask); 3644 if (IS_ERR(chain)) { 3645 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3646 return PTR_ERR(chain); 3647 } 3648 if (nft_chain_is_bound(chain)) 3649 return -EOPNOTSUPP; 3650 } 3651 3652 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 3653 3654 if (chain) { 3655 if (nla[NFTA_RULE_HANDLE]) { 3656 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); 3657 if (IS_ERR(rule)) { 3658 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3659 return PTR_ERR(rule); 3660 } 3661 3662 err = nft_delrule(&ctx, rule); 3663 } else if (nla[NFTA_RULE_ID]) { 3664 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]); 3665 if (IS_ERR(rule)) { 3666 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]); 3667 return PTR_ERR(rule); 3668 } 3669 3670 err = nft_delrule(&ctx, rule); 3671 } else { 3672 err = nft_delrule_by_chain(&ctx); 3673 } 3674 } else { 3675 list_for_each_entry(chain, &table->chains, list) { 3676 if (!nft_is_active_next(net, chain)) 3677 continue; 3678 3679 ctx.chain = chain; 3680 err = nft_delrule_by_chain(&ctx); 3681 if (err < 0) 3682 break; 3683 } 3684 } 3685 3686 return err; 3687 } 3688 3689 /* 3690 * Sets 3691 */ 3692 static const struct nft_set_type *nft_set_types[] = { 3693 &nft_set_hash_fast_type, 3694 &nft_set_hash_type, 3695 &nft_set_rhash_type, 3696 &nft_set_bitmap_type, 3697 &nft_set_rbtree_type, 3698 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML) 3699 &nft_set_pipapo_avx2_type, 3700 #endif 3701 &nft_set_pipapo_type, 3702 }; 3703 3704 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ 3705 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \ 3706 NFT_SET_EVAL) 3707 3708 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags) 3709 { 3710 return (flags & type->features) == (flags & NFT_SET_FEATURES); 3711 } 3712 3713 /* 3714 * Select a set implementation based on the data characteristics and the 3715 * given policy. The total memory use might not be known if no size is 3716 * given, in that case the amount of memory per element is used. 3717 */ 3718 static const struct nft_set_ops * 3719 nft_select_set_ops(const struct nft_ctx *ctx, 3720 const struct nlattr * const nla[], 3721 const struct nft_set_desc *desc, 3722 enum nft_set_policies policy) 3723 { 3724 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 3725 const struct nft_set_ops *ops, *bops; 3726 struct nft_set_estimate est, best; 3727 const struct nft_set_type *type; 3728 u32 flags = 0; 3729 int i; 3730 3731 lockdep_assert_held(&nft_net->commit_mutex); 3732 lockdep_nfnl_nft_mutex_not_held(); 3733 3734 if (nla[NFTA_SET_FLAGS] != NULL) 3735 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); 3736 3737 bops = NULL; 3738 best.size = ~0; 3739 best.lookup = ~0; 3740 best.space = ~0; 3741 3742 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) { 3743 type = nft_set_types[i]; 3744 ops = &type->ops; 3745 3746 if (!nft_set_ops_candidate(type, flags)) 3747 continue; 3748 if (!ops->estimate(desc, flags, &est)) 3749 continue; 3750 3751 switch (policy) { 3752 case NFT_SET_POL_PERFORMANCE: 3753 if (est.lookup < best.lookup) 3754 break; 3755 if (est.lookup == best.lookup && 3756 est.space < best.space) 3757 break; 3758 continue; 3759 case NFT_SET_POL_MEMORY: 3760 if (!desc->size) { 3761 if (est.space < best.space) 3762 break; 3763 if (est.space == best.space && 3764 est.lookup < best.lookup) 3765 break; 3766 } else if (est.size < best.size || !bops) { 3767 break; 3768 } 3769 continue; 3770 default: 3771 break; 3772 } 3773 3774 bops = ops; 3775 best = est; 3776 } 3777 3778 if (bops != NULL) 3779 return bops; 3780 3781 return ERR_PTR(-EOPNOTSUPP); 3782 } 3783 3784 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { 3785 [NFTA_SET_TABLE] = { .type = NLA_STRING, 3786 .len = NFT_TABLE_MAXNAMELEN - 1 }, 3787 [NFTA_SET_NAME] = { .type = NLA_STRING, 3788 .len = NFT_SET_MAXNAMELEN - 1 }, 3789 [NFTA_SET_FLAGS] = { .type = NLA_U32 }, 3790 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, 3791 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, 3792 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, 3793 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, 3794 [NFTA_SET_POLICY] = { .type = NLA_U32 }, 3795 [NFTA_SET_DESC] = { .type = NLA_NESTED }, 3796 [NFTA_SET_ID] = { .type = NLA_U32 }, 3797 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, 3798 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, 3799 [NFTA_SET_USERDATA] = { .type = NLA_BINARY, 3800 .len = NFT_USERDATA_MAXLEN }, 3801 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, 3802 [NFTA_SET_HANDLE] = { .type = NLA_U64 }, 3803 [NFTA_SET_EXPR] = { .type = NLA_NESTED }, 3804 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED }, 3805 }; 3806 3807 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { 3808 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, 3809 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED }, 3810 }; 3811 3812 static struct nft_set *nft_set_lookup(const struct nft_table *table, 3813 const struct nlattr *nla, u8 genmask) 3814 { 3815 struct nft_set *set; 3816 3817 if (nla == NULL) 3818 return ERR_PTR(-EINVAL); 3819 3820 list_for_each_entry_rcu(set, &table->sets, list) { 3821 if (!nla_strcmp(nla, set->name) && 3822 nft_active_genmask(set, genmask)) 3823 return set; 3824 } 3825 return ERR_PTR(-ENOENT); 3826 } 3827 3828 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table, 3829 const struct nlattr *nla, 3830 u8 genmask) 3831 { 3832 struct nft_set *set; 3833 3834 list_for_each_entry(set, &table->sets, list) { 3835 if (be64_to_cpu(nla_get_be64(nla)) == set->handle && 3836 nft_active_genmask(set, genmask)) 3837 return set; 3838 } 3839 return ERR_PTR(-ENOENT); 3840 } 3841 3842 static struct nft_set *nft_set_lookup_byid(const struct net *net, 3843 const struct nlattr *nla, u8 genmask) 3844 { 3845 struct nftables_pernet *nft_net = nft_pernet(net); 3846 u32 id = ntohl(nla_get_be32(nla)); 3847 struct nft_trans *trans; 3848 3849 list_for_each_entry(trans, &nft_net->commit_list, list) { 3850 if (trans->msg_type == NFT_MSG_NEWSET) { 3851 struct nft_set *set = nft_trans_set(trans); 3852 3853 if (id == nft_trans_set_id(trans) && 3854 nft_active_genmask(set, genmask)) 3855 return set; 3856 } 3857 } 3858 return ERR_PTR(-ENOENT); 3859 } 3860 3861 struct nft_set *nft_set_lookup_global(const struct net *net, 3862 const struct nft_table *table, 3863 const struct nlattr *nla_set_name, 3864 const struct nlattr *nla_set_id, 3865 u8 genmask) 3866 { 3867 struct nft_set *set; 3868 3869 set = nft_set_lookup(table, nla_set_name, genmask); 3870 if (IS_ERR(set)) { 3871 if (!nla_set_id) 3872 return set; 3873 3874 set = nft_set_lookup_byid(net, nla_set_id, genmask); 3875 } 3876 return set; 3877 } 3878 EXPORT_SYMBOL_GPL(nft_set_lookup_global); 3879 3880 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, 3881 const char *name) 3882 { 3883 const struct nft_set *i; 3884 const char *p; 3885 unsigned long *inuse; 3886 unsigned int n = 0, min = 0; 3887 3888 p = strchr(name, '%'); 3889 if (p != NULL) { 3890 if (p[1] != 'd' || strchr(p + 2, '%')) 3891 return -EINVAL; 3892 3893 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); 3894 if (inuse == NULL) 3895 return -ENOMEM; 3896 cont: 3897 list_for_each_entry(i, &ctx->table->sets, list) { 3898 int tmp; 3899 3900 if (!nft_is_active_next(ctx->net, set)) 3901 continue; 3902 if (!sscanf(i->name, name, &tmp)) 3903 continue; 3904 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) 3905 continue; 3906 3907 set_bit(tmp - min, inuse); 3908 } 3909 3910 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); 3911 if (n >= BITS_PER_BYTE * PAGE_SIZE) { 3912 min += BITS_PER_BYTE * PAGE_SIZE; 3913 memset(inuse, 0, PAGE_SIZE); 3914 goto cont; 3915 } 3916 free_page((unsigned long)inuse); 3917 } 3918 3919 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n); 3920 if (!set->name) 3921 return -ENOMEM; 3922 3923 list_for_each_entry(i, &ctx->table->sets, list) { 3924 if (!nft_is_active_next(ctx->net, i)) 3925 continue; 3926 if (!strcmp(set->name, i->name)) { 3927 kfree(set->name); 3928 set->name = NULL; 3929 return -ENFILE; 3930 } 3931 } 3932 return 0; 3933 } 3934 3935 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result) 3936 { 3937 u64 ms = be64_to_cpu(nla_get_be64(nla)); 3938 u64 max = (u64)(~((u64)0)); 3939 3940 max = div_u64(max, NSEC_PER_MSEC); 3941 if (ms >= max) 3942 return -ERANGE; 3943 3944 ms *= NSEC_PER_MSEC; 3945 *result = nsecs_to_jiffies64(ms); 3946 return 0; 3947 } 3948 3949 __be64 nf_jiffies64_to_msecs(u64 input) 3950 { 3951 return cpu_to_be64(jiffies64_to_msecs(input)); 3952 } 3953 3954 static int nf_tables_fill_set_concat(struct sk_buff *skb, 3955 const struct nft_set *set) 3956 { 3957 struct nlattr *concat, *field; 3958 int i; 3959 3960 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT); 3961 if (!concat) 3962 return -ENOMEM; 3963 3964 for (i = 0; i < set->field_count; i++) { 3965 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); 3966 if (!field) 3967 return -ENOMEM; 3968 3969 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN, 3970 htonl(set->field_len[i]))) 3971 return -ENOMEM; 3972 3973 nla_nest_end(skb, field); 3974 } 3975 3976 nla_nest_end(skb, concat); 3977 3978 return 0; 3979 } 3980 3981 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, 3982 const struct nft_set *set, u16 event, u16 flags) 3983 { 3984 struct nlmsghdr *nlh; 3985 u32 portid = ctx->portid; 3986 struct nlattr *nest; 3987 u32 seq = ctx->seq; 3988 int i; 3989 3990 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 3991 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family, 3992 NFNETLINK_V0, nft_base_seq(ctx->net)); 3993 if (!nlh) 3994 goto nla_put_failure; 3995 3996 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) 3997 goto nla_put_failure; 3998 if (nla_put_string(skb, NFTA_SET_NAME, set->name)) 3999 goto nla_put_failure; 4000 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle), 4001 NFTA_SET_PAD)) 4002 goto nla_put_failure; 4003 if (set->flags != 0) 4004 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) 4005 goto nla_put_failure; 4006 4007 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) 4008 goto nla_put_failure; 4009 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) 4010 goto nla_put_failure; 4011 if (set->flags & NFT_SET_MAP) { 4012 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) 4013 goto nla_put_failure; 4014 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) 4015 goto nla_put_failure; 4016 } 4017 if (set->flags & NFT_SET_OBJECT && 4018 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) 4019 goto nla_put_failure; 4020 4021 if (set->timeout && 4022 nla_put_be64(skb, NFTA_SET_TIMEOUT, 4023 nf_jiffies64_to_msecs(set->timeout), 4024 NFTA_SET_PAD)) 4025 goto nla_put_failure; 4026 if (set->gc_int && 4027 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) 4028 goto nla_put_failure; 4029 4030 if (set->policy != NFT_SET_POL_PERFORMANCE) { 4031 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) 4032 goto nla_put_failure; 4033 } 4034 4035 if (set->udata && 4036 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) 4037 goto nla_put_failure; 4038 4039 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC); 4040 if (!nest) 4041 goto nla_put_failure; 4042 if (set->size && 4043 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) 4044 goto nla_put_failure; 4045 4046 if (set->field_count > 1 && 4047 nf_tables_fill_set_concat(skb, set)) 4048 goto nla_put_failure; 4049 4050 nla_nest_end(skb, nest); 4051 4052 if (set->num_exprs == 1) { 4053 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR); 4054 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0) 4055 goto nla_put_failure; 4056 4057 nla_nest_end(skb, nest); 4058 } else if (set->num_exprs > 1) { 4059 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS); 4060 if (nest == NULL) 4061 goto nla_put_failure; 4062 4063 for (i = 0; i < set->num_exprs; i++) { 4064 if (nft_expr_dump(skb, NFTA_LIST_ELEM, 4065 set->exprs[i]) < 0) 4066 goto nla_put_failure; 4067 } 4068 nla_nest_end(skb, nest); 4069 } 4070 4071 nlmsg_end(skb, nlh); 4072 return 0; 4073 4074 nla_put_failure: 4075 nlmsg_trim(skb, nlh); 4076 return -1; 4077 } 4078 4079 static void nf_tables_set_notify(const struct nft_ctx *ctx, 4080 const struct nft_set *set, int event, 4081 gfp_t gfp_flags) 4082 { 4083 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 4084 u32 portid = ctx->portid; 4085 struct sk_buff *skb; 4086 u16 flags = 0; 4087 int err; 4088 4089 if (!ctx->report && 4090 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 4091 return; 4092 4093 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); 4094 if (skb == NULL) 4095 goto err; 4096 4097 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 4098 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 4099 4100 err = nf_tables_fill_set(skb, ctx, set, event, flags); 4101 if (err < 0) { 4102 kfree_skb(skb); 4103 goto err; 4104 } 4105 4106 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 4107 return; 4108 err: 4109 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 4110 } 4111 4112 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) 4113 { 4114 const struct nft_set *set; 4115 unsigned int idx, s_idx = cb->args[0]; 4116 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; 4117 struct net *net = sock_net(skb->sk); 4118 struct nft_ctx *ctx = cb->data, ctx_set; 4119 struct nftables_pernet *nft_net; 4120 4121 if (cb->args[1]) 4122 return skb->len; 4123 4124 rcu_read_lock(); 4125 nft_net = nft_pernet(net); 4126 cb->seq = nft_net->base_seq; 4127 4128 list_for_each_entry_rcu(table, &nft_net->tables, list) { 4129 if (ctx->family != NFPROTO_UNSPEC && 4130 ctx->family != table->family) 4131 continue; 4132 4133 if (ctx->table && ctx->table != table) 4134 continue; 4135 4136 if (cur_table) { 4137 if (cur_table != table) 4138 continue; 4139 4140 cur_table = NULL; 4141 } 4142 idx = 0; 4143 list_for_each_entry_rcu(set, &table->sets, list) { 4144 if (idx < s_idx) 4145 goto cont; 4146 if (!nft_is_active(net, set)) 4147 goto cont; 4148 4149 ctx_set = *ctx; 4150 ctx_set.table = table; 4151 ctx_set.family = table->family; 4152 4153 if (nf_tables_fill_set(skb, &ctx_set, set, 4154 NFT_MSG_NEWSET, 4155 NLM_F_MULTI) < 0) { 4156 cb->args[0] = idx; 4157 cb->args[2] = (unsigned long) table; 4158 goto done; 4159 } 4160 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4161 cont: 4162 idx++; 4163 } 4164 if (s_idx) 4165 s_idx = 0; 4166 } 4167 cb->args[1] = 1; 4168 done: 4169 rcu_read_unlock(); 4170 return skb->len; 4171 } 4172 4173 static int nf_tables_dump_sets_start(struct netlink_callback *cb) 4174 { 4175 struct nft_ctx *ctx_dump = NULL; 4176 4177 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC); 4178 if (ctx_dump == NULL) 4179 return -ENOMEM; 4180 4181 cb->data = ctx_dump; 4182 return 0; 4183 } 4184 4185 static int nf_tables_dump_sets_done(struct netlink_callback *cb) 4186 { 4187 kfree(cb->data); 4188 return 0; 4189 } 4190 4191 /* called with rcu_read_lock held */ 4192 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info, 4193 const struct nlattr * const nla[]) 4194 { 4195 struct netlink_ext_ack *extack = info->extack; 4196 u8 genmask = nft_genmask_cur(info->net); 4197 u8 family = info->nfmsg->nfgen_family; 4198 struct nft_table *table = NULL; 4199 struct net *net = info->net; 4200 const struct nft_set *set; 4201 struct sk_buff *skb2; 4202 struct nft_ctx ctx; 4203 int err; 4204 4205 if (nla[NFTA_SET_TABLE]) { 4206 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, 4207 genmask, 0); 4208 if (IS_ERR(table)) { 4209 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4210 return PTR_ERR(table); 4211 } 4212 } 4213 4214 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4215 4216 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 4217 struct netlink_dump_control c = { 4218 .start = nf_tables_dump_sets_start, 4219 .dump = nf_tables_dump_sets, 4220 .done = nf_tables_dump_sets_done, 4221 .data = &ctx, 4222 .module = THIS_MODULE, 4223 }; 4224 4225 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 4226 } 4227 4228 /* Only accept unspec with dump */ 4229 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC) 4230 return -EAFNOSUPPORT; 4231 if (!nla[NFTA_SET_TABLE]) 4232 return -EINVAL; 4233 4234 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); 4235 if (IS_ERR(set)) 4236 return PTR_ERR(set); 4237 4238 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 4239 if (skb2 == NULL) 4240 return -ENOMEM; 4241 4242 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); 4243 if (err < 0) 4244 goto err_fill_set_info; 4245 4246 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 4247 4248 err_fill_set_info: 4249 kfree_skb(skb2); 4250 return err; 4251 } 4252 4253 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = { 4254 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 }, 4255 }; 4256 4257 static int nft_set_desc_concat_parse(const struct nlattr *attr, 4258 struct nft_set_desc *desc) 4259 { 4260 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1]; 4261 u32 len; 4262 int err; 4263 4264 if (desc->field_count >= ARRAY_SIZE(desc->field_len)) 4265 return -E2BIG; 4266 4267 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr, 4268 nft_concat_policy, NULL); 4269 if (err < 0) 4270 return err; 4271 4272 if (!tb[NFTA_SET_FIELD_LEN]) 4273 return -EINVAL; 4274 4275 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN])); 4276 if (!len || len > U8_MAX) 4277 return -EINVAL; 4278 4279 desc->field_len[desc->field_count++] = len; 4280 4281 return 0; 4282 } 4283 4284 static int nft_set_desc_concat(struct nft_set_desc *desc, 4285 const struct nlattr *nla) 4286 { 4287 struct nlattr *attr; 4288 u32 num_regs = 0; 4289 int rem, err, i; 4290 4291 nla_for_each_nested(attr, nla, rem) { 4292 if (nla_type(attr) != NFTA_LIST_ELEM) 4293 return -EINVAL; 4294 4295 err = nft_set_desc_concat_parse(attr, desc); 4296 if (err < 0) 4297 return err; 4298 } 4299 4300 for (i = 0; i < desc->field_count; i++) 4301 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32)); 4302 4303 if (num_regs > NFT_REG32_COUNT) 4304 return -E2BIG; 4305 4306 return 0; 4307 } 4308 4309 static int nf_tables_set_desc_parse(struct nft_set_desc *desc, 4310 const struct nlattr *nla) 4311 { 4312 struct nlattr *da[NFTA_SET_DESC_MAX + 1]; 4313 int err; 4314 4315 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla, 4316 nft_set_desc_policy, NULL); 4317 if (err < 0) 4318 return err; 4319 4320 if (da[NFTA_SET_DESC_SIZE] != NULL) 4321 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); 4322 if (da[NFTA_SET_DESC_CONCAT]) 4323 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]); 4324 4325 return err; 4326 } 4327 4328 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, 4329 const struct nlattr * const nla[]) 4330 { 4331 u32 ktype, dtype, flags, policy, gc_int, objtype; 4332 struct netlink_ext_ack *extack = info->extack; 4333 u8 genmask = nft_genmask_next(info->net); 4334 u8 family = info->nfmsg->nfgen_family; 4335 const struct nft_set_ops *ops; 4336 struct nft_expr *expr = NULL; 4337 struct net *net = info->net; 4338 struct nft_set_desc desc; 4339 struct nft_table *table; 4340 unsigned char *udata; 4341 struct nft_set *set; 4342 struct nft_ctx ctx; 4343 size_t alloc_size; 4344 u64 timeout; 4345 char *name; 4346 int err, i; 4347 u16 udlen; 4348 u64 size; 4349 4350 if (nla[NFTA_SET_TABLE] == NULL || 4351 nla[NFTA_SET_NAME] == NULL || 4352 nla[NFTA_SET_KEY_LEN] == NULL || 4353 nla[NFTA_SET_ID] == NULL) 4354 return -EINVAL; 4355 4356 memset(&desc, 0, sizeof(desc)); 4357 4358 ktype = NFT_DATA_VALUE; 4359 if (nla[NFTA_SET_KEY_TYPE] != NULL) { 4360 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); 4361 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) 4362 return -EINVAL; 4363 } 4364 4365 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); 4366 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) 4367 return -EINVAL; 4368 4369 flags = 0; 4370 if (nla[NFTA_SET_FLAGS] != NULL) { 4371 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); 4372 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | 4373 NFT_SET_INTERVAL | NFT_SET_TIMEOUT | 4374 NFT_SET_MAP | NFT_SET_EVAL | 4375 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR)) 4376 return -EOPNOTSUPP; 4377 /* Only one of these operations is supported */ 4378 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) == 4379 (NFT_SET_MAP | NFT_SET_OBJECT)) 4380 return -EOPNOTSUPP; 4381 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) == 4382 (NFT_SET_EVAL | NFT_SET_OBJECT)) 4383 return -EOPNOTSUPP; 4384 } 4385 4386 dtype = 0; 4387 if (nla[NFTA_SET_DATA_TYPE] != NULL) { 4388 if (!(flags & NFT_SET_MAP)) 4389 return -EINVAL; 4390 4391 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); 4392 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && 4393 dtype != NFT_DATA_VERDICT) 4394 return -EINVAL; 4395 4396 if (dtype != NFT_DATA_VERDICT) { 4397 if (nla[NFTA_SET_DATA_LEN] == NULL) 4398 return -EINVAL; 4399 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); 4400 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) 4401 return -EINVAL; 4402 } else 4403 desc.dlen = sizeof(struct nft_verdict); 4404 } else if (flags & NFT_SET_MAP) 4405 return -EINVAL; 4406 4407 if (nla[NFTA_SET_OBJ_TYPE] != NULL) { 4408 if (!(flags & NFT_SET_OBJECT)) 4409 return -EINVAL; 4410 4411 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); 4412 if (objtype == NFT_OBJECT_UNSPEC || 4413 objtype > NFT_OBJECT_MAX) 4414 return -EOPNOTSUPP; 4415 } else if (flags & NFT_SET_OBJECT) 4416 return -EINVAL; 4417 else 4418 objtype = NFT_OBJECT_UNSPEC; 4419 4420 timeout = 0; 4421 if (nla[NFTA_SET_TIMEOUT] != NULL) { 4422 if (!(flags & NFT_SET_TIMEOUT)) 4423 return -EINVAL; 4424 4425 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout); 4426 if (err) 4427 return err; 4428 } 4429 gc_int = 0; 4430 if (nla[NFTA_SET_GC_INTERVAL] != NULL) { 4431 if (!(flags & NFT_SET_TIMEOUT)) 4432 return -EINVAL; 4433 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); 4434 } 4435 4436 policy = NFT_SET_POL_PERFORMANCE; 4437 if (nla[NFTA_SET_POLICY] != NULL) 4438 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); 4439 4440 if (nla[NFTA_SET_DESC] != NULL) { 4441 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]); 4442 if (err < 0) 4443 return err; 4444 } 4445 4446 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS]) 4447 desc.expr = true; 4448 4449 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask, 4450 NETLINK_CB(skb).portid); 4451 if (IS_ERR(table)) { 4452 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4453 return PTR_ERR(table); 4454 } 4455 4456 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4457 4458 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); 4459 if (IS_ERR(set)) { 4460 if (PTR_ERR(set) != -ENOENT) { 4461 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); 4462 return PTR_ERR(set); 4463 } 4464 } else { 4465 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 4466 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); 4467 return -EEXIST; 4468 } 4469 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 4470 return -EOPNOTSUPP; 4471 4472 return 0; 4473 } 4474 4475 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) 4476 return -ENOENT; 4477 4478 ops = nft_select_set_ops(&ctx, nla, &desc, policy); 4479 if (IS_ERR(ops)) 4480 return PTR_ERR(ops); 4481 4482 udlen = 0; 4483 if (nla[NFTA_SET_USERDATA]) 4484 udlen = nla_len(nla[NFTA_SET_USERDATA]); 4485 4486 size = 0; 4487 if (ops->privsize != NULL) 4488 size = ops->privsize(nla, &desc); 4489 alloc_size = sizeof(*set) + size + udlen; 4490 if (alloc_size < size || alloc_size > INT_MAX) 4491 return -ENOMEM; 4492 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT); 4493 if (!set) 4494 return -ENOMEM; 4495 4496 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT); 4497 if (!name) { 4498 err = -ENOMEM; 4499 goto err_set_name; 4500 } 4501 4502 err = nf_tables_set_alloc_name(&ctx, set, name); 4503 kfree(name); 4504 if (err < 0) 4505 goto err_set_name; 4506 4507 udata = NULL; 4508 if (udlen) { 4509 udata = set->data + size; 4510 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); 4511 } 4512 4513 INIT_LIST_HEAD(&set->bindings); 4514 INIT_LIST_HEAD(&set->catchall_list); 4515 set->table = table; 4516 write_pnet(&set->net, net); 4517 set->ops = ops; 4518 set->ktype = ktype; 4519 set->klen = desc.klen; 4520 set->dtype = dtype; 4521 set->objtype = objtype; 4522 set->dlen = desc.dlen; 4523 set->flags = flags; 4524 set->size = desc.size; 4525 set->policy = policy; 4526 set->udlen = udlen; 4527 set->udata = udata; 4528 set->timeout = timeout; 4529 set->gc_int = gc_int; 4530 4531 set->field_count = desc.field_count; 4532 for (i = 0; i < desc.field_count; i++) 4533 set->field_len[i] = desc.field_len[i]; 4534 4535 err = ops->init(set, &desc, nla); 4536 if (err < 0) 4537 goto err_set_init; 4538 4539 if (nla[NFTA_SET_EXPR]) { 4540 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]); 4541 if (IS_ERR(expr)) { 4542 err = PTR_ERR(expr); 4543 goto err_set_expr_alloc; 4544 } 4545 set->exprs[0] = expr; 4546 set->num_exprs++; 4547 } else if (nla[NFTA_SET_EXPRESSIONS]) { 4548 struct nft_expr *expr; 4549 struct nlattr *tmp; 4550 int left; 4551 4552 if (!(flags & NFT_SET_EXPR)) { 4553 err = -EINVAL; 4554 goto err_set_expr_alloc; 4555 } 4556 i = 0; 4557 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) { 4558 if (i == NFT_SET_EXPR_MAX) { 4559 err = -E2BIG; 4560 goto err_set_expr_alloc; 4561 } 4562 if (nla_type(tmp) != NFTA_LIST_ELEM) { 4563 err = -EINVAL; 4564 goto err_set_expr_alloc; 4565 } 4566 expr = nft_set_elem_expr_alloc(&ctx, set, tmp); 4567 if (IS_ERR(expr)) { 4568 err = PTR_ERR(expr); 4569 goto err_set_expr_alloc; 4570 } 4571 set->exprs[i++] = expr; 4572 set->num_exprs++; 4573 } 4574 } 4575 4576 set->handle = nf_tables_alloc_handle(table); 4577 4578 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); 4579 if (err < 0) 4580 goto err_set_expr_alloc; 4581 4582 list_add_tail_rcu(&set->list, &table->sets); 4583 table->use++; 4584 return 0; 4585 4586 err_set_expr_alloc: 4587 for (i = 0; i < set->num_exprs; i++) 4588 nft_expr_destroy(&ctx, set->exprs[i]); 4589 4590 ops->destroy(set); 4591 err_set_init: 4592 kfree(set->name); 4593 err_set_name: 4594 kvfree(set); 4595 return err; 4596 } 4597 4598 struct nft_set_elem_catchall { 4599 struct list_head list; 4600 struct rcu_head rcu; 4601 void *elem; 4602 }; 4603 4604 static void nft_set_catchall_destroy(const struct nft_ctx *ctx, 4605 struct nft_set *set) 4606 { 4607 struct nft_set_elem_catchall *next, *catchall; 4608 4609 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 4610 list_del_rcu(&catchall->list); 4611 nft_set_elem_destroy(set, catchall->elem, true); 4612 kfree_rcu(catchall, rcu); 4613 } 4614 } 4615 4616 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) 4617 { 4618 int i; 4619 4620 if (WARN_ON(set->use > 0)) 4621 return; 4622 4623 for (i = 0; i < set->num_exprs; i++) 4624 nft_expr_destroy(ctx, set->exprs[i]); 4625 4626 set->ops->destroy(set); 4627 nft_set_catchall_destroy(ctx, set); 4628 kfree(set->name); 4629 kvfree(set); 4630 } 4631 4632 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info, 4633 const struct nlattr * const nla[]) 4634 { 4635 struct netlink_ext_ack *extack = info->extack; 4636 u8 genmask = nft_genmask_next(info->net); 4637 u8 family = info->nfmsg->nfgen_family; 4638 struct net *net = info->net; 4639 const struct nlattr *attr; 4640 struct nft_table *table; 4641 struct nft_set *set; 4642 struct nft_ctx ctx; 4643 4644 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC) 4645 return -EAFNOSUPPORT; 4646 4647 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, 4648 genmask, NETLINK_CB(skb).portid); 4649 if (IS_ERR(table)) { 4650 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4651 return PTR_ERR(table); 4652 } 4653 4654 if (nla[NFTA_SET_HANDLE]) { 4655 attr = nla[NFTA_SET_HANDLE]; 4656 set = nft_set_lookup_byhandle(table, attr, genmask); 4657 } else { 4658 attr = nla[NFTA_SET_NAME]; 4659 set = nft_set_lookup(table, attr, genmask); 4660 } 4661 4662 if (IS_ERR(set)) { 4663 NL_SET_BAD_ATTR(extack, attr); 4664 return PTR_ERR(set); 4665 } 4666 if (set->use || 4667 (info->nlh->nlmsg_flags & NLM_F_NONREC && 4668 atomic_read(&set->nelems) > 0)) { 4669 NL_SET_BAD_ATTR(extack, attr); 4670 return -EBUSY; 4671 } 4672 4673 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4674 4675 return nft_delset(&ctx, set); 4676 } 4677 4678 static int nft_validate_register_store(const struct nft_ctx *ctx, 4679 enum nft_registers reg, 4680 const struct nft_data *data, 4681 enum nft_data_types type, 4682 unsigned int len); 4683 4684 static int nft_setelem_data_validate(const struct nft_ctx *ctx, 4685 struct nft_set *set, 4686 struct nft_set_elem *elem) 4687 { 4688 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 4689 enum nft_registers dreg; 4690 4691 dreg = nft_type_to_reg(set->dtype); 4692 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), 4693 set->dtype == NFT_DATA_VERDICT ? 4694 NFT_DATA_VERDICT : NFT_DATA_VALUE, 4695 set->dlen); 4696 } 4697 4698 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, 4699 struct nft_set *set, 4700 const struct nft_set_iter *iter, 4701 struct nft_set_elem *elem) 4702 { 4703 return nft_setelem_data_validate(ctx, set, elem); 4704 } 4705 4706 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx, 4707 struct nft_set *set) 4708 { 4709 u8 genmask = nft_genmask_next(ctx->net); 4710 struct nft_set_elem_catchall *catchall; 4711 struct nft_set_elem elem; 4712 struct nft_set_ext *ext; 4713 int ret = 0; 4714 4715 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 4716 ext = nft_set_elem_ext(set, catchall->elem); 4717 if (!nft_set_elem_active(ext, genmask)) 4718 continue; 4719 4720 elem.priv = catchall->elem; 4721 ret = nft_setelem_data_validate(ctx, set, &elem); 4722 if (ret < 0) 4723 break; 4724 } 4725 4726 return ret; 4727 } 4728 4729 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 4730 struct nft_set_binding *binding) 4731 { 4732 struct nft_set_binding *i; 4733 struct nft_set_iter iter; 4734 4735 if (set->use == UINT_MAX) 4736 return -EOVERFLOW; 4737 4738 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) 4739 return -EBUSY; 4740 4741 if (binding->flags & NFT_SET_MAP) { 4742 /* If the set is already bound to the same chain all 4743 * jumps are already validated for that chain. 4744 */ 4745 list_for_each_entry(i, &set->bindings, list) { 4746 if (i->flags & NFT_SET_MAP && 4747 i->chain == binding->chain) 4748 goto bind; 4749 } 4750 4751 iter.genmask = nft_genmask_next(ctx->net); 4752 iter.skip = 0; 4753 iter.count = 0; 4754 iter.err = 0; 4755 iter.fn = nf_tables_bind_check_setelem; 4756 4757 set->ops->walk(ctx, set, &iter); 4758 if (!iter.err) 4759 iter.err = nft_set_catchall_bind_check(ctx, set); 4760 4761 if (iter.err < 0) 4762 return iter.err; 4763 } 4764 bind: 4765 binding->chain = ctx->chain; 4766 list_add_tail_rcu(&binding->list, &set->bindings); 4767 nft_set_trans_bind(ctx, set); 4768 set->use++; 4769 4770 return 0; 4771 } 4772 EXPORT_SYMBOL_GPL(nf_tables_bind_set); 4773 4774 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, 4775 struct nft_set_binding *binding, bool event) 4776 { 4777 list_del_rcu(&binding->list); 4778 4779 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) { 4780 list_del_rcu(&set->list); 4781 if (event) 4782 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, 4783 GFP_KERNEL); 4784 } 4785 } 4786 4787 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 4788 struct nft_set_binding *binding, 4789 enum nft_trans_phase phase) 4790 { 4791 switch (phase) { 4792 case NFT_TRANS_PREPARE: 4793 set->use--; 4794 return; 4795 case NFT_TRANS_ABORT: 4796 case NFT_TRANS_RELEASE: 4797 set->use--; 4798 fallthrough; 4799 default: 4800 nf_tables_unbind_set(ctx, set, binding, 4801 phase == NFT_TRANS_COMMIT); 4802 } 4803 } 4804 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set); 4805 4806 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set) 4807 { 4808 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) 4809 nft_set_destroy(ctx, set); 4810 } 4811 EXPORT_SYMBOL_GPL(nf_tables_destroy_set); 4812 4813 const struct nft_set_ext_type nft_set_ext_types[] = { 4814 [NFT_SET_EXT_KEY] = { 4815 .align = __alignof__(u32), 4816 }, 4817 [NFT_SET_EXT_DATA] = { 4818 .align = __alignof__(u32), 4819 }, 4820 [NFT_SET_EXT_EXPRESSIONS] = { 4821 .align = __alignof__(struct nft_set_elem_expr), 4822 }, 4823 [NFT_SET_EXT_OBJREF] = { 4824 .len = sizeof(struct nft_object *), 4825 .align = __alignof__(struct nft_object *), 4826 }, 4827 [NFT_SET_EXT_FLAGS] = { 4828 .len = sizeof(u8), 4829 .align = __alignof__(u8), 4830 }, 4831 [NFT_SET_EXT_TIMEOUT] = { 4832 .len = sizeof(u64), 4833 .align = __alignof__(u64), 4834 }, 4835 [NFT_SET_EXT_EXPIRATION] = { 4836 .len = sizeof(u64), 4837 .align = __alignof__(u64), 4838 }, 4839 [NFT_SET_EXT_USERDATA] = { 4840 .len = sizeof(struct nft_userdata), 4841 .align = __alignof__(struct nft_userdata), 4842 }, 4843 [NFT_SET_EXT_KEY_END] = { 4844 .align = __alignof__(u32), 4845 }, 4846 }; 4847 4848 /* 4849 * Set elements 4850 */ 4851 4852 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { 4853 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, 4854 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, 4855 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, 4856 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, 4857 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 }, 4858 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, 4859 .len = NFT_USERDATA_MAXLEN }, 4860 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED }, 4861 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING, 4862 .len = NFT_OBJ_MAXNAMELEN - 1 }, 4863 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED }, 4864 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED }, 4865 }; 4866 4867 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { 4868 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, 4869 .len = NFT_TABLE_MAXNAMELEN - 1 }, 4870 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, 4871 .len = NFT_SET_MAXNAMELEN - 1 }, 4872 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, 4873 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, 4874 }; 4875 4876 static int nft_set_elem_expr_dump(struct sk_buff *skb, 4877 const struct nft_set *set, 4878 const struct nft_set_ext *ext) 4879 { 4880 struct nft_set_elem_expr *elem_expr; 4881 u32 size, num_exprs = 0; 4882 struct nft_expr *expr; 4883 struct nlattr *nest; 4884 4885 elem_expr = nft_set_ext_expr(ext); 4886 nft_setelem_expr_foreach(expr, elem_expr, size) 4887 num_exprs++; 4888 4889 if (num_exprs == 1) { 4890 expr = nft_setelem_expr_at(elem_expr, 0); 4891 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0) 4892 return -1; 4893 4894 return 0; 4895 } else if (num_exprs > 1) { 4896 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS); 4897 if (nest == NULL) 4898 goto nla_put_failure; 4899 4900 nft_setelem_expr_foreach(expr, elem_expr, size) { 4901 expr = nft_setelem_expr_at(elem_expr, size); 4902 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) 4903 goto nla_put_failure; 4904 } 4905 nla_nest_end(skb, nest); 4906 } 4907 return 0; 4908 4909 nla_put_failure: 4910 return -1; 4911 } 4912 4913 static int nf_tables_fill_setelem(struct sk_buff *skb, 4914 const struct nft_set *set, 4915 const struct nft_set_elem *elem) 4916 { 4917 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 4918 unsigned char *b = skb_tail_pointer(skb); 4919 struct nlattr *nest; 4920 4921 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); 4922 if (nest == NULL) 4923 goto nla_put_failure; 4924 4925 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) && 4926 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), 4927 NFT_DATA_VALUE, set->klen) < 0) 4928 goto nla_put_failure; 4929 4930 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) && 4931 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext), 4932 NFT_DATA_VALUE, set->klen) < 0) 4933 goto nla_put_failure; 4934 4935 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 4936 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), 4937 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, 4938 set->dlen) < 0) 4939 goto nla_put_failure; 4940 4941 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) && 4942 nft_set_elem_expr_dump(skb, set, ext)) 4943 goto nla_put_failure; 4944 4945 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && 4946 nla_put_string(skb, NFTA_SET_ELEM_OBJREF, 4947 (*nft_set_ext_obj(ext))->key.name) < 0) 4948 goto nla_put_failure; 4949 4950 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 4951 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, 4952 htonl(*nft_set_ext_flags(ext)))) 4953 goto nla_put_failure; 4954 4955 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && 4956 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, 4957 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)), 4958 NFTA_SET_ELEM_PAD)) 4959 goto nla_put_failure; 4960 4961 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { 4962 u64 expires, now = get_jiffies_64(); 4963 4964 expires = *nft_set_ext_expiration(ext); 4965 if (time_before64(now, expires)) 4966 expires -= now; 4967 else 4968 expires = 0; 4969 4970 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, 4971 nf_jiffies64_to_msecs(expires), 4972 NFTA_SET_ELEM_PAD)) 4973 goto nla_put_failure; 4974 } 4975 4976 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { 4977 struct nft_userdata *udata; 4978 4979 udata = nft_set_ext_userdata(ext); 4980 if (nla_put(skb, NFTA_SET_ELEM_USERDATA, 4981 udata->len + 1, udata->data)) 4982 goto nla_put_failure; 4983 } 4984 4985 nla_nest_end(skb, nest); 4986 return 0; 4987 4988 nla_put_failure: 4989 nlmsg_trim(skb, b); 4990 return -EMSGSIZE; 4991 } 4992 4993 struct nft_set_dump_args { 4994 const struct netlink_callback *cb; 4995 struct nft_set_iter iter; 4996 struct sk_buff *skb; 4997 }; 4998 4999 static int nf_tables_dump_setelem(const struct nft_ctx *ctx, 5000 struct nft_set *set, 5001 const struct nft_set_iter *iter, 5002 struct nft_set_elem *elem) 5003 { 5004 struct nft_set_dump_args *args; 5005 5006 args = container_of(iter, struct nft_set_dump_args, iter); 5007 return nf_tables_fill_setelem(args->skb, set, elem); 5008 } 5009 5010 struct nft_set_dump_ctx { 5011 const struct nft_set *set; 5012 struct nft_ctx ctx; 5013 }; 5014 5015 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb, 5016 const struct nft_set *set) 5017 { 5018 struct nft_set_elem_catchall *catchall; 5019 u8 genmask = nft_genmask_cur(net); 5020 struct nft_set_elem elem; 5021 struct nft_set_ext *ext; 5022 int ret = 0; 5023 5024 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5025 ext = nft_set_elem_ext(set, catchall->elem); 5026 if (!nft_set_elem_active(ext, genmask) || 5027 nft_set_elem_expired(ext)) 5028 continue; 5029 5030 elem.priv = catchall->elem; 5031 ret = nf_tables_fill_setelem(skb, set, &elem); 5032 break; 5033 } 5034 5035 return ret; 5036 } 5037 5038 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) 5039 { 5040 struct nft_set_dump_ctx *dump_ctx = cb->data; 5041 struct net *net = sock_net(skb->sk); 5042 struct nftables_pernet *nft_net; 5043 struct nft_table *table; 5044 struct nft_set *set; 5045 struct nft_set_dump_args args; 5046 bool set_found = false; 5047 struct nlmsghdr *nlh; 5048 struct nlattr *nest; 5049 u32 portid, seq; 5050 int event; 5051 5052 rcu_read_lock(); 5053 nft_net = nft_pernet(net); 5054 list_for_each_entry_rcu(table, &nft_net->tables, list) { 5055 if (dump_ctx->ctx.family != NFPROTO_UNSPEC && 5056 dump_ctx->ctx.family != table->family) 5057 continue; 5058 5059 if (table != dump_ctx->ctx.table) 5060 continue; 5061 5062 list_for_each_entry_rcu(set, &table->sets, list) { 5063 if (set == dump_ctx->set) { 5064 set_found = true; 5065 break; 5066 } 5067 } 5068 break; 5069 } 5070 5071 if (!set_found) { 5072 rcu_read_unlock(); 5073 return -ENOENT; 5074 } 5075 5076 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); 5077 portid = NETLINK_CB(cb->skb).portid; 5078 seq = cb->nlh->nlmsg_seq; 5079 5080 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI, 5081 table->family, NFNETLINK_V0, nft_base_seq(net)); 5082 if (!nlh) 5083 goto nla_put_failure; 5084 5085 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) 5086 goto nla_put_failure; 5087 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) 5088 goto nla_put_failure; 5089 5090 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS); 5091 if (nest == NULL) 5092 goto nla_put_failure; 5093 5094 args.cb = cb; 5095 args.skb = skb; 5096 args.iter.genmask = nft_genmask_cur(net); 5097 args.iter.skip = cb->args[0]; 5098 args.iter.count = 0; 5099 args.iter.err = 0; 5100 args.iter.fn = nf_tables_dump_setelem; 5101 set->ops->walk(&dump_ctx->ctx, set, &args.iter); 5102 5103 if (!args.iter.err && args.iter.count == cb->args[0]) 5104 args.iter.err = nft_set_catchall_dump(net, skb, set); 5105 rcu_read_unlock(); 5106 5107 nla_nest_end(skb, nest); 5108 nlmsg_end(skb, nlh); 5109 5110 if (args.iter.err && args.iter.err != -EMSGSIZE) 5111 return args.iter.err; 5112 if (args.iter.count == cb->args[0]) 5113 return 0; 5114 5115 cb->args[0] = args.iter.count; 5116 return skb->len; 5117 5118 nla_put_failure: 5119 rcu_read_unlock(); 5120 return -ENOSPC; 5121 } 5122 5123 static int nf_tables_dump_set_start(struct netlink_callback *cb) 5124 { 5125 struct nft_set_dump_ctx *dump_ctx = cb->data; 5126 5127 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC); 5128 5129 return cb->data ? 0 : -ENOMEM; 5130 } 5131 5132 static int nf_tables_dump_set_done(struct netlink_callback *cb) 5133 { 5134 kfree(cb->data); 5135 return 0; 5136 } 5137 5138 static int nf_tables_fill_setelem_info(struct sk_buff *skb, 5139 const struct nft_ctx *ctx, u32 seq, 5140 u32 portid, int event, u16 flags, 5141 const struct nft_set *set, 5142 const struct nft_set_elem *elem) 5143 { 5144 struct nlmsghdr *nlh; 5145 struct nlattr *nest; 5146 int err; 5147 5148 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 5149 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family, 5150 NFNETLINK_V0, nft_base_seq(ctx->net)); 5151 if (!nlh) 5152 goto nla_put_failure; 5153 5154 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) 5155 goto nla_put_failure; 5156 if (nla_put_string(skb, NFTA_SET_NAME, set->name)) 5157 goto nla_put_failure; 5158 5159 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS); 5160 if (nest == NULL) 5161 goto nla_put_failure; 5162 5163 err = nf_tables_fill_setelem(skb, set, elem); 5164 if (err < 0) 5165 goto nla_put_failure; 5166 5167 nla_nest_end(skb, nest); 5168 5169 nlmsg_end(skb, nlh); 5170 return 0; 5171 5172 nla_put_failure: 5173 nlmsg_trim(skb, nlh); 5174 return -1; 5175 } 5176 5177 static int nft_setelem_parse_flags(const struct nft_set *set, 5178 const struct nlattr *attr, u32 *flags) 5179 { 5180 if (attr == NULL) 5181 return 0; 5182 5183 *flags = ntohl(nla_get_be32(attr)); 5184 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) 5185 return -EOPNOTSUPP; 5186 if (!(set->flags & NFT_SET_INTERVAL) && 5187 *flags & NFT_SET_ELEM_INTERVAL_END) 5188 return -EINVAL; 5189 5190 return 0; 5191 } 5192 5193 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set, 5194 struct nft_data *key, struct nlattr *attr) 5195 { 5196 struct nft_data_desc desc; 5197 int err; 5198 5199 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr); 5200 if (err < 0) 5201 return err; 5202 5203 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) { 5204 nft_data_release(key, desc.type); 5205 return -EINVAL; 5206 } 5207 5208 return 0; 5209 } 5210 5211 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set, 5212 struct nft_data_desc *desc, 5213 struct nft_data *data, 5214 struct nlattr *attr) 5215 { 5216 int err; 5217 5218 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr); 5219 if (err < 0) 5220 return err; 5221 5222 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) { 5223 nft_data_release(data, desc->type); 5224 return -EINVAL; 5225 } 5226 5227 return 0; 5228 } 5229 5230 static void *nft_setelem_catchall_get(const struct net *net, 5231 const struct nft_set *set) 5232 { 5233 struct nft_set_elem_catchall *catchall; 5234 u8 genmask = nft_genmask_cur(net); 5235 struct nft_set_ext *ext; 5236 void *priv = NULL; 5237 5238 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5239 ext = nft_set_elem_ext(set, catchall->elem); 5240 if (!nft_set_elem_active(ext, genmask) || 5241 nft_set_elem_expired(ext)) 5242 continue; 5243 5244 priv = catchall->elem; 5245 break; 5246 } 5247 5248 return priv; 5249 } 5250 5251 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set, 5252 struct nft_set_elem *elem, u32 flags) 5253 { 5254 void *priv; 5255 5256 if (!(flags & NFT_SET_ELEM_CATCHALL)) { 5257 priv = set->ops->get(ctx->net, set, elem, flags); 5258 if (IS_ERR(priv)) 5259 return PTR_ERR(priv); 5260 } else { 5261 priv = nft_setelem_catchall_get(ctx->net, set); 5262 if (!priv) 5263 return -ENOENT; 5264 } 5265 elem->priv = priv; 5266 5267 return 0; 5268 } 5269 5270 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, 5271 const struct nlattr *attr) 5272 { 5273 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 5274 struct nft_set_elem elem; 5275 struct sk_buff *skb; 5276 uint32_t flags = 0; 5277 int err; 5278 5279 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 5280 nft_set_elem_policy, NULL); 5281 if (err < 0) 5282 return err; 5283 5284 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 5285 if (err < 0) 5286 return err; 5287 5288 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 5289 return -EINVAL; 5290 5291 if (nla[NFTA_SET_ELEM_KEY]) { 5292 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 5293 nla[NFTA_SET_ELEM_KEY]); 5294 if (err < 0) 5295 return err; 5296 } 5297 5298 if (nla[NFTA_SET_ELEM_KEY_END]) { 5299 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 5300 nla[NFTA_SET_ELEM_KEY_END]); 5301 if (err < 0) 5302 return err; 5303 } 5304 5305 err = nft_setelem_get(ctx, set, &elem, flags); 5306 if (err < 0) 5307 return err; 5308 5309 err = -ENOMEM; 5310 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 5311 if (skb == NULL) 5312 return err; 5313 5314 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, 5315 NFT_MSG_NEWSETELEM, 0, set, &elem); 5316 if (err < 0) 5317 goto err_fill_setelem; 5318 5319 return nfnetlink_unicast(skb, ctx->net, ctx->portid); 5320 5321 err_fill_setelem: 5322 kfree_skb(skb); 5323 return err; 5324 } 5325 5326 /* called with rcu_read_lock held */ 5327 static int nf_tables_getsetelem(struct sk_buff *skb, 5328 const struct nfnl_info *info, 5329 const struct nlattr * const nla[]) 5330 { 5331 struct netlink_ext_ack *extack = info->extack; 5332 u8 genmask = nft_genmask_cur(info->net); 5333 u8 family = info->nfmsg->nfgen_family; 5334 struct net *net = info->net; 5335 struct nft_table *table; 5336 struct nft_set *set; 5337 struct nlattr *attr; 5338 struct nft_ctx ctx; 5339 int rem, err = 0; 5340 5341 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 5342 genmask, NETLINK_CB(skb).portid); 5343 if (IS_ERR(table)) { 5344 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 5345 return PTR_ERR(table); 5346 } 5347 5348 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask); 5349 if (IS_ERR(set)) 5350 return PTR_ERR(set); 5351 5352 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 5353 5354 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 5355 struct netlink_dump_control c = { 5356 .start = nf_tables_dump_set_start, 5357 .dump = nf_tables_dump_set, 5358 .done = nf_tables_dump_set_done, 5359 .module = THIS_MODULE, 5360 }; 5361 struct nft_set_dump_ctx dump_ctx = { 5362 .set = set, 5363 .ctx = ctx, 5364 }; 5365 5366 c.data = &dump_ctx; 5367 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 5368 } 5369 5370 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) 5371 return -EINVAL; 5372 5373 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 5374 err = nft_get_set_elem(&ctx, set, attr); 5375 if (err < 0) { 5376 NL_SET_BAD_ATTR(extack, attr); 5377 break; 5378 } 5379 } 5380 5381 return err; 5382 } 5383 5384 static void nf_tables_setelem_notify(const struct nft_ctx *ctx, 5385 const struct nft_set *set, 5386 const struct nft_set_elem *elem, 5387 int event) 5388 { 5389 struct nftables_pernet *nft_net; 5390 struct net *net = ctx->net; 5391 u32 portid = ctx->portid; 5392 struct sk_buff *skb; 5393 u16 flags = 0; 5394 int err; 5395 5396 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 5397 return; 5398 5399 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 5400 if (skb == NULL) 5401 goto err; 5402 5403 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 5404 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 5405 5406 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, 5407 set, elem); 5408 if (err < 0) { 5409 kfree_skb(skb); 5410 goto err; 5411 } 5412 5413 nft_net = nft_pernet(net); 5414 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 5415 return; 5416 err: 5417 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 5418 } 5419 5420 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, 5421 int msg_type, 5422 struct nft_set *set) 5423 { 5424 struct nft_trans *trans; 5425 5426 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); 5427 if (trans == NULL) 5428 return NULL; 5429 5430 nft_trans_elem_set(trans) = set; 5431 return trans; 5432 } 5433 5434 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 5435 const struct nft_set *set, 5436 const struct nlattr *attr) 5437 { 5438 struct nft_expr *expr; 5439 int err; 5440 5441 expr = nft_expr_init(ctx, attr); 5442 if (IS_ERR(expr)) 5443 return expr; 5444 5445 err = -EOPNOTSUPP; 5446 if (expr->ops->type->flags & NFT_EXPR_GC) { 5447 if (set->flags & NFT_SET_TIMEOUT) 5448 goto err_set_elem_expr; 5449 if (!set->ops->gc_init) 5450 goto err_set_elem_expr; 5451 set->ops->gc_init(set); 5452 } 5453 5454 return expr; 5455 5456 err_set_elem_expr: 5457 nft_expr_destroy(ctx, expr); 5458 return ERR_PTR(err); 5459 } 5460 5461 void *nft_set_elem_init(const struct nft_set *set, 5462 const struct nft_set_ext_tmpl *tmpl, 5463 const u32 *key, const u32 *key_end, 5464 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp) 5465 { 5466 struct nft_set_ext *ext; 5467 void *elem; 5468 5469 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); 5470 if (elem == NULL) 5471 return NULL; 5472 5473 ext = nft_set_elem_ext(set, elem); 5474 nft_set_ext_init(ext, tmpl); 5475 5476 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY)) 5477 memcpy(nft_set_ext_key(ext), key, set->klen); 5478 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END)) 5479 memcpy(nft_set_ext_key_end(ext), key_end, set->klen); 5480 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 5481 memcpy(nft_set_ext_data(ext), data, set->dlen); 5482 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { 5483 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration; 5484 if (expiration == 0) 5485 *nft_set_ext_expiration(ext) += timeout; 5486 } 5487 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) 5488 *nft_set_ext_timeout(ext) = timeout; 5489 5490 return elem; 5491 } 5492 5493 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx, 5494 struct nft_expr *expr) 5495 { 5496 if (expr->ops->destroy_clone) { 5497 expr->ops->destroy_clone(ctx, expr); 5498 module_put(expr->ops->type->owner); 5499 } else { 5500 nf_tables_expr_destroy(ctx, expr); 5501 } 5502 } 5503 5504 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, 5505 struct nft_set_elem_expr *elem_expr) 5506 { 5507 struct nft_expr *expr; 5508 u32 size; 5509 5510 nft_setelem_expr_foreach(expr, elem_expr, size) 5511 __nft_set_elem_expr_destroy(ctx, expr); 5512 } 5513 5514 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 5515 bool destroy_expr) 5516 { 5517 struct nft_set_ext *ext = nft_set_elem_ext(set, elem); 5518 struct nft_ctx ctx = { 5519 .net = read_pnet(&set->net), 5520 .family = set->table->family, 5521 }; 5522 5523 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); 5524 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 5525 nft_data_release(nft_set_ext_data(ext), set->dtype); 5526 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) 5527 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext)); 5528 5529 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 5530 (*nft_set_ext_obj(ext))->use--; 5531 kfree(elem); 5532 } 5533 EXPORT_SYMBOL_GPL(nft_set_elem_destroy); 5534 5535 /* Only called from commit path, nft_setelem_data_deactivate() already deals 5536 * with the refcounting from the preparation phase. 5537 */ 5538 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, 5539 const struct nft_set *set, void *elem) 5540 { 5541 struct nft_set_ext *ext = nft_set_elem_ext(set, elem); 5542 5543 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) 5544 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext)); 5545 5546 kfree(elem); 5547 } 5548 5549 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 5550 struct nft_expr *expr_array[]) 5551 { 5552 struct nft_expr *expr; 5553 int err, i, k; 5554 5555 for (i = 0; i < set->num_exprs; i++) { 5556 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT); 5557 if (!expr) 5558 goto err_expr; 5559 5560 err = nft_expr_clone(expr, set->exprs[i]); 5561 if (err < 0) { 5562 nft_expr_destroy(ctx, expr); 5563 goto err_expr; 5564 } 5565 expr_array[i] = expr; 5566 } 5567 5568 return 0; 5569 5570 err_expr: 5571 for (k = i - 1; k >= 0; k--) 5572 nft_expr_destroy(ctx, expr_array[k]); 5573 5574 return -ENOMEM; 5575 } 5576 5577 static int nft_set_elem_expr_setup(struct nft_ctx *ctx, 5578 const struct nft_set_ext *ext, 5579 struct nft_expr *expr_array[], 5580 u32 num_exprs) 5581 { 5582 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext); 5583 struct nft_expr *expr; 5584 int i, err; 5585 5586 for (i = 0; i < num_exprs; i++) { 5587 expr = nft_setelem_expr_at(elem_expr, elem_expr->size); 5588 err = nft_expr_clone(expr, expr_array[i]); 5589 if (err < 0) 5590 goto err_elem_expr_setup; 5591 5592 elem_expr->size += expr_array[i]->ops->size; 5593 nft_expr_destroy(ctx, expr_array[i]); 5594 expr_array[i] = NULL; 5595 } 5596 5597 return 0; 5598 5599 err_elem_expr_setup: 5600 for (; i < num_exprs; i++) { 5601 nft_expr_destroy(ctx, expr_array[i]); 5602 expr_array[i] = NULL; 5603 } 5604 5605 return -ENOMEM; 5606 } 5607 5608 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 5609 const struct nft_set *set) 5610 { 5611 struct nft_set_elem_catchall *catchall; 5612 u8 genmask = nft_genmask_cur(net); 5613 struct nft_set_ext *ext; 5614 5615 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5616 ext = nft_set_elem_ext(set, catchall->elem); 5617 if (nft_set_elem_active(ext, genmask) && 5618 !nft_set_elem_expired(ext)) 5619 return ext; 5620 } 5621 5622 return NULL; 5623 } 5624 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup); 5625 5626 void *nft_set_catchall_gc(const struct nft_set *set) 5627 { 5628 struct nft_set_elem_catchall *catchall, *next; 5629 struct nft_set_ext *ext; 5630 void *elem = NULL; 5631 5632 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 5633 ext = nft_set_elem_ext(set, catchall->elem); 5634 5635 if (!nft_set_elem_expired(ext) || 5636 nft_set_elem_mark_busy(ext)) 5637 continue; 5638 5639 elem = catchall->elem; 5640 list_del_rcu(&catchall->list); 5641 kfree_rcu(catchall, rcu); 5642 break; 5643 } 5644 5645 return elem; 5646 } 5647 EXPORT_SYMBOL_GPL(nft_set_catchall_gc); 5648 5649 static int nft_setelem_catchall_insert(const struct net *net, 5650 struct nft_set *set, 5651 const struct nft_set_elem *elem, 5652 struct nft_set_ext **pext) 5653 { 5654 struct nft_set_elem_catchall *catchall; 5655 u8 genmask = nft_genmask_next(net); 5656 struct nft_set_ext *ext; 5657 5658 list_for_each_entry(catchall, &set->catchall_list, list) { 5659 ext = nft_set_elem_ext(set, catchall->elem); 5660 if (nft_set_elem_active(ext, genmask)) { 5661 *pext = ext; 5662 return -EEXIST; 5663 } 5664 } 5665 5666 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL); 5667 if (!catchall) 5668 return -ENOMEM; 5669 5670 catchall->elem = elem->priv; 5671 list_add_tail_rcu(&catchall->list, &set->catchall_list); 5672 5673 return 0; 5674 } 5675 5676 static int nft_setelem_insert(const struct net *net, 5677 struct nft_set *set, 5678 const struct nft_set_elem *elem, 5679 struct nft_set_ext **ext, unsigned int flags) 5680 { 5681 int ret; 5682 5683 if (flags & NFT_SET_ELEM_CATCHALL) 5684 ret = nft_setelem_catchall_insert(net, set, elem, ext); 5685 else 5686 ret = set->ops->insert(net, set, elem, ext); 5687 5688 return ret; 5689 } 5690 5691 static bool nft_setelem_is_catchall(const struct nft_set *set, 5692 const struct nft_set_elem *elem) 5693 { 5694 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 5695 5696 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 5697 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL) 5698 return true; 5699 5700 return false; 5701 } 5702 5703 static void nft_setelem_activate(struct net *net, struct nft_set *set, 5704 struct nft_set_elem *elem) 5705 { 5706 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 5707 5708 if (nft_setelem_is_catchall(set, elem)) { 5709 nft_set_elem_change_active(net, set, ext); 5710 nft_set_elem_clear_busy(ext); 5711 } else { 5712 set->ops->activate(net, set, elem); 5713 } 5714 } 5715 5716 static int nft_setelem_catchall_deactivate(const struct net *net, 5717 struct nft_set *set, 5718 struct nft_set_elem *elem) 5719 { 5720 struct nft_set_elem_catchall *catchall; 5721 struct nft_set_ext *ext; 5722 5723 list_for_each_entry(catchall, &set->catchall_list, list) { 5724 ext = nft_set_elem_ext(set, catchall->elem); 5725 if (!nft_is_active(net, ext) || 5726 nft_set_elem_mark_busy(ext)) 5727 continue; 5728 5729 kfree(elem->priv); 5730 elem->priv = catchall->elem; 5731 nft_set_elem_change_active(net, set, ext); 5732 return 0; 5733 } 5734 5735 return -ENOENT; 5736 } 5737 5738 static int __nft_setelem_deactivate(const struct net *net, 5739 struct nft_set *set, 5740 struct nft_set_elem *elem) 5741 { 5742 void *priv; 5743 5744 priv = set->ops->deactivate(net, set, elem); 5745 if (!priv) 5746 return -ENOENT; 5747 5748 kfree(elem->priv); 5749 elem->priv = priv; 5750 set->ndeact++; 5751 5752 return 0; 5753 } 5754 5755 static int nft_setelem_deactivate(const struct net *net, 5756 struct nft_set *set, 5757 struct nft_set_elem *elem, u32 flags) 5758 { 5759 int ret; 5760 5761 if (flags & NFT_SET_ELEM_CATCHALL) 5762 ret = nft_setelem_catchall_deactivate(net, set, elem); 5763 else 5764 ret = __nft_setelem_deactivate(net, set, elem); 5765 5766 return ret; 5767 } 5768 5769 static void nft_setelem_catchall_remove(const struct net *net, 5770 const struct nft_set *set, 5771 const struct nft_set_elem *elem) 5772 { 5773 struct nft_set_elem_catchall *catchall, *next; 5774 5775 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 5776 if (catchall->elem == elem->priv) { 5777 list_del_rcu(&catchall->list); 5778 kfree_rcu(catchall, rcu); 5779 break; 5780 } 5781 } 5782 } 5783 5784 static void nft_setelem_remove(const struct net *net, 5785 const struct nft_set *set, 5786 const struct nft_set_elem *elem) 5787 { 5788 if (nft_setelem_is_catchall(set, elem)) 5789 nft_setelem_catchall_remove(net, set, elem); 5790 else 5791 set->ops->remove(net, set, elem); 5792 } 5793 5794 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, 5795 const struct nlattr *attr, u32 nlmsg_flags) 5796 { 5797 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {}; 5798 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 5799 u8 genmask = nft_genmask_next(ctx->net); 5800 u32 flags = 0, size = 0, num_exprs = 0; 5801 struct nft_set_ext_tmpl tmpl; 5802 struct nft_set_ext *ext, *ext2; 5803 struct nft_set_elem elem; 5804 struct nft_set_binding *binding; 5805 struct nft_object *obj = NULL; 5806 struct nft_userdata *udata; 5807 struct nft_data_desc desc; 5808 enum nft_registers dreg; 5809 struct nft_trans *trans; 5810 u64 timeout; 5811 u64 expiration; 5812 int err, i; 5813 u8 ulen; 5814 5815 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 5816 nft_set_elem_policy, NULL); 5817 if (err < 0) 5818 return err; 5819 5820 nft_set_ext_prepare(&tmpl); 5821 5822 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 5823 if (err < 0) 5824 return err; 5825 5826 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 5827 return -EINVAL; 5828 5829 if (flags != 0) 5830 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); 5831 5832 if (set->flags & NFT_SET_MAP) { 5833 if (nla[NFTA_SET_ELEM_DATA] == NULL && 5834 !(flags & NFT_SET_ELEM_INTERVAL_END)) 5835 return -EINVAL; 5836 } else { 5837 if (nla[NFTA_SET_ELEM_DATA] != NULL) 5838 return -EINVAL; 5839 } 5840 5841 if ((flags & NFT_SET_ELEM_INTERVAL_END) && 5842 (nla[NFTA_SET_ELEM_DATA] || 5843 nla[NFTA_SET_ELEM_OBJREF] || 5844 nla[NFTA_SET_ELEM_TIMEOUT] || 5845 nla[NFTA_SET_ELEM_EXPIRATION] || 5846 nla[NFTA_SET_ELEM_USERDATA] || 5847 nla[NFTA_SET_ELEM_EXPR] || 5848 nla[NFTA_SET_ELEM_EXPRESSIONS])) 5849 return -EINVAL; 5850 5851 timeout = 0; 5852 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { 5853 if (!(set->flags & NFT_SET_TIMEOUT)) 5854 return -EINVAL; 5855 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT], 5856 &timeout); 5857 if (err) 5858 return err; 5859 } else if (set->flags & NFT_SET_TIMEOUT) { 5860 timeout = set->timeout; 5861 } 5862 5863 expiration = 0; 5864 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) { 5865 if (!(set->flags & NFT_SET_TIMEOUT)) 5866 return -EINVAL; 5867 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION], 5868 &expiration); 5869 if (err) 5870 return err; 5871 } 5872 5873 if (nla[NFTA_SET_ELEM_EXPR]) { 5874 struct nft_expr *expr; 5875 5876 if (set->num_exprs && set->num_exprs != 1) 5877 return -EOPNOTSUPP; 5878 5879 expr = nft_set_elem_expr_alloc(ctx, set, 5880 nla[NFTA_SET_ELEM_EXPR]); 5881 if (IS_ERR(expr)) 5882 return PTR_ERR(expr); 5883 5884 expr_array[0] = expr; 5885 num_exprs = 1; 5886 5887 if (set->num_exprs && set->exprs[0]->ops != expr->ops) { 5888 err = -EOPNOTSUPP; 5889 goto err_set_elem_expr; 5890 } 5891 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) { 5892 struct nft_expr *expr; 5893 struct nlattr *tmp; 5894 int left; 5895 5896 i = 0; 5897 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) { 5898 if (i == NFT_SET_EXPR_MAX || 5899 (set->num_exprs && set->num_exprs == i)) { 5900 err = -E2BIG; 5901 goto err_set_elem_expr; 5902 } 5903 if (nla_type(tmp) != NFTA_LIST_ELEM) { 5904 err = -EINVAL; 5905 goto err_set_elem_expr; 5906 } 5907 expr = nft_set_elem_expr_alloc(ctx, set, tmp); 5908 if (IS_ERR(expr)) { 5909 err = PTR_ERR(expr); 5910 goto err_set_elem_expr; 5911 } 5912 expr_array[i] = expr; 5913 num_exprs++; 5914 5915 if (set->num_exprs && expr->ops != set->exprs[i]->ops) { 5916 err = -EOPNOTSUPP; 5917 goto err_set_elem_expr; 5918 } 5919 i++; 5920 } 5921 if (set->num_exprs && set->num_exprs != i) { 5922 err = -EOPNOTSUPP; 5923 goto err_set_elem_expr; 5924 } 5925 } else if (set->num_exprs > 0) { 5926 err = nft_set_elem_expr_clone(ctx, set, expr_array); 5927 if (err < 0) 5928 goto err_set_elem_expr_clone; 5929 5930 num_exprs = set->num_exprs; 5931 } 5932 5933 if (nla[NFTA_SET_ELEM_KEY]) { 5934 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 5935 nla[NFTA_SET_ELEM_KEY]); 5936 if (err < 0) 5937 goto err_set_elem_expr; 5938 5939 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen); 5940 } 5941 5942 if (nla[NFTA_SET_ELEM_KEY_END]) { 5943 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 5944 nla[NFTA_SET_ELEM_KEY_END]); 5945 if (err < 0) 5946 goto err_parse_key; 5947 5948 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen); 5949 } 5950 5951 if (timeout > 0) { 5952 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); 5953 if (timeout != set->timeout) 5954 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); 5955 } 5956 5957 if (num_exprs) { 5958 for (i = 0; i < num_exprs; i++) 5959 size += expr_array[i]->ops->size; 5960 5961 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS, 5962 sizeof(struct nft_set_elem_expr) + 5963 size); 5964 } 5965 5966 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { 5967 if (!(set->flags & NFT_SET_OBJECT)) { 5968 err = -EINVAL; 5969 goto err_parse_key_end; 5970 } 5971 obj = nft_obj_lookup(ctx->net, ctx->table, 5972 nla[NFTA_SET_ELEM_OBJREF], 5973 set->objtype, genmask); 5974 if (IS_ERR(obj)) { 5975 err = PTR_ERR(obj); 5976 goto err_parse_key_end; 5977 } 5978 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); 5979 } 5980 5981 if (nla[NFTA_SET_ELEM_DATA] != NULL) { 5982 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val, 5983 nla[NFTA_SET_ELEM_DATA]); 5984 if (err < 0) 5985 goto err_parse_key_end; 5986 5987 dreg = nft_type_to_reg(set->dtype); 5988 list_for_each_entry(binding, &set->bindings, list) { 5989 struct nft_ctx bind_ctx = { 5990 .net = ctx->net, 5991 .family = ctx->family, 5992 .table = ctx->table, 5993 .chain = (struct nft_chain *)binding->chain, 5994 }; 5995 5996 if (!(binding->flags & NFT_SET_MAP)) 5997 continue; 5998 5999 err = nft_validate_register_store(&bind_ctx, dreg, 6000 &elem.data.val, 6001 desc.type, desc.len); 6002 if (err < 0) 6003 goto err_parse_data; 6004 6005 if (desc.type == NFT_DATA_VERDICT && 6006 (elem.data.val.verdict.code == NFT_GOTO || 6007 elem.data.val.verdict.code == NFT_JUMP)) 6008 nft_validate_state_update(ctx->net, 6009 NFT_VALIDATE_NEED); 6010 } 6011 6012 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len); 6013 } 6014 6015 /* The full maximum length of userdata can exceed the maximum 6016 * offset value (U8_MAX) for following extensions, therefor it 6017 * must be the last extension added. 6018 */ 6019 ulen = 0; 6020 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { 6021 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); 6022 if (ulen > 0) 6023 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, 6024 ulen); 6025 } 6026 6027 err = -ENOMEM; 6028 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, 6029 elem.key_end.val.data, elem.data.val.data, 6030 timeout, expiration, GFP_KERNEL_ACCOUNT); 6031 if (elem.priv == NULL) 6032 goto err_parse_data; 6033 6034 ext = nft_set_elem_ext(set, elem.priv); 6035 if (flags) 6036 *nft_set_ext_flags(ext) = flags; 6037 if (ulen > 0) { 6038 udata = nft_set_ext_userdata(ext); 6039 udata->len = ulen - 1; 6040 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); 6041 } 6042 if (obj) { 6043 *nft_set_ext_obj(ext) = obj; 6044 obj->use++; 6045 } 6046 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs); 6047 if (err < 0) 6048 goto err_elem_expr; 6049 6050 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); 6051 if (trans == NULL) { 6052 err = -ENOMEM; 6053 goto err_elem_expr; 6054 } 6055 6056 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; 6057 6058 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags); 6059 if (err) { 6060 if (err == -EEXIST) { 6061 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ 6062 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || 6063 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ 6064 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) 6065 goto err_element_clash; 6066 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 6067 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && 6068 memcmp(nft_set_ext_data(ext), 6069 nft_set_ext_data(ext2), set->dlen) != 0) || 6070 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && 6071 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && 6072 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) 6073 goto err_element_clash; 6074 else if (!(nlmsg_flags & NLM_F_EXCL)) 6075 err = 0; 6076 } else if (err == -ENOTEMPTY) { 6077 /* ENOTEMPTY reports overlapping between this element 6078 * and an existing one. 6079 */ 6080 err = -EEXIST; 6081 } 6082 goto err_element_clash; 6083 } 6084 6085 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size && 6086 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { 6087 err = -ENFILE; 6088 goto err_set_full; 6089 } 6090 6091 nft_trans_elem(trans) = elem; 6092 nft_trans_commit_list_add_tail(ctx->net, trans); 6093 return 0; 6094 6095 err_set_full: 6096 nft_setelem_remove(ctx->net, set, &elem); 6097 err_element_clash: 6098 kfree(trans); 6099 err_elem_expr: 6100 if (obj) 6101 obj->use--; 6102 6103 nf_tables_set_elem_destroy(ctx, set, elem.priv); 6104 err_parse_data: 6105 if (nla[NFTA_SET_ELEM_DATA] != NULL) 6106 nft_data_release(&elem.data.val, desc.type); 6107 err_parse_key_end: 6108 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE); 6109 err_parse_key: 6110 nft_data_release(&elem.key.val, NFT_DATA_VALUE); 6111 err_set_elem_expr: 6112 for (i = 0; i < num_exprs && expr_array[i]; i++) 6113 nft_expr_destroy(ctx, expr_array[i]); 6114 err_set_elem_expr_clone: 6115 return err; 6116 } 6117 6118 static int nf_tables_newsetelem(struct sk_buff *skb, 6119 const struct nfnl_info *info, 6120 const struct nlattr * const nla[]) 6121 { 6122 struct nftables_pernet *nft_net = nft_pernet(info->net); 6123 struct netlink_ext_ack *extack = info->extack; 6124 u8 genmask = nft_genmask_next(info->net); 6125 u8 family = info->nfmsg->nfgen_family; 6126 struct net *net = info->net; 6127 const struct nlattr *attr; 6128 struct nft_table *table; 6129 struct nft_set *set; 6130 struct nft_ctx ctx; 6131 int rem, err; 6132 6133 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) 6134 return -EINVAL; 6135 6136 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 6137 genmask, NETLINK_CB(skb).portid); 6138 if (IS_ERR(table)) { 6139 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 6140 return PTR_ERR(table); 6141 } 6142 6143 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET], 6144 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask); 6145 if (IS_ERR(set)) 6146 return PTR_ERR(set); 6147 6148 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) 6149 return -EBUSY; 6150 6151 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6152 6153 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 6154 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags); 6155 if (err < 0) { 6156 NL_SET_BAD_ATTR(extack, attr); 6157 return err; 6158 } 6159 } 6160 6161 if (nft_net->validate_state == NFT_VALIDATE_DO) 6162 return nft_table_validate(net, table); 6163 6164 return 0; 6165 } 6166 6167 /** 6168 * nft_data_hold - hold a nft_data item 6169 * 6170 * @data: struct nft_data to release 6171 * @type: type of data 6172 * 6173 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, 6174 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and 6175 * NFT_GOTO verdicts. This function must be called on active data objects 6176 * from the second phase of the commit protocol. 6177 */ 6178 void nft_data_hold(const struct nft_data *data, enum nft_data_types type) 6179 { 6180 struct nft_chain *chain; 6181 struct nft_rule *rule; 6182 6183 if (type == NFT_DATA_VERDICT) { 6184 switch (data->verdict.code) { 6185 case NFT_JUMP: 6186 case NFT_GOTO: 6187 chain = data->verdict.chain; 6188 chain->use++; 6189 6190 if (!nft_chain_is_bound(chain)) 6191 break; 6192 6193 chain->table->use++; 6194 list_for_each_entry(rule, &chain->rules, list) 6195 chain->use++; 6196 6197 nft_chain_add(chain->table, chain); 6198 break; 6199 } 6200 } 6201 } 6202 6203 static void nft_setelem_data_activate(const struct net *net, 6204 const struct nft_set *set, 6205 struct nft_set_elem *elem) 6206 { 6207 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 6208 6209 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 6210 nft_data_hold(nft_set_ext_data(ext), set->dtype); 6211 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 6212 (*nft_set_ext_obj(ext))->use++; 6213 } 6214 6215 static void nft_setelem_data_deactivate(const struct net *net, 6216 const struct nft_set *set, 6217 struct nft_set_elem *elem) 6218 { 6219 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 6220 6221 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 6222 nft_data_release(nft_set_ext_data(ext), set->dtype); 6223 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 6224 (*nft_set_ext_obj(ext))->use--; 6225 } 6226 6227 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, 6228 const struct nlattr *attr) 6229 { 6230 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 6231 struct nft_set_ext_tmpl tmpl; 6232 struct nft_set_elem elem; 6233 struct nft_set_ext *ext; 6234 struct nft_trans *trans; 6235 u32 flags = 0; 6236 int err; 6237 6238 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 6239 nft_set_elem_policy, NULL); 6240 if (err < 0) 6241 return err; 6242 6243 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 6244 if (err < 0) 6245 return err; 6246 6247 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 6248 return -EINVAL; 6249 6250 nft_set_ext_prepare(&tmpl); 6251 6252 if (flags != 0) 6253 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); 6254 6255 if (nla[NFTA_SET_ELEM_KEY]) { 6256 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 6257 nla[NFTA_SET_ELEM_KEY]); 6258 if (err < 0) 6259 return err; 6260 6261 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen); 6262 } 6263 6264 if (nla[NFTA_SET_ELEM_KEY_END]) { 6265 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 6266 nla[NFTA_SET_ELEM_KEY_END]); 6267 if (err < 0) 6268 return err; 6269 6270 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen); 6271 } 6272 6273 err = -ENOMEM; 6274 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, 6275 elem.key_end.val.data, NULL, 0, 0, 6276 GFP_KERNEL_ACCOUNT); 6277 if (elem.priv == NULL) 6278 goto fail_elem; 6279 6280 ext = nft_set_elem_ext(set, elem.priv); 6281 if (flags) 6282 *nft_set_ext_flags(ext) = flags; 6283 6284 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); 6285 if (trans == NULL) 6286 goto fail_trans; 6287 6288 err = nft_setelem_deactivate(ctx->net, set, &elem, flags); 6289 if (err < 0) 6290 goto fail_ops; 6291 6292 nft_setelem_data_deactivate(ctx->net, set, &elem); 6293 6294 nft_trans_elem(trans) = elem; 6295 nft_trans_commit_list_add_tail(ctx->net, trans); 6296 return 0; 6297 6298 fail_ops: 6299 kfree(trans); 6300 fail_trans: 6301 kfree(elem.priv); 6302 fail_elem: 6303 nft_data_release(&elem.key.val, NFT_DATA_VALUE); 6304 return err; 6305 } 6306 6307 static int nft_setelem_flush(const struct nft_ctx *ctx, 6308 struct nft_set *set, 6309 const struct nft_set_iter *iter, 6310 struct nft_set_elem *elem) 6311 { 6312 struct nft_trans *trans; 6313 int err; 6314 6315 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, 6316 sizeof(struct nft_trans_elem), GFP_ATOMIC); 6317 if (!trans) 6318 return -ENOMEM; 6319 6320 if (!set->ops->flush(ctx->net, set, elem->priv)) { 6321 err = -ENOENT; 6322 goto err1; 6323 } 6324 set->ndeact++; 6325 6326 nft_setelem_data_deactivate(ctx->net, set, elem); 6327 nft_trans_elem_set(trans) = set; 6328 nft_trans_elem(trans) = *elem; 6329 nft_trans_commit_list_add_tail(ctx->net, trans); 6330 6331 return 0; 6332 err1: 6333 kfree(trans); 6334 return err; 6335 } 6336 6337 static int __nft_set_catchall_flush(const struct nft_ctx *ctx, 6338 struct nft_set *set, 6339 struct nft_set_elem *elem) 6340 { 6341 struct nft_trans *trans; 6342 6343 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, 6344 sizeof(struct nft_trans_elem), GFP_KERNEL); 6345 if (!trans) 6346 return -ENOMEM; 6347 6348 nft_setelem_data_deactivate(ctx->net, set, elem); 6349 nft_trans_elem_set(trans) = set; 6350 nft_trans_elem(trans) = *elem; 6351 nft_trans_commit_list_add_tail(ctx->net, trans); 6352 6353 return 0; 6354 } 6355 6356 static int nft_set_catchall_flush(const struct nft_ctx *ctx, 6357 struct nft_set *set) 6358 { 6359 u8 genmask = nft_genmask_next(ctx->net); 6360 struct nft_set_elem_catchall *catchall; 6361 struct nft_set_elem elem; 6362 struct nft_set_ext *ext; 6363 int ret = 0; 6364 6365 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 6366 ext = nft_set_elem_ext(set, catchall->elem); 6367 if (!nft_set_elem_active(ext, genmask) || 6368 nft_set_elem_mark_busy(ext)) 6369 continue; 6370 6371 elem.priv = catchall->elem; 6372 ret = __nft_set_catchall_flush(ctx, set, &elem); 6373 if (ret < 0) 6374 break; 6375 } 6376 6377 return ret; 6378 } 6379 6380 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask) 6381 { 6382 struct nft_set_iter iter = { 6383 .genmask = genmask, 6384 .fn = nft_setelem_flush, 6385 }; 6386 6387 set->ops->walk(ctx, set, &iter); 6388 if (!iter.err) 6389 iter.err = nft_set_catchall_flush(ctx, set); 6390 6391 return iter.err; 6392 } 6393 6394 static int nf_tables_delsetelem(struct sk_buff *skb, 6395 const struct nfnl_info *info, 6396 const struct nlattr * const nla[]) 6397 { 6398 struct netlink_ext_ack *extack = info->extack; 6399 u8 genmask = nft_genmask_next(info->net); 6400 u8 family = info->nfmsg->nfgen_family; 6401 struct net *net = info->net; 6402 const struct nlattr *attr; 6403 struct nft_table *table; 6404 struct nft_set *set; 6405 struct nft_ctx ctx; 6406 int rem, err = 0; 6407 6408 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 6409 genmask, NETLINK_CB(skb).portid); 6410 if (IS_ERR(table)) { 6411 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 6412 return PTR_ERR(table); 6413 } 6414 6415 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask); 6416 if (IS_ERR(set)) 6417 return PTR_ERR(set); 6418 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) 6419 return -EBUSY; 6420 6421 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6422 6423 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) 6424 return nft_set_flush(&ctx, set, genmask); 6425 6426 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 6427 err = nft_del_setelem(&ctx, set, attr); 6428 if (err < 0) { 6429 NL_SET_BAD_ATTR(extack, attr); 6430 break; 6431 } 6432 } 6433 return err; 6434 } 6435 6436 void nft_set_gc_batch_release(struct rcu_head *rcu) 6437 { 6438 struct nft_set_gc_batch *gcb; 6439 unsigned int i; 6440 6441 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); 6442 for (i = 0; i < gcb->head.cnt; i++) 6443 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); 6444 kfree(gcb); 6445 } 6446 6447 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 6448 gfp_t gfp) 6449 { 6450 struct nft_set_gc_batch *gcb; 6451 6452 gcb = kzalloc(sizeof(*gcb), gfp); 6453 if (gcb == NULL) 6454 return gcb; 6455 gcb->head.set = set; 6456 return gcb; 6457 } 6458 6459 /* 6460 * Stateful objects 6461 */ 6462 6463 /** 6464 * nft_register_obj- register nf_tables stateful object type 6465 * @obj_type: object type 6466 * 6467 * Registers the object type for use with nf_tables. Returns zero on 6468 * success or a negative errno code otherwise. 6469 */ 6470 int nft_register_obj(struct nft_object_type *obj_type) 6471 { 6472 if (obj_type->type == NFT_OBJECT_UNSPEC) 6473 return -EINVAL; 6474 6475 nfnl_lock(NFNL_SUBSYS_NFTABLES); 6476 list_add_rcu(&obj_type->list, &nf_tables_objects); 6477 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 6478 return 0; 6479 } 6480 EXPORT_SYMBOL_GPL(nft_register_obj); 6481 6482 /** 6483 * nft_unregister_obj - unregister nf_tables object type 6484 * @obj_type: object type 6485 * 6486 * Unregisters the object type for use with nf_tables. 6487 */ 6488 void nft_unregister_obj(struct nft_object_type *obj_type) 6489 { 6490 nfnl_lock(NFNL_SUBSYS_NFTABLES); 6491 list_del_rcu(&obj_type->list); 6492 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 6493 } 6494 EXPORT_SYMBOL_GPL(nft_unregister_obj); 6495 6496 struct nft_object *nft_obj_lookup(const struct net *net, 6497 const struct nft_table *table, 6498 const struct nlattr *nla, u32 objtype, 6499 u8 genmask) 6500 { 6501 struct nft_object_hash_key k = { .table = table }; 6502 char search[NFT_OBJ_MAXNAMELEN]; 6503 struct rhlist_head *tmp, *list; 6504 struct nft_object *obj; 6505 6506 nla_strscpy(search, nla, sizeof(search)); 6507 k.name = search; 6508 6509 WARN_ON_ONCE(!rcu_read_lock_held() && 6510 !lockdep_commit_lock_is_held(net)); 6511 6512 rcu_read_lock(); 6513 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params); 6514 if (!list) 6515 goto out; 6516 6517 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) { 6518 if (objtype == obj->ops->type->type && 6519 nft_active_genmask(obj, genmask)) { 6520 rcu_read_unlock(); 6521 return obj; 6522 } 6523 } 6524 out: 6525 rcu_read_unlock(); 6526 return ERR_PTR(-ENOENT); 6527 } 6528 EXPORT_SYMBOL_GPL(nft_obj_lookup); 6529 6530 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table, 6531 const struct nlattr *nla, 6532 u32 objtype, u8 genmask) 6533 { 6534 struct nft_object *obj; 6535 6536 list_for_each_entry(obj, &table->objects, list) { 6537 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle && 6538 objtype == obj->ops->type->type && 6539 nft_active_genmask(obj, genmask)) 6540 return obj; 6541 } 6542 return ERR_PTR(-ENOENT); 6543 } 6544 6545 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { 6546 [NFTA_OBJ_TABLE] = { .type = NLA_STRING, 6547 .len = NFT_TABLE_MAXNAMELEN - 1 }, 6548 [NFTA_OBJ_NAME] = { .type = NLA_STRING, 6549 .len = NFT_OBJ_MAXNAMELEN - 1 }, 6550 [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, 6551 [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, 6552 [NFTA_OBJ_HANDLE] = { .type = NLA_U64}, 6553 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY, 6554 .len = NFT_USERDATA_MAXLEN }, 6555 }; 6556 6557 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, 6558 const struct nft_object_type *type, 6559 const struct nlattr *attr) 6560 { 6561 struct nlattr **tb; 6562 const struct nft_object_ops *ops; 6563 struct nft_object *obj; 6564 int err = -ENOMEM; 6565 6566 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL); 6567 if (!tb) 6568 goto err1; 6569 6570 if (attr) { 6571 err = nla_parse_nested_deprecated(tb, type->maxattr, attr, 6572 type->policy, NULL); 6573 if (err < 0) 6574 goto err2; 6575 } else { 6576 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); 6577 } 6578 6579 if (type->select_ops) { 6580 ops = type->select_ops(ctx, (const struct nlattr * const *)tb); 6581 if (IS_ERR(ops)) { 6582 err = PTR_ERR(ops); 6583 goto err2; 6584 } 6585 } else { 6586 ops = type->ops; 6587 } 6588 6589 err = -ENOMEM; 6590 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT); 6591 if (!obj) 6592 goto err2; 6593 6594 err = ops->init(ctx, (const struct nlattr * const *)tb, obj); 6595 if (err < 0) 6596 goto err3; 6597 6598 obj->ops = ops; 6599 6600 kfree(tb); 6601 return obj; 6602 err3: 6603 kfree(obj); 6604 err2: 6605 kfree(tb); 6606 err1: 6607 return ERR_PTR(err); 6608 } 6609 6610 static int nft_object_dump(struct sk_buff *skb, unsigned int attr, 6611 struct nft_object *obj, bool reset) 6612 { 6613 struct nlattr *nest; 6614 6615 nest = nla_nest_start_noflag(skb, attr); 6616 if (!nest) 6617 goto nla_put_failure; 6618 if (obj->ops->dump(skb, obj, reset) < 0) 6619 goto nla_put_failure; 6620 nla_nest_end(skb, nest); 6621 return 0; 6622 6623 nla_put_failure: 6624 return -1; 6625 } 6626 6627 static const struct nft_object_type *__nft_obj_type_get(u32 objtype) 6628 { 6629 const struct nft_object_type *type; 6630 6631 list_for_each_entry(type, &nf_tables_objects, list) { 6632 if (objtype == type->type) 6633 return type; 6634 } 6635 return NULL; 6636 } 6637 6638 static const struct nft_object_type * 6639 nft_obj_type_get(struct net *net, u32 objtype) 6640 { 6641 const struct nft_object_type *type; 6642 6643 type = __nft_obj_type_get(objtype); 6644 if (type != NULL && try_module_get(type->owner)) 6645 return type; 6646 6647 lockdep_nfnl_nft_mutex_not_held(); 6648 #ifdef CONFIG_MODULES 6649 if (type == NULL) { 6650 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN) 6651 return ERR_PTR(-EAGAIN); 6652 } 6653 #endif 6654 return ERR_PTR(-ENOENT); 6655 } 6656 6657 static int nf_tables_updobj(const struct nft_ctx *ctx, 6658 const struct nft_object_type *type, 6659 const struct nlattr *attr, 6660 struct nft_object *obj) 6661 { 6662 struct nft_object *newobj; 6663 struct nft_trans *trans; 6664 int err = -ENOMEM; 6665 6666 if (!try_module_get(type->owner)) 6667 return -ENOENT; 6668 6669 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ, 6670 sizeof(struct nft_trans_obj)); 6671 if (!trans) 6672 goto err_trans; 6673 6674 newobj = nft_obj_init(ctx, type, attr); 6675 if (IS_ERR(newobj)) { 6676 err = PTR_ERR(newobj); 6677 goto err_free_trans; 6678 } 6679 6680 nft_trans_obj(trans) = obj; 6681 nft_trans_obj_update(trans) = true; 6682 nft_trans_obj_newobj(trans) = newobj; 6683 nft_trans_commit_list_add_tail(ctx->net, trans); 6684 6685 return 0; 6686 6687 err_free_trans: 6688 kfree(trans); 6689 err_trans: 6690 module_put(type->owner); 6691 return err; 6692 } 6693 6694 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info, 6695 const struct nlattr * const nla[]) 6696 { 6697 struct netlink_ext_ack *extack = info->extack; 6698 u8 genmask = nft_genmask_next(info->net); 6699 u8 family = info->nfmsg->nfgen_family; 6700 const struct nft_object_type *type; 6701 struct net *net = info->net; 6702 struct nft_table *table; 6703 struct nft_object *obj; 6704 struct nft_ctx ctx; 6705 u32 objtype; 6706 int err; 6707 6708 if (!nla[NFTA_OBJ_TYPE] || 6709 !nla[NFTA_OBJ_NAME] || 6710 !nla[NFTA_OBJ_DATA]) 6711 return -EINVAL; 6712 6713 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 6714 NETLINK_CB(skb).portid); 6715 if (IS_ERR(table)) { 6716 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 6717 return PTR_ERR(table); 6718 } 6719 6720 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6721 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask); 6722 if (IS_ERR(obj)) { 6723 err = PTR_ERR(obj); 6724 if (err != -ENOENT) { 6725 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6726 return err; 6727 } 6728 } else { 6729 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 6730 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6731 return -EEXIST; 6732 } 6733 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 6734 return -EOPNOTSUPP; 6735 6736 type = __nft_obj_type_get(objtype); 6737 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6738 6739 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj); 6740 } 6741 6742 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6743 6744 type = nft_obj_type_get(net, objtype); 6745 if (IS_ERR(type)) 6746 return PTR_ERR(type); 6747 6748 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); 6749 if (IS_ERR(obj)) { 6750 err = PTR_ERR(obj); 6751 goto err_init; 6752 } 6753 obj->key.table = table; 6754 obj->handle = nf_tables_alloc_handle(table); 6755 6756 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT); 6757 if (!obj->key.name) { 6758 err = -ENOMEM; 6759 goto err_strdup; 6760 } 6761 6762 if (nla[NFTA_OBJ_USERDATA]) { 6763 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL); 6764 if (obj->udata == NULL) 6765 goto err_userdata; 6766 6767 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]); 6768 } 6769 6770 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); 6771 if (err < 0) 6772 goto err_trans; 6773 6774 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead, 6775 nft_objname_ht_params); 6776 if (err < 0) 6777 goto err_obj_ht; 6778 6779 list_add_tail_rcu(&obj->list, &table->objects); 6780 table->use++; 6781 return 0; 6782 err_obj_ht: 6783 /* queued in transaction log */ 6784 INIT_LIST_HEAD(&obj->list); 6785 return err; 6786 err_trans: 6787 kfree(obj->udata); 6788 err_userdata: 6789 kfree(obj->key.name); 6790 err_strdup: 6791 if (obj->ops->destroy) 6792 obj->ops->destroy(&ctx, obj); 6793 kfree(obj); 6794 err_init: 6795 module_put(type->owner); 6796 return err; 6797 } 6798 6799 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, 6800 u32 portid, u32 seq, int event, u32 flags, 6801 int family, const struct nft_table *table, 6802 struct nft_object *obj, bool reset) 6803 { 6804 struct nlmsghdr *nlh; 6805 6806 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 6807 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 6808 NFNETLINK_V0, nft_base_seq(net)); 6809 if (!nlh) 6810 goto nla_put_failure; 6811 6812 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || 6813 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) || 6814 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || 6815 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || 6816 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) || 6817 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle), 6818 NFTA_OBJ_PAD)) 6819 goto nla_put_failure; 6820 6821 if (obj->udata && 6822 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata)) 6823 goto nla_put_failure; 6824 6825 nlmsg_end(skb, nlh); 6826 return 0; 6827 6828 nla_put_failure: 6829 nlmsg_trim(skb, nlh); 6830 return -1; 6831 } 6832 6833 struct nft_obj_filter { 6834 char *table; 6835 u32 type; 6836 }; 6837 6838 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) 6839 { 6840 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 6841 const struct nft_table *table; 6842 unsigned int idx = 0, s_idx = cb->args[0]; 6843 struct nft_obj_filter *filter = cb->data; 6844 struct net *net = sock_net(skb->sk); 6845 int family = nfmsg->nfgen_family; 6846 struct nftables_pernet *nft_net; 6847 struct nft_object *obj; 6848 bool reset = false; 6849 6850 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) 6851 reset = true; 6852 6853 rcu_read_lock(); 6854 nft_net = nft_pernet(net); 6855 cb->seq = nft_net->base_seq; 6856 6857 list_for_each_entry_rcu(table, &nft_net->tables, list) { 6858 if (family != NFPROTO_UNSPEC && family != table->family) 6859 continue; 6860 6861 list_for_each_entry_rcu(obj, &table->objects, list) { 6862 if (!nft_is_active(net, obj)) 6863 goto cont; 6864 if (idx < s_idx) 6865 goto cont; 6866 if (idx > s_idx) 6867 memset(&cb->args[1], 0, 6868 sizeof(cb->args) - sizeof(cb->args[0])); 6869 if (filter && filter->table && 6870 strcmp(filter->table, table->name)) 6871 goto cont; 6872 if (filter && 6873 filter->type != NFT_OBJECT_UNSPEC && 6874 obj->ops->type->type != filter->type) 6875 goto cont; 6876 if (reset) { 6877 char *buf = kasprintf(GFP_ATOMIC, 6878 "%s:%u", 6879 table->name, 6880 nft_net->base_seq); 6881 6882 audit_log_nfcfg(buf, 6883 family, 6884 obj->handle, 6885 AUDIT_NFT_OP_OBJ_RESET, 6886 GFP_ATOMIC); 6887 kfree(buf); 6888 } 6889 6890 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, 6891 cb->nlh->nlmsg_seq, 6892 NFT_MSG_NEWOBJ, 6893 NLM_F_MULTI | NLM_F_APPEND, 6894 table->family, table, 6895 obj, reset) < 0) 6896 goto done; 6897 6898 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 6899 cont: 6900 idx++; 6901 } 6902 } 6903 done: 6904 rcu_read_unlock(); 6905 6906 cb->args[0] = idx; 6907 return skb->len; 6908 } 6909 6910 static int nf_tables_dump_obj_start(struct netlink_callback *cb) 6911 { 6912 const struct nlattr * const *nla = cb->data; 6913 struct nft_obj_filter *filter = NULL; 6914 6915 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) { 6916 filter = kzalloc(sizeof(*filter), GFP_ATOMIC); 6917 if (!filter) 6918 return -ENOMEM; 6919 6920 if (nla[NFTA_OBJ_TABLE]) { 6921 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC); 6922 if (!filter->table) { 6923 kfree(filter); 6924 return -ENOMEM; 6925 } 6926 } 6927 6928 if (nla[NFTA_OBJ_TYPE]) 6929 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6930 } 6931 6932 cb->data = filter; 6933 return 0; 6934 } 6935 6936 static int nf_tables_dump_obj_done(struct netlink_callback *cb) 6937 { 6938 struct nft_obj_filter *filter = cb->data; 6939 6940 if (filter) { 6941 kfree(filter->table); 6942 kfree(filter); 6943 } 6944 6945 return 0; 6946 } 6947 6948 /* called with rcu_read_lock held */ 6949 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info, 6950 const struct nlattr * const nla[]) 6951 { 6952 struct netlink_ext_ack *extack = info->extack; 6953 u8 genmask = nft_genmask_cur(info->net); 6954 u8 family = info->nfmsg->nfgen_family; 6955 const struct nft_table *table; 6956 struct net *net = info->net; 6957 struct nft_object *obj; 6958 struct sk_buff *skb2; 6959 bool reset = false; 6960 u32 objtype; 6961 int err; 6962 6963 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 6964 struct netlink_dump_control c = { 6965 .start = nf_tables_dump_obj_start, 6966 .dump = nf_tables_dump_obj, 6967 .done = nf_tables_dump_obj_done, 6968 .module = THIS_MODULE, 6969 .data = (void *)nla, 6970 }; 6971 6972 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 6973 } 6974 6975 if (!nla[NFTA_OBJ_NAME] || 6976 !nla[NFTA_OBJ_TYPE]) 6977 return -EINVAL; 6978 6979 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0); 6980 if (IS_ERR(table)) { 6981 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 6982 return PTR_ERR(table); 6983 } 6984 6985 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6986 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask); 6987 if (IS_ERR(obj)) { 6988 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6989 return PTR_ERR(obj); 6990 } 6991 6992 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 6993 if (!skb2) 6994 return -ENOMEM; 6995 6996 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) 6997 reset = true; 6998 6999 if (reset) { 7000 const struct nftables_pernet *nft_net; 7001 char *buf; 7002 7003 nft_net = nft_pernet(net); 7004 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq); 7005 7006 audit_log_nfcfg(buf, 7007 family, 7008 obj->handle, 7009 AUDIT_NFT_OP_OBJ_RESET, 7010 GFP_ATOMIC); 7011 kfree(buf); 7012 } 7013 7014 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, 7015 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, 7016 family, table, obj, reset); 7017 if (err < 0) 7018 goto err_fill_obj_info; 7019 7020 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 7021 7022 err_fill_obj_info: 7023 kfree_skb(skb2); 7024 return err; 7025 } 7026 7027 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) 7028 { 7029 if (obj->ops->destroy) 7030 obj->ops->destroy(ctx, obj); 7031 7032 module_put(obj->ops->type->owner); 7033 kfree(obj->key.name); 7034 kfree(obj->udata); 7035 kfree(obj); 7036 } 7037 7038 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info, 7039 const struct nlattr * const nla[]) 7040 { 7041 struct netlink_ext_ack *extack = info->extack; 7042 u8 genmask = nft_genmask_next(info->net); 7043 u8 family = info->nfmsg->nfgen_family; 7044 struct net *net = info->net; 7045 const struct nlattr *attr; 7046 struct nft_table *table; 7047 struct nft_object *obj; 7048 struct nft_ctx ctx; 7049 u32 objtype; 7050 7051 if (!nla[NFTA_OBJ_TYPE] || 7052 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE])) 7053 return -EINVAL; 7054 7055 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 7056 NETLINK_CB(skb).portid); 7057 if (IS_ERR(table)) { 7058 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 7059 return PTR_ERR(table); 7060 } 7061 7062 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 7063 if (nla[NFTA_OBJ_HANDLE]) { 7064 attr = nla[NFTA_OBJ_HANDLE]; 7065 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask); 7066 } else { 7067 attr = nla[NFTA_OBJ_NAME]; 7068 obj = nft_obj_lookup(net, table, attr, objtype, genmask); 7069 } 7070 7071 if (IS_ERR(obj)) { 7072 NL_SET_BAD_ATTR(extack, attr); 7073 return PTR_ERR(obj); 7074 } 7075 if (obj->use > 0) { 7076 NL_SET_BAD_ATTR(extack, attr); 7077 return -EBUSY; 7078 } 7079 7080 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7081 7082 return nft_delobj(&ctx, obj); 7083 } 7084 7085 void nft_obj_notify(struct net *net, const struct nft_table *table, 7086 struct nft_object *obj, u32 portid, u32 seq, int event, 7087 u16 flags, int family, int report, gfp_t gfp) 7088 { 7089 struct nftables_pernet *nft_net = nft_pernet(net); 7090 struct sk_buff *skb; 7091 int err; 7092 char *buf = kasprintf(gfp, "%s:%u", 7093 table->name, nft_net->base_seq); 7094 7095 audit_log_nfcfg(buf, 7096 family, 7097 obj->handle, 7098 event == NFT_MSG_NEWOBJ ? 7099 AUDIT_NFT_OP_OBJ_REGISTER : 7100 AUDIT_NFT_OP_OBJ_UNREGISTER, 7101 gfp); 7102 kfree(buf); 7103 7104 if (!report && 7105 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 7106 return; 7107 7108 skb = nlmsg_new(NLMSG_GOODSIZE, gfp); 7109 if (skb == NULL) 7110 goto err; 7111 7112 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 7113 flags & (NLM_F_CREATE | NLM_F_EXCL), 7114 family, table, obj, false); 7115 if (err < 0) { 7116 kfree_skb(skb); 7117 goto err; 7118 } 7119 7120 nft_notify_enqueue(skb, report, &nft_net->notify_list); 7121 return; 7122 err: 7123 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 7124 } 7125 EXPORT_SYMBOL_GPL(nft_obj_notify); 7126 7127 static void nf_tables_obj_notify(const struct nft_ctx *ctx, 7128 struct nft_object *obj, int event) 7129 { 7130 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, 7131 ctx->flags, ctx->family, ctx->report, GFP_KERNEL); 7132 } 7133 7134 /* 7135 * Flow tables 7136 */ 7137 void nft_register_flowtable_type(struct nf_flowtable_type *type) 7138 { 7139 nfnl_lock(NFNL_SUBSYS_NFTABLES); 7140 list_add_tail_rcu(&type->list, &nf_tables_flowtables); 7141 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 7142 } 7143 EXPORT_SYMBOL_GPL(nft_register_flowtable_type); 7144 7145 void nft_unregister_flowtable_type(struct nf_flowtable_type *type) 7146 { 7147 nfnl_lock(NFNL_SUBSYS_NFTABLES); 7148 list_del_rcu(&type->list); 7149 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 7150 } 7151 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); 7152 7153 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { 7154 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, 7155 .len = NFT_NAME_MAXLEN - 1 }, 7156 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, 7157 .len = NFT_NAME_MAXLEN - 1 }, 7158 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, 7159 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 }, 7160 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 }, 7161 }; 7162 7163 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 7164 const struct nlattr *nla, u8 genmask) 7165 { 7166 struct nft_flowtable *flowtable; 7167 7168 list_for_each_entry_rcu(flowtable, &table->flowtables, list) { 7169 if (!nla_strcmp(nla, flowtable->name) && 7170 nft_active_genmask(flowtable, genmask)) 7171 return flowtable; 7172 } 7173 return ERR_PTR(-ENOENT); 7174 } 7175 EXPORT_SYMBOL_GPL(nft_flowtable_lookup); 7176 7177 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 7178 struct nft_flowtable *flowtable, 7179 enum nft_trans_phase phase) 7180 { 7181 switch (phase) { 7182 case NFT_TRANS_PREPARE: 7183 case NFT_TRANS_ABORT: 7184 case NFT_TRANS_RELEASE: 7185 flowtable->use--; 7186 fallthrough; 7187 default: 7188 return; 7189 } 7190 } 7191 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable); 7192 7193 static struct nft_flowtable * 7194 nft_flowtable_lookup_byhandle(const struct nft_table *table, 7195 const struct nlattr *nla, u8 genmask) 7196 { 7197 struct nft_flowtable *flowtable; 7198 7199 list_for_each_entry(flowtable, &table->flowtables, list) { 7200 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle && 7201 nft_active_genmask(flowtable, genmask)) 7202 return flowtable; 7203 } 7204 return ERR_PTR(-ENOENT); 7205 } 7206 7207 struct nft_flowtable_hook { 7208 u32 num; 7209 int priority; 7210 struct list_head list; 7211 }; 7212 7213 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { 7214 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, 7215 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, 7216 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, 7217 }; 7218 7219 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx, 7220 const struct nlattr *attr, 7221 struct nft_flowtable_hook *flowtable_hook, 7222 struct nft_flowtable *flowtable, bool add) 7223 { 7224 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; 7225 struct nft_hook *hook; 7226 int hooknum, priority; 7227 int err; 7228 7229 INIT_LIST_HEAD(&flowtable_hook->list); 7230 7231 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, 7232 nft_flowtable_hook_policy, NULL); 7233 if (err < 0) 7234 return err; 7235 7236 if (add) { 7237 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || 7238 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) 7239 return -EINVAL; 7240 7241 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); 7242 if (hooknum != NF_NETDEV_INGRESS) 7243 return -EOPNOTSUPP; 7244 7245 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); 7246 7247 flowtable_hook->priority = priority; 7248 flowtable_hook->num = hooknum; 7249 } else { 7250 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) { 7251 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); 7252 if (hooknum != flowtable->hooknum) 7253 return -EOPNOTSUPP; 7254 } 7255 7256 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) { 7257 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); 7258 if (priority != flowtable->data.priority) 7259 return -EOPNOTSUPP; 7260 } 7261 7262 flowtable_hook->priority = flowtable->data.priority; 7263 flowtable_hook->num = flowtable->hooknum; 7264 } 7265 7266 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) { 7267 err = nf_tables_parse_netdev_hooks(ctx->net, 7268 tb[NFTA_FLOWTABLE_HOOK_DEVS], 7269 &flowtable_hook->list); 7270 if (err < 0) 7271 return err; 7272 } 7273 7274 list_for_each_entry(hook, &flowtable_hook->list, list) { 7275 hook->ops.pf = NFPROTO_NETDEV; 7276 hook->ops.hooknum = flowtable_hook->num; 7277 hook->ops.priority = flowtable_hook->priority; 7278 hook->ops.priv = &flowtable->data; 7279 hook->ops.hook = flowtable->data.type->hook; 7280 } 7281 7282 return err; 7283 } 7284 7285 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family) 7286 { 7287 const struct nf_flowtable_type *type; 7288 7289 list_for_each_entry(type, &nf_tables_flowtables, list) { 7290 if (family == type->family) 7291 return type; 7292 } 7293 return NULL; 7294 } 7295 7296 static const struct nf_flowtable_type * 7297 nft_flowtable_type_get(struct net *net, u8 family) 7298 { 7299 const struct nf_flowtable_type *type; 7300 7301 type = __nft_flowtable_type_get(family); 7302 if (type != NULL && try_module_get(type->owner)) 7303 return type; 7304 7305 lockdep_nfnl_nft_mutex_not_held(); 7306 #ifdef CONFIG_MODULES 7307 if (type == NULL) { 7308 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN) 7309 return ERR_PTR(-EAGAIN); 7310 } 7311 #endif 7312 return ERR_PTR(-ENOENT); 7313 } 7314 7315 /* Only called from error and netdev event paths. */ 7316 static void nft_unregister_flowtable_hook(struct net *net, 7317 struct nft_flowtable *flowtable, 7318 struct nft_hook *hook) 7319 { 7320 nf_unregister_net_hook(net, &hook->ops); 7321 flowtable->data.type->setup(&flowtable->data, hook->ops.dev, 7322 FLOW_BLOCK_UNBIND); 7323 } 7324 7325 static void __nft_unregister_flowtable_net_hooks(struct net *net, 7326 struct list_head *hook_list, 7327 bool release_netdev) 7328 { 7329 struct nft_hook *hook, *next; 7330 7331 list_for_each_entry_safe(hook, next, hook_list, list) { 7332 nf_unregister_net_hook(net, &hook->ops); 7333 if (release_netdev) { 7334 list_del(&hook->list); 7335 kfree_rcu(hook, rcu); 7336 } 7337 } 7338 } 7339 7340 static void nft_unregister_flowtable_net_hooks(struct net *net, 7341 struct list_head *hook_list) 7342 { 7343 __nft_unregister_flowtable_net_hooks(net, hook_list, false); 7344 } 7345 7346 static int nft_register_flowtable_net_hooks(struct net *net, 7347 struct nft_table *table, 7348 struct list_head *hook_list, 7349 struct nft_flowtable *flowtable) 7350 { 7351 struct nft_hook *hook, *hook2, *next; 7352 struct nft_flowtable *ft; 7353 int err, i = 0; 7354 7355 list_for_each_entry(hook, hook_list, list) { 7356 list_for_each_entry(ft, &table->flowtables, list) { 7357 if (!nft_is_active_next(net, ft)) 7358 continue; 7359 7360 list_for_each_entry(hook2, &ft->hook_list, list) { 7361 if (hook->ops.dev == hook2->ops.dev && 7362 hook->ops.pf == hook2->ops.pf) { 7363 err = -EEXIST; 7364 goto err_unregister_net_hooks; 7365 } 7366 } 7367 } 7368 7369 err = flowtable->data.type->setup(&flowtable->data, 7370 hook->ops.dev, 7371 FLOW_BLOCK_BIND); 7372 if (err < 0) 7373 goto err_unregister_net_hooks; 7374 7375 err = nf_register_net_hook(net, &hook->ops); 7376 if (err < 0) { 7377 flowtable->data.type->setup(&flowtable->data, 7378 hook->ops.dev, 7379 FLOW_BLOCK_UNBIND); 7380 goto err_unregister_net_hooks; 7381 } 7382 7383 i++; 7384 } 7385 7386 return 0; 7387 7388 err_unregister_net_hooks: 7389 list_for_each_entry_safe(hook, next, hook_list, list) { 7390 if (i-- <= 0) 7391 break; 7392 7393 nft_unregister_flowtable_hook(net, flowtable, hook); 7394 list_del_rcu(&hook->list); 7395 kfree_rcu(hook, rcu); 7396 } 7397 7398 return err; 7399 } 7400 7401 static void nft_flowtable_hooks_destroy(struct list_head *hook_list) 7402 { 7403 struct nft_hook *hook, *next; 7404 7405 list_for_each_entry_safe(hook, next, hook_list, list) { 7406 list_del_rcu(&hook->list); 7407 kfree_rcu(hook, rcu); 7408 } 7409 } 7410 7411 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh, 7412 struct nft_flowtable *flowtable) 7413 { 7414 const struct nlattr * const *nla = ctx->nla; 7415 struct nft_flowtable_hook flowtable_hook; 7416 struct nft_hook *hook, *next; 7417 struct nft_trans *trans; 7418 bool unregister = false; 7419 u32 flags; 7420 int err; 7421 7422 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK], 7423 &flowtable_hook, flowtable, false); 7424 if (err < 0) 7425 return err; 7426 7427 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) { 7428 if (nft_hook_list_find(&flowtable->hook_list, hook)) { 7429 list_del(&hook->list); 7430 kfree(hook); 7431 } 7432 } 7433 7434 if (nla[NFTA_FLOWTABLE_FLAGS]) { 7435 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS])); 7436 if (flags & ~NFT_FLOWTABLE_MASK) { 7437 err = -EOPNOTSUPP; 7438 goto err_flowtable_update_hook; 7439 } 7440 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^ 7441 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) { 7442 err = -EOPNOTSUPP; 7443 goto err_flowtable_update_hook; 7444 } 7445 } else { 7446 flags = flowtable->data.flags; 7447 } 7448 7449 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table, 7450 &flowtable_hook.list, flowtable); 7451 if (err < 0) 7452 goto err_flowtable_update_hook; 7453 7454 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE, 7455 sizeof(struct nft_trans_flowtable)); 7456 if (!trans) { 7457 unregister = true; 7458 err = -ENOMEM; 7459 goto err_flowtable_update_hook; 7460 } 7461 7462 nft_trans_flowtable_flags(trans) = flags; 7463 nft_trans_flowtable(trans) = flowtable; 7464 nft_trans_flowtable_update(trans) = true; 7465 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 7466 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans)); 7467 7468 nft_trans_commit_list_add_tail(ctx->net, trans); 7469 7470 return 0; 7471 7472 err_flowtable_update_hook: 7473 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) { 7474 if (unregister) 7475 nft_unregister_flowtable_hook(ctx->net, flowtable, hook); 7476 list_del_rcu(&hook->list); 7477 kfree_rcu(hook, rcu); 7478 } 7479 7480 return err; 7481 7482 } 7483 7484 static int nf_tables_newflowtable(struct sk_buff *skb, 7485 const struct nfnl_info *info, 7486 const struct nlattr * const nla[]) 7487 { 7488 struct netlink_ext_ack *extack = info->extack; 7489 struct nft_flowtable_hook flowtable_hook; 7490 u8 genmask = nft_genmask_next(info->net); 7491 u8 family = info->nfmsg->nfgen_family; 7492 const struct nf_flowtable_type *type; 7493 struct nft_flowtable *flowtable; 7494 struct nft_hook *hook, *next; 7495 struct net *net = info->net; 7496 struct nft_table *table; 7497 struct nft_ctx ctx; 7498 int err; 7499 7500 if (!nla[NFTA_FLOWTABLE_TABLE] || 7501 !nla[NFTA_FLOWTABLE_NAME] || 7502 !nla[NFTA_FLOWTABLE_HOOK]) 7503 return -EINVAL; 7504 7505 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7506 genmask, NETLINK_CB(skb).portid); 7507 if (IS_ERR(table)) { 7508 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); 7509 return PTR_ERR(table); 7510 } 7511 7512 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], 7513 genmask); 7514 if (IS_ERR(flowtable)) { 7515 err = PTR_ERR(flowtable); 7516 if (err != -ENOENT) { 7517 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); 7518 return err; 7519 } 7520 } else { 7521 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 7522 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); 7523 return -EEXIST; 7524 } 7525 7526 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7527 7528 return nft_flowtable_update(&ctx, info->nlh, flowtable); 7529 } 7530 7531 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7532 7533 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT); 7534 if (!flowtable) 7535 return -ENOMEM; 7536 7537 flowtable->table = table; 7538 flowtable->handle = nf_tables_alloc_handle(table); 7539 INIT_LIST_HEAD(&flowtable->hook_list); 7540 7541 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT); 7542 if (!flowtable->name) { 7543 err = -ENOMEM; 7544 goto err1; 7545 } 7546 7547 type = nft_flowtable_type_get(net, family); 7548 if (IS_ERR(type)) { 7549 err = PTR_ERR(type); 7550 goto err2; 7551 } 7552 7553 if (nla[NFTA_FLOWTABLE_FLAGS]) { 7554 flowtable->data.flags = 7555 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS])); 7556 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) { 7557 err = -EOPNOTSUPP; 7558 goto err3; 7559 } 7560 } 7561 7562 write_pnet(&flowtable->data.net, net); 7563 flowtable->data.type = type; 7564 err = type->init(&flowtable->data); 7565 if (err < 0) 7566 goto err3; 7567 7568 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], 7569 &flowtable_hook, flowtable, true); 7570 if (err < 0) 7571 goto err4; 7572 7573 list_splice(&flowtable_hook.list, &flowtable->hook_list); 7574 flowtable->data.priority = flowtable_hook.priority; 7575 flowtable->hooknum = flowtable_hook.num; 7576 7577 err = nft_register_flowtable_net_hooks(ctx.net, table, 7578 &flowtable->hook_list, 7579 flowtable); 7580 if (err < 0) { 7581 nft_flowtable_hooks_destroy(&flowtable->hook_list); 7582 goto err4; 7583 } 7584 7585 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); 7586 if (err < 0) 7587 goto err5; 7588 7589 list_add_tail_rcu(&flowtable->list, &table->flowtables); 7590 table->use++; 7591 7592 return 0; 7593 err5: 7594 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 7595 nft_unregister_flowtable_hook(net, flowtable, hook); 7596 list_del_rcu(&hook->list); 7597 kfree_rcu(hook, rcu); 7598 } 7599 err4: 7600 flowtable->data.type->free(&flowtable->data); 7601 err3: 7602 module_put(type->owner); 7603 err2: 7604 kfree(flowtable->name); 7605 err1: 7606 kfree(flowtable); 7607 return err; 7608 } 7609 7610 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook) 7611 { 7612 struct nft_hook *this, *next; 7613 7614 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) { 7615 list_del(&this->list); 7616 kfree(this); 7617 } 7618 } 7619 7620 static int nft_delflowtable_hook(struct nft_ctx *ctx, 7621 struct nft_flowtable *flowtable) 7622 { 7623 const struct nlattr * const *nla = ctx->nla; 7624 struct nft_flowtable_hook flowtable_hook; 7625 LIST_HEAD(flowtable_del_list); 7626 struct nft_hook *this, *hook; 7627 struct nft_trans *trans; 7628 int err; 7629 7630 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK], 7631 &flowtable_hook, flowtable, false); 7632 if (err < 0) 7633 return err; 7634 7635 list_for_each_entry(this, &flowtable_hook.list, list) { 7636 hook = nft_hook_list_find(&flowtable->hook_list, this); 7637 if (!hook) { 7638 err = -ENOENT; 7639 goto err_flowtable_del_hook; 7640 } 7641 list_move(&hook->list, &flowtable_del_list); 7642 } 7643 7644 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE, 7645 sizeof(struct nft_trans_flowtable)); 7646 if (!trans) { 7647 err = -ENOMEM; 7648 goto err_flowtable_del_hook; 7649 } 7650 7651 nft_trans_flowtable(trans) = flowtable; 7652 nft_trans_flowtable_update(trans) = true; 7653 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 7654 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans)); 7655 nft_flowtable_hook_release(&flowtable_hook); 7656 7657 nft_trans_commit_list_add_tail(ctx->net, trans); 7658 7659 return 0; 7660 7661 err_flowtable_del_hook: 7662 list_splice(&flowtable_del_list, &flowtable->hook_list); 7663 nft_flowtable_hook_release(&flowtable_hook); 7664 7665 return err; 7666 } 7667 7668 static int nf_tables_delflowtable(struct sk_buff *skb, 7669 const struct nfnl_info *info, 7670 const struct nlattr * const nla[]) 7671 { 7672 struct netlink_ext_ack *extack = info->extack; 7673 u8 genmask = nft_genmask_next(info->net); 7674 u8 family = info->nfmsg->nfgen_family; 7675 struct nft_flowtable *flowtable; 7676 struct net *net = info->net; 7677 const struct nlattr *attr; 7678 struct nft_table *table; 7679 struct nft_ctx ctx; 7680 7681 if (!nla[NFTA_FLOWTABLE_TABLE] || 7682 (!nla[NFTA_FLOWTABLE_NAME] && 7683 !nla[NFTA_FLOWTABLE_HANDLE])) 7684 return -EINVAL; 7685 7686 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7687 genmask, NETLINK_CB(skb).portid); 7688 if (IS_ERR(table)) { 7689 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); 7690 return PTR_ERR(table); 7691 } 7692 7693 if (nla[NFTA_FLOWTABLE_HANDLE]) { 7694 attr = nla[NFTA_FLOWTABLE_HANDLE]; 7695 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask); 7696 } else { 7697 attr = nla[NFTA_FLOWTABLE_NAME]; 7698 flowtable = nft_flowtable_lookup(table, attr, genmask); 7699 } 7700 7701 if (IS_ERR(flowtable)) { 7702 NL_SET_BAD_ATTR(extack, attr); 7703 return PTR_ERR(flowtable); 7704 } 7705 7706 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7707 7708 if (nla[NFTA_FLOWTABLE_HOOK]) 7709 return nft_delflowtable_hook(&ctx, flowtable); 7710 7711 if (flowtable->use > 0) { 7712 NL_SET_BAD_ATTR(extack, attr); 7713 return -EBUSY; 7714 } 7715 7716 return nft_delflowtable(&ctx, flowtable); 7717 } 7718 7719 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, 7720 u32 portid, u32 seq, int event, 7721 u32 flags, int family, 7722 struct nft_flowtable *flowtable, 7723 struct list_head *hook_list) 7724 { 7725 struct nlattr *nest, *nest_devs; 7726 struct nft_hook *hook; 7727 struct nlmsghdr *nlh; 7728 7729 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 7730 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 7731 NFNETLINK_V0, nft_base_seq(net)); 7732 if (!nlh) 7733 goto nla_put_failure; 7734 7735 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || 7736 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || 7737 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) || 7738 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle), 7739 NFTA_FLOWTABLE_PAD) || 7740 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags))) 7741 goto nla_put_failure; 7742 7743 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK); 7744 if (!nest) 7745 goto nla_put_failure; 7746 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || 7747 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority))) 7748 goto nla_put_failure; 7749 7750 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS); 7751 if (!nest_devs) 7752 goto nla_put_failure; 7753 7754 list_for_each_entry_rcu(hook, hook_list, list) { 7755 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name)) 7756 goto nla_put_failure; 7757 } 7758 nla_nest_end(skb, nest_devs); 7759 nla_nest_end(skb, nest); 7760 7761 nlmsg_end(skb, nlh); 7762 return 0; 7763 7764 nla_put_failure: 7765 nlmsg_trim(skb, nlh); 7766 return -1; 7767 } 7768 7769 struct nft_flowtable_filter { 7770 char *table; 7771 }; 7772 7773 static int nf_tables_dump_flowtable(struct sk_buff *skb, 7774 struct netlink_callback *cb) 7775 { 7776 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 7777 struct nft_flowtable_filter *filter = cb->data; 7778 unsigned int idx = 0, s_idx = cb->args[0]; 7779 struct net *net = sock_net(skb->sk); 7780 int family = nfmsg->nfgen_family; 7781 struct nft_flowtable *flowtable; 7782 struct nftables_pernet *nft_net; 7783 const struct nft_table *table; 7784 7785 rcu_read_lock(); 7786 nft_net = nft_pernet(net); 7787 cb->seq = nft_net->base_seq; 7788 7789 list_for_each_entry_rcu(table, &nft_net->tables, list) { 7790 if (family != NFPROTO_UNSPEC && family != table->family) 7791 continue; 7792 7793 list_for_each_entry_rcu(flowtable, &table->flowtables, list) { 7794 if (!nft_is_active(net, flowtable)) 7795 goto cont; 7796 if (idx < s_idx) 7797 goto cont; 7798 if (idx > s_idx) 7799 memset(&cb->args[1], 0, 7800 sizeof(cb->args) - sizeof(cb->args[0])); 7801 if (filter && filter->table && 7802 strcmp(filter->table, table->name)) 7803 goto cont; 7804 7805 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, 7806 cb->nlh->nlmsg_seq, 7807 NFT_MSG_NEWFLOWTABLE, 7808 NLM_F_MULTI | NLM_F_APPEND, 7809 table->family, 7810 flowtable, 7811 &flowtable->hook_list) < 0) 7812 goto done; 7813 7814 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 7815 cont: 7816 idx++; 7817 } 7818 } 7819 done: 7820 rcu_read_unlock(); 7821 7822 cb->args[0] = idx; 7823 return skb->len; 7824 } 7825 7826 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb) 7827 { 7828 const struct nlattr * const *nla = cb->data; 7829 struct nft_flowtable_filter *filter = NULL; 7830 7831 if (nla[NFTA_FLOWTABLE_TABLE]) { 7832 filter = kzalloc(sizeof(*filter), GFP_ATOMIC); 7833 if (!filter) 7834 return -ENOMEM; 7835 7836 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], 7837 GFP_ATOMIC); 7838 if (!filter->table) { 7839 kfree(filter); 7840 return -ENOMEM; 7841 } 7842 } 7843 7844 cb->data = filter; 7845 return 0; 7846 } 7847 7848 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) 7849 { 7850 struct nft_flowtable_filter *filter = cb->data; 7851 7852 if (!filter) 7853 return 0; 7854 7855 kfree(filter->table); 7856 kfree(filter); 7857 7858 return 0; 7859 } 7860 7861 /* called with rcu_read_lock held */ 7862 static int nf_tables_getflowtable(struct sk_buff *skb, 7863 const struct nfnl_info *info, 7864 const struct nlattr * const nla[]) 7865 { 7866 u8 genmask = nft_genmask_cur(info->net); 7867 u8 family = info->nfmsg->nfgen_family; 7868 struct nft_flowtable *flowtable; 7869 const struct nft_table *table; 7870 struct net *net = info->net; 7871 struct sk_buff *skb2; 7872 int err; 7873 7874 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 7875 struct netlink_dump_control c = { 7876 .start = nf_tables_dump_flowtable_start, 7877 .dump = nf_tables_dump_flowtable, 7878 .done = nf_tables_dump_flowtable_done, 7879 .module = THIS_MODULE, 7880 .data = (void *)nla, 7881 }; 7882 7883 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 7884 } 7885 7886 if (!nla[NFTA_FLOWTABLE_NAME]) 7887 return -EINVAL; 7888 7889 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7890 genmask, 0); 7891 if (IS_ERR(table)) 7892 return PTR_ERR(table); 7893 7894 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], 7895 genmask); 7896 if (IS_ERR(flowtable)) 7897 return PTR_ERR(flowtable); 7898 7899 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 7900 if (!skb2) 7901 return -ENOMEM; 7902 7903 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, 7904 info->nlh->nlmsg_seq, 7905 NFT_MSG_NEWFLOWTABLE, 0, family, 7906 flowtable, &flowtable->hook_list); 7907 if (err < 0) 7908 goto err_fill_flowtable_info; 7909 7910 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 7911 7912 err_fill_flowtable_info: 7913 kfree_skb(skb2); 7914 return err; 7915 } 7916 7917 static void nf_tables_flowtable_notify(struct nft_ctx *ctx, 7918 struct nft_flowtable *flowtable, 7919 struct list_head *hook_list, 7920 int event) 7921 { 7922 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 7923 struct sk_buff *skb; 7924 u16 flags = 0; 7925 int err; 7926 7927 if (!ctx->report && 7928 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 7929 return; 7930 7931 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 7932 if (skb == NULL) 7933 goto err; 7934 7935 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 7936 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 7937 7938 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, 7939 ctx->seq, event, flags, 7940 ctx->family, flowtable, hook_list); 7941 if (err < 0) { 7942 kfree_skb(skb); 7943 goto err; 7944 } 7945 7946 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 7947 return; 7948 err: 7949 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 7950 } 7951 7952 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) 7953 { 7954 struct nft_hook *hook, *next; 7955 7956 flowtable->data.type->free(&flowtable->data); 7957 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 7958 flowtable->data.type->setup(&flowtable->data, hook->ops.dev, 7959 FLOW_BLOCK_UNBIND); 7960 list_del_rcu(&hook->list); 7961 kfree(hook); 7962 } 7963 kfree(flowtable->name); 7964 module_put(flowtable->data.type->owner); 7965 kfree(flowtable); 7966 } 7967 7968 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, 7969 u32 portid, u32 seq) 7970 { 7971 struct nftables_pernet *nft_net = nft_pernet(net); 7972 struct nlmsghdr *nlh; 7973 char buf[TASK_COMM_LEN]; 7974 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); 7975 7976 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC, 7977 NFNETLINK_V0, nft_base_seq(net)); 7978 if (!nlh) 7979 goto nla_put_failure; 7980 7981 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) || 7982 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || 7983 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) 7984 goto nla_put_failure; 7985 7986 nlmsg_end(skb, nlh); 7987 return 0; 7988 7989 nla_put_failure: 7990 nlmsg_trim(skb, nlh); 7991 return -EMSGSIZE; 7992 } 7993 7994 static void nft_flowtable_event(unsigned long event, struct net_device *dev, 7995 struct nft_flowtable *flowtable) 7996 { 7997 struct nft_hook *hook; 7998 7999 list_for_each_entry(hook, &flowtable->hook_list, list) { 8000 if (hook->ops.dev != dev) 8001 continue; 8002 8003 /* flow_offload_netdev_event() cleans up entries for us. */ 8004 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook); 8005 list_del_rcu(&hook->list); 8006 kfree_rcu(hook, rcu); 8007 break; 8008 } 8009 } 8010 8011 static int nf_tables_flowtable_event(struct notifier_block *this, 8012 unsigned long event, void *ptr) 8013 { 8014 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 8015 struct nft_flowtable *flowtable; 8016 struct nftables_pernet *nft_net; 8017 struct nft_table *table; 8018 struct net *net; 8019 8020 if (event != NETDEV_UNREGISTER) 8021 return 0; 8022 8023 net = dev_net(dev); 8024 nft_net = nft_pernet(net); 8025 mutex_lock(&nft_net->commit_mutex); 8026 list_for_each_entry(table, &nft_net->tables, list) { 8027 list_for_each_entry(flowtable, &table->flowtables, list) { 8028 nft_flowtable_event(event, dev, flowtable); 8029 } 8030 } 8031 mutex_unlock(&nft_net->commit_mutex); 8032 8033 return NOTIFY_DONE; 8034 } 8035 8036 static struct notifier_block nf_tables_flowtable_notifier = { 8037 .notifier_call = nf_tables_flowtable_event, 8038 }; 8039 8040 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, 8041 int event) 8042 { 8043 struct nlmsghdr *nlh = nlmsg_hdr(skb); 8044 struct sk_buff *skb2; 8045 int err; 8046 8047 if (!nlmsg_report(nlh) && 8048 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 8049 return; 8050 8051 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 8052 if (skb2 == NULL) 8053 goto err; 8054 8055 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, 8056 nlh->nlmsg_seq); 8057 if (err < 0) { 8058 kfree_skb(skb2); 8059 goto err; 8060 } 8061 8062 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, 8063 nlmsg_report(nlh), GFP_KERNEL); 8064 return; 8065 err: 8066 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, 8067 -ENOBUFS); 8068 } 8069 8070 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info, 8071 const struct nlattr * const nla[]) 8072 { 8073 struct sk_buff *skb2; 8074 int err; 8075 8076 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 8077 if (skb2 == NULL) 8078 return -ENOMEM; 8079 8080 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid, 8081 info->nlh->nlmsg_seq); 8082 if (err < 0) 8083 goto err_fill_gen_info; 8084 8085 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 8086 8087 err_fill_gen_info: 8088 kfree_skb(skb2); 8089 return err; 8090 } 8091 8092 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { 8093 [NFT_MSG_NEWTABLE] = { 8094 .call = nf_tables_newtable, 8095 .type = NFNL_CB_BATCH, 8096 .attr_count = NFTA_TABLE_MAX, 8097 .policy = nft_table_policy, 8098 }, 8099 [NFT_MSG_GETTABLE] = { 8100 .call = nf_tables_gettable, 8101 .type = NFNL_CB_RCU, 8102 .attr_count = NFTA_TABLE_MAX, 8103 .policy = nft_table_policy, 8104 }, 8105 [NFT_MSG_DELTABLE] = { 8106 .call = nf_tables_deltable, 8107 .type = NFNL_CB_BATCH, 8108 .attr_count = NFTA_TABLE_MAX, 8109 .policy = nft_table_policy, 8110 }, 8111 [NFT_MSG_NEWCHAIN] = { 8112 .call = nf_tables_newchain, 8113 .type = NFNL_CB_BATCH, 8114 .attr_count = NFTA_CHAIN_MAX, 8115 .policy = nft_chain_policy, 8116 }, 8117 [NFT_MSG_GETCHAIN] = { 8118 .call = nf_tables_getchain, 8119 .type = NFNL_CB_RCU, 8120 .attr_count = NFTA_CHAIN_MAX, 8121 .policy = nft_chain_policy, 8122 }, 8123 [NFT_MSG_DELCHAIN] = { 8124 .call = nf_tables_delchain, 8125 .type = NFNL_CB_BATCH, 8126 .attr_count = NFTA_CHAIN_MAX, 8127 .policy = nft_chain_policy, 8128 }, 8129 [NFT_MSG_NEWRULE] = { 8130 .call = nf_tables_newrule, 8131 .type = NFNL_CB_BATCH, 8132 .attr_count = NFTA_RULE_MAX, 8133 .policy = nft_rule_policy, 8134 }, 8135 [NFT_MSG_GETRULE] = { 8136 .call = nf_tables_getrule, 8137 .type = NFNL_CB_RCU, 8138 .attr_count = NFTA_RULE_MAX, 8139 .policy = nft_rule_policy, 8140 }, 8141 [NFT_MSG_DELRULE] = { 8142 .call = nf_tables_delrule, 8143 .type = NFNL_CB_BATCH, 8144 .attr_count = NFTA_RULE_MAX, 8145 .policy = nft_rule_policy, 8146 }, 8147 [NFT_MSG_NEWSET] = { 8148 .call = nf_tables_newset, 8149 .type = NFNL_CB_BATCH, 8150 .attr_count = NFTA_SET_MAX, 8151 .policy = nft_set_policy, 8152 }, 8153 [NFT_MSG_GETSET] = { 8154 .call = nf_tables_getset, 8155 .type = NFNL_CB_RCU, 8156 .attr_count = NFTA_SET_MAX, 8157 .policy = nft_set_policy, 8158 }, 8159 [NFT_MSG_DELSET] = { 8160 .call = nf_tables_delset, 8161 .type = NFNL_CB_BATCH, 8162 .attr_count = NFTA_SET_MAX, 8163 .policy = nft_set_policy, 8164 }, 8165 [NFT_MSG_NEWSETELEM] = { 8166 .call = nf_tables_newsetelem, 8167 .type = NFNL_CB_BATCH, 8168 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8169 .policy = nft_set_elem_list_policy, 8170 }, 8171 [NFT_MSG_GETSETELEM] = { 8172 .call = nf_tables_getsetelem, 8173 .type = NFNL_CB_RCU, 8174 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8175 .policy = nft_set_elem_list_policy, 8176 }, 8177 [NFT_MSG_DELSETELEM] = { 8178 .call = nf_tables_delsetelem, 8179 .type = NFNL_CB_BATCH, 8180 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8181 .policy = nft_set_elem_list_policy, 8182 }, 8183 [NFT_MSG_GETGEN] = { 8184 .call = nf_tables_getgen, 8185 .type = NFNL_CB_RCU, 8186 }, 8187 [NFT_MSG_NEWOBJ] = { 8188 .call = nf_tables_newobj, 8189 .type = NFNL_CB_BATCH, 8190 .attr_count = NFTA_OBJ_MAX, 8191 .policy = nft_obj_policy, 8192 }, 8193 [NFT_MSG_GETOBJ] = { 8194 .call = nf_tables_getobj, 8195 .type = NFNL_CB_RCU, 8196 .attr_count = NFTA_OBJ_MAX, 8197 .policy = nft_obj_policy, 8198 }, 8199 [NFT_MSG_DELOBJ] = { 8200 .call = nf_tables_delobj, 8201 .type = NFNL_CB_BATCH, 8202 .attr_count = NFTA_OBJ_MAX, 8203 .policy = nft_obj_policy, 8204 }, 8205 [NFT_MSG_GETOBJ_RESET] = { 8206 .call = nf_tables_getobj, 8207 .type = NFNL_CB_RCU, 8208 .attr_count = NFTA_OBJ_MAX, 8209 .policy = nft_obj_policy, 8210 }, 8211 [NFT_MSG_NEWFLOWTABLE] = { 8212 .call = nf_tables_newflowtable, 8213 .type = NFNL_CB_BATCH, 8214 .attr_count = NFTA_FLOWTABLE_MAX, 8215 .policy = nft_flowtable_policy, 8216 }, 8217 [NFT_MSG_GETFLOWTABLE] = { 8218 .call = nf_tables_getflowtable, 8219 .type = NFNL_CB_RCU, 8220 .attr_count = NFTA_FLOWTABLE_MAX, 8221 .policy = nft_flowtable_policy, 8222 }, 8223 [NFT_MSG_DELFLOWTABLE] = { 8224 .call = nf_tables_delflowtable, 8225 .type = NFNL_CB_BATCH, 8226 .attr_count = NFTA_FLOWTABLE_MAX, 8227 .policy = nft_flowtable_policy, 8228 }, 8229 }; 8230 8231 static int nf_tables_validate(struct net *net) 8232 { 8233 struct nftables_pernet *nft_net = nft_pernet(net); 8234 struct nft_table *table; 8235 8236 switch (nft_net->validate_state) { 8237 case NFT_VALIDATE_SKIP: 8238 break; 8239 case NFT_VALIDATE_NEED: 8240 nft_validate_state_update(net, NFT_VALIDATE_DO); 8241 fallthrough; 8242 case NFT_VALIDATE_DO: 8243 list_for_each_entry(table, &nft_net->tables, list) { 8244 if (nft_table_validate(net, table) < 0) 8245 return -EAGAIN; 8246 } 8247 break; 8248 } 8249 8250 return 0; 8251 } 8252 8253 /* a drop policy has to be deferred until all rules have been activated, 8254 * otherwise a large ruleset that contains a drop-policy base chain will 8255 * cause all packets to get dropped until the full transaction has been 8256 * processed. 8257 * 8258 * We defer the drop policy until the transaction has been finalized. 8259 */ 8260 static void nft_chain_commit_drop_policy(struct nft_trans *trans) 8261 { 8262 struct nft_base_chain *basechain; 8263 8264 if (nft_trans_chain_policy(trans) != NF_DROP) 8265 return; 8266 8267 if (!nft_is_base_chain(trans->ctx.chain)) 8268 return; 8269 8270 basechain = nft_base_chain(trans->ctx.chain); 8271 basechain->policy = NF_DROP; 8272 } 8273 8274 static void nft_chain_commit_update(struct nft_trans *trans) 8275 { 8276 struct nft_base_chain *basechain; 8277 8278 if (nft_trans_chain_name(trans)) { 8279 rhltable_remove(&trans->ctx.table->chains_ht, 8280 &trans->ctx.chain->rhlhead, 8281 nft_chain_ht_params); 8282 swap(trans->ctx.chain->name, nft_trans_chain_name(trans)); 8283 rhltable_insert_key(&trans->ctx.table->chains_ht, 8284 trans->ctx.chain->name, 8285 &trans->ctx.chain->rhlhead, 8286 nft_chain_ht_params); 8287 } 8288 8289 if (!nft_is_base_chain(trans->ctx.chain)) 8290 return; 8291 8292 nft_chain_stats_replace(trans); 8293 8294 basechain = nft_base_chain(trans->ctx.chain); 8295 8296 switch (nft_trans_chain_policy(trans)) { 8297 case NF_DROP: 8298 case NF_ACCEPT: 8299 basechain->policy = nft_trans_chain_policy(trans); 8300 break; 8301 } 8302 } 8303 8304 static void nft_obj_commit_update(struct nft_trans *trans) 8305 { 8306 struct nft_object *newobj; 8307 struct nft_object *obj; 8308 8309 obj = nft_trans_obj(trans); 8310 newobj = nft_trans_obj_newobj(trans); 8311 8312 if (obj->ops->update) 8313 obj->ops->update(obj, newobj); 8314 8315 nft_obj_destroy(&trans->ctx, newobj); 8316 } 8317 8318 static void nft_commit_release(struct nft_trans *trans) 8319 { 8320 switch (trans->msg_type) { 8321 case NFT_MSG_DELTABLE: 8322 nf_tables_table_destroy(&trans->ctx); 8323 break; 8324 case NFT_MSG_NEWCHAIN: 8325 free_percpu(nft_trans_chain_stats(trans)); 8326 kfree(nft_trans_chain_name(trans)); 8327 break; 8328 case NFT_MSG_DELCHAIN: 8329 nf_tables_chain_destroy(&trans->ctx); 8330 break; 8331 case NFT_MSG_DELRULE: 8332 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 8333 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 8334 8335 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); 8336 break; 8337 case NFT_MSG_DELSET: 8338 nft_set_destroy(&trans->ctx, nft_trans_set(trans)); 8339 break; 8340 case NFT_MSG_DELSETELEM: 8341 nf_tables_set_elem_destroy(&trans->ctx, 8342 nft_trans_elem_set(trans), 8343 nft_trans_elem(trans).priv); 8344 break; 8345 case NFT_MSG_DELOBJ: 8346 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); 8347 break; 8348 case NFT_MSG_DELFLOWTABLE: 8349 if (nft_trans_flowtable_update(trans)) 8350 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans)); 8351 else 8352 nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); 8353 break; 8354 } 8355 8356 if (trans->put_net) 8357 put_net(trans->ctx.net); 8358 8359 kfree(trans); 8360 } 8361 8362 static void nf_tables_trans_destroy_work(struct work_struct *w) 8363 { 8364 struct nft_trans *trans, *next; 8365 LIST_HEAD(head); 8366 8367 spin_lock(&nf_tables_destroy_list_lock); 8368 list_splice_init(&nf_tables_destroy_list, &head); 8369 spin_unlock(&nf_tables_destroy_list_lock); 8370 8371 if (list_empty(&head)) 8372 return; 8373 8374 synchronize_rcu(); 8375 8376 list_for_each_entry_safe(trans, next, &head, list) { 8377 list_del(&trans->list); 8378 nft_commit_release(trans); 8379 } 8380 } 8381 8382 void nf_tables_trans_destroy_flush_work(void) 8383 { 8384 flush_work(&trans_destroy_work); 8385 } 8386 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work); 8387 8388 static bool nft_expr_reduce(struct nft_regs_track *track, 8389 const struct nft_expr *expr) 8390 { 8391 return false; 8392 } 8393 8394 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain) 8395 { 8396 const struct nft_expr *expr, *last; 8397 struct nft_regs_track track = {}; 8398 unsigned int size, data_size; 8399 void *data, *data_boundary; 8400 struct nft_rule_dp *prule; 8401 struct nft_rule *rule; 8402 8403 /* already handled or inactive chain? */ 8404 if (chain->blob_next || !nft_is_active_next(net, chain)) 8405 return 0; 8406 8407 data_size = 0; 8408 list_for_each_entry(rule, &chain->rules, list) { 8409 if (nft_is_active_next(net, rule)) { 8410 data_size += sizeof(*prule) + rule->dlen; 8411 if (data_size > INT_MAX) 8412 return -ENOMEM; 8413 } 8414 } 8415 data_size += offsetof(struct nft_rule_dp, data); /* last rule */ 8416 8417 chain->blob_next = nf_tables_chain_alloc_rules(data_size); 8418 if (!chain->blob_next) 8419 return -ENOMEM; 8420 8421 data = (void *)chain->blob_next->data; 8422 data_boundary = data + data_size; 8423 size = 0; 8424 8425 list_for_each_entry(rule, &chain->rules, list) { 8426 if (!nft_is_active_next(net, rule)) 8427 continue; 8428 8429 prule = (struct nft_rule_dp *)data; 8430 data += offsetof(struct nft_rule_dp, data); 8431 if (WARN_ON_ONCE(data > data_boundary)) 8432 return -ENOMEM; 8433 8434 size = 0; 8435 track.last = nft_expr_last(rule); 8436 nft_rule_for_each_expr(expr, last, rule) { 8437 track.cur = expr; 8438 8439 if (nft_expr_reduce(&track, expr)) { 8440 expr = track.cur; 8441 continue; 8442 } 8443 8444 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary)) 8445 return -ENOMEM; 8446 8447 memcpy(data + size, expr, expr->ops->size); 8448 size += expr->ops->size; 8449 } 8450 if (WARN_ON_ONCE(size >= 1 << 12)) 8451 return -ENOMEM; 8452 8453 prule->handle = rule->handle; 8454 prule->dlen = size; 8455 prule->is_last = 0; 8456 8457 data += size; 8458 size = 0; 8459 chain->blob_next->size += (unsigned long)(data - (void *)prule); 8460 } 8461 8462 prule = (struct nft_rule_dp *)data; 8463 data += offsetof(struct nft_rule_dp, data); 8464 if (WARN_ON_ONCE(data > data_boundary)) 8465 return -ENOMEM; 8466 8467 nft_last_rule(chain->blob_next, prule); 8468 8469 return 0; 8470 } 8471 8472 static void nf_tables_commit_chain_prepare_cancel(struct net *net) 8473 { 8474 struct nftables_pernet *nft_net = nft_pernet(net); 8475 struct nft_trans *trans, *next; 8476 8477 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8478 struct nft_chain *chain = trans->ctx.chain; 8479 8480 if (trans->msg_type == NFT_MSG_NEWRULE || 8481 trans->msg_type == NFT_MSG_DELRULE) { 8482 kvfree(chain->blob_next); 8483 chain->blob_next = NULL; 8484 } 8485 } 8486 } 8487 8488 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h) 8489 { 8490 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h); 8491 8492 kvfree(o->blob); 8493 } 8494 8495 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob) 8496 { 8497 struct nft_rules_old *old; 8498 8499 /* rcu_head is after end marker */ 8500 old = (void *)blob + sizeof(*blob) + blob->size; 8501 old->blob = blob; 8502 8503 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old); 8504 } 8505 8506 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain) 8507 { 8508 struct nft_rule_blob *g0, *g1; 8509 bool next_genbit; 8510 8511 next_genbit = nft_gencursor_next(net); 8512 8513 g0 = rcu_dereference_protected(chain->blob_gen_0, 8514 lockdep_commit_lock_is_held(net)); 8515 g1 = rcu_dereference_protected(chain->blob_gen_1, 8516 lockdep_commit_lock_is_held(net)); 8517 8518 /* No changes to this chain? */ 8519 if (chain->blob_next == NULL) { 8520 /* chain had no change in last or next generation */ 8521 if (g0 == g1) 8522 return; 8523 /* 8524 * chain had no change in this generation; make sure next 8525 * one uses same rules as current generation. 8526 */ 8527 if (next_genbit) { 8528 rcu_assign_pointer(chain->blob_gen_1, g0); 8529 nf_tables_commit_chain_free_rules_old(g1); 8530 } else { 8531 rcu_assign_pointer(chain->blob_gen_0, g1); 8532 nf_tables_commit_chain_free_rules_old(g0); 8533 } 8534 8535 return; 8536 } 8537 8538 if (next_genbit) 8539 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next); 8540 else 8541 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next); 8542 8543 chain->blob_next = NULL; 8544 8545 if (g0 == g1) 8546 return; 8547 8548 if (next_genbit) 8549 nf_tables_commit_chain_free_rules_old(g1); 8550 else 8551 nf_tables_commit_chain_free_rules_old(g0); 8552 } 8553 8554 static void nft_obj_del(struct nft_object *obj) 8555 { 8556 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params); 8557 list_del_rcu(&obj->list); 8558 } 8559 8560 void nft_chain_del(struct nft_chain *chain) 8561 { 8562 struct nft_table *table = chain->table; 8563 8564 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead, 8565 nft_chain_ht_params)); 8566 list_del_rcu(&chain->list); 8567 } 8568 8569 static void nf_tables_module_autoload_cleanup(struct net *net) 8570 { 8571 struct nftables_pernet *nft_net = nft_pernet(net); 8572 struct nft_module_request *req, *next; 8573 8574 WARN_ON_ONCE(!list_empty(&nft_net->commit_list)); 8575 list_for_each_entry_safe(req, next, &nft_net->module_list, list) { 8576 WARN_ON_ONCE(!req->done); 8577 list_del(&req->list); 8578 kfree(req); 8579 } 8580 } 8581 8582 static void nf_tables_commit_release(struct net *net) 8583 { 8584 struct nftables_pernet *nft_net = nft_pernet(net); 8585 struct nft_trans *trans; 8586 8587 /* all side effects have to be made visible. 8588 * For example, if a chain named 'foo' has been deleted, a 8589 * new transaction must not find it anymore. 8590 * 8591 * Memory reclaim happens asynchronously from work queue 8592 * to prevent expensive synchronize_rcu() in commit phase. 8593 */ 8594 if (list_empty(&nft_net->commit_list)) { 8595 nf_tables_module_autoload_cleanup(net); 8596 mutex_unlock(&nft_net->commit_mutex); 8597 return; 8598 } 8599 8600 trans = list_last_entry(&nft_net->commit_list, 8601 struct nft_trans, list); 8602 get_net(trans->ctx.net); 8603 WARN_ON_ONCE(trans->put_net); 8604 8605 trans->put_net = true; 8606 spin_lock(&nf_tables_destroy_list_lock); 8607 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list); 8608 spin_unlock(&nf_tables_destroy_list_lock); 8609 8610 nf_tables_module_autoload_cleanup(net); 8611 schedule_work(&trans_destroy_work); 8612 8613 mutex_unlock(&nft_net->commit_mutex); 8614 } 8615 8616 static void nft_commit_notify(struct net *net, u32 portid) 8617 { 8618 struct nftables_pernet *nft_net = nft_pernet(net); 8619 struct sk_buff *batch_skb = NULL, *nskb, *skb; 8620 unsigned char *data; 8621 int len; 8622 8623 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) { 8624 if (!batch_skb) { 8625 new_batch: 8626 batch_skb = skb; 8627 len = NLMSG_GOODSIZE - skb->len; 8628 list_del(&skb->list); 8629 continue; 8630 } 8631 len -= skb->len; 8632 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) { 8633 data = skb_put(batch_skb, skb->len); 8634 memcpy(data, skb->data, skb->len); 8635 list_del(&skb->list); 8636 kfree_skb(skb); 8637 continue; 8638 } 8639 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES, 8640 NFT_CB(batch_skb).report, GFP_KERNEL); 8641 goto new_batch; 8642 } 8643 8644 if (batch_skb) { 8645 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES, 8646 NFT_CB(batch_skb).report, GFP_KERNEL); 8647 } 8648 8649 WARN_ON_ONCE(!list_empty(&nft_net->notify_list)); 8650 } 8651 8652 static int nf_tables_commit_audit_alloc(struct list_head *adl, 8653 struct nft_table *table) 8654 { 8655 struct nft_audit_data *adp; 8656 8657 list_for_each_entry(adp, adl, list) { 8658 if (adp->table == table) 8659 return 0; 8660 } 8661 adp = kzalloc(sizeof(*adp), GFP_KERNEL); 8662 if (!adp) 8663 return -ENOMEM; 8664 adp->table = table; 8665 list_add(&adp->list, adl); 8666 return 0; 8667 } 8668 8669 static void nf_tables_commit_audit_free(struct list_head *adl) 8670 { 8671 struct nft_audit_data *adp, *adn; 8672 8673 list_for_each_entry_safe(adp, adn, adl, list) { 8674 list_del(&adp->list); 8675 kfree(adp); 8676 } 8677 } 8678 8679 static void nf_tables_commit_audit_collect(struct list_head *adl, 8680 struct nft_table *table, u32 op) 8681 { 8682 struct nft_audit_data *adp; 8683 8684 list_for_each_entry(adp, adl, list) { 8685 if (adp->table == table) 8686 goto found; 8687 } 8688 WARN_ONCE(1, "table=%s not expected in commit list", table->name); 8689 return; 8690 found: 8691 adp->entries++; 8692 if (!adp->op || adp->op > op) 8693 adp->op = op; 8694 } 8695 8696 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22) 8697 8698 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation) 8699 { 8700 struct nft_audit_data *adp, *adn; 8701 char aubuf[AUNFTABLENAMELEN]; 8702 8703 list_for_each_entry_safe(adp, adn, adl, list) { 8704 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name, 8705 generation); 8706 audit_log_nfcfg(aubuf, adp->table->family, adp->entries, 8707 nft2audit_op[adp->op], GFP_KERNEL); 8708 list_del(&adp->list); 8709 kfree(adp); 8710 } 8711 } 8712 8713 static int nf_tables_commit(struct net *net, struct sk_buff *skb) 8714 { 8715 struct nftables_pernet *nft_net = nft_pernet(net); 8716 struct nft_trans *trans, *next; 8717 struct nft_trans_elem *te; 8718 struct nft_chain *chain; 8719 struct nft_table *table; 8720 LIST_HEAD(adl); 8721 int err; 8722 8723 if (list_empty(&nft_net->commit_list)) { 8724 mutex_unlock(&nft_net->commit_mutex); 8725 return 0; 8726 } 8727 8728 /* 0. Validate ruleset, otherwise roll back for error reporting. */ 8729 if (nf_tables_validate(net) < 0) 8730 return -EAGAIN; 8731 8732 err = nft_flow_rule_offload_commit(net); 8733 if (err < 0) 8734 return err; 8735 8736 /* 1. Allocate space for next generation rules_gen_X[] */ 8737 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8738 int ret; 8739 8740 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table); 8741 if (ret) { 8742 nf_tables_commit_chain_prepare_cancel(net); 8743 nf_tables_commit_audit_free(&adl); 8744 return ret; 8745 } 8746 if (trans->msg_type == NFT_MSG_NEWRULE || 8747 trans->msg_type == NFT_MSG_DELRULE) { 8748 chain = trans->ctx.chain; 8749 8750 ret = nf_tables_commit_chain_prepare(net, chain); 8751 if (ret < 0) { 8752 nf_tables_commit_chain_prepare_cancel(net); 8753 nf_tables_commit_audit_free(&adl); 8754 return ret; 8755 } 8756 } 8757 } 8758 8759 /* step 2. Make rules_gen_X visible to packet path */ 8760 list_for_each_entry(table, &nft_net->tables, list) { 8761 list_for_each_entry(chain, &table->chains, list) 8762 nf_tables_commit_chain(net, chain); 8763 } 8764 8765 /* 8766 * Bump generation counter, invalidate any dump in progress. 8767 * Cannot fail after this point. 8768 */ 8769 while (++nft_net->base_seq == 0) 8770 ; 8771 8772 /* step 3. Start new generation, rules_gen_X now in use. */ 8773 net->nft.gencursor = nft_gencursor_next(net); 8774 8775 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8776 nf_tables_commit_audit_collect(&adl, trans->ctx.table, 8777 trans->msg_type); 8778 switch (trans->msg_type) { 8779 case NFT_MSG_NEWTABLE: 8780 if (nft_trans_table_update(trans)) { 8781 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) { 8782 nft_trans_destroy(trans); 8783 break; 8784 } 8785 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT) 8786 nf_tables_table_disable(net, trans->ctx.table); 8787 8788 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE; 8789 } else { 8790 nft_clear(net, trans->ctx.table); 8791 } 8792 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); 8793 nft_trans_destroy(trans); 8794 break; 8795 case NFT_MSG_DELTABLE: 8796 list_del_rcu(&trans->ctx.table->list); 8797 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); 8798 break; 8799 case NFT_MSG_NEWCHAIN: 8800 if (nft_trans_chain_update(trans)) { 8801 nft_chain_commit_update(trans); 8802 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); 8803 /* trans destroyed after rcu grace period */ 8804 } else { 8805 nft_chain_commit_drop_policy(trans); 8806 nft_clear(net, trans->ctx.chain); 8807 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); 8808 nft_trans_destroy(trans); 8809 } 8810 break; 8811 case NFT_MSG_DELCHAIN: 8812 nft_chain_del(trans->ctx.chain); 8813 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); 8814 nf_tables_unregister_hook(trans->ctx.net, 8815 trans->ctx.table, 8816 trans->ctx.chain); 8817 break; 8818 case NFT_MSG_NEWRULE: 8819 nft_clear(trans->ctx.net, nft_trans_rule(trans)); 8820 nf_tables_rule_notify(&trans->ctx, 8821 nft_trans_rule(trans), 8822 NFT_MSG_NEWRULE); 8823 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 8824 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 8825 8826 nft_trans_destroy(trans); 8827 break; 8828 case NFT_MSG_DELRULE: 8829 list_del_rcu(&nft_trans_rule(trans)->list); 8830 nf_tables_rule_notify(&trans->ctx, 8831 nft_trans_rule(trans), 8832 NFT_MSG_DELRULE); 8833 nft_rule_expr_deactivate(&trans->ctx, 8834 nft_trans_rule(trans), 8835 NFT_TRANS_COMMIT); 8836 break; 8837 case NFT_MSG_NEWSET: 8838 nft_clear(net, nft_trans_set(trans)); 8839 /* This avoids hitting -EBUSY when deleting the table 8840 * from the transaction. 8841 */ 8842 if (nft_set_is_anonymous(nft_trans_set(trans)) && 8843 !list_empty(&nft_trans_set(trans)->bindings)) 8844 trans->ctx.table->use--; 8845 8846 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), 8847 NFT_MSG_NEWSET, GFP_KERNEL); 8848 nft_trans_destroy(trans); 8849 break; 8850 case NFT_MSG_DELSET: 8851 list_del_rcu(&nft_trans_set(trans)->list); 8852 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), 8853 NFT_MSG_DELSET, GFP_KERNEL); 8854 break; 8855 case NFT_MSG_NEWSETELEM: 8856 te = (struct nft_trans_elem *)trans->data; 8857 8858 nft_setelem_activate(net, te->set, &te->elem); 8859 nf_tables_setelem_notify(&trans->ctx, te->set, 8860 &te->elem, 8861 NFT_MSG_NEWSETELEM); 8862 nft_trans_destroy(trans); 8863 break; 8864 case NFT_MSG_DELSETELEM: 8865 te = (struct nft_trans_elem *)trans->data; 8866 8867 nf_tables_setelem_notify(&trans->ctx, te->set, 8868 &te->elem, 8869 NFT_MSG_DELSETELEM); 8870 nft_setelem_remove(net, te->set, &te->elem); 8871 if (!nft_setelem_is_catchall(te->set, &te->elem)) { 8872 atomic_dec(&te->set->nelems); 8873 te->set->ndeact--; 8874 } 8875 break; 8876 case NFT_MSG_NEWOBJ: 8877 if (nft_trans_obj_update(trans)) { 8878 nft_obj_commit_update(trans); 8879 nf_tables_obj_notify(&trans->ctx, 8880 nft_trans_obj(trans), 8881 NFT_MSG_NEWOBJ); 8882 } else { 8883 nft_clear(net, nft_trans_obj(trans)); 8884 nf_tables_obj_notify(&trans->ctx, 8885 nft_trans_obj(trans), 8886 NFT_MSG_NEWOBJ); 8887 nft_trans_destroy(trans); 8888 } 8889 break; 8890 case NFT_MSG_DELOBJ: 8891 nft_obj_del(nft_trans_obj(trans)); 8892 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), 8893 NFT_MSG_DELOBJ); 8894 break; 8895 case NFT_MSG_NEWFLOWTABLE: 8896 if (nft_trans_flowtable_update(trans)) { 8897 nft_trans_flowtable(trans)->data.flags = 8898 nft_trans_flowtable_flags(trans); 8899 nf_tables_flowtable_notify(&trans->ctx, 8900 nft_trans_flowtable(trans), 8901 &nft_trans_flowtable_hooks(trans), 8902 NFT_MSG_NEWFLOWTABLE); 8903 list_splice(&nft_trans_flowtable_hooks(trans), 8904 &nft_trans_flowtable(trans)->hook_list); 8905 } else { 8906 nft_clear(net, nft_trans_flowtable(trans)); 8907 nf_tables_flowtable_notify(&trans->ctx, 8908 nft_trans_flowtable(trans), 8909 &nft_trans_flowtable(trans)->hook_list, 8910 NFT_MSG_NEWFLOWTABLE); 8911 } 8912 nft_trans_destroy(trans); 8913 break; 8914 case NFT_MSG_DELFLOWTABLE: 8915 if (nft_trans_flowtable_update(trans)) { 8916 nf_tables_flowtable_notify(&trans->ctx, 8917 nft_trans_flowtable(trans), 8918 &nft_trans_flowtable_hooks(trans), 8919 NFT_MSG_DELFLOWTABLE); 8920 nft_unregister_flowtable_net_hooks(net, 8921 &nft_trans_flowtable_hooks(trans)); 8922 } else { 8923 list_del_rcu(&nft_trans_flowtable(trans)->list); 8924 nf_tables_flowtable_notify(&trans->ctx, 8925 nft_trans_flowtable(trans), 8926 &nft_trans_flowtable(trans)->hook_list, 8927 NFT_MSG_DELFLOWTABLE); 8928 nft_unregister_flowtable_net_hooks(net, 8929 &nft_trans_flowtable(trans)->hook_list); 8930 } 8931 break; 8932 } 8933 } 8934 8935 nft_commit_notify(net, NETLINK_CB(skb).portid); 8936 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); 8937 nf_tables_commit_audit_log(&adl, nft_net->base_seq); 8938 nf_tables_commit_release(net); 8939 8940 return 0; 8941 } 8942 8943 static void nf_tables_module_autoload(struct net *net) 8944 { 8945 struct nftables_pernet *nft_net = nft_pernet(net); 8946 struct nft_module_request *req, *next; 8947 LIST_HEAD(module_list); 8948 8949 list_splice_init(&nft_net->module_list, &module_list); 8950 mutex_unlock(&nft_net->commit_mutex); 8951 list_for_each_entry_safe(req, next, &module_list, list) { 8952 request_module("%s", req->module); 8953 req->done = true; 8954 } 8955 mutex_lock(&nft_net->commit_mutex); 8956 list_splice(&module_list, &nft_net->module_list); 8957 } 8958 8959 static void nf_tables_abort_release(struct nft_trans *trans) 8960 { 8961 switch (trans->msg_type) { 8962 case NFT_MSG_NEWTABLE: 8963 nf_tables_table_destroy(&trans->ctx); 8964 break; 8965 case NFT_MSG_NEWCHAIN: 8966 nf_tables_chain_destroy(&trans->ctx); 8967 break; 8968 case NFT_MSG_NEWRULE: 8969 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); 8970 break; 8971 case NFT_MSG_NEWSET: 8972 nft_set_destroy(&trans->ctx, nft_trans_set(trans)); 8973 break; 8974 case NFT_MSG_NEWSETELEM: 8975 nft_set_elem_destroy(nft_trans_elem_set(trans), 8976 nft_trans_elem(trans).priv, true); 8977 break; 8978 case NFT_MSG_NEWOBJ: 8979 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); 8980 break; 8981 case NFT_MSG_NEWFLOWTABLE: 8982 if (nft_trans_flowtable_update(trans)) 8983 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans)); 8984 else 8985 nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); 8986 break; 8987 } 8988 kfree(trans); 8989 } 8990 8991 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action) 8992 { 8993 struct nftables_pernet *nft_net = nft_pernet(net); 8994 struct nft_trans *trans, *next; 8995 struct nft_trans_elem *te; 8996 8997 if (action == NFNL_ABORT_VALIDATE && 8998 nf_tables_validate(net) < 0) 8999 return -EAGAIN; 9000 9001 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list, 9002 list) { 9003 switch (trans->msg_type) { 9004 case NFT_MSG_NEWTABLE: 9005 if (nft_trans_table_update(trans)) { 9006 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) { 9007 nft_trans_destroy(trans); 9008 break; 9009 } 9010 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) { 9011 nf_tables_table_disable(net, trans->ctx.table); 9012 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; 9013 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) { 9014 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT; 9015 } 9016 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE; 9017 nft_trans_destroy(trans); 9018 } else { 9019 list_del_rcu(&trans->ctx.table->list); 9020 } 9021 break; 9022 case NFT_MSG_DELTABLE: 9023 nft_clear(trans->ctx.net, trans->ctx.table); 9024 nft_trans_destroy(trans); 9025 break; 9026 case NFT_MSG_NEWCHAIN: 9027 if (nft_trans_chain_update(trans)) { 9028 free_percpu(nft_trans_chain_stats(trans)); 9029 kfree(nft_trans_chain_name(trans)); 9030 nft_trans_destroy(trans); 9031 } else { 9032 if (nft_chain_is_bound(trans->ctx.chain)) { 9033 nft_trans_destroy(trans); 9034 break; 9035 } 9036 trans->ctx.table->use--; 9037 nft_chain_del(trans->ctx.chain); 9038 nf_tables_unregister_hook(trans->ctx.net, 9039 trans->ctx.table, 9040 trans->ctx.chain); 9041 } 9042 break; 9043 case NFT_MSG_DELCHAIN: 9044 trans->ctx.table->use++; 9045 nft_clear(trans->ctx.net, trans->ctx.chain); 9046 nft_trans_destroy(trans); 9047 break; 9048 case NFT_MSG_NEWRULE: 9049 trans->ctx.chain->use--; 9050 list_del_rcu(&nft_trans_rule(trans)->list); 9051 nft_rule_expr_deactivate(&trans->ctx, 9052 nft_trans_rule(trans), 9053 NFT_TRANS_ABORT); 9054 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 9055 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 9056 break; 9057 case NFT_MSG_DELRULE: 9058 trans->ctx.chain->use++; 9059 nft_clear(trans->ctx.net, nft_trans_rule(trans)); 9060 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans)); 9061 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 9062 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 9063 9064 nft_trans_destroy(trans); 9065 break; 9066 case NFT_MSG_NEWSET: 9067 trans->ctx.table->use--; 9068 if (nft_trans_set_bound(trans)) { 9069 nft_trans_destroy(trans); 9070 break; 9071 } 9072 list_del_rcu(&nft_trans_set(trans)->list); 9073 break; 9074 case NFT_MSG_DELSET: 9075 trans->ctx.table->use++; 9076 nft_clear(trans->ctx.net, nft_trans_set(trans)); 9077 nft_trans_destroy(trans); 9078 break; 9079 case NFT_MSG_NEWSETELEM: 9080 if (nft_trans_elem_set_bound(trans)) { 9081 nft_trans_destroy(trans); 9082 break; 9083 } 9084 te = (struct nft_trans_elem *)trans->data; 9085 nft_setelem_remove(net, te->set, &te->elem); 9086 if (!nft_setelem_is_catchall(te->set, &te->elem)) 9087 atomic_dec(&te->set->nelems); 9088 break; 9089 case NFT_MSG_DELSETELEM: 9090 te = (struct nft_trans_elem *)trans->data; 9091 9092 nft_setelem_data_activate(net, te->set, &te->elem); 9093 nft_setelem_activate(net, te->set, &te->elem); 9094 if (!nft_setelem_is_catchall(te->set, &te->elem)) 9095 te->set->ndeact--; 9096 9097 nft_trans_destroy(trans); 9098 break; 9099 case NFT_MSG_NEWOBJ: 9100 if (nft_trans_obj_update(trans)) { 9101 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans)); 9102 nft_trans_destroy(trans); 9103 } else { 9104 trans->ctx.table->use--; 9105 nft_obj_del(nft_trans_obj(trans)); 9106 } 9107 break; 9108 case NFT_MSG_DELOBJ: 9109 trans->ctx.table->use++; 9110 nft_clear(trans->ctx.net, nft_trans_obj(trans)); 9111 nft_trans_destroy(trans); 9112 break; 9113 case NFT_MSG_NEWFLOWTABLE: 9114 if (nft_trans_flowtable_update(trans)) { 9115 nft_unregister_flowtable_net_hooks(net, 9116 &nft_trans_flowtable_hooks(trans)); 9117 } else { 9118 trans->ctx.table->use--; 9119 list_del_rcu(&nft_trans_flowtable(trans)->list); 9120 nft_unregister_flowtable_net_hooks(net, 9121 &nft_trans_flowtable(trans)->hook_list); 9122 } 9123 break; 9124 case NFT_MSG_DELFLOWTABLE: 9125 if (nft_trans_flowtable_update(trans)) { 9126 list_splice(&nft_trans_flowtable_hooks(trans), 9127 &nft_trans_flowtable(trans)->hook_list); 9128 } else { 9129 trans->ctx.table->use++; 9130 nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); 9131 } 9132 nft_trans_destroy(trans); 9133 break; 9134 } 9135 } 9136 9137 synchronize_rcu(); 9138 9139 list_for_each_entry_safe_reverse(trans, next, 9140 &nft_net->commit_list, list) { 9141 list_del(&trans->list); 9142 nf_tables_abort_release(trans); 9143 } 9144 9145 if (action == NFNL_ABORT_AUTOLOAD) 9146 nf_tables_module_autoload(net); 9147 else 9148 nf_tables_module_autoload_cleanup(net); 9149 9150 return 0; 9151 } 9152 9153 static void nf_tables_cleanup(struct net *net) 9154 { 9155 nft_validate_state_update(net, NFT_VALIDATE_SKIP); 9156 } 9157 9158 static int nf_tables_abort(struct net *net, struct sk_buff *skb, 9159 enum nfnl_abort_action action) 9160 { 9161 struct nftables_pernet *nft_net = nft_pernet(net); 9162 int ret = __nf_tables_abort(net, action); 9163 9164 mutex_unlock(&nft_net->commit_mutex); 9165 9166 return ret; 9167 } 9168 9169 static bool nf_tables_valid_genid(struct net *net, u32 genid) 9170 { 9171 struct nftables_pernet *nft_net = nft_pernet(net); 9172 bool genid_ok; 9173 9174 mutex_lock(&nft_net->commit_mutex); 9175 9176 genid_ok = genid == 0 || nft_net->base_seq == genid; 9177 if (!genid_ok) 9178 mutex_unlock(&nft_net->commit_mutex); 9179 9180 /* else, commit mutex has to be released by commit or abort function */ 9181 return genid_ok; 9182 } 9183 9184 static const struct nfnetlink_subsystem nf_tables_subsys = { 9185 .name = "nf_tables", 9186 .subsys_id = NFNL_SUBSYS_NFTABLES, 9187 .cb_count = NFT_MSG_MAX, 9188 .cb = nf_tables_cb, 9189 .commit = nf_tables_commit, 9190 .abort = nf_tables_abort, 9191 .cleanup = nf_tables_cleanup, 9192 .valid_genid = nf_tables_valid_genid, 9193 .owner = THIS_MODULE, 9194 }; 9195 9196 int nft_chain_validate_dependency(const struct nft_chain *chain, 9197 enum nft_chain_types type) 9198 { 9199 const struct nft_base_chain *basechain; 9200 9201 if (nft_is_base_chain(chain)) { 9202 basechain = nft_base_chain(chain); 9203 if (basechain->type->type != type) 9204 return -EOPNOTSUPP; 9205 } 9206 return 0; 9207 } 9208 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); 9209 9210 int nft_chain_validate_hooks(const struct nft_chain *chain, 9211 unsigned int hook_flags) 9212 { 9213 struct nft_base_chain *basechain; 9214 9215 if (nft_is_base_chain(chain)) { 9216 basechain = nft_base_chain(chain); 9217 9218 if ((1 << basechain->ops.hooknum) & hook_flags) 9219 return 0; 9220 9221 return -EOPNOTSUPP; 9222 } 9223 9224 return 0; 9225 } 9226 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); 9227 9228 /* 9229 * Loop detection - walk through the ruleset beginning at the destination chain 9230 * of a new jump until either the source chain is reached (loop) or all 9231 * reachable chains have been traversed. 9232 * 9233 * The loop check is performed whenever a new jump verdict is added to an 9234 * expression or verdict map or a verdict map is bound to a new chain. 9235 */ 9236 9237 static int nf_tables_check_loops(const struct nft_ctx *ctx, 9238 const struct nft_chain *chain); 9239 9240 static int nft_check_loops(const struct nft_ctx *ctx, 9241 const struct nft_set_ext *ext) 9242 { 9243 const struct nft_data *data; 9244 int ret; 9245 9246 data = nft_set_ext_data(ext); 9247 switch (data->verdict.code) { 9248 case NFT_JUMP: 9249 case NFT_GOTO: 9250 ret = nf_tables_check_loops(ctx, data->verdict.chain); 9251 break; 9252 default: 9253 ret = 0; 9254 break; 9255 } 9256 9257 return ret; 9258 } 9259 9260 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, 9261 struct nft_set *set, 9262 const struct nft_set_iter *iter, 9263 struct nft_set_elem *elem) 9264 { 9265 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 9266 9267 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 9268 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) 9269 return 0; 9270 9271 return nft_check_loops(ctx, ext); 9272 } 9273 9274 static int nft_set_catchall_loops(const struct nft_ctx *ctx, 9275 struct nft_set *set) 9276 { 9277 u8 genmask = nft_genmask_next(ctx->net); 9278 struct nft_set_elem_catchall *catchall; 9279 struct nft_set_ext *ext; 9280 int ret = 0; 9281 9282 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 9283 ext = nft_set_elem_ext(set, catchall->elem); 9284 if (!nft_set_elem_active(ext, genmask)) 9285 continue; 9286 9287 ret = nft_check_loops(ctx, ext); 9288 if (ret < 0) 9289 return ret; 9290 } 9291 9292 return ret; 9293 } 9294 9295 static int nf_tables_check_loops(const struct nft_ctx *ctx, 9296 const struct nft_chain *chain) 9297 { 9298 const struct nft_rule *rule; 9299 const struct nft_expr *expr, *last; 9300 struct nft_set *set; 9301 struct nft_set_binding *binding; 9302 struct nft_set_iter iter; 9303 9304 if (ctx->chain == chain) 9305 return -ELOOP; 9306 9307 list_for_each_entry(rule, &chain->rules, list) { 9308 nft_rule_for_each_expr(expr, last, rule) { 9309 struct nft_immediate_expr *priv; 9310 const struct nft_data *data; 9311 int err; 9312 9313 if (strcmp(expr->ops->type->name, "immediate")) 9314 continue; 9315 9316 priv = nft_expr_priv(expr); 9317 if (priv->dreg != NFT_REG_VERDICT) 9318 continue; 9319 9320 data = &priv->data; 9321 switch (data->verdict.code) { 9322 case NFT_JUMP: 9323 case NFT_GOTO: 9324 err = nf_tables_check_loops(ctx, 9325 data->verdict.chain); 9326 if (err < 0) 9327 return err; 9328 break; 9329 default: 9330 break; 9331 } 9332 } 9333 } 9334 9335 list_for_each_entry(set, &ctx->table->sets, list) { 9336 if (!nft_is_active_next(ctx->net, set)) 9337 continue; 9338 if (!(set->flags & NFT_SET_MAP) || 9339 set->dtype != NFT_DATA_VERDICT) 9340 continue; 9341 9342 list_for_each_entry(binding, &set->bindings, list) { 9343 if (!(binding->flags & NFT_SET_MAP) || 9344 binding->chain != chain) 9345 continue; 9346 9347 iter.genmask = nft_genmask_next(ctx->net); 9348 iter.skip = 0; 9349 iter.count = 0; 9350 iter.err = 0; 9351 iter.fn = nf_tables_loop_check_setelem; 9352 9353 set->ops->walk(ctx, set, &iter); 9354 if (!iter.err) 9355 iter.err = nft_set_catchall_loops(ctx, set); 9356 9357 if (iter.err < 0) 9358 return iter.err; 9359 } 9360 } 9361 9362 return 0; 9363 } 9364 9365 /** 9366 * nft_parse_u32_check - fetch u32 attribute and check for maximum value 9367 * 9368 * @attr: netlink attribute to fetch value from 9369 * @max: maximum value to be stored in dest 9370 * @dest: pointer to the variable 9371 * 9372 * Parse, check and store a given u32 netlink attribute into variable. 9373 * This function returns -ERANGE if the value goes over maximum value. 9374 * Otherwise a 0 is returned and the attribute value is stored in the 9375 * destination variable. 9376 */ 9377 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) 9378 { 9379 u32 val; 9380 9381 val = ntohl(nla_get_be32(attr)); 9382 if (val > max) 9383 return -ERANGE; 9384 9385 *dest = val; 9386 return 0; 9387 } 9388 EXPORT_SYMBOL_GPL(nft_parse_u32_check); 9389 9390 static int nft_parse_register(const struct nlattr *attr, u32 *preg) 9391 { 9392 unsigned int reg; 9393 9394 reg = ntohl(nla_get_be32(attr)); 9395 switch (reg) { 9396 case NFT_REG_VERDICT...NFT_REG_4: 9397 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE; 9398 break; 9399 case NFT_REG32_00...NFT_REG32_15: 9400 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; 9401 break; 9402 default: 9403 return -ERANGE; 9404 } 9405 9406 return 0; 9407 } 9408 9409 /** 9410 * nft_dump_register - dump a register value to a netlink attribute 9411 * 9412 * @skb: socket buffer 9413 * @attr: attribute number 9414 * @reg: register number 9415 * 9416 * Construct a netlink attribute containing the register number. For 9417 * compatibility reasons, register numbers being a multiple of 4 are 9418 * translated to the corresponding 128 bit register numbers. 9419 */ 9420 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) 9421 { 9422 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) 9423 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); 9424 else 9425 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; 9426 9427 return nla_put_be32(skb, attr, htonl(reg)); 9428 } 9429 EXPORT_SYMBOL_GPL(nft_dump_register); 9430 9431 static int nft_validate_register_load(enum nft_registers reg, unsigned int len) 9432 { 9433 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) 9434 return -EINVAL; 9435 if (len == 0) 9436 return -EINVAL; 9437 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data)) 9438 return -ERANGE; 9439 9440 return 0; 9441 } 9442 9443 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len) 9444 { 9445 u32 reg; 9446 int err; 9447 9448 err = nft_parse_register(attr, ®); 9449 if (err < 0) 9450 return err; 9451 9452 err = nft_validate_register_load(reg, len); 9453 if (err < 0) 9454 return err; 9455 9456 *sreg = reg; 9457 return 0; 9458 } 9459 EXPORT_SYMBOL_GPL(nft_parse_register_load); 9460 9461 static int nft_validate_register_store(const struct nft_ctx *ctx, 9462 enum nft_registers reg, 9463 const struct nft_data *data, 9464 enum nft_data_types type, 9465 unsigned int len) 9466 { 9467 int err; 9468 9469 switch (reg) { 9470 case NFT_REG_VERDICT: 9471 if (type != NFT_DATA_VERDICT) 9472 return -EINVAL; 9473 9474 if (data != NULL && 9475 (data->verdict.code == NFT_GOTO || 9476 data->verdict.code == NFT_JUMP)) { 9477 err = nf_tables_check_loops(ctx, data->verdict.chain); 9478 if (err < 0) 9479 return err; 9480 } 9481 9482 return 0; 9483 default: 9484 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) 9485 return -EINVAL; 9486 if (len == 0) 9487 return -EINVAL; 9488 if (reg * NFT_REG32_SIZE + len > 9489 sizeof_field(struct nft_regs, data)) 9490 return -ERANGE; 9491 9492 if (data != NULL && type != NFT_DATA_VALUE) 9493 return -EINVAL; 9494 return 0; 9495 } 9496 } 9497 9498 int nft_parse_register_store(const struct nft_ctx *ctx, 9499 const struct nlattr *attr, u8 *dreg, 9500 const struct nft_data *data, 9501 enum nft_data_types type, unsigned int len) 9502 { 9503 int err; 9504 u32 reg; 9505 9506 err = nft_parse_register(attr, ®); 9507 if (err < 0) 9508 return err; 9509 9510 err = nft_validate_register_store(ctx, reg, data, type, len); 9511 if (err < 0) 9512 return err; 9513 9514 *dreg = reg; 9515 return 0; 9516 } 9517 EXPORT_SYMBOL_GPL(nft_parse_register_store); 9518 9519 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { 9520 [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, 9521 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, 9522 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 9523 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 }, 9524 }; 9525 9526 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, 9527 struct nft_data_desc *desc, const struct nlattr *nla) 9528 { 9529 u8 genmask = nft_genmask_next(ctx->net); 9530 struct nlattr *tb[NFTA_VERDICT_MAX + 1]; 9531 struct nft_chain *chain; 9532 int err; 9533 9534 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla, 9535 nft_verdict_policy, NULL); 9536 if (err < 0) 9537 return err; 9538 9539 if (!tb[NFTA_VERDICT_CODE]) 9540 return -EINVAL; 9541 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); 9542 9543 switch (data->verdict.code) { 9544 default: 9545 switch (data->verdict.code & NF_VERDICT_MASK) { 9546 case NF_ACCEPT: 9547 case NF_DROP: 9548 case NF_QUEUE: 9549 break; 9550 default: 9551 return -EINVAL; 9552 } 9553 fallthrough; 9554 case NFT_CONTINUE: 9555 case NFT_BREAK: 9556 case NFT_RETURN: 9557 break; 9558 case NFT_JUMP: 9559 case NFT_GOTO: 9560 if (tb[NFTA_VERDICT_CHAIN]) { 9561 chain = nft_chain_lookup(ctx->net, ctx->table, 9562 tb[NFTA_VERDICT_CHAIN], 9563 genmask); 9564 } else if (tb[NFTA_VERDICT_CHAIN_ID]) { 9565 chain = nft_chain_lookup_byid(ctx->net, 9566 tb[NFTA_VERDICT_CHAIN_ID]); 9567 if (IS_ERR(chain)) 9568 return PTR_ERR(chain); 9569 } else { 9570 return -EINVAL; 9571 } 9572 9573 if (IS_ERR(chain)) 9574 return PTR_ERR(chain); 9575 if (nft_is_base_chain(chain)) 9576 return -EOPNOTSUPP; 9577 9578 chain->use++; 9579 data->verdict.chain = chain; 9580 break; 9581 } 9582 9583 desc->len = sizeof(data->verdict); 9584 desc->type = NFT_DATA_VERDICT; 9585 return 0; 9586 } 9587 9588 static void nft_verdict_uninit(const struct nft_data *data) 9589 { 9590 struct nft_chain *chain; 9591 struct nft_rule *rule; 9592 9593 switch (data->verdict.code) { 9594 case NFT_JUMP: 9595 case NFT_GOTO: 9596 chain = data->verdict.chain; 9597 chain->use--; 9598 9599 if (!nft_chain_is_bound(chain)) 9600 break; 9601 9602 chain->table->use--; 9603 list_for_each_entry(rule, &chain->rules, list) 9604 chain->use--; 9605 9606 nft_chain_del(chain); 9607 break; 9608 } 9609 } 9610 9611 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) 9612 { 9613 struct nlattr *nest; 9614 9615 nest = nla_nest_start_noflag(skb, type); 9616 if (!nest) 9617 goto nla_put_failure; 9618 9619 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) 9620 goto nla_put_failure; 9621 9622 switch (v->code) { 9623 case NFT_JUMP: 9624 case NFT_GOTO: 9625 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, 9626 v->chain->name)) 9627 goto nla_put_failure; 9628 } 9629 nla_nest_end(skb, nest); 9630 return 0; 9631 9632 nla_put_failure: 9633 return -1; 9634 } 9635 9636 static int nft_value_init(const struct nft_ctx *ctx, 9637 struct nft_data *data, unsigned int size, 9638 struct nft_data_desc *desc, const struct nlattr *nla) 9639 { 9640 unsigned int len; 9641 9642 len = nla_len(nla); 9643 if (len == 0) 9644 return -EINVAL; 9645 if (len > size) 9646 return -EOVERFLOW; 9647 9648 nla_memcpy(data->data, nla, len); 9649 desc->type = NFT_DATA_VALUE; 9650 desc->len = len; 9651 return 0; 9652 } 9653 9654 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, 9655 unsigned int len) 9656 { 9657 return nla_put(skb, NFTA_DATA_VALUE, len, data->data); 9658 } 9659 9660 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { 9661 [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, 9662 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, 9663 }; 9664 9665 /** 9666 * nft_data_init - parse nf_tables data netlink attributes 9667 * 9668 * @ctx: context of the expression using the data 9669 * @data: destination struct nft_data 9670 * @size: maximum data length 9671 * @desc: data description 9672 * @nla: netlink attribute containing data 9673 * 9674 * Parse the netlink data attributes and initialize a struct nft_data. 9675 * The type and length of data are returned in the data description. 9676 * 9677 * The caller can indicate that it only wants to accept data of type 9678 * NFT_DATA_VALUE by passing NULL for the ctx argument. 9679 */ 9680 int nft_data_init(const struct nft_ctx *ctx, 9681 struct nft_data *data, unsigned int size, 9682 struct nft_data_desc *desc, const struct nlattr *nla) 9683 { 9684 struct nlattr *tb[NFTA_DATA_MAX + 1]; 9685 int err; 9686 9687 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla, 9688 nft_data_policy, NULL); 9689 if (err < 0) 9690 return err; 9691 9692 if (tb[NFTA_DATA_VALUE]) 9693 return nft_value_init(ctx, data, size, desc, 9694 tb[NFTA_DATA_VALUE]); 9695 if (tb[NFTA_DATA_VERDICT] && ctx != NULL) 9696 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); 9697 return -EINVAL; 9698 } 9699 EXPORT_SYMBOL_GPL(nft_data_init); 9700 9701 /** 9702 * nft_data_release - release a nft_data item 9703 * 9704 * @data: struct nft_data to release 9705 * @type: type of data 9706 * 9707 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, 9708 * all others need to be released by calling this function. 9709 */ 9710 void nft_data_release(const struct nft_data *data, enum nft_data_types type) 9711 { 9712 if (type < NFT_DATA_VERDICT) 9713 return; 9714 switch (type) { 9715 case NFT_DATA_VERDICT: 9716 return nft_verdict_uninit(data); 9717 default: 9718 WARN_ON(1); 9719 } 9720 } 9721 EXPORT_SYMBOL_GPL(nft_data_release); 9722 9723 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 9724 enum nft_data_types type, unsigned int len) 9725 { 9726 struct nlattr *nest; 9727 int err; 9728 9729 nest = nla_nest_start_noflag(skb, attr); 9730 if (nest == NULL) 9731 return -1; 9732 9733 switch (type) { 9734 case NFT_DATA_VALUE: 9735 err = nft_value_dump(skb, data, len); 9736 break; 9737 case NFT_DATA_VERDICT: 9738 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); 9739 break; 9740 default: 9741 err = -EINVAL; 9742 WARN_ON(1); 9743 } 9744 9745 nla_nest_end(skb, nest); 9746 return err; 9747 } 9748 EXPORT_SYMBOL_GPL(nft_data_dump); 9749 9750 int __nft_release_basechain(struct nft_ctx *ctx) 9751 { 9752 struct nft_rule *rule, *nr; 9753 9754 if (WARN_ON(!nft_is_base_chain(ctx->chain))) 9755 return 0; 9756 9757 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); 9758 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { 9759 list_del(&rule->list); 9760 ctx->chain->use--; 9761 nf_tables_rule_release(ctx, rule); 9762 } 9763 nft_chain_del(ctx->chain); 9764 ctx->table->use--; 9765 nf_tables_chain_destroy(ctx); 9766 9767 return 0; 9768 } 9769 EXPORT_SYMBOL_GPL(__nft_release_basechain); 9770 9771 static void __nft_release_hook(struct net *net, struct nft_table *table) 9772 { 9773 struct nft_flowtable *flowtable; 9774 struct nft_chain *chain; 9775 9776 list_for_each_entry(chain, &table->chains, list) 9777 __nf_tables_unregister_hook(net, table, chain, true); 9778 list_for_each_entry(flowtable, &table->flowtables, list) 9779 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list, 9780 true); 9781 } 9782 9783 static void __nft_release_hooks(struct net *net) 9784 { 9785 struct nftables_pernet *nft_net = nft_pernet(net); 9786 struct nft_table *table; 9787 9788 list_for_each_entry(table, &nft_net->tables, list) { 9789 if (nft_table_has_owner(table)) 9790 continue; 9791 9792 __nft_release_hook(net, table); 9793 } 9794 } 9795 9796 static void __nft_release_table(struct net *net, struct nft_table *table) 9797 { 9798 struct nft_flowtable *flowtable, *nf; 9799 struct nft_chain *chain, *nc; 9800 struct nft_object *obj, *ne; 9801 struct nft_rule *rule, *nr; 9802 struct nft_set *set, *ns; 9803 struct nft_ctx ctx = { 9804 .net = net, 9805 .family = NFPROTO_NETDEV, 9806 }; 9807 9808 ctx.family = table->family; 9809 ctx.table = table; 9810 list_for_each_entry(chain, &table->chains, list) { 9811 ctx.chain = chain; 9812 list_for_each_entry_safe(rule, nr, &chain->rules, list) { 9813 list_del(&rule->list); 9814 chain->use--; 9815 nf_tables_rule_release(&ctx, rule); 9816 } 9817 } 9818 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { 9819 list_del(&flowtable->list); 9820 table->use--; 9821 nf_tables_flowtable_destroy(flowtable); 9822 } 9823 list_for_each_entry_safe(set, ns, &table->sets, list) { 9824 list_del(&set->list); 9825 table->use--; 9826 nft_set_destroy(&ctx, set); 9827 } 9828 list_for_each_entry_safe(obj, ne, &table->objects, list) { 9829 nft_obj_del(obj); 9830 table->use--; 9831 nft_obj_destroy(&ctx, obj); 9832 } 9833 list_for_each_entry_safe(chain, nc, &table->chains, list) { 9834 ctx.chain = chain; 9835 nft_chain_del(chain); 9836 table->use--; 9837 nf_tables_chain_destroy(&ctx); 9838 } 9839 nf_tables_table_destroy(&ctx); 9840 } 9841 9842 static void __nft_release_tables(struct net *net) 9843 { 9844 struct nftables_pernet *nft_net = nft_pernet(net); 9845 struct nft_table *table, *nt; 9846 9847 list_for_each_entry_safe(table, nt, &nft_net->tables, list) { 9848 if (nft_table_has_owner(table)) 9849 continue; 9850 9851 list_del(&table->list); 9852 9853 __nft_release_table(net, table); 9854 } 9855 } 9856 9857 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event, 9858 void *ptr) 9859 { 9860 struct nft_table *table, *to_delete[8]; 9861 struct nftables_pernet *nft_net; 9862 struct netlink_notify *n = ptr; 9863 struct net *net = n->net; 9864 unsigned int deleted; 9865 bool restart = false; 9866 9867 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER) 9868 return NOTIFY_DONE; 9869 9870 nft_net = nft_pernet(net); 9871 deleted = 0; 9872 mutex_lock(&nft_net->commit_mutex); 9873 again: 9874 list_for_each_entry(table, &nft_net->tables, list) { 9875 if (nft_table_has_owner(table) && 9876 n->portid == table->nlpid) { 9877 __nft_release_hook(net, table); 9878 list_del_rcu(&table->list); 9879 to_delete[deleted++] = table; 9880 if (deleted >= ARRAY_SIZE(to_delete)) 9881 break; 9882 } 9883 } 9884 if (deleted) { 9885 restart = deleted >= ARRAY_SIZE(to_delete); 9886 synchronize_rcu(); 9887 while (deleted) 9888 __nft_release_table(net, to_delete[--deleted]); 9889 9890 if (restart) 9891 goto again; 9892 } 9893 mutex_unlock(&nft_net->commit_mutex); 9894 9895 return NOTIFY_DONE; 9896 } 9897 9898 static struct notifier_block nft_nl_notifier = { 9899 .notifier_call = nft_rcv_nl_event, 9900 }; 9901 9902 static int __net_init nf_tables_init_net(struct net *net) 9903 { 9904 struct nftables_pernet *nft_net = nft_pernet(net); 9905 9906 INIT_LIST_HEAD(&nft_net->tables); 9907 INIT_LIST_HEAD(&nft_net->commit_list); 9908 INIT_LIST_HEAD(&nft_net->module_list); 9909 INIT_LIST_HEAD(&nft_net->notify_list); 9910 mutex_init(&nft_net->commit_mutex); 9911 nft_net->base_seq = 1; 9912 nft_net->validate_state = NFT_VALIDATE_SKIP; 9913 9914 return 0; 9915 } 9916 9917 static void __net_exit nf_tables_pre_exit_net(struct net *net) 9918 { 9919 struct nftables_pernet *nft_net = nft_pernet(net); 9920 9921 mutex_lock(&nft_net->commit_mutex); 9922 __nft_release_hooks(net); 9923 mutex_unlock(&nft_net->commit_mutex); 9924 } 9925 9926 static void __net_exit nf_tables_exit_net(struct net *net) 9927 { 9928 struct nftables_pernet *nft_net = nft_pernet(net); 9929 9930 mutex_lock(&nft_net->commit_mutex); 9931 if (!list_empty(&nft_net->commit_list)) 9932 __nf_tables_abort(net, NFNL_ABORT_NONE); 9933 __nft_release_tables(net); 9934 mutex_unlock(&nft_net->commit_mutex); 9935 WARN_ON_ONCE(!list_empty(&nft_net->tables)); 9936 WARN_ON_ONCE(!list_empty(&nft_net->module_list)); 9937 WARN_ON_ONCE(!list_empty(&nft_net->notify_list)); 9938 } 9939 9940 static struct pernet_operations nf_tables_net_ops = { 9941 .init = nf_tables_init_net, 9942 .pre_exit = nf_tables_pre_exit_net, 9943 .exit = nf_tables_exit_net, 9944 .id = &nf_tables_net_id, 9945 .size = sizeof(struct nftables_pernet), 9946 }; 9947 9948 static int __init nf_tables_module_init(void) 9949 { 9950 int err; 9951 9952 err = register_pernet_subsys(&nf_tables_net_ops); 9953 if (err < 0) 9954 return err; 9955 9956 err = nft_chain_filter_init(); 9957 if (err < 0) 9958 goto err_chain_filter; 9959 9960 err = nf_tables_core_module_init(); 9961 if (err < 0) 9962 goto err_core_module; 9963 9964 err = register_netdevice_notifier(&nf_tables_flowtable_notifier); 9965 if (err < 0) 9966 goto err_netdev_notifier; 9967 9968 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params); 9969 if (err < 0) 9970 goto err_rht_objname; 9971 9972 err = nft_offload_init(); 9973 if (err < 0) 9974 goto err_offload; 9975 9976 err = netlink_register_notifier(&nft_nl_notifier); 9977 if (err < 0) 9978 goto err_netlink_notifier; 9979 9980 /* must be last */ 9981 err = nfnetlink_subsys_register(&nf_tables_subsys); 9982 if (err < 0) 9983 goto err_nfnl_subsys; 9984 9985 nft_chain_route_init(); 9986 9987 return err; 9988 9989 err_nfnl_subsys: 9990 netlink_unregister_notifier(&nft_nl_notifier); 9991 err_netlink_notifier: 9992 nft_offload_exit(); 9993 err_offload: 9994 rhltable_destroy(&nft_objname_ht); 9995 err_rht_objname: 9996 unregister_netdevice_notifier(&nf_tables_flowtable_notifier); 9997 err_netdev_notifier: 9998 nf_tables_core_module_exit(); 9999 err_core_module: 10000 nft_chain_filter_fini(); 10001 err_chain_filter: 10002 unregister_pernet_subsys(&nf_tables_net_ops); 10003 return err; 10004 } 10005 10006 static void __exit nf_tables_module_exit(void) 10007 { 10008 nfnetlink_subsys_unregister(&nf_tables_subsys); 10009 netlink_unregister_notifier(&nft_nl_notifier); 10010 nft_offload_exit(); 10011 unregister_netdevice_notifier(&nf_tables_flowtable_notifier); 10012 nft_chain_filter_fini(); 10013 nft_chain_route_fini(); 10014 unregister_pernet_subsys(&nf_tables_net_ops); 10015 cancel_work_sync(&trans_destroy_work); 10016 rcu_barrier(); 10017 rhltable_destroy(&nft_objname_ht); 10018 nf_tables_core_module_exit(); 10019 } 10020 10021 module_init(nf_tables_module_init); 10022 module_exit(nf_tables_module_exit); 10023 10024 MODULE_LICENSE("GPL"); 10025 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 10026 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); 10027