1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net> 4 * 5 * Development of this code funded by Astaro AG (http://www.astaro.com/) 6 */ 7 8 #include <linux/module.h> 9 #include <linux/init.h> 10 #include <linux/list.h> 11 #include <linux/skbuff.h> 12 #include <linux/netlink.h> 13 #include <linux/vmalloc.h> 14 #include <linux/rhashtable.h> 15 #include <linux/audit.h> 16 #include <linux/netfilter.h> 17 #include <linux/netfilter/nfnetlink.h> 18 #include <linux/netfilter/nf_tables.h> 19 #include <net/netfilter/nf_flow_table.h> 20 #include <net/netfilter/nf_tables_core.h> 21 #include <net/netfilter/nf_tables.h> 22 #include <net/netfilter/nf_tables_offload.h> 23 #include <net/net_namespace.h> 24 #include <net/sock.h> 25 26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-")) 27 28 unsigned int nf_tables_net_id __read_mostly; 29 30 static LIST_HEAD(nf_tables_expressions); 31 static LIST_HEAD(nf_tables_objects); 32 static LIST_HEAD(nf_tables_flowtables); 33 static LIST_HEAD(nf_tables_destroy_list); 34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock); 35 36 enum { 37 NFT_VALIDATE_SKIP = 0, 38 NFT_VALIDATE_NEED, 39 NFT_VALIDATE_DO, 40 }; 41 42 static struct rhltable nft_objname_ht; 43 44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed); 45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed); 46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *); 47 48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed); 49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed); 50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *); 51 52 static const struct rhashtable_params nft_chain_ht_params = { 53 .head_offset = offsetof(struct nft_chain, rhlhead), 54 .key_offset = offsetof(struct nft_chain, name), 55 .hashfn = nft_chain_hash, 56 .obj_hashfn = nft_chain_hash_obj, 57 .obj_cmpfn = nft_chain_hash_cmp, 58 .automatic_shrinking = true, 59 }; 60 61 static const struct rhashtable_params nft_objname_ht_params = { 62 .head_offset = offsetof(struct nft_object, rhlhead), 63 .key_offset = offsetof(struct nft_object, key), 64 .hashfn = nft_objname_hash, 65 .obj_hashfn = nft_objname_hash_obj, 66 .obj_cmpfn = nft_objname_hash_cmp, 67 .automatic_shrinking = true, 68 }; 69 70 struct nft_audit_data { 71 struct nft_table *table; 72 int entries; 73 int op; 74 struct list_head list; 75 }; 76 77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types 78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER, 79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID, 80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER, 81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER, 82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID, 83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER, 84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER, 85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID, 86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER, 87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER, 88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID, 89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER, 90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER, 91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID, 92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER, 93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER, 94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID, 95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID, 96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER, 97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID, 98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER, 99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET, 100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER, 101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID, 102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, 103 }; 104 105 static void nft_validate_state_update(struct net *net, u8 new_validate_state) 106 { 107 struct nftables_pernet *nft_net = nft_pernet(net); 108 109 switch (nft_net->validate_state) { 110 case NFT_VALIDATE_SKIP: 111 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO); 112 break; 113 case NFT_VALIDATE_NEED: 114 break; 115 case NFT_VALIDATE_DO: 116 if (new_validate_state == NFT_VALIDATE_NEED) 117 return; 118 } 119 120 nft_net->validate_state = new_validate_state; 121 } 122 static void nf_tables_trans_destroy_work(struct work_struct *w); 123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work); 124 125 static void nft_ctx_init(struct nft_ctx *ctx, 126 struct net *net, 127 const struct sk_buff *skb, 128 const struct nlmsghdr *nlh, 129 u8 family, 130 struct nft_table *table, 131 struct nft_chain *chain, 132 const struct nlattr * const *nla) 133 { 134 ctx->net = net; 135 ctx->family = family; 136 ctx->level = 0; 137 ctx->table = table; 138 ctx->chain = chain; 139 ctx->nla = nla; 140 ctx->portid = NETLINK_CB(skb).portid; 141 ctx->report = nlmsg_report(nlh); 142 ctx->flags = nlh->nlmsg_flags; 143 ctx->seq = nlh->nlmsg_seq; 144 } 145 146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx, 147 int msg_type, u32 size, gfp_t gfp) 148 { 149 struct nft_trans *trans; 150 151 trans = kzalloc(sizeof(struct nft_trans) + size, gfp); 152 if (trans == NULL) 153 return NULL; 154 155 INIT_LIST_HEAD(&trans->list); 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 strscpy(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 = READ_ONCE(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 = ++nft_net->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 = READ_ONCE(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 list_splice_init(&basechain->hook_list, &hook->list); 2171 return -EOPNOTSUPP; 2172 } 2173 2174 flow_block_init(&basechain->flow_block); 2175 2176 return 0; 2177 } 2178 2179 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain) 2180 { 2181 int err; 2182 2183 err = rhltable_insert_key(&table->chains_ht, chain->name, 2184 &chain->rhlhead, nft_chain_ht_params); 2185 if (err) 2186 return err; 2187 2188 list_add_tail_rcu(&chain->list, &table->chains); 2189 2190 return 0; 2191 } 2192 2193 static u64 chain_id; 2194 2195 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask, 2196 u8 policy, u32 flags, 2197 struct netlink_ext_ack *extack) 2198 { 2199 const struct nlattr * const *nla = ctx->nla; 2200 struct nft_table *table = ctx->table; 2201 struct nft_base_chain *basechain; 2202 struct net *net = ctx->net; 2203 char name[NFT_NAME_MAXLEN]; 2204 struct nft_rule_blob *blob; 2205 struct nft_trans *trans; 2206 struct nft_chain *chain; 2207 unsigned int data_size; 2208 int err; 2209 2210 if (table->use == UINT_MAX) 2211 return -EOVERFLOW; 2212 2213 if (nla[NFTA_CHAIN_HOOK]) { 2214 struct nft_stats __percpu *stats = NULL; 2215 struct nft_chain_hook hook; 2216 2217 if (flags & NFT_CHAIN_BINDING) 2218 return -EOPNOTSUPP; 2219 2220 err = nft_chain_parse_hook(net, nla, &hook, family, extack, 2221 true); 2222 if (err < 0) 2223 return err; 2224 2225 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT); 2226 if (basechain == NULL) { 2227 nft_chain_release_hook(&hook); 2228 return -ENOMEM; 2229 } 2230 chain = &basechain->chain; 2231 2232 if (nla[NFTA_CHAIN_COUNTERS]) { 2233 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); 2234 if (IS_ERR(stats)) { 2235 nft_chain_release_hook(&hook); 2236 kfree(basechain); 2237 return PTR_ERR(stats); 2238 } 2239 rcu_assign_pointer(basechain->stats, stats); 2240 } 2241 2242 err = nft_basechain_init(basechain, family, &hook, flags); 2243 if (err < 0) { 2244 nft_chain_release_hook(&hook); 2245 kfree(basechain); 2246 free_percpu(stats); 2247 return err; 2248 } 2249 if (stats) 2250 static_branch_inc(&nft_counters_enabled); 2251 } else { 2252 if (flags & NFT_CHAIN_BASE) 2253 return -EINVAL; 2254 if (flags & NFT_CHAIN_HW_OFFLOAD) 2255 return -EOPNOTSUPP; 2256 2257 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT); 2258 if (chain == NULL) 2259 return -ENOMEM; 2260 2261 chain->flags = flags; 2262 } 2263 ctx->chain = chain; 2264 2265 INIT_LIST_HEAD(&chain->rules); 2266 chain->handle = nf_tables_alloc_handle(table); 2267 chain->table = table; 2268 2269 if (nla[NFTA_CHAIN_NAME]) { 2270 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT); 2271 } else { 2272 if (!(flags & NFT_CHAIN_BINDING)) { 2273 err = -EINVAL; 2274 goto err_destroy_chain; 2275 } 2276 2277 snprintf(name, sizeof(name), "__chain%llu", ++chain_id); 2278 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT); 2279 } 2280 2281 if (!chain->name) { 2282 err = -ENOMEM; 2283 goto err_destroy_chain; 2284 } 2285 2286 if (nla[NFTA_CHAIN_USERDATA]) { 2287 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT); 2288 if (chain->udata == NULL) { 2289 err = -ENOMEM; 2290 goto err_destroy_chain; 2291 } 2292 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]); 2293 } 2294 2295 data_size = offsetof(struct nft_rule_dp, data); /* last rule */ 2296 blob = nf_tables_chain_alloc_rules(data_size); 2297 if (!blob) { 2298 err = -ENOMEM; 2299 goto err_destroy_chain; 2300 } 2301 2302 RCU_INIT_POINTER(chain->blob_gen_0, blob); 2303 RCU_INIT_POINTER(chain->blob_gen_1, blob); 2304 2305 err = nf_tables_register_hook(net, table, chain); 2306 if (err < 0) 2307 goto err_destroy_chain; 2308 2309 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN); 2310 if (IS_ERR(trans)) { 2311 err = PTR_ERR(trans); 2312 goto err_unregister_hook; 2313 } 2314 2315 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET; 2316 if (nft_is_base_chain(chain)) 2317 nft_trans_chain_policy(trans) = policy; 2318 2319 err = nft_chain_add(table, chain); 2320 if (err < 0) { 2321 nft_trans_destroy(trans); 2322 goto err_unregister_hook; 2323 } 2324 2325 table->use++; 2326 2327 return 0; 2328 err_unregister_hook: 2329 nf_tables_unregister_hook(net, table, chain); 2330 err_destroy_chain: 2331 nf_tables_chain_destroy(ctx); 2332 2333 return err; 2334 } 2335 2336 static bool nft_hook_list_equal(struct list_head *hook_list1, 2337 struct list_head *hook_list2) 2338 { 2339 struct nft_hook *hook; 2340 int n = 0, m = 0; 2341 2342 n = 0; 2343 list_for_each_entry(hook, hook_list2, list) { 2344 if (!nft_hook_list_find(hook_list1, hook)) 2345 return false; 2346 2347 n++; 2348 } 2349 list_for_each_entry(hook, hook_list1, list) 2350 m++; 2351 2352 return n == m; 2353 } 2354 2355 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy, 2356 u32 flags, const struct nlattr *attr, 2357 struct netlink_ext_ack *extack) 2358 { 2359 const struct nlattr * const *nla = ctx->nla; 2360 struct nft_table *table = ctx->table; 2361 struct nft_chain *chain = ctx->chain; 2362 struct nft_base_chain *basechain; 2363 struct nft_stats *stats = NULL; 2364 struct nft_chain_hook hook; 2365 struct nf_hook_ops *ops; 2366 struct nft_trans *trans; 2367 int err; 2368 2369 if (chain->flags ^ flags) 2370 return -EOPNOTSUPP; 2371 2372 if (nla[NFTA_CHAIN_HOOK]) { 2373 if (!nft_is_base_chain(chain)) { 2374 NL_SET_BAD_ATTR(extack, attr); 2375 return -EEXIST; 2376 } 2377 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family, 2378 extack, false); 2379 if (err < 0) 2380 return err; 2381 2382 basechain = nft_base_chain(chain); 2383 if (basechain->type != hook.type) { 2384 nft_chain_release_hook(&hook); 2385 NL_SET_BAD_ATTR(extack, attr); 2386 return -EEXIST; 2387 } 2388 2389 if (nft_base_chain_netdev(ctx->family, hook.num)) { 2390 if (!nft_hook_list_equal(&basechain->hook_list, 2391 &hook.list)) { 2392 nft_chain_release_hook(&hook); 2393 NL_SET_BAD_ATTR(extack, attr); 2394 return -EEXIST; 2395 } 2396 } else { 2397 ops = &basechain->ops; 2398 if (ops->hooknum != hook.num || 2399 ops->priority != hook.priority) { 2400 nft_chain_release_hook(&hook); 2401 NL_SET_BAD_ATTR(extack, attr); 2402 return -EEXIST; 2403 } 2404 } 2405 nft_chain_release_hook(&hook); 2406 } 2407 2408 if (nla[NFTA_CHAIN_HANDLE] && 2409 nla[NFTA_CHAIN_NAME]) { 2410 struct nft_chain *chain2; 2411 2412 chain2 = nft_chain_lookup(ctx->net, table, 2413 nla[NFTA_CHAIN_NAME], genmask); 2414 if (!IS_ERR(chain2)) { 2415 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 2416 return -EEXIST; 2417 } 2418 } 2419 2420 if (nla[NFTA_CHAIN_COUNTERS]) { 2421 if (!nft_is_base_chain(chain)) 2422 return -EOPNOTSUPP; 2423 2424 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]); 2425 if (IS_ERR(stats)) 2426 return PTR_ERR(stats); 2427 } 2428 2429 err = -ENOMEM; 2430 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN, 2431 sizeof(struct nft_trans_chain)); 2432 if (trans == NULL) 2433 goto err; 2434 2435 nft_trans_chain_stats(trans) = stats; 2436 nft_trans_chain_update(trans) = true; 2437 2438 if (nla[NFTA_CHAIN_POLICY]) 2439 nft_trans_chain_policy(trans) = policy; 2440 else 2441 nft_trans_chain_policy(trans) = -1; 2442 2443 if (nla[NFTA_CHAIN_HANDLE] && 2444 nla[NFTA_CHAIN_NAME]) { 2445 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 2446 struct nft_trans *tmp; 2447 char *name; 2448 2449 err = -ENOMEM; 2450 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT); 2451 if (!name) 2452 goto err; 2453 2454 err = -EEXIST; 2455 list_for_each_entry(tmp, &nft_net->commit_list, list) { 2456 if (tmp->msg_type == NFT_MSG_NEWCHAIN && 2457 tmp->ctx.table == table && 2458 nft_trans_chain_update(tmp) && 2459 nft_trans_chain_name(tmp) && 2460 strcmp(name, nft_trans_chain_name(tmp)) == 0) { 2461 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]); 2462 kfree(name); 2463 goto err; 2464 } 2465 } 2466 2467 nft_trans_chain_name(trans) = name; 2468 } 2469 nft_trans_commit_list_add_tail(ctx->net, trans); 2470 2471 return 0; 2472 err: 2473 free_percpu(stats); 2474 kfree(trans); 2475 return err; 2476 } 2477 2478 static struct nft_chain *nft_chain_lookup_byid(const struct net *net, 2479 const struct nft_table *table, 2480 const struct nlattr *nla) 2481 { 2482 struct nftables_pernet *nft_net = nft_pernet(net); 2483 u32 id = ntohl(nla_get_be32(nla)); 2484 struct nft_trans *trans; 2485 2486 list_for_each_entry(trans, &nft_net->commit_list, list) { 2487 struct nft_chain *chain = trans->ctx.chain; 2488 2489 if (trans->msg_type == NFT_MSG_NEWCHAIN && 2490 chain->table == table && 2491 id == nft_trans_chain_id(trans)) 2492 return chain; 2493 } 2494 return ERR_PTR(-ENOENT); 2495 } 2496 2497 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info, 2498 const struct nlattr * const nla[]) 2499 { 2500 struct nftables_pernet *nft_net = nft_pernet(info->net); 2501 struct netlink_ext_ack *extack = info->extack; 2502 u8 genmask = nft_genmask_next(info->net); 2503 u8 family = info->nfmsg->nfgen_family; 2504 struct nft_chain *chain = NULL; 2505 struct net *net = info->net; 2506 const struct nlattr *attr; 2507 struct nft_table *table; 2508 u8 policy = NF_ACCEPT; 2509 struct nft_ctx ctx; 2510 u64 handle = 0; 2511 u32 flags = 0; 2512 2513 lockdep_assert_held(&nft_net->commit_mutex); 2514 2515 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 2516 NETLINK_CB(skb).portid); 2517 if (IS_ERR(table)) { 2518 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 2519 return PTR_ERR(table); 2520 } 2521 2522 chain = NULL; 2523 attr = nla[NFTA_CHAIN_NAME]; 2524 2525 if (nla[NFTA_CHAIN_HANDLE]) { 2526 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE])); 2527 chain = nft_chain_lookup_byhandle(table, handle, genmask); 2528 if (IS_ERR(chain)) { 2529 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]); 2530 return PTR_ERR(chain); 2531 } 2532 attr = nla[NFTA_CHAIN_HANDLE]; 2533 } else if (nla[NFTA_CHAIN_NAME]) { 2534 chain = nft_chain_lookup(net, table, attr, genmask); 2535 if (IS_ERR(chain)) { 2536 if (PTR_ERR(chain) != -ENOENT) { 2537 NL_SET_BAD_ATTR(extack, attr); 2538 return PTR_ERR(chain); 2539 } 2540 chain = NULL; 2541 } 2542 } else if (!nla[NFTA_CHAIN_ID]) { 2543 return -EINVAL; 2544 } 2545 2546 if (nla[NFTA_CHAIN_POLICY]) { 2547 if (chain != NULL && 2548 !nft_is_base_chain(chain)) { 2549 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); 2550 return -EOPNOTSUPP; 2551 } 2552 2553 if (chain == NULL && 2554 nla[NFTA_CHAIN_HOOK] == NULL) { 2555 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]); 2556 return -EOPNOTSUPP; 2557 } 2558 2559 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY])); 2560 switch (policy) { 2561 case NF_DROP: 2562 case NF_ACCEPT: 2563 break; 2564 default: 2565 return -EINVAL; 2566 } 2567 } 2568 2569 if (nla[NFTA_CHAIN_FLAGS]) 2570 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS])); 2571 else if (chain) 2572 flags = chain->flags; 2573 2574 if (flags & ~NFT_CHAIN_FLAGS) 2575 return -EOPNOTSUPP; 2576 2577 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 2578 2579 if (chain != NULL) { 2580 if (chain->flags & NFT_CHAIN_BINDING) 2581 return -EINVAL; 2582 2583 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 2584 NL_SET_BAD_ATTR(extack, attr); 2585 return -EEXIST; 2586 } 2587 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 2588 return -EOPNOTSUPP; 2589 2590 flags |= chain->flags & NFT_CHAIN_BASE; 2591 return nf_tables_updchain(&ctx, genmask, policy, flags, attr, 2592 extack); 2593 } 2594 2595 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack); 2596 } 2597 2598 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info, 2599 const struct nlattr * const nla[]) 2600 { 2601 struct netlink_ext_ack *extack = info->extack; 2602 u8 genmask = nft_genmask_next(info->net); 2603 u8 family = info->nfmsg->nfgen_family; 2604 struct net *net = info->net; 2605 const struct nlattr *attr; 2606 struct nft_table *table; 2607 struct nft_chain *chain; 2608 struct nft_rule *rule; 2609 struct nft_ctx ctx; 2610 u64 handle; 2611 u32 use; 2612 int err; 2613 2614 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 2615 NETLINK_CB(skb).portid); 2616 if (IS_ERR(table)) { 2617 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]); 2618 return PTR_ERR(table); 2619 } 2620 2621 if (nla[NFTA_CHAIN_HANDLE]) { 2622 attr = nla[NFTA_CHAIN_HANDLE]; 2623 handle = be64_to_cpu(nla_get_be64(attr)); 2624 chain = nft_chain_lookup_byhandle(table, handle, genmask); 2625 } else { 2626 attr = nla[NFTA_CHAIN_NAME]; 2627 chain = nft_chain_lookup(net, table, attr, genmask); 2628 } 2629 if (IS_ERR(chain)) { 2630 NL_SET_BAD_ATTR(extack, attr); 2631 return PTR_ERR(chain); 2632 } 2633 2634 if (info->nlh->nlmsg_flags & NLM_F_NONREC && 2635 chain->use > 0) 2636 return -EBUSY; 2637 2638 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 2639 2640 use = chain->use; 2641 list_for_each_entry(rule, &chain->rules, list) { 2642 if (!nft_is_active_next(net, rule)) 2643 continue; 2644 use--; 2645 2646 err = nft_delrule(&ctx, rule); 2647 if (err < 0) 2648 return err; 2649 } 2650 2651 /* There are rules and elements that are still holding references to us, 2652 * we cannot do a recursive removal in this case. 2653 */ 2654 if (use > 0) { 2655 NL_SET_BAD_ATTR(extack, attr); 2656 return -EBUSY; 2657 } 2658 2659 return nft_delchain(&ctx); 2660 } 2661 2662 /* 2663 * Expressions 2664 */ 2665 2666 /** 2667 * nft_register_expr - register nf_tables expr type 2668 * @type: expr type 2669 * 2670 * Registers the expr type for use with nf_tables. Returns zero on 2671 * success or a negative errno code otherwise. 2672 */ 2673 int nft_register_expr(struct nft_expr_type *type) 2674 { 2675 nfnl_lock(NFNL_SUBSYS_NFTABLES); 2676 if (type->family == NFPROTO_UNSPEC) 2677 list_add_tail_rcu(&type->list, &nf_tables_expressions); 2678 else 2679 list_add_rcu(&type->list, &nf_tables_expressions); 2680 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 2681 return 0; 2682 } 2683 EXPORT_SYMBOL_GPL(nft_register_expr); 2684 2685 /** 2686 * nft_unregister_expr - unregister nf_tables expr type 2687 * @type: expr type 2688 * 2689 * Unregisters the expr typefor use with nf_tables. 2690 */ 2691 void nft_unregister_expr(struct nft_expr_type *type) 2692 { 2693 nfnl_lock(NFNL_SUBSYS_NFTABLES); 2694 list_del_rcu(&type->list); 2695 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 2696 } 2697 EXPORT_SYMBOL_GPL(nft_unregister_expr); 2698 2699 static const struct nft_expr_type *__nft_expr_type_get(u8 family, 2700 struct nlattr *nla) 2701 { 2702 const struct nft_expr_type *type, *candidate = NULL; 2703 2704 list_for_each_entry(type, &nf_tables_expressions, list) { 2705 if (!nla_strcmp(nla, type->name)) { 2706 if (!type->family && !candidate) 2707 candidate = type; 2708 else if (type->family == family) 2709 candidate = type; 2710 } 2711 } 2712 return candidate; 2713 } 2714 2715 #ifdef CONFIG_MODULES 2716 static int nft_expr_type_request_module(struct net *net, u8 family, 2717 struct nlattr *nla) 2718 { 2719 if (nft_request_module(net, "nft-expr-%u-%.*s", family, 2720 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN) 2721 return -EAGAIN; 2722 2723 return 0; 2724 } 2725 #endif 2726 2727 static const struct nft_expr_type *nft_expr_type_get(struct net *net, 2728 u8 family, 2729 struct nlattr *nla) 2730 { 2731 const struct nft_expr_type *type; 2732 2733 if (nla == NULL) 2734 return ERR_PTR(-EINVAL); 2735 2736 type = __nft_expr_type_get(family, nla); 2737 if (type != NULL && try_module_get(type->owner)) 2738 return type; 2739 2740 lockdep_nfnl_nft_mutex_not_held(); 2741 #ifdef CONFIG_MODULES 2742 if (type == NULL) { 2743 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN) 2744 return ERR_PTR(-EAGAIN); 2745 2746 if (nft_request_module(net, "nft-expr-%.*s", 2747 nla_len(nla), 2748 (char *)nla_data(nla)) == -EAGAIN) 2749 return ERR_PTR(-EAGAIN); 2750 } 2751 #endif 2752 return ERR_PTR(-ENOENT); 2753 } 2754 2755 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = { 2756 [NFTA_EXPR_NAME] = { .type = NLA_STRING, 2757 .len = NFT_MODULE_AUTOLOAD_LIMIT }, 2758 [NFTA_EXPR_DATA] = { .type = NLA_NESTED }, 2759 }; 2760 2761 static int nf_tables_fill_expr_info(struct sk_buff *skb, 2762 const struct nft_expr *expr) 2763 { 2764 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name)) 2765 goto nla_put_failure; 2766 2767 if (expr->ops->dump) { 2768 struct nlattr *data = nla_nest_start_noflag(skb, 2769 NFTA_EXPR_DATA); 2770 if (data == NULL) 2771 goto nla_put_failure; 2772 if (expr->ops->dump(skb, expr) < 0) 2773 goto nla_put_failure; 2774 nla_nest_end(skb, data); 2775 } 2776 2777 return skb->len; 2778 2779 nla_put_failure: 2780 return -1; 2781 }; 2782 2783 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 2784 const struct nft_expr *expr) 2785 { 2786 struct nlattr *nest; 2787 2788 nest = nla_nest_start_noflag(skb, attr); 2789 if (!nest) 2790 goto nla_put_failure; 2791 if (nf_tables_fill_expr_info(skb, expr) < 0) 2792 goto nla_put_failure; 2793 nla_nest_end(skb, nest); 2794 return 0; 2795 2796 nla_put_failure: 2797 return -1; 2798 } 2799 2800 struct nft_expr_info { 2801 const struct nft_expr_ops *ops; 2802 const struct nlattr *attr; 2803 struct nlattr *tb[NFT_EXPR_MAXATTR + 1]; 2804 }; 2805 2806 static int nf_tables_expr_parse(const struct nft_ctx *ctx, 2807 const struct nlattr *nla, 2808 struct nft_expr_info *info) 2809 { 2810 const struct nft_expr_type *type; 2811 const struct nft_expr_ops *ops; 2812 struct nlattr *tb[NFTA_EXPR_MAX + 1]; 2813 int err; 2814 2815 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla, 2816 nft_expr_policy, NULL); 2817 if (err < 0) 2818 return err; 2819 2820 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]); 2821 if (IS_ERR(type)) 2822 return PTR_ERR(type); 2823 2824 if (tb[NFTA_EXPR_DATA]) { 2825 err = nla_parse_nested_deprecated(info->tb, type->maxattr, 2826 tb[NFTA_EXPR_DATA], 2827 type->policy, NULL); 2828 if (err < 0) 2829 goto err1; 2830 } else 2831 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1)); 2832 2833 if (type->select_ops != NULL) { 2834 ops = type->select_ops(ctx, 2835 (const struct nlattr * const *)info->tb); 2836 if (IS_ERR(ops)) { 2837 err = PTR_ERR(ops); 2838 #ifdef CONFIG_MODULES 2839 if (err == -EAGAIN) 2840 if (nft_expr_type_request_module(ctx->net, 2841 ctx->family, 2842 tb[NFTA_EXPR_NAME]) != -EAGAIN) 2843 err = -ENOENT; 2844 #endif 2845 goto err1; 2846 } 2847 } else 2848 ops = type->ops; 2849 2850 info->attr = nla; 2851 info->ops = ops; 2852 2853 return 0; 2854 2855 err1: 2856 module_put(type->owner); 2857 return err; 2858 } 2859 2860 static int nf_tables_newexpr(const struct nft_ctx *ctx, 2861 const struct nft_expr_info *expr_info, 2862 struct nft_expr *expr) 2863 { 2864 const struct nft_expr_ops *ops = expr_info->ops; 2865 int err; 2866 2867 expr->ops = ops; 2868 if (ops->init) { 2869 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb); 2870 if (err < 0) 2871 goto err1; 2872 } 2873 2874 return 0; 2875 err1: 2876 expr->ops = NULL; 2877 return err; 2878 } 2879 2880 static void nf_tables_expr_destroy(const struct nft_ctx *ctx, 2881 struct nft_expr *expr) 2882 { 2883 const struct nft_expr_type *type = expr->ops->type; 2884 2885 if (expr->ops->destroy) 2886 expr->ops->destroy(ctx, expr); 2887 module_put(type->owner); 2888 } 2889 2890 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, 2891 const struct nlattr *nla) 2892 { 2893 struct nft_expr_info expr_info; 2894 struct nft_expr *expr; 2895 struct module *owner; 2896 int err; 2897 2898 err = nf_tables_expr_parse(ctx, nla, &expr_info); 2899 if (err < 0) 2900 goto err_expr_parse; 2901 2902 err = -EOPNOTSUPP; 2903 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL)) 2904 goto err_expr_stateful; 2905 2906 err = -ENOMEM; 2907 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT); 2908 if (expr == NULL) 2909 goto err_expr_stateful; 2910 2911 err = nf_tables_newexpr(ctx, &expr_info, expr); 2912 if (err < 0) 2913 goto err_expr_new; 2914 2915 return expr; 2916 err_expr_new: 2917 kfree(expr); 2918 err_expr_stateful: 2919 owner = expr_info.ops->type->owner; 2920 if (expr_info.ops->type->release_ops) 2921 expr_info.ops->type->release_ops(expr_info.ops); 2922 2923 module_put(owner); 2924 err_expr_parse: 2925 return ERR_PTR(err); 2926 } 2927 2928 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src) 2929 { 2930 int err; 2931 2932 if (src->ops->clone) { 2933 dst->ops = src->ops; 2934 err = src->ops->clone(dst, src); 2935 if (err < 0) 2936 return err; 2937 } else { 2938 memcpy(dst, src, src->ops->size); 2939 } 2940 2941 __module_get(src->ops->type->owner); 2942 2943 return 0; 2944 } 2945 2946 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr) 2947 { 2948 nf_tables_expr_destroy(ctx, expr); 2949 kfree(expr); 2950 } 2951 2952 /* 2953 * Rules 2954 */ 2955 2956 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain, 2957 u64 handle) 2958 { 2959 struct nft_rule *rule; 2960 2961 // FIXME: this sucks 2962 list_for_each_entry_rcu(rule, &chain->rules, list) { 2963 if (handle == rule->handle) 2964 return rule; 2965 } 2966 2967 return ERR_PTR(-ENOENT); 2968 } 2969 2970 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain, 2971 const struct nlattr *nla) 2972 { 2973 if (nla == NULL) 2974 return ERR_PTR(-EINVAL); 2975 2976 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla))); 2977 } 2978 2979 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = { 2980 [NFTA_RULE_TABLE] = { .type = NLA_STRING, 2981 .len = NFT_TABLE_MAXNAMELEN - 1 }, 2982 [NFTA_RULE_CHAIN] = { .type = NLA_STRING, 2983 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 2984 [NFTA_RULE_HANDLE] = { .type = NLA_U64 }, 2985 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED }, 2986 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED }, 2987 [NFTA_RULE_POSITION] = { .type = NLA_U64 }, 2988 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY, 2989 .len = NFT_USERDATA_MAXLEN }, 2990 [NFTA_RULE_ID] = { .type = NLA_U32 }, 2991 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 }, 2992 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 }, 2993 }; 2994 2995 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net, 2996 u32 portid, u32 seq, int event, 2997 u32 flags, int family, 2998 const struct nft_table *table, 2999 const struct nft_chain *chain, 3000 const struct nft_rule *rule, u64 handle) 3001 { 3002 struct nlmsghdr *nlh; 3003 const struct nft_expr *expr, *next; 3004 struct nlattr *list; 3005 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 3006 3007 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0, 3008 nft_base_seq(net)); 3009 if (!nlh) 3010 goto nla_put_failure; 3011 3012 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name)) 3013 goto nla_put_failure; 3014 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name)) 3015 goto nla_put_failure; 3016 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle), 3017 NFTA_RULE_PAD)) 3018 goto nla_put_failure; 3019 3020 if (event != NFT_MSG_DELRULE && handle) { 3021 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle), 3022 NFTA_RULE_PAD)) 3023 goto nla_put_failure; 3024 } 3025 3026 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) 3027 nft_flow_rule_stats(chain, rule); 3028 3029 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS); 3030 if (list == NULL) 3031 goto nla_put_failure; 3032 nft_rule_for_each_expr(expr, next, rule) { 3033 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) 3034 goto nla_put_failure; 3035 } 3036 nla_nest_end(skb, list); 3037 3038 if (rule->udata) { 3039 struct nft_userdata *udata = nft_userdata(rule); 3040 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1, 3041 udata->data) < 0) 3042 goto nla_put_failure; 3043 } 3044 3045 nlmsg_end(skb, nlh); 3046 return 0; 3047 3048 nla_put_failure: 3049 nlmsg_trim(skb, nlh); 3050 return -1; 3051 } 3052 3053 static void nf_tables_rule_notify(const struct nft_ctx *ctx, 3054 const struct nft_rule *rule, int event) 3055 { 3056 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 3057 const struct nft_rule *prule; 3058 struct sk_buff *skb; 3059 u64 handle = 0; 3060 u16 flags = 0; 3061 int err; 3062 3063 if (!ctx->report && 3064 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 3065 return; 3066 3067 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 3068 if (skb == NULL) 3069 goto err; 3070 3071 if (event == NFT_MSG_NEWRULE && 3072 !list_is_first(&rule->list, &ctx->chain->rules) && 3073 !list_is_last(&rule->list, &ctx->chain->rules)) { 3074 prule = list_prev_entry(rule, list); 3075 handle = prule->handle; 3076 } 3077 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE)) 3078 flags |= NLM_F_APPEND; 3079 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 3080 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 3081 3082 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq, 3083 event, flags, ctx->family, ctx->table, 3084 ctx->chain, rule, handle); 3085 if (err < 0) { 3086 kfree_skb(skb); 3087 goto err; 3088 } 3089 3090 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 3091 return; 3092 err: 3093 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 3094 } 3095 3096 struct nft_rule_dump_ctx { 3097 char *table; 3098 char *chain; 3099 }; 3100 3101 static int __nf_tables_dump_rules(struct sk_buff *skb, 3102 unsigned int *idx, 3103 struct netlink_callback *cb, 3104 const struct nft_table *table, 3105 const struct nft_chain *chain) 3106 { 3107 struct net *net = sock_net(skb->sk); 3108 const struct nft_rule *rule, *prule; 3109 unsigned int s_idx = cb->args[0]; 3110 u64 handle; 3111 3112 prule = NULL; 3113 list_for_each_entry_rcu(rule, &chain->rules, list) { 3114 if (!nft_is_active(net, rule)) 3115 goto cont_skip; 3116 if (*idx < s_idx) 3117 goto cont; 3118 if (*idx > s_idx) { 3119 memset(&cb->args[1], 0, 3120 sizeof(cb->args) - sizeof(cb->args[0])); 3121 } 3122 if (prule) 3123 handle = prule->handle; 3124 else 3125 handle = 0; 3126 3127 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid, 3128 cb->nlh->nlmsg_seq, 3129 NFT_MSG_NEWRULE, 3130 NLM_F_MULTI | NLM_F_APPEND, 3131 table->family, 3132 table, chain, rule, handle) < 0) 3133 return 1; 3134 3135 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3136 cont: 3137 prule = rule; 3138 cont_skip: 3139 (*idx)++; 3140 } 3141 return 0; 3142 } 3143 3144 static int nf_tables_dump_rules(struct sk_buff *skb, 3145 struct netlink_callback *cb) 3146 { 3147 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 3148 const struct nft_rule_dump_ctx *ctx = cb->data; 3149 struct nft_table *table; 3150 const struct nft_chain *chain; 3151 unsigned int idx = 0; 3152 struct net *net = sock_net(skb->sk); 3153 int family = nfmsg->nfgen_family; 3154 struct nftables_pernet *nft_net; 3155 3156 rcu_read_lock(); 3157 nft_net = nft_pernet(net); 3158 cb->seq = READ_ONCE(nft_net->base_seq); 3159 3160 list_for_each_entry_rcu(table, &nft_net->tables, list) { 3161 if (family != NFPROTO_UNSPEC && family != table->family) 3162 continue; 3163 3164 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0) 3165 continue; 3166 3167 if (ctx && ctx->table && ctx->chain) { 3168 struct rhlist_head *list, *tmp; 3169 3170 list = rhltable_lookup(&table->chains_ht, ctx->chain, 3171 nft_chain_ht_params); 3172 if (!list) 3173 goto done; 3174 3175 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) { 3176 if (!nft_is_active(net, chain)) 3177 continue; 3178 __nf_tables_dump_rules(skb, &idx, 3179 cb, table, chain); 3180 break; 3181 } 3182 goto done; 3183 } 3184 3185 list_for_each_entry_rcu(chain, &table->chains, list) { 3186 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain)) 3187 goto done; 3188 } 3189 3190 if (ctx && ctx->table) 3191 break; 3192 } 3193 done: 3194 rcu_read_unlock(); 3195 3196 cb->args[0] = idx; 3197 return skb->len; 3198 } 3199 3200 static int nf_tables_dump_rules_start(struct netlink_callback *cb) 3201 { 3202 const struct nlattr * const *nla = cb->data; 3203 struct nft_rule_dump_ctx *ctx = NULL; 3204 3205 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) { 3206 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC); 3207 if (!ctx) 3208 return -ENOMEM; 3209 3210 if (nla[NFTA_RULE_TABLE]) { 3211 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], 3212 GFP_ATOMIC); 3213 if (!ctx->table) { 3214 kfree(ctx); 3215 return -ENOMEM; 3216 } 3217 } 3218 if (nla[NFTA_RULE_CHAIN]) { 3219 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], 3220 GFP_ATOMIC); 3221 if (!ctx->chain) { 3222 kfree(ctx->table); 3223 kfree(ctx); 3224 return -ENOMEM; 3225 } 3226 } 3227 } 3228 3229 cb->data = ctx; 3230 return 0; 3231 } 3232 3233 static int nf_tables_dump_rules_done(struct netlink_callback *cb) 3234 { 3235 struct nft_rule_dump_ctx *ctx = cb->data; 3236 3237 if (ctx) { 3238 kfree(ctx->table); 3239 kfree(ctx->chain); 3240 kfree(ctx); 3241 } 3242 return 0; 3243 } 3244 3245 /* called with rcu_read_lock held */ 3246 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info, 3247 const struct nlattr * const nla[]) 3248 { 3249 struct netlink_ext_ack *extack = info->extack; 3250 u8 genmask = nft_genmask_cur(info->net); 3251 u8 family = info->nfmsg->nfgen_family; 3252 const struct nft_chain *chain; 3253 const struct nft_rule *rule; 3254 struct net *net = info->net; 3255 struct nft_table *table; 3256 struct sk_buff *skb2; 3257 int err; 3258 3259 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 3260 struct netlink_dump_control c = { 3261 .start= nf_tables_dump_rules_start, 3262 .dump = nf_tables_dump_rules, 3263 .done = nf_tables_dump_rules_done, 3264 .module = THIS_MODULE, 3265 .data = (void *)nla, 3266 }; 3267 3268 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 3269 } 3270 3271 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0); 3272 if (IS_ERR(table)) { 3273 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3274 return PTR_ERR(table); 3275 } 3276 3277 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask); 3278 if (IS_ERR(chain)) { 3279 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3280 return PTR_ERR(chain); 3281 } 3282 3283 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); 3284 if (IS_ERR(rule)) { 3285 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3286 return PTR_ERR(rule); 3287 } 3288 3289 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 3290 if (!skb2) 3291 return -ENOMEM; 3292 3293 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid, 3294 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0, 3295 family, table, chain, rule, 0); 3296 if (err < 0) 3297 goto err_fill_rule_info; 3298 3299 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 3300 3301 err_fill_rule_info: 3302 kfree_skb(skb2); 3303 return err; 3304 } 3305 3306 static void nf_tables_rule_destroy(const struct nft_ctx *ctx, 3307 struct nft_rule *rule) 3308 { 3309 struct nft_expr *expr, *next; 3310 3311 /* 3312 * Careful: some expressions might not be initialized in case this 3313 * is called on error from nf_tables_newrule(). 3314 */ 3315 expr = nft_expr_first(rule); 3316 while (nft_expr_more(rule, expr)) { 3317 next = nft_expr_next(expr); 3318 nf_tables_expr_destroy(ctx, expr); 3319 expr = next; 3320 } 3321 kfree(rule); 3322 } 3323 3324 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule) 3325 { 3326 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE); 3327 nf_tables_rule_destroy(ctx, rule); 3328 } 3329 3330 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain) 3331 { 3332 struct nft_expr *expr, *last; 3333 const struct nft_data *data; 3334 struct nft_rule *rule; 3335 int err; 3336 3337 if (ctx->level == NFT_JUMP_STACK_SIZE) 3338 return -EMLINK; 3339 3340 list_for_each_entry(rule, &chain->rules, list) { 3341 if (!nft_is_active_next(ctx->net, rule)) 3342 continue; 3343 3344 nft_rule_for_each_expr(expr, last, rule) { 3345 if (!expr->ops->validate) 3346 continue; 3347 3348 err = expr->ops->validate(ctx, expr, &data); 3349 if (err < 0) 3350 return err; 3351 } 3352 3353 cond_resched(); 3354 } 3355 3356 return 0; 3357 } 3358 EXPORT_SYMBOL_GPL(nft_chain_validate); 3359 3360 static int nft_table_validate(struct net *net, const struct nft_table *table) 3361 { 3362 struct nft_chain *chain; 3363 struct nft_ctx ctx = { 3364 .net = net, 3365 .family = table->family, 3366 }; 3367 int err; 3368 3369 list_for_each_entry(chain, &table->chains, list) { 3370 if (!nft_is_base_chain(chain)) 3371 continue; 3372 3373 ctx.chain = chain; 3374 err = nft_chain_validate(&ctx, chain); 3375 if (err < 0) 3376 return err; 3377 } 3378 3379 return 0; 3380 } 3381 3382 static struct nft_rule *nft_rule_lookup_byid(const struct net *net, 3383 const struct nft_chain *chain, 3384 const struct nlattr *nla); 3385 3386 #define NFT_RULE_MAXEXPRS 128 3387 3388 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info, 3389 const struct nlattr * const nla[]) 3390 { 3391 struct nftables_pernet *nft_net = nft_pernet(info->net); 3392 struct netlink_ext_ack *extack = info->extack; 3393 unsigned int size, i, n, ulen = 0, usize = 0; 3394 u8 genmask = nft_genmask_next(info->net); 3395 struct nft_rule *rule, *old_rule = NULL; 3396 struct nft_expr_info *expr_info = NULL; 3397 u8 family = info->nfmsg->nfgen_family; 3398 struct nft_flow_rule *flow = NULL; 3399 struct net *net = info->net; 3400 struct nft_userdata *udata; 3401 struct nft_table *table; 3402 struct nft_chain *chain; 3403 struct nft_trans *trans; 3404 u64 handle, pos_handle; 3405 struct nft_expr *expr; 3406 struct nft_ctx ctx; 3407 struct nlattr *tmp; 3408 int err, rem; 3409 3410 lockdep_assert_held(&nft_net->commit_mutex); 3411 3412 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 3413 NETLINK_CB(skb).portid); 3414 if (IS_ERR(table)) { 3415 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3416 return PTR_ERR(table); 3417 } 3418 3419 if (nla[NFTA_RULE_CHAIN]) { 3420 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], 3421 genmask); 3422 if (IS_ERR(chain)) { 3423 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3424 return PTR_ERR(chain); 3425 } 3426 if (nft_chain_is_bound(chain)) 3427 return -EOPNOTSUPP; 3428 3429 } else if (nla[NFTA_RULE_CHAIN_ID]) { 3430 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]); 3431 if (IS_ERR(chain)) { 3432 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]); 3433 return PTR_ERR(chain); 3434 } 3435 } else { 3436 return -EINVAL; 3437 } 3438 3439 if (nla[NFTA_RULE_HANDLE]) { 3440 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE])); 3441 rule = __nft_rule_lookup(chain, handle); 3442 if (IS_ERR(rule)) { 3443 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3444 return PTR_ERR(rule); 3445 } 3446 3447 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 3448 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3449 return -EEXIST; 3450 } 3451 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 3452 old_rule = rule; 3453 else 3454 return -EOPNOTSUPP; 3455 } else { 3456 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) || 3457 info->nlh->nlmsg_flags & NLM_F_REPLACE) 3458 return -EINVAL; 3459 handle = nf_tables_alloc_handle(table); 3460 3461 if (chain->use == UINT_MAX) 3462 return -EOVERFLOW; 3463 3464 if (nla[NFTA_RULE_POSITION]) { 3465 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION])); 3466 old_rule = __nft_rule_lookup(chain, pos_handle); 3467 if (IS_ERR(old_rule)) { 3468 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]); 3469 return PTR_ERR(old_rule); 3470 } 3471 } else if (nla[NFTA_RULE_POSITION_ID]) { 3472 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]); 3473 if (IS_ERR(old_rule)) { 3474 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]); 3475 return PTR_ERR(old_rule); 3476 } 3477 } 3478 } 3479 3480 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 3481 3482 n = 0; 3483 size = 0; 3484 if (nla[NFTA_RULE_EXPRESSIONS]) { 3485 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS, 3486 sizeof(struct nft_expr_info), 3487 GFP_KERNEL); 3488 if (!expr_info) 3489 return -ENOMEM; 3490 3491 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) { 3492 err = -EINVAL; 3493 if (nla_type(tmp) != NFTA_LIST_ELEM) 3494 goto err_release_expr; 3495 if (n == NFT_RULE_MAXEXPRS) 3496 goto err_release_expr; 3497 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]); 3498 if (err < 0) { 3499 NL_SET_BAD_ATTR(extack, tmp); 3500 goto err_release_expr; 3501 } 3502 size += expr_info[n].ops->size; 3503 n++; 3504 } 3505 } 3506 /* Check for overflow of dlen field */ 3507 err = -EFBIG; 3508 if (size >= 1 << 12) 3509 goto err_release_expr; 3510 3511 if (nla[NFTA_RULE_USERDATA]) { 3512 ulen = nla_len(nla[NFTA_RULE_USERDATA]); 3513 if (ulen > 0) 3514 usize = sizeof(struct nft_userdata) + ulen; 3515 } 3516 3517 err = -ENOMEM; 3518 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT); 3519 if (rule == NULL) 3520 goto err_release_expr; 3521 3522 nft_activate_next(net, rule); 3523 3524 rule->handle = handle; 3525 rule->dlen = size; 3526 rule->udata = ulen ? 1 : 0; 3527 3528 if (ulen) { 3529 udata = nft_userdata(rule); 3530 udata->len = ulen - 1; 3531 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen); 3532 } 3533 3534 expr = nft_expr_first(rule); 3535 for (i = 0; i < n; i++) { 3536 err = nf_tables_newexpr(&ctx, &expr_info[i], expr); 3537 if (err < 0) { 3538 NL_SET_BAD_ATTR(extack, expr_info[i].attr); 3539 goto err_release_rule; 3540 } 3541 3542 if (expr_info[i].ops->validate) 3543 nft_validate_state_update(net, NFT_VALIDATE_NEED); 3544 3545 expr_info[i].ops = NULL; 3546 expr = nft_expr_next(expr); 3547 } 3548 3549 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) { 3550 flow = nft_flow_rule_create(net, rule); 3551 if (IS_ERR(flow)) { 3552 err = PTR_ERR(flow); 3553 goto err_release_rule; 3554 } 3555 } 3556 3557 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) { 3558 err = nft_delrule(&ctx, old_rule); 3559 if (err < 0) 3560 goto err_destroy_flow_rule; 3561 3562 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); 3563 if (trans == NULL) { 3564 err = -ENOMEM; 3565 goto err_destroy_flow_rule; 3566 } 3567 list_add_tail_rcu(&rule->list, &old_rule->list); 3568 } else { 3569 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule); 3570 if (!trans) { 3571 err = -ENOMEM; 3572 goto err_destroy_flow_rule; 3573 } 3574 3575 if (info->nlh->nlmsg_flags & NLM_F_APPEND) { 3576 if (old_rule) 3577 list_add_rcu(&rule->list, &old_rule->list); 3578 else 3579 list_add_tail_rcu(&rule->list, &chain->rules); 3580 } else { 3581 if (old_rule) 3582 list_add_tail_rcu(&rule->list, &old_rule->list); 3583 else 3584 list_add_rcu(&rule->list, &chain->rules); 3585 } 3586 } 3587 kvfree(expr_info); 3588 chain->use++; 3589 3590 if (flow) 3591 nft_trans_flow_rule(trans) = flow; 3592 3593 if (nft_net->validate_state == NFT_VALIDATE_DO) 3594 return nft_table_validate(net, table); 3595 3596 return 0; 3597 3598 err_destroy_flow_rule: 3599 if (flow) 3600 nft_flow_rule_destroy(flow); 3601 err_release_rule: 3602 nf_tables_rule_release(&ctx, rule); 3603 err_release_expr: 3604 for (i = 0; i < n; i++) { 3605 if (expr_info[i].ops) { 3606 module_put(expr_info[i].ops->type->owner); 3607 if (expr_info[i].ops->type->release_ops) 3608 expr_info[i].ops->type->release_ops(expr_info[i].ops); 3609 } 3610 } 3611 kvfree(expr_info); 3612 3613 return err; 3614 } 3615 3616 static struct nft_rule *nft_rule_lookup_byid(const struct net *net, 3617 const struct nft_chain *chain, 3618 const struct nlattr *nla) 3619 { 3620 struct nftables_pernet *nft_net = nft_pernet(net); 3621 u32 id = ntohl(nla_get_be32(nla)); 3622 struct nft_trans *trans; 3623 3624 list_for_each_entry(trans, &nft_net->commit_list, list) { 3625 struct nft_rule *rule = nft_trans_rule(trans); 3626 3627 if (trans->msg_type == NFT_MSG_NEWRULE && 3628 trans->ctx.chain == chain && 3629 id == nft_trans_rule_id(trans)) 3630 return rule; 3631 } 3632 return ERR_PTR(-ENOENT); 3633 } 3634 3635 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info, 3636 const struct nlattr * const nla[]) 3637 { 3638 struct netlink_ext_ack *extack = info->extack; 3639 u8 genmask = nft_genmask_next(info->net); 3640 u8 family = info->nfmsg->nfgen_family; 3641 struct nft_chain *chain = NULL; 3642 struct net *net = info->net; 3643 struct nft_table *table; 3644 struct nft_rule *rule; 3645 struct nft_ctx ctx; 3646 int err = 0; 3647 3648 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 3649 NETLINK_CB(skb).portid); 3650 if (IS_ERR(table)) { 3651 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]); 3652 return PTR_ERR(table); 3653 } 3654 3655 if (nla[NFTA_RULE_CHAIN]) { 3656 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], 3657 genmask); 3658 if (IS_ERR(chain)) { 3659 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]); 3660 return PTR_ERR(chain); 3661 } 3662 if (nft_chain_is_bound(chain)) 3663 return -EOPNOTSUPP; 3664 } 3665 3666 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla); 3667 3668 if (chain) { 3669 if (nla[NFTA_RULE_HANDLE]) { 3670 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]); 3671 if (IS_ERR(rule)) { 3672 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]); 3673 return PTR_ERR(rule); 3674 } 3675 3676 err = nft_delrule(&ctx, rule); 3677 } else if (nla[NFTA_RULE_ID]) { 3678 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]); 3679 if (IS_ERR(rule)) { 3680 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]); 3681 return PTR_ERR(rule); 3682 } 3683 3684 err = nft_delrule(&ctx, rule); 3685 } else { 3686 err = nft_delrule_by_chain(&ctx); 3687 } 3688 } else { 3689 list_for_each_entry(chain, &table->chains, list) { 3690 if (!nft_is_active_next(net, chain)) 3691 continue; 3692 3693 ctx.chain = chain; 3694 err = nft_delrule_by_chain(&ctx); 3695 if (err < 0) 3696 break; 3697 } 3698 } 3699 3700 return err; 3701 } 3702 3703 /* 3704 * Sets 3705 */ 3706 static const struct nft_set_type *nft_set_types[] = { 3707 &nft_set_hash_fast_type, 3708 &nft_set_hash_type, 3709 &nft_set_rhash_type, 3710 &nft_set_bitmap_type, 3711 &nft_set_rbtree_type, 3712 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML) 3713 &nft_set_pipapo_avx2_type, 3714 #endif 3715 &nft_set_pipapo_type, 3716 }; 3717 3718 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \ 3719 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \ 3720 NFT_SET_EVAL) 3721 3722 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags) 3723 { 3724 return (flags & type->features) == (flags & NFT_SET_FEATURES); 3725 } 3726 3727 /* 3728 * Select a set implementation based on the data characteristics and the 3729 * given policy. The total memory use might not be known if no size is 3730 * given, in that case the amount of memory per element is used. 3731 */ 3732 static const struct nft_set_ops * 3733 nft_select_set_ops(const struct nft_ctx *ctx, 3734 const struct nlattr * const nla[], 3735 const struct nft_set_desc *desc, 3736 enum nft_set_policies policy) 3737 { 3738 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 3739 const struct nft_set_ops *ops, *bops; 3740 struct nft_set_estimate est, best; 3741 const struct nft_set_type *type; 3742 u32 flags = 0; 3743 int i; 3744 3745 lockdep_assert_held(&nft_net->commit_mutex); 3746 lockdep_nfnl_nft_mutex_not_held(); 3747 3748 if (nla[NFTA_SET_FLAGS] != NULL) 3749 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); 3750 3751 bops = NULL; 3752 best.size = ~0; 3753 best.lookup = ~0; 3754 best.space = ~0; 3755 3756 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) { 3757 type = nft_set_types[i]; 3758 ops = &type->ops; 3759 3760 if (!nft_set_ops_candidate(type, flags)) 3761 continue; 3762 if (!ops->estimate(desc, flags, &est)) 3763 continue; 3764 3765 switch (policy) { 3766 case NFT_SET_POL_PERFORMANCE: 3767 if (est.lookup < best.lookup) 3768 break; 3769 if (est.lookup == best.lookup && 3770 est.space < best.space) 3771 break; 3772 continue; 3773 case NFT_SET_POL_MEMORY: 3774 if (!desc->size) { 3775 if (est.space < best.space) 3776 break; 3777 if (est.space == best.space && 3778 est.lookup < best.lookup) 3779 break; 3780 } else if (est.size < best.size || !bops) { 3781 break; 3782 } 3783 continue; 3784 default: 3785 break; 3786 } 3787 3788 bops = ops; 3789 best = est; 3790 } 3791 3792 if (bops != NULL) 3793 return bops; 3794 3795 return ERR_PTR(-EOPNOTSUPP); 3796 } 3797 3798 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = { 3799 [NFTA_SET_TABLE] = { .type = NLA_STRING, 3800 .len = NFT_TABLE_MAXNAMELEN - 1 }, 3801 [NFTA_SET_NAME] = { .type = NLA_STRING, 3802 .len = NFT_SET_MAXNAMELEN - 1 }, 3803 [NFTA_SET_FLAGS] = { .type = NLA_U32 }, 3804 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 }, 3805 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 }, 3806 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 }, 3807 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 }, 3808 [NFTA_SET_POLICY] = { .type = NLA_U32 }, 3809 [NFTA_SET_DESC] = { .type = NLA_NESTED }, 3810 [NFTA_SET_ID] = { .type = NLA_U32 }, 3811 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 }, 3812 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 }, 3813 [NFTA_SET_USERDATA] = { .type = NLA_BINARY, 3814 .len = NFT_USERDATA_MAXLEN }, 3815 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 }, 3816 [NFTA_SET_HANDLE] = { .type = NLA_U64 }, 3817 [NFTA_SET_EXPR] = { .type = NLA_NESTED }, 3818 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED }, 3819 }; 3820 3821 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = { 3822 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 }, 3823 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED }, 3824 }; 3825 3826 static struct nft_set *nft_set_lookup(const struct nft_table *table, 3827 const struct nlattr *nla, u8 genmask) 3828 { 3829 struct nft_set *set; 3830 3831 if (nla == NULL) 3832 return ERR_PTR(-EINVAL); 3833 3834 list_for_each_entry_rcu(set, &table->sets, list) { 3835 if (!nla_strcmp(nla, set->name) && 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_byhandle(const struct nft_table *table, 3843 const struct nlattr *nla, 3844 u8 genmask) 3845 { 3846 struct nft_set *set; 3847 3848 list_for_each_entry(set, &table->sets, list) { 3849 if (be64_to_cpu(nla_get_be64(nla)) == set->handle && 3850 nft_active_genmask(set, genmask)) 3851 return set; 3852 } 3853 return ERR_PTR(-ENOENT); 3854 } 3855 3856 static struct nft_set *nft_set_lookup_byid(const struct net *net, 3857 const struct nft_table *table, 3858 const struct nlattr *nla, u8 genmask) 3859 { 3860 struct nftables_pernet *nft_net = nft_pernet(net); 3861 u32 id = ntohl(nla_get_be32(nla)); 3862 struct nft_trans *trans; 3863 3864 list_for_each_entry(trans, &nft_net->commit_list, list) { 3865 if (trans->msg_type == NFT_MSG_NEWSET) { 3866 struct nft_set *set = nft_trans_set(trans); 3867 3868 if (id == nft_trans_set_id(trans) && 3869 set->table == table && 3870 nft_active_genmask(set, genmask)) 3871 return set; 3872 } 3873 } 3874 return ERR_PTR(-ENOENT); 3875 } 3876 3877 struct nft_set *nft_set_lookup_global(const struct net *net, 3878 const struct nft_table *table, 3879 const struct nlattr *nla_set_name, 3880 const struct nlattr *nla_set_id, 3881 u8 genmask) 3882 { 3883 struct nft_set *set; 3884 3885 set = nft_set_lookup(table, nla_set_name, genmask); 3886 if (IS_ERR(set)) { 3887 if (!nla_set_id) 3888 return set; 3889 3890 set = nft_set_lookup_byid(net, table, nla_set_id, genmask); 3891 } 3892 return set; 3893 } 3894 EXPORT_SYMBOL_GPL(nft_set_lookup_global); 3895 3896 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set, 3897 const char *name) 3898 { 3899 const struct nft_set *i; 3900 const char *p; 3901 unsigned long *inuse; 3902 unsigned int n = 0, min = 0; 3903 3904 p = strchr(name, '%'); 3905 if (p != NULL) { 3906 if (p[1] != 'd' || strchr(p + 2, '%')) 3907 return -EINVAL; 3908 3909 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL); 3910 if (inuse == NULL) 3911 return -ENOMEM; 3912 cont: 3913 list_for_each_entry(i, &ctx->table->sets, list) { 3914 int tmp; 3915 3916 if (!nft_is_active_next(ctx->net, i)) 3917 continue; 3918 if (!sscanf(i->name, name, &tmp)) 3919 continue; 3920 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE) 3921 continue; 3922 3923 set_bit(tmp - min, inuse); 3924 } 3925 3926 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE); 3927 if (n >= BITS_PER_BYTE * PAGE_SIZE) { 3928 min += BITS_PER_BYTE * PAGE_SIZE; 3929 memset(inuse, 0, PAGE_SIZE); 3930 goto cont; 3931 } 3932 free_page((unsigned long)inuse); 3933 } 3934 3935 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n); 3936 if (!set->name) 3937 return -ENOMEM; 3938 3939 list_for_each_entry(i, &ctx->table->sets, list) { 3940 if (!nft_is_active_next(ctx->net, i)) 3941 continue; 3942 if (!strcmp(set->name, i->name)) { 3943 kfree(set->name); 3944 set->name = NULL; 3945 return -ENFILE; 3946 } 3947 } 3948 return 0; 3949 } 3950 3951 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result) 3952 { 3953 u64 ms = be64_to_cpu(nla_get_be64(nla)); 3954 u64 max = (u64)(~((u64)0)); 3955 3956 max = div_u64(max, NSEC_PER_MSEC); 3957 if (ms >= max) 3958 return -ERANGE; 3959 3960 ms *= NSEC_PER_MSEC; 3961 *result = nsecs_to_jiffies64(ms); 3962 return 0; 3963 } 3964 3965 __be64 nf_jiffies64_to_msecs(u64 input) 3966 { 3967 return cpu_to_be64(jiffies64_to_msecs(input)); 3968 } 3969 3970 static int nf_tables_fill_set_concat(struct sk_buff *skb, 3971 const struct nft_set *set) 3972 { 3973 struct nlattr *concat, *field; 3974 int i; 3975 3976 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT); 3977 if (!concat) 3978 return -ENOMEM; 3979 3980 for (i = 0; i < set->field_count; i++) { 3981 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); 3982 if (!field) 3983 return -ENOMEM; 3984 3985 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN, 3986 htonl(set->field_len[i]))) 3987 return -ENOMEM; 3988 3989 nla_nest_end(skb, field); 3990 } 3991 3992 nla_nest_end(skb, concat); 3993 3994 return 0; 3995 } 3996 3997 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx, 3998 const struct nft_set *set, u16 event, u16 flags) 3999 { 4000 struct nlmsghdr *nlh; 4001 u32 portid = ctx->portid; 4002 struct nlattr *nest; 4003 u32 seq = ctx->seq; 4004 int i; 4005 4006 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 4007 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family, 4008 NFNETLINK_V0, nft_base_seq(ctx->net)); 4009 if (!nlh) 4010 goto nla_put_failure; 4011 4012 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) 4013 goto nla_put_failure; 4014 if (nla_put_string(skb, NFTA_SET_NAME, set->name)) 4015 goto nla_put_failure; 4016 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle), 4017 NFTA_SET_PAD)) 4018 goto nla_put_failure; 4019 if (set->flags != 0) 4020 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags))) 4021 goto nla_put_failure; 4022 4023 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype))) 4024 goto nla_put_failure; 4025 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen))) 4026 goto nla_put_failure; 4027 if (set->flags & NFT_SET_MAP) { 4028 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype))) 4029 goto nla_put_failure; 4030 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen))) 4031 goto nla_put_failure; 4032 } 4033 if (set->flags & NFT_SET_OBJECT && 4034 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype))) 4035 goto nla_put_failure; 4036 4037 if (set->timeout && 4038 nla_put_be64(skb, NFTA_SET_TIMEOUT, 4039 nf_jiffies64_to_msecs(set->timeout), 4040 NFTA_SET_PAD)) 4041 goto nla_put_failure; 4042 if (set->gc_int && 4043 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int))) 4044 goto nla_put_failure; 4045 4046 if (set->policy != NFT_SET_POL_PERFORMANCE) { 4047 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy))) 4048 goto nla_put_failure; 4049 } 4050 4051 if (set->udata && 4052 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata)) 4053 goto nla_put_failure; 4054 4055 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC); 4056 if (!nest) 4057 goto nla_put_failure; 4058 if (set->size && 4059 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size))) 4060 goto nla_put_failure; 4061 4062 if (set->field_count > 1 && 4063 nf_tables_fill_set_concat(skb, set)) 4064 goto nla_put_failure; 4065 4066 nla_nest_end(skb, nest); 4067 4068 if (set->num_exprs == 1) { 4069 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR); 4070 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0) 4071 goto nla_put_failure; 4072 4073 nla_nest_end(skb, nest); 4074 } else if (set->num_exprs > 1) { 4075 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS); 4076 if (nest == NULL) 4077 goto nla_put_failure; 4078 4079 for (i = 0; i < set->num_exprs; i++) { 4080 if (nft_expr_dump(skb, NFTA_LIST_ELEM, 4081 set->exprs[i]) < 0) 4082 goto nla_put_failure; 4083 } 4084 nla_nest_end(skb, nest); 4085 } 4086 4087 nlmsg_end(skb, nlh); 4088 return 0; 4089 4090 nla_put_failure: 4091 nlmsg_trim(skb, nlh); 4092 return -1; 4093 } 4094 4095 static void nf_tables_set_notify(const struct nft_ctx *ctx, 4096 const struct nft_set *set, int event, 4097 gfp_t gfp_flags) 4098 { 4099 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 4100 u32 portid = ctx->portid; 4101 struct sk_buff *skb; 4102 u16 flags = 0; 4103 int err; 4104 4105 if (!ctx->report && 4106 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 4107 return; 4108 4109 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags); 4110 if (skb == NULL) 4111 goto err; 4112 4113 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 4114 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 4115 4116 err = nf_tables_fill_set(skb, ctx, set, event, flags); 4117 if (err < 0) { 4118 kfree_skb(skb); 4119 goto err; 4120 } 4121 4122 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 4123 return; 4124 err: 4125 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 4126 } 4127 4128 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb) 4129 { 4130 const struct nft_set *set; 4131 unsigned int idx, s_idx = cb->args[0]; 4132 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2]; 4133 struct net *net = sock_net(skb->sk); 4134 struct nft_ctx *ctx = cb->data, ctx_set; 4135 struct nftables_pernet *nft_net; 4136 4137 if (cb->args[1]) 4138 return skb->len; 4139 4140 rcu_read_lock(); 4141 nft_net = nft_pernet(net); 4142 cb->seq = READ_ONCE(nft_net->base_seq); 4143 4144 list_for_each_entry_rcu(table, &nft_net->tables, list) { 4145 if (ctx->family != NFPROTO_UNSPEC && 4146 ctx->family != table->family) 4147 continue; 4148 4149 if (ctx->table && ctx->table != table) 4150 continue; 4151 4152 if (cur_table) { 4153 if (cur_table != table) 4154 continue; 4155 4156 cur_table = NULL; 4157 } 4158 idx = 0; 4159 list_for_each_entry_rcu(set, &table->sets, list) { 4160 if (idx < s_idx) 4161 goto cont; 4162 if (!nft_is_active(net, set)) 4163 goto cont; 4164 4165 ctx_set = *ctx; 4166 ctx_set.table = table; 4167 ctx_set.family = table->family; 4168 4169 if (nf_tables_fill_set(skb, &ctx_set, set, 4170 NFT_MSG_NEWSET, 4171 NLM_F_MULTI) < 0) { 4172 cb->args[0] = idx; 4173 cb->args[2] = (unsigned long) table; 4174 goto done; 4175 } 4176 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4177 cont: 4178 idx++; 4179 } 4180 if (s_idx) 4181 s_idx = 0; 4182 } 4183 cb->args[1] = 1; 4184 done: 4185 rcu_read_unlock(); 4186 return skb->len; 4187 } 4188 4189 static int nf_tables_dump_sets_start(struct netlink_callback *cb) 4190 { 4191 struct nft_ctx *ctx_dump = NULL; 4192 4193 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC); 4194 if (ctx_dump == NULL) 4195 return -ENOMEM; 4196 4197 cb->data = ctx_dump; 4198 return 0; 4199 } 4200 4201 static int nf_tables_dump_sets_done(struct netlink_callback *cb) 4202 { 4203 kfree(cb->data); 4204 return 0; 4205 } 4206 4207 /* called with rcu_read_lock held */ 4208 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info, 4209 const struct nlattr * const nla[]) 4210 { 4211 struct netlink_ext_ack *extack = info->extack; 4212 u8 genmask = nft_genmask_cur(info->net); 4213 u8 family = info->nfmsg->nfgen_family; 4214 struct nft_table *table = NULL; 4215 struct net *net = info->net; 4216 const struct nft_set *set; 4217 struct sk_buff *skb2; 4218 struct nft_ctx ctx; 4219 int err; 4220 4221 if (nla[NFTA_SET_TABLE]) { 4222 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, 4223 genmask, 0); 4224 if (IS_ERR(table)) { 4225 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4226 return PTR_ERR(table); 4227 } 4228 } 4229 4230 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4231 4232 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 4233 struct netlink_dump_control c = { 4234 .start = nf_tables_dump_sets_start, 4235 .dump = nf_tables_dump_sets, 4236 .done = nf_tables_dump_sets_done, 4237 .data = &ctx, 4238 .module = THIS_MODULE, 4239 }; 4240 4241 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 4242 } 4243 4244 /* Only accept unspec with dump */ 4245 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC) 4246 return -EAFNOSUPPORT; 4247 if (!nla[NFTA_SET_TABLE]) 4248 return -EINVAL; 4249 4250 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); 4251 if (IS_ERR(set)) 4252 return PTR_ERR(set); 4253 4254 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 4255 if (skb2 == NULL) 4256 return -ENOMEM; 4257 4258 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0); 4259 if (err < 0) 4260 goto err_fill_set_info; 4261 4262 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 4263 4264 err_fill_set_info: 4265 kfree_skb(skb2); 4266 return err; 4267 } 4268 4269 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = { 4270 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 }, 4271 }; 4272 4273 static int nft_set_desc_concat_parse(const struct nlattr *attr, 4274 struct nft_set_desc *desc) 4275 { 4276 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1]; 4277 u32 len; 4278 int err; 4279 4280 if (desc->field_count >= ARRAY_SIZE(desc->field_len)) 4281 return -E2BIG; 4282 4283 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr, 4284 nft_concat_policy, NULL); 4285 if (err < 0) 4286 return err; 4287 4288 if (!tb[NFTA_SET_FIELD_LEN]) 4289 return -EINVAL; 4290 4291 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN])); 4292 if (!len || len > U8_MAX) 4293 return -EINVAL; 4294 4295 desc->field_len[desc->field_count++] = len; 4296 4297 return 0; 4298 } 4299 4300 static int nft_set_desc_concat(struct nft_set_desc *desc, 4301 const struct nlattr *nla) 4302 { 4303 struct nlattr *attr; 4304 u32 num_regs = 0; 4305 int rem, err, i; 4306 4307 nla_for_each_nested(attr, nla, rem) { 4308 if (nla_type(attr) != NFTA_LIST_ELEM) 4309 return -EINVAL; 4310 4311 err = nft_set_desc_concat_parse(attr, desc); 4312 if (err < 0) 4313 return err; 4314 } 4315 4316 for (i = 0; i < desc->field_count; i++) 4317 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32)); 4318 4319 if (num_regs > NFT_REG32_COUNT) 4320 return -E2BIG; 4321 4322 return 0; 4323 } 4324 4325 static int nf_tables_set_desc_parse(struct nft_set_desc *desc, 4326 const struct nlattr *nla) 4327 { 4328 struct nlattr *da[NFTA_SET_DESC_MAX + 1]; 4329 int err; 4330 4331 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla, 4332 nft_set_desc_policy, NULL); 4333 if (err < 0) 4334 return err; 4335 4336 if (da[NFTA_SET_DESC_SIZE] != NULL) 4337 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE])); 4338 if (da[NFTA_SET_DESC_CONCAT]) 4339 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]); 4340 4341 return err; 4342 } 4343 4344 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, 4345 const struct nlattr * const nla[]) 4346 { 4347 u32 ktype, dtype, flags, policy, gc_int, objtype; 4348 struct netlink_ext_ack *extack = info->extack; 4349 u8 genmask = nft_genmask_next(info->net); 4350 u8 family = info->nfmsg->nfgen_family; 4351 const struct nft_set_ops *ops; 4352 struct nft_expr *expr = NULL; 4353 struct net *net = info->net; 4354 struct nft_set_desc desc; 4355 struct nft_table *table; 4356 unsigned char *udata; 4357 struct nft_set *set; 4358 struct nft_ctx ctx; 4359 size_t alloc_size; 4360 u64 timeout; 4361 char *name; 4362 int err, i; 4363 u16 udlen; 4364 u64 size; 4365 4366 if (nla[NFTA_SET_TABLE] == NULL || 4367 nla[NFTA_SET_NAME] == NULL || 4368 nla[NFTA_SET_KEY_LEN] == NULL || 4369 nla[NFTA_SET_ID] == NULL) 4370 return -EINVAL; 4371 4372 memset(&desc, 0, sizeof(desc)); 4373 4374 ktype = NFT_DATA_VALUE; 4375 if (nla[NFTA_SET_KEY_TYPE] != NULL) { 4376 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE])); 4377 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK) 4378 return -EINVAL; 4379 } 4380 4381 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN])); 4382 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN) 4383 return -EINVAL; 4384 4385 flags = 0; 4386 if (nla[NFTA_SET_FLAGS] != NULL) { 4387 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS])); 4388 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | 4389 NFT_SET_INTERVAL | NFT_SET_TIMEOUT | 4390 NFT_SET_MAP | NFT_SET_EVAL | 4391 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR)) 4392 return -EOPNOTSUPP; 4393 /* Only one of these operations is supported */ 4394 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) == 4395 (NFT_SET_MAP | NFT_SET_OBJECT)) 4396 return -EOPNOTSUPP; 4397 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) == 4398 (NFT_SET_EVAL | NFT_SET_OBJECT)) 4399 return -EOPNOTSUPP; 4400 } 4401 4402 dtype = 0; 4403 if (nla[NFTA_SET_DATA_TYPE] != NULL) { 4404 if (!(flags & NFT_SET_MAP)) 4405 return -EINVAL; 4406 4407 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE])); 4408 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK && 4409 dtype != NFT_DATA_VERDICT) 4410 return -EINVAL; 4411 4412 if (dtype != NFT_DATA_VERDICT) { 4413 if (nla[NFTA_SET_DATA_LEN] == NULL) 4414 return -EINVAL; 4415 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN])); 4416 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN) 4417 return -EINVAL; 4418 } else 4419 desc.dlen = sizeof(struct nft_verdict); 4420 } else if (flags & NFT_SET_MAP) 4421 return -EINVAL; 4422 4423 if (nla[NFTA_SET_OBJ_TYPE] != NULL) { 4424 if (!(flags & NFT_SET_OBJECT)) 4425 return -EINVAL; 4426 4427 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE])); 4428 if (objtype == NFT_OBJECT_UNSPEC || 4429 objtype > NFT_OBJECT_MAX) 4430 return -EOPNOTSUPP; 4431 } else if (flags & NFT_SET_OBJECT) 4432 return -EINVAL; 4433 else 4434 objtype = NFT_OBJECT_UNSPEC; 4435 4436 timeout = 0; 4437 if (nla[NFTA_SET_TIMEOUT] != NULL) { 4438 if (!(flags & NFT_SET_TIMEOUT)) 4439 return -EINVAL; 4440 4441 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout); 4442 if (err) 4443 return err; 4444 } 4445 gc_int = 0; 4446 if (nla[NFTA_SET_GC_INTERVAL] != NULL) { 4447 if (!(flags & NFT_SET_TIMEOUT)) 4448 return -EINVAL; 4449 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL])); 4450 } 4451 4452 policy = NFT_SET_POL_PERFORMANCE; 4453 if (nla[NFTA_SET_POLICY] != NULL) 4454 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY])); 4455 4456 if (nla[NFTA_SET_DESC] != NULL) { 4457 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]); 4458 if (err < 0) 4459 return err; 4460 4461 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT)) 4462 return -EINVAL; 4463 } else if (flags & NFT_SET_CONCAT) { 4464 return -EINVAL; 4465 } 4466 4467 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS]) 4468 desc.expr = true; 4469 4470 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask, 4471 NETLINK_CB(skb).portid); 4472 if (IS_ERR(table)) { 4473 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4474 return PTR_ERR(table); 4475 } 4476 4477 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4478 4479 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask); 4480 if (IS_ERR(set)) { 4481 if (PTR_ERR(set) != -ENOENT) { 4482 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); 4483 return PTR_ERR(set); 4484 } 4485 } else { 4486 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 4487 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); 4488 return -EEXIST; 4489 } 4490 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 4491 return -EOPNOTSUPP; 4492 4493 return 0; 4494 } 4495 4496 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) 4497 return -ENOENT; 4498 4499 ops = nft_select_set_ops(&ctx, nla, &desc, policy); 4500 if (IS_ERR(ops)) 4501 return PTR_ERR(ops); 4502 4503 udlen = 0; 4504 if (nla[NFTA_SET_USERDATA]) 4505 udlen = nla_len(nla[NFTA_SET_USERDATA]); 4506 4507 size = 0; 4508 if (ops->privsize != NULL) 4509 size = ops->privsize(nla, &desc); 4510 alloc_size = sizeof(*set) + size + udlen; 4511 if (alloc_size < size || alloc_size > INT_MAX) 4512 return -ENOMEM; 4513 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT); 4514 if (!set) 4515 return -ENOMEM; 4516 4517 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT); 4518 if (!name) { 4519 err = -ENOMEM; 4520 goto err_set_name; 4521 } 4522 4523 err = nf_tables_set_alloc_name(&ctx, set, name); 4524 kfree(name); 4525 if (err < 0) 4526 goto err_set_name; 4527 4528 udata = NULL; 4529 if (udlen) { 4530 udata = set->data + size; 4531 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen); 4532 } 4533 4534 INIT_LIST_HEAD(&set->bindings); 4535 INIT_LIST_HEAD(&set->catchall_list); 4536 set->table = table; 4537 write_pnet(&set->net, net); 4538 set->ops = ops; 4539 set->ktype = ktype; 4540 set->klen = desc.klen; 4541 set->dtype = dtype; 4542 set->objtype = objtype; 4543 set->dlen = desc.dlen; 4544 set->flags = flags; 4545 set->size = desc.size; 4546 set->policy = policy; 4547 set->udlen = udlen; 4548 set->udata = udata; 4549 set->timeout = timeout; 4550 set->gc_int = gc_int; 4551 4552 set->field_count = desc.field_count; 4553 for (i = 0; i < desc.field_count; i++) 4554 set->field_len[i] = desc.field_len[i]; 4555 4556 err = ops->init(set, &desc, nla); 4557 if (err < 0) 4558 goto err_set_init; 4559 4560 if (nla[NFTA_SET_EXPR]) { 4561 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]); 4562 if (IS_ERR(expr)) { 4563 err = PTR_ERR(expr); 4564 goto err_set_expr_alloc; 4565 } 4566 set->exprs[0] = expr; 4567 set->num_exprs++; 4568 } else if (nla[NFTA_SET_EXPRESSIONS]) { 4569 struct nft_expr *expr; 4570 struct nlattr *tmp; 4571 int left; 4572 4573 if (!(flags & NFT_SET_EXPR)) { 4574 err = -EINVAL; 4575 goto err_set_expr_alloc; 4576 } 4577 i = 0; 4578 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) { 4579 if (i == NFT_SET_EXPR_MAX) { 4580 err = -E2BIG; 4581 goto err_set_expr_alloc; 4582 } 4583 if (nla_type(tmp) != NFTA_LIST_ELEM) { 4584 err = -EINVAL; 4585 goto err_set_expr_alloc; 4586 } 4587 expr = nft_set_elem_expr_alloc(&ctx, set, tmp); 4588 if (IS_ERR(expr)) { 4589 err = PTR_ERR(expr); 4590 goto err_set_expr_alloc; 4591 } 4592 set->exprs[i++] = expr; 4593 set->num_exprs++; 4594 } 4595 } 4596 4597 set->handle = nf_tables_alloc_handle(table); 4598 4599 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set); 4600 if (err < 0) 4601 goto err_set_expr_alloc; 4602 4603 list_add_tail_rcu(&set->list, &table->sets); 4604 table->use++; 4605 return 0; 4606 4607 err_set_expr_alloc: 4608 for (i = 0; i < set->num_exprs; i++) 4609 nft_expr_destroy(&ctx, set->exprs[i]); 4610 4611 ops->destroy(set); 4612 err_set_init: 4613 kfree(set->name); 4614 err_set_name: 4615 kvfree(set); 4616 return err; 4617 } 4618 4619 struct nft_set_elem_catchall { 4620 struct list_head list; 4621 struct rcu_head rcu; 4622 void *elem; 4623 }; 4624 4625 static void nft_set_catchall_destroy(const struct nft_ctx *ctx, 4626 struct nft_set *set) 4627 { 4628 struct nft_set_elem_catchall *next, *catchall; 4629 4630 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 4631 list_del_rcu(&catchall->list); 4632 nft_set_elem_destroy(set, catchall->elem, true); 4633 kfree_rcu(catchall, rcu); 4634 } 4635 } 4636 4637 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set) 4638 { 4639 int i; 4640 4641 if (WARN_ON(set->use > 0)) 4642 return; 4643 4644 for (i = 0; i < set->num_exprs; i++) 4645 nft_expr_destroy(ctx, set->exprs[i]); 4646 4647 set->ops->destroy(set); 4648 nft_set_catchall_destroy(ctx, set); 4649 kfree(set->name); 4650 kvfree(set); 4651 } 4652 4653 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info, 4654 const struct nlattr * const nla[]) 4655 { 4656 struct netlink_ext_ack *extack = info->extack; 4657 u8 genmask = nft_genmask_next(info->net); 4658 u8 family = info->nfmsg->nfgen_family; 4659 struct net *net = info->net; 4660 const struct nlattr *attr; 4661 struct nft_table *table; 4662 struct nft_set *set; 4663 struct nft_ctx ctx; 4664 4665 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC) 4666 return -EAFNOSUPPORT; 4667 4668 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, 4669 genmask, NETLINK_CB(skb).portid); 4670 if (IS_ERR(table)) { 4671 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]); 4672 return PTR_ERR(table); 4673 } 4674 4675 if (nla[NFTA_SET_HANDLE]) { 4676 attr = nla[NFTA_SET_HANDLE]; 4677 set = nft_set_lookup_byhandle(table, attr, genmask); 4678 } else { 4679 attr = nla[NFTA_SET_NAME]; 4680 set = nft_set_lookup(table, attr, genmask); 4681 } 4682 4683 if (IS_ERR(set)) { 4684 NL_SET_BAD_ATTR(extack, attr); 4685 return PTR_ERR(set); 4686 } 4687 if (set->use || 4688 (info->nlh->nlmsg_flags & NLM_F_NONREC && 4689 atomic_read(&set->nelems) > 0)) { 4690 NL_SET_BAD_ATTR(extack, attr); 4691 return -EBUSY; 4692 } 4693 4694 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 4695 4696 return nft_delset(&ctx, set); 4697 } 4698 4699 static int nft_validate_register_store(const struct nft_ctx *ctx, 4700 enum nft_registers reg, 4701 const struct nft_data *data, 4702 enum nft_data_types type, 4703 unsigned int len); 4704 4705 static int nft_setelem_data_validate(const struct nft_ctx *ctx, 4706 struct nft_set *set, 4707 struct nft_set_elem *elem) 4708 { 4709 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 4710 enum nft_registers dreg; 4711 4712 dreg = nft_type_to_reg(set->dtype); 4713 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext), 4714 set->dtype == NFT_DATA_VERDICT ? 4715 NFT_DATA_VERDICT : NFT_DATA_VALUE, 4716 set->dlen); 4717 } 4718 4719 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, 4720 struct nft_set *set, 4721 const struct nft_set_iter *iter, 4722 struct nft_set_elem *elem) 4723 { 4724 return nft_setelem_data_validate(ctx, set, elem); 4725 } 4726 4727 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx, 4728 struct nft_set *set) 4729 { 4730 u8 genmask = nft_genmask_next(ctx->net); 4731 struct nft_set_elem_catchall *catchall; 4732 struct nft_set_elem elem; 4733 struct nft_set_ext *ext; 4734 int ret = 0; 4735 4736 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 4737 ext = nft_set_elem_ext(set, catchall->elem); 4738 if (!nft_set_elem_active(ext, genmask)) 4739 continue; 4740 4741 elem.priv = catchall->elem; 4742 ret = nft_setelem_data_validate(ctx, set, &elem); 4743 if (ret < 0) 4744 break; 4745 } 4746 4747 return ret; 4748 } 4749 4750 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 4751 struct nft_set_binding *binding) 4752 { 4753 struct nft_set_binding *i; 4754 struct nft_set_iter iter; 4755 4756 if (set->use == UINT_MAX) 4757 return -EOVERFLOW; 4758 4759 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set)) 4760 return -EBUSY; 4761 4762 if (binding->flags & NFT_SET_MAP) { 4763 /* If the set is already bound to the same chain all 4764 * jumps are already validated for that chain. 4765 */ 4766 list_for_each_entry(i, &set->bindings, list) { 4767 if (i->flags & NFT_SET_MAP && 4768 i->chain == binding->chain) 4769 goto bind; 4770 } 4771 4772 iter.genmask = nft_genmask_next(ctx->net); 4773 iter.skip = 0; 4774 iter.count = 0; 4775 iter.err = 0; 4776 iter.fn = nf_tables_bind_check_setelem; 4777 4778 set->ops->walk(ctx, set, &iter); 4779 if (!iter.err) 4780 iter.err = nft_set_catchall_bind_check(ctx, set); 4781 4782 if (iter.err < 0) 4783 return iter.err; 4784 } 4785 bind: 4786 binding->chain = ctx->chain; 4787 list_add_tail_rcu(&binding->list, &set->bindings); 4788 nft_set_trans_bind(ctx, set); 4789 set->use++; 4790 4791 return 0; 4792 } 4793 EXPORT_SYMBOL_GPL(nf_tables_bind_set); 4794 4795 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set, 4796 struct nft_set_binding *binding, bool event) 4797 { 4798 list_del_rcu(&binding->list); 4799 4800 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) { 4801 list_del_rcu(&set->list); 4802 if (event) 4803 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET, 4804 GFP_KERNEL); 4805 } 4806 } 4807 4808 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 4809 struct nft_set_binding *binding, 4810 enum nft_trans_phase phase) 4811 { 4812 switch (phase) { 4813 case NFT_TRANS_PREPARE: 4814 set->use--; 4815 return; 4816 case NFT_TRANS_ABORT: 4817 case NFT_TRANS_RELEASE: 4818 set->use--; 4819 fallthrough; 4820 default: 4821 nf_tables_unbind_set(ctx, set, binding, 4822 phase == NFT_TRANS_COMMIT); 4823 } 4824 } 4825 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set); 4826 4827 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set) 4828 { 4829 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) 4830 nft_set_destroy(ctx, set); 4831 } 4832 EXPORT_SYMBOL_GPL(nf_tables_destroy_set); 4833 4834 const struct nft_set_ext_type nft_set_ext_types[] = { 4835 [NFT_SET_EXT_KEY] = { 4836 .align = __alignof__(u32), 4837 }, 4838 [NFT_SET_EXT_DATA] = { 4839 .align = __alignof__(u32), 4840 }, 4841 [NFT_SET_EXT_EXPRESSIONS] = { 4842 .align = __alignof__(struct nft_set_elem_expr), 4843 }, 4844 [NFT_SET_EXT_OBJREF] = { 4845 .len = sizeof(struct nft_object *), 4846 .align = __alignof__(struct nft_object *), 4847 }, 4848 [NFT_SET_EXT_FLAGS] = { 4849 .len = sizeof(u8), 4850 .align = __alignof__(u8), 4851 }, 4852 [NFT_SET_EXT_TIMEOUT] = { 4853 .len = sizeof(u64), 4854 .align = __alignof__(u64), 4855 }, 4856 [NFT_SET_EXT_EXPIRATION] = { 4857 .len = sizeof(u64), 4858 .align = __alignof__(u64), 4859 }, 4860 [NFT_SET_EXT_USERDATA] = { 4861 .len = sizeof(struct nft_userdata), 4862 .align = __alignof__(struct nft_userdata), 4863 }, 4864 [NFT_SET_EXT_KEY_END] = { 4865 .align = __alignof__(u32), 4866 }, 4867 }; 4868 4869 /* 4870 * Set elements 4871 */ 4872 4873 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = { 4874 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED }, 4875 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED }, 4876 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 }, 4877 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 }, 4878 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 }, 4879 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY, 4880 .len = NFT_USERDATA_MAXLEN }, 4881 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED }, 4882 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING, 4883 .len = NFT_OBJ_MAXNAMELEN - 1 }, 4884 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED }, 4885 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED }, 4886 }; 4887 4888 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = { 4889 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING, 4890 .len = NFT_TABLE_MAXNAMELEN - 1 }, 4891 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING, 4892 .len = NFT_SET_MAXNAMELEN - 1 }, 4893 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED }, 4894 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 }, 4895 }; 4896 4897 static int nft_set_elem_expr_dump(struct sk_buff *skb, 4898 const struct nft_set *set, 4899 const struct nft_set_ext *ext) 4900 { 4901 struct nft_set_elem_expr *elem_expr; 4902 u32 size, num_exprs = 0; 4903 struct nft_expr *expr; 4904 struct nlattr *nest; 4905 4906 elem_expr = nft_set_ext_expr(ext); 4907 nft_setelem_expr_foreach(expr, elem_expr, size) 4908 num_exprs++; 4909 4910 if (num_exprs == 1) { 4911 expr = nft_setelem_expr_at(elem_expr, 0); 4912 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0) 4913 return -1; 4914 4915 return 0; 4916 } else if (num_exprs > 1) { 4917 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS); 4918 if (nest == NULL) 4919 goto nla_put_failure; 4920 4921 nft_setelem_expr_foreach(expr, elem_expr, size) { 4922 expr = nft_setelem_expr_at(elem_expr, size); 4923 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0) 4924 goto nla_put_failure; 4925 } 4926 nla_nest_end(skb, nest); 4927 } 4928 return 0; 4929 4930 nla_put_failure: 4931 return -1; 4932 } 4933 4934 static int nf_tables_fill_setelem(struct sk_buff *skb, 4935 const struct nft_set *set, 4936 const struct nft_set_elem *elem) 4937 { 4938 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 4939 unsigned char *b = skb_tail_pointer(skb); 4940 struct nlattr *nest; 4941 4942 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); 4943 if (nest == NULL) 4944 goto nla_put_failure; 4945 4946 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) && 4947 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext), 4948 NFT_DATA_VALUE, set->klen) < 0) 4949 goto nla_put_failure; 4950 4951 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) && 4952 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext), 4953 NFT_DATA_VALUE, set->klen) < 0) 4954 goto nla_put_failure; 4955 4956 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 4957 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext), 4958 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE, 4959 set->dlen) < 0) 4960 goto nla_put_failure; 4961 4962 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) && 4963 nft_set_elem_expr_dump(skb, set, ext)) 4964 goto nla_put_failure; 4965 4966 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && 4967 nla_put_string(skb, NFTA_SET_ELEM_OBJREF, 4968 (*nft_set_ext_obj(ext))->key.name) < 0) 4969 goto nla_put_failure; 4970 4971 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 4972 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS, 4973 htonl(*nft_set_ext_flags(ext)))) 4974 goto nla_put_failure; 4975 4976 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && 4977 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, 4978 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)), 4979 NFTA_SET_ELEM_PAD)) 4980 goto nla_put_failure; 4981 4982 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { 4983 u64 expires, now = get_jiffies_64(); 4984 4985 expires = *nft_set_ext_expiration(ext); 4986 if (time_before64(now, expires)) 4987 expires -= now; 4988 else 4989 expires = 0; 4990 4991 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION, 4992 nf_jiffies64_to_msecs(expires), 4993 NFTA_SET_ELEM_PAD)) 4994 goto nla_put_failure; 4995 } 4996 4997 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { 4998 struct nft_userdata *udata; 4999 5000 udata = nft_set_ext_userdata(ext); 5001 if (nla_put(skb, NFTA_SET_ELEM_USERDATA, 5002 udata->len + 1, udata->data)) 5003 goto nla_put_failure; 5004 } 5005 5006 nla_nest_end(skb, nest); 5007 return 0; 5008 5009 nla_put_failure: 5010 nlmsg_trim(skb, b); 5011 return -EMSGSIZE; 5012 } 5013 5014 struct nft_set_dump_args { 5015 const struct netlink_callback *cb; 5016 struct nft_set_iter iter; 5017 struct sk_buff *skb; 5018 }; 5019 5020 static int nf_tables_dump_setelem(const struct nft_ctx *ctx, 5021 struct nft_set *set, 5022 const struct nft_set_iter *iter, 5023 struct nft_set_elem *elem) 5024 { 5025 struct nft_set_dump_args *args; 5026 5027 args = container_of(iter, struct nft_set_dump_args, iter); 5028 return nf_tables_fill_setelem(args->skb, set, elem); 5029 } 5030 5031 struct nft_set_dump_ctx { 5032 const struct nft_set *set; 5033 struct nft_ctx ctx; 5034 }; 5035 5036 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb, 5037 const struct nft_set *set) 5038 { 5039 struct nft_set_elem_catchall *catchall; 5040 u8 genmask = nft_genmask_cur(net); 5041 struct nft_set_elem elem; 5042 struct nft_set_ext *ext; 5043 int ret = 0; 5044 5045 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5046 ext = nft_set_elem_ext(set, catchall->elem); 5047 if (!nft_set_elem_active(ext, genmask) || 5048 nft_set_elem_expired(ext)) 5049 continue; 5050 5051 elem.priv = catchall->elem; 5052 ret = nf_tables_fill_setelem(skb, set, &elem); 5053 break; 5054 } 5055 5056 return ret; 5057 } 5058 5059 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb) 5060 { 5061 struct nft_set_dump_ctx *dump_ctx = cb->data; 5062 struct net *net = sock_net(skb->sk); 5063 struct nftables_pernet *nft_net; 5064 struct nft_table *table; 5065 struct nft_set *set; 5066 struct nft_set_dump_args args; 5067 bool set_found = false; 5068 struct nlmsghdr *nlh; 5069 struct nlattr *nest; 5070 u32 portid, seq; 5071 int event; 5072 5073 rcu_read_lock(); 5074 nft_net = nft_pernet(net); 5075 cb->seq = READ_ONCE(nft_net->base_seq); 5076 5077 list_for_each_entry_rcu(table, &nft_net->tables, list) { 5078 if (dump_ctx->ctx.family != NFPROTO_UNSPEC && 5079 dump_ctx->ctx.family != table->family) 5080 continue; 5081 5082 if (table != dump_ctx->ctx.table) 5083 continue; 5084 5085 list_for_each_entry_rcu(set, &table->sets, list) { 5086 if (set == dump_ctx->set) { 5087 set_found = true; 5088 break; 5089 } 5090 } 5091 break; 5092 } 5093 5094 if (!set_found) { 5095 rcu_read_unlock(); 5096 return -ENOENT; 5097 } 5098 5099 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM); 5100 portid = NETLINK_CB(cb->skb).portid; 5101 seq = cb->nlh->nlmsg_seq; 5102 5103 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI, 5104 table->family, NFNETLINK_V0, nft_base_seq(net)); 5105 if (!nlh) 5106 goto nla_put_failure; 5107 5108 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name)) 5109 goto nla_put_failure; 5110 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name)) 5111 goto nla_put_failure; 5112 5113 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS); 5114 if (nest == NULL) 5115 goto nla_put_failure; 5116 5117 args.cb = cb; 5118 args.skb = skb; 5119 args.iter.genmask = nft_genmask_cur(net); 5120 args.iter.skip = cb->args[0]; 5121 args.iter.count = 0; 5122 args.iter.err = 0; 5123 args.iter.fn = nf_tables_dump_setelem; 5124 set->ops->walk(&dump_ctx->ctx, set, &args.iter); 5125 5126 if (!args.iter.err && args.iter.count == cb->args[0]) 5127 args.iter.err = nft_set_catchall_dump(net, skb, set); 5128 rcu_read_unlock(); 5129 5130 nla_nest_end(skb, nest); 5131 nlmsg_end(skb, nlh); 5132 5133 if (args.iter.err && args.iter.err != -EMSGSIZE) 5134 return args.iter.err; 5135 if (args.iter.count == cb->args[0]) 5136 return 0; 5137 5138 cb->args[0] = args.iter.count; 5139 return skb->len; 5140 5141 nla_put_failure: 5142 rcu_read_unlock(); 5143 return -ENOSPC; 5144 } 5145 5146 static int nf_tables_dump_set_start(struct netlink_callback *cb) 5147 { 5148 struct nft_set_dump_ctx *dump_ctx = cb->data; 5149 5150 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC); 5151 5152 return cb->data ? 0 : -ENOMEM; 5153 } 5154 5155 static int nf_tables_dump_set_done(struct netlink_callback *cb) 5156 { 5157 kfree(cb->data); 5158 return 0; 5159 } 5160 5161 static int nf_tables_fill_setelem_info(struct sk_buff *skb, 5162 const struct nft_ctx *ctx, u32 seq, 5163 u32 portid, int event, u16 flags, 5164 const struct nft_set *set, 5165 const struct nft_set_elem *elem) 5166 { 5167 struct nlmsghdr *nlh; 5168 struct nlattr *nest; 5169 int err; 5170 5171 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 5172 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family, 5173 NFNETLINK_V0, nft_base_seq(ctx->net)); 5174 if (!nlh) 5175 goto nla_put_failure; 5176 5177 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name)) 5178 goto nla_put_failure; 5179 if (nla_put_string(skb, NFTA_SET_NAME, set->name)) 5180 goto nla_put_failure; 5181 5182 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS); 5183 if (nest == NULL) 5184 goto nla_put_failure; 5185 5186 err = nf_tables_fill_setelem(skb, set, elem); 5187 if (err < 0) 5188 goto nla_put_failure; 5189 5190 nla_nest_end(skb, nest); 5191 5192 nlmsg_end(skb, nlh); 5193 return 0; 5194 5195 nla_put_failure: 5196 nlmsg_trim(skb, nlh); 5197 return -1; 5198 } 5199 5200 static int nft_setelem_parse_flags(const struct nft_set *set, 5201 const struct nlattr *attr, u32 *flags) 5202 { 5203 if (attr == NULL) 5204 return 0; 5205 5206 *flags = ntohl(nla_get_be32(attr)); 5207 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) 5208 return -EOPNOTSUPP; 5209 if (!(set->flags & NFT_SET_INTERVAL) && 5210 *flags & NFT_SET_ELEM_INTERVAL_END) 5211 return -EINVAL; 5212 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) == 5213 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) 5214 return -EINVAL; 5215 5216 return 0; 5217 } 5218 5219 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set, 5220 struct nft_data *key, struct nlattr *attr) 5221 { 5222 struct nft_data_desc desc = { 5223 .type = NFT_DATA_VALUE, 5224 .size = NFT_DATA_VALUE_MAXLEN, 5225 .len = set->klen, 5226 }; 5227 5228 return nft_data_init(ctx, key, &desc, attr); 5229 } 5230 5231 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set, 5232 struct nft_data_desc *desc, 5233 struct nft_data *data, 5234 struct nlattr *attr) 5235 { 5236 u32 dtype; 5237 5238 if (set->dtype == NFT_DATA_VERDICT) 5239 dtype = NFT_DATA_VERDICT; 5240 else 5241 dtype = NFT_DATA_VALUE; 5242 5243 desc->type = dtype; 5244 desc->size = NFT_DATA_VALUE_MAXLEN; 5245 desc->len = set->dlen; 5246 desc->flags = NFT_DATA_DESC_SETELEM; 5247 5248 return nft_data_init(ctx, data, desc, attr); 5249 } 5250 5251 static void *nft_setelem_catchall_get(const struct net *net, 5252 const struct nft_set *set) 5253 { 5254 struct nft_set_elem_catchall *catchall; 5255 u8 genmask = nft_genmask_cur(net); 5256 struct nft_set_ext *ext; 5257 void *priv = NULL; 5258 5259 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5260 ext = nft_set_elem_ext(set, catchall->elem); 5261 if (!nft_set_elem_active(ext, genmask) || 5262 nft_set_elem_expired(ext)) 5263 continue; 5264 5265 priv = catchall->elem; 5266 break; 5267 } 5268 5269 return priv; 5270 } 5271 5272 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set, 5273 struct nft_set_elem *elem, u32 flags) 5274 { 5275 void *priv; 5276 5277 if (!(flags & NFT_SET_ELEM_CATCHALL)) { 5278 priv = set->ops->get(ctx->net, set, elem, flags); 5279 if (IS_ERR(priv)) 5280 return PTR_ERR(priv); 5281 } else { 5282 priv = nft_setelem_catchall_get(ctx->net, set); 5283 if (!priv) 5284 return -ENOENT; 5285 } 5286 elem->priv = priv; 5287 5288 return 0; 5289 } 5290 5291 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set, 5292 const struct nlattr *attr) 5293 { 5294 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 5295 struct nft_set_elem elem; 5296 struct sk_buff *skb; 5297 uint32_t flags = 0; 5298 int err; 5299 5300 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 5301 nft_set_elem_policy, NULL); 5302 if (err < 0) 5303 return err; 5304 5305 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 5306 if (err < 0) 5307 return err; 5308 5309 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 5310 return -EINVAL; 5311 5312 if (nla[NFTA_SET_ELEM_KEY]) { 5313 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 5314 nla[NFTA_SET_ELEM_KEY]); 5315 if (err < 0) 5316 return err; 5317 } 5318 5319 if (nla[NFTA_SET_ELEM_KEY_END]) { 5320 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 5321 nla[NFTA_SET_ELEM_KEY_END]); 5322 if (err < 0) 5323 return err; 5324 } 5325 5326 err = nft_setelem_get(ctx, set, &elem, flags); 5327 if (err < 0) 5328 return err; 5329 5330 err = -ENOMEM; 5331 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 5332 if (skb == NULL) 5333 return err; 5334 5335 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid, 5336 NFT_MSG_NEWSETELEM, 0, set, &elem); 5337 if (err < 0) 5338 goto err_fill_setelem; 5339 5340 return nfnetlink_unicast(skb, ctx->net, ctx->portid); 5341 5342 err_fill_setelem: 5343 kfree_skb(skb); 5344 return err; 5345 } 5346 5347 /* called with rcu_read_lock held */ 5348 static int nf_tables_getsetelem(struct sk_buff *skb, 5349 const struct nfnl_info *info, 5350 const struct nlattr * const nla[]) 5351 { 5352 struct netlink_ext_ack *extack = info->extack; 5353 u8 genmask = nft_genmask_cur(info->net); 5354 u8 family = info->nfmsg->nfgen_family; 5355 struct net *net = info->net; 5356 struct nft_table *table; 5357 struct nft_set *set; 5358 struct nlattr *attr; 5359 struct nft_ctx ctx; 5360 int rem, err = 0; 5361 5362 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 5363 genmask, NETLINK_CB(skb).portid); 5364 if (IS_ERR(table)) { 5365 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 5366 return PTR_ERR(table); 5367 } 5368 5369 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask); 5370 if (IS_ERR(set)) 5371 return PTR_ERR(set); 5372 5373 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 5374 5375 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 5376 struct netlink_dump_control c = { 5377 .start = nf_tables_dump_set_start, 5378 .dump = nf_tables_dump_set, 5379 .done = nf_tables_dump_set_done, 5380 .module = THIS_MODULE, 5381 }; 5382 struct nft_set_dump_ctx dump_ctx = { 5383 .set = set, 5384 .ctx = ctx, 5385 }; 5386 5387 c.data = &dump_ctx; 5388 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 5389 } 5390 5391 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) 5392 return -EINVAL; 5393 5394 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 5395 err = nft_get_set_elem(&ctx, set, attr); 5396 if (err < 0) { 5397 NL_SET_BAD_ATTR(extack, attr); 5398 break; 5399 } 5400 } 5401 5402 return err; 5403 } 5404 5405 static void nf_tables_setelem_notify(const struct nft_ctx *ctx, 5406 const struct nft_set *set, 5407 const struct nft_set_elem *elem, 5408 int event) 5409 { 5410 struct nftables_pernet *nft_net; 5411 struct net *net = ctx->net; 5412 u32 portid = ctx->portid; 5413 struct sk_buff *skb; 5414 u16 flags = 0; 5415 int err; 5416 5417 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 5418 return; 5419 5420 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 5421 if (skb == NULL) 5422 goto err; 5423 5424 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 5425 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 5426 5427 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags, 5428 set, elem); 5429 if (err < 0) { 5430 kfree_skb(skb); 5431 goto err; 5432 } 5433 5434 nft_net = nft_pernet(net); 5435 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 5436 return; 5437 err: 5438 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 5439 } 5440 5441 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx, 5442 int msg_type, 5443 struct nft_set *set) 5444 { 5445 struct nft_trans *trans; 5446 5447 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem)); 5448 if (trans == NULL) 5449 return NULL; 5450 5451 nft_trans_elem_set(trans) = set; 5452 return trans; 5453 } 5454 5455 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 5456 const struct nft_set *set, 5457 const struct nlattr *attr) 5458 { 5459 struct nft_expr *expr; 5460 int err; 5461 5462 expr = nft_expr_init(ctx, attr); 5463 if (IS_ERR(expr)) 5464 return expr; 5465 5466 err = -EOPNOTSUPP; 5467 if (expr->ops->type->flags & NFT_EXPR_GC) { 5468 if (set->flags & NFT_SET_TIMEOUT) 5469 goto err_set_elem_expr; 5470 if (!set->ops->gc_init) 5471 goto err_set_elem_expr; 5472 set->ops->gc_init(set); 5473 } 5474 5475 return expr; 5476 5477 err_set_elem_expr: 5478 nft_expr_destroy(ctx, expr); 5479 return ERR_PTR(err); 5480 } 5481 5482 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len) 5483 { 5484 len += nft_set_ext_types[id].len; 5485 if (len > tmpl->ext_len[id] || 5486 len > U8_MAX) 5487 return -1; 5488 5489 return 0; 5490 } 5491 5492 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id, 5493 void *to, const void *from, u32 len) 5494 { 5495 if (nft_set_ext_check(tmpl, id, len) < 0) 5496 return -1; 5497 5498 memcpy(to, from, len); 5499 5500 return 0; 5501 } 5502 5503 void *nft_set_elem_init(const struct nft_set *set, 5504 const struct nft_set_ext_tmpl *tmpl, 5505 const u32 *key, const u32 *key_end, 5506 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp) 5507 { 5508 struct nft_set_ext *ext; 5509 void *elem; 5510 5511 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp); 5512 if (elem == NULL) 5513 return ERR_PTR(-ENOMEM); 5514 5515 ext = nft_set_elem_ext(set, elem); 5516 nft_set_ext_init(ext, tmpl); 5517 5518 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) && 5519 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY, 5520 nft_set_ext_key(ext), key, set->klen) < 0) 5521 goto err_ext_check; 5522 5523 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) && 5524 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END, 5525 nft_set_ext_key_end(ext), key_end, set->klen) < 0) 5526 goto err_ext_check; 5527 5528 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 5529 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA, 5530 nft_set_ext_data(ext), data, set->dlen) < 0) 5531 goto err_ext_check; 5532 5533 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { 5534 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration; 5535 if (expiration == 0) 5536 *nft_set_ext_expiration(ext) += timeout; 5537 } 5538 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) 5539 *nft_set_ext_timeout(ext) = timeout; 5540 5541 return elem; 5542 5543 err_ext_check: 5544 kfree(elem); 5545 5546 return ERR_PTR(-EINVAL); 5547 } 5548 5549 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx, 5550 struct nft_expr *expr) 5551 { 5552 if (expr->ops->destroy_clone) { 5553 expr->ops->destroy_clone(ctx, expr); 5554 module_put(expr->ops->type->owner); 5555 } else { 5556 nf_tables_expr_destroy(ctx, expr); 5557 } 5558 } 5559 5560 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, 5561 struct nft_set_elem_expr *elem_expr) 5562 { 5563 struct nft_expr *expr; 5564 u32 size; 5565 5566 nft_setelem_expr_foreach(expr, elem_expr, size) 5567 __nft_set_elem_expr_destroy(ctx, expr); 5568 } 5569 5570 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 5571 bool destroy_expr) 5572 { 5573 struct nft_set_ext *ext = nft_set_elem_ext(set, elem); 5574 struct nft_ctx ctx = { 5575 .net = read_pnet(&set->net), 5576 .family = set->table->family, 5577 }; 5578 5579 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE); 5580 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 5581 nft_data_release(nft_set_ext_data(ext), set->dtype); 5582 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) 5583 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext)); 5584 5585 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 5586 (*nft_set_ext_obj(ext))->use--; 5587 kfree(elem); 5588 } 5589 EXPORT_SYMBOL_GPL(nft_set_elem_destroy); 5590 5591 /* Only called from commit path, nft_setelem_data_deactivate() already deals 5592 * with the refcounting from the preparation phase. 5593 */ 5594 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, 5595 const struct nft_set *set, void *elem) 5596 { 5597 struct nft_set_ext *ext = nft_set_elem_ext(set, elem); 5598 5599 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) 5600 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext)); 5601 5602 kfree(elem); 5603 } 5604 5605 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 5606 struct nft_expr *expr_array[]) 5607 { 5608 struct nft_expr *expr; 5609 int err, i, k; 5610 5611 for (i = 0; i < set->num_exprs; i++) { 5612 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT); 5613 if (!expr) 5614 goto err_expr; 5615 5616 err = nft_expr_clone(expr, set->exprs[i]); 5617 if (err < 0) { 5618 kfree(expr); 5619 goto err_expr; 5620 } 5621 expr_array[i] = expr; 5622 } 5623 5624 return 0; 5625 5626 err_expr: 5627 for (k = i - 1; k >= 0; k--) 5628 nft_expr_destroy(ctx, expr_array[k]); 5629 5630 return -ENOMEM; 5631 } 5632 5633 static int nft_set_elem_expr_setup(struct nft_ctx *ctx, 5634 const struct nft_set_ext_tmpl *tmpl, 5635 const struct nft_set_ext *ext, 5636 struct nft_expr *expr_array[], 5637 u32 num_exprs) 5638 { 5639 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext); 5640 u32 len = sizeof(struct nft_set_elem_expr); 5641 struct nft_expr *expr; 5642 int i, err; 5643 5644 if (num_exprs == 0) 5645 return 0; 5646 5647 for (i = 0; i < num_exprs; i++) 5648 len += expr_array[i]->ops->size; 5649 5650 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0) 5651 return -EINVAL; 5652 5653 for (i = 0; i < num_exprs; i++) { 5654 expr = nft_setelem_expr_at(elem_expr, elem_expr->size); 5655 err = nft_expr_clone(expr, expr_array[i]); 5656 if (err < 0) 5657 goto err_elem_expr_setup; 5658 5659 elem_expr->size += expr_array[i]->ops->size; 5660 nft_expr_destroy(ctx, expr_array[i]); 5661 expr_array[i] = NULL; 5662 } 5663 5664 return 0; 5665 5666 err_elem_expr_setup: 5667 for (; i < num_exprs; i++) { 5668 nft_expr_destroy(ctx, expr_array[i]); 5669 expr_array[i] = NULL; 5670 } 5671 5672 return -ENOMEM; 5673 } 5674 5675 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 5676 const struct nft_set *set) 5677 { 5678 struct nft_set_elem_catchall *catchall; 5679 u8 genmask = nft_genmask_cur(net); 5680 struct nft_set_ext *ext; 5681 5682 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 5683 ext = nft_set_elem_ext(set, catchall->elem); 5684 if (nft_set_elem_active(ext, genmask) && 5685 !nft_set_elem_expired(ext)) 5686 return ext; 5687 } 5688 5689 return NULL; 5690 } 5691 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup); 5692 5693 void *nft_set_catchall_gc(const struct nft_set *set) 5694 { 5695 struct nft_set_elem_catchall *catchall, *next; 5696 struct nft_set_ext *ext; 5697 void *elem = NULL; 5698 5699 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 5700 ext = nft_set_elem_ext(set, catchall->elem); 5701 5702 if (!nft_set_elem_expired(ext) || 5703 nft_set_elem_mark_busy(ext)) 5704 continue; 5705 5706 elem = catchall->elem; 5707 list_del_rcu(&catchall->list); 5708 kfree_rcu(catchall, rcu); 5709 break; 5710 } 5711 5712 return elem; 5713 } 5714 EXPORT_SYMBOL_GPL(nft_set_catchall_gc); 5715 5716 static int nft_setelem_catchall_insert(const struct net *net, 5717 struct nft_set *set, 5718 const struct nft_set_elem *elem, 5719 struct nft_set_ext **pext) 5720 { 5721 struct nft_set_elem_catchall *catchall; 5722 u8 genmask = nft_genmask_next(net); 5723 struct nft_set_ext *ext; 5724 5725 list_for_each_entry(catchall, &set->catchall_list, list) { 5726 ext = nft_set_elem_ext(set, catchall->elem); 5727 if (nft_set_elem_active(ext, genmask)) { 5728 *pext = ext; 5729 return -EEXIST; 5730 } 5731 } 5732 5733 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL); 5734 if (!catchall) 5735 return -ENOMEM; 5736 5737 catchall->elem = elem->priv; 5738 list_add_tail_rcu(&catchall->list, &set->catchall_list); 5739 5740 return 0; 5741 } 5742 5743 static int nft_setelem_insert(const struct net *net, 5744 struct nft_set *set, 5745 const struct nft_set_elem *elem, 5746 struct nft_set_ext **ext, unsigned int flags) 5747 { 5748 int ret; 5749 5750 if (flags & NFT_SET_ELEM_CATCHALL) 5751 ret = nft_setelem_catchall_insert(net, set, elem, ext); 5752 else 5753 ret = set->ops->insert(net, set, elem, ext); 5754 5755 return ret; 5756 } 5757 5758 static bool nft_setelem_is_catchall(const struct nft_set *set, 5759 const struct nft_set_elem *elem) 5760 { 5761 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 5762 5763 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 5764 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL) 5765 return true; 5766 5767 return false; 5768 } 5769 5770 static void nft_setelem_activate(struct net *net, struct nft_set *set, 5771 struct nft_set_elem *elem) 5772 { 5773 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 5774 5775 if (nft_setelem_is_catchall(set, elem)) { 5776 nft_set_elem_change_active(net, set, ext); 5777 nft_set_elem_clear_busy(ext); 5778 } else { 5779 set->ops->activate(net, set, elem); 5780 } 5781 } 5782 5783 static int nft_setelem_catchall_deactivate(const struct net *net, 5784 struct nft_set *set, 5785 struct nft_set_elem *elem) 5786 { 5787 struct nft_set_elem_catchall *catchall; 5788 struct nft_set_ext *ext; 5789 5790 list_for_each_entry(catchall, &set->catchall_list, list) { 5791 ext = nft_set_elem_ext(set, catchall->elem); 5792 if (!nft_is_active(net, ext) || 5793 nft_set_elem_mark_busy(ext)) 5794 continue; 5795 5796 kfree(elem->priv); 5797 elem->priv = catchall->elem; 5798 nft_set_elem_change_active(net, set, ext); 5799 return 0; 5800 } 5801 5802 return -ENOENT; 5803 } 5804 5805 static int __nft_setelem_deactivate(const struct net *net, 5806 struct nft_set *set, 5807 struct nft_set_elem *elem) 5808 { 5809 void *priv; 5810 5811 priv = set->ops->deactivate(net, set, elem); 5812 if (!priv) 5813 return -ENOENT; 5814 5815 kfree(elem->priv); 5816 elem->priv = priv; 5817 set->ndeact++; 5818 5819 return 0; 5820 } 5821 5822 static int nft_setelem_deactivate(const struct net *net, 5823 struct nft_set *set, 5824 struct nft_set_elem *elem, u32 flags) 5825 { 5826 int ret; 5827 5828 if (flags & NFT_SET_ELEM_CATCHALL) 5829 ret = nft_setelem_catchall_deactivate(net, set, elem); 5830 else 5831 ret = __nft_setelem_deactivate(net, set, elem); 5832 5833 return ret; 5834 } 5835 5836 static void nft_setelem_catchall_remove(const struct net *net, 5837 const struct nft_set *set, 5838 const struct nft_set_elem *elem) 5839 { 5840 struct nft_set_elem_catchall *catchall, *next; 5841 5842 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { 5843 if (catchall->elem == elem->priv) { 5844 list_del_rcu(&catchall->list); 5845 kfree_rcu(catchall, rcu); 5846 break; 5847 } 5848 } 5849 } 5850 5851 static void nft_setelem_remove(const struct net *net, 5852 const struct nft_set *set, 5853 const struct nft_set_elem *elem) 5854 { 5855 if (nft_setelem_is_catchall(set, elem)) 5856 nft_setelem_catchall_remove(net, set, elem); 5857 else 5858 set->ops->remove(net, set, elem); 5859 } 5860 5861 static bool nft_setelem_valid_key_end(const struct nft_set *set, 5862 struct nlattr **nla, u32 flags) 5863 { 5864 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) == 5865 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) { 5866 if (flags & NFT_SET_ELEM_INTERVAL_END) 5867 return false; 5868 5869 if (nla[NFTA_SET_ELEM_KEY_END] && 5870 flags & NFT_SET_ELEM_CATCHALL) 5871 return false; 5872 } else { 5873 if (nla[NFTA_SET_ELEM_KEY_END]) 5874 return false; 5875 } 5876 5877 return true; 5878 } 5879 5880 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, 5881 const struct nlattr *attr, u32 nlmsg_flags) 5882 { 5883 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {}; 5884 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 5885 u8 genmask = nft_genmask_next(ctx->net); 5886 u32 flags = 0, size = 0, num_exprs = 0; 5887 struct nft_set_ext_tmpl tmpl; 5888 struct nft_set_ext *ext, *ext2; 5889 struct nft_set_elem elem; 5890 struct nft_set_binding *binding; 5891 struct nft_object *obj = NULL; 5892 struct nft_userdata *udata; 5893 struct nft_data_desc desc; 5894 enum nft_registers dreg; 5895 struct nft_trans *trans; 5896 u64 timeout; 5897 u64 expiration; 5898 int err, i; 5899 u8 ulen; 5900 5901 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 5902 nft_set_elem_policy, NULL); 5903 if (err < 0) 5904 return err; 5905 5906 nft_set_ext_prepare(&tmpl); 5907 5908 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 5909 if (err < 0) 5910 return err; 5911 5912 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 5913 return -EINVAL; 5914 5915 if (flags != 0) { 5916 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); 5917 if (err < 0) 5918 return err; 5919 } 5920 5921 if (set->flags & NFT_SET_MAP) { 5922 if (nla[NFTA_SET_ELEM_DATA] == NULL && 5923 !(flags & NFT_SET_ELEM_INTERVAL_END)) 5924 return -EINVAL; 5925 } else { 5926 if (nla[NFTA_SET_ELEM_DATA] != NULL) 5927 return -EINVAL; 5928 } 5929 5930 if (set->flags & NFT_SET_OBJECT) { 5931 if (!nla[NFTA_SET_ELEM_OBJREF] && 5932 !(flags & NFT_SET_ELEM_INTERVAL_END)) 5933 return -EINVAL; 5934 } else { 5935 if (nla[NFTA_SET_ELEM_OBJREF]) 5936 return -EINVAL; 5937 } 5938 5939 if (!nft_setelem_valid_key_end(set, nla, flags)) 5940 return -EINVAL; 5941 5942 if ((flags & NFT_SET_ELEM_INTERVAL_END) && 5943 (nla[NFTA_SET_ELEM_DATA] || 5944 nla[NFTA_SET_ELEM_OBJREF] || 5945 nla[NFTA_SET_ELEM_TIMEOUT] || 5946 nla[NFTA_SET_ELEM_EXPIRATION] || 5947 nla[NFTA_SET_ELEM_USERDATA] || 5948 nla[NFTA_SET_ELEM_EXPR] || 5949 nla[NFTA_SET_ELEM_KEY_END] || 5950 nla[NFTA_SET_ELEM_EXPRESSIONS])) 5951 return -EINVAL; 5952 5953 timeout = 0; 5954 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) { 5955 if (!(set->flags & NFT_SET_TIMEOUT)) 5956 return -EINVAL; 5957 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT], 5958 &timeout); 5959 if (err) 5960 return err; 5961 } else if (set->flags & NFT_SET_TIMEOUT && 5962 !(flags & NFT_SET_ELEM_INTERVAL_END)) { 5963 timeout = set->timeout; 5964 } 5965 5966 expiration = 0; 5967 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) { 5968 if (!(set->flags & NFT_SET_TIMEOUT)) 5969 return -EINVAL; 5970 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION], 5971 &expiration); 5972 if (err) 5973 return err; 5974 } 5975 5976 if (nla[NFTA_SET_ELEM_EXPR]) { 5977 struct nft_expr *expr; 5978 5979 if (set->num_exprs && set->num_exprs != 1) 5980 return -EOPNOTSUPP; 5981 5982 expr = nft_set_elem_expr_alloc(ctx, set, 5983 nla[NFTA_SET_ELEM_EXPR]); 5984 if (IS_ERR(expr)) 5985 return PTR_ERR(expr); 5986 5987 expr_array[0] = expr; 5988 num_exprs = 1; 5989 5990 if (set->num_exprs && set->exprs[0]->ops != expr->ops) { 5991 err = -EOPNOTSUPP; 5992 goto err_set_elem_expr; 5993 } 5994 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) { 5995 struct nft_expr *expr; 5996 struct nlattr *tmp; 5997 int left; 5998 5999 i = 0; 6000 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) { 6001 if (i == NFT_SET_EXPR_MAX || 6002 (set->num_exprs && set->num_exprs == i)) { 6003 err = -E2BIG; 6004 goto err_set_elem_expr; 6005 } 6006 if (nla_type(tmp) != NFTA_LIST_ELEM) { 6007 err = -EINVAL; 6008 goto err_set_elem_expr; 6009 } 6010 expr = nft_set_elem_expr_alloc(ctx, set, tmp); 6011 if (IS_ERR(expr)) { 6012 err = PTR_ERR(expr); 6013 goto err_set_elem_expr; 6014 } 6015 expr_array[i] = expr; 6016 num_exprs++; 6017 6018 if (set->num_exprs && expr->ops != set->exprs[i]->ops) { 6019 err = -EOPNOTSUPP; 6020 goto err_set_elem_expr; 6021 } 6022 i++; 6023 } 6024 if (set->num_exprs && set->num_exprs != i) { 6025 err = -EOPNOTSUPP; 6026 goto err_set_elem_expr; 6027 } 6028 } else if (set->num_exprs > 0 && 6029 !(flags & NFT_SET_ELEM_INTERVAL_END)) { 6030 err = nft_set_elem_expr_clone(ctx, set, expr_array); 6031 if (err < 0) 6032 goto err_set_elem_expr_clone; 6033 6034 num_exprs = set->num_exprs; 6035 } 6036 6037 if (nla[NFTA_SET_ELEM_KEY]) { 6038 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 6039 nla[NFTA_SET_ELEM_KEY]); 6040 if (err < 0) 6041 goto err_set_elem_expr; 6042 6043 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen); 6044 if (err < 0) 6045 goto err_parse_key; 6046 } 6047 6048 if (nla[NFTA_SET_ELEM_KEY_END]) { 6049 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 6050 nla[NFTA_SET_ELEM_KEY_END]); 6051 if (err < 0) 6052 goto err_parse_key; 6053 6054 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen); 6055 if (err < 0) 6056 goto err_parse_key_end; 6057 } 6058 6059 if (timeout > 0) { 6060 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION); 6061 if (err < 0) 6062 goto err_parse_key_end; 6063 6064 if (timeout != set->timeout) { 6065 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT); 6066 if (err < 0) 6067 goto err_parse_key_end; 6068 } 6069 } 6070 6071 if (num_exprs) { 6072 for (i = 0; i < num_exprs; i++) 6073 size += expr_array[i]->ops->size; 6074 6075 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS, 6076 sizeof(struct nft_set_elem_expr) + size); 6077 if (err < 0) 6078 goto err_parse_key_end; 6079 } 6080 6081 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) { 6082 obj = nft_obj_lookup(ctx->net, ctx->table, 6083 nla[NFTA_SET_ELEM_OBJREF], 6084 set->objtype, genmask); 6085 if (IS_ERR(obj)) { 6086 err = PTR_ERR(obj); 6087 goto err_parse_key_end; 6088 } 6089 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF); 6090 if (err < 0) 6091 goto err_parse_key_end; 6092 } 6093 6094 if (nla[NFTA_SET_ELEM_DATA] != NULL) { 6095 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val, 6096 nla[NFTA_SET_ELEM_DATA]); 6097 if (err < 0) 6098 goto err_parse_key_end; 6099 6100 dreg = nft_type_to_reg(set->dtype); 6101 list_for_each_entry(binding, &set->bindings, list) { 6102 struct nft_ctx bind_ctx = { 6103 .net = ctx->net, 6104 .family = ctx->family, 6105 .table = ctx->table, 6106 .chain = (struct nft_chain *)binding->chain, 6107 }; 6108 6109 if (!(binding->flags & NFT_SET_MAP)) 6110 continue; 6111 6112 err = nft_validate_register_store(&bind_ctx, dreg, 6113 &elem.data.val, 6114 desc.type, desc.len); 6115 if (err < 0) 6116 goto err_parse_data; 6117 6118 if (desc.type == NFT_DATA_VERDICT && 6119 (elem.data.val.verdict.code == NFT_GOTO || 6120 elem.data.val.verdict.code == NFT_JUMP)) 6121 nft_validate_state_update(ctx->net, 6122 NFT_VALIDATE_NEED); 6123 } 6124 6125 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len); 6126 if (err < 0) 6127 goto err_parse_data; 6128 } 6129 6130 /* The full maximum length of userdata can exceed the maximum 6131 * offset value (U8_MAX) for following extensions, therefor it 6132 * must be the last extension added. 6133 */ 6134 ulen = 0; 6135 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) { 6136 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]); 6137 if (ulen > 0) { 6138 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA, 6139 ulen); 6140 if (err < 0) 6141 goto err_parse_data; 6142 } 6143 } 6144 6145 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, 6146 elem.key_end.val.data, elem.data.val.data, 6147 timeout, expiration, GFP_KERNEL_ACCOUNT); 6148 if (IS_ERR(elem.priv)) { 6149 err = PTR_ERR(elem.priv); 6150 goto err_parse_data; 6151 } 6152 6153 ext = nft_set_elem_ext(set, elem.priv); 6154 if (flags) 6155 *nft_set_ext_flags(ext) = flags; 6156 6157 if (ulen > 0) { 6158 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) { 6159 err = -EINVAL; 6160 goto err_elem_userdata; 6161 } 6162 udata = nft_set_ext_userdata(ext); 6163 udata->len = ulen - 1; 6164 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen); 6165 } 6166 if (obj) { 6167 *nft_set_ext_obj(ext) = obj; 6168 obj->use++; 6169 } 6170 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs); 6171 if (err < 0) 6172 goto err_elem_free; 6173 6174 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set); 6175 if (trans == NULL) { 6176 err = -ENOMEM; 6177 goto err_elem_free; 6178 } 6179 6180 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK; 6181 6182 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags); 6183 if (err) { 6184 if (err == -EEXIST) { 6185 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^ 6186 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) || 6187 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^ 6188 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF)) 6189 goto err_element_clash; 6190 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) && 6191 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) && 6192 memcmp(nft_set_ext_data(ext), 6193 nft_set_ext_data(ext2), set->dlen) != 0) || 6194 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) && 6195 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) && 6196 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2))) 6197 goto err_element_clash; 6198 else if (!(nlmsg_flags & NLM_F_EXCL)) 6199 err = 0; 6200 } else if (err == -ENOTEMPTY) { 6201 /* ENOTEMPTY reports overlapping between this element 6202 * and an existing one. 6203 */ 6204 err = -EEXIST; 6205 } 6206 goto err_element_clash; 6207 } 6208 6209 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size && 6210 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) { 6211 err = -ENFILE; 6212 goto err_set_full; 6213 } 6214 6215 nft_trans_elem(trans) = elem; 6216 nft_trans_commit_list_add_tail(ctx->net, trans); 6217 return 0; 6218 6219 err_set_full: 6220 nft_setelem_remove(ctx->net, set, &elem); 6221 err_element_clash: 6222 kfree(trans); 6223 err_elem_free: 6224 if (obj) 6225 obj->use--; 6226 err_elem_userdata: 6227 nf_tables_set_elem_destroy(ctx, set, elem.priv); 6228 err_parse_data: 6229 if (nla[NFTA_SET_ELEM_DATA] != NULL) 6230 nft_data_release(&elem.data.val, desc.type); 6231 err_parse_key_end: 6232 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE); 6233 err_parse_key: 6234 nft_data_release(&elem.key.val, NFT_DATA_VALUE); 6235 err_set_elem_expr: 6236 for (i = 0; i < num_exprs && expr_array[i]; i++) 6237 nft_expr_destroy(ctx, expr_array[i]); 6238 err_set_elem_expr_clone: 6239 return err; 6240 } 6241 6242 static int nf_tables_newsetelem(struct sk_buff *skb, 6243 const struct nfnl_info *info, 6244 const struct nlattr * const nla[]) 6245 { 6246 struct nftables_pernet *nft_net = nft_pernet(info->net); 6247 struct netlink_ext_ack *extack = info->extack; 6248 u8 genmask = nft_genmask_next(info->net); 6249 u8 family = info->nfmsg->nfgen_family; 6250 struct net *net = info->net; 6251 const struct nlattr *attr; 6252 struct nft_table *table; 6253 struct nft_set *set; 6254 struct nft_ctx ctx; 6255 int rem, err; 6256 6257 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) 6258 return -EINVAL; 6259 6260 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 6261 genmask, NETLINK_CB(skb).portid); 6262 if (IS_ERR(table)) { 6263 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 6264 return PTR_ERR(table); 6265 } 6266 6267 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET], 6268 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask); 6269 if (IS_ERR(set)) 6270 return PTR_ERR(set); 6271 6272 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) 6273 return -EBUSY; 6274 6275 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6276 6277 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 6278 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags); 6279 if (err < 0) { 6280 NL_SET_BAD_ATTR(extack, attr); 6281 return err; 6282 } 6283 } 6284 6285 if (nft_net->validate_state == NFT_VALIDATE_DO) 6286 return nft_table_validate(net, table); 6287 6288 return 0; 6289 } 6290 6291 /** 6292 * nft_data_hold - hold a nft_data item 6293 * 6294 * @data: struct nft_data to release 6295 * @type: type of data 6296 * 6297 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded, 6298 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and 6299 * NFT_GOTO verdicts. This function must be called on active data objects 6300 * from the second phase of the commit protocol. 6301 */ 6302 void nft_data_hold(const struct nft_data *data, enum nft_data_types type) 6303 { 6304 struct nft_chain *chain; 6305 struct nft_rule *rule; 6306 6307 if (type == NFT_DATA_VERDICT) { 6308 switch (data->verdict.code) { 6309 case NFT_JUMP: 6310 case NFT_GOTO: 6311 chain = data->verdict.chain; 6312 chain->use++; 6313 6314 if (!nft_chain_is_bound(chain)) 6315 break; 6316 6317 chain->table->use++; 6318 list_for_each_entry(rule, &chain->rules, list) 6319 chain->use++; 6320 6321 nft_chain_add(chain->table, chain); 6322 break; 6323 } 6324 } 6325 } 6326 6327 static void nft_setelem_data_activate(const struct net *net, 6328 const struct nft_set *set, 6329 struct nft_set_elem *elem) 6330 { 6331 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 6332 6333 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 6334 nft_data_hold(nft_set_ext_data(ext), set->dtype); 6335 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 6336 (*nft_set_ext_obj(ext))->use++; 6337 } 6338 6339 static void nft_setelem_data_deactivate(const struct net *net, 6340 const struct nft_set *set, 6341 struct nft_set_elem *elem) 6342 { 6343 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 6344 6345 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA)) 6346 nft_data_release(nft_set_ext_data(ext), set->dtype); 6347 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF)) 6348 (*nft_set_ext_obj(ext))->use--; 6349 } 6350 6351 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, 6352 const struct nlattr *attr) 6353 { 6354 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1]; 6355 struct nft_set_ext_tmpl tmpl; 6356 struct nft_set_elem elem; 6357 struct nft_set_ext *ext; 6358 struct nft_trans *trans; 6359 u32 flags = 0; 6360 int err; 6361 6362 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr, 6363 nft_set_elem_policy, NULL); 6364 if (err < 0) 6365 return err; 6366 6367 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags); 6368 if (err < 0) 6369 return err; 6370 6371 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL)) 6372 return -EINVAL; 6373 6374 if (!nft_setelem_valid_key_end(set, nla, flags)) 6375 return -EINVAL; 6376 6377 nft_set_ext_prepare(&tmpl); 6378 6379 if (flags != 0) { 6380 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS); 6381 if (err < 0) 6382 return err; 6383 } 6384 6385 if (nla[NFTA_SET_ELEM_KEY]) { 6386 err = nft_setelem_parse_key(ctx, set, &elem.key.val, 6387 nla[NFTA_SET_ELEM_KEY]); 6388 if (err < 0) 6389 return err; 6390 6391 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen); 6392 if (err < 0) 6393 goto fail_elem; 6394 } 6395 6396 if (nla[NFTA_SET_ELEM_KEY_END]) { 6397 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val, 6398 nla[NFTA_SET_ELEM_KEY_END]); 6399 if (err < 0) 6400 goto fail_elem; 6401 6402 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen); 6403 if (err < 0) 6404 goto fail_elem_key_end; 6405 } 6406 6407 err = -ENOMEM; 6408 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data, 6409 elem.key_end.val.data, NULL, 0, 0, 6410 GFP_KERNEL_ACCOUNT); 6411 if (IS_ERR(elem.priv)) { 6412 err = PTR_ERR(elem.priv); 6413 goto fail_elem_key_end; 6414 } 6415 6416 ext = nft_set_elem_ext(set, elem.priv); 6417 if (flags) 6418 *nft_set_ext_flags(ext) = flags; 6419 6420 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set); 6421 if (trans == NULL) 6422 goto fail_trans; 6423 6424 err = nft_setelem_deactivate(ctx->net, set, &elem, flags); 6425 if (err < 0) 6426 goto fail_ops; 6427 6428 nft_setelem_data_deactivate(ctx->net, set, &elem); 6429 6430 nft_trans_elem(trans) = elem; 6431 nft_trans_commit_list_add_tail(ctx->net, trans); 6432 return 0; 6433 6434 fail_ops: 6435 kfree(trans); 6436 fail_trans: 6437 kfree(elem.priv); 6438 fail_elem_key_end: 6439 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE); 6440 fail_elem: 6441 nft_data_release(&elem.key.val, NFT_DATA_VALUE); 6442 return err; 6443 } 6444 6445 static int nft_setelem_flush(const struct nft_ctx *ctx, 6446 struct nft_set *set, 6447 const struct nft_set_iter *iter, 6448 struct nft_set_elem *elem) 6449 { 6450 struct nft_trans *trans; 6451 int err; 6452 6453 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, 6454 sizeof(struct nft_trans_elem), GFP_ATOMIC); 6455 if (!trans) 6456 return -ENOMEM; 6457 6458 if (!set->ops->flush(ctx->net, set, elem->priv)) { 6459 err = -ENOENT; 6460 goto err1; 6461 } 6462 set->ndeact++; 6463 6464 nft_setelem_data_deactivate(ctx->net, set, elem); 6465 nft_trans_elem_set(trans) = set; 6466 nft_trans_elem(trans) = *elem; 6467 nft_trans_commit_list_add_tail(ctx->net, trans); 6468 6469 return 0; 6470 err1: 6471 kfree(trans); 6472 return err; 6473 } 6474 6475 static int __nft_set_catchall_flush(const struct nft_ctx *ctx, 6476 struct nft_set *set, 6477 struct nft_set_elem *elem) 6478 { 6479 struct nft_trans *trans; 6480 6481 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, 6482 sizeof(struct nft_trans_elem), GFP_KERNEL); 6483 if (!trans) 6484 return -ENOMEM; 6485 6486 nft_setelem_data_deactivate(ctx->net, set, elem); 6487 nft_trans_elem_set(trans) = set; 6488 nft_trans_elem(trans) = *elem; 6489 nft_trans_commit_list_add_tail(ctx->net, trans); 6490 6491 return 0; 6492 } 6493 6494 static int nft_set_catchall_flush(const struct nft_ctx *ctx, 6495 struct nft_set *set) 6496 { 6497 u8 genmask = nft_genmask_next(ctx->net); 6498 struct nft_set_elem_catchall *catchall; 6499 struct nft_set_elem elem; 6500 struct nft_set_ext *ext; 6501 int ret = 0; 6502 6503 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 6504 ext = nft_set_elem_ext(set, catchall->elem); 6505 if (!nft_set_elem_active(ext, genmask) || 6506 nft_set_elem_mark_busy(ext)) 6507 continue; 6508 6509 elem.priv = catchall->elem; 6510 ret = __nft_set_catchall_flush(ctx, set, &elem); 6511 if (ret < 0) 6512 break; 6513 } 6514 6515 return ret; 6516 } 6517 6518 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask) 6519 { 6520 struct nft_set_iter iter = { 6521 .genmask = genmask, 6522 .fn = nft_setelem_flush, 6523 }; 6524 6525 set->ops->walk(ctx, set, &iter); 6526 if (!iter.err) 6527 iter.err = nft_set_catchall_flush(ctx, set); 6528 6529 return iter.err; 6530 } 6531 6532 static int nf_tables_delsetelem(struct sk_buff *skb, 6533 const struct nfnl_info *info, 6534 const struct nlattr * const nla[]) 6535 { 6536 struct netlink_ext_ack *extack = info->extack; 6537 u8 genmask = nft_genmask_next(info->net); 6538 u8 family = info->nfmsg->nfgen_family; 6539 struct net *net = info->net; 6540 const struct nlattr *attr; 6541 struct nft_table *table; 6542 struct nft_set *set; 6543 struct nft_ctx ctx; 6544 int rem, err = 0; 6545 6546 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family, 6547 genmask, NETLINK_CB(skb).portid); 6548 if (IS_ERR(table)) { 6549 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]); 6550 return PTR_ERR(table); 6551 } 6552 6553 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask); 6554 if (IS_ERR(set)) 6555 return PTR_ERR(set); 6556 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT) 6557 return -EBUSY; 6558 6559 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6560 6561 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS]) 6562 return nft_set_flush(&ctx, set, genmask); 6563 6564 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) { 6565 err = nft_del_setelem(&ctx, set, attr); 6566 if (err < 0) { 6567 NL_SET_BAD_ATTR(extack, attr); 6568 break; 6569 } 6570 } 6571 return err; 6572 } 6573 6574 void nft_set_gc_batch_release(struct rcu_head *rcu) 6575 { 6576 struct nft_set_gc_batch *gcb; 6577 unsigned int i; 6578 6579 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu); 6580 for (i = 0; i < gcb->head.cnt; i++) 6581 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true); 6582 kfree(gcb); 6583 } 6584 6585 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 6586 gfp_t gfp) 6587 { 6588 struct nft_set_gc_batch *gcb; 6589 6590 gcb = kzalloc(sizeof(*gcb), gfp); 6591 if (gcb == NULL) 6592 return gcb; 6593 gcb->head.set = set; 6594 return gcb; 6595 } 6596 6597 /* 6598 * Stateful objects 6599 */ 6600 6601 /** 6602 * nft_register_obj- register nf_tables stateful object type 6603 * @obj_type: object type 6604 * 6605 * Registers the object type for use with nf_tables. Returns zero on 6606 * success or a negative errno code otherwise. 6607 */ 6608 int nft_register_obj(struct nft_object_type *obj_type) 6609 { 6610 if (obj_type->type == NFT_OBJECT_UNSPEC) 6611 return -EINVAL; 6612 6613 nfnl_lock(NFNL_SUBSYS_NFTABLES); 6614 list_add_rcu(&obj_type->list, &nf_tables_objects); 6615 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 6616 return 0; 6617 } 6618 EXPORT_SYMBOL_GPL(nft_register_obj); 6619 6620 /** 6621 * nft_unregister_obj - unregister nf_tables object type 6622 * @obj_type: object type 6623 * 6624 * Unregisters the object type for use with nf_tables. 6625 */ 6626 void nft_unregister_obj(struct nft_object_type *obj_type) 6627 { 6628 nfnl_lock(NFNL_SUBSYS_NFTABLES); 6629 list_del_rcu(&obj_type->list); 6630 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 6631 } 6632 EXPORT_SYMBOL_GPL(nft_unregister_obj); 6633 6634 struct nft_object *nft_obj_lookup(const struct net *net, 6635 const struct nft_table *table, 6636 const struct nlattr *nla, u32 objtype, 6637 u8 genmask) 6638 { 6639 struct nft_object_hash_key k = { .table = table }; 6640 char search[NFT_OBJ_MAXNAMELEN]; 6641 struct rhlist_head *tmp, *list; 6642 struct nft_object *obj; 6643 6644 nla_strscpy(search, nla, sizeof(search)); 6645 k.name = search; 6646 6647 WARN_ON_ONCE(!rcu_read_lock_held() && 6648 !lockdep_commit_lock_is_held(net)); 6649 6650 rcu_read_lock(); 6651 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params); 6652 if (!list) 6653 goto out; 6654 6655 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) { 6656 if (objtype == obj->ops->type->type && 6657 nft_active_genmask(obj, genmask)) { 6658 rcu_read_unlock(); 6659 return obj; 6660 } 6661 } 6662 out: 6663 rcu_read_unlock(); 6664 return ERR_PTR(-ENOENT); 6665 } 6666 EXPORT_SYMBOL_GPL(nft_obj_lookup); 6667 6668 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table, 6669 const struct nlattr *nla, 6670 u32 objtype, u8 genmask) 6671 { 6672 struct nft_object *obj; 6673 6674 list_for_each_entry(obj, &table->objects, list) { 6675 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle && 6676 objtype == obj->ops->type->type && 6677 nft_active_genmask(obj, genmask)) 6678 return obj; 6679 } 6680 return ERR_PTR(-ENOENT); 6681 } 6682 6683 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = { 6684 [NFTA_OBJ_TABLE] = { .type = NLA_STRING, 6685 .len = NFT_TABLE_MAXNAMELEN - 1 }, 6686 [NFTA_OBJ_NAME] = { .type = NLA_STRING, 6687 .len = NFT_OBJ_MAXNAMELEN - 1 }, 6688 [NFTA_OBJ_TYPE] = { .type = NLA_U32 }, 6689 [NFTA_OBJ_DATA] = { .type = NLA_NESTED }, 6690 [NFTA_OBJ_HANDLE] = { .type = NLA_U64}, 6691 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY, 6692 .len = NFT_USERDATA_MAXLEN }, 6693 }; 6694 6695 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx, 6696 const struct nft_object_type *type, 6697 const struct nlattr *attr) 6698 { 6699 struct nlattr **tb; 6700 const struct nft_object_ops *ops; 6701 struct nft_object *obj; 6702 int err = -ENOMEM; 6703 6704 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL); 6705 if (!tb) 6706 goto err1; 6707 6708 if (attr) { 6709 err = nla_parse_nested_deprecated(tb, type->maxattr, attr, 6710 type->policy, NULL); 6711 if (err < 0) 6712 goto err2; 6713 } else { 6714 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1)); 6715 } 6716 6717 if (type->select_ops) { 6718 ops = type->select_ops(ctx, (const struct nlattr * const *)tb); 6719 if (IS_ERR(ops)) { 6720 err = PTR_ERR(ops); 6721 goto err2; 6722 } 6723 } else { 6724 ops = type->ops; 6725 } 6726 6727 err = -ENOMEM; 6728 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT); 6729 if (!obj) 6730 goto err2; 6731 6732 err = ops->init(ctx, (const struct nlattr * const *)tb, obj); 6733 if (err < 0) 6734 goto err3; 6735 6736 obj->ops = ops; 6737 6738 kfree(tb); 6739 return obj; 6740 err3: 6741 kfree(obj); 6742 err2: 6743 kfree(tb); 6744 err1: 6745 return ERR_PTR(err); 6746 } 6747 6748 static int nft_object_dump(struct sk_buff *skb, unsigned int attr, 6749 struct nft_object *obj, bool reset) 6750 { 6751 struct nlattr *nest; 6752 6753 nest = nla_nest_start_noflag(skb, attr); 6754 if (!nest) 6755 goto nla_put_failure; 6756 if (obj->ops->dump(skb, obj, reset) < 0) 6757 goto nla_put_failure; 6758 nla_nest_end(skb, nest); 6759 return 0; 6760 6761 nla_put_failure: 6762 return -1; 6763 } 6764 6765 static const struct nft_object_type *__nft_obj_type_get(u32 objtype) 6766 { 6767 const struct nft_object_type *type; 6768 6769 list_for_each_entry(type, &nf_tables_objects, list) { 6770 if (objtype == type->type) 6771 return type; 6772 } 6773 return NULL; 6774 } 6775 6776 static const struct nft_object_type * 6777 nft_obj_type_get(struct net *net, u32 objtype) 6778 { 6779 const struct nft_object_type *type; 6780 6781 type = __nft_obj_type_get(objtype); 6782 if (type != NULL && try_module_get(type->owner)) 6783 return type; 6784 6785 lockdep_nfnl_nft_mutex_not_held(); 6786 #ifdef CONFIG_MODULES 6787 if (type == NULL) { 6788 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN) 6789 return ERR_PTR(-EAGAIN); 6790 } 6791 #endif 6792 return ERR_PTR(-ENOENT); 6793 } 6794 6795 static int nf_tables_updobj(const struct nft_ctx *ctx, 6796 const struct nft_object_type *type, 6797 const struct nlattr *attr, 6798 struct nft_object *obj) 6799 { 6800 struct nft_object *newobj; 6801 struct nft_trans *trans; 6802 int err = -ENOMEM; 6803 6804 if (!try_module_get(type->owner)) 6805 return -ENOENT; 6806 6807 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ, 6808 sizeof(struct nft_trans_obj)); 6809 if (!trans) 6810 goto err_trans; 6811 6812 newobj = nft_obj_init(ctx, type, attr); 6813 if (IS_ERR(newobj)) { 6814 err = PTR_ERR(newobj); 6815 goto err_free_trans; 6816 } 6817 6818 nft_trans_obj(trans) = obj; 6819 nft_trans_obj_update(trans) = true; 6820 nft_trans_obj_newobj(trans) = newobj; 6821 nft_trans_commit_list_add_tail(ctx->net, trans); 6822 6823 return 0; 6824 6825 err_free_trans: 6826 kfree(trans); 6827 err_trans: 6828 module_put(type->owner); 6829 return err; 6830 } 6831 6832 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info, 6833 const struct nlattr * const nla[]) 6834 { 6835 struct netlink_ext_ack *extack = info->extack; 6836 u8 genmask = nft_genmask_next(info->net); 6837 u8 family = info->nfmsg->nfgen_family; 6838 const struct nft_object_type *type; 6839 struct net *net = info->net; 6840 struct nft_table *table; 6841 struct nft_object *obj; 6842 struct nft_ctx ctx; 6843 u32 objtype; 6844 int err; 6845 6846 if (!nla[NFTA_OBJ_TYPE] || 6847 !nla[NFTA_OBJ_NAME] || 6848 !nla[NFTA_OBJ_DATA]) 6849 return -EINVAL; 6850 6851 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 6852 NETLINK_CB(skb).portid); 6853 if (IS_ERR(table)) { 6854 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 6855 return PTR_ERR(table); 6856 } 6857 6858 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 6859 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask); 6860 if (IS_ERR(obj)) { 6861 err = PTR_ERR(obj); 6862 if (err != -ENOENT) { 6863 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6864 return err; 6865 } 6866 } else { 6867 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 6868 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 6869 return -EEXIST; 6870 } 6871 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) 6872 return -EOPNOTSUPP; 6873 6874 type = __nft_obj_type_get(objtype); 6875 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6876 6877 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj); 6878 } 6879 6880 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 6881 6882 type = nft_obj_type_get(net, objtype); 6883 if (IS_ERR(type)) 6884 return PTR_ERR(type); 6885 6886 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]); 6887 if (IS_ERR(obj)) { 6888 err = PTR_ERR(obj); 6889 goto err_init; 6890 } 6891 obj->key.table = table; 6892 obj->handle = nf_tables_alloc_handle(table); 6893 6894 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT); 6895 if (!obj->key.name) { 6896 err = -ENOMEM; 6897 goto err_strdup; 6898 } 6899 6900 if (nla[NFTA_OBJ_USERDATA]) { 6901 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL); 6902 if (obj->udata == NULL) 6903 goto err_userdata; 6904 6905 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]); 6906 } 6907 6908 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj); 6909 if (err < 0) 6910 goto err_trans; 6911 6912 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead, 6913 nft_objname_ht_params); 6914 if (err < 0) 6915 goto err_obj_ht; 6916 6917 list_add_tail_rcu(&obj->list, &table->objects); 6918 table->use++; 6919 return 0; 6920 err_obj_ht: 6921 /* queued in transaction log */ 6922 INIT_LIST_HEAD(&obj->list); 6923 return err; 6924 err_trans: 6925 kfree(obj->udata); 6926 err_userdata: 6927 kfree(obj->key.name); 6928 err_strdup: 6929 if (obj->ops->destroy) 6930 obj->ops->destroy(&ctx, obj); 6931 kfree(obj); 6932 err_init: 6933 module_put(type->owner); 6934 return err; 6935 } 6936 6937 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net, 6938 u32 portid, u32 seq, int event, u32 flags, 6939 int family, const struct nft_table *table, 6940 struct nft_object *obj, bool reset) 6941 { 6942 struct nlmsghdr *nlh; 6943 6944 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 6945 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 6946 NFNETLINK_V0, nft_base_seq(net)); 6947 if (!nlh) 6948 goto nla_put_failure; 6949 6950 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) || 6951 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) || 6952 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) || 6953 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) || 6954 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) || 6955 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle), 6956 NFTA_OBJ_PAD)) 6957 goto nla_put_failure; 6958 6959 if (obj->udata && 6960 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata)) 6961 goto nla_put_failure; 6962 6963 nlmsg_end(skb, nlh); 6964 return 0; 6965 6966 nla_put_failure: 6967 nlmsg_trim(skb, nlh); 6968 return -1; 6969 } 6970 6971 struct nft_obj_filter { 6972 char *table; 6973 u32 type; 6974 }; 6975 6976 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb) 6977 { 6978 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 6979 const struct nft_table *table; 6980 unsigned int idx = 0, s_idx = cb->args[0]; 6981 struct nft_obj_filter *filter = cb->data; 6982 struct net *net = sock_net(skb->sk); 6983 int family = nfmsg->nfgen_family; 6984 struct nftables_pernet *nft_net; 6985 struct nft_object *obj; 6986 bool reset = false; 6987 6988 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) 6989 reset = true; 6990 6991 rcu_read_lock(); 6992 nft_net = nft_pernet(net); 6993 cb->seq = READ_ONCE(nft_net->base_seq); 6994 6995 list_for_each_entry_rcu(table, &nft_net->tables, list) { 6996 if (family != NFPROTO_UNSPEC && family != table->family) 6997 continue; 6998 6999 list_for_each_entry_rcu(obj, &table->objects, list) { 7000 if (!nft_is_active(net, obj)) 7001 goto cont; 7002 if (idx < s_idx) 7003 goto cont; 7004 if (idx > s_idx) 7005 memset(&cb->args[1], 0, 7006 sizeof(cb->args) - sizeof(cb->args[0])); 7007 if (filter && filter->table && 7008 strcmp(filter->table, table->name)) 7009 goto cont; 7010 if (filter && 7011 filter->type != NFT_OBJECT_UNSPEC && 7012 obj->ops->type->type != filter->type) 7013 goto cont; 7014 if (reset) { 7015 char *buf = kasprintf(GFP_ATOMIC, 7016 "%s:%u", 7017 table->name, 7018 nft_net->base_seq); 7019 7020 audit_log_nfcfg(buf, 7021 family, 7022 obj->handle, 7023 AUDIT_NFT_OP_OBJ_RESET, 7024 GFP_ATOMIC); 7025 kfree(buf); 7026 } 7027 7028 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid, 7029 cb->nlh->nlmsg_seq, 7030 NFT_MSG_NEWOBJ, 7031 NLM_F_MULTI | NLM_F_APPEND, 7032 table->family, table, 7033 obj, reset) < 0) 7034 goto done; 7035 7036 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 7037 cont: 7038 idx++; 7039 } 7040 } 7041 done: 7042 rcu_read_unlock(); 7043 7044 cb->args[0] = idx; 7045 return skb->len; 7046 } 7047 7048 static int nf_tables_dump_obj_start(struct netlink_callback *cb) 7049 { 7050 const struct nlattr * const *nla = cb->data; 7051 struct nft_obj_filter *filter = NULL; 7052 7053 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) { 7054 filter = kzalloc(sizeof(*filter), GFP_ATOMIC); 7055 if (!filter) 7056 return -ENOMEM; 7057 7058 if (nla[NFTA_OBJ_TABLE]) { 7059 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC); 7060 if (!filter->table) { 7061 kfree(filter); 7062 return -ENOMEM; 7063 } 7064 } 7065 7066 if (nla[NFTA_OBJ_TYPE]) 7067 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 7068 } 7069 7070 cb->data = filter; 7071 return 0; 7072 } 7073 7074 static int nf_tables_dump_obj_done(struct netlink_callback *cb) 7075 { 7076 struct nft_obj_filter *filter = cb->data; 7077 7078 if (filter) { 7079 kfree(filter->table); 7080 kfree(filter); 7081 } 7082 7083 return 0; 7084 } 7085 7086 /* called with rcu_read_lock held */ 7087 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info, 7088 const struct nlattr * const nla[]) 7089 { 7090 struct netlink_ext_ack *extack = info->extack; 7091 u8 genmask = nft_genmask_cur(info->net); 7092 u8 family = info->nfmsg->nfgen_family; 7093 const struct nft_table *table; 7094 struct net *net = info->net; 7095 struct nft_object *obj; 7096 struct sk_buff *skb2; 7097 bool reset = false; 7098 u32 objtype; 7099 int err; 7100 7101 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 7102 struct netlink_dump_control c = { 7103 .start = nf_tables_dump_obj_start, 7104 .dump = nf_tables_dump_obj, 7105 .done = nf_tables_dump_obj_done, 7106 .module = THIS_MODULE, 7107 .data = (void *)nla, 7108 }; 7109 7110 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 7111 } 7112 7113 if (!nla[NFTA_OBJ_NAME] || 7114 !nla[NFTA_OBJ_TYPE]) 7115 return -EINVAL; 7116 7117 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0); 7118 if (IS_ERR(table)) { 7119 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 7120 return PTR_ERR(table); 7121 } 7122 7123 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 7124 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask); 7125 if (IS_ERR(obj)) { 7126 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]); 7127 return PTR_ERR(obj); 7128 } 7129 7130 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 7131 if (!skb2) 7132 return -ENOMEM; 7133 7134 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET) 7135 reset = true; 7136 7137 if (reset) { 7138 const struct nftables_pernet *nft_net; 7139 char *buf; 7140 7141 nft_net = nft_pernet(net); 7142 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq); 7143 7144 audit_log_nfcfg(buf, 7145 family, 7146 obj->handle, 7147 AUDIT_NFT_OP_OBJ_RESET, 7148 GFP_ATOMIC); 7149 kfree(buf); 7150 } 7151 7152 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid, 7153 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0, 7154 family, table, obj, reset); 7155 if (err < 0) 7156 goto err_fill_obj_info; 7157 7158 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 7159 7160 err_fill_obj_info: 7161 kfree_skb(skb2); 7162 return err; 7163 } 7164 7165 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj) 7166 { 7167 if (obj->ops->destroy) 7168 obj->ops->destroy(ctx, obj); 7169 7170 module_put(obj->ops->type->owner); 7171 kfree(obj->key.name); 7172 kfree(obj->udata); 7173 kfree(obj); 7174 } 7175 7176 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info, 7177 const struct nlattr * const nla[]) 7178 { 7179 struct netlink_ext_ack *extack = info->extack; 7180 u8 genmask = nft_genmask_next(info->net); 7181 u8 family = info->nfmsg->nfgen_family; 7182 struct net *net = info->net; 7183 const struct nlattr *attr; 7184 struct nft_table *table; 7185 struct nft_object *obj; 7186 struct nft_ctx ctx; 7187 u32 objtype; 7188 7189 if (!nla[NFTA_OBJ_TYPE] || 7190 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE])) 7191 return -EINVAL; 7192 7193 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 7194 NETLINK_CB(skb).portid); 7195 if (IS_ERR(table)) { 7196 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]); 7197 return PTR_ERR(table); 7198 } 7199 7200 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE])); 7201 if (nla[NFTA_OBJ_HANDLE]) { 7202 attr = nla[NFTA_OBJ_HANDLE]; 7203 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask); 7204 } else { 7205 attr = nla[NFTA_OBJ_NAME]; 7206 obj = nft_obj_lookup(net, table, attr, objtype, genmask); 7207 } 7208 7209 if (IS_ERR(obj)) { 7210 NL_SET_BAD_ATTR(extack, attr); 7211 return PTR_ERR(obj); 7212 } 7213 if (obj->use > 0) { 7214 NL_SET_BAD_ATTR(extack, attr); 7215 return -EBUSY; 7216 } 7217 7218 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7219 7220 return nft_delobj(&ctx, obj); 7221 } 7222 7223 void nft_obj_notify(struct net *net, const struct nft_table *table, 7224 struct nft_object *obj, u32 portid, u32 seq, int event, 7225 u16 flags, int family, int report, gfp_t gfp) 7226 { 7227 struct nftables_pernet *nft_net = nft_pernet(net); 7228 struct sk_buff *skb; 7229 int err; 7230 char *buf = kasprintf(gfp, "%s:%u", 7231 table->name, nft_net->base_seq); 7232 7233 audit_log_nfcfg(buf, 7234 family, 7235 obj->handle, 7236 event == NFT_MSG_NEWOBJ ? 7237 AUDIT_NFT_OP_OBJ_REGISTER : 7238 AUDIT_NFT_OP_OBJ_UNREGISTER, 7239 gfp); 7240 kfree(buf); 7241 7242 if (!report && 7243 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 7244 return; 7245 7246 skb = nlmsg_new(NLMSG_GOODSIZE, gfp); 7247 if (skb == NULL) 7248 goto err; 7249 7250 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 7251 flags & (NLM_F_CREATE | NLM_F_EXCL), 7252 family, table, obj, false); 7253 if (err < 0) { 7254 kfree_skb(skb); 7255 goto err; 7256 } 7257 7258 nft_notify_enqueue(skb, report, &nft_net->notify_list); 7259 return; 7260 err: 7261 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS); 7262 } 7263 EXPORT_SYMBOL_GPL(nft_obj_notify); 7264 7265 static void nf_tables_obj_notify(const struct nft_ctx *ctx, 7266 struct nft_object *obj, int event) 7267 { 7268 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event, 7269 ctx->flags, ctx->family, ctx->report, GFP_KERNEL); 7270 } 7271 7272 /* 7273 * Flow tables 7274 */ 7275 void nft_register_flowtable_type(struct nf_flowtable_type *type) 7276 { 7277 nfnl_lock(NFNL_SUBSYS_NFTABLES); 7278 list_add_tail_rcu(&type->list, &nf_tables_flowtables); 7279 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 7280 } 7281 EXPORT_SYMBOL_GPL(nft_register_flowtable_type); 7282 7283 void nft_unregister_flowtable_type(struct nf_flowtable_type *type) 7284 { 7285 nfnl_lock(NFNL_SUBSYS_NFTABLES); 7286 list_del_rcu(&type->list); 7287 nfnl_unlock(NFNL_SUBSYS_NFTABLES); 7288 } 7289 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type); 7290 7291 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = { 7292 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING, 7293 .len = NFT_NAME_MAXLEN - 1 }, 7294 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING, 7295 .len = NFT_NAME_MAXLEN - 1 }, 7296 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED }, 7297 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 }, 7298 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 }, 7299 }; 7300 7301 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 7302 const struct nlattr *nla, u8 genmask) 7303 { 7304 struct nft_flowtable *flowtable; 7305 7306 list_for_each_entry_rcu(flowtable, &table->flowtables, list) { 7307 if (!nla_strcmp(nla, flowtable->name) && 7308 nft_active_genmask(flowtable, genmask)) 7309 return flowtable; 7310 } 7311 return ERR_PTR(-ENOENT); 7312 } 7313 EXPORT_SYMBOL_GPL(nft_flowtable_lookup); 7314 7315 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 7316 struct nft_flowtable *flowtable, 7317 enum nft_trans_phase phase) 7318 { 7319 switch (phase) { 7320 case NFT_TRANS_PREPARE: 7321 case NFT_TRANS_ABORT: 7322 case NFT_TRANS_RELEASE: 7323 flowtable->use--; 7324 fallthrough; 7325 default: 7326 return; 7327 } 7328 } 7329 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable); 7330 7331 static struct nft_flowtable * 7332 nft_flowtable_lookup_byhandle(const struct nft_table *table, 7333 const struct nlattr *nla, u8 genmask) 7334 { 7335 struct nft_flowtable *flowtable; 7336 7337 list_for_each_entry(flowtable, &table->flowtables, list) { 7338 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle && 7339 nft_active_genmask(flowtable, genmask)) 7340 return flowtable; 7341 } 7342 return ERR_PTR(-ENOENT); 7343 } 7344 7345 struct nft_flowtable_hook { 7346 u32 num; 7347 int priority; 7348 struct list_head list; 7349 }; 7350 7351 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = { 7352 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 }, 7353 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 }, 7354 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED }, 7355 }; 7356 7357 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx, 7358 const struct nlattr *attr, 7359 struct nft_flowtable_hook *flowtable_hook, 7360 struct nft_flowtable *flowtable, bool add) 7361 { 7362 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1]; 7363 struct nft_hook *hook; 7364 int hooknum, priority; 7365 int err; 7366 7367 INIT_LIST_HEAD(&flowtable_hook->list); 7368 7369 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr, 7370 nft_flowtable_hook_policy, NULL); 7371 if (err < 0) 7372 return err; 7373 7374 if (add) { 7375 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] || 7376 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) 7377 return -EINVAL; 7378 7379 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); 7380 if (hooknum != NF_NETDEV_INGRESS) 7381 return -EOPNOTSUPP; 7382 7383 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); 7384 7385 flowtable_hook->priority = priority; 7386 flowtable_hook->num = hooknum; 7387 } else { 7388 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) { 7389 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM])); 7390 if (hooknum != flowtable->hooknum) 7391 return -EOPNOTSUPP; 7392 } 7393 7394 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) { 7395 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY])); 7396 if (priority != flowtable->data.priority) 7397 return -EOPNOTSUPP; 7398 } 7399 7400 flowtable_hook->priority = flowtable->data.priority; 7401 flowtable_hook->num = flowtable->hooknum; 7402 } 7403 7404 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) { 7405 err = nf_tables_parse_netdev_hooks(ctx->net, 7406 tb[NFTA_FLOWTABLE_HOOK_DEVS], 7407 &flowtable_hook->list); 7408 if (err < 0) 7409 return err; 7410 } 7411 7412 list_for_each_entry(hook, &flowtable_hook->list, list) { 7413 hook->ops.pf = NFPROTO_NETDEV; 7414 hook->ops.hooknum = flowtable_hook->num; 7415 hook->ops.priority = flowtable_hook->priority; 7416 hook->ops.priv = &flowtable->data; 7417 hook->ops.hook = flowtable->data.type->hook; 7418 } 7419 7420 return err; 7421 } 7422 7423 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family) 7424 { 7425 const struct nf_flowtable_type *type; 7426 7427 list_for_each_entry(type, &nf_tables_flowtables, list) { 7428 if (family == type->family) 7429 return type; 7430 } 7431 return NULL; 7432 } 7433 7434 static const struct nf_flowtable_type * 7435 nft_flowtable_type_get(struct net *net, u8 family) 7436 { 7437 const struct nf_flowtable_type *type; 7438 7439 type = __nft_flowtable_type_get(family); 7440 if (type != NULL && try_module_get(type->owner)) 7441 return type; 7442 7443 lockdep_nfnl_nft_mutex_not_held(); 7444 #ifdef CONFIG_MODULES 7445 if (type == NULL) { 7446 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN) 7447 return ERR_PTR(-EAGAIN); 7448 } 7449 #endif 7450 return ERR_PTR(-ENOENT); 7451 } 7452 7453 /* Only called from error and netdev event paths. */ 7454 static void nft_unregister_flowtable_hook(struct net *net, 7455 struct nft_flowtable *flowtable, 7456 struct nft_hook *hook) 7457 { 7458 nf_unregister_net_hook(net, &hook->ops); 7459 flowtable->data.type->setup(&flowtable->data, hook->ops.dev, 7460 FLOW_BLOCK_UNBIND); 7461 } 7462 7463 static void __nft_unregister_flowtable_net_hooks(struct net *net, 7464 struct list_head *hook_list, 7465 bool release_netdev) 7466 { 7467 struct nft_hook *hook, *next; 7468 7469 list_for_each_entry_safe(hook, next, hook_list, list) { 7470 nf_unregister_net_hook(net, &hook->ops); 7471 if (release_netdev) { 7472 list_del(&hook->list); 7473 kfree_rcu(hook, rcu); 7474 } 7475 } 7476 } 7477 7478 static void nft_unregister_flowtable_net_hooks(struct net *net, 7479 struct list_head *hook_list) 7480 { 7481 __nft_unregister_flowtable_net_hooks(net, hook_list, false); 7482 } 7483 7484 static int nft_register_flowtable_net_hooks(struct net *net, 7485 struct nft_table *table, 7486 struct list_head *hook_list, 7487 struct nft_flowtable *flowtable) 7488 { 7489 struct nft_hook *hook, *hook2, *next; 7490 struct nft_flowtable *ft; 7491 int err, i = 0; 7492 7493 list_for_each_entry(hook, hook_list, list) { 7494 list_for_each_entry(ft, &table->flowtables, list) { 7495 if (!nft_is_active_next(net, ft)) 7496 continue; 7497 7498 list_for_each_entry(hook2, &ft->hook_list, list) { 7499 if (hook->ops.dev == hook2->ops.dev && 7500 hook->ops.pf == hook2->ops.pf) { 7501 err = -EEXIST; 7502 goto err_unregister_net_hooks; 7503 } 7504 } 7505 } 7506 7507 err = flowtable->data.type->setup(&flowtable->data, 7508 hook->ops.dev, 7509 FLOW_BLOCK_BIND); 7510 if (err < 0) 7511 goto err_unregister_net_hooks; 7512 7513 err = nf_register_net_hook(net, &hook->ops); 7514 if (err < 0) { 7515 flowtable->data.type->setup(&flowtable->data, 7516 hook->ops.dev, 7517 FLOW_BLOCK_UNBIND); 7518 goto err_unregister_net_hooks; 7519 } 7520 7521 i++; 7522 } 7523 7524 return 0; 7525 7526 err_unregister_net_hooks: 7527 list_for_each_entry_safe(hook, next, hook_list, list) { 7528 if (i-- <= 0) 7529 break; 7530 7531 nft_unregister_flowtable_hook(net, flowtable, hook); 7532 list_del_rcu(&hook->list); 7533 kfree_rcu(hook, rcu); 7534 } 7535 7536 return err; 7537 } 7538 7539 static void nft_flowtable_hooks_destroy(struct list_head *hook_list) 7540 { 7541 struct nft_hook *hook, *next; 7542 7543 list_for_each_entry_safe(hook, next, hook_list, list) { 7544 list_del_rcu(&hook->list); 7545 kfree_rcu(hook, rcu); 7546 } 7547 } 7548 7549 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh, 7550 struct nft_flowtable *flowtable) 7551 { 7552 const struct nlattr * const *nla = ctx->nla; 7553 struct nft_flowtable_hook flowtable_hook; 7554 struct nft_hook *hook, *next; 7555 struct nft_trans *trans; 7556 bool unregister = false; 7557 u32 flags; 7558 int err; 7559 7560 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK], 7561 &flowtable_hook, flowtable, false); 7562 if (err < 0) 7563 return err; 7564 7565 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) { 7566 if (nft_hook_list_find(&flowtable->hook_list, hook)) { 7567 list_del(&hook->list); 7568 kfree(hook); 7569 } 7570 } 7571 7572 if (nla[NFTA_FLOWTABLE_FLAGS]) { 7573 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS])); 7574 if (flags & ~NFT_FLOWTABLE_MASK) { 7575 err = -EOPNOTSUPP; 7576 goto err_flowtable_update_hook; 7577 } 7578 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^ 7579 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) { 7580 err = -EOPNOTSUPP; 7581 goto err_flowtable_update_hook; 7582 } 7583 } else { 7584 flags = flowtable->data.flags; 7585 } 7586 7587 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table, 7588 &flowtable_hook.list, flowtable); 7589 if (err < 0) 7590 goto err_flowtable_update_hook; 7591 7592 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE, 7593 sizeof(struct nft_trans_flowtable)); 7594 if (!trans) { 7595 unregister = true; 7596 err = -ENOMEM; 7597 goto err_flowtable_update_hook; 7598 } 7599 7600 nft_trans_flowtable_flags(trans) = flags; 7601 nft_trans_flowtable(trans) = flowtable; 7602 nft_trans_flowtable_update(trans) = true; 7603 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 7604 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans)); 7605 7606 nft_trans_commit_list_add_tail(ctx->net, trans); 7607 7608 return 0; 7609 7610 err_flowtable_update_hook: 7611 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) { 7612 if (unregister) 7613 nft_unregister_flowtable_hook(ctx->net, flowtable, hook); 7614 list_del_rcu(&hook->list); 7615 kfree_rcu(hook, rcu); 7616 } 7617 7618 return err; 7619 7620 } 7621 7622 static int nf_tables_newflowtable(struct sk_buff *skb, 7623 const struct nfnl_info *info, 7624 const struct nlattr * const nla[]) 7625 { 7626 struct netlink_ext_ack *extack = info->extack; 7627 struct nft_flowtable_hook flowtable_hook; 7628 u8 genmask = nft_genmask_next(info->net); 7629 u8 family = info->nfmsg->nfgen_family; 7630 const struct nf_flowtable_type *type; 7631 struct nft_flowtable *flowtable; 7632 struct nft_hook *hook, *next; 7633 struct net *net = info->net; 7634 struct nft_table *table; 7635 struct nft_ctx ctx; 7636 int err; 7637 7638 if (!nla[NFTA_FLOWTABLE_TABLE] || 7639 !nla[NFTA_FLOWTABLE_NAME] || 7640 !nla[NFTA_FLOWTABLE_HOOK]) 7641 return -EINVAL; 7642 7643 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7644 genmask, NETLINK_CB(skb).portid); 7645 if (IS_ERR(table)) { 7646 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); 7647 return PTR_ERR(table); 7648 } 7649 7650 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], 7651 genmask); 7652 if (IS_ERR(flowtable)) { 7653 err = PTR_ERR(flowtable); 7654 if (err != -ENOENT) { 7655 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); 7656 return err; 7657 } 7658 } else { 7659 if (info->nlh->nlmsg_flags & NLM_F_EXCL) { 7660 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]); 7661 return -EEXIST; 7662 } 7663 7664 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7665 7666 return nft_flowtable_update(&ctx, info->nlh, flowtable); 7667 } 7668 7669 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7670 7671 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT); 7672 if (!flowtable) 7673 return -ENOMEM; 7674 7675 flowtable->table = table; 7676 flowtable->handle = nf_tables_alloc_handle(table); 7677 INIT_LIST_HEAD(&flowtable->hook_list); 7678 7679 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT); 7680 if (!flowtable->name) { 7681 err = -ENOMEM; 7682 goto err1; 7683 } 7684 7685 type = nft_flowtable_type_get(net, family); 7686 if (IS_ERR(type)) { 7687 err = PTR_ERR(type); 7688 goto err2; 7689 } 7690 7691 if (nla[NFTA_FLOWTABLE_FLAGS]) { 7692 flowtable->data.flags = 7693 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS])); 7694 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) { 7695 err = -EOPNOTSUPP; 7696 goto err3; 7697 } 7698 } 7699 7700 write_pnet(&flowtable->data.net, net); 7701 flowtable->data.type = type; 7702 err = type->init(&flowtable->data); 7703 if (err < 0) 7704 goto err3; 7705 7706 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK], 7707 &flowtable_hook, flowtable, true); 7708 if (err < 0) 7709 goto err4; 7710 7711 list_splice(&flowtable_hook.list, &flowtable->hook_list); 7712 flowtable->data.priority = flowtable_hook.priority; 7713 flowtable->hooknum = flowtable_hook.num; 7714 7715 err = nft_register_flowtable_net_hooks(ctx.net, table, 7716 &flowtable->hook_list, 7717 flowtable); 7718 if (err < 0) { 7719 nft_flowtable_hooks_destroy(&flowtable->hook_list); 7720 goto err4; 7721 } 7722 7723 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable); 7724 if (err < 0) 7725 goto err5; 7726 7727 list_add_tail_rcu(&flowtable->list, &table->flowtables); 7728 table->use++; 7729 7730 return 0; 7731 err5: 7732 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 7733 nft_unregister_flowtable_hook(net, flowtable, hook); 7734 list_del_rcu(&hook->list); 7735 kfree_rcu(hook, rcu); 7736 } 7737 err4: 7738 flowtable->data.type->free(&flowtable->data); 7739 err3: 7740 module_put(type->owner); 7741 err2: 7742 kfree(flowtable->name); 7743 err1: 7744 kfree(flowtable); 7745 return err; 7746 } 7747 7748 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook) 7749 { 7750 struct nft_hook *this, *next; 7751 7752 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) { 7753 list_del(&this->list); 7754 kfree(this); 7755 } 7756 } 7757 7758 static int nft_delflowtable_hook(struct nft_ctx *ctx, 7759 struct nft_flowtable *flowtable) 7760 { 7761 const struct nlattr * const *nla = ctx->nla; 7762 struct nft_flowtable_hook flowtable_hook; 7763 LIST_HEAD(flowtable_del_list); 7764 struct nft_hook *this, *hook; 7765 struct nft_trans *trans; 7766 int err; 7767 7768 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK], 7769 &flowtable_hook, flowtable, false); 7770 if (err < 0) 7771 return err; 7772 7773 list_for_each_entry(this, &flowtable_hook.list, list) { 7774 hook = nft_hook_list_find(&flowtable->hook_list, this); 7775 if (!hook) { 7776 err = -ENOENT; 7777 goto err_flowtable_del_hook; 7778 } 7779 list_move(&hook->list, &flowtable_del_list); 7780 } 7781 7782 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE, 7783 sizeof(struct nft_trans_flowtable)); 7784 if (!trans) { 7785 err = -ENOMEM; 7786 goto err_flowtable_del_hook; 7787 } 7788 7789 nft_trans_flowtable(trans) = flowtable; 7790 nft_trans_flowtable_update(trans) = true; 7791 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans)); 7792 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans)); 7793 nft_flowtable_hook_release(&flowtable_hook); 7794 7795 nft_trans_commit_list_add_tail(ctx->net, trans); 7796 7797 return 0; 7798 7799 err_flowtable_del_hook: 7800 list_splice(&flowtable_del_list, &flowtable->hook_list); 7801 nft_flowtable_hook_release(&flowtable_hook); 7802 7803 return err; 7804 } 7805 7806 static int nf_tables_delflowtable(struct sk_buff *skb, 7807 const struct nfnl_info *info, 7808 const struct nlattr * const nla[]) 7809 { 7810 struct netlink_ext_ack *extack = info->extack; 7811 u8 genmask = nft_genmask_next(info->net); 7812 u8 family = info->nfmsg->nfgen_family; 7813 struct nft_flowtable *flowtable; 7814 struct net *net = info->net; 7815 const struct nlattr *attr; 7816 struct nft_table *table; 7817 struct nft_ctx ctx; 7818 7819 if (!nla[NFTA_FLOWTABLE_TABLE] || 7820 (!nla[NFTA_FLOWTABLE_NAME] && 7821 !nla[NFTA_FLOWTABLE_HANDLE])) 7822 return -EINVAL; 7823 7824 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 7825 genmask, NETLINK_CB(skb).portid); 7826 if (IS_ERR(table)) { 7827 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]); 7828 return PTR_ERR(table); 7829 } 7830 7831 if (nla[NFTA_FLOWTABLE_HANDLE]) { 7832 attr = nla[NFTA_FLOWTABLE_HANDLE]; 7833 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask); 7834 } else { 7835 attr = nla[NFTA_FLOWTABLE_NAME]; 7836 flowtable = nft_flowtable_lookup(table, attr, genmask); 7837 } 7838 7839 if (IS_ERR(flowtable)) { 7840 NL_SET_BAD_ATTR(extack, attr); 7841 return PTR_ERR(flowtable); 7842 } 7843 7844 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); 7845 7846 if (nla[NFTA_FLOWTABLE_HOOK]) 7847 return nft_delflowtable_hook(&ctx, flowtable); 7848 7849 if (flowtable->use > 0) { 7850 NL_SET_BAD_ATTR(extack, attr); 7851 return -EBUSY; 7852 } 7853 7854 return nft_delflowtable(&ctx, flowtable); 7855 } 7856 7857 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net, 7858 u32 portid, u32 seq, int event, 7859 u32 flags, int family, 7860 struct nft_flowtable *flowtable, 7861 struct list_head *hook_list) 7862 { 7863 struct nlattr *nest, *nest_devs; 7864 struct nft_hook *hook; 7865 struct nlmsghdr *nlh; 7866 7867 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event); 7868 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family, 7869 NFNETLINK_V0, nft_base_seq(net)); 7870 if (!nlh) 7871 goto nla_put_failure; 7872 7873 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) || 7874 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || 7875 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) || 7876 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle), 7877 NFTA_FLOWTABLE_PAD) || 7878 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags))) 7879 goto nla_put_failure; 7880 7881 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK); 7882 if (!nest) 7883 goto nla_put_failure; 7884 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) || 7885 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority))) 7886 goto nla_put_failure; 7887 7888 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS); 7889 if (!nest_devs) 7890 goto nla_put_failure; 7891 7892 list_for_each_entry_rcu(hook, hook_list, list) { 7893 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name)) 7894 goto nla_put_failure; 7895 } 7896 nla_nest_end(skb, nest_devs); 7897 nla_nest_end(skb, nest); 7898 7899 nlmsg_end(skb, nlh); 7900 return 0; 7901 7902 nla_put_failure: 7903 nlmsg_trim(skb, nlh); 7904 return -1; 7905 } 7906 7907 struct nft_flowtable_filter { 7908 char *table; 7909 }; 7910 7911 static int nf_tables_dump_flowtable(struct sk_buff *skb, 7912 struct netlink_callback *cb) 7913 { 7914 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); 7915 struct nft_flowtable_filter *filter = cb->data; 7916 unsigned int idx = 0, s_idx = cb->args[0]; 7917 struct net *net = sock_net(skb->sk); 7918 int family = nfmsg->nfgen_family; 7919 struct nft_flowtable *flowtable; 7920 struct nftables_pernet *nft_net; 7921 const struct nft_table *table; 7922 7923 rcu_read_lock(); 7924 nft_net = nft_pernet(net); 7925 cb->seq = READ_ONCE(nft_net->base_seq); 7926 7927 list_for_each_entry_rcu(table, &nft_net->tables, list) { 7928 if (family != NFPROTO_UNSPEC && family != table->family) 7929 continue; 7930 7931 list_for_each_entry_rcu(flowtable, &table->flowtables, list) { 7932 if (!nft_is_active(net, flowtable)) 7933 goto cont; 7934 if (idx < s_idx) 7935 goto cont; 7936 if (idx > s_idx) 7937 memset(&cb->args[1], 0, 7938 sizeof(cb->args) - sizeof(cb->args[0])); 7939 if (filter && filter->table && 7940 strcmp(filter->table, table->name)) 7941 goto cont; 7942 7943 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid, 7944 cb->nlh->nlmsg_seq, 7945 NFT_MSG_NEWFLOWTABLE, 7946 NLM_F_MULTI | NLM_F_APPEND, 7947 table->family, 7948 flowtable, 7949 &flowtable->hook_list) < 0) 7950 goto done; 7951 7952 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 7953 cont: 7954 idx++; 7955 } 7956 } 7957 done: 7958 rcu_read_unlock(); 7959 7960 cb->args[0] = idx; 7961 return skb->len; 7962 } 7963 7964 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb) 7965 { 7966 const struct nlattr * const *nla = cb->data; 7967 struct nft_flowtable_filter *filter = NULL; 7968 7969 if (nla[NFTA_FLOWTABLE_TABLE]) { 7970 filter = kzalloc(sizeof(*filter), GFP_ATOMIC); 7971 if (!filter) 7972 return -ENOMEM; 7973 7974 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE], 7975 GFP_ATOMIC); 7976 if (!filter->table) { 7977 kfree(filter); 7978 return -ENOMEM; 7979 } 7980 } 7981 7982 cb->data = filter; 7983 return 0; 7984 } 7985 7986 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb) 7987 { 7988 struct nft_flowtable_filter *filter = cb->data; 7989 7990 if (!filter) 7991 return 0; 7992 7993 kfree(filter->table); 7994 kfree(filter); 7995 7996 return 0; 7997 } 7998 7999 /* called with rcu_read_lock held */ 8000 static int nf_tables_getflowtable(struct sk_buff *skb, 8001 const struct nfnl_info *info, 8002 const struct nlattr * const nla[]) 8003 { 8004 u8 genmask = nft_genmask_cur(info->net); 8005 u8 family = info->nfmsg->nfgen_family; 8006 struct nft_flowtable *flowtable; 8007 const struct nft_table *table; 8008 struct net *net = info->net; 8009 struct sk_buff *skb2; 8010 int err; 8011 8012 if (info->nlh->nlmsg_flags & NLM_F_DUMP) { 8013 struct netlink_dump_control c = { 8014 .start = nf_tables_dump_flowtable_start, 8015 .dump = nf_tables_dump_flowtable, 8016 .done = nf_tables_dump_flowtable_done, 8017 .module = THIS_MODULE, 8018 .data = (void *)nla, 8019 }; 8020 8021 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c); 8022 } 8023 8024 if (!nla[NFTA_FLOWTABLE_NAME]) 8025 return -EINVAL; 8026 8027 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family, 8028 genmask, 0); 8029 if (IS_ERR(table)) 8030 return PTR_ERR(table); 8031 8032 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME], 8033 genmask); 8034 if (IS_ERR(flowtable)) 8035 return PTR_ERR(flowtable); 8036 8037 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 8038 if (!skb2) 8039 return -ENOMEM; 8040 8041 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid, 8042 info->nlh->nlmsg_seq, 8043 NFT_MSG_NEWFLOWTABLE, 0, family, 8044 flowtable, &flowtable->hook_list); 8045 if (err < 0) 8046 goto err_fill_flowtable_info; 8047 8048 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid); 8049 8050 err_fill_flowtable_info: 8051 kfree_skb(skb2); 8052 return err; 8053 } 8054 8055 static void nf_tables_flowtable_notify(struct nft_ctx *ctx, 8056 struct nft_flowtable *flowtable, 8057 struct list_head *hook_list, 8058 int event) 8059 { 8060 struct nftables_pernet *nft_net = nft_pernet(ctx->net); 8061 struct sk_buff *skb; 8062 u16 flags = 0; 8063 int err; 8064 8065 if (!ctx->report && 8066 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES)) 8067 return; 8068 8069 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 8070 if (skb == NULL) 8071 goto err; 8072 8073 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL)) 8074 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL); 8075 8076 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid, 8077 ctx->seq, event, flags, 8078 ctx->family, flowtable, hook_list); 8079 if (err < 0) { 8080 kfree_skb(skb); 8081 goto err; 8082 } 8083 8084 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list); 8085 return; 8086 err: 8087 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS); 8088 } 8089 8090 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable) 8091 { 8092 struct nft_hook *hook, *next; 8093 8094 flowtable->data.type->free(&flowtable->data); 8095 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) { 8096 flowtable->data.type->setup(&flowtable->data, hook->ops.dev, 8097 FLOW_BLOCK_UNBIND); 8098 list_del_rcu(&hook->list); 8099 kfree(hook); 8100 } 8101 kfree(flowtable->name); 8102 module_put(flowtable->data.type->owner); 8103 kfree(flowtable); 8104 } 8105 8106 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net, 8107 u32 portid, u32 seq) 8108 { 8109 struct nftables_pernet *nft_net = nft_pernet(net); 8110 struct nlmsghdr *nlh; 8111 char buf[TASK_COMM_LEN]; 8112 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN); 8113 8114 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC, 8115 NFNETLINK_V0, nft_base_seq(net)); 8116 if (!nlh) 8117 goto nla_put_failure; 8118 8119 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) || 8120 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) || 8121 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current))) 8122 goto nla_put_failure; 8123 8124 nlmsg_end(skb, nlh); 8125 return 0; 8126 8127 nla_put_failure: 8128 nlmsg_trim(skb, nlh); 8129 return -EMSGSIZE; 8130 } 8131 8132 static void nft_flowtable_event(unsigned long event, struct net_device *dev, 8133 struct nft_flowtable *flowtable) 8134 { 8135 struct nft_hook *hook; 8136 8137 list_for_each_entry(hook, &flowtable->hook_list, list) { 8138 if (hook->ops.dev != dev) 8139 continue; 8140 8141 /* flow_offload_netdev_event() cleans up entries for us. */ 8142 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook); 8143 list_del_rcu(&hook->list); 8144 kfree_rcu(hook, rcu); 8145 break; 8146 } 8147 } 8148 8149 static int nf_tables_flowtable_event(struct notifier_block *this, 8150 unsigned long event, void *ptr) 8151 { 8152 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 8153 struct nft_flowtable *flowtable; 8154 struct nftables_pernet *nft_net; 8155 struct nft_table *table; 8156 struct net *net; 8157 8158 if (event != NETDEV_UNREGISTER) 8159 return 0; 8160 8161 net = dev_net(dev); 8162 nft_net = nft_pernet(net); 8163 mutex_lock(&nft_net->commit_mutex); 8164 list_for_each_entry(table, &nft_net->tables, list) { 8165 list_for_each_entry(flowtable, &table->flowtables, list) { 8166 nft_flowtable_event(event, dev, flowtable); 8167 } 8168 } 8169 mutex_unlock(&nft_net->commit_mutex); 8170 8171 return NOTIFY_DONE; 8172 } 8173 8174 static struct notifier_block nf_tables_flowtable_notifier = { 8175 .notifier_call = nf_tables_flowtable_event, 8176 }; 8177 8178 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb, 8179 int event) 8180 { 8181 struct nlmsghdr *nlh = nlmsg_hdr(skb); 8182 struct sk_buff *skb2; 8183 int err; 8184 8185 if (!nlmsg_report(nlh) && 8186 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES)) 8187 return; 8188 8189 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 8190 if (skb2 == NULL) 8191 goto err; 8192 8193 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid, 8194 nlh->nlmsg_seq); 8195 if (err < 0) { 8196 kfree_skb(skb2); 8197 goto err; 8198 } 8199 8200 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, 8201 nlmsg_report(nlh), GFP_KERNEL); 8202 return; 8203 err: 8204 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES, 8205 -ENOBUFS); 8206 } 8207 8208 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info, 8209 const struct nlattr * const nla[]) 8210 { 8211 struct sk_buff *skb2; 8212 int err; 8213 8214 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); 8215 if (skb2 == NULL) 8216 return -ENOMEM; 8217 8218 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid, 8219 info->nlh->nlmsg_seq); 8220 if (err < 0) 8221 goto err_fill_gen_info; 8222 8223 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); 8224 8225 err_fill_gen_info: 8226 kfree_skb(skb2); 8227 return err; 8228 } 8229 8230 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = { 8231 [NFT_MSG_NEWTABLE] = { 8232 .call = nf_tables_newtable, 8233 .type = NFNL_CB_BATCH, 8234 .attr_count = NFTA_TABLE_MAX, 8235 .policy = nft_table_policy, 8236 }, 8237 [NFT_MSG_GETTABLE] = { 8238 .call = nf_tables_gettable, 8239 .type = NFNL_CB_RCU, 8240 .attr_count = NFTA_TABLE_MAX, 8241 .policy = nft_table_policy, 8242 }, 8243 [NFT_MSG_DELTABLE] = { 8244 .call = nf_tables_deltable, 8245 .type = NFNL_CB_BATCH, 8246 .attr_count = NFTA_TABLE_MAX, 8247 .policy = nft_table_policy, 8248 }, 8249 [NFT_MSG_NEWCHAIN] = { 8250 .call = nf_tables_newchain, 8251 .type = NFNL_CB_BATCH, 8252 .attr_count = NFTA_CHAIN_MAX, 8253 .policy = nft_chain_policy, 8254 }, 8255 [NFT_MSG_GETCHAIN] = { 8256 .call = nf_tables_getchain, 8257 .type = NFNL_CB_RCU, 8258 .attr_count = NFTA_CHAIN_MAX, 8259 .policy = nft_chain_policy, 8260 }, 8261 [NFT_MSG_DELCHAIN] = { 8262 .call = nf_tables_delchain, 8263 .type = NFNL_CB_BATCH, 8264 .attr_count = NFTA_CHAIN_MAX, 8265 .policy = nft_chain_policy, 8266 }, 8267 [NFT_MSG_NEWRULE] = { 8268 .call = nf_tables_newrule, 8269 .type = NFNL_CB_BATCH, 8270 .attr_count = NFTA_RULE_MAX, 8271 .policy = nft_rule_policy, 8272 }, 8273 [NFT_MSG_GETRULE] = { 8274 .call = nf_tables_getrule, 8275 .type = NFNL_CB_RCU, 8276 .attr_count = NFTA_RULE_MAX, 8277 .policy = nft_rule_policy, 8278 }, 8279 [NFT_MSG_DELRULE] = { 8280 .call = nf_tables_delrule, 8281 .type = NFNL_CB_BATCH, 8282 .attr_count = NFTA_RULE_MAX, 8283 .policy = nft_rule_policy, 8284 }, 8285 [NFT_MSG_NEWSET] = { 8286 .call = nf_tables_newset, 8287 .type = NFNL_CB_BATCH, 8288 .attr_count = NFTA_SET_MAX, 8289 .policy = nft_set_policy, 8290 }, 8291 [NFT_MSG_GETSET] = { 8292 .call = nf_tables_getset, 8293 .type = NFNL_CB_RCU, 8294 .attr_count = NFTA_SET_MAX, 8295 .policy = nft_set_policy, 8296 }, 8297 [NFT_MSG_DELSET] = { 8298 .call = nf_tables_delset, 8299 .type = NFNL_CB_BATCH, 8300 .attr_count = NFTA_SET_MAX, 8301 .policy = nft_set_policy, 8302 }, 8303 [NFT_MSG_NEWSETELEM] = { 8304 .call = nf_tables_newsetelem, 8305 .type = NFNL_CB_BATCH, 8306 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8307 .policy = nft_set_elem_list_policy, 8308 }, 8309 [NFT_MSG_GETSETELEM] = { 8310 .call = nf_tables_getsetelem, 8311 .type = NFNL_CB_RCU, 8312 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8313 .policy = nft_set_elem_list_policy, 8314 }, 8315 [NFT_MSG_DELSETELEM] = { 8316 .call = nf_tables_delsetelem, 8317 .type = NFNL_CB_BATCH, 8318 .attr_count = NFTA_SET_ELEM_LIST_MAX, 8319 .policy = nft_set_elem_list_policy, 8320 }, 8321 [NFT_MSG_GETGEN] = { 8322 .call = nf_tables_getgen, 8323 .type = NFNL_CB_RCU, 8324 }, 8325 [NFT_MSG_NEWOBJ] = { 8326 .call = nf_tables_newobj, 8327 .type = NFNL_CB_BATCH, 8328 .attr_count = NFTA_OBJ_MAX, 8329 .policy = nft_obj_policy, 8330 }, 8331 [NFT_MSG_GETOBJ] = { 8332 .call = nf_tables_getobj, 8333 .type = NFNL_CB_RCU, 8334 .attr_count = NFTA_OBJ_MAX, 8335 .policy = nft_obj_policy, 8336 }, 8337 [NFT_MSG_DELOBJ] = { 8338 .call = nf_tables_delobj, 8339 .type = NFNL_CB_BATCH, 8340 .attr_count = NFTA_OBJ_MAX, 8341 .policy = nft_obj_policy, 8342 }, 8343 [NFT_MSG_GETOBJ_RESET] = { 8344 .call = nf_tables_getobj, 8345 .type = NFNL_CB_RCU, 8346 .attr_count = NFTA_OBJ_MAX, 8347 .policy = nft_obj_policy, 8348 }, 8349 [NFT_MSG_NEWFLOWTABLE] = { 8350 .call = nf_tables_newflowtable, 8351 .type = NFNL_CB_BATCH, 8352 .attr_count = NFTA_FLOWTABLE_MAX, 8353 .policy = nft_flowtable_policy, 8354 }, 8355 [NFT_MSG_GETFLOWTABLE] = { 8356 .call = nf_tables_getflowtable, 8357 .type = NFNL_CB_RCU, 8358 .attr_count = NFTA_FLOWTABLE_MAX, 8359 .policy = nft_flowtable_policy, 8360 }, 8361 [NFT_MSG_DELFLOWTABLE] = { 8362 .call = nf_tables_delflowtable, 8363 .type = NFNL_CB_BATCH, 8364 .attr_count = NFTA_FLOWTABLE_MAX, 8365 .policy = nft_flowtable_policy, 8366 }, 8367 }; 8368 8369 static int nf_tables_validate(struct net *net) 8370 { 8371 struct nftables_pernet *nft_net = nft_pernet(net); 8372 struct nft_table *table; 8373 8374 switch (nft_net->validate_state) { 8375 case NFT_VALIDATE_SKIP: 8376 break; 8377 case NFT_VALIDATE_NEED: 8378 nft_validate_state_update(net, NFT_VALIDATE_DO); 8379 fallthrough; 8380 case NFT_VALIDATE_DO: 8381 list_for_each_entry(table, &nft_net->tables, list) { 8382 if (nft_table_validate(net, table) < 0) 8383 return -EAGAIN; 8384 } 8385 break; 8386 } 8387 8388 return 0; 8389 } 8390 8391 /* a drop policy has to be deferred until all rules have been activated, 8392 * otherwise a large ruleset that contains a drop-policy base chain will 8393 * cause all packets to get dropped until the full transaction has been 8394 * processed. 8395 * 8396 * We defer the drop policy until the transaction has been finalized. 8397 */ 8398 static void nft_chain_commit_drop_policy(struct nft_trans *trans) 8399 { 8400 struct nft_base_chain *basechain; 8401 8402 if (nft_trans_chain_policy(trans) != NF_DROP) 8403 return; 8404 8405 if (!nft_is_base_chain(trans->ctx.chain)) 8406 return; 8407 8408 basechain = nft_base_chain(trans->ctx.chain); 8409 basechain->policy = NF_DROP; 8410 } 8411 8412 static void nft_chain_commit_update(struct nft_trans *trans) 8413 { 8414 struct nft_base_chain *basechain; 8415 8416 if (nft_trans_chain_name(trans)) { 8417 rhltable_remove(&trans->ctx.table->chains_ht, 8418 &trans->ctx.chain->rhlhead, 8419 nft_chain_ht_params); 8420 swap(trans->ctx.chain->name, nft_trans_chain_name(trans)); 8421 rhltable_insert_key(&trans->ctx.table->chains_ht, 8422 trans->ctx.chain->name, 8423 &trans->ctx.chain->rhlhead, 8424 nft_chain_ht_params); 8425 } 8426 8427 if (!nft_is_base_chain(trans->ctx.chain)) 8428 return; 8429 8430 nft_chain_stats_replace(trans); 8431 8432 basechain = nft_base_chain(trans->ctx.chain); 8433 8434 switch (nft_trans_chain_policy(trans)) { 8435 case NF_DROP: 8436 case NF_ACCEPT: 8437 basechain->policy = nft_trans_chain_policy(trans); 8438 break; 8439 } 8440 } 8441 8442 static void nft_obj_commit_update(struct nft_trans *trans) 8443 { 8444 struct nft_object *newobj; 8445 struct nft_object *obj; 8446 8447 obj = nft_trans_obj(trans); 8448 newobj = nft_trans_obj_newobj(trans); 8449 8450 if (obj->ops->update) 8451 obj->ops->update(obj, newobj); 8452 8453 nft_obj_destroy(&trans->ctx, newobj); 8454 } 8455 8456 static void nft_commit_release(struct nft_trans *trans) 8457 { 8458 switch (trans->msg_type) { 8459 case NFT_MSG_DELTABLE: 8460 nf_tables_table_destroy(&trans->ctx); 8461 break; 8462 case NFT_MSG_NEWCHAIN: 8463 free_percpu(nft_trans_chain_stats(trans)); 8464 kfree(nft_trans_chain_name(trans)); 8465 break; 8466 case NFT_MSG_DELCHAIN: 8467 nf_tables_chain_destroy(&trans->ctx); 8468 break; 8469 case NFT_MSG_DELRULE: 8470 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); 8471 break; 8472 case NFT_MSG_DELSET: 8473 nft_set_destroy(&trans->ctx, nft_trans_set(trans)); 8474 break; 8475 case NFT_MSG_DELSETELEM: 8476 nf_tables_set_elem_destroy(&trans->ctx, 8477 nft_trans_elem_set(trans), 8478 nft_trans_elem(trans).priv); 8479 break; 8480 case NFT_MSG_DELOBJ: 8481 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); 8482 break; 8483 case NFT_MSG_DELFLOWTABLE: 8484 if (nft_trans_flowtable_update(trans)) 8485 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans)); 8486 else 8487 nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); 8488 break; 8489 } 8490 8491 if (trans->put_net) 8492 put_net(trans->ctx.net); 8493 8494 kfree(trans); 8495 } 8496 8497 static void nf_tables_trans_destroy_work(struct work_struct *w) 8498 { 8499 struct nft_trans *trans, *next; 8500 LIST_HEAD(head); 8501 8502 spin_lock(&nf_tables_destroy_list_lock); 8503 list_splice_init(&nf_tables_destroy_list, &head); 8504 spin_unlock(&nf_tables_destroy_list_lock); 8505 8506 if (list_empty(&head)) 8507 return; 8508 8509 synchronize_rcu(); 8510 8511 list_for_each_entry_safe(trans, next, &head, list) { 8512 list_del(&trans->list); 8513 nft_commit_release(trans); 8514 } 8515 } 8516 8517 void nf_tables_trans_destroy_flush_work(void) 8518 { 8519 flush_work(&trans_destroy_work); 8520 } 8521 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work); 8522 8523 static bool nft_expr_reduce(struct nft_regs_track *track, 8524 const struct nft_expr *expr) 8525 { 8526 return false; 8527 } 8528 8529 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain) 8530 { 8531 const struct nft_expr *expr, *last; 8532 struct nft_regs_track track = {}; 8533 unsigned int size, data_size; 8534 void *data, *data_boundary; 8535 struct nft_rule_dp *prule; 8536 struct nft_rule *rule; 8537 8538 /* already handled or inactive chain? */ 8539 if (chain->blob_next || !nft_is_active_next(net, chain)) 8540 return 0; 8541 8542 data_size = 0; 8543 list_for_each_entry(rule, &chain->rules, list) { 8544 if (nft_is_active_next(net, rule)) { 8545 data_size += sizeof(*prule) + rule->dlen; 8546 if (data_size > INT_MAX) 8547 return -ENOMEM; 8548 } 8549 } 8550 data_size += offsetof(struct nft_rule_dp, data); /* last rule */ 8551 8552 chain->blob_next = nf_tables_chain_alloc_rules(data_size); 8553 if (!chain->blob_next) 8554 return -ENOMEM; 8555 8556 data = (void *)chain->blob_next->data; 8557 data_boundary = data + data_size; 8558 size = 0; 8559 8560 list_for_each_entry(rule, &chain->rules, list) { 8561 if (!nft_is_active_next(net, rule)) 8562 continue; 8563 8564 prule = (struct nft_rule_dp *)data; 8565 data += offsetof(struct nft_rule_dp, data); 8566 if (WARN_ON_ONCE(data > data_boundary)) 8567 return -ENOMEM; 8568 8569 size = 0; 8570 track.last = nft_expr_last(rule); 8571 nft_rule_for_each_expr(expr, last, rule) { 8572 track.cur = expr; 8573 8574 if (nft_expr_reduce(&track, expr)) { 8575 expr = track.cur; 8576 continue; 8577 } 8578 8579 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary)) 8580 return -ENOMEM; 8581 8582 memcpy(data + size, expr, expr->ops->size); 8583 size += expr->ops->size; 8584 } 8585 if (WARN_ON_ONCE(size >= 1 << 12)) 8586 return -ENOMEM; 8587 8588 prule->handle = rule->handle; 8589 prule->dlen = size; 8590 prule->is_last = 0; 8591 8592 data += size; 8593 size = 0; 8594 chain->blob_next->size += (unsigned long)(data - (void *)prule); 8595 } 8596 8597 prule = (struct nft_rule_dp *)data; 8598 data += offsetof(struct nft_rule_dp, data); 8599 if (WARN_ON_ONCE(data > data_boundary)) 8600 return -ENOMEM; 8601 8602 nft_last_rule(chain->blob_next, prule); 8603 8604 return 0; 8605 } 8606 8607 static void nf_tables_commit_chain_prepare_cancel(struct net *net) 8608 { 8609 struct nftables_pernet *nft_net = nft_pernet(net); 8610 struct nft_trans *trans, *next; 8611 8612 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8613 struct nft_chain *chain = trans->ctx.chain; 8614 8615 if (trans->msg_type == NFT_MSG_NEWRULE || 8616 trans->msg_type == NFT_MSG_DELRULE) { 8617 kvfree(chain->blob_next); 8618 chain->blob_next = NULL; 8619 } 8620 } 8621 } 8622 8623 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h) 8624 { 8625 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h); 8626 8627 kvfree(o->blob); 8628 } 8629 8630 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob) 8631 { 8632 struct nft_rules_old *old; 8633 8634 /* rcu_head is after end marker */ 8635 old = (void *)blob + sizeof(*blob) + blob->size; 8636 old->blob = blob; 8637 8638 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old); 8639 } 8640 8641 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain) 8642 { 8643 struct nft_rule_blob *g0, *g1; 8644 bool next_genbit; 8645 8646 next_genbit = nft_gencursor_next(net); 8647 8648 g0 = rcu_dereference_protected(chain->blob_gen_0, 8649 lockdep_commit_lock_is_held(net)); 8650 g1 = rcu_dereference_protected(chain->blob_gen_1, 8651 lockdep_commit_lock_is_held(net)); 8652 8653 /* No changes to this chain? */ 8654 if (chain->blob_next == NULL) { 8655 /* chain had no change in last or next generation */ 8656 if (g0 == g1) 8657 return; 8658 /* 8659 * chain had no change in this generation; make sure next 8660 * one uses same rules as current generation. 8661 */ 8662 if (next_genbit) { 8663 rcu_assign_pointer(chain->blob_gen_1, g0); 8664 nf_tables_commit_chain_free_rules_old(g1); 8665 } else { 8666 rcu_assign_pointer(chain->blob_gen_0, g1); 8667 nf_tables_commit_chain_free_rules_old(g0); 8668 } 8669 8670 return; 8671 } 8672 8673 if (next_genbit) 8674 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next); 8675 else 8676 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next); 8677 8678 chain->blob_next = NULL; 8679 8680 if (g0 == g1) 8681 return; 8682 8683 if (next_genbit) 8684 nf_tables_commit_chain_free_rules_old(g1); 8685 else 8686 nf_tables_commit_chain_free_rules_old(g0); 8687 } 8688 8689 static void nft_obj_del(struct nft_object *obj) 8690 { 8691 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params); 8692 list_del_rcu(&obj->list); 8693 } 8694 8695 void nft_chain_del(struct nft_chain *chain) 8696 { 8697 struct nft_table *table = chain->table; 8698 8699 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead, 8700 nft_chain_ht_params)); 8701 list_del_rcu(&chain->list); 8702 } 8703 8704 static void nf_tables_module_autoload_cleanup(struct net *net) 8705 { 8706 struct nftables_pernet *nft_net = nft_pernet(net); 8707 struct nft_module_request *req, *next; 8708 8709 WARN_ON_ONCE(!list_empty(&nft_net->commit_list)); 8710 list_for_each_entry_safe(req, next, &nft_net->module_list, list) { 8711 WARN_ON_ONCE(!req->done); 8712 list_del(&req->list); 8713 kfree(req); 8714 } 8715 } 8716 8717 static void nf_tables_commit_release(struct net *net) 8718 { 8719 struct nftables_pernet *nft_net = nft_pernet(net); 8720 struct nft_trans *trans; 8721 8722 /* all side effects have to be made visible. 8723 * For example, if a chain named 'foo' has been deleted, a 8724 * new transaction must not find it anymore. 8725 * 8726 * Memory reclaim happens asynchronously from work queue 8727 * to prevent expensive synchronize_rcu() in commit phase. 8728 */ 8729 if (list_empty(&nft_net->commit_list)) { 8730 nf_tables_module_autoload_cleanup(net); 8731 mutex_unlock(&nft_net->commit_mutex); 8732 return; 8733 } 8734 8735 trans = list_last_entry(&nft_net->commit_list, 8736 struct nft_trans, list); 8737 get_net(trans->ctx.net); 8738 WARN_ON_ONCE(trans->put_net); 8739 8740 trans->put_net = true; 8741 spin_lock(&nf_tables_destroy_list_lock); 8742 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list); 8743 spin_unlock(&nf_tables_destroy_list_lock); 8744 8745 nf_tables_module_autoload_cleanup(net); 8746 schedule_work(&trans_destroy_work); 8747 8748 mutex_unlock(&nft_net->commit_mutex); 8749 } 8750 8751 static void nft_commit_notify(struct net *net, u32 portid) 8752 { 8753 struct nftables_pernet *nft_net = nft_pernet(net); 8754 struct sk_buff *batch_skb = NULL, *nskb, *skb; 8755 unsigned char *data; 8756 int len; 8757 8758 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) { 8759 if (!batch_skb) { 8760 new_batch: 8761 batch_skb = skb; 8762 len = NLMSG_GOODSIZE - skb->len; 8763 list_del(&skb->list); 8764 continue; 8765 } 8766 len -= skb->len; 8767 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) { 8768 data = skb_put(batch_skb, skb->len); 8769 memcpy(data, skb->data, skb->len); 8770 list_del(&skb->list); 8771 kfree_skb(skb); 8772 continue; 8773 } 8774 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES, 8775 NFT_CB(batch_skb).report, GFP_KERNEL); 8776 goto new_batch; 8777 } 8778 8779 if (batch_skb) { 8780 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES, 8781 NFT_CB(batch_skb).report, GFP_KERNEL); 8782 } 8783 8784 WARN_ON_ONCE(!list_empty(&nft_net->notify_list)); 8785 } 8786 8787 static int nf_tables_commit_audit_alloc(struct list_head *adl, 8788 struct nft_table *table) 8789 { 8790 struct nft_audit_data *adp; 8791 8792 list_for_each_entry(adp, adl, list) { 8793 if (adp->table == table) 8794 return 0; 8795 } 8796 adp = kzalloc(sizeof(*adp), GFP_KERNEL); 8797 if (!adp) 8798 return -ENOMEM; 8799 adp->table = table; 8800 list_add(&adp->list, adl); 8801 return 0; 8802 } 8803 8804 static void nf_tables_commit_audit_free(struct list_head *adl) 8805 { 8806 struct nft_audit_data *adp, *adn; 8807 8808 list_for_each_entry_safe(adp, adn, adl, list) { 8809 list_del(&adp->list); 8810 kfree(adp); 8811 } 8812 } 8813 8814 static void nf_tables_commit_audit_collect(struct list_head *adl, 8815 struct nft_table *table, u32 op) 8816 { 8817 struct nft_audit_data *adp; 8818 8819 list_for_each_entry(adp, adl, list) { 8820 if (adp->table == table) 8821 goto found; 8822 } 8823 WARN_ONCE(1, "table=%s not expected in commit list", table->name); 8824 return; 8825 found: 8826 adp->entries++; 8827 if (!adp->op || adp->op > op) 8828 adp->op = op; 8829 } 8830 8831 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22) 8832 8833 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation) 8834 { 8835 struct nft_audit_data *adp, *adn; 8836 char aubuf[AUNFTABLENAMELEN]; 8837 8838 list_for_each_entry_safe(adp, adn, adl, list) { 8839 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name, 8840 generation); 8841 audit_log_nfcfg(aubuf, adp->table->family, adp->entries, 8842 nft2audit_op[adp->op], GFP_KERNEL); 8843 list_del(&adp->list); 8844 kfree(adp); 8845 } 8846 } 8847 8848 static int nf_tables_commit(struct net *net, struct sk_buff *skb) 8849 { 8850 struct nftables_pernet *nft_net = nft_pernet(net); 8851 struct nft_trans *trans, *next; 8852 struct nft_trans_elem *te; 8853 struct nft_chain *chain; 8854 struct nft_table *table; 8855 unsigned int base_seq; 8856 LIST_HEAD(adl); 8857 int err; 8858 8859 if (list_empty(&nft_net->commit_list)) { 8860 mutex_unlock(&nft_net->commit_mutex); 8861 return 0; 8862 } 8863 8864 /* 0. Validate ruleset, otherwise roll back for error reporting. */ 8865 if (nf_tables_validate(net) < 0) 8866 return -EAGAIN; 8867 8868 err = nft_flow_rule_offload_commit(net); 8869 if (err < 0) 8870 return err; 8871 8872 /* 1. Allocate space for next generation rules_gen_X[] */ 8873 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8874 int ret; 8875 8876 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table); 8877 if (ret) { 8878 nf_tables_commit_chain_prepare_cancel(net); 8879 nf_tables_commit_audit_free(&adl); 8880 return ret; 8881 } 8882 if (trans->msg_type == NFT_MSG_NEWRULE || 8883 trans->msg_type == NFT_MSG_DELRULE) { 8884 chain = trans->ctx.chain; 8885 8886 ret = nf_tables_commit_chain_prepare(net, chain); 8887 if (ret < 0) { 8888 nf_tables_commit_chain_prepare_cancel(net); 8889 nf_tables_commit_audit_free(&adl); 8890 return ret; 8891 } 8892 } 8893 } 8894 8895 /* step 2. Make rules_gen_X visible to packet path */ 8896 list_for_each_entry(table, &nft_net->tables, list) { 8897 list_for_each_entry(chain, &table->chains, list) 8898 nf_tables_commit_chain(net, chain); 8899 } 8900 8901 /* 8902 * Bump generation counter, invalidate any dump in progress. 8903 * Cannot fail after this point. 8904 */ 8905 base_seq = READ_ONCE(nft_net->base_seq); 8906 while (++base_seq == 0) 8907 ; 8908 8909 WRITE_ONCE(nft_net->base_seq, base_seq); 8910 8911 /* step 3. Start new generation, rules_gen_X now in use. */ 8912 net->nft.gencursor = nft_gencursor_next(net); 8913 8914 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) { 8915 nf_tables_commit_audit_collect(&adl, trans->ctx.table, 8916 trans->msg_type); 8917 switch (trans->msg_type) { 8918 case NFT_MSG_NEWTABLE: 8919 if (nft_trans_table_update(trans)) { 8920 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) { 8921 nft_trans_destroy(trans); 8922 break; 8923 } 8924 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT) 8925 nf_tables_table_disable(net, trans->ctx.table); 8926 8927 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE; 8928 } else { 8929 nft_clear(net, trans->ctx.table); 8930 } 8931 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE); 8932 nft_trans_destroy(trans); 8933 break; 8934 case NFT_MSG_DELTABLE: 8935 list_del_rcu(&trans->ctx.table->list); 8936 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE); 8937 break; 8938 case NFT_MSG_NEWCHAIN: 8939 if (nft_trans_chain_update(trans)) { 8940 nft_chain_commit_update(trans); 8941 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); 8942 /* trans destroyed after rcu grace period */ 8943 } else { 8944 nft_chain_commit_drop_policy(trans); 8945 nft_clear(net, trans->ctx.chain); 8946 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN); 8947 nft_trans_destroy(trans); 8948 } 8949 break; 8950 case NFT_MSG_DELCHAIN: 8951 nft_chain_del(trans->ctx.chain); 8952 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN); 8953 nf_tables_unregister_hook(trans->ctx.net, 8954 trans->ctx.table, 8955 trans->ctx.chain); 8956 break; 8957 case NFT_MSG_NEWRULE: 8958 nft_clear(trans->ctx.net, nft_trans_rule(trans)); 8959 nf_tables_rule_notify(&trans->ctx, 8960 nft_trans_rule(trans), 8961 NFT_MSG_NEWRULE); 8962 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 8963 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 8964 8965 nft_trans_destroy(trans); 8966 break; 8967 case NFT_MSG_DELRULE: 8968 list_del_rcu(&nft_trans_rule(trans)->list); 8969 nf_tables_rule_notify(&trans->ctx, 8970 nft_trans_rule(trans), 8971 NFT_MSG_DELRULE); 8972 nft_rule_expr_deactivate(&trans->ctx, 8973 nft_trans_rule(trans), 8974 NFT_TRANS_COMMIT); 8975 8976 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 8977 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 8978 break; 8979 case NFT_MSG_NEWSET: 8980 nft_clear(net, nft_trans_set(trans)); 8981 /* This avoids hitting -EBUSY when deleting the table 8982 * from the transaction. 8983 */ 8984 if (nft_set_is_anonymous(nft_trans_set(trans)) && 8985 !list_empty(&nft_trans_set(trans)->bindings)) 8986 trans->ctx.table->use--; 8987 8988 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), 8989 NFT_MSG_NEWSET, GFP_KERNEL); 8990 nft_trans_destroy(trans); 8991 break; 8992 case NFT_MSG_DELSET: 8993 list_del_rcu(&nft_trans_set(trans)->list); 8994 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans), 8995 NFT_MSG_DELSET, GFP_KERNEL); 8996 break; 8997 case NFT_MSG_NEWSETELEM: 8998 te = (struct nft_trans_elem *)trans->data; 8999 9000 nft_setelem_activate(net, te->set, &te->elem); 9001 nf_tables_setelem_notify(&trans->ctx, te->set, 9002 &te->elem, 9003 NFT_MSG_NEWSETELEM); 9004 nft_trans_destroy(trans); 9005 break; 9006 case NFT_MSG_DELSETELEM: 9007 te = (struct nft_trans_elem *)trans->data; 9008 9009 nf_tables_setelem_notify(&trans->ctx, te->set, 9010 &te->elem, 9011 NFT_MSG_DELSETELEM); 9012 nft_setelem_remove(net, te->set, &te->elem); 9013 if (!nft_setelem_is_catchall(te->set, &te->elem)) { 9014 atomic_dec(&te->set->nelems); 9015 te->set->ndeact--; 9016 } 9017 break; 9018 case NFT_MSG_NEWOBJ: 9019 if (nft_trans_obj_update(trans)) { 9020 nft_obj_commit_update(trans); 9021 nf_tables_obj_notify(&trans->ctx, 9022 nft_trans_obj(trans), 9023 NFT_MSG_NEWOBJ); 9024 } else { 9025 nft_clear(net, nft_trans_obj(trans)); 9026 nf_tables_obj_notify(&trans->ctx, 9027 nft_trans_obj(trans), 9028 NFT_MSG_NEWOBJ); 9029 nft_trans_destroy(trans); 9030 } 9031 break; 9032 case NFT_MSG_DELOBJ: 9033 nft_obj_del(nft_trans_obj(trans)); 9034 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans), 9035 NFT_MSG_DELOBJ); 9036 break; 9037 case NFT_MSG_NEWFLOWTABLE: 9038 if (nft_trans_flowtable_update(trans)) { 9039 nft_trans_flowtable(trans)->data.flags = 9040 nft_trans_flowtable_flags(trans); 9041 nf_tables_flowtable_notify(&trans->ctx, 9042 nft_trans_flowtable(trans), 9043 &nft_trans_flowtable_hooks(trans), 9044 NFT_MSG_NEWFLOWTABLE); 9045 list_splice(&nft_trans_flowtable_hooks(trans), 9046 &nft_trans_flowtable(trans)->hook_list); 9047 } else { 9048 nft_clear(net, nft_trans_flowtable(trans)); 9049 nf_tables_flowtable_notify(&trans->ctx, 9050 nft_trans_flowtable(trans), 9051 &nft_trans_flowtable(trans)->hook_list, 9052 NFT_MSG_NEWFLOWTABLE); 9053 } 9054 nft_trans_destroy(trans); 9055 break; 9056 case NFT_MSG_DELFLOWTABLE: 9057 if (nft_trans_flowtable_update(trans)) { 9058 nf_tables_flowtable_notify(&trans->ctx, 9059 nft_trans_flowtable(trans), 9060 &nft_trans_flowtable_hooks(trans), 9061 NFT_MSG_DELFLOWTABLE); 9062 nft_unregister_flowtable_net_hooks(net, 9063 &nft_trans_flowtable_hooks(trans)); 9064 } else { 9065 list_del_rcu(&nft_trans_flowtable(trans)->list); 9066 nf_tables_flowtable_notify(&trans->ctx, 9067 nft_trans_flowtable(trans), 9068 &nft_trans_flowtable(trans)->hook_list, 9069 NFT_MSG_DELFLOWTABLE); 9070 nft_unregister_flowtable_net_hooks(net, 9071 &nft_trans_flowtable(trans)->hook_list); 9072 } 9073 break; 9074 } 9075 } 9076 9077 nft_commit_notify(net, NETLINK_CB(skb).portid); 9078 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN); 9079 nf_tables_commit_audit_log(&adl, nft_net->base_seq); 9080 nf_tables_commit_release(net); 9081 9082 return 0; 9083 } 9084 9085 static void nf_tables_module_autoload(struct net *net) 9086 { 9087 struct nftables_pernet *nft_net = nft_pernet(net); 9088 struct nft_module_request *req, *next; 9089 LIST_HEAD(module_list); 9090 9091 list_splice_init(&nft_net->module_list, &module_list); 9092 mutex_unlock(&nft_net->commit_mutex); 9093 list_for_each_entry_safe(req, next, &module_list, list) { 9094 request_module("%s", req->module); 9095 req->done = true; 9096 } 9097 mutex_lock(&nft_net->commit_mutex); 9098 list_splice(&module_list, &nft_net->module_list); 9099 } 9100 9101 static void nf_tables_abort_release(struct nft_trans *trans) 9102 { 9103 switch (trans->msg_type) { 9104 case NFT_MSG_NEWTABLE: 9105 nf_tables_table_destroy(&trans->ctx); 9106 break; 9107 case NFT_MSG_NEWCHAIN: 9108 nf_tables_chain_destroy(&trans->ctx); 9109 break; 9110 case NFT_MSG_NEWRULE: 9111 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans)); 9112 break; 9113 case NFT_MSG_NEWSET: 9114 nft_set_destroy(&trans->ctx, nft_trans_set(trans)); 9115 break; 9116 case NFT_MSG_NEWSETELEM: 9117 nft_set_elem_destroy(nft_trans_elem_set(trans), 9118 nft_trans_elem(trans).priv, true); 9119 break; 9120 case NFT_MSG_NEWOBJ: 9121 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans)); 9122 break; 9123 case NFT_MSG_NEWFLOWTABLE: 9124 if (nft_trans_flowtable_update(trans)) 9125 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans)); 9126 else 9127 nf_tables_flowtable_destroy(nft_trans_flowtable(trans)); 9128 break; 9129 } 9130 kfree(trans); 9131 } 9132 9133 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action) 9134 { 9135 struct nftables_pernet *nft_net = nft_pernet(net); 9136 struct nft_trans *trans, *next; 9137 struct nft_trans_elem *te; 9138 9139 if (action == NFNL_ABORT_VALIDATE && 9140 nf_tables_validate(net) < 0) 9141 return -EAGAIN; 9142 9143 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list, 9144 list) { 9145 switch (trans->msg_type) { 9146 case NFT_MSG_NEWTABLE: 9147 if (nft_trans_table_update(trans)) { 9148 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) { 9149 nft_trans_destroy(trans); 9150 break; 9151 } 9152 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) { 9153 nf_tables_table_disable(net, trans->ctx.table); 9154 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT; 9155 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) { 9156 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT; 9157 } 9158 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE; 9159 nft_trans_destroy(trans); 9160 } else { 9161 list_del_rcu(&trans->ctx.table->list); 9162 } 9163 break; 9164 case NFT_MSG_DELTABLE: 9165 nft_clear(trans->ctx.net, trans->ctx.table); 9166 nft_trans_destroy(trans); 9167 break; 9168 case NFT_MSG_NEWCHAIN: 9169 if (nft_trans_chain_update(trans)) { 9170 free_percpu(nft_trans_chain_stats(trans)); 9171 kfree(nft_trans_chain_name(trans)); 9172 nft_trans_destroy(trans); 9173 } else { 9174 if (nft_chain_is_bound(trans->ctx.chain)) { 9175 nft_trans_destroy(trans); 9176 break; 9177 } 9178 trans->ctx.table->use--; 9179 nft_chain_del(trans->ctx.chain); 9180 nf_tables_unregister_hook(trans->ctx.net, 9181 trans->ctx.table, 9182 trans->ctx.chain); 9183 } 9184 break; 9185 case NFT_MSG_DELCHAIN: 9186 trans->ctx.table->use++; 9187 nft_clear(trans->ctx.net, trans->ctx.chain); 9188 nft_trans_destroy(trans); 9189 break; 9190 case NFT_MSG_NEWRULE: 9191 trans->ctx.chain->use--; 9192 list_del_rcu(&nft_trans_rule(trans)->list); 9193 nft_rule_expr_deactivate(&trans->ctx, 9194 nft_trans_rule(trans), 9195 NFT_TRANS_ABORT); 9196 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 9197 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 9198 break; 9199 case NFT_MSG_DELRULE: 9200 trans->ctx.chain->use++; 9201 nft_clear(trans->ctx.net, nft_trans_rule(trans)); 9202 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans)); 9203 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) 9204 nft_flow_rule_destroy(nft_trans_flow_rule(trans)); 9205 9206 nft_trans_destroy(trans); 9207 break; 9208 case NFT_MSG_NEWSET: 9209 trans->ctx.table->use--; 9210 if (nft_trans_set_bound(trans)) { 9211 nft_trans_destroy(trans); 9212 break; 9213 } 9214 list_del_rcu(&nft_trans_set(trans)->list); 9215 break; 9216 case NFT_MSG_DELSET: 9217 trans->ctx.table->use++; 9218 nft_clear(trans->ctx.net, nft_trans_set(trans)); 9219 nft_trans_destroy(trans); 9220 break; 9221 case NFT_MSG_NEWSETELEM: 9222 if (nft_trans_elem_set_bound(trans)) { 9223 nft_trans_destroy(trans); 9224 break; 9225 } 9226 te = (struct nft_trans_elem *)trans->data; 9227 nft_setelem_remove(net, te->set, &te->elem); 9228 if (!nft_setelem_is_catchall(te->set, &te->elem)) 9229 atomic_dec(&te->set->nelems); 9230 break; 9231 case NFT_MSG_DELSETELEM: 9232 te = (struct nft_trans_elem *)trans->data; 9233 9234 nft_setelem_data_activate(net, te->set, &te->elem); 9235 nft_setelem_activate(net, te->set, &te->elem); 9236 if (!nft_setelem_is_catchall(te->set, &te->elem)) 9237 te->set->ndeact--; 9238 9239 nft_trans_destroy(trans); 9240 break; 9241 case NFT_MSG_NEWOBJ: 9242 if (nft_trans_obj_update(trans)) { 9243 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans)); 9244 nft_trans_destroy(trans); 9245 } else { 9246 trans->ctx.table->use--; 9247 nft_obj_del(nft_trans_obj(trans)); 9248 } 9249 break; 9250 case NFT_MSG_DELOBJ: 9251 trans->ctx.table->use++; 9252 nft_clear(trans->ctx.net, nft_trans_obj(trans)); 9253 nft_trans_destroy(trans); 9254 break; 9255 case NFT_MSG_NEWFLOWTABLE: 9256 if (nft_trans_flowtable_update(trans)) { 9257 nft_unregister_flowtable_net_hooks(net, 9258 &nft_trans_flowtable_hooks(trans)); 9259 } else { 9260 trans->ctx.table->use--; 9261 list_del_rcu(&nft_trans_flowtable(trans)->list); 9262 nft_unregister_flowtable_net_hooks(net, 9263 &nft_trans_flowtable(trans)->hook_list); 9264 } 9265 break; 9266 case NFT_MSG_DELFLOWTABLE: 9267 if (nft_trans_flowtable_update(trans)) { 9268 list_splice(&nft_trans_flowtable_hooks(trans), 9269 &nft_trans_flowtable(trans)->hook_list); 9270 } else { 9271 trans->ctx.table->use++; 9272 nft_clear(trans->ctx.net, nft_trans_flowtable(trans)); 9273 } 9274 nft_trans_destroy(trans); 9275 break; 9276 } 9277 } 9278 9279 synchronize_rcu(); 9280 9281 list_for_each_entry_safe_reverse(trans, next, 9282 &nft_net->commit_list, list) { 9283 list_del(&trans->list); 9284 nf_tables_abort_release(trans); 9285 } 9286 9287 if (action == NFNL_ABORT_AUTOLOAD) 9288 nf_tables_module_autoload(net); 9289 else 9290 nf_tables_module_autoload_cleanup(net); 9291 9292 return 0; 9293 } 9294 9295 static void nf_tables_cleanup(struct net *net) 9296 { 9297 nft_validate_state_update(net, NFT_VALIDATE_SKIP); 9298 } 9299 9300 static int nf_tables_abort(struct net *net, struct sk_buff *skb, 9301 enum nfnl_abort_action action) 9302 { 9303 struct nftables_pernet *nft_net = nft_pernet(net); 9304 int ret = __nf_tables_abort(net, action); 9305 9306 mutex_unlock(&nft_net->commit_mutex); 9307 9308 return ret; 9309 } 9310 9311 static bool nf_tables_valid_genid(struct net *net, u32 genid) 9312 { 9313 struct nftables_pernet *nft_net = nft_pernet(net); 9314 bool genid_ok; 9315 9316 mutex_lock(&nft_net->commit_mutex); 9317 9318 genid_ok = genid == 0 || nft_net->base_seq == genid; 9319 if (!genid_ok) 9320 mutex_unlock(&nft_net->commit_mutex); 9321 9322 /* else, commit mutex has to be released by commit or abort function */ 9323 return genid_ok; 9324 } 9325 9326 static const struct nfnetlink_subsystem nf_tables_subsys = { 9327 .name = "nf_tables", 9328 .subsys_id = NFNL_SUBSYS_NFTABLES, 9329 .cb_count = NFT_MSG_MAX, 9330 .cb = nf_tables_cb, 9331 .commit = nf_tables_commit, 9332 .abort = nf_tables_abort, 9333 .cleanup = nf_tables_cleanup, 9334 .valid_genid = nf_tables_valid_genid, 9335 .owner = THIS_MODULE, 9336 }; 9337 9338 int nft_chain_validate_dependency(const struct nft_chain *chain, 9339 enum nft_chain_types type) 9340 { 9341 const struct nft_base_chain *basechain; 9342 9343 if (nft_is_base_chain(chain)) { 9344 basechain = nft_base_chain(chain); 9345 if (basechain->type->type != type) 9346 return -EOPNOTSUPP; 9347 } 9348 return 0; 9349 } 9350 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency); 9351 9352 int nft_chain_validate_hooks(const struct nft_chain *chain, 9353 unsigned int hook_flags) 9354 { 9355 struct nft_base_chain *basechain; 9356 9357 if (nft_is_base_chain(chain)) { 9358 basechain = nft_base_chain(chain); 9359 9360 if ((1 << basechain->ops.hooknum) & hook_flags) 9361 return 0; 9362 9363 return -EOPNOTSUPP; 9364 } 9365 9366 return 0; 9367 } 9368 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks); 9369 9370 /* 9371 * Loop detection - walk through the ruleset beginning at the destination chain 9372 * of a new jump until either the source chain is reached (loop) or all 9373 * reachable chains have been traversed. 9374 * 9375 * The loop check is performed whenever a new jump verdict is added to an 9376 * expression or verdict map or a verdict map is bound to a new chain. 9377 */ 9378 9379 static int nf_tables_check_loops(const struct nft_ctx *ctx, 9380 const struct nft_chain *chain); 9381 9382 static int nft_check_loops(const struct nft_ctx *ctx, 9383 const struct nft_set_ext *ext) 9384 { 9385 const struct nft_data *data; 9386 int ret; 9387 9388 data = nft_set_ext_data(ext); 9389 switch (data->verdict.code) { 9390 case NFT_JUMP: 9391 case NFT_GOTO: 9392 ret = nf_tables_check_loops(ctx, data->verdict.chain); 9393 break; 9394 default: 9395 ret = 0; 9396 break; 9397 } 9398 9399 return ret; 9400 } 9401 9402 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, 9403 struct nft_set *set, 9404 const struct nft_set_iter *iter, 9405 struct nft_set_elem *elem) 9406 { 9407 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); 9408 9409 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && 9410 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) 9411 return 0; 9412 9413 return nft_check_loops(ctx, ext); 9414 } 9415 9416 static int nft_set_catchall_loops(const struct nft_ctx *ctx, 9417 struct nft_set *set) 9418 { 9419 u8 genmask = nft_genmask_next(ctx->net); 9420 struct nft_set_elem_catchall *catchall; 9421 struct nft_set_ext *ext; 9422 int ret = 0; 9423 9424 list_for_each_entry_rcu(catchall, &set->catchall_list, list) { 9425 ext = nft_set_elem_ext(set, catchall->elem); 9426 if (!nft_set_elem_active(ext, genmask)) 9427 continue; 9428 9429 ret = nft_check_loops(ctx, ext); 9430 if (ret < 0) 9431 return ret; 9432 } 9433 9434 return ret; 9435 } 9436 9437 static int nf_tables_check_loops(const struct nft_ctx *ctx, 9438 const struct nft_chain *chain) 9439 { 9440 const struct nft_rule *rule; 9441 const struct nft_expr *expr, *last; 9442 struct nft_set *set; 9443 struct nft_set_binding *binding; 9444 struct nft_set_iter iter; 9445 9446 if (ctx->chain == chain) 9447 return -ELOOP; 9448 9449 list_for_each_entry(rule, &chain->rules, list) { 9450 nft_rule_for_each_expr(expr, last, rule) { 9451 struct nft_immediate_expr *priv; 9452 const struct nft_data *data; 9453 int err; 9454 9455 if (strcmp(expr->ops->type->name, "immediate")) 9456 continue; 9457 9458 priv = nft_expr_priv(expr); 9459 if (priv->dreg != NFT_REG_VERDICT) 9460 continue; 9461 9462 data = &priv->data; 9463 switch (data->verdict.code) { 9464 case NFT_JUMP: 9465 case NFT_GOTO: 9466 err = nf_tables_check_loops(ctx, 9467 data->verdict.chain); 9468 if (err < 0) 9469 return err; 9470 break; 9471 default: 9472 break; 9473 } 9474 } 9475 } 9476 9477 list_for_each_entry(set, &ctx->table->sets, list) { 9478 if (!nft_is_active_next(ctx->net, set)) 9479 continue; 9480 if (!(set->flags & NFT_SET_MAP) || 9481 set->dtype != NFT_DATA_VERDICT) 9482 continue; 9483 9484 list_for_each_entry(binding, &set->bindings, list) { 9485 if (!(binding->flags & NFT_SET_MAP) || 9486 binding->chain != chain) 9487 continue; 9488 9489 iter.genmask = nft_genmask_next(ctx->net); 9490 iter.skip = 0; 9491 iter.count = 0; 9492 iter.err = 0; 9493 iter.fn = nf_tables_loop_check_setelem; 9494 9495 set->ops->walk(ctx, set, &iter); 9496 if (!iter.err) 9497 iter.err = nft_set_catchall_loops(ctx, set); 9498 9499 if (iter.err < 0) 9500 return iter.err; 9501 } 9502 } 9503 9504 return 0; 9505 } 9506 9507 /** 9508 * nft_parse_u32_check - fetch u32 attribute and check for maximum value 9509 * 9510 * @attr: netlink attribute to fetch value from 9511 * @max: maximum value to be stored in dest 9512 * @dest: pointer to the variable 9513 * 9514 * Parse, check and store a given u32 netlink attribute into variable. 9515 * This function returns -ERANGE if the value goes over maximum value. 9516 * Otherwise a 0 is returned and the attribute value is stored in the 9517 * destination variable. 9518 */ 9519 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest) 9520 { 9521 u32 val; 9522 9523 val = ntohl(nla_get_be32(attr)); 9524 if (val > max) 9525 return -ERANGE; 9526 9527 *dest = val; 9528 return 0; 9529 } 9530 EXPORT_SYMBOL_GPL(nft_parse_u32_check); 9531 9532 static int nft_parse_register(const struct nlattr *attr, u32 *preg) 9533 { 9534 unsigned int reg; 9535 9536 reg = ntohl(nla_get_be32(attr)); 9537 switch (reg) { 9538 case NFT_REG_VERDICT...NFT_REG_4: 9539 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE; 9540 break; 9541 case NFT_REG32_00...NFT_REG32_15: 9542 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00; 9543 break; 9544 default: 9545 return -ERANGE; 9546 } 9547 9548 return 0; 9549 } 9550 9551 /** 9552 * nft_dump_register - dump a register value to a netlink attribute 9553 * 9554 * @skb: socket buffer 9555 * @attr: attribute number 9556 * @reg: register number 9557 * 9558 * Construct a netlink attribute containing the register number. For 9559 * compatibility reasons, register numbers being a multiple of 4 are 9560 * translated to the corresponding 128 bit register numbers. 9561 */ 9562 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg) 9563 { 9564 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0) 9565 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE); 9566 else 9567 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00; 9568 9569 return nla_put_be32(skb, attr, htonl(reg)); 9570 } 9571 EXPORT_SYMBOL_GPL(nft_dump_register); 9572 9573 static int nft_validate_register_load(enum nft_registers reg, unsigned int len) 9574 { 9575 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) 9576 return -EINVAL; 9577 if (len == 0) 9578 return -EINVAL; 9579 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data)) 9580 return -ERANGE; 9581 9582 return 0; 9583 } 9584 9585 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len) 9586 { 9587 u32 reg; 9588 int err; 9589 9590 err = nft_parse_register(attr, ®); 9591 if (err < 0) 9592 return err; 9593 9594 err = nft_validate_register_load(reg, len); 9595 if (err < 0) 9596 return err; 9597 9598 *sreg = reg; 9599 return 0; 9600 } 9601 EXPORT_SYMBOL_GPL(nft_parse_register_load); 9602 9603 static int nft_validate_register_store(const struct nft_ctx *ctx, 9604 enum nft_registers reg, 9605 const struct nft_data *data, 9606 enum nft_data_types type, 9607 unsigned int len) 9608 { 9609 int err; 9610 9611 switch (reg) { 9612 case NFT_REG_VERDICT: 9613 if (type != NFT_DATA_VERDICT) 9614 return -EINVAL; 9615 9616 if (data != NULL && 9617 (data->verdict.code == NFT_GOTO || 9618 data->verdict.code == NFT_JUMP)) { 9619 err = nf_tables_check_loops(ctx, data->verdict.chain); 9620 if (err < 0) 9621 return err; 9622 } 9623 9624 return 0; 9625 default: 9626 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE) 9627 return -EINVAL; 9628 if (len == 0) 9629 return -EINVAL; 9630 if (reg * NFT_REG32_SIZE + len > 9631 sizeof_field(struct nft_regs, data)) 9632 return -ERANGE; 9633 9634 if (data != NULL && type != NFT_DATA_VALUE) 9635 return -EINVAL; 9636 return 0; 9637 } 9638 } 9639 9640 int nft_parse_register_store(const struct nft_ctx *ctx, 9641 const struct nlattr *attr, u8 *dreg, 9642 const struct nft_data *data, 9643 enum nft_data_types type, unsigned int len) 9644 { 9645 int err; 9646 u32 reg; 9647 9648 err = nft_parse_register(attr, ®); 9649 if (err < 0) 9650 return err; 9651 9652 err = nft_validate_register_store(ctx, reg, data, type, len); 9653 if (err < 0) 9654 return err; 9655 9656 *dreg = reg; 9657 return 0; 9658 } 9659 EXPORT_SYMBOL_GPL(nft_parse_register_store); 9660 9661 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = { 9662 [NFTA_VERDICT_CODE] = { .type = NLA_U32 }, 9663 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING, 9664 .len = NFT_CHAIN_MAXNAMELEN - 1 }, 9665 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 }, 9666 }; 9667 9668 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data, 9669 struct nft_data_desc *desc, const struct nlattr *nla) 9670 { 9671 u8 genmask = nft_genmask_next(ctx->net); 9672 struct nlattr *tb[NFTA_VERDICT_MAX + 1]; 9673 struct nft_chain *chain; 9674 int err; 9675 9676 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla, 9677 nft_verdict_policy, NULL); 9678 if (err < 0) 9679 return err; 9680 9681 if (!tb[NFTA_VERDICT_CODE]) 9682 return -EINVAL; 9683 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE])); 9684 9685 switch (data->verdict.code) { 9686 default: 9687 switch (data->verdict.code & NF_VERDICT_MASK) { 9688 case NF_ACCEPT: 9689 case NF_DROP: 9690 case NF_QUEUE: 9691 break; 9692 default: 9693 return -EINVAL; 9694 } 9695 fallthrough; 9696 case NFT_CONTINUE: 9697 case NFT_BREAK: 9698 case NFT_RETURN: 9699 break; 9700 case NFT_JUMP: 9701 case NFT_GOTO: 9702 if (tb[NFTA_VERDICT_CHAIN]) { 9703 chain = nft_chain_lookup(ctx->net, ctx->table, 9704 tb[NFTA_VERDICT_CHAIN], 9705 genmask); 9706 } else if (tb[NFTA_VERDICT_CHAIN_ID]) { 9707 chain = nft_chain_lookup_byid(ctx->net, ctx->table, 9708 tb[NFTA_VERDICT_CHAIN_ID]); 9709 if (IS_ERR(chain)) 9710 return PTR_ERR(chain); 9711 } else { 9712 return -EINVAL; 9713 } 9714 9715 if (IS_ERR(chain)) 9716 return PTR_ERR(chain); 9717 if (nft_is_base_chain(chain)) 9718 return -EOPNOTSUPP; 9719 if (nft_chain_is_bound(chain)) 9720 return -EINVAL; 9721 if (desc->flags & NFT_DATA_DESC_SETELEM && 9722 chain->flags & NFT_CHAIN_BINDING) 9723 return -EINVAL; 9724 9725 chain->use++; 9726 data->verdict.chain = chain; 9727 break; 9728 } 9729 9730 desc->len = sizeof(data->verdict); 9731 9732 return 0; 9733 } 9734 9735 static void nft_verdict_uninit(const struct nft_data *data) 9736 { 9737 struct nft_chain *chain; 9738 struct nft_rule *rule; 9739 9740 switch (data->verdict.code) { 9741 case NFT_JUMP: 9742 case NFT_GOTO: 9743 chain = data->verdict.chain; 9744 chain->use--; 9745 9746 if (!nft_chain_is_bound(chain)) 9747 break; 9748 9749 chain->table->use--; 9750 list_for_each_entry(rule, &chain->rules, list) 9751 chain->use--; 9752 9753 nft_chain_del(chain); 9754 break; 9755 } 9756 } 9757 9758 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v) 9759 { 9760 struct nlattr *nest; 9761 9762 nest = nla_nest_start_noflag(skb, type); 9763 if (!nest) 9764 goto nla_put_failure; 9765 9766 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code))) 9767 goto nla_put_failure; 9768 9769 switch (v->code) { 9770 case NFT_JUMP: 9771 case NFT_GOTO: 9772 if (nla_put_string(skb, NFTA_VERDICT_CHAIN, 9773 v->chain->name)) 9774 goto nla_put_failure; 9775 } 9776 nla_nest_end(skb, nest); 9777 return 0; 9778 9779 nla_put_failure: 9780 return -1; 9781 } 9782 9783 static int nft_value_init(const struct nft_ctx *ctx, 9784 struct nft_data *data, struct nft_data_desc *desc, 9785 const struct nlattr *nla) 9786 { 9787 unsigned int len; 9788 9789 len = nla_len(nla); 9790 if (len == 0) 9791 return -EINVAL; 9792 if (len > desc->size) 9793 return -EOVERFLOW; 9794 if (desc->len) { 9795 if (len != desc->len) 9796 return -EINVAL; 9797 } else { 9798 desc->len = len; 9799 } 9800 9801 nla_memcpy(data->data, nla, len); 9802 9803 return 0; 9804 } 9805 9806 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data, 9807 unsigned int len) 9808 { 9809 return nla_put(skb, NFTA_DATA_VALUE, len, data->data); 9810 } 9811 9812 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = { 9813 [NFTA_DATA_VALUE] = { .type = NLA_BINARY }, 9814 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED }, 9815 }; 9816 9817 /** 9818 * nft_data_init - parse nf_tables data netlink attributes 9819 * 9820 * @ctx: context of the expression using the data 9821 * @data: destination struct nft_data 9822 * @desc: data description 9823 * @nla: netlink attribute containing data 9824 * 9825 * Parse the netlink data attributes and initialize a struct nft_data. 9826 * The type and length of data are returned in the data description. 9827 * 9828 * The caller can indicate that it only wants to accept data of type 9829 * NFT_DATA_VALUE by passing NULL for the ctx argument. 9830 */ 9831 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, 9832 struct nft_data_desc *desc, const struct nlattr *nla) 9833 { 9834 struct nlattr *tb[NFTA_DATA_MAX + 1]; 9835 int err; 9836 9837 if (WARN_ON_ONCE(!desc->size)) 9838 return -EINVAL; 9839 9840 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla, 9841 nft_data_policy, NULL); 9842 if (err < 0) 9843 return err; 9844 9845 if (tb[NFTA_DATA_VALUE]) { 9846 if (desc->type != NFT_DATA_VALUE) 9847 return -EINVAL; 9848 9849 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]); 9850 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) { 9851 if (desc->type != NFT_DATA_VERDICT) 9852 return -EINVAL; 9853 9854 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]); 9855 } else { 9856 err = -EINVAL; 9857 } 9858 9859 return err; 9860 } 9861 EXPORT_SYMBOL_GPL(nft_data_init); 9862 9863 /** 9864 * nft_data_release - release a nft_data item 9865 * 9866 * @data: struct nft_data to release 9867 * @type: type of data 9868 * 9869 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded, 9870 * all others need to be released by calling this function. 9871 */ 9872 void nft_data_release(const struct nft_data *data, enum nft_data_types type) 9873 { 9874 if (type < NFT_DATA_VERDICT) 9875 return; 9876 switch (type) { 9877 case NFT_DATA_VERDICT: 9878 return nft_verdict_uninit(data); 9879 default: 9880 WARN_ON(1); 9881 } 9882 } 9883 EXPORT_SYMBOL_GPL(nft_data_release); 9884 9885 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 9886 enum nft_data_types type, unsigned int len) 9887 { 9888 struct nlattr *nest; 9889 int err; 9890 9891 nest = nla_nest_start_noflag(skb, attr); 9892 if (nest == NULL) 9893 return -1; 9894 9895 switch (type) { 9896 case NFT_DATA_VALUE: 9897 err = nft_value_dump(skb, data, len); 9898 break; 9899 case NFT_DATA_VERDICT: 9900 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict); 9901 break; 9902 default: 9903 err = -EINVAL; 9904 WARN_ON(1); 9905 } 9906 9907 nla_nest_end(skb, nest); 9908 return err; 9909 } 9910 EXPORT_SYMBOL_GPL(nft_data_dump); 9911 9912 int __nft_release_basechain(struct nft_ctx *ctx) 9913 { 9914 struct nft_rule *rule, *nr; 9915 9916 if (WARN_ON(!nft_is_base_chain(ctx->chain))) 9917 return 0; 9918 9919 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain); 9920 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) { 9921 list_del(&rule->list); 9922 ctx->chain->use--; 9923 nf_tables_rule_release(ctx, rule); 9924 } 9925 nft_chain_del(ctx->chain); 9926 ctx->table->use--; 9927 nf_tables_chain_destroy(ctx); 9928 9929 return 0; 9930 } 9931 EXPORT_SYMBOL_GPL(__nft_release_basechain); 9932 9933 static void __nft_release_hook(struct net *net, struct nft_table *table) 9934 { 9935 struct nft_flowtable *flowtable; 9936 struct nft_chain *chain; 9937 9938 list_for_each_entry(chain, &table->chains, list) 9939 __nf_tables_unregister_hook(net, table, chain, true); 9940 list_for_each_entry(flowtable, &table->flowtables, list) 9941 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list, 9942 true); 9943 } 9944 9945 static void __nft_release_hooks(struct net *net) 9946 { 9947 struct nftables_pernet *nft_net = nft_pernet(net); 9948 struct nft_table *table; 9949 9950 list_for_each_entry(table, &nft_net->tables, list) { 9951 if (nft_table_has_owner(table)) 9952 continue; 9953 9954 __nft_release_hook(net, table); 9955 } 9956 } 9957 9958 static void __nft_release_table(struct net *net, struct nft_table *table) 9959 { 9960 struct nft_flowtable *flowtable, *nf; 9961 struct nft_chain *chain, *nc; 9962 struct nft_object *obj, *ne; 9963 struct nft_rule *rule, *nr; 9964 struct nft_set *set, *ns; 9965 struct nft_ctx ctx = { 9966 .net = net, 9967 .family = NFPROTO_NETDEV, 9968 }; 9969 9970 ctx.family = table->family; 9971 ctx.table = table; 9972 list_for_each_entry(chain, &table->chains, list) { 9973 ctx.chain = chain; 9974 list_for_each_entry_safe(rule, nr, &chain->rules, list) { 9975 list_del(&rule->list); 9976 chain->use--; 9977 nf_tables_rule_release(&ctx, rule); 9978 } 9979 } 9980 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) { 9981 list_del(&flowtable->list); 9982 table->use--; 9983 nf_tables_flowtable_destroy(flowtable); 9984 } 9985 list_for_each_entry_safe(set, ns, &table->sets, list) { 9986 list_del(&set->list); 9987 table->use--; 9988 nft_set_destroy(&ctx, set); 9989 } 9990 list_for_each_entry_safe(obj, ne, &table->objects, list) { 9991 nft_obj_del(obj); 9992 table->use--; 9993 nft_obj_destroy(&ctx, obj); 9994 } 9995 list_for_each_entry_safe(chain, nc, &table->chains, list) { 9996 ctx.chain = chain; 9997 nft_chain_del(chain); 9998 table->use--; 9999 nf_tables_chain_destroy(&ctx); 10000 } 10001 nf_tables_table_destroy(&ctx); 10002 } 10003 10004 static void __nft_release_tables(struct net *net) 10005 { 10006 struct nftables_pernet *nft_net = nft_pernet(net); 10007 struct nft_table *table, *nt; 10008 10009 list_for_each_entry_safe(table, nt, &nft_net->tables, list) { 10010 if (nft_table_has_owner(table)) 10011 continue; 10012 10013 list_del(&table->list); 10014 10015 __nft_release_table(net, table); 10016 } 10017 } 10018 10019 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event, 10020 void *ptr) 10021 { 10022 struct nft_table *table, *to_delete[8]; 10023 struct nftables_pernet *nft_net; 10024 struct netlink_notify *n = ptr; 10025 struct net *net = n->net; 10026 unsigned int deleted; 10027 bool restart = false; 10028 10029 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER) 10030 return NOTIFY_DONE; 10031 10032 nft_net = nft_pernet(net); 10033 deleted = 0; 10034 mutex_lock(&nft_net->commit_mutex); 10035 if (!list_empty(&nf_tables_destroy_list)) 10036 rcu_barrier(); 10037 again: 10038 list_for_each_entry(table, &nft_net->tables, list) { 10039 if (nft_table_has_owner(table) && 10040 n->portid == table->nlpid) { 10041 __nft_release_hook(net, table); 10042 list_del_rcu(&table->list); 10043 to_delete[deleted++] = table; 10044 if (deleted >= ARRAY_SIZE(to_delete)) 10045 break; 10046 } 10047 } 10048 if (deleted) { 10049 restart = deleted >= ARRAY_SIZE(to_delete); 10050 synchronize_rcu(); 10051 while (deleted) 10052 __nft_release_table(net, to_delete[--deleted]); 10053 10054 if (restart) 10055 goto again; 10056 } 10057 mutex_unlock(&nft_net->commit_mutex); 10058 10059 return NOTIFY_DONE; 10060 } 10061 10062 static struct notifier_block nft_nl_notifier = { 10063 .notifier_call = nft_rcv_nl_event, 10064 }; 10065 10066 static int __net_init nf_tables_init_net(struct net *net) 10067 { 10068 struct nftables_pernet *nft_net = nft_pernet(net); 10069 10070 INIT_LIST_HEAD(&nft_net->tables); 10071 INIT_LIST_HEAD(&nft_net->commit_list); 10072 INIT_LIST_HEAD(&nft_net->module_list); 10073 INIT_LIST_HEAD(&nft_net->notify_list); 10074 mutex_init(&nft_net->commit_mutex); 10075 nft_net->base_seq = 1; 10076 nft_net->validate_state = NFT_VALIDATE_SKIP; 10077 10078 return 0; 10079 } 10080 10081 static void __net_exit nf_tables_pre_exit_net(struct net *net) 10082 { 10083 struct nftables_pernet *nft_net = nft_pernet(net); 10084 10085 mutex_lock(&nft_net->commit_mutex); 10086 __nft_release_hooks(net); 10087 mutex_unlock(&nft_net->commit_mutex); 10088 } 10089 10090 static void __net_exit nf_tables_exit_net(struct net *net) 10091 { 10092 struct nftables_pernet *nft_net = nft_pernet(net); 10093 10094 mutex_lock(&nft_net->commit_mutex); 10095 if (!list_empty(&nft_net->commit_list) || 10096 !list_empty(&nft_net->module_list)) 10097 __nf_tables_abort(net, NFNL_ABORT_NONE); 10098 __nft_release_tables(net); 10099 mutex_unlock(&nft_net->commit_mutex); 10100 WARN_ON_ONCE(!list_empty(&nft_net->tables)); 10101 WARN_ON_ONCE(!list_empty(&nft_net->module_list)); 10102 WARN_ON_ONCE(!list_empty(&nft_net->notify_list)); 10103 } 10104 10105 static struct pernet_operations nf_tables_net_ops = { 10106 .init = nf_tables_init_net, 10107 .pre_exit = nf_tables_pre_exit_net, 10108 .exit = nf_tables_exit_net, 10109 .id = &nf_tables_net_id, 10110 .size = sizeof(struct nftables_pernet), 10111 }; 10112 10113 static int __init nf_tables_module_init(void) 10114 { 10115 int err; 10116 10117 err = register_pernet_subsys(&nf_tables_net_ops); 10118 if (err < 0) 10119 return err; 10120 10121 err = nft_chain_filter_init(); 10122 if (err < 0) 10123 goto err_chain_filter; 10124 10125 err = nf_tables_core_module_init(); 10126 if (err < 0) 10127 goto err_core_module; 10128 10129 err = register_netdevice_notifier(&nf_tables_flowtable_notifier); 10130 if (err < 0) 10131 goto err_netdev_notifier; 10132 10133 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params); 10134 if (err < 0) 10135 goto err_rht_objname; 10136 10137 err = nft_offload_init(); 10138 if (err < 0) 10139 goto err_offload; 10140 10141 err = netlink_register_notifier(&nft_nl_notifier); 10142 if (err < 0) 10143 goto err_netlink_notifier; 10144 10145 /* must be last */ 10146 err = nfnetlink_subsys_register(&nf_tables_subsys); 10147 if (err < 0) 10148 goto err_nfnl_subsys; 10149 10150 nft_chain_route_init(); 10151 10152 return err; 10153 10154 err_nfnl_subsys: 10155 netlink_unregister_notifier(&nft_nl_notifier); 10156 err_netlink_notifier: 10157 nft_offload_exit(); 10158 err_offload: 10159 rhltable_destroy(&nft_objname_ht); 10160 err_rht_objname: 10161 unregister_netdevice_notifier(&nf_tables_flowtable_notifier); 10162 err_netdev_notifier: 10163 nf_tables_core_module_exit(); 10164 err_core_module: 10165 nft_chain_filter_fini(); 10166 err_chain_filter: 10167 unregister_pernet_subsys(&nf_tables_net_ops); 10168 return err; 10169 } 10170 10171 static void __exit nf_tables_module_exit(void) 10172 { 10173 nfnetlink_subsys_unregister(&nf_tables_subsys); 10174 netlink_unregister_notifier(&nft_nl_notifier); 10175 nft_offload_exit(); 10176 unregister_netdevice_notifier(&nf_tables_flowtable_notifier); 10177 nft_chain_filter_fini(); 10178 nft_chain_route_fini(); 10179 unregister_pernet_subsys(&nf_tables_net_ops); 10180 cancel_work_sync(&trans_destroy_work); 10181 rcu_barrier(); 10182 rhltable_destroy(&nft_objname_ht); 10183 nf_tables_core_module_exit(); 10184 } 10185 10186 module_init(nf_tables_module_init); 10187 module_exit(nf_tables_module_exit); 10188 10189 MODULE_LICENSE("GPL"); 10190 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 10191 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES); 10192